FORM 2
The Patent Act 1970
(39 OF 1970)
AND
THE PATENT RULES, 2005
COMPLETE SPECIFICATION (See Section 10; rule 13)
TITLE OF THE INVENTION
“A CONTROL SYSTEM FOR OPERATING A BLOWER OF A VENTILATION SYSTEM OF A VEHICLE USING A RELAY”
APPILICANT(S)
TATA MOTORS LIMITED
an Indian company
having its registered office at Bombay house,
24 Homi Mody Street, Hutatma Chowk,
Mumbai 400 001,
Maharashtra, INDIA.
PREAMBLE TO THE DESCRIPTION
The following specification particularly describes the invention and the manner in which it is to be performed.

FIELD OF THE INVENTION
[0001] The present disclosure relates to a ventilation system of a vehicle,
and more particularly relates to a control system for operating a blower of a ventilation system of the vehicle using a relay.
BACKGROUND OF THE INVENTION
[0002] A vehicle ventilation system generally includes various cooling
components, such as variable speed electric motor, fan, blower, condenser, coolant, radiator, etc. Smooth vehicle crank is one of the major considerations in the vehicles. Further, battery health affects the vehicles long-term health. Truck drivers make blower ON in vehicle ACC\IGN ON condition, which leads to discharge of battery. Blower power supply is via Accessory line. In a normal practice, truck drivers make the blower motor ON in accessory condition, which further lead to drainage of battery charge and subsequently causes troubled vehicle crank. In many occasions the vehicle may not get crank also. Due to this, automotive manufacturer may often be forced to increase battery capacity and which lead to increase in overall vehicle cost.
[0003] “With existing system fleet owners/customers faced issues where
vehicle drivers drain the battery by operating blower motors for long duration in IGN On condition, which subsequently result in vehicle not cranking so as result is inconvenience for customer/dealer ,result in vehicle standstill , result in financial losses”.
[0004] The present disclosure is directed to overcome one, more limitations
stated above, or any other limitations.

OBJECT OF THE INVENTION
[0005] The principal object of the embodiments herein is to provide a
control system for operating a blower of a ventilation system of a vehicle using a relay.
[0006] Another object of the embodiments herein is to provide an operating
strategy for a blower of a ventilation system of a vehicle using a relay. The blower is operable by a relay when an ignition switch is turned ON to crank an engine of the vehicle and the blower is turned OFF by the relay when the engine is turned OFF. The blower operating strategy focuses on a battery life enhancement of the vehicle.
SUMMARY OF THE INVENTION
[0007] In one aspect the object is satisfied by providing a control system for
operating a blower of a ventilation system of a vehicle. The control system comprising a blower motor connected to a knob, a relay switch connected to the blower motor, a blower controller connected to the relay switch. The blower controller comprises an ignition input terminal and a W terminal. The blower controller is configured to receive an ignition-ON input of the vehicle from the ignition input terminal, sense a voltage outputted at the W terminal, determine whether the voltage meets a predefined threshold, and activate the blower motor by engaging the relay switch to crank an engine of the vehicle in response to determining that the voltage meets the predefined threshold. Further, the blower controller is configured to receive an ignition-OFF input of the vehicle from the ignition input terminal, and deactivate the blower motor by disengaging the relay switch.
[0008] In an embodiment, the blower controller is mounted on a bracket
with fasteners.

[0009] In an embodiment, one end of the relay switch is connected to a
positive terminal of a power supply and a positive terminal of a battery while the other end of the relay switch is connected to the blower motor.
[0010] In another aspect the object is satisfied by providing a method for
operating a blower of a ventilation system of a vehicle using a control system. The method comprises receiving an ignition-ON input of the vehicle from an ignition input terminal, sensing a voltage provided by a W terminal determining whether the voltage meets a predefined threshold, and activating a blower motor connected to a relay switch to crank an engine of the vehicle in response to determining that the voltage meets the predefined threshold, wherein the blower motor is activated by engaging the relay switch. Further, the method comprises receiving an ignition-off input of the vehicle from the ignition input terminal, and deactivating the blower motor by disengaging the relay switch.
[0011] These and other aspects of the embodiments herein will be better
appreciated and understood when considered in conjunction with the following description and the accompanying drawings. It should be understood, however, that the following descriptions, while indicating preferred embodiments and numerous specific details thereof, are given by way of illustration and not of limitation. Many changes and modifications may be made within the scope of the embodiments herein without departing from the spirit thereof, and the embodiments herein include all such modifications.
BRIEF DESCRIPTION OF DRAWINGS
[0012] The proposed control system and operating strategy is illustrated in
the accompanying drawings, throughout which like reference letters indicate corresponding parts in the various figures. The embodiments herein will be better understood from the following description with reference to the drawings, in which:

[0013] FIG. 1 illustrates a schematic representation of a control system for
operating a blower of a ventilation system of a vehicle, according to embodiments as disclosed herein;
[0014] FIG. 2 illustrates a circuit diagram of the control system, according
to embodiments as disclosed herein; and
[0015] FIG. 3 illustrates a flow chart illustrating an operating strategy for a
blower of a ventilation system of a vehicle using a relay, according to embodiments as disclosed herein.
DETAILED DESCRIPTION OF THE INVENTION
[0016] The embodiments herein and the various features and advantageous
details thereof are explained more fully with reference to the non-limiting embodiments that are illustrated in the accompanying drawings and detailed in the following description. Descriptions of well-known components and processing techniques are omitted so as to not unnecessarily obscure the embodiments herein. Also, the various embodiments described herein are not necessarily mutually exclusive, as some embodiments can be combined with one or more other embodiments to form new embodiments. The term “or” as used herein, refers to a non-exclusive or, unless otherwise indicated. The examples used herein are intended merely to facilitate an understanding of ways in which the embodiments herein can be practiced and to further enable those skilled in the art to practice the embodiments herein. Accordingly, the examples should not be construed as limiting the scope of the embodiments herein.
[0017] The accompanying drawings are used to help easily understand
various technical features and it should be understood that the embodiments presented herein are not limited by the accompanying drawings. As such, the present disclosure should be construed to extend to any alterations, equivalents and substitutes in addition to those which are particularly set out in the accompanying drawings. Although the terms first, second, etc. may be used herein to describe

various elements, these elements should not be limited by these terms. These terms are generally only used to distinguish one element from another.
[0018] Referring now to the drawings, and more particularly to FIGS. 1-3,
there are shown preferred embodiments.
[0019] FIG. 1 illustrates a schematic representation of a control system (1)
for operating a blower of a ventilation system of a vehicle, according to embodiments as disclosed herein. The control system (1) is mounted on a bracket (2) with fasteners (3 and 4).
[0020] A circuit diagram of the control system (1) is shown in the FIG. 2.
The control system (1) comprising a blower controller (5), a relay switch (6) connected to the blower controller (5), and a blower motor (7) connected to the relay switch (6). “Complete control system is installed inside dash board” . Blower Controller (5) installed inside cabin with a mounting bracket. Relay switch (6) is mounted inside fuse box. Blower motor(7) is installed inside dashboard” .The blower controller (5) is connected to an ignition input terminal (8), a W terminal (9) and a ground terminal (10). One end of the relay switch (6) is connected to a positive terminal of a power supply (11) and a positive terminal (12) of a battery while the other end of the relay switch (6) is connected to the blower motor (7). Further, the blower motor (7) is connected a knob (12) which is used by a user/driver of the vehicle to manually control a speed of the blower motor (7).
[0021] In an embodiment, the blower controller (5) is configured to receive
an ignition-ON input of the vehicle from the ignition input terminal (8). Upon receiving the ignition-ON input, the blower controller (5) is configured to sense a voltage provided by the W terminal (9) and determine whether a voltage meets a predefined threshold. In response to determining that the voltage meets the predefined threshold, the blower controller (5) is configured to activate the blower motor (7) by engaging the relay switch (6). Further, the blower controller (5) is

configured to receive an ignition-OFF input of the vehicle, and deactivate the blower motor (7) by disengaging the relay switch (6).
[0022] For example, the blower controller (5) allows user to make the
blower motor (7) to switch on only with the W terminal (9) output frequency signal is greater than 100 Hz when engine is running. The blower motor (7) is switched on automatically by engaging the relay switch (6). When the W terminal (9) output frequency signal is not greater than 100 Hz the relay switch (6) won’t be engaged. The engagement of the relay switch (6) by the blower controller (5) further engages the power supply (11) of the blower motor (7). The speed of the blower motor (7) can be controlled by the user or driver of the vehicle using the knob (12).
[0023] FIG. 3 illustrates a flow chart illustrating a method for a blower of a
ventilation system of a vehicle using a relay switch (6), according to embodiments as disclosed herein. At step 302, the method including receiving an ignition-ON input of the vehicle from an ignition input terminal (8). When the driver of the vehicle switches on the ignition switch of the vehicle, ignition system of the vehicle generate a high volt age from battery of the vehicle, and to send this voltage to each sparkplug that in turn ignite the fuel-air mixture in the engine 's combustion chambers.
[0024] At step 304, the method includes sensing the voltage outputted at the
W terminal (9). When the ignition system is switched on, the W terminal (9) generally outputs an unrectified AC voltage, the frequency of which is proportional to the engine speed.
[0025] At step 306, the method includes determining whether the voltage
meets a predefined threshold. For example, the predefined threshold herein can be 100 Hz. In response to determining that the voltage meets the predefined threshold, at step 308, the method includes activating a blower motor (7) connected to a relay switch (6) to crank an engine of the vehicle. The blower motor (7) is activated by

engaging the relay switch (6). For example, if the W terminal (7) signal frequency is greater than the predefined threshold of 100 Hz then them the relay switch (6) is engaged to subsequently energize the blower motor (7). Once the blower motor (7) is ON, the user/driver of the vehicle can further adjust speed with the knob (12). In response to determining that the voltage does not meets the predefined threshold, the method continue sensing the voltage outputted at the W terminal (9).
[0026] Further, at step 310, the method includes receiving an ignition-off
input of the vehicle from the ignition input terminal (8). When the ignition-off input is received, at step 312, the method includes deactivating the blower motor (7) by disengaging the relay switch (6).
[0027] The proposed control system can be used to enhance the battery life
of the vehicle as the blower motor is automatically switched on upon exceeding the predefined threshold. Further, the proposed invention can be used to provide smooth vehicle crank of the engine which not only increases the batter life but also improvises the overall vehicle health. The quick energization of the blower motor using the relay will avoid discharging or drainage of the battery thereby providing smooth crank of the engine.
[0028] The foregoing description of the specific embodiments will so fully
reveal the general nature of the embodiments herein that others can, by applying current knowledge, readily modify and/or adapt for various applications such specific embodiments without departing from the generic concept, and, therefore, such adaptations and modifications should and are intended to be comprehended within the meaning and range of equivalents of the disclosed embodiments. It is to be understood that the phraseology or terminology employed herein is for the purpose of description and not of limitation. Therefore, while the embodiments herein have been described in terms of preferred embodiments, those skilled in the art will recognize that the embodiments herein can be practiced with modification within the spirit and scope of the embodiments as described herein.

[0029] Following are the reference numerals:

Numeral Description
1 control system knob
2 bracket
3 fastener
4 fastener
5 blower controller
6 relay switch
7 blower motor
8 ignition input terminal
9 W terminal
10 positive terminal of battery
11 positive terminal of power supply
12 knob

We Claim:
1. A control system (1) for operating an a blower of a ventilation system of a
vehicle, the control system (1) comprising:
a blower motor (7) connected to a knob (12); a relay switch (6) connected to the blower motor (7); and
a blower controller (5) connected to the relay switch (6), wherein the blower controller (5) comprises an ignition input terminal (8) and a W terminal (9), and wherein the blower controller (5) is configured to:
receive an ignition-ON input of the vehicle from the ignition input terminal (8),
sense a voltage outputted at the W terminal (9),
determine whether the voltage meets a predefined threshold, and activate the blower motor (7) by engaging the relay switch (6) to crank an engine of the vehicle in response to determining that the voltage meets the predefined threshold.
2. The control system (1) as claimed in claim 1, wherein the blower controller (5)
is further configured to:
receive an ignition-OFF input of the vehicle from the ignition input terminal (8), and
deactivate the blower motor (7) by disengaging the relay switch (6).
3. The control system (1) as claimed in claim 1, wherein the blower controller (5) is mounted on a bracket (2) with fasteners (3 and 4).
4. The control system (1) as claimed in claim 1, wherein one end of the relay switch (6) is connected to a positive terminal of a power supply (11) and a positive terminal (12) of a battery while the other end of the relay switch (6) is connected to the blower motor (7).

5. A method for operating an a blower of a ventilation system of a vehicle using a
control system (1), the method comprises:
receiving, by the control system (1), an ignition-ON input of the vehicle from an ignition input terminal (8);
sensing, by the control system (1), a voltage provided by a W terminal (9);
determining, by the control system (1), whether the voltage meets a predefined threshold; and
activating, by the control system (1), a blower motor (7) connected to a relay switch (6) to crank an engine of the vehicle in response to determining that the voltage meets the predefined threshold, wherein the blower motor (7) is activated by engaging the relay switch (6).
6. The method as claimed in claim 5, comprising:
receiving, by the control system (1), an ignition-off input of the vehicle from the ignition input terminal (8), and
deactivating, by the control system (1), the blower motor (7) by disengaging the relay switch (6).
7. The method as claimed in claim 5, wherein the blower controller (5) is mounted on a bracket (2) with fasteners (3 and 4).
8. The method as claimed in claim 5, wherein one end of the relay switch (6) is connected to a positive terminal of a power supply (11) and a positive terminal (12) of a battery while the other end of the relay switch (6) is connected to the blower motor (7).