KR101330323B1 - Water pump driving apparatus for engine cooling - Google Patents

Abstract

The present invention relates to an engine cooling water pump driving apparatus and a driving method thereof, comprising: motor driving means for driving a water pump driving motor, a power supply unit for supplying a constant power of a battery to the motor driving means, and communicating with a main control unit of a vehicle The communication unit for receiving a control signal for controlling the driving of the motor by performing the operation, the temperature sensing unit for detecting the temperature of the coolant and the coolant temperature detected by the temperature sensing unit when the engine is driven is greater than the first reference temperature set in advance. And a controller for driving the motor based on the signal and controlling the motor driving means to drive the motor until the coolant temperature is lower than the second reference temperature when the engine is stopped.
By using the above-described engine cooling water pump driving apparatus and its driving method, the water pump is driven until the temperature of the coolant is lowered below the preset reference temperature by driving the motor using the constant power of the battery when the engine stops. Keep it running

Description

WATER PUMP DRIVING APPARATUS FOR ENGINE COOLING}

The present invention relates to an engine cooling water pump driving apparatus, and more particularly, to an engine cooling water pump driving apparatus for controlling the driving of the water pump circulating the cooling water to maintain the engine within a preset reference temperature range. .

The temperature of the combustion gas which burns in the cylinder of an engine at the time of vehicle running becomes a high temperature state about 2000 degreeC or more.

A significant amount of the heat of the combustion gas is absorbed by the cylinder head and piston of the engine, resulting in heat loss, leading to overheating of the engine.

Accordingly, in the engine, problems such as deformation of the cylinder or poor lubrication may occur. In severe cases, the engine may be damaged, or the combustion may be poor, and the output of the engine may be reduced.

On the other hand, if the engine temperature is too low, there is a problem that the fuel consumption is increased as the thermal efficiency of the engine is lowered.

Therefore, in order to prevent overheating and overcooling of the engine, conventionally, the cooling water is forcedly circulated by using a mechanical water pump system to maintain the temperature of the engine in the reference temperature range.

1 is a block diagram of a mechanical water pump system according to the prior art.

As shown in Figure 1, the mechanical water pump system according to the prior art is a water pump for pumping operation to forcibly circulate the cooling water along the conduit (1), the conduit (1) formed in the cylinder block and the head (B, H) (2), a radiator (3) for performing heat exchange between the coolant absorbing heat from the cylinder block and the heads (B, H) and air, a cooling fan (4) for introducing external air into the radiator (3), a cylinder The coolant may be selectively radiated to the radiator 3 or the bypass line according to the temperature of the engine and the bypass conduit 5 for circulating the coolant inside the block and the head B and H back to the cylinder block and the head B and H. 5) a thermostat 6 that opens and closes to deliver.

Mechanical water pump system according to the prior art configured as described above is the cooling water of the cylinder block and the head (B, H) to the bypass pipe (5) by the closing operation of the thermostat (6) at the initial start of the engine temperature is low To pass.

Accordingly, the mechanical water pump system according to the prior art can quickly increase the temperature of the engine.

On the other hand, when the temperature of the engine rises to a predetermined reference temperature, the mechanical water pump system according to the prior art delivers the coolant to the radiator 3 by the opening operation of the thermostat 6.

Accordingly, the mechanical water pump system according to the prior art forcibly circulates the cooling water to cool the engine.

Here, the mechanical water pump system according to the prior art maintains the engine in a preset reference temperature range by adjusting the circulation amount of the cooling water according to the opening rate of the thermostat 6 according to the temperature of the engine.

On the other hand, the mechanical water pump system according to the prior art connects the water pump 2 and the crankshaft with the belt 7 to drive the water pump 2 using the driving force of the engine.

Thus, the mechanical water pump system according to the prior art stops the operation of the water pump 2 when the vehicle stops starting after the vehicle is driven.

Therefore, the mechanical water pump system according to the prior art has a problem that the piston is fixed inside the cylinder by increasing the engine temperature by the latent heat of the engine as the operation of the water pump 2 stops at the same time as the engine start stop.

The present invention is to solve the problems as described above, an object of the present invention is to provide an engine cooling water pump driving apparatus for cooling the engine using an electric water pump driven by the power of the battery.

Another object of the present invention is to provide an engine cooling water pump driving apparatus for maintaining an engine in a preset reference temperature range using an electric water pump.

Still another object of the present invention is to provide an engine cooling water pump driving apparatus for cooling an engine by driving an electric water pump regardless of engine starting.

According to a feature of the present invention for achieving the above object, the present invention provides a motor driving means for driving a water pump driving motor, a power supply unit for supplying the constant power of the battery to the motor driving means, the vehicle A communication unit receiving a control signal for controlling the driving of the motor by communicating with a main controller, a temperature sensing unit sensing a temperature of cooling water, and a coolant temperature detected by the temperature sensing unit when the engine is driven; And a controller for controlling the motor driving means to drive the motor based on the control signal, and to drive the motor until the coolant temperature is lower than the second reference temperature when the engine is stopped.

The second reference temperature is set lower than the first reference temperature.

The water pump driving device is installed on one side of the water pump, characterized in that formed in a structure integrated with the water pump.

According to another feature of the invention, the present invention comprises the steps of (a) communicating with the main control unit of the vehicle when the engine starts receiving a drive RPM message of the water pump driving motor, (b) detecting and detecting the temperature of the coolant Driving the motor based on the motor driving RPM message when the coolant temperature is higher than the first predetermined reference temperature; and (c) detecting the temperature of the coolant when the engine driving is terminated and setting the detected coolant temperature. It characterized in that it comprises a step of driving the motor using the constant power of the battery until it is lower than the reference temperature.

The second reference temperature is set to a temperature lower than the first reference temperature.

As described above, the present invention can continuously operate the electric water pump by driving the motor using the constant power of the battery when the engine stops driving.

Therefore, according to the present invention, by continuously operating the water pump until the temperature of the coolant is lowered below the preset reference temperature regardless of whether the engine is driven, it is possible to prevent the piston and the like from being stuck by the latent heat of the engine.

As a result, the present invention prevents heat loss and overheating of the engine by maintaining the temperature of the engine in a preset reference temperature range, and removes the cause of damaging the engine such as deformation of the cylinder due to overheating and poor lubrication. Durability can be improved.

According to the present invention, since the water pump and the water pump driving device are formed in an integrated structure, the distance between the motor and the control circuit of the water pump driving device is short, thereby minimizing the length of wires and cables for transmitting signals and power. It can reduce the effects of Electro Magnetic Compatibility (EMC).

1 is a block diagram of a mechanical water pump system according to the prior art.
Figure 2 is a block diagram of a water pump driving apparatus for engine cooling according to an embodiment of the present invention.
3 is a view showing the position and structure of the water pump shown in Figure 2 installed in the engine.
4 is a plan view of the water pump.
5 is a flowchart illustrating a step-by-step method of driving an engine cooling water pump driving apparatus according to a preferred embodiment of the present invention.

Hereinafter, an engine cooling water pump driving apparatus and a driving method thereof according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In the present embodiment, the configuration of the engine to which the water pump driving apparatus for engine cooling is applied will be described using the configuration of the engine shown in FIG. 1.

Therefore, in the present embodiment, the same reference numerals are given to the same parts as those shown in FIG. 1, and different configurations will be described in detail.

Figure 2 is a block diagram of a water pump driving apparatus for engine cooling according to a preferred embodiment of the present invention, Figure 3 is a view showing the position and structure of the water pump shown in Figure 2 installed in the engine, Figure 4 is a water Top view of the pump.

As shown in FIG. 2, the engine cooling water pump driving apparatus 20 according to an exemplary embodiment of the present invention is a motor for driving a water pump 30 driving motor (hereinafter, abbreviated as 'motor') 31. The power supply unit 22 receives the constant power of the driving unit 21, the battery 11, and supplies the motor driving unit 21 to the motor driving unit 21, the communication unit 23 communicating with the main control unit 12 of the vehicle, and the engine. The motor 31 of the motor 31 is based on the control signal received from the main control unit 12 through the temperature sensing unit 24 and the communication unit 23 sensing the temperature of the cooling coolant and the temperature detected by the temperature sensing unit 24. And a control unit 25 for generating a control signal for controlling the driving.

The installation position and structure of the water pump 30 and the water pump driving device 20 will be described in detail with reference to FIGS. 3 and 4 below.

The motor 31 is provided with a sensorless three-phase brushless DC motor.

Of course, the motor 31 may be changed into various motors such as a sensored three-phase brushless DC motor or a single-phase DC motor.

The motor driving means 21 is based on the duty value of the PWM control signal applied from the motor driver (not shown) and the controller 25 for driving the motor 31 by switching the power supplied from the battery 11 of the vehicle. A motor controller (not shown) for outputting a motor driving signal and a field effect transistor (hereinafter referred to as FET) driver for outputting a switching signal to a switching element of the motor driving unit based on the motor driving signal ( Not shown).

The motor driving unit is formed in a three-phase full bridge method using an FET device, and switches driving power applied to the motor 31.

For example, P-channel metal oxide semiconductor FETs (hereinafter referred to as 'MOSFETs') on the high side and low side of the three-phase full bridge circuit constituting the motor driver. ) And N-channel MOSFET devices.

The motor controller outputs a three-phase motor driving signal according to the duty value of the PWM control signal output from the controller 25.

The FET driver applies a switching signal according to the three-phase motor drive signal to the gate terminal of the FET device provided in the motor driver.

The power supply unit 22 receives the constant power and the ignition key input power from the battery 11 of the vehicle and supplies them to the motor driving means 21, the communication unit 23, and the control unit 25.

The constant power is always supplied regardless of whether the ignition key is on or off, and the power supply unit 22 is a driving power source for driving the motor when the engine stops driving. Supplies).

The ignition key input power is a power supplied only when the ignition key is turned on. The control unit 25 receives the ignition key input power and controls the communication unit 23 to communicate with the main control unit 12 of the vehicle. Know your driving status.

The communication unit 23 is a CAN transceiver that performs control area network (CAN) communication with the main control unit 12 of the vehicle. The communication unit 23 receives the motor driving RPM message transmitted from the main control unit 12 according to the driving state of the engine and controls the control unit ( 25, and transmits a diagnostic signal of the water pump driving device 20 transmitted from the control unit 25 to the main control unit 12.

The temperature detector 24 is a temperature sensor for sensing the temperature of the coolant introduced into the water pump 30, and transmits a detection signal corresponding to the detected temperature of the coolant to the controller 25.

The controller 25 sets the target RPM of the motor 31 according to the motor drive RPM message received from the main controller 12 through the communication unit 23, and sets a duty value for driving the motor at the set target RPM. The PWM control signal having the set duty value is output to the motor driving means 21 to control the driving of the motor 31.

 If the coolant temperature according to the detection signal of the temperature sensing unit 24 is higher than the preset first reference temperature in the state in which the driving of the motor 31 is stopped when the engine is started, the controller 25 sets the motor 31 as the target. Outputs a PWM control signal of the duty value set to drive at RPM.

When the ignition key is turned off and the ignition key input power is cut off, the controller 25 determines that the engine is stopped.

Accordingly, the control unit 25 drives the motor 31 in the state in which the control to drive the motor 31 until the coolant temperature according to the signal of the temperature sensing unit 24 is lower than the preset second reference temperature, When the temperature is lower than the second reference temperature, the driving of the motor 31 is stopped.

The first and second reference temperatures are temperatures set by an experimental value to prevent overheating of the engine when the engine is actually driven, and the second reference temperature is to prevent the piston and the like from sticking to the latent heat of the engine when the engine is stopped. It is preferable to set lower than the first reference temperature.

To this end, the controller 25 includes various programs for driving the water pump driving apparatus 20 and a memory (not shown) for storing the first and second reference temperatures.

In the present embodiment, the first reference temperature is set to about 80 ° C, and the second reference temperature is set to about 60 ° C.

Therefore, the present invention stops the driving of the water pump before the temperature of the coolant rises to the first reference temperature when starting the engine, and drives the cylinder block and head of the engine by driving the water pump when the temperature of the coolant is higher than the first reference temperature. The engine is cooled and the engine is cooled by driving the water pump until the temperature of the coolant drops below the second reference temperature even when the engine is stopped.

Next, the installation position and structure of the water pump and the water pump driving apparatus will be described in detail with reference to FIGS. 3 and 4.

3 and 4, the control unit 25 of the engine cooling water pump 30 and the water pump driving apparatus 20 according to a preferred embodiment of the present invention is installed on one side of the engine.

In particular, as shown in Figure 3, the engine to which the water pump driving device 20 according to the present embodiment is applied, the water pump is mechanically driven by being connected to the thermostat 6, the crankshaft and the belt of the prior art ( 2) is removed and formed in the cylinder block and the head (B, H), the conduit (1) through which the coolant is circulated, the water pump (30), which is electrically driven using the power of the battery (11), the radiator (3), The cooling fan 4 and the bypass conduit 5 are provided.

As shown in FIG. 4, the water pump 30 includes a pumping part 32 that pumps using power generated by the motor 31, and a heat dissipation part that emits heat to cool the water pump 30 itself. And a connector 34 to which a cable for receiving control signals and power from the main control unit 12 and the battery 11 of the vehicle is connected.

At the lower end of the pumping part 32, heat is discharged from the radiator, and an inlet 35 through which the cooled coolant is introduced is formed, and at one side of the pumping part 32, the coolant pumped by the pumping part 32 is discharged to the engine. A discharge port 36 is formed, and a temperature sensor 25 is installed inside the pumping part 32 to detect the temperature of the cooling water introduced through the inlet 35.

And one side of the water pump 30 is provided with a control unit 25 of the water pump drive device 20 for controlling the driving of the motor (31).

As such, according to the present invention, since the water pump and the water pump driving device are formed in an integrated structure, the distance between the motor and the control circuit of the water pump driving device is short, thereby minimizing the length of wires and cables for transmitting signals and power. Reduce the vehicle's Electro Magnetic Compatibility (EMC) impact.

Next, a method of driving an engine cooling water pump driving apparatus according to an exemplary embodiment of the present invention will be described in detail with reference to FIG. 5.

5 is a flowchart illustrating a step-by-step method of driving an engine cooling water pump driving apparatus according to an exemplary embodiment of the present invention.

As shown in FIG. 5, the driving method of the water pump driving apparatus for engine cooling according to the preferred embodiment of the present invention is operated by turning on an ignition key (not shown) while a constant power is supplied from the battery 11. In operation S10, the ignition key input power is supplied from the battery 11 to the power supply 22.

When the ignition key input power is supplied, the controller 25 performs initialization to operate the water pump driving device 20, and continuously communicates with the main controller 12 through the communication unit 23 to drive the motor RPM. Receive a message (S11).

Subsequently, the controller 25 controls the temperature detector 24 to detect the temperature of the coolant in the driving stop state S12 of the motor 31.

Then, the temperature detector 24 detects the temperature of the coolant stored in the pumping unit 32 of the fuel pump 30 (S13), and transmits a detection signal according to the detected coolant temperature to the controller 25.

The controller 25 compares the coolant temperature according to the detection signal with the first reference temperature preset to 80 ° C. (S14).

If the comparison result of step S14 shows that the coolant temperature is equal to or less than the first reference temperature, the control unit 25 proceeds to step S12 and stops driving the motor 31 until the coolant temperature rises to the first reference temperature. Keep it.

On the other hand, if the temperature of the engine and the coolant is increased by driving the engine and the coolant temperature is higher than the first reference temperature as a result of the comparison in step S14, the controller 25 is received from the main controller 12 through the communication unit 23. The target RPM of the motor 31 is set according to the motor driving RPM message (S15).

The controller 25 outputs the PWM control signal of the duty value calculated by calculating the duty value to drive the motor 31 at the set target RPM, and the motor driving means 21 controls the PWM. The driving of the motor 31 is controlled according to the signal (S16).

Accordingly, the temperature of the engine and the coolant is maintained in a preset reference temperature range.

On the other hand, the motor drive control of step S16 is performed by a control logic pre-programmed to control whether the motor is driven, the drive speed, etc. according to the driving state of the vehicle, a detailed description thereof will be omitted.

When driving the engine, the control unit 25 checks whether the ignition key input power is cut off while driving the motor 31 to circulate the coolant to the radiator 3 by the pumping operation of the water pump 30 to cool the engine (S17). ).

That is, when the ignition key input power is cut off as the ignition key is turned off at the end of driving of the vehicle, the controller 25 senses the temperature of the coolant in the state in which the motor 31 is driven (S18). ) Is controlled (S19).

The temperature detector 24 detects the temperature of the coolant and transmits a detection signal to the controller 25, and the controller 25 compares the coolant temperature according to the detected signal with a second reference temperature set to 60 ° C. (S20). ).

As a result of the comparison in step S20, when the coolant temperature is equal to or greater than the second reference temperature, the controller 25 proceeds to step S18 and outputs a PWM control signal to continuously drive the motor 31.

Then, the motor driving means 21 drives the motor 31 by switching the constant power supplied through the power supply 22 according to the PWM control signal.

Accordingly, when the temperature of the coolant is higher than the preset second reference temperature, the present invention continuously drives the water pump driving motor using the constant power of the battery to prevent seizure of the piston due to latent heat of the engine. do.

On the other hand, when the comparison result of step S20, when the coolant temperature is lower than the second reference temperature, the controller 25 controls the motor driving means 21 to stop the driving of the motor 31, the water pump driving device 20 Ends the operation.

Through the above process, the present invention continuously operates the water pump until the temperature of the coolant is lowered below the preset reference temperature by driving the motor using the constant power of the battery when the engine stops driving.

Although the present invention has been described in detail with reference to the above embodiments, it is needless to say that the present invention is not limited to the above-described embodiments, and various modifications may be made without departing from the spirit of the present invention.

11: battery 12: main control unit
20: water pump drive device 21: motor drive means
22: power supply unit 23: communication unit
24: temperature detection unit 25: control unit
30: water pump 31: motor
32: pumping part 33: heat dissipation part
34: connector 35: inlet
36: outlet

Claims (5)

Motor driving means for driving a water pump driving motor,
A power supply unit which receives the constant power of the battery and the ignition key input power and supplies it to the motor driving means;
A communication unit configured to communicate with a main control unit of a vehicle to receive a control signal for controlling driving of the motor;
Temperature sensing unit for detecting the temperature of the coolant and
If the coolant temperature sensed by the temperature sensing unit when the engine is driven is greater than or equal to a predetermined first reference temperature, the motor is driven based on the control signal, and when the engine is stopped, the second coolant temperature is set lower than the first reference temperature. And a control unit for controlling the motor driving means to drive the motor until the temperature is lower than the reference temperature.
The control unit is an engine cooling water pump driving apparatus, characterized in that formed on the one side of the water pump so as to minimize the distance to the motor and integrated with the water pump. delete delete delete delete

Images