KR20130137303A - Motor driving apparatus and method for fuel pump - Google Patents

Abstract

The present invention relates to an apparatus and a method for operating a fuel pump motor. The invention comprises a motor driving unit, a pressure sensing unit, an over-speed sensing unit, a communication unit, and a control unit. The motor driving unit drives a motor installed in a fuel pump. The pressure sensing unit senses the pressure of fuel being supplied to an engine and pumped by the fuel pump. The over-speed sensing unit senses the over-speed by detecting the angle of an accelerator pedal placed in a vehicle. The communication unit receives signals for sensing the over-speed and the target pressure of the fuel being supplied to the engine from a main controller of the vehicle. The control unit controls the motor driving unit to prevent the fuel pressure from decreasing due to engine load by determining the over-speed on the basis of the signals for sensing the over-speed, and changes the driving speed of the motor based on the pressure sensed by the pressure sensing unit and the target pressure received from the communication unit. [Reference numerals] (10) Main controller;(11) Fuel pump;(12) Motor;(13) High pressure pump;(14) Injector;(15) Over-speed sensing unit;(20) Apparatus for operating a fuel pump motor;(21) Control unit;(22) Pressure sensing unit;(AA) Fuel supply

Description

 Fuel pump motor driving device and driving method {MOTOR DRIVING APPARATUS AND METHOD FOR FUEL PUMP}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel pump motor driving apparatus and a driving method thereof, and more particularly to a fuel pump motor driving apparatus and a driving method for controlling driving of a fuel pump motor for supplying fuel to an engine will be.

In general, the gas fuel stored in the fuel tank is supplied to the engine using a fuel pump in a vehicle using gas as fuel.

At this time, the amount of gas supplied to the engine is controlled by controlling the rotational speed of the pump in consideration of the speed of the vehicle.

The motor that drives the fuel pump uses a brushless DC motor for high efficiency, long life and reliability, and in particular, a sensorless BLDC motor is used.

In recent years, a lot of research and development has been carried out to improve the fuel efficiency of automobiles.

The present applicant discloses a fuel pump motor driving device technology capable of precisely controlling the rotational speed of a fuel pump motor to improve fuel efficiency of a vehicle. Korean Patent Registration No. 10-0649355 (November 27, 2006, Patent Document 1 ') and the like has been registered.

The fuel pump motor driving apparatus according to Patent Document 1 directly drives the fuel pump motor by directly switching the power supply voltage of the automobile supplied from the power supply unit, thereby improving the responsiveness of the motor to the set rotational speed, .

However, the fuel pump motor driving apparatus according to Patent Document 1 receives the PWM duty value received from the ECU dividedly, and drives the motor at a preset speed according to the input duty value.

That is, as the fuel pump motor driving apparatus according to Patent Document 1 controls the driving of the fuel pump motor in accordance with the PWM control signal of the ECU according to the engine RPM of the vehicle, There was a limit in precisely controlling the fuel pressure.

Accordingly, the fuel pump motor driving apparatus according to Patent Document 1 increases the power consumption of the motor due to unnecessary driving of the fuel pump motor, pumps excessively fuel, is injected from the engine, and the amount of fuel remaining in the vehicle is increased. There was a problem that the fuel economy is lowered.

On the other hand, the fuel pump motor driving apparatus according to the prior art, when the fuel consumption due to the instantaneous increase of the engine load in the acceleration section of the vehicle during the variable control of the fuel pressure increases rapidly, from the fuel pump to the engine by driving the fuel pump motor In the fuel supply line for supplying fuel, a decrease in fuel pressure occurs.

At this time, since the fuel pressure is formed by the fuel pump drive, the reaction speed is very slow.

Therefore, even if the fuel pump motor driving apparatus according to the related art senses the actual fuel pressure of the fuel supply line and feedback-controls the driving of the fuel pump motor in accordance with the detection signal, the fuel pressure drop occurs in the acceleration state of the vehicle, There is a problem that the output of the photodetector decreases.

Republic of Korea Patent Registration No. 10-0649355 (announced 27 November 2006)

The present invention is to solve the above problems, it is an object of the present invention to provide a fuel pump motor drive device for controlling the driving of the fuel pump motor based on the actual fuel pressure of the fuel supply line.

Another object of the present invention is to provide a fuel pump motor drive device and a drive method for controlling the fuel pressure supplied to the engine based on the acceleration state of the vehicle to a predetermined target pressure to prevent the fuel pressure from being lowered according to the engine load .

It is still another object of the present invention to provide a fuel pump motor drive apparatus and a drive method that can prevent a decrease in engine output due to a decrease in fuel pressure of a vehicle to which a fuel pump is applied.

According to a feature of the present invention for achieving the above object, the present invention is a motor drive unit for driving a motor provided in the fuel pump, a pressure sensing unit for sensing the fuel pressure supplied to the engine pumped by the fuel pump, Acceleration state detection unit for detecting the acceleration by detecting the angle of the accelerator pedal provided in the vehicle, communication means for receiving the target pressure and acceleration state detection signal of the fuel supplied to the engine from the main control unit of the vehicle and the communication means The driving speed of the motor is changed based on the received target pressure and the detected pressure sensed by the pressure sensing unit, and the acceleration state is determined based on the acceleration state detection signal to prevent the fuel pressure from being lowered according to the engine load. A control unit for controlling a driving unit, wherein the control unit is based on a difference between the detected pressure and the target pressure. The duty value is calculated, a switching signal based on the PWM control signal set to the calculated duty value is output, and the PWM control signal applied to the motor driver in the acceleration state is set upward to a preset target duty value.

The acceleration state detecting unit outputs a 'high' signal when the accelerator pedal is operated from an idle state to a partial state according to a hysteresis characteristic and exceeds a preset upper threshold angle, and operates the accelerator pedal. When the change from the partial state to the idle state so as to be less than the preset lower limit angle is characterized in that for outputting a 'low' signal.

The control unit generates a switching signal based on the PWM control signal, and transmits the high and low side driving unit to the MOSFET element provided on the high side and low side of the motor driving unit, the protection element of the motor driving unit when driving the motor A reverse voltage prevention circuit for driving on and off driving the protection element when a reverse voltage is generated, and a current detecting unit detecting a current of a driving power supplied to the motor driving unit, wherein the overcurrent is generated according to the current value detected from the current detecting unit. And controlling the motor driver to stop driving of the motor driver.

The motor driving unit is a three-phase full bridge circuit having a field effect transistor element on the high side and the low side, respectively, and a protection device that cuts off the power applied to the motor driving unit by turning off based on a control signal of the controller when a reverse voltage is generated. Characterized in that it comprises a.

According to another feature of the invention, the present invention comprises the steps of (a) the initial drive by supplying the drive power supplied from the battery of the vehicle when the engine is started by the ignition key operation to the fuel pump motor, (b) the accelerator pedal provided in the vehicle Detecting an acceleration state by detecting an angle of the vehicle; (c) receiving a target pressure for driving a fuel pump and an acceleration state detection signal detected in step (b) from a main control unit of the vehicle; determining whether to accelerate based on the acceleration state detection signal received in step (c), and driving the motor by setting the duty value of the PWM control signal applied to the motor driver in the acceleration state to a preset target duty value. Include.

The present invention is (e) detecting the pressure of the fuel pumped from the fuel pump by the motor driving in the step (a) to be supplied to the engine, (f) the detection pressure of the step (e) and the step (c) Computing a duty value of the PWM control signal based on the comparison result of the target pressure received in the step characterized in that it further comprises the step of controlling the drive speed of the motor based on the calculated duty value.

In step (d), the duty value calculated in step (f) is compared with the target duty value in the acceleration state (d1), and (d2) As a result of the comparison in step (d1), the calculated duty value is If the target duty value is smaller than the target duty value, setting the duty value of the PWM control signal to the target duty value and (d3) the comparison result of the step (d2) results in the calculated duty value being greater than the target duty value. In this case, it characterized in that it comprises the step of setting the duty value of the PWM control signal to the calculated duty value.

As described above, the present invention determines the acceleration state according to the change of the angle of the accelerator pedal, and sets the duty value of the PWM control signal applied to the motor driver in the acceleration state to a predetermined target duty value.

Accordingly, the present invention can effectively prevent the lowering of the fuel pressure due to the engine load, thereby preventing the lowering of the engine output.

In addition, the present invention can be controlled to compare the detected pressure of the pressure sensing unit installed in the fuel supply line with the target pressure received from the main control unit of the vehicle, and to change the driving speed of the motor according to the comparison result.

Accordingly, the present invention has the effect of improving fuel economy of the vehicle by precisely controlling the amount of fuel supplied to the engine by maintaining a constant fuel pressure in the fuel supply line with a minimum fuel pump driving.

1 is a block diagram of an ELFI system to which a fuel pump motor driving apparatus according to a preferred embodiment of the present invention is applied;
Figure 2 is a graph showing the detection signal characteristics of the acceleration state detection unit according to the change in the angle of the accelerator pedal,
3 is a configuration diagram of a fuel pump motor driving device shown in FIG.
FIG. 4 is a flowchart illustrating a method of driving a fuel pump motor driving apparatus according to a preferred embodiment of the present invention.

Hereinafter, a fuel pump motor driving apparatus and a driving method according to a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

In this embodiment, description will be made using a fuel pump motor applied to a system of Liquefied Petroleum Injection (hereinafter referred to as " Elpia ") system.

The Elpie System is a gas fuel system developed to improve the fuel efficiency of a gas fueled vehicle, and is configured to supply gaseous fuel in a liquid state to the engine, and to recover the remaining gaseous fuel injected from the engine back into the bomb.

1 is a block diagram of an ELPAI system to which a fuel pump motor driving apparatus according to an exemplary embodiment of the present invention is applied, and FIG. 3 is a configuration diagram of a fuel pump motor driving apparatus shown in FIG. 1.

The ELPIA system to which the fuel pump motor driving device is applied according to an exemplary embodiment of the present invention includes a fuel pump for pumping fuel stored in a cylinder, a fuel supply line for supplying fuel pumped by the fuel pump to a high pressure pump and an injector of an engine, And a regulator for maintaining the pressure of the gaseous fuel recovered through the fuel recovery line and the fuel recovery line for returning the remaining gaseous fuel injected from the engine back to the cylinder.

As shown in FIG. 1, the Elpia system performs communication with the main control unit 10 and the main control unit 10 for calculating a target pressure of the fuel supplied to the engine based on the driving state of the vehicle. Fuel pump motor driving device 20 for comparing the target pressure received from the 10 and the actual detected pressure in the fuel supply line and controls the driving speed of the motor 12 provided in the fuel pump 11 according to the comparison result And a high pressure pump 13 for pressurizing the fuel pumped by the fuel pump 11 to a predetermined high pressure and an injector 14 for injecting the fuel pressurized with the high pressure into the cylinder of the engine.

In particular, the fuel pump motor driving device 20 inspects the change in the acceleration state of the vehicle according to the detection signal transmitted from the acceleration state detecting unit 15 through the main control unit 10, and the fuel of the fuel supply line in the vehicle acceleration state. Feed forward control is performed to drive the motor 12 to a preset PWM duty value to prevent pressure drop.

Here, the acceleration state detection unit 15 is provided with an acceleration pedal sensor (Acceleration Pedal Sensor) for detecting the angle of the accelerator pedal when the driver's accelerator pedal operation, the acceleration pedal sensor is a detection signal for detecting the angle of the accelerator pedal Transfer to the main control unit 10.

For example, as shown in FIG. 2, the acceleration state detecting unit 15 operates the accelerator pedal from an idle state to a partial state so that a predetermined upper threshold angle, for example, 30 is used. If it exceeds °, it outputs 'high' signal.

On the other hand, the acceleration state detection unit 15 outputs a 'low' signal when the accelerator pedal operation is stopped to change from the partial state to the idle state such that the predetermined lower limit angle, for example, less than 20 °.

That is, the detection signal of the acceleration state detection unit 15 outputs an output value according to the hysteresis characteristic.

1 and 3, the fuel pump motor driving device 20 generates a control signal to drive the motor 12 according to the target pressure and the acceleration state detection signal received from the main controller 10. The control unit 21 and the pump 12 from the fuel pump 11 by the driving of the motor 12 to detect the pressure of the fuel supplied through the fuel supply line according to the control signal of the control unit and the control unit 21 And a motor driver 23 for driving the motor 12.

In addition, the fuel pump motor driving device 20 includes an overvoltage protection unit 24 for protecting each device by stably maintaining the driving power supplied from the battery 16 and blocking the overvoltage, and the main control unit 10 and the control unit of the vehicle ( A CAN transceiver 25 that performs CAN communication between 21) and a CAN controller 26 that controls the operation of the CAN transceiver 25.

The motor driver 23 is a three-phase full bridge method using a field effect transistor (hereinafter, referred to as a 'FET') element, and supplies power to the motor 12. Switch.

For example, the three-phase full bridge circuit constituting the motor driver 23 has a P-channel metal oxide semiconductor FET (hereinafter referred to as 'MOSFET') on a high side and a low side, respectively. The device FET1 and the N-channel MOSFET device FET2 are applied.

In addition, in the present exemplary embodiment, the motor driver 23 further includes a protection element FET3 that blocks driving power applied to the motor driver 23 according to a control signal of the controller 21 when a reverse voltage is generated.

Accordingly, the present invention prevents short circuits inside the motor driving unit by cutting off the driving power applied to the motor driving unit by turning on the protection element under normal control and turning off the protection MOFFET element when a reverse voltage is generated. can do.

In particular, in the present embodiment, the control unit 21 is connected to the voltage regulator 31 and the CAN controller 26 for converting the driving power supplied through the overvoltage protection unit 24 to the voltage level required for driving the control unit 21. And a sensing signal of the voltage output circuit 33 and the pressure sensing unit 22 for outputting the interface 32 which transmits and receives a signal, and outputs the driving power whose voltage level is converted from the voltage regulator 31 to the pressure sensing unit 22. It includes an analog to digital converter (Analog to Digital Converter, hereinafter referred to as 'ADC') for converting an analog signal to a digital signal.

In addition, the control unit 21 generates a switching signal according to the PWM control signal, and transmits the high and low side drivers 35 and 36 to the MOSFET devices FET1 and FET2 provided on the high and low sides of the motor driver 23. To the reverse voltage prevention circuit 37 and the motor driver 23 which normally protects the motor driver 23 by driving the protection element FET3 of the motor driver 23 on and driving the protection element FET3 off when a reverse voltage is generated. And a current detector 38 for detecting a current of the supplied driving power.

That is, the present invention configures the control unit as a single integrated circuit, and provides a high voltage regulator, an interface, a current detector, a reverse voltage prevention circuit, and a high and low side driving part serving as a motor controller. It is possible to simplify the size of the control unit.

Here, the interface 32 is an SPI bus performing SPI (Serial Peripheral Interface) communication between the CAN controller 26 and the controller 21.

In addition, the interface may further include a communication line (not shown) for transmitting and receiving a signal between the main control unit and the control unit in a PWM communication method.

Accordingly, the present invention can transmit and receive signals between the main control unit and the control unit via CAN communication, and continuously drive the motor using PWM communication when a CAN communication error occurs.

The current detector 38 detects a current when driving the fuel pump by using a resistor installed on a power supply line for supplying driving power to the motor driving unit 23 through the overvoltage protection unit 24.

Accordingly, the controller 21 checks whether the driving power source is overcurrent, and controls to stop the driving of the motor 12 when the overcurrent occurs, thereby preventing failure of the motor and the motor driving unit due to the overcurrent.

The control unit 21 configured as described above compares the target pressure received from the main control unit 10 with the detected pressure detected by the pressure detecting unit 22 through the CAN transceiver 25, and according to the comparison result, The drive of the motor drive unit 23 is controlled using the PWM control signal calculated by calculating the duty value.

In addition, the control unit 21 when the acceleration state according to the acceleration pedal detection signal received from the main control unit 10 via the CAN transceiver 25 changes from an idle to a partial state, the pressure detection unit 22 Compare the duty value of the PWM control signal calculated according to the detected signal with the target target value.

As a result of the comparison, when the calculated duty value of the PWM control signal is smaller than the target duty value, the controller 23 controls the driving of the motor 12 by setting the duty value of the PWM control signal upward to a preset target duty value. .

The target duty value may be set to about 50%.

On the other hand, the controller 23 does not set the duty value of the PWM control signal downward when the calculated duty value of the PWM control signal is larger than the target duty value.

Accordingly, the present invention determines whether or not the acceleration pedal is operated by the driver in real time to determine whether to accelerate, and in the acceleration state to drive the motor in accordance with the PWM control signal is set up to the target duty value of the motor provided in the fuel pump The pressure drop of the fuel supply line can be prevented.

Next, a method of driving a fuel pump motor driving apparatus according to an exemplary embodiment of the present invention will be described in detail with reference to FIG. 4.

FIG. 4 is a flowchart illustrating steps of a method for driving a fuel pump motor driving apparatus according to a preferred embodiment of the present invention.

The driving method of the fuel pump motor driving apparatus according to the preferred embodiment of the present invention starts when the ignition key (not shown) is operated and the driving power is supplied from the battery 16 to start the engine (S10).

At this time, the control unit 21 receives the driving power and starts driving. At the same time, the control unit 21 calculates the duty value to drive the motor 12 of the fuel pump 11 at the preset initial driving speed, And outputs a PWM control signal.

Then, the high and low side drivers 35 and 36 in the controller 21 generate a switching signal according to the PWM control signal to drive the motor 12 at the initial driving speed.

The pressure sensing unit 22 senses the pressure of fuel supplied to the engine through the fuel supply line by the fuel pump 11 during the initial operation of the motor 12 (S11).

The CAN transceiver 25 communicates with the main control unit 10 and receives the target pressure from the main control unit 10 in step S12 and transmits the target pressure to the interface 32 of the control unit 21 in the SPI communication method.

Then, the control unit 21 compares the sensed pressure and the target pressure (S13). If the sensed pressure is equal to or greater than the target pressure, the control unit 21 stops driving the motor (S14) Repeat the process.

On the other hand, if it is determined in step S13 that the sensed pressure is lower than the target pressure, the control unit 21 controls the driving speed of the motor 12 to increase the pressure of the fuel supplied through the fuel supply line.

That is, the control unit 21 calculates the duty value of the PWM control signal based on the difference between the target pressure and the sensing pressure (S15), and generates the PWM control signal of the calculated duty value.

Then, the high and low side drivers 35 and 36 generate a switching signal in response to the PWM control signal and transmit the switching signal to the MOSFET elements FET1 and FET2 provided on the high and low sides, respectively, to drive the motor by changing the driving speed.

In the present invention, a switching signal is applied to a MOSFET element of a motor driving unit using a high and a low side driving unit provided in an integrated circuit to drive the motor, and the duty ratio of the PWM control signal is changed to precisely Can be controlled.

As described above, the present invention can improve the fuel economy of the vehicle by optimizing the amount of fuel supplied to the engine by precisely controlling the driving speed of the motor.

In addition, the present invention can reduce the power consumption required for driving the motor by minimizing unnecessary driving of the motor, and improve the durability of the fuel pump and the motor by shortening the driving time of the fuel pump.

On the other hand, when the driving power of the battery 16 is applied in step S10, the acceleration state detecting unit 15 detects the change in the angle of the accelerator pedal according to the accelerator pedal operation of the driver (S17).

That is, in FIG. 2, the acceleration state detecting unit 15 is in an acceleration state in which the accelerator pedal is operated to change from an idle state to a partial state (S18), and the angle of the accelerator pedal exceeds a predetermined upper limit angle, for example, 30 °. Outputs a high signal as it changes.

Then, the main controller 10 checks whether the acceleration state detection unit 15 has a failure according to the detection signal of the acceleration state detection unit 15, and when the acceleration state detection unit 15 operates normally, the CAN communication line The detection signal is transmitted to the fuel pump motor driving device 20 through the fuel cell.

Accordingly, the control unit 21 receives the detection signal of the acceleration state detecting unit 15 to the main control unit 10 through the CAN transceiver 25, and calculates according to the detection signal of the pressure detecting unit 22 in step S15. The duty value of the PWM control signal is compared with a preset target duty value (S19).

As a result of the comparison, when the duty value calculated in step S15 is smaller than the target duty value, the controller 21 sets the duty value of the PWM control signal upward to the target duty value and transmits it to the motor driver 23.

Then, the motor driver 23 drives the motor 12 by switching according to the PWM control signal set upward from the controller 21 to the target duty value (S20).

Subsequently, the acceleration state detecting unit 15 stops the accelerator pedal operation and changes from the partial state to the idle state and releases the acceleration state (S21). The acceleration pedal angle is set to a predetermined lower limit angle, eg, less than 20 °. Outputs a low signal as it changes.

Then, the controller 21 sets the duty value of the PWM control signal to the duty value calculated according to the detection signal of the pressure sensor 22 in step S15 and transmits it to the motor driver 23, and the motor driver 23 The motor 12 is driven by switching according to the PWM control signal set to the calculated duty value (S22).

On the other hand, when the comparison result in step S19, the duty value calculated according to the detection signal of the pressure sensing unit 22 in step S15 is larger than the target duty value, the motor drive unit 23 proceeds to step S22 to the calculated duty value The switching operation is driven according to the set PWM control signal to drive the motor 12.

Accordingly, the present invention determines whether the vehicle is accelerated by using the change of the angle of the accelerator pedal, and sets the duty value of the PWM control signal applied to the motor driver in the acceleration state to drive the motor by setting the duty value higher than or equal to a preset target duty value. In addition, it is possible to prevent the fuel pressure drop on the fuel supply line due to the engine load.

On the other hand, the reverse voltage prevention circuit 37 turns on the protection element (FET3) when the control section 21 is driven in step S10, and then the control section 21 determines whether a reverse voltage is generated in the process of driving the motor 12 .

As a result of the inspection, when a reverse voltage is generated, the control unit 21 stops the PWM control signal generation operation and the reverse voltage prevention circuit 37 turns off the protection element (FET3) of the motor drive unit 23. [

Accordingly, in the present invention, when a reverse voltage is generated, the protection element is turned off to prevent reverse voltage from being applied to the inside of the motor driving unit, thereby preventing a short circuit inside the motor driving unit.

Subsequently, the control unit 21 controls to perform steps S11 to S23 repeatedly until the ignition key is turned off in step S23.

If the ignition key is turned off, as the engine driving is stopped and the driving power is cut off, the control unit 21 ends the driving of the fuel pump motor driving device 20.

Through the above process, the present invention compares the detected pressure of the pressure sensing unit installed in the fuel supply line with the target pressure received from the main control unit of the vehicle, and controls to change the driving speed of the motor according to the comparison result In addition, the acceleration state is determined according to the change of the angle of the accelerator pedal, and in the acceleration state, the duty value of the PWM control signal applied to the motor driving unit is set upward to a preset target duty value to prevent a decrease in fuel pressure due to the engine load.

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.

In the above embodiment, but described using the Elpia system, the present invention is not necessarily limited thereto.

That is, the present invention may be modified to be applied to various fuel supply systems for supplying gasoline fuel or diesel fuel, as well as a gas fuel supply system for supplying gaseous fuel in a liquid state, such as an Elpiai system or an Elpdiai system.

In addition, in the above embodiment, but described using a BLDC motor applied to the fuel pump, the present invention is not necessarily limited thereto, and may be modified to apply a DC motor to the fuel pump.

The present invention is applied to the field of precisely controlling the fuel pressure supplied to the engine by applying the fuel pump using the fuel pump to the vehicle to supply the engine through the fuel supply line.

10: main control unit 11: fuel pump
12: motor 13: high pressure pump
14: injector 15: acceleration state detection unit
16: battery
20: fuel pump motor drive device 21: control unit
22: pressure sensing unit 23: motor drive unit
24: Overvoltage Protection 25: CAN Transceiver
26: CAN controller 31: voltage regulator
32: interface 33: voltage output circuit
34: ADC 35: high side drive
36: low side driver 37: reverse voltage prevention circuit
38:

Claims (7)

A motor driver for driving a motor provided in the fuel pump;
A pressure sensing unit which senses the fuel pressure supplied to the engine by being pumped by the fuel pump;
Acceleration state detection unit for detecting the acceleration by detecting the angle of the accelerator pedal provided in the vehicle,
Communication means for receiving a target pressure and acceleration state detection signal of the fuel supplied to the engine from the main control unit of the vehicle;
Lowering the fuel pressure according to the engine load by changing the driving speed of the motor based on the target pressure received through the communication means and the detected pressure detected by the pressure sensing unit, and determining the acceleration state based on the acceleration state detection signal. The control unit for controlling the motor drive to prevent the;
The controller calculates a duty value based on the difference between the detected pressure and the target pressure, outputs a switching signal based on a PWM control signal set to the calculated duty value, and outputs a PWM control signal applied to the motor driver in an acceleration state. A fuel pump motor drive apparatus, characterized in that the upward setting to a predetermined target duty value. The method of claim 1,
The acceleration state detector outputs a 'high' signal when the accelerator pedal is operated from an idle state to a partial state according to a hysteresis characteristic and exceeds a preset upper threshold angle, and operates the accelerator pedal. The fuel pump motor drive apparatus, characterized in that for outputting a 'low' signal when the state is changed from the partial state to the idle state to be less than the predetermined lower limit angle. 3. The apparatus according to claim 1 or 2, wherein the control unit
A high and low side driving unit generating a switching signal based on the PWM control signal and transferring the switching signal to a MOSFET device provided at each of the high and low sides of the motor driving unit;
A reverse voltage prevention circuit for driving the protection device on the motor driving part when the motor is driven and off driving the protection device when a reverse voltage is generated;
Further comprising a current detecting unit for detecting the current of the driving power supplied to the motor driving unit,
And controlling the motor driving unit to stop driving of the motor driving unit when an overcurrent occurs according to the current value detected from the current detecting unit. The method of claim 3, wherein the motor drive unit
A three-phase full bridge circuit having field effect transistor elements on the high side and the low side, respectively;
And a protection device for turning off the power applied to the motor driving unit based on a control signal of the control unit when a reverse voltage is generated. (a) initial driving by supplying driving power supplied from the battery of the vehicle to the fuel pump motor when the engine is started by the ignition key;
(b) checking the acceleration state by detecting the angle of the accelerator pedal provided in the vehicle,
(c) receiving a target pressure for driving the fuel pump from the main control unit of the vehicle and an acceleration state detection signal detected in step (b);
(d) determining whether to accelerate based on the acceleration state detection signal received in step (c), and setting the duty value of the PWM control signal applied to the motor driver in the acceleration state upwardly to a preset target duty value. A fuel pump motor driving method comprising the step of driving. The method of claim 5,
(e) sensing the pressure of the fuel pumped from the fuel pump and supplied to the engine by driving the motor in step (a),
(f) calculating the duty value of the PWM control signal based on a result of comparing the detected pressure in step (e) with the target pressure received in step (c), and controlling the driving speed of the motor based on the calculated duty value. A fuel pump motor driving method further comprising the step of. 7. The method of claim 6, wherein step (d)
(d1) comparing the duty value calculated in step (f) with the target duty value in an accelerated state;
(d2) setting the duty value of the PWM control signal upwardly to the target duty value when the calculated duty value is smaller than the target duty value as a result of the comparison in step (d1); and
(d3) setting a duty value of the PWM control signal as the calculated duty value when the calculated duty value is greater than the target duty value as a result of the comparison in the step (d2). How to drive fuel pump motor.

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