KR101458985B1 - Motor driving apparatus and method for fuel pump - Google Patents

Abstract

The present invention relates to a fuel pump motor drive device and a drive method thereof, and more particularly, to a fuel pump motor drive device and a drive method thereof, including a pressure sensing part for sensing a pressure of fuel pumped from a fuel pump by a fuel pump motor, A control unit for generating a control signal for driving the motor based on the target pressure and the acceleration state sensing signal and the sensing signal of the pressure sensing unit, and a motor driving unit for driving the motor based on the control signal of the control unit .
By using the fuel pump motor driving device and the driving method as described above, whether or not the accelerator pedal is operated by the driver is checked in real time to calculate the rate of change of the acceleration state. Whether or not the calculated rate of change of the acceleration state is maintained for a predetermined time The target duty value of the PWM control signal can be set up in the acceleration state.

Description

TECHNICAL FIELD [0001] The present invention relates to a motor driving apparatus,

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.

Generally, fuel stored in a fuel tank in a vehicle using gasoline, diesel, or gaseous fuel is supplied to the engine using a fuel pump.

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 BLDC motor (Brushless DC Motor) to ensure high efficiency, long service life and reliability, and it is common to use a sensorless BLDC motor in particular.

Recently, many researches and developments have been made to improve the fuel efficiency of automobiles.

The applicant of the present invention has proposed a fuel pump motor drive device technology capable of improving the fuel economy of an automobile by precisely controlling the rotational speed of the motor for fuel pump is disclosed in Korean Patent Registration No. 10-0649355 (published on Nov. 27, 2006, Patent Document 1 ").

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, .

Korean Patent Registration No. 10-0649355 (published on November 27, 2006)

However, the fuel pump motor driving apparatus according to Patent Document 1 receives the duty value of the PWM control signal received from the ECU, receives the duty value, and drives the motor at a predetermined speed according to the duty value inputted.

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, increases the amount of fuel that is injected from the engine and is recycled, There is a problem that the fuel consumption is lowered.

On the other hand, in the fuel pump motor driving apparatus according to the related art, when the fuel consumption amount due to an instantaneous engine load increase in the acceleration period of the vehicle is rapidly increased under the variable control of the fuel pressure, The fuel pressure in the fuel supply line for supplying fuel is lowered.

At this time, since the fuel pressure is formed by driving the fuel pump, 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.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fuel pump motor drive apparatus and a drive method for controlling drive of a fuel pump motor based on actual fuel pressure of a 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.

In order to achieve the above object, a fuel pump motor driving apparatus according to the present invention is a fuel pump motor driving apparatus which includes a fuel pump motor for driving a fuel pump, A control unit for generating a control signal to drive the motor based on a target pressure and an acceleration state sensing signal received from the main control unit of the vehicle and a sensing signal of the pressure sensing unit and a motor for driving the motor based on the control signal of the control unit, And a driving unit.

The control unit includes a sensed signal value sampling unit for sampling a sensed signal value per a predetermined sampling time using the acceleration state sensing signal received from the main control unit, and compares the sampled current sensed signal value with a previous sensed signal value to calculate an acceleration state change rate A duty ratio calculator for calculating a duty ratio of the PWM control signal based on the sensing signal of the pressure sensing unit, A duty value comparing unit for comparing the duty value of the PWM control signal calculated when it is determined to be in the acceleration state with a target duty value, and a duty value comparing unit for comparing the duty value of the PWM control signal calculated according to the comparison result of the duty value comparing unit with a target duty value And a duty value setting unit for setting the duty value.

The present invention further includes a CAN transceiver for performing CAN communication between the main control unit and the control unit of the vehicle, wherein the duty value setting unit sets the duty value of the PWM control signal when the duty value of the PWM control signal is smaller than the target duty value, The target duty value is set to the target duty value.

The duty value calculator compensates the duty value of the PWM control signal using the compensation voltage mapped to the target pressure received from the main control unit through the CAN transceiver and the applied voltage applied from the battery of the vehicle.

In order to achieve the above object, a method of driving a fuel pump motor according to the present invention includes the steps of: (a) supplying driving power supplied from a battery of a vehicle by an ignition key operation to a fuel pump motor, (C) sensing the change in the angle of the accelerator pedal according to the accelerator pedal operation of the driver in the acceleration state sensing unit provided in the vehicle, (d) detecting the fuel pressure supplied to the engine through the fuel supply line, ) Receiving a target pressure for driving the fuel pump from the main control part of the vehicle and an angle change of the accelerator pedal sensed in step (c); and (e) comparing the fuel pressure sensed in step (b) (D) determining whether the vehicle is accelerated based on the change in the angle of the accelerator pedal received in the step (d) And controlling the driving of the motor by setting a duty value of the PWM control signal to be controlled.

(E1) sampling a sensed signal value per a predetermined sampling time using the acceleration state sensing signal received from the main control unit (10); (e2) (E3) determining whether the acceleration is in an acceleration state or not according to whether the change rate calculated in the step (e2) is maintained for a predetermined time or longer, (e4) Comparing the duty value of the PWM control signal calculated using the fuel pressure sensed in step (b3) and the target duty value in step (e3); and (e5) comparing the duty value of the PWM And setting the duty value of the calculated PWM control signal to a predetermined target duty value when the duty value of the control signal is smaller than the target duty value.

In the step (e4), the duty value of the PWM control signal is compensated using the compensation voltage mapped to the target pressure received from the main control unit and the applied voltage applied from the battery of the vehicle.

As described above, according to the fuel pump motor driving apparatus and the driving method of the present invention, it is possible to check whether or not the accelerator pedal is operated by the driver in real time to calculate the rate of change of the acceleration state, The target duty value of the PWM control signal can be set up in the acceleration state.

Thus, according to the fuel pump motor driving apparatus and the driving method of the present invention, it is possible to prevent the pressure drop of the fuel supply line by driving the motor in accordance with the duty value of the PWM control signal upward.

According to the fuel pump motor driving apparatus and the driving method of the present invention, the duty value of the PWM control signal is compensated by using the driving voltage applied to the battery and the compensation voltage corresponding to the target pressure, By generating the PWM control signal having the duty value, the fuel pump can be stably driven.

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;
2 is a configuration diagram of a fuel pump motor driving apparatus according to a preferred embodiment of the present invention,
3 is a graph illustrating a process of calculating an acceleration state change rate using a sensing signal output from the acceleration state sensing unit,
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 preferred embodiments 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.

However, the present invention is not necessarily limited to this, and may be applied to a variety of fuel supply systems such as a gas fuel supply system or a diesel direct injection system for supplying a gaseous fuel in a liquid state, such as an Elpia system or an Elpidia system, It should be noted that

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.

Generally, the ELF system includes a fuel pump for pumping fuel stored in the cylinder, a fuel supply line for supplying the fuel pumped by the fuel pump to the high-pressure pump and the injector of the engine, And a regulator for maintaining the pressure of the gaseous fuel recovered through the fuel recovery line at a preset pressure.

As shown in FIG. 1, the ELFIA system to which the fuel pump motor driving apparatus according to the preferred embodiment of the present invention is applied includes a main controller 10 for calculating a target pressure of fuel supplied to the engine based on the running state of the vehicle And communicates with the main control unit 10 to compare the target pressure received from the main control unit 10 with the actually sensed sensed pressure in the fuel supply line and outputs the detected sensed pressure to the motor 12 A high-pressure pump 13 which pressurizes the fuel supplied by the fuel pump 11 to a predetermined high pressure, a high-pressure pump 13 which pressurizes the high- An injector 14 injected into the vehicle, and an acceleration state sensing unit 15 sensing an acceleration state of the vehicle.

The acceleration state sensing unit 15 is provided as an acceleration pedal sensor that senses the angle of the accelerator pedal when the driver operates the accelerator pedal. The accelerator pedal sensor senses the acceleration state sensing signal that senses the angle of the accelerator pedal To the main control unit (10).

The configuration of a fuel pump motor pump driving apparatus according to a preferred embodiment of the present invention applied to such an ELFI system will be described in detail with reference to FIGS. 2 and 3. FIG.

FIG. 2 is a configuration diagram of a fuel pump motor driving apparatus according to a preferred embodiment of the present invention, and FIG. 3 is a graph illustrating a process of calculating an acceleration state change rate using a sensing signal output from the acceleration state sensing unit.

The fuel pump motor driving apparatus 20 calculates the rate of change of the acceleration state using the sensing signal transmitted from the acceleration state sensing unit 15 through the main control unit 10, and when the calculated rate of change of the acceleration state is equal to or greater than a preset reference value, Feed forward control so as to drive the motor 12 to a preset PWM duty value so as to prevent the fuel pressure of the fuel supply line from being lowered in the acceleration state.

1 and 2, the fuel pump motor driving apparatus 20 is pumped from the fuel pump 11 by driving the fuel pump motor 12 and supplied to the high-pressure pump 13 through the fuel supply line A pressure sensing unit 22 for sensing the pressure of the fuel that is supplied from the main control unit 10 of the vehicle and a target pressure and acceleration sensing signal received from the vehicle main control unit 10 and a sensing signal of the pressure sensing unit 22, And a motor driving unit 23 for driving the motor 12 in accordance with the control signal of the control unit 21. [

In addition, the fuel pump motor driving apparatus 20 includes an overvoltage protection unit 24 for stably maintaining the driving power supplied from the battery 16 and blocking overvoltage to protect each device, a main control unit 10 A CAN transceiver 25 for performing CAN communication between the control unit 21 and a CAN controller 26 for controlling the operation of the CAN transceiver 25. [

The control unit 21 compares the target pressure received from the main control unit 10 with the sensing pressure sensed by the pressure sensing unit 22 through the CAN transceiver 25 and calculates the duty value of the PWM control signal according to the comparison result And controls the driving of the motor driving unit 23 using the PWM control signal thus calculated.

The control unit 21 includes a sensed signal value sampling unit 41 for sampling a sensed signal value per predetermined sampling time using the acceleration state sensing signal received from the main control unit 10 through the CAN transceiver 25, An acceleration state determination unit 43 for determining whether or not the acceleration state is determined according to whether the calculated change rate is maintained for a predetermined set time or longer, A duty value calculator 44 for calculating a duty value of the PWM control signal using the sensing signal of the pressure sensing unit 22, and a duty value calculator 44 for comparing the duty value of the PWM control signal calculated in the acceleration state and the target duty value And a duty value setting unit 46 for setting the duty value of the PWM control signal calculated according to the comparison result of the duty value comparing unit 45 and the duty value comparing unit 45 as a target duty value.

In FIG. 3, the sampling time? T at which the detection signal value sampling unit 41 performs sampling may be set to about 10 ms.

The set time for determining the acceleration state in the acceleration state determiner 43 may be set to about 40 ms longer than the sampling time so as to prevent malfunction due to disturbance.

The duty value calculator 44 calculates the duty ratio of the PWM control signal using the compensation voltage mapped to the target pressure received from the main control unit 10 via the CAN transceiver 25 and the applied voltage from the battery 16, Value may be compensated.

The duty value setting unit 46 sets the calculated duty value of the PWM control signal to a predetermined target duty value when the calculated duty value of the PWM control signal is smaller than the target duty value.

Here, the target duty value may be set to about 50%.

Meanwhile, the duty value setting unit 46 does not set the duty value of the PWM control signal down when the calculated duty value of the PWM control signal is equal to or greater than the target duty value.

Accordingly, the present invention determines whether the accelerator pedal is operated by a driver in real time, calculates an acceleration state change rate, determines whether or not the accelerator pedal is accelerated according to whether the calculated acceleration state change rate is maintained for a predetermined time, The target duty value of the PWM control signal is set up.

Accordingly, the present invention can prevent the pressure drop of the fuel supply line by driving the motor according to the duty value of the PWM control signal.

2, the control unit 21 includes a voltage regulator 31 for converting the driving power supplied through the overvoltage protection unit 24 into a voltage level required for driving the control unit 21, A voltage output circuit 33 for outputting the driving power from which the voltage level is converted from the voltage regulator 31 to the pressure sensing unit 22 and a pressure sensing unit 22 (Hereinafter referred to as ADC) for converting the detection signal from the analog signal to the digital signal.

The control unit 21 includes high and low side drivers 35 and 36 for generating a switching signal according to the PWM control signal and transmitting the switching signal to the MOSFET devices FET1 and FET2 provided on the high and low sides of the motor driver 23, A reverse voltage prevention circuit 37 for protecting the motor drive unit 23 by turning on the protection element FET3 of the motor drive unit 23 and driving the protection element FET3 off when a reverse voltage is generated, And a current detector 38 for detecting the current of the supplied driving power.

That is, according to the present invention, the control unit is constituted by one integrated circuit, and the high and low side driving units serving as a voltage regulator, an interface, a current detecting unit, a reverse voltage preventing circuit and a motor controller are provided in the integrated circuit, The size of the control unit can be reduced.

Here, the interface 32 is an SPI bus that performs 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 signals between the main control unit and the control unit in a PWM communication manner.

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

The current detection unit 38 detects a current when the fuel pump is driven by using a resistor provided on a power supply line that supplies driving power to the motor driving unit 23 through the overvoltage protection unit 24. [

Accordingly, the control unit 21 checks whether the drive power source is overcurrent, and stops the drive of the motor 12 when an overcurrent is generated, thereby preventing the failure of the motor and the motor drive unit due to the overcurrent.

The motor driving unit 23 is a three-phase full bridge type using a field effect transistor (hereinafter, referred to as FET) Lt; / RTI >

For example, a high-side and a low-side of a three-phase full-bridge circuit constituting the motor driver 23 are respectively connected to a P-channel metal-oxide semiconductor FET (FET1) and an N-channel MOSFET device (FET2) can be applied.

The motor driving unit 23 may further include a protection element FET3 for blocking the driving power applied to the motor driving unit 23 according to a control signal of the control unit 21 when a reverse voltage is generated.

Accordingly, according to the present invention, the protection element is normally turned on under the control of the control unit, the protection MOFFET element is turned off when a reverse voltage is generated, and the driving power applied to the motor driving unit is cut off to prevent short- can do.

Referring now to FIG. 4, a method of driving a fuel pump motor driving apparatus according to a preferred embodiment of the present invention will be described in detail.

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.

The duty value calculator 44 of the control unit 21 calculates the duty value of the PWM control unit 20 using the compensation voltage mapped to the target pressure received from the main control unit 10 via the CAN transceiver 25 and the applied voltage applied from the battery 16. [ The duty value of the signal can be compensated.

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.

Further, the present invention minimizes driving of unnecessary motors, thereby reducing power consumption required for driving the motor and shortening the driving time of the fuel pump, thereby improving the durability of the fuel pump and the motor.

Also, the present invention compensates the duty value of the PWM control signal by using the driving voltage applied to the battery and the compensation voltage according to the target pressure to generate the PWM control signal having the accurate duty value regardless of the change in the driving voltage of the battery, Can be stably driven.

If the driving power of the battery 16 is applied in step S10, the acceleration state sensing unit 15 senses the change in the angle of the accelerator pedal according to the driver's accelerator pedal operation (S17).

At this time, the main control unit 10 checks whether or not a failure of the acceleration state sensing unit 15 occurs according to a sensing signal of the acceleration state sensing unit 15. When the acceleration state sensing unit 15 operates normally, And transmits the acceleration state detection signal to the fuel pump motor drive device 20 via the line.

The control unit 21 receives the detection signal of the acceleration state sensing unit 15 from the main control unit 10 through the CAN transceiver 25 and the sensing signal value sampling unit 41 of the control unit 20 controls the CAN The sensed signal value per sampling time is sampled using the acceleration state sensing signal received from the main control unit 10 via the transceiver 25 (S18).

Subsequently, the change rate calculator 42 calculates the rate of change of the acceleration state by comparing the sampled current sense signal value with the previous sense signal value (S19).

The acceleration state determiner 43 determines whether the calculated acceleration is in the acceleration state or not (S20), based on whether the calculated change rate is maintained for a preset time, for example, about 40 ms or longer.

If it is determined in step S20 that the acceleration state is determined, the duty value comparator 45 compares the duty value of the PWM control signal calculated using the sensing signal of the pressure sensor 22 with the target duty value.

If it is determined in step S20 that the calculated duty value of the PWM control signal is smaller than the target duty value, the duty value setting unit 46 sets the calculated duty value of the PWM control signal to a predetermined target duty value, (23).

Then, the motor driving unit 23 performs switching operation according to the PWM control signal set up to the target duty value from the control unit 21 to drive the motor 12 (S22).

When the accelerator pedal operation is stopped and the accelerator pedal operation is stopped and the accelerator pedal is changed from the partial state to the idle state and the accelerated state is released (S21), the accelerator pedal angle is set to a lower limit angle And outputs a low signal as it changes.

In step S23, the control unit 21 checks whether or not the accelerator pedal operation is stopped and the acceleration state is released, and controls to repeat steps S21 to S23 until the acceleration state is released.

If the acceleration state is canceled in step S23, the control unit 21 sets the duty value of the PWM control signal to the duty value calculated in step S15 and transmits the duty value to the motor driving unit 23. [

Accordingly, the motor driving unit 23 performs the switching operation in accordance with the PWM control signal set to the duty value calculated in step S15, and drives the motor 12 (S24).

On the other hand, if it is determined in step S20 that the calculated duty value of the PWM control signal is equal to or greater than the target duty value, the duty value setting unit 46 maintains the duty value of the PWM control signal as it is, Lt; RTI ID = 0.0 > S24. ≪ / RTI >

Accordingly, the motor driving unit 23 performs the switching operation in accordance with the PWM control signal set to the calculated duty value, thereby driving the motor 12.

Accordingly, the present invention detects a change in the angle of the accelerator pedal to determine whether the vehicle is accelerating, sets a duty value of a PWM control signal applied to the motor driving unit in an acceleration state to a predetermined target duty value or more, , It is possible to prevent the fuel pressure on the fuel supply line from being lowered 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.

In step S25, the control unit 21 controls the steps S11 to S25 to be repeated until the ignition key is turned off.

If the ignition key is turned off, the control unit 21 stops driving the fuel pump motor driving apparatus 20 and terminates as the engine operation is stopped and the driving power is shut off.

According to the present invention, the sensing pressure of the pressure sensing unit installed in the fuel supply line is compared with the target pressure received from the main control unit of the vehicle, and the driving speed of the motor is changed according to the comparison result The duty of the PWM control signal applied to the motor driving unit in the acceleration state is set to a predetermined target duty value to detect a decrease in the fuel pressure due to the engine load prevent.

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.

That is, in the above-described embodiment, the fuel pump motor applied to the ELFI system has been described. However, the present invention is not limited thereto, and the present invention is not limited thereto. For example, Such as a gas fueling system or a diesel direct injection system.

The present invention relates to a fuel pump motor driving device and a driving method thereof, which control the pressure of fuel supplied to an engine based on an acceleration state of a vehicle to be maintained at a predetermined target pressure to prevent a decrease in fuel pressure, Methodology.

10: main controller 11: fuel pump
12: motor 13: high pressure pump
14: Injector 15: Acceleration state sensing unit
16: Battery
20: fuel pump motor drive device 21:
22: Pressure sensing part 23: Motor driving part
24: Overvoltage protection section 25: CAN transceiver
26: CAN controller 31: voltage regulator
32: Interface 33: Voltage output circuit
34: ADC 35: High side driver
36: Low side driver 37: Reverse voltage prevention circuit
38:
41: detection signal value sampling unit 42: rate of change calculation unit
43: acceleration state determination unit 44: duty value calculation unit
45: duty value comparing unit 46: duty value setting unit

Claims (7)

A pressure sensing part 22 for sensing the pressure of fuel pumped from the fuel pump 11 by driving of the fuel pump motor 12 and supplied to the high pressure pump 13 through the fuel supply line,
A control unit (21) for generating a control signal to drive the motor (12) based on the target pressure and acceleration state sensing signal received from the main control unit (10) of the vehicle and the sensing signal of the pressure sensing unit (22)
And a motor driving unit (23) for driving the motor (12) based on a control signal of the control unit (21)
The control unit 21 determines whether the vehicle is in an acceleration state or not by using the acceleration state change rate calculated based on the sensed signal value obtained by sampling the acceleration state sensing signal. When the duty value of the PWM control signal calculated by comparing the duty value of the PWM control signal with the target duty value is smaller than the target duty value, And sets the duty value of the PWM control signal to the target duty value. 2. The apparatus according to claim 1, wherein the control unit (21)
A sensed signal value sampling unit 41 for sampling a sensed signal value per predetermined sampling time using the acceleration state sensing signal received from the main control unit 10,
A change rate calculator 42 for comparing the sampled current sensed signal value with the previous sensed signal value and calculating an acceleration state change rate,
An acceleration state determiner 43 for determining whether or not the acceleration is in an acceleration state according to whether the calculated change rate is maintained for a predetermined set time or longer,
A duty value calculating unit 44 for calculating a duty value of the PWM control signal using the sensing signal of the pressure sensing unit 22,
A duty value comparing unit 45 for comparing the duty value of the PWM control signal with the target duty value when it is judged to be in the acceleration state,
And a duty value setting unit (46) for setting the duty value of the PWM control signal calculated according to the comparison result of the duty value comparing unit (45) to a target duty value. delete 3. The method of claim 2,
The duty value calculator 44 calculates the duty value of the PWM control signal using the compensated voltage mapped to the target pressure received from the main control unit 10 through the CAN transceiver 25 and the applied voltage from the battery 16 of the vehicle And the duty value is compensated for. (a) initial driving by supplying driving power supplied from the battery of the vehicle to the fuel pump motor by the ignition key operation,
(b) sensing the fuel pressure pumped by the fuel pump and supplied to the engine via the fuel supply line,
(c) detecting an angle change of an accelerator pedal according to an operation of an accelerator pedal of a driver in an acceleration state sensing unit provided in the vehicle,
(d) receiving a target pressure for driving the fuel pump from the main control of the vehicle and an angle change of the accelerator pedal sensed in step (c); and
(e) determining whether the vehicle is accelerating based on the fuel pressure sensed in the step (b) and the angle of the accelerator pedal received in the step (d), and if it is determined that the accelerator pedal is accelerated, And controlling the drive of the motor by setting a duty value of a PWM control signal for controlling the drive of the motor based on the pressure,
In the step (e), when it is determined that the fuel pump is in the acceleration state, the duty value of the PWM control signal calculated using the fuel pressure sensed in the step (b) is compared with the target duty value. When the duty value is smaller than the target duty value, the duty value of the calculated PWM control signal is set to a predetermined target duty value. 6. The method of claim 5, wherein step (e)
(e1) sampling a sensed signal value per sampling time preset using the acceleration state sensing signal received from the main control unit 10,
(e2) calculating an acceleration state change rate by comparing a current sensed signal value sampled in the step (e1) with a previous sensed signal value; and
(e3) determining whether an acceleration state is determined based on whether the rate of change calculated in the step (e2) is maintained for a predetermined time or more. The method according to claim 6,
Wherein the step (e) compensates the duty value of the PWM control signal using the compensation voltage mapped to the target pressure received from the main control unit and the applied voltage applied from the battery of the vehicle.

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