Claims:1. A system (100) for operating a radiator fan motor (1) of a vehicle, the system (100) comprising:
a load switching circuit (50), comprising:
a plurality of relays (R1 to Rn) interfaced with the radiator fan motor (1), wherein each of the plurality of relays (R1 to Rn) is configured to selectively complete a circuit between a predefined terminal (T1-T4) of the radiator fan motor (1) and at least one of a power source (3) and a common electric ground (G); and
an electronic control unit (2) interfaced with the load switching circuit (50), wherein the electronic control unit (2) is configured to selectively switch one or more of the plurality of relays (R1 to Rn) based on one or more conditions, to operate the radiator fan motor (1) at a variable speed.

2. The system (100) as claimed in claim 1, wherein the electronic control unit (2) determines the one or more conditions by comparing one or more input data received from a plurality of sensors (P1 to Pn) associated with cooling units (25) in the vehicle with a predetermined threshold data.

3. The system (100) as claimed in claim 2, wherein the one or more input data includes temperature of engine coolant, pressure of coolant in air-conditioner unit, and state of air conditioner switching module.

4. The system (100) as claimed in claim 1, wherein the variable speed is at least one of low speed, medium speed, and high speed.

5. The system (100) as claimed in claim 1, wherein the electronic control unit (5) switches the plurality of relays (P1 to Pn) in at least three different stages each corresponding to at least one of low speed, medium speed, and high speed of the radiator fan motor (1).

6. The system (100) as claimed in claim 1, wherein at least one terminal of the radiator fan motor (1) is directly connected to the common electric ground (G).

7. The system (100) as claimed in claim 5, wherein the radiator fan motor (1) is operated in low-speed by completing a circuit between at least one terminal (T1-T4) of the radiator fan motor (1) and the power source (3).

8. The system (100) as claimed in claim 5, wherein the radiator fan motor (1) is operated in medium-speed by completing a circuit between at least two terminals (T1-T4) of the radiator fan motor (1) each with at least one of the power source (3) and the common electric ground (G).

9. The system (100) as claimed in claim 5, wherein the radiator fan motor (1) is operated in high-speed by completing a circuit between at least two terminals (T1-T4) of the radiator fan motor (1) with the power source and at least one terminal (T1-T4) of the radiator fan motor (1) with common electric ground (G).

10. The system (100) as claimed in claim 1, wherein each of the plurality of relays (R1 to Rn) is an inductance relay.

11. The system (100) as claimed in claim 1, wherein the cooling units (25) are engine cooling unit and air conditioning unit.

12. A method for operating a radiator fan motor (1) of a vehicle, the method comprising:
receiving, by an electronic control unit (2), one or more input data from a plurality of sensors (P1 to Pn) associated with cooling units (25) of the vehicle;
comparing, by the electronic control unit (2), the one or more inputs data with a predetermined threshold data;
operating, by the electronic control unit (2), a load switching circuit (50) interfaced with the radiator fan motor (1) based on the comparison,
wherein, the electronic control unit (2) selectively switch one or more of the plurality of relays (R1 to Rn), and each of the plurality of relays (R1 to Rn) is configured to selectively complete a circuit between a predefined terminal (T1-T4) of the radiator fan motor (1) and at least one of power source (3) and common electric ground (G) to operate the radiator fan motor (1) at variable speed.

13. A vehicle comprising a system (100) for operating a radiator fan motor (1) as claimed in claim 1. , Description:TECHNICAL FIELD

Present disclosure, in general, relates to automobiles. Particularly, but not exclusively, the disclosure relates to cooling units of the automobiles. Further, embodiments of the disclosure, discloses a system and method for operating a radiator fan motor of the automobile at variable speed.

BACKGROUND OF THE DISCLOSURE
Generally, automobiles may be used to transport goods or passengers from one location to another location. The automobiles are provisioned with a propulsion unit known as engine for developing power required to operate the automobile. The engine generates the power by burning mixture of air and fuel. The engine may be rated with a suitable capacity, to manoeuvre the automobile in different road conditions. Conventional, automobiles such as passenger vehicles and goods carrying vehicles are equipped with cooling units such as air conditioning system for improving comfort of the occupants. Due to terrain variations and operation of cooling units, load acting on the automobile may be varied which would generate excessive heat in the engine. In order to cool the engine, and to maintain the engine within the operating temperatures, engine cooling units such as radiator arrangement is provided in the automobiles. Generally, the radiator may be operated during movement of the vehicle to cool the engine coolant. The radiator may also be termed as heat exchanger, which exchanges heat in the engine coolant with the surrounding air. The radiator may be disposed in communication with a radiator fan. The radiator fan may circulate air onto the radiator to dissipate the heat from engine coolant to surrounding air.

Conventionally, the radiator fan may be configured to run either at low-speed or at high-speed depending on temperature of the engine coolant. The operational speed of the fan may be controlled by a resistor circuit, and speed of the fan may be regulated in accordance with temperature of the engine coolant. In other words, the radiator fan may be operated in low speed when the temperature of the engine coolant is less than the predetermined temperature and may be operated to high speed when the temperature of the engine coolant exceeds the predetermined temperature. The change in fan speed provides improved cooling effect to the coolant, thereby maintains the temperature of the coolant within the operating limit.

However, in most of the circumstances, the temperature of the engine coolant may be slightly more than the pre-set limit, and may not be as high as it requires high fan speed to cool. But, in the conventional vehicles the fan may still be operated in the high speed, since the temperature is more than the pre-set limit. This increases load on the engine which may affect fuel efficiency of the vehicle.

Also, the use of resistor circuit for switching the radiator fan from low-speed to high-speed may consume additional power from the power source, thereby increases the load on the engine. Additionally, due to operation of the fan in high-speed for a longer duration, the resistor circuit may be excessively heated, and may result in failure of the resistor. The failure of either of the power source or the resistor network may hamper functioning of the radiator fan, and in turn operation of the automobile.

The present disclosure is directed to overcome one or more limitations stated above.

SUMMARY OF THE DISCLOSURE

One or more shortcomings of the prior art are overcome by a system and a method as claimed and additional advantages are provided through the system and the method as claimed in the present disclosure. Additional features and advantages are realized through the techniques of the present disclosure. Other embodiments and aspects of the disclosure are described in detail herein and are considered a part of the claimed disclosure.

In one non-limiting embodiment of the present disclosure a system for operating a radiator fan motor of a vehicle is disclosed. The system comprises a load switching circuit, which includes a plurality of relays. The plurality of relays is interfaced with the radiator fan motor, wherein each of the plurality of relays is configured to selectively complete a circuit between a predefined terminal of the radiator fan motor and at least one of a power source and common electric ground. Further, an electronic control unit is interfaced with the load switching circuit, wherein the electronic control unit is configured to selectively switch one or more of the plurality of relays based on one or more conditions, to operate the radiator fan motor at a variable speed.

In an embodiment, the electronic control unit determines the one or more conditions by comparing one or more input data received from a plurality of sensors associated with cooling units in the vehicle with a predetermined threshold data. The one or more input data includes temperature of engine coolant, pressure of coolant in air-conditioner unit, and state of air conditioner switching module.

In an embodiment, the variable speed is at least one of low speed, medium speed, and high speed. The electronic control unit switches the plurality of relays in at least three different stages each corresponding to at least one of low speed, medium speed, and high speed of the radiator fan motor.

In an embodiment, at least one terminal of the radiator fan motor is directly connected to the common electric ground.

In an embodiment, the radiator fan motor is operated in low-speed by completing a circuit between at least one terminal of the radiator fan motor and the power source. Further, the radiator fan motor is operated in medium-speed by completing a circuit between at least two terminals of the radiator fan motor each with at least one of the power source and the common electric ground. Also, the radiator fan motor is operated in high-speed by completing a circuit between at least two terminals of the radiator fan motor with the power source and at least one terminal of the radiator fan motor with common electric ground.

In an embodiment, each of the plurality of relays is an inductance relay.

In an embodiment, the cooling units are engine cooling unit and air conditioning unit.

In another non-limiting embodiment of the present disclosure, a method for operating a radiator fan motor of a vehicle is disclosed. The method comprises acts of receiving, by an electronic control unit, one or more input data from a plurality of sensors associated with cooling units of the vehicle. Comparing, by the electronic control unit, the one or more inputs data with a predetermined threshold data. Operating, by the electronic control unit, a load switching circuit interfaced with the radiator fan motor based on the comparison such that, the electronic control unit selectively switch one or more of the plurality of relays, and each of the plurality of relays is configured to selectively complete a circuit between a predefined terminal of the radiator fan motor and at least one of power source and common electric ground to operate the radiator fan motor at variable speed.

The foregoing summary is illustrative only and is not intended to be in any way limiting. In addition to the illustrative aspects, embodiments, and features described above, further aspects, embodiments, and features will become apparent by reference to the drawings and the following detailed description.

BRIEF DESCRIPTION OF THE ACCOMPANYING DRAWINGS

The novel features and characteristic of the disclosure are set forth in the appended claims. The disclosure itself, however, as well as a preferred mode of use, further objectives and advantages thereof, will best be understood by reference to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying figures. One or more embodiments are now described, by way of example only, with reference to the accompanying figures wherein like reference numerals represent like elements and in which:

Figure 1 illustrates a block diagram of a system for operating a radiator fan, in accordance with some embodiments of the present disclosure.

Figure 2 illustrates a schematic diagram of the system for operating a radiator fan in variable speed, in accordance with some embodiments of the present disclosure.
Figure 3a illustrates a schematic diagram of the relays in the system of FIG. 2.
Figure 3b illustrates a schematic diagram of a radiator fan motor, in accordance with some embodiments of the present disclosure.
Figure 4 illustrates a schematic diagram of the system for operating a radiator fan in variable speed, in accordance with an alternate embodiment of the present disclosure.
The figures depict embodiments of the disclosure for purposes of illustration only. One skilled in the art will readily recognize from the following description that alternative embodiments of the system and method illustrated herein may be employed without departing from the principles of the disclosure described herein.

DETAILED DESCRIPTION

While the embodiments in the disclosure are subject to various modifications and alternative forms, specific embodiment thereof has been shown by way of example in the figures and will be described below. It should be understood, however that it is not intended to limit the disclosure to the particular forms disclosed, but on the contrary, the disclosure is to cover all modifications, equivalents, and alternative falling within the scope of the disclosure.

The terms “comprises”, “comprising”, or any other variations thereof used in the disclosure, are intended to cover a non-exclusive inclusion, such that a device, assembly, mechanism, system, method that comprises a list of components does not include only those components but may include other components not expressly listed or inherent to such system, or assembly, or device. In other words, one or more elements in a system proceeded by “comprises… a” does not, without more constraints, preclude the existence of other elements or additional elements in the system or mechanism.

Embodiments of the present disclosure disclose a system and method for operating the radiator fan motor of automobile in variable speed. The system comprises a load switching circuit comprising a plurality of relays interfaced with the radiator fan motor. Each of the plurality of relays may be configured to selectively complete a circuit between a predefined terminal of the radiator fan motor with at least one of power source and common electric ground. Further, the system comprises an electronic control unit which is interfaced with the load switching circuit. The electronic control unit may be configured to selectively switch one or more of the plurality of relays, based on one or more conditions to operate the radiator fan motor at variable speed. In an embodiment of the disclosure, the electronic control unit may determine one or more conditions by comparing one or more input data received from a plurality of sensors associated with the cooling units of the vehicle with the predetermined threshold data.

The disclosure is described in the following paragraphs with reference to Figures 1 to 4. In the figures, the same element or elements which have same functions are indicated by the same reference signs. It is to be noted that, the vehicle is not illustrated in the figures for the purpose of simplicity. One skilled in the art would appreciate that the system and the method as disclosed in the present disclosure can be used in any vehicle including but not liming to passenger car, heavy vehicles, light duty vehicles or any other vehicle.

Referring to Figure 1 which is an exemplary embodiment of the present disclosure illustrating a block diagram of a system (100) for operating a radiator fan motor (1) at a variable speed. The system (100) comprises a load switching circuit (50), which includes a plurality of relays (R1 to Rn). The load switching circuit (50), may be interfaced to a radiator fan motor (1) and may be associated with an electronic control unit (2) of the vehicle.

The electronic control unit (2) may be communicatively coupled with a plurality of sensors (P1 to Pn), which may be associated with cooling units (25) such as, but not limited to, radiator unit and air-conditioner unit of the vehicle. The plurality of sensors (P1 to Pn) may be configured to sense one or more conditions of the cooling units (25), for generating one or more input data to the electronic control unit (2). The electronic control unit (2) receives the one or more input data from the plurality of sensors (P1 to Pn), and compare the one or more input data with a predetermined threshold data stored in a memory unit [not shown] associated with the electronic control unit (2). The electronic control unit (2) then, generates an operational signal for selectively switching the plurality of relays (R1 to Rn) of the load switching circuit (50). Based on selective switching of each of the plurality of relays (R1 to Rn), at least one predefined terminal (T1-T4) of the radiator fan motor (1) may be supplied with power. On supplying power to the predefined terminal (T1-T4) of the radiator fan motor (1), magnetic flux generated within the radiator fan motor (1) may be reformed, thereby, varying speed of the radiator fan motor (1).

In some embodiments, a power source (3) may be associated with the load switching circuit (50) and the radiator fan motor (1) to supply the power or energy for producing variable speed in the radiator fan motor (1).

In some embodiments, the predetermined threshold data may be either pre-set in the electronic control unit (1), or may be retrieved as a feedback from a memory unit [not shown in figures] associated with the electronic control unit (1).

Now referring to Figure 2, which illustrates a schematic representation of the system (100) for operating the radiator fan motor (1) in variable speed according an exemplary embodiment of the disclosure. As shown in Figure. 2, the system (100) includes the load switching circuit (50), which consists of three relays (R1, R2, R3) amongst the plurality of relays (R1 to Rn). The three relays (R1, R2, R3) may be communicatively connected to the radiator fan motor (1) and the electronic control unit (2) respectively. In an embodiment, each of the three relays (R1, R2, R3), is inductance relay [best shown in Figure 3a]. Further, each of the three relays (R1, R2, R3) may be equipped with at least one coil (4), provisioned with at least two connectors (A’, B’) such that, the at least two connectors (A’, B’) interfaces each of the three relays (R1, R2, R3) with the radiator fan motor (1), the electronic control unit (2) and the power source (3), as seen in Figure 2. The at least one coil (4) may be positioned and actuated in vicinity of one or more latches (5) in each of the three relays (R1, R2, R3). The one or more latches (5) may be triggered due to magnetic flux generated by the at least one coil (4). Each of the one or more latches (5) are provisioned with an input terminal (C’) and an output terminal (D’) such that, the input terminal (C’) is connected to the power source (3) and the output terminal (D’) is connected with one of the predefined terminals (T1-T4) of the radiator fan motor (1). On actuation of the one or more latches (5), circuit in each of the three relays (R1, R2, R3) may be completed. The three relays (R1, R2, R3) are selectively switched by the electronic control unit (2), for supplying power to the predefined terminals (T1-T4) of the radiator fan motor (1), as shown in Figure 3b. The predefined terminals (T1-T4) maybe associated with an inductance coil [not shown in Figures] generating magnetic flux within the radiator fan motor (1), thereby, generating variable speed in the radiator fan motor (1).

In some embodiments, the radiator fan motor (1) may be at least one of a brush-type DC motor, a brushless DC motor, and the like.

As shown in Figure. 2, the input terminal (C’) of each of the three relays (R1, R2, R3) are connected to the power source (3), and the output terminal (D’) is connected to the predefined terminal (T1-T4) of the radiator fan motor (1). Based on operational signal, the electronic control unit (2), selectively switches the at least one coil (4) of each of the three relays (R1, R2, R3). The selective actuation of the at least one coil (4) of each of the three relays (R1, R2, R3) closes the one or more latches (5) corresponding to each of the three relays (R1, R2, R3) for completing the connection between the load switching circuit (50) and the radiator fan motor (1). This completes the circuit between the respective terminals (T1, T2, T3) of the radiator fan motor (1), and the at least one of the power source (3) and the common electric ground (G) for supplying power. Also, at least one terminal (T4) of the radiator fan motor (1) is connected to a common electric ground (G), for stabilizing magnetic flux generated within the radiator fan motor (1).

Further, the electronic control unit (2), connected to the load switching unit (50), is further interfaced with three sensors (P1, P2, P3) amongst the plurality of sensors (P1 to Pn). The three sensors (P1, P2, P3) may be associated with the cooling units (25), and assist in sensing one or more conditions of the cooling units (25). The three sensors (P1, P2, P3) then, generate the one or more input data to the electronic control unit (2). The electronic control unit (2) receives the one or more input data, and compares with a predetermined threshold data. Upon analysing and comparing the one or more input data, the electronic control unit (2) generates an operational signal to the load switching circuit (50). The three relays (R1, R2, R3), configured in the load switching circuit (50), selectively completes the circuit of the system (100), for generating varying magnetic flux in the radiator fan motor (1). The varying magnetic flux generated in the radiator fan motor (1) assists in producing variable speed to the radiator fan motor (1).

In an embodiment of the disclosure, the three sensors (P1, P2, P3) may sense conditions including, but not limited to, temperature of engine coolant, pressure of coolant in air-conditioner unit, state of air-conditioner switching module, and the like. Also, the predetermined threshold data may be associated with at least one of operational temperature of the engine coolant, working pressure of the coolant in air-conditioner unit, conditional state of the air-conditioner switching module and the like, for operating the radiator fan motor (1) at a variable speed.

In some embodiments, variable speed of the radiator fan motor (1) may be at least one of low speed, medium speed, and high speed.

The logical table, illustrated in Table 1, depicts the one or more conditions of the cooling units (25) sensed by the three sensors (P1, P2, P3), for generating the one or more input data to the electronic control unit (2). Based on the one or more input data received, the electronic control unit (2) operates the radiator fan motor (1) at variable speeds. The logical description is as follows:
Predetermined threshold data associated with the cooling units Operating speed of the radiator fan motor
Operational temperature of the engine coolant Working pressure of the coolant in air-conditioner unit Conditional state of the air-conditioner switching module Low-speed Medium-speed High-speed
Conditions < 60°C < 5 bar OFF/ON v
>60°C to < 85°C > 5 bar to < 25 bar OFF/ON v
> 85°C > 25 bar OFF/ON v

Table 1
In an exemplary embodiment of the disclosure, the predetermined threshold data associated with operational temperature of the engine coolant may be in the range of about 60°C to about 85°C for operating the radiator fan motor (1) at low-speed, while the predetermined threshold data may be in range of about 86°C to about 110°C for operating the radiator fan motor (1) at a medium-speed. The radiator fan motor (1) is operated at high-speed, if the operational temperature of the engine coolant may exceed 110°C. Further, the predetermined threshold data associated with working pressure of the coolant in air-conditioner unit may be in the range of about 1 bar to about 5 bar for operating the radiator fan motor (1) at low-speed, while the predetermined threshold data may be in range of about 6 bar to about 25 bar for operating the radiator fan motor (1) at a medium-speed. The radiator fan motor (1) is operated at high-speed, if the working pressure of the coolant in air-conditioner unit may exceed 25 bar. Also, the predetermined threshold data associated with conditional state of the air-conditioner switching module may be at least one of ON state and OFF state. The speed of the radiator fan motor (1) is varied from low-speed, only if the air-conditioner switching module is in ON state and at least one of the conditions pertaining to the operational temperature of the engine coolant and the working pressure of the coolant in air-conditioner unit may be surpassed. This ensures that the radiator fan motor (1) is operated at an optimal speed, thereby enhancing fuel efficiency of the vehicle.

In an embodiment, the radiator fan motor (1) is operated in three states of variable speeds, based on selective actuation of the three relays (R1, R2, R3) of the load switching circuit (50).

At first condition, the radiator fan motor (1) may be operated at low-speed: The electronic control unit (2) receives the one or more input data from the three sensors (P1, P2, P3), pertaining to the one or more conditions of the cooling units (25). The electronic control unit (2) compares the one or more input data with the predetermined threshold data. If the operational temperature of the engine coolant is found to be less than first predetermined temperature and the working pressure of the coolant in air-conditioner unit is found to be less than first predetermined pressure, the electronic control unit (2) operates the radiator fan in low-speed. To operate the radiator fan motor (1) in low-speed, the electronic control unit (2) selectively switches a first relay (R1) of the three relays (R1, R2, R3). On actuation of the first relay (R1), power from the power source (3) may be supplied to the predefined terminal (T1) of the radiator fan motor (1). The at least one coil [not shown in Figures] associated with the predefined terminal (T1) generates magnetic flux for operating the radiator fan motor (1). As predefined terminal (T4) of the radiator fan motor (1) is connected to the common electric ground (G), and power from the load switching circuit (50) is supplied to at least one coil of the radiator fan motor (1), a single pole-single ground network may be established, thereby, operating the radiator fan motor (1) at a low speed.

At second condition, the radiator fan motor (1) may be operated at medium-speed: Upon receiving one or more input data from three sensors (P1, P2, P3). The electronic control unit (2) compares the one or more input data with the predetermined threshold data. If the operational temperature of the engine coolant is found to be more than first predetermined temperature and less than second predetermined temperature, and the working pressure of the coolant in air-conditioner unit is found to be more than first predetermined pressure and less than second predetermined pressure, the electronic control unit (2) operates the radiator fan motor (1) in medium-speed. To operate the radiator fan motor (1) in medium-speed, the electronic control unit (2) selectively switches a second relay (R2), along with the first relay (R1) of the three relays (R1, R2, R3). On actuation of the first relay (R1) and the second relay (R2), power from the power source (3) may be supplied to the predefined terminals (T1) of the radiator fan motor (1) through the first relay (R1), the at least one coil [not shown in Figures] associated with the predefined terminal (T1) of the radiator fan motor (1) generates magnetic flux for operating the radiator fan motor (1). As the input terminal (C’) of the second relay (R2) is connected to common electric ground (G), the predefined terminal (T2) connecting the second relay (R2) acts as an auxiliary ground network for enhancing and diffusing magnetic flux within the radiator fan motor (1). Hence, a single pole-dual ground network may be established, thereby, enhancing operational speed of the radiator fan motor (1) from low speed to medium-speed.

At third condition, the radiator fan motor (1) may be operated at high-speed: Upon receiving input data from three sensors (P1, P2, P3), the electronic control unit (2) compares the one or more input data with the predetermined threshold data. If the operational temperature of the engine coolant is found to be more than the second predetermined temperature, and the working pressure of the coolant in air-conditioner unit is found to be more than second predetermined pressure, the electronic control unit (2) operates the radiator fan motor (1) in high-speed. To operate the radiator fan motor (1) in medium-speed, the electronic control unit (2) compares the one or more input data to selectively switch a third relay (R3), along with the first relay (R1) and the second relay (R2) of the three relays (R1, R2, R3). On actuation of each of the three relays (R1, R2, R3), power from the power source (3) may be supplied to the at least one coil [not shown in Figures] associated with the predefined terminals (T1, T3) of the radiator fan motor (1), through the first relay (R1) and the third relay (R3), while the input terminal (C’) of the second relay (R2) is connected to common electric ground (G) for creating a ground network. Power is supplied to the radiator fan motor (1) through the first relay (R1) and the third relay (R3) energizes magnetic flux generated through the ground network of the second relay (R2). The energized magnetic flux enables the radiator fan motor (1) to be operated at maximum speed. Hence, a dual pole-dual ground network may be established, thereby, increasing operational speed of the radiator fan motor (1) from medium-speed to high-speed.

Referring now to Figure 4, which illustrates alternate configuration of the load switching circuit (50) in accordance to the present disclosure. The load switching circuit (50) consist of six relays (R1 to R6), which are connected in a predefined manner. Each of the six relays (R1 to R6) have a configuration and functioning similar to the relay explicated in Figure 3a. The six relays (R1 to R6) may be configured into three individual circuits namely, a first circuit consisting of a first relay (R1); a second circuit consisting of a second relay (R2) and a third relay (R3); and a third circuit consisting of a fourth relay (R4), a fifth relay (R5) and a sixth relay (R6). Each of the three circuits may be connected to the power source (3), the electronic control unit (2) and the predefined terminal (T) of the radiator fan motor (1) in prescribed order. In an embodiment, the input terminals of the third relay (R3) and the fifth relay (R5) are connected to the common electric ground (G), for stabilizing magnetic flux generated within the radiator fan motor (1).

In the first circuit, on receiving an operational signal from the electronic control unit (2), the first relay (R1) is actuated to operate the radiator fan motor (1) at low-speed. Further, in the second circuit, on receiving an operational signal from the electronic control unit (2), the second relay (R2) and the third relay (R3) are actuated to operate the radiator fan motor (1) at medium-speed, while the first circuit is turned off. Also, in the third circuit, on receiving an operational signal from the electronic control unit (2), the forth relay (R4), fifth relay (R5) and the sixth relay (R6) are actuated to operate the radiator fan motor (1) at high-speed, while the first circuit and the second circuit are turned off.

In some embodiments, the electronic control unit (2) may be a centralised control unit of the vehicle or may be a dedicated control unit to the system associated with the centralised control unit of the vehicle. The electronic control unit (2) may include specialized processing units such as integrated system (bus) controllers, memory management control units, floating point units, graphics processing units, digital signal processing units, etc. The processing unit may include a microprocessor, such as AMD Athlon, Duron or Opteron, ARM’s application, embedded or secure processors, IBM PowerPC, Intel’s Core, Itanium, Xeon, Celeron or other line of processors, and the like. The electronic control unit (2) may be implemented using mainframe, distributed processor, multi-core, parallel, grid, or other architectures. Some embodiments may utilize embedded technologies like application-specific integrated circuits (ASICs), digital signal processors (DSPs), Field Programmable Gate Arrays (FPGAs), microcontroller, and the like.

EQUIVALENTS

With respect to the use of substantially any plural and/or singular terms herein, those having skill in the art can translate from the plural to the singular and/or from the singular to the plural as is appropriate to the context and/or application. The various singular/plural permutations may be expressly set forth herein for sake of clarity.

It will be understood by those within the art that, in general, terms used herein, and especially in the appended claims (e.g., bodies of the appended claims) are generally intended as “open” terms (e.g., the term “including” should be interpreted as “including but not limited to,” the term “having” should be interpreted as “having at least,” the term “includes” should be interpreted as “includes but is not limited to,” etc.). It will be further understood by those within the art that if a specific number of an introduced claim recitation is intended, such an intent will be explicitly recited in the claim, and in the absence of such recitation no such intent is present. For example, as an aid to understanding, the following appended claims may contain usage of the introductory phrases “at least one” and “one or more” to introduce claim recitations. However, the use of such phrases should not be construed to imply that the introduction of a claim recitation by the indefinite articles “a” or “an” limits any particular claim containing such introduced claim recitation to inventions containing only one such recitation, even when the same claim includes the introductory phrases “one or more” or “at least one” and indefinite articles such as “a” or “an” (e.g., “a” and/or “an” should typically be interpreted to mean “at least one” or “one or more”); the same holds true for the use of definite articles used to introduce claim recitations. In addition, even if a specific number of an introduced claim recitation is explicitly recited, those skilled in the art will recognize that such recitation should typically be interpreted to mean at least the recited number (e.g., the bare recitation of “two recitations,” without other modifiers, typically means at least two recitations, or two or more recitations). Furthermore, in those instances where a convention analogous to “at least one of A, B, and C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, and C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). In those instances where a convention analogous to “at least one of A, B, or C, etc.” is used, in general such a construction is intended in the sense one having skill in the art would understand the convention (e.g., “a system having at least one of A, B, or C” would include but not be limited to systems that have A alone, B alone, C alone, A and B together, A and C together, B and C together, and/or A, B, and C together, etc.). It will be further understood by those within the art that virtually any disjunctive word and/or phrase presenting two or more alternative terms, whether in the description, claims, or drawings, should be understood to contemplate the possibilities of including one of the terms, either of the terms, or both terms. For example, the phrase “A or B” will be understood to include the possibilities of “A” or “B” or “A and B.”

In addition, where features or aspects of the disclosure are described in terms of Markush groups, those skilled in the art will recognize that the disclosure is also thereby described in terms of any individual member or subgroup of members of the Markush group.

While various aspects and embodiments have been disclosed herein, other aspects and embodiments will be apparent to those skilled in the art. The various aspects and embodiments disclosed herein are for purposes of illustration and are not intended to be limiting, with the true scope and spirit being indicated by the following claims.

REFERAL NUMERALS:
Particulars Reference number
Radiator fan motor 1
Electronic control unit 2
Power source 3
Coil 4
Latch 5
Cooling units 25
Load switching circuit 50
System 100
Terminals of coil A’, B’
Terminals of relay C’, D’
Common electric ground G
Plurality of relays R1to Rn
First relay R1
Second relay R2
Third relay R3
Plurality of sensors P1 to Pn
First sensor P1
Second sensor P2
Third sensor P3
Terminals T1-T4