TECHNICAL FIELD [0001] The present subject matter relates generally to motor vehicles, and more particularly to a housing accommodating a master control unit mounted to the motor vehicle.
BACKGROUND [0002] Generally, a motor vehicle includes an internal combustion engine and/or an electric motor, which is also referred to as traction motor, that are used for providing motion to the vehicle. Generally, the internal combustion engine is operated or controlled by a purely mechanical system or an electronic system or a combination of both. For example, the IC can be operated by a carburetor that is mechanical in nature or using a fuel injector system that typically requires electronic control. However, the traction motor, which is electrical component, requires control using an electronic master control device. Therefore, either in a hybrid vehicle incorporating an IC engine and a traction motor or in an electric, vehicle incorporating only a traction motor, the master control device plays a crucial role.
BRIEF DESCRIPTION OF THE DRAWINGS [0003] The detailed description of the present subject matter is described with reference to the accompanying figures. Same numbers are used throughout the drawings to reference like features and components.
[0004] Fig. 1 illustrates a left side view of an exemplary vehicle, in accordance with an embodiment of the present subject matter. [0005] Fig. 2 illustrates an isometric view of the housing, in accordance with an embodiment of the subject matter.
[0006] Fig 3 illustrates a partially exploded view of the housing, in accordance with an embodiment of the present subject matter. [0007] Fig. 4 depicts a side view of the chassis of the housing, in accordance with an embodiment of the present subject matter.
[0008] Fig. 5 depicts a front view of a typical electronic component, in accordance with the present subject matter.

[0009] Fig. 6 depicts the electronic component thermally connected to the
cooling bar., in accordance with the embodiment of Fig. 5.
[00010] Fig. 7 depicts an exploded view of the board assembly depicted in
Fig. 6.
[00011] Fig. 8 depicts an isometric view of the elastic member, in accordance
with the embodiment as depicted in Fig. 7.
[00012] Fig. 9 depicts a side view board assembly, in accordance with the
embodiment of Fig. 4.
[00013] Fig. 10 depicts a side of the chassis, in accordance with the
embodiment of Fig. 4.
[00014] Fig. 11 depicts an isometric view of the housing being mounted to a
structural member of the vehicle, in accordance with the embodiment of Fig. 2.
[00015] Fig. 12 depicts a side view of the housing, in accordance with
another embodiment of the present subject matter.
DETAILED DESCRIPTION [00016] Generally, every motor vehicle incorporating an electric motor that acts as one of the prime movers of the vehicle has to be controlled and operated by a master control unit. For example, in case of a hybrid vehicle, the electric . motor and an internal combustion (IC) engine act as prime movers operated depending on requirement by the user. The electric motor and IC engine can be operated independently, at the same time, or one subsequent to another depending on power or mileage requirements by the user. The aforementioned functions are controlled by a master control unit.
[00017] Typically, electric vehicles or hybrid vehicles incorporated with such aforementioned electric motor that act as a prime mover is provided with a high capacity battery or high capacity battery packs for driving the electric motor. The master control unit is capable of converting the voltage from the high capacity battery, which is direct current (DC) voltage, into alternating current (AC) voltage for driving the electric motor that is for example a three phase AC electric motor. The master control unit provides the required speed and torque by ryaryipg-ithe- current-that-i S;being-sent40:the-e leetr^c,:mptor^ThermastertControl-unit-

that acts as an inverter includes plurality of MOSFETs or the like that are used for switching the three phase AC electric motor and for controlling the current flow. Moreover, the master control unit enables charging of battery from the electric motor that is functioning in generation mode during which high currents close to 5-10Amps is generated. Thus, the master control unit operating with the high currents for operating the electric motor and for charging the battery is subject to heating.
[00018] Also, the master control unit receives various signals from the user and also status signals from the various systems of the vehicle to evaluate the operation of the system of the vehicle. For example, the master control unit receives various input signals from user like throttle input, brake input, or ignition input, and various signals from the systems of the vehicle like the position sensor data from electric motor, position sensor of crankshaft, battery state of charge (SoC), or other diagnostic data. Thus, the master control unit takes critical input signals from the.user and the vehicle for reliable operation of the vehicle. Moreover, the master control unit includes a DC to DC converter unit for operating the vehicle loads, that operate at lower voltage compared to the electric motor operating as prime mover. Further, the master control unit also controls the ignition control in vehicles incorporating the IC engine. Also, the master control unit performs additional operations like the signal conditioning, communicating with the digital console, communicating with safety system like ABS, and communicating with the communication systems like GPS. Therefore, the master -control circuit acts as brain for the motor vehicle for controlling over all operation of the vehicle.
[00019] Therefore, such a master control unit is a very essential system of the
vehicle that is to be securely and reliably accommodated in the motor vehicle.
Especially, in securely and reliable accommodating such master control unit in a
two-wheeled or a three-wheeled vehicle is challenge as the vehicle is compact
and is having an exposed layout when compared to a four-wheeled vehicle.
Therefore, the master control unit should be securely packaged to avoid entry of
-iwatefror-mQisftire.vMoreaver.-me-mast^ currents

that are carried by thick current carrying cables that are to be securely connected to avoid any short circuits or un-safe incidents like fire. Moreover, such master control unit employed in a vehicle is subject to vibrations during operation of the vehicle that could affect mounting of the master control unit and could result in loosening or part failure. Additional challenge being, the weight of the master control unit/casing is to be reduced so as to reduce the own weight of the unit to improve secure mounting thereof.
[00020] Additionally, the conventional casings include a split type main enclosure, wherein the split parts are made probably of casting. Further, the MOSFETs of the master control unit that requires connection with the casing for heat transfer have to be mounted with 90 degree bent on their legs so that they can be secured to either of the split pieces by screw/ bolt. However, such an assembly complicates the assembly and disassembly as the master control unit may include a printed circuit board mounted to one split part and the MOSFET is in-thermal communication with another part. Moreover, juch an assembly does not provide efficient heat transfer as the manufacturing tolerances between the split parts may result in gaps thereby reducing cooling or there may be interference between the components that could result in early part failure. For example, three can be pressure applied on the MOSFET that is mounted with the legs bent, whereby the breakage can occur at the bent portion of the leg as the vibrations form the vehicle also get transferred to the master control unit. If the MOSFET fails, it would stall the vehicle leaving the user stranded thereby affecting reliable functioning of the system and the vehicle. Moreover, accommodation of complex master control devices that includes more than one PCB is also complex in conventional design.
[00021] Hence, the present subject matter is aimed at addressing the aforementioned and other problems in the prior art. Thus, it is an object of the present subject matter to provide housing for the master control unit that is securely accommodated therein and is securely mounted to the motor vehicle. Further, the master control unit should be reliable for functioning of the vehicle.

[00022] It is an aspect of the present subject matter that the housing includes a chassis and one or more covers that cover the openings provided on the chassis.-Preferably, the chassis is made of a rigid material and at the same times is thermally conducting. In a preferred implementation, the chassis is made majorly of Aluminium (At). The chassis is extruded, which is easier to manufacture compared to casting. At the same time the extruded chassis is a single piece that is rigid and is capable of optimally dissipate heat and accommodates the master control circuit.
[00023] It is another aspect that the chassis includes a base portion and fin portion. The fin portion extends to the sides excluding base portion. In other words, the fin portion extends to the sides of the chassis excluding the side forming the base portion. The base portion extends beyond the width of the chassis to provide mounting apertures thereon for securing the housing rigidly to the structural member of the vehicle. For example, in a chassis with a rectangular cross-section, the fins for cooling are provided on three sides and the fins extend about the length of the chassis.
[00024] . The covers of the housing provide a tight seal that is capable of securely accommodating the master control unit therein and restrict entry of dust, water, moist or the like.
[00025] It is another aspect that the chassis includes a hollow region with opening on at least one side. In a preferred implementation, the opening is provided on either side that is opposite to each other. The master control unit is an electronic unit that includes plurality of printed circuit board(s) (PCB) that support semiconductor/electronic components like Metal oxide semiconductor field effect transistors (MOSFETs), Bipolar junction transistors (BJTs), or other semiconductor and electrical/electronic components.
[00026] The printed circuit board(s) are collectively referred to as board assembly. The board assembly is slidably mounted to the hollow region of the chassis, wherein the board assembly is rigidly secured and annularly covered. Further, the board assembly includes connectors extending outward from the housing, preferably from the covers of thehousing-Jo_enable-connection-of-

electrical wires/ports. It is an advantage that the connection wires/ports are also tightly sealed by the covers that are preferably made of polymer material. [00027] The chassis includes plurality of slots that are symmetrically provided on the internal side thereof and the slots extend along the direction of reception of the board assembly. It is an advantage that the slots are also formed by extrusion and does not require any additional tooling or any mountings points. [00028] It is a feature of the present subject matter that the chassis can accommodate more than one PCB of the board assembly. The PCBs are physically connected through spacer(s) that separate the PCBs and at the same time provide structural support. It is a feature that the spacers are mounted to the PCBs only and does not require any mounting onto the chassis keeping the assembly devoid of fastening on the chassis. This eliminates any additional mounting or fastening of the board assembly to the chassis thereby enabling ease of assembly and removal.
[00029] It is another feature that at least one PCB is provided with electronic components like MOSFETs that are soldered thereof. The element 'MOSFET' is not limiting and includes any other relevant electrical/electronic component. Preferably, the semiconductor components are disposed on a side of the board that is facing away from the adjacent chassis side. For example,in case of a board assembly with two board(s), the electronic components are disposed on a first board and the electronic components body is disposed between the first board and the second board thereby keeping the board assembly compact. The semiconductor components are soldiered at the pads of the slots and the pads provide a trace path that provides electrical contact.
[00030] - It is another feature that the electronic components are thermally connected to cooling bar that extend along at least a portion of the housing. The electronic components are secured to the board by soldering the legs and a heat sink connecting portion of the electronic component is abuttingly secured to the -cooling bar. The cooling bar is a solid metallic bar that is made of thermally conducting material and the cooling bar is having a thermal conductivity higher than one or morebpardsof the board assembly. .In, .me^implemejntation,_the.

cooling bar is extending along the length of the chassis or along the long axis of the chassis, wherein the plurality of electronic components is disposed abuttingly to the cooling bar. It is an advantage that the electronic components that operate in conjunction with the high current carrying traction motor or magneto is effectively cooled. In an embodiment, the vehicle is provided with cooling fins that direct air towards the housing for cooling.
[00031] The cooling bar is provided with groove(s) in proximity to the side abutting with the electronic component, wherein an clastic member is provided to secure the electronic component to the cooling bar through the groove. In one implementation, the elastic member is slidable mounted on to the electronic component body and into the groove of the cooling bar. The elastic member holds the electronic component to the cooling bar providing positive pressure on the electronic component keeping the heat sink connecting portion of the electronic component to be in full contact with the cooling bar. It is an advantage that the elastic member enables ease of securing of the electronic components to -the cooling bar thereby eliminating additional time taking fastening process. It is a feature that the board assembly includes electronic components secured thereto and the cooling bars are also secured to the board assembly. It is an advantage that the present subject matter enables straight mounting of the electronic components thereby eliminating the need for bending and also failures associated to bending of the components.
[00032] It is a feature that the present subject matter eliminates fasteners or the like for mounting the master control unit to the housing. Also, the semiconductor components secured are thermally coupled to the chassis through the cooling bars, wherein the cooling bar is securely and rigidly connected to the chassis and to the semiconductor component without the need.for fastening. Therefore, it is an advantage that fasteners for mounting the master control unit is eliminated thereby improving ease of assembly and also assembly time. [00033] It is another feature that at least two board(s) of the board assembly is deposed in horizontal plane/ parallel to each other to enable slidable mounting. The boards are connected using spacers and the electronic comDonents are

disposed on at least one board, are facing inward. It is an advantage that the electronic components and other components are disposed with their body accommodated at the gap between the boards. The cooling bars are also disposed at gap between the board(s) and the cooling bars are preferably disposed towards the end portions to enable contact with the sides of the chassis. Thus, the board assembly is compactly packaged so that is can be accommodated in a compact housing.
[00034] . It is a feature that the side of the cooling bar that is facing and engaging with the chassis is provided with a locking portion with first cross-section. Similarly, the inner side/face of the chassis that comes in contact with the cooling bar of the board assembly is provided with a receiving portion with the second cross-section that complements the first cross-section of the cooling bar to enable engagement therebetween. It is an advantage that the board assembly is slidably inserted into the chassis, wherein the board(s) is slid into the slots and at the same time the cooling bars get engaged with the sides of the chassis thereby bringing the semiconductor components in thermal contact with the chassis. Therefore, the board(s) having a low thermal conductivity and the cooling bars having high thermal conductivity are slidably mounted to the chassis. Moreover, the board assembly is secured to the chassis by the boards being mounted to the slots/groove and the cooling bars secured to the electronic components are also secured to the chassis whereby the cooling bar and the boards slide about the chassis.
[00035] It is a feature that the chassis is provided with fins disposed on-one or more sides of the chassis. In one implementation, the chassis is provided with fins all sides expect the base portion. In one implementation, the fins include a first set of fins and a second set of fins. The first set of fins are provided in proximity to the contact region of the chassis with the cooling bar and are substantially longer with respect to the second set of fins that are disposed away from the contact region of the chassis with the cooling bar. In other words, the first set of fins are having a depth substantially greater than a depth of the second set of fins.

Therefore, the fins are provided with regular pattern but with irregular length/depth.
[00036] It is a feature of the present subject matter that the chassis includes an inward step portion provide on at least one side thereof. The first set of fins having a depth greater than the depth of the second set of fins are disposed at the inward step portion.
[00037] It is a feature that the chassis is provided with series of inward and outward bends. The inward and the outward bends provide a corrugated profile whereby the chassis attains structural rigidity to withstand the-vibrations and other impacts acting thereon during operation of the vehicle. Thus, the housing forms a rigid member that securely accommodates the master control unit formed by the circuit board(s) assembly. Also, at least one mounting aperture is disposed adjacent to the inward or outward bend.
[00038] It is yet another feature that the base portion of the chassis is provided with an exterior engaging slot that extends along at least a portion of the chassis. The external engaging slot enables the mounting of the housing to the structural member of the vehicle, wherein the structural member includes a receiving portion for slidably mounting the housing thereat. Also, at least a fastener is provided to restrict the movement of the housing about the receding portion that is preferably provided on a bracket welded or fastened to the structural member of the vehicle. Further, the external engaging portion can be used to carry the housing by providing a handle engaging disposed thereat. [00039] The aforesaid and other advantages of the present subject matter would be described in greater detail in conjunction with the figures in the following description.
[00040] Fig. 1 illustrates a left side view of an exemplary motor vehicle 100, in accordance with an embodiment of the present subject matter. The vehicle 100 illustrated, has a structural member 105. In the present embodiment, the structural member is a step-through type structural memberl05 that includes a head tube 105A, and a main frame 105B that extend rearwardly downward from an anterior

portion of the head tube 105A. The main frame 105B extends inclinedly rearward
to a rear portion of the vehicle 100.
[00041] The vehicle 100 includes an internal combustion engine 115 that is
connected to the structural member 105. In the present implementation, the
engine 115 is mounted on a swing arm 135, which is swingably connected to the
main frame 105B using a toggle link. The vehicle 100 also includes a traction
motor 120, which is another prime mover. In a preferred embodiment, the
traction motor 120 is hub mounted to a rear wheel 125. A front wheel 110 is
rotatably supported by the structural member 105. The front wheel 110 is
connected to a handle bar assembly 130 that enables maneuvering of the vehicle
100.
[00042] The vehicle 100 includes a high capacity on-board battery (not
shown) drives the traction motor 120. The high capacity battery can be disposed
at a front portion or a rear portion of the vehicle 100. The high capacity battery is
supported by the structural member 105 and the vehicle 100 includes plurality of
body panels, mounted to the structural member and covering various components
of the vehicle 100. The plurality of panels includes a front panel 140A, a leg
shield 140B, an under-seat cover HOC, and a left and a right side panel 140D. A
glove box may be mounted to a leg shield HOB.
[00043] A floorboard 145 is provided at the step-through portion defmed by
the main tube 105B. A seat assembly 150 is disposed rearward to the see-through
portion and is mounted to the main frame 105B. One or more suspension(s)
connect the wheels 110, 125 to the vehicle 100 and provide comfortable ride. The
vehicle 100 comprises of plurality of electrical and electronic components
including a headlight 155A, a taillight 155B, a starter motor (not shown), a horn
etc. Also, the vehicle 100 includes a master control unit disposed in a housing
200 that is preferably mounted to the structural member 105.
[00044] Fig. 2 depicts a perspective view of the housing for the master
control unit, in accordance with an embodiment of the present subject matter. The
housing 200 includes a chassis 205 and one or more covers 210, 215. The chassis
205 is made of a rigid material including_me.tal-In,the-present-implementation,

the chassis 205 is made of Aluminium (Al) or an alloy with Aluminium being the major element and is preferably extruded part, which is easier to manufacture compared to casting. The covers 210, 215 are capable of sealing the open portions of the chassis 205 through multiple fasteners 220. The covers 210, 215 are adapted to accommodate cable mounting portions.
[00045] In the depicted embodiment, the chassis 205 includes a base portion 205B and fin portion 205F. The fin portion 205F extends to the sides excluding base portion 205B. In other words, the fin portion 205F extends to three sides of the chassis 205 that includes four sides with the base portion 205B forming the fourth side. The base portion 205B protrudes outward and is provided with fastening apertures 221 for securing the housing 200 to the structural member ■ 105 of the vehicle 100. The housing 200 is capable of securely accommodating the master control unit 225- (shown in Fig. 3) therein and restrict entry of dust, water, moist or the like.
[00046] Fig. 3 depicts a perspective view of the chassis being mounted with the master control unit, in accordance with the embodiment of Fig. 2. The chassis 205 in the present implementation has a hollow region 205H with opening on either side. The master control unit 225 is an electronic unit that includes plurality of printed circuit board(s) (PCB) 230A, 230B that support switching electronic components 235 like Metal oxide semiconductor field effect transistors (MOSFETs), Bipolar junction transistors (BJTs), or other semiconductor components and the PCBs are chosen to have low thermal conductivity. The printed circuit board(s) 230A, 230B are collectively referred to as board assembly 230. The board assembly 230 includes connectors 232 extending outward from the housing 200 to enable connection of electrical wires/ports. The board assembly 230 is slidably mountable to the chassis 205. The chassis 205 is provided with plurality of slots 205G (shown in Fig. 10) that are symmetrically provided on the internal side and orthogonal to the direction of reception of the board assembly 230.
[00047] Fig. 4 depicts another view of the chassis along with the board
assembly /master conttr$l_lurjit.mounted,^£

includes a first board 230A and a second board 230B that are physically connected to each other through a spacer 255 that connects each other and at the same time provides sufficient clearance to maintain sufficient gap therebetween. The second board 230B is provided with plurality of electronic components 235 that are soldered thereof. The electronic components 235 electronic component 235 (as depicted in Fig. 5) includes a body 235B, contact legs 235L - Source, Drain, and Gate, and a heat sink connecting portion 23 5C. The electronic component 235 is soldered to the second board 230B by passing the legs 235L through pads (not shown) provided on the board 230B. The pads provide through holes for mounting the components likes MOSFETs and also includes electrical contact. The various pads are connected to each other in a defined pattern through traces provided on the board(s) 230A/230B to establish electrical connection between the components. Further, the heat sink connecting portion 235C of the electronic component 235 is connected to a cooling bar 240 (shown in Fig. 6) that connects all the electronic components thermally. Further, an elastic member 250 - -is used to secure the cooling bar 240 and the electronic component 235, wherein the cooling bar 240 is made of a high thermal conductivity with respect to the board/PCB.
[00048J Fig. 6 depicts an electronic component thermally connected to the
cooling bar and Fig. 7 depicts an exploded view of the electronic component
being connected to the cooling bar, in accordance with the embodiment of Fig. 6.
The electronic component 235 is abuttingly disposed against the cooling bar 240
with the heat sink connecting portion 235C of the electronic component 235
being in contact with face of the cooling bar 240. Further, the cooling bar 240 is
extending along the length of the chassis 205 and is provided with a groove(s)
240G. The groove(s) 240G are provided on a side of the cooling bar 240 such
that the groove extends parallel to the body of the electronic component 235.
Furthermore, an elastic member 250 is used to secure the electronic component
235 to the cooling bar 240. The elastic member 250 includes a U-shaped profile
with the ends 250A, 250B of the elastic member 250 bent inwards. The elastic
-n^mte^2^0-iSrSlidable*raountedrGnitorthe-jel^ —

cooling bar 240 so that the one end 250B of the elastic member 250 enters the groove 240G and the other end 250A of the elastic member abuts the body 235B of the electronic component 235. Therefore, the elastic member 250 enables ease of assembly of securing the electronic component 235 or the like to the cooling bars 240 and also eliminates use of fasteners for securing the electronic component 235 to cooling bars 240 thereby improving ease of assembly. Further, the need for torque adjustment to rigidly secure the electronic component 235 to the cooling bar 240 is also avoided. Therefore, reliability is improved as the fastening of the electronic component 235 through fasteners may result in damage of the component in case of excess torque being applied. Fig. 8 depicts an isometric view of the elastic member 250 in accordance with the embodiment of the present subject matter.
[000491 The elastic member 250 includes the first end 250Band the second end 250A. The first end 250A that abuts one of sides of the groove 240G is provided with a notch 250N. The notch 250N enables the first end of the elastic member 250A to be fully in contact with" the inner side~of thlf groove 240G. In one implementation, the elastic members 250 like clips are pressed vertically down and the notch 250N goes into groove 240G of the cooling bar 240. Further, the notch 250N along with the groove 240G enables the elastic member 250 to maintain full straight contact. Further, the inwardly curved elastic member 250 applies positive load over the electronic components 235 all time to maintain in the desired position. Further, the individual Electronic components 235 can be pulled out in case any failure using a vertical pulling tool without damaging other components in the assembly. Also, number of associated components is reduced. [00050] Fig. 9 depicts the board assembly 230 being mounted with plurality of electronic components. Fig. 10 depicts chassis 205 capable of slidably receiving the board assembly as depicted in Fig. 9. The first board 230A and the second board 230B are connected to each other through spacers 255 that are provided between the board(s) 230A, 230B. The spacers 255 are elongated cylindrical members preferably made of a non-conducting material including any known polymer. The ends of the spacers 255 are internally threaded to enable

fastening of the circuit board(s) 230A, 230B to the spacers 255 using bolts or screws. Further, in the depicted embodiment, the electronic components 235 are placed inwards with the legs 235L of the electronic components 235 extending outward. The. electronic components 235 are soldered to the pads provided on the first board 230A and are spaced apart. Further, the electronic components 235 are thermally connected through a first cooling bar 240A that thermally connects all the electronic components 235 disposed on one side and a second cooling bar 240 thermally connects the electronic components 235 disposed on other side. [00051] In one embodiment, as depicted in Fig. 10, the chassis 205 includes an inward step portion 273 provided on at least one side of the chassis 205, wherein the first set of fins 260A disposed at the inward step portion 273 whereby the first set of fins 260A having fins with greater depth compared to the second set of fins 260B are accommodated on the outer periphery of the chassis 205 with the first set of fins 260A not protruding outward compared to second set offins260B.
[00052] The housing 200 is provided with at least two inward bend(s) 270 in width direction, which is the direction parallel to a plane of at least one board of the master control assembly 230. Further, at least one inward step portion 273 is provided in a height direction that is orthogonal to the width direction. [00053] The cooling bars 240 have one side 240S1 in contact with the Electronic components 235 like MOSFETs and another side 240S2 of the cooling bar 240 is facing outward. Another side 240S2 of the cooling bar 240 is having a locking portion 240S2 with a first cross-section CS1. The inward side IS of the chassis 205 that is facing the cooling bar 240 is provided a receiving portion 205R having a second cross-section CS2 that complements the first cross-section CS1 of the cooling bar 240 to enable engagement therebetween. In the present implementation, the locking portion 240S2 with the first cross-section CS1 is a dove-tail cross-section provided on the cooling bar 240 and the receiving portion 205R with the second cross-section CS2 is a negative dove-tail cross-section that is capable of receiving the first cross-section CS1 of the cooling bar 240. The cooling bars 240 that are in thermal contact with the electronic components 235,

with support from elastic member 250, keeps the electronic component firmly against cooling bars 240 and thus maintaining surface to surface contact always therebetween. Also, the receiving portion 205R is provided at a substantial center on the side of the chassis 205, wherein said receiving portion 205R receives the heat from electronic components by conduction enables spreading of heat about the surface of the chassis 205 that is dissipated by convection. The fin portion 260 of the present subject matter offers, improved thermal efficiency due to the
fin profile.
[00054] Further, the chassis 205 is provided with elongated grooves/slots
205G provided along the direction of sliding of the board assembly 230. The
elongated grooves 205G are provided to receive the board assembly 230 slidably.
In the present implementation, two pairs of elongated grooves 205G are provided
to receive the first board 230A and the second board 230B thereat. Also, the
cooling bar 240 is connected to chassis 205 through interlocking. The board
assembly 230 during assembly with the chassis 205, makes the cooling bars 240
to be aligned with the-second cross-section CS2 provided on-the-chassis 205 _ _ (
whereby the cooling bars 240 gets slidably mounted to the chassis 205. This
brings the electronic components 235 in thermal contact with the chassis 205 that'
includes plurality of fins 260 provided on the fm portion 205F. Thus, the
electronic components 235 and other heat dissipating components securely placed
inside the housing 200 are in contact with the thermally conductive exposed parts
like the chassis 205 that are provided with fins 260 disposed on three sides
thereof. Therefore, the heat generated at the electronic component 235 is
effectively transferred to the chassis 205 portion through the cooling bars 240.
Also, gap between the cooling bar 240 and the chassis 205, at the contact portion,
is filled with thermally conductive paste 205T (shown in Fig. 4) thus ensuring the
heat is effectively transferred to the chassis. The area of cross-section of the
receiving portion 205R is substantially greater than the slot 205G as the cooling
bar(s) 240 require higher contact area for heat dissipation.
[00055] Further, the siidable mounting of the board assembly 230 onto the
chassis enables ease of assembly and removal of the master control unit. Further,

the movement of the board assembly 230 is secured on either side by the covers 210, 215 that are fastened to the chassis 205 through mounting holes 265. [00056] Further, the chassis 205 is provided with fins 260 including a first set of fins 260A and a second set of fins 260B. The first set of fins 260A provided in proximity to the contact region of the chassis with the cooling bar 240 are substantially inward or longer with respect to the second set of fins 260B disposed away from the contact region of the chassis 205 with the cooling bar 240. In other words, the first set of fins 260A are provided on at least a portion of an outer surface of the fin portion 250F and the first set of fins 260Aare provided in proximity to a first contact portion being a contact region of the cooling bar 240 with the chassis 205. Thus, the first set of fins 260A provides effective heat dissipation due to longer fin length or depth. Furthermore, the chassis 250 is provided with plurality of mounting holes 265 provided at the receiving end of the covers 210, 215 to secure the covers thereat. In one preferred implementation, the chassis 205 is provided with at least 15 fins are kept on the side of the chassis 205 that is directly in-contact with the cooling bar 240. Further, aLleast 2Lfins... are provided on a side that is not in direct contact with the cooling bar 240. Furthermore, in one embodiment, the fins 260 provided on the side of the chassis 205 includes fins 260A that are directly in contact with the cooling bar 240 and the fins 260B are indirectly in contact with the cooling bar 240 with the ratio between the fins 260A directly in contact and the fins 260B indirectly in contact in the range of 1 to 2. This indicates the fins 260A directly in contact are substantially equal or greater than the fins 260B indirectly in contact thereby providing optimum cooling.
[00057] Further, the chassis 205 of the housing 200 is provided with series of inward and outward bends 270 that enable the chassis to have a corrugated profile whereby it enables achieving the chassis 205 structural rigidity to withstand the vibrations and other impacts acting thereon. Furthermore, the chassis 205 includes an exterior engaging slot 205E that extends along at least a portion of the chassis 205. In the present implementation, the engaging slot 205E extends along the length of the chassis 205 and is provided a locking couple with

engaging cross-section that includes a dove-tail section, a T-section, or any other section that enables slidable mounting. The locking couple is required to provide to achieve optimum contact area for heat transfer. Fig. 11 depicts a perspective view of the housing 200 being mounted to a structural member of the vehicle 100. Generally, the engaging slot 205E is provided on the base portion 205B and the engaging slot 205E portion includes a thickness greater than the thickness of rest of the base portion 205B, wherein the engaging slot 205E that forms the portion for mounting to the structural member 105 of the vehicle 100 is made rigid. Further, a mounting bracket 275 is either affixed or welded to the structural member 105 of the vehicle 100. The mounting bracket 275 is provided with a ridge 280 that is capable of receiving the engaging slot 205E of the chassis. The ridge 280 includes a cross-section that enables engagement of the ridge 280 with the engaging slot 275. Therefore, the housing 200 of the present subject matter enables the housing 200 to be easily mounted on to the vehicle 100 by sliding. Further, to lock movement of the housing 200 in the sliding direction, at a desired location, the chassis 205 is fastened through the fastening apertures 221 provided on the base portion 205B. The mounting bracket 275 includes additional arms 275A, 275B that are independently provided or integrated thereof. The additional arms 275A is provided with mounting holes 275AH that are aligned with the fastening apertures 221 provided on the base portion of the chassis 205. The housing 200 can be mounted on the vehicle 100 by sliding and then securing through just one fastener. However, for rigid mounting more than one fastening apertures 221 are provided on the base portion 205B.
[00058] Fig. 12 depicts a side view of a housing 201, in accordance with another embodiment of the present subject matter. A chassis 206 of the housing 201 is at least partially covering a master control assembly (not shown) disposed therein. Further, the chassis includes at least one opening (not shown) covered by at least one cover 210. Further, a mounting bracket 276, which may be either affixed or welded to a structural member 105 of the vehicle 100 supports the housing 201. The mounting bracket 276 is having a U-shaped profile in the current embodiment. The mounting bracket 276 is provided with one or more

ridge(s) 280, 281 that are capable of engaging with one or more engaging slot(s) 205E corresponding to chassis 206. The ridge(s) 280, 281 may have a cross-section that enables the engaging slots 205E to lockingly engage. Further, to lock movement of the housing 201 in the sliding direction, and to position it at a desired location, the chassis 206 is fastened to the mounting bracket 276. Plurality of fins 261 are provided on an outer periphery of the chassis 206 at selective portions.
[00059] Many modifications and variations of the present subject matter are possible in die light of claims herein. It is to be understood that the aspects of the embodiments are not necessarily limited to the features described herein.

List of reference signs:
100 vehicle 30 230B second board
105 structural member 232 connector
105 A head tube 235 electronic component
105B main frame 235B body
115 internal combustion 235C heat sink connecting
engine 35 portion
135 swing ami 235L legs
120 - traction motor 240 cooling bar
125 rear wheel 240G groove
130 handle bar assembly 240S1 one side
140A front panel 40 240S2 . second side
HOB leg shield 250 elastic member
HOC under-seat cover 250A first end
HOD side panel 250B second end
200 housing 250N notch
205/206 chassis 45 255 spacers
205B base portion 260 plurality of fins
205E engaging slot 260A first set of fins
205F fin portion 260B second set of fins
205H hollow region 265 mounting holes
205G slot 50 270 inward bend
205R receiving portion 273 inward step portion
210/215 cover 275/276 mounting bracket
220 fastener 275A additional arm
221 fastening apertures 275 AH . mounting holes
225 master control unit 55 280/281 ridge
230 board assembly CS1 first cross-section
230A first board CS2 second cross-section

' We claim:
1. A housing (200, 201) for mounting to a motor vehicle (100), said housing
(200, 201) comprising:
a chassis (205, 206) capable of supporting a master control unit (225), said chassis (205, 206) capable of covering at least a portion of said master control unit (225), said master control unit (225) includes a board assembly (230) formed by one or more board(s) (230A, 230B), said one or more board(s) (230A, 230B) capable of supporting one or more electronic component(s) (235) thereon, said one or more electronic component(s) (235) disposed in thermal contact with one or more cooling bar(s) (240), said one or more cooling bar(s) (240) having a thermal-conductivity greater than a thermal-conductivity of said one or more board(s) (230A, 230B), and said chassis (205, 206) is capable of supporting said master control unit (225) being slidably mounted thereto through at least one of said one or more board(s) (230A, 230B) and through at least one of said cooling bar(s) (240).
2. The housing (200, 201) for mounting to the motor vehicle (100) as claimed in claim 1, wherein said chassis (205, 206) includes a base portion (205B) and a fin portion (205F), said housing (200, 201) is mounted to said motor vehicle (100) through said base portion (205B), and base portion (205B) along with said fin portion (205F) cover at least a portion of said master control unit (225) , and said fin portion (205F) comprising of a plurality of fins (260) being provided on at least a portion of an outer surface of said fin portion (250F) and said plurality of fins (260) extending along at least a length of said chassis (205, 206).
3. The housing (200, 201) for mounting to the motor vehicle (100) as claimed in claim 2, wherein said plurality of fins (260) includes a first set of fins (260A) and a second set of fins (260B), said first set of fins (260A) are provided in proximity to a first contact portion being a contact region of the cooling bar (240) with the chassis (205, 206), and said second set of fins (260B) being disposed

away from said first contact portion, and said first set of fins (260A) having a depth substantially greater than a depth of the second set of fins (260B).
4. The housing (200, 201) for mounting to the motor vehicle (100) as claimed
in claim 1, wherein said chassis (205, 206) includes plurality of slot(s) (205G)
and one or more receiving portion(s) (205R) extending along a direction of ■
reception of said master control unit (225) , said plurality of slot(s) (205G)
includes a first set substantially oppositely disposed to receive at least one board
. of said one or more, board(s) (230A, 230B) to support thereat, and said receiving portion(s) (205R) being provided with a-cross-sectional area greater than a cross-sectional area of said slot(s) (205G).
5. The housing (200, 201) for mounting to a motor vehicle (100) as claimed in
claim 1, wherein said chassis (205, 206) includes at least one opening for slidably
■ mounting said master control unit (225) therethrough, wherein said at least one opening is securely covered by at least one cover (210, 215) fastened thereto, and said master control unit (225) includes one or more connecting port(s) (231, 232) selectively disposed and extending at least partially through the at least one cover (210, 215) to enable electrical connection with one or more electrical components disposed external to said master control unit (225) .
6. The housing (200, 201) for mounting to a motor vehicle (100) as claimed in claim 1, wherein said one or more electronic component(s) (235) are mounted to^ at least one board of said one or more board(s) (230A, 230B), and said cooling bar(s) (240) are being thermally coupled to said electronic component(s)"(235) to be in thermal contact therewith, and at least one elastic member(s) (250) slidably mountable to hold said cooling bar (240) and said electronic component(s) (235) by application of positive pressure.
7. The housing (200, 201) for mounting to the motor vehicle (100) as claimed in claim 4, wherein said one or more receiving portion(s) (205R) are disposed substantially at a center on at least one side of said chassis (205, 206) and said plurality of slot(s) (205G) being disposed at an offset from said center on at least one side of said, chassis (205, 206) whereby sufficient space being provided for accommodation of said electronic component(s) (235).

8. The housing (200, 201) for mounting to the motor vehicle (100) as claimed in claim 2, wherein said base portion (205B) includes at least one engaging portion (205E) provided on at least one outer periphery thereof for slidably mounting said housing (200, 201) to a mounting bracket (275, 276), said mounting bracket (275, 276) secured to a structural member (105) of said motor vehicle (100), and wherein at least a portion of said base portion (205B) is extending outward beyond a width of rest of said chassis (205, 206).
9. The housing (200, 201) for mounting to the motor vehicle (100) as claimed in claim 8, wherein said chassis (205, 206) said base portion (205B) includes fastening aperture(s) (221) for securing movement of said housing (200, 201) about said mounting bracket (275, 276) through at least one fastening means.
10. The housing (200, 201) for mounting to the motor vehicle (100) as claimed in claim 1 or 3, wherein said chassis (205, 206) includes an inward step portion (273) and said first set of fins (260A) having a depth substantially greater than a depth of the second set of fins (260B) are disposed substantially at said inward step portion (273).
11. The housing (200, 201) for mounting to the motor vehicle (100) as claimed in claim 4, wherein said plurality of slot(s) (205G) includes at least one slot provided with a U-shaped profile, said U-shaped profile having an.opening to receive at least one board thereat, and said one or more receiving portion(s) (205R) includes at least one receiving portion(s) (205R) provided with a dove-tail cross-section to lockingly support said cooling bar (240) thereat.
12. The housing (200, 201) for mounting to the motor vehicle (100) as claimed in claim 3, wherein said first set of fins (260A) disposed directly in contact with the cooling bar (240) are at least equal to or greater than number of fins of the second set of fins (260B) disposed away from the cooling bar (240), wherein a ratio of number of fins of said first set of fins (260A) to number of fins of said second set of fins (260B) is in the range of 1 to 2.
13. The housing (200, 201) for mounting to the motor vehicle (100) as claimed in claim 1, wherein said chassis (205, 206) includes one or more inward bend(s) (270).

14. The housing (200, 201) for mounting to the motor vehicle (100) as claimed in claim 13, wherein said chassis (205) is provided with at least two of said inward bend(s) (270) in width direction and at least one of an inward step portion (273) in a height direction.