Claims:We claim,

1. An improved temperature sensing assembly comprising of a temperature sensor module (102), a silicon varnished sleeve (104) and a coupler (106),
characterized in that,
the temperature sensor module (102) comprises of a brass outer body (108), an insert moulded part(110) and a sleeve moulded part (126), with NTC thermistor(113) arranged with the temperature sensor bulb (114), NTC leads (116) and cable strands of the harness cable or wire (134) inside the brass body (108), a button/wire holding assembly (124) covered by the insert moulded part (110) and a partition (120); and
the insert moulded assembly (128) comprises of the insert moulded part (110), the temperature sensor bulb (114) of the NTC thermistor (113) with the NTC leads(116) crimped to the harness wires (134) at the crimping joints (136) and a tube (118) that is inserted over the crimp joints (136) that plays the role of guards or shield over crimp joints against the Injection Moulding Pressure; and
the button/wire holding assembly (124) holds the harness wires (134) and protects NTC leads (116) and Crimp joints (136) from any external impact and the Partition assembly (120) is present between the two NTC leads (116) of the NTC thermistor (113) to keep the leads (116) separate from each other to prevent their contact with each other.

2. The assembly as claimed in claim 1, wherein the Button/ wire holding assembly (124) is present at the distal end of the temperature sensor module (102) and is used to guide the cable of wiring harness (134) correctly.

3. The assembly as claimed in claim 1, wherein the button/wire holding assembly (124) comprises of two slots (140) to lock and guide the partition, slots (142) for guiding wires on both sides, two holes (144) on opposite sides to hold the assembly in the mould, and two projections (138) at the lower end of the button assembly (124) to hold the silicon varnished sleeve (104) for insert moulding and an elongated slot (104) at the lower end of this assembly for wire guides on both the sides.

4. The assembly as claimed in claim 1, wherein the partition assembly (120) comprises of a flat tapered profile (148) that acts as the partition between two crimp joints (136) and two grooves (150) on the opposite sides to rest and lock in the button slot and a lock stopper (152) to lock the rotational movement of the partition (120).

5. The assembly as claimed in claim 1, wherein the process of insert moulding assembly is carried out by the following steps:
a. harness wires are routed into the button assembly (124) and the heat shrink sleeve (126) is inserted followed by the crimping process with the NTC leads (116) with the help of a splice crimping machine;
b. resistance welding is carried out at the crimping joints (136) to homogenise the NTC leads (116) , harness wires (134) and the crimp material;
c. sleeve heating done to shrink the sleeve (126) over the crimping joints (136) with the help of an IR (infrared) gun with controlled heat and time;
d. the partition (120) is inserted between crimped joints (136) portions and guided in the button assembly (124);
d. tube (118) is then inserted to protect the crimping assembly (130) from injection moulding high pressure and to protect from the direct impact of the hot moulding material and pressure;
e. the final insert moulded assembly (128) is thus assembled.

6. The assembly as claimed in claim 1, wherein the button assembly (124) increasing the pull-out strength of NTC leads (116) & cable strand (134) crimping and wiring harness cable.

7. The assembly as claimed in claim 1, wherein the partition (120) eliminates NTC short circuit issue permanently and guides the NTC crimping while keeping both the leads separate from each other.

8. The assembly as claimed in claim 1, wherein the assembly of the temperature sensor module (102) starts with Button assembly (124) and crimping between the harness wire (134) and NTC lead (116), followed by Heat shrink sleeve (126) and tube (118) insertion, such that the Heat Shrink sleeve (126) covers crimp joints (136) along with the partition (120) to protect unnecessary Short circuit between wires and tube (118) plays role of guards or shield over crimp joints (136) against the Injection Moulding Pressure.
, Description:FIELD OF INVENTION
The present invention in general relates to a temperature sensing assembly and more particularly it relates to an improved temperature sensing assembly to detect and measure the temperature at various locations in a vehicle.
BACKGROUND OF THE INVENTION

Modern automotive engines typically rely on numerous engine parameters for correct engine operation. Optimum engine parameters are generally stored in the memory of an engine controller. Sensors on the engine are used to sense actual engine parameters while the controller compares these sensed values to the stored optimum valves. As a result, it is important that a reliable, repeatable sensor be installed in the engine having little engine-to-engine variation, such that a correct engine operating parameter is sensed.
Various sensors for sensing the temperature of a rigid body, such as a cylinder head of an internal combustion engine, have been developed. The sensor must be in intimate thermal contact with the rigid body to sense the proper temperature. To provide good thermal conductivity, some sensor designs utilize a spring such that, when installed, the spring provides a force to bias the sensor into contact with the rigid body to establish adequate thermal conductivity. Still other sensor designs rely on the mounting threads to provide the conductive path between the rigid body and the sensor. However, the previous temperature sensors have not provided an accurate reading of the temperature parameters in the cylinder head of an engine. Moreover, there is always a risk of short circuit in the temperature sensor that leads to damage or inaccuracy in the readings. There is therefore felt a need to provide improved temperature sensing assembly that overcomes this drawbacks.

OBJECTIVES OF THE INVENTION
Some of the objects of the present disclosure, which at least one embodiment herein satisfies, are as follows:
It is an object of the present disclosure to ameliorate one or more problems of the prior art or to at least provide a useful alternative.
An object of the present invention is to provide an improved temperature sensing assembly in the engine of a vehicle.
Another object of the present invention is to provide the improved temperature sensing assembly that prevents and eliminates short circuit issues and other warranty failures.
Another object of the present invention is to provide the improved temperature sensing assembly that includes a button and partition assembly.
Another object of the present invention is to provide the improved temperature sensing assembly that prevents short circuit issues by preventing touching of the two leads of the thermistor type Temperature sensor and the harness wires.
Another object of the present invention is to provide the improved temperature sensing assembly that can withstand pull out forces with minimum impact on the crimping area where the leads of the thermistor type Temperature sensor harness wires join.
Another object of the present invention is to provide the improved temperature sensing assembly with protected and shielded crimp joints that are prone to breakage or damage with external force and pressure.
Another object of the present invention is to provide the improved temperature sensing assembly that is easy to assemble, is cost effective and can be used to measure temperatures at various locations in the vehicle like engine cylinder head, engine oil, engine coolant, Intake air, etc.
Other objects and advantages of the present disclosure will be more apparent from the following description, which is not intended to limit the scope of the present disclosure.
SUMMARY OF THE INVENTION
Before the present invention is described, it is to be understood that present invention is not limited to particular methodologies and materials described, as these may vary as per the person skilled in the art. It is also to be understood that the terminology used in the description is for the purpose of describing the particular embodiments only, and is not intended to limit the scope of the present invention.
The present invention describes an improved temperature sensing assembly for detecting and measuring the temperature at various locations in a vehicle. Typically, the temperature sensor assembly is used to detect the temperature at the cylinder head of the vehicle engine and the engine oil temperature.
According to the embodiment of the invention, the assembly of the temperature sensor starts with Button assembly and crimping. Button is basically implemented to avoid externally mechanical force on Crimp joints between wire and NTC. Button Holds the wire and protect NTC and Crimp joint from any external impact. This is followed by Heat shrink sleeve and tube insertion. The Heat Shrink sleeve covers crimp joints along with the partition to protect unnecessary short circuit between wires. After Shrinkage of sleeve, Tube Insertion is done over sleeves. Tube plays role of guards or shield over crimp joints against the Injection Moulding Pressure. Because of Tube assembly NTC and Crimp area remains safe from Moulding Pressure and protects from direct impact of the hot moulding material and pressure. After implementation of Button and Partition Parts, the assembly is verified for mechanical force.

BRIEF DESCRIPTION OF THE DRAWINGS
A complete understanding of the present invention may be made by reference to the following detailed description which is to be taken in conjugation with the accompanying drawing. The accompanying drawing, which is incorporated into and constitutes a part of the specification, illustrates one or more embodiments of the present invention and, together with the detailed description, it serves to explain the principles and implementations of the invention.
FIG.1 is the front perspective view of the temperature sensing assembly according to an embodiment of the invention;
FIG.2a is the front perspective view of the temperature sensor module of the temperature sensing assembly as shown in FIG.1 according to the embodiment of the invention;
FIG.2b is the cross-sectional view of the temperature sensor module of the temperature sensing assembly as shown in FIG.1 according to the embodiment of the invention;
FIG.3 is the perspective view of the Insert moulding assembly of the temperature sensor module of the temperature sensing assembly as shown in FIG.1 according to the embodiment of the invention;
FIG. 4 is the perspective view of the sub assembly for insert moulding of the temperature sensor module of the temperature sensing assembly as shown in FIG.1 according to the embodiment of the invention;
FIG 5A and FIG.5B are the perspective and isometric view of the sub assembly for insert moulding before Tube insertion of the temperature sensor module of the temperature sensing assembly as shown in FIG.1 according to the embodiment of the invention;
FIG. 6 is the different view of the sub assembly for insert moulding before Tube insertion of the temperature sensor module of the temperature sensing assembly as shown in FIG.1 according to the embodiment of the invention;
FIG. 7 is the perspective view of the button/wire holding assembly of the temperature sensor module of the temperature sensing assembly as shown in FIG.1 according to the embodiment of the invention;
FIG. 8 is the perspective view of the partition of the temperature sensor module of the temperature sensing assembly as shown in FIG.1 according to the embodiment of the invention.

DETAILED DESCRIPTION OF THE INVENTION

Before the present invention is described, it is to be understood that this invention is not limited to particular methodologies described, as these may vary as per the person skilled in the art. It is also to be understood that the terminology used in the description is for the purpose of describing the particular embodiments only, and is not intended to limit the scope of the present invention. Throughout this specification, the word “comprises”, or variations such as “comprises” or “comprising”, will be understood to imply the inclusion of a stated element, integer or step, or group of elements, integers or steps, but not the exclusion of any other element, integer or step, or group of elements, integers or steps. The use of the expression “at least” or “at least one” suggests the use of one or more elements or ingredients or quantities, as the use may be in the embodiment of the invention to achieve one or more of the desired objects or results.
LIST OF REFERENCE NUMERALS:

Sr. No. Description of the part
100 Temperature sensing assembly
102 Temperature sensor module
104 Silicon Varnished Sleeve
106 Coupler
108 Brass outer body
110 Insert moulded part
112 Thermal paste
114 Temperature sensor bulb
116 NTC type thermistor lead
118 Tube
120 Partition
122 O- ring
124 Button/ wire holding assembly
126 Sleeve moulded with button part
128 Sub-assembly for Insert moulding
130 Sub-assembly for Insert moulding before tube insertion
132 NTC Lead insulation
134 Harness cable/wire
136 NTC thermistor lead and cable strand cramping
138 Projections on button
140 Slot on button to lock and guide the partition
142 Slot on button for wire guide to turn on both sides
144 Holes on the button assembly
146 Slots for wire guide on both sides
148 Flat tapered profile of the Partition
150 Groove on partition to lock in button slot
152 Lock stopper on partition

The present invention describes an improved temperature sensing assembly (100) for detecting and measuring the temperature at various locations in a vehicle. Typically, the temperature sensor assembly is used to detect the temperature at the cylinder head of the vehicle engine and the engine oil temperature. The temperature sensing assembly (100) generally includes an NTC (Negative Thermistor Coefficient) type Thermistor (113) which detect temperature of its surrounding and gives readings in the form of resistance to the ECU. The Operating & Storage Temp. Range of the thermistor is -55 ºC TO 250 ºC, its response Time : 60~80 sec with accuracy of ±5 %, and its body Material is Brass. Alternatively, other thermistor types can also be used, however for automotive purposes, generally NTC type thermistor is used.
According to an embodiment of the invention, FIG.1 is the front perspective view of the temperature sensing assembly. A typical temperature sensing assembly(100) comprises of a temperature sensor module (102), a silicon varnished sleeve (104) and a coupler (106). The silicon varnished sleeve(104) is made of Varnished Fiber glass (VFG) coated with silicon resin and is used to protect the harness wires and to keep both the wires together.
According to the embodiment of the invention, FIG.2a is the front perspective view of the temperature sensor module of the temperature sensing assembly as shown in FIG.1 and FIG.2b is the cross-sectional view of the temperature sensor module of the temperature sensing assembly as shown in FIG.1. The temperature sensor module (102) further comprises of a brass outer body (108), an insert moulded part(110) and a sleeve moulded part (126). Inside the brass body (108), NTC thermistor(113) is arranged with the temperature sensor bulb (114), NTC leads (116), cable strands of the harness cable or wire (134). Thermal paste (112) is present around the temperature sensor bulb (114) to prevent thermal shock. O ring (122) is present below the brass outer body. Many times, it has been observed that the NTC leads (116) from opposite sides come in contact with each other which leads to short-circuit conditions and the temperature sensing is affected and leads to warranty failures of the sensors. In the given embodiment of the present invention, to eliminate short circuit issue of the thermistor leads permanently, two components are designed and implemented in the temperature sensing assembly. These are Button/ wire holding assembly (124) and a partition assembly (120).
According to the embodiment of the invention, FIG.3 is the perspective view of the Insert moulding assembly of the temperature sensor module of the temperature sensing assembly as shown in FIG.1. The insert moulded assembly (128) comprises of the tube (118), the insert moulded part (110) , the temperature sensor bulb (114) of the NTC with the NTC leads(116). FIG. 4 is the perspective view of the sub assembly for insert moulding of the temperature sensor module of the temperature sensing assembly as shown in FIG.1. the insert moulded part covers the button assembly (124). The tube (118) is additionally inserted over the crimp joints (136) that plays the role of guards or shield over crimp joints against the Injection Moulding Pressure. Because of Tube assembly (118) NTC and Crimp joints (136) area remains safe from Moulding Pressure.
According the embodiment of the present invention, FIG. 5A and FIG.5B are the perspective and isometric view of the sub assembly for insert moulding before Tube insertion in the temperature sensor module of the temperature sensing assembly as shown in FIG.1. FIG. 6 is the different view of the sub assembly for insert moulding before Tube insertion of the temperature sensor module of the temperature sensing assembly.The process of insert moulding assembly is carried out by the following steps:
• Harness wires (136) are routed into the button assembly (124) and the heat shrink sleeve (126) is inserted followed by the crimping process with the NTC leads (116) with the help of a splice crimping machine.
• Resistance welding is carried out at the crimping joints (136) to homogenise the NTC leads (116) , harness wires (134) and the crimp material.
• Sleeve heating done to shrink the sleeve (126) over the crimping joints (136) with the help of an IR (infrared) gun with controlled heat and time.
• Then, the partition (120) is inserted between crimped joints (136) portions and guided in the button assembly (124).
• Tube (118) is then inserted to protect the crimping assembly (130) from injection moulding high pressure and to protect from the direct impact of the hot moulding material and pressure.
• The final insert moulded assembly (128) is thus assembled.
According to an embodiment of the invention, FIG. 7 is the perspective view of the button/wire holding assembly of the temperature sensor module of the temperature sensing assembly. The Button/ wire holding assembly (124) is present at the distal end of the temperature sensor module (102). It is used to guide the cable of wiring harness (134) correctly. The button/wire holding assembly (124) comprises of a frame made of nylon 66 30% glass field plastics which has various slots and holes. There are two slots (140) to lock and guide the partition, and slots (142) for guiding wires on both sides. The button/wire holding assembly also has two holes (144) on opposite sides to hold the assembly in the mould. At the lower end of this button/ wire holding assembly, there are two projections (138) to hold the silicon varnished sleeve (104) for insert moulding. The lower end of this assembly also has an elongated slot (146) for wire guides on both the sides. The placement of the Button is such that it leads to very minimum impact of cable pull out force on NTC leads and cable crimping. The Button is designed in such a way that all the pull out force is sustained by cable itself.
FIG. 8 is the perspective view of the partition of the temperature sensor module of the temperature sensing assembly. The Partition assembly (120) is present between the two leads (116) of the NTC thermistor (113) and functions to keep the leads separate from each other to prevent their contact with each other. Although, the heat Shrink sleeve covers the crimp joints (136) that join the NTC leads (116) and the cable strands (134), however these protection is not adequate and leads to unnecessary short circuit between wires. To eliminate the short circuit issue permanently, the partition assembly (120) is implemented in the temperature sensing assembly. The partition assembly comprises of a flat tapered profile (148) that acts as the partition between two crimp joints (136). It also comprises of two grooves (150) on the opposite sides to rest and lock in the button slot and a lock stopper (152) to lock the rotational movement of the partition
According to the embodiment of the present invention, the Button assembly has the following advantages:
? Increasing the pull out strength of NTC & cable strand crimping and wiring harness cable to approximately 20 -25 Kg.
? Useful to guide the crimping assembly in Moulding process leads to very less rejection in the moulding process.
? Button assembly is designed in such a way that no indusial twisting of the wire is required, as both the wires twit in each other through button to get more pull force.
? Button assembly is easy to assemble.
? Button assembly also helps to hold the partition.

According to the embodiment of the present invention, the Partition assembly has the following advantages
? Eliminates NTC short circuit issue permanently.
? Guide the NTC crimping while keeping both the leads separate from each other)
According to the embodiment of the present invention, the assembly of the temperature sensor starts with Button assembly and crimping. Button is basically implemented to avoid externally mechanical force on Crimp joints between wire and NTC. Button Holds the wire and protect NTC and Crimp joint from any external impact. This is followed by Heat shrink sleeve and tube insertion. The Heat Shrink sleeve covers crimp joints along with the partition to protect unnecessary short circuit between wires. After Shrinkage of sleeve, Tube Insertion is done over sleeves. Tube plays role of guards or shield over crimp joints against the Injection Moulding Pressure. Because of Tube assembly NTC and Crimp area remains safe from Moulding Pressure and protects from direct impact of the hot moulding material and pressure. After implementation of Button and Partition Parts, the assembly is verified for mechanical force.
According to the embodiment of the present invention, the pull force on cable has been checked by applying force on cable using push-pull gauge. Force up to 20-25 kgs was sustained by the temperature sensing assembly and no short circuit issue was observed after implementing the partition.
While considerable emphasis has been placed herein on the components and component parts of the preferred embodiments, it will be appreciated that many embodiments can be made and that many changes can be made in the preferred embodiments without departing from the principles of the disclosure. These and other changes in the preferred embodiment as well as other embodiments of the disclosure will be apparent to those skilled in the art from the disclosure herein, whereby it is to be distinctly understood that the foregoing descriptive matter is to be interpreted merely as illustrative of the disclosure and not as a limitation.