KR20130056936A - Apparatus for motor drive control and control method thereof - Google Patents

Abstract

PURPOSE: A motor drive control apparatus f and a control method thereof are provided to detect the input or output voltage and the current of a motor for a fuel pump in real time, thereby facilitating fault diagnosis. CONSTITUTION: A voltage detection unit(20) and a current detection unit(21) detect the voltage and the current of driving power which is supplied by a power supply unit to a motor for a fuel pump. A voltage sensor senses voltage supplied by a voltage regulator to a pressure sensor. The pressure sensor senses the pressure of fuel which is pumped by the fuel pump. A central processing unit(18) controls a motor drive unit. [Reference numerals] (1) Main control unit; (10) Power supply unit; (11) Motor; (12) Motor driving unit; (13) Gate driving circuit; (14) Motor switching circuit; (15) Voltage regulator; (16) Communication unit; (17) Pressure sensor; (18) Central control device; (19) Schottky rectifier; (20) Voltage detection unit; (21) Current detection unit; (22) Voltage sensor; (23) Signal input unit; (24) Comparison unit

Description

Motor drive control device and control method thereof {APPARATUS FOR MOTOR DRIVE CONTROL AND CONTROL METHOD THEREOF}

The present invention relates to a motor drive control device and a control method thereof, and more particularly, to a motor drive control device and a control method for performing a failure diagnosis of the control device for controlling the drive of the motor for the fuel pump.

In general, in an automobile using gas as fuel, a gas pump stored in a fuel tank is supplied to an engine by using a fuel pump.

That is, the conventional fuel pump controller adjusts the amount of gas supplied to the engine by controlling the rotational speed of the fuel pump in consideration of the speed of the vehicle.

The fuel pump has a motor that generates a rotational force to pump gaseous fuel.

The present applicant is the Republic of Korea Patent Registration No. 10-885683 (published February 26, 2009, hereinafter referred to as' Patent Document 1 ') and 10-0894657 (published April 24, 2009, hereinafter' Patent Document 2 Has been registered and registered as a brush type DC motor drive control device.

Patent document 1 measures the revolutions per minute (rpm) of a brushed DC motor by using a counter electromotive force to maintain a constant flow rate supplied to the fuel pump, and diagnoses the abnormal state of the brushed DC motor and generates an alarm sound accordingly. Inform the user.

Patent document 2 measures the AlpM of the brush-type DC motor by using the current or back electromotive force supplied to the brush-type DC motor, and through this control the voltage supplied to the brush-type DC motor to maintain a set speed.

On the other hand, Patent Document 1 provides a function of controlling the motor drive, and the function of determining whether the motor is broken by using the presence or absence of overcurrent detection and the number of rotation of the motor, but the mechanical stop state of the motor and supplying power to the motor Whether the positive terminal or the negative terminal is shorted or whether the terminal is open has limitations in diagnosing various motor abnormalities.

In general, a vehicle includes an engine control unit (ECU), a motor control unit (MCU), a transmission control unit (TCU) as a control means. And the like ''.

However, Patent Literature 1 and Patent Literature 2 provide only a function of transmitting / receiving a PWM control signal using a TCU connection line provided with a hard wire between a TCU and a central processing unit of a vehicle, thereby providing a communication function with the other control apparatuses described above. However, even when diagnosing a fault in the oil pump motor, there was no way to deliver it to other control devices.

In addition, in the vehicle to which Patent Literature 1 and Patent Literature 2 are applied, there is a problem in that precise control of a motor for a fuel pump cannot be performed as the fuel driving controller detects the fuel pressure and controls the fuel device according to the sensed fuel pressure.

Republic of Korea Patent Registration No. 10-885683 (August 26, 2009) Republic of Korea Patent Registration No. 10-0894657 (April 24, 2009 announcement)

The present invention is to solve the above problems, an object of the present invention is to provide a motor drive control apparatus for performing a diagnosis by detecting the input and output voltage and current of the motor for a fuel pump and a control method thereof.

Another object of the present invention is to provide a motor drive control apparatus and a control method thereof for directly detecting a fuel pressure pumped from a fuel pump and diagnosing an abnormality of the fuel pump based on the detected fuel pressure.

It is still another object of the present invention to provide a motor drive control device and a control method thereof for diagnosing a failure of a fuel pump and a motor and notifying the other control device of the vehicle when a failure occurs.

According to a feature of the present invention for achieving the above object, the present invention is a motor drive control device having a power supply unit, a motor drive unit, a voltage regulator, a communication unit, the drive supplied from the power supply unit to the fuel pump motor Voltage sensor and current sensor for sensing the voltage and current of the power supply, voltage sensor for sensing the voltage supplied from the voltage regulator to the pressure sensor, pressure sensor for sensing the fuel pressure pumped by the fuel pump and the main through the communication unit And a central processing unit generating a control signal to control the motor driving unit based on a result of comparing the target pressure received from the control unit with the detected pressure detected by the pressure sensor, wherein the central processing unit detects the voltage when the motor is driven. Voltage sensing signal and current sensing signal of current and current sensing unit, output signal of the voltage sensor and pressure sensor Based on the pressure detection signal and controls the motor driving unit so as to check whether the voltage of the motor, a low voltage, over current, disconnection, breakage of the pressure sensor, a short circuit, the signal over and stop the driving of the motor from any error.

The communication unit is a CAN transceiver for performing CAN communication with the main control unit of the vehicle, the central processing unit compares the actual measured pressure by the target pressure and the pressure sensor to check whether the fuel pressure control failure, and the CAN transceiver The CAN time-out is checked according to whether or not a control signal is received, and the CAN bus is turned off according to whether a message transmission confirmation signal is received from the CAN transceiver a predetermined number of times.

The communication unit may further include a communication module for performing communication with the main control unit of the vehicle in a PWM manner.

The motor driving unit includes a gate driving circuit for generating a switching signal according to a control signal of the central processing unit, and a motor switching circuit for driving a motor by switching driving power based on the switching signal, and an output terminal of the gate driving circuit. A voltage dividing means is installed between the base potential line and the base potential line, and the motor driving controller further includes a comparing unit which compares a voltage level of a control signal input to the gate driving circuit with a voltage level of a switching signal output from the gate driving circuit. It is characterized by.

The first input terminal of the comparator is connected to the input terminal of the gate driving circuit, the second input terminal of the comparator is connected to a node provided between the output terminal of the gate driving circuit and the voltage dividing means, and the central processing unit The controller may perform a controller self-diagnostic function according to whether the voltage level of the control signal and the voltage level of the switching signal are the same.

According to another feature of the invention, the present invention (a) supplying the driving power from the power supply to the motor drive control device for driving the fuel pump motor when the engine is started by the ignition key operation, (b) the main of the vehicle Receiving a target pressure from the controller, (c) driving the motor by changing a duty value of the control signal based on the target pressure received in the step (b) and a sensed pressure detected by the pressure sensor, (d) Checking whether a failure occurs while driving the motor; and (e) stopping the driving of the motor and notifying the main controller of the failure, if it is determined that the failure occurs as a result of the inspection in the step (d). (d) step (d1) detecting the voltage and current of the driving power applied to the motor from the power supply, (d2) detecting the fuel pressure pumped by the fuel pump and (d3) the (d Based on the detection signal detected in steps 1) and (d2), the overvoltage, undervoltage, overcurrent, disconnection and short circuit of the motor, disconnection of the pressure sensor, short circuit, abnormality of the pressure sensor signal, and fuel pressure control failure Check it.

In the step (d3), if the voltage level of the pressure detection signal detected in the step (d2) is greater than the preset first set value, it is determined to be a high voltage state signal or more, and the preset second set value is smaller than the first set value. If it is smaller, it is determined that the low voltage signal is abnormal.

Step (d) is characterized in that it is determined that the failure occurs only when the signal corresponding to the failure state is maintained for a predetermined holding time.

In the step (d), (d4) comparing the voltage level of the signal input / output to the gate driving circuit of the motor driving unit generating the switching signal for driving the motor and performing the controller self-diagnosis (d5) the (d4) If the input and output signals are different from each other, it characterized in that it comprises the step of determining that the abnormality of the controller.

In the step (d), if the value obtained by subtracting the actual measured pressure in the step (d2) from the target pressure is greater than a preset limit range, it is determined that the fuel pressure control failure.

The step (d) is characterized in that it is determined as a steady state even if the value obtained by subtracting the target pressure from the actual measured pressure of the step (d2) is larger than the preset limit range.

The step (d) further includes the step (d6) of detecting the voltage of the power applied to the pressure sensor, and if the detected voltage level is less than the predetermined reference voltage value, determining that the pressure sensor voltage supply more than It is characterized by.

In step (d), if the control signal non-receipt state of the main controller is maintained for a preset holding time, the step (d) determines the CAN time-out state and (d8) transmits a message of the communication unit communicating with the main controller. If the confirmation signal is not received more than a predetermined number of times, characterized in that it further comprises the step of determining the state of the CAN time out.

As described above, the present invention can detect the current and the voltage applied to the fuel pump motor in real time to perform a troubleshooting.

In addition, the present invention may check whether the motor is disconnected or short-circuited by using the voltage applied to the pressure sensor and the input / output voltage of the motor driving unit, and perform the controller self-diagnosis.

In addition, the present invention can check whether the communication line error, disconnection or short circuit of the pressure sensor, abnormality of the pressure sensor signal, poor fuel pressure control, abnormality of the main control signal transmission.

As a result, the present invention inspects the occurrence of the failure of the motor drive control device in real time and stops the driving of the motor according to the inspection result, thereby preventing damage to each component and safety accident of the vehicle due to the failure of the motor drive control device. Has the effect of

1 is a block diagram of a motor drive control apparatus according to a preferred embodiment of the present invention;
2 is a failure diagnosis item table of the motor drive control device shown in FIG.
Figure 3 is a flow chart for explaining a step-by-step control method of the motor drive control apparatus according to an embodiment of the present invention.

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

1 is a block diagram of a motor drive control apparatus according to a preferred embodiment of the present invention, Figure 2 is a failure diagnosis item table of the motor drive control apparatus shown in FIG.

Motor driving control apparatus according to an embodiment of the present invention, as shown in Figure 1, the power supply unit 10 for applying the driving power to the fuel pump motor 11, switching the driving power to drive the motor 11 The motor driver 12 for driving, the voltage regulator 15 for converting the voltage level of the driving power source, the communication unit 16 for communicating with the main control unit 1 of the vehicle, the pressure of the fuel pumped by the fuel pump The control signal is supplied to the motor driver 12 to control the driving of the motor 11 based on a result of comparing the target pressure of the pressure sensor 17 and the main controller 1 with the detected pressure from the pressure sensor 17. Generating central processing unit 18;

The power supply unit 10 receives power from a battery (not shown) by manipulating an ignition key of the vehicle and supplies driving power to each device.

To this end, one output terminal of the power supply unit 10 is provided with a voltage regulator 15 for converting the voltage level of the power applied from the battery, for example 13.5V to the voltage level required for each device, for example 5V.

In addition, although the power supply unit 10 is not shown in FIG. 1, the power supply unit 10 may further include an EMC filter that removes EMC noise of a power source applied from a battery, and a reverse voltage prevention circuit that absorbs a high surge voltage to block reverse voltage. Can be.

And the motor provided in the fuel pump in this embodiment is a brush-type DC motor.

The communication unit 16 communicates with a main control unit of a vehicle such as an ECU in a control area network (CAN) communication or a pulse width modulation (PWM) communication method.

In the present embodiment, the communication unit 16 will be described using a case of a CAN transceiver for performing CAN communication.

However, the present invention is not necessarily limited thereto, and may be modified to selectively apply a communication module and a CAN transceiver that perform communication in various ways such as PWM communication.

For example, the present invention includes both a CAN transceiver and a PWM communication module, and when the CAN communication is normally performed, the target pressure is received from the main controller through the CAN transceiver.

If the CAN communication error occurs, the present invention receives the target pressure from the main control unit via PWM communication, PWM control having a duty value calculated according to the result of comparing the detected pressure detected by the target pressure and the pressure sensor It can also generate a signal to control the motor to drive continuously.

The motor driver 12 includes a gate driving circuit 13 generating a switching signal according to a control signal of the central processing unit 18 and a motor switching circuit 14 driving the motor 11 by switching driving power according to the switching signal. ).

That is, the gate driving circuit 13 generates a switching signal obtained by converting the voltage level of the control signal, for example, 5V, into the voltage level required for driving the motor switching circuit 14, for example, 13.5V.

The motor switching circuit 14 is composed of a field effect transistor (hereinafter referred to as a FET) element to switch the driving power applied to the motor 11.

In the motor switching circuit 14, a metal oxide semiconductor FET (hereinafter referred to as a “MOSFET”) device is applied to only the low side of the high side and the low side.

The CPU 18 generates a control signal for controlling the driving of the motor 11 by comparing the target pressure received through the communication unit 16 with the detected pressure detected by the pressure sensor.

For example, the central processing unit 18 outputs the duty value of the control signal at a preset minimum duty value, for example, about 1% when the sensing pressure is equal to or greater than the target pressure, and the duty of the control signal when the sensing pressure is lower than the target pressure. Output the value by increasing it to the current duty value.

In particular, the central processing unit 18, as shown in Figure 2, the overvoltage and undervoltage of the drive power applied to the motor 11, overcurrent, disconnection or short circuit of the motor 11, controller self-diagnosis, communication line error, Check for disconnection of the pressure sensor 17, short circuit of the pressure sensor 17, abnormality of the pressure sensor 17 signal, poor fuel pressure control, abnormality of the transmission signal of the main control unit 1, and drive of the motor 11 when an abnormality occurs. Control to stop.

To this end, between the power supply unit 10 and the motor 11 is provided with a voltage sensing unit 20 and a current sensing unit 21 for sensing the voltage and current of the driving power.

On the other hand, the pressure sensor 17 is applied from the voltage regulator 15 receives a drive power source voltage is converted.

Here, in order to check whether the pressure sensor 17 is abnormal, a voltage sensor 22 is provided between the pressure sensor 17 and the voltage regulator 15 to sense the voltage of the driving power applied to the pressure sensor 17. The signal input unit 23 is provided between the pressure sensor 17 and the central processing unit 18 to transmit a detection signal of the pressure sensor 17 to the controller.

In order to check whether an abnormality occurs in the central processing unit 18, a comparator 24 comparing the input terminal voltage and the output terminal voltage of the gate driving circuit 13 is provided.

Here, the input terminal of the gate driving circuit 13 is connected to the first input terminal of the comparator 24.

Between the first node N1 and the ground potential line GND provided at the output terminal of the gate driving circuit 13, a resistor R is provided as a voltage dividing means serving as a voltage divider, and a second input of the comparator 24 is provided. The terminal is connected to the second node N2 provided between the first node N1 and the resistor.

That is, the resistor R divides the output signal voltage level of the gate driving circuit 13 to be equal to the voltage level of the control signal input to the gate driving circuit 13.

Accordingly, the comparator 24 compares the voltage level of the control signal input through the first input terminal with the output signal voltage level of the gate driving circuit 13 input through the second input terminal, and compares the voltages of the two signals. If the levels are different, the central processing unit 18 is notified.

In addition, a Schottky rectifier 19 is provided between the motor driver 12 and the motor 11.

The Schottky rectifier 19 serves to protect the motor driver 12 by blocking back electromotive force generated from the motor 11 when the motor 11 is driven to the motor driver 12.

Next, with reference to Figure 3 will be described in detail a control method of a motor drive control apparatus according to an embodiment of the present invention.

3 is a flowchart illustrating a step-by-step control method of the motor drive control apparatus according to an embodiment of the present invention.

First, when the ignition key is operated to start the engine (S10), the power supply unit 10 supplies the driving power applied from the battery to each device (S11).

Then, the central processing unit 18 generates a control signal to drive the motor 11 at a predetermined initial drive speed, and the motor driver 12 drives the motor 11 by switching according to the control signal (S12). ).

The communication unit 16 performs a CAN communication with the main control unit 1 to receive a target pressure (S12), and the central processing unit 18 compares the received target pressure with a sensed pressure detected from the pressure sensor (S13). .

As a result of the comparison, when the detected pressure is equal to or higher than the target pressure, the central processing unit 18 generates a control signal having a predetermined minimum duty value, and the motor driver 12 switches the motor according to the control signal to drive the motor 11. (S15).

On the other hand, if the detected pressure is lower than the target pressure, the central processing unit 18 increases the duty value of the control signal than the current duty value to generate a control signal, and the motor driver 12 switches according to the control signal to operate the motor. (11) is driven (S16).

Accordingly, the present invention can maintain the pressure of the fuel pumped by the fuel pump to the target pressure of the main controller.

As such, while the motor 11 is being driven, the central processing unit 18 compares with the voltage sensing unit 20, the current sensing unit 21, the voltage sensor 22, the signal input unit 23, the communication unit 16, and the comparison. The failure is checked according to various signals transmitted from the unit 24 (S17).

If it is determined that a failure has occurred (S18), the CPU 18 controls to stop the driving of the motor 11 (S19).

At this time, the central processing unit 18 notifies the fact that the failure occurred to the main control unit 1 of the vehicle through the communication unit 16.

Accordingly, the present invention prevents the safety accident of the vehicle due to the failure of the motor drive control device by promptly informing the driver of the failure of the fuel pump and the motor, the pressure sensor, the central processing unit, the communication line.

If the check result of step S17 indicates that the operation is in normal operation, the CPU 18 checks whether the ignition key is turned off in step S20, and performs steps S12 to S20 until the ignition key is turned off. By repeating the steps to control the driving of the motor 11 continuously.

On the other hand, when the ignition key is turned off as a result of the inspection in step S20, the central processing unit 18 controls to end the driving of the motor drive control device.

Next, in step S17 to step S19 of FIG. 3 to check whether the failure occurs, and when the failure occurs, the control method is described in detail by dividing each failure item.

The CPU 18 checks the overvoltage and undervoltage of the driving power applied to the motor 11 by comparing the voltage sensing signal of the voltage sensing unit 20 with the preset maximum and minimum voltages, respectively.

For example, the maximum voltage is the maximum voltage that can be applied to the motor 11, and is set to about 18V in this embodiment.

The minimum voltage is a minimum voltage that can be applied to the motor 11, and is set to about 8V in this embodiment.

Accordingly, the central processing unit 18 determines that the voltage level of the voltage detection signal is an overvoltage if the voltage level of the voltage detection signal is kept larger than the maximum voltage for a predetermined first forward filtering time, and during the first holding time than the minimum voltage. If it is kept small, it is regarded as low voltage.

As such, when the overvoltage or undervoltage occurs, the central processing unit 18 controls the motor 11 to stop driving.

The CPU 18 checks the overcurrent, disconnection and short circuit of the motor 11 by comparing the current sensing signal of the current sensing unit 21 with a preset maximum current and minimum current.

The maximum current is the maximum current that can be applied to the motor 11, and is set to about 13 A in this embodiment.

The minimum current is the minimum current that can be applied to the motor 11, and is set to about 0.2 A in this embodiment.

Accordingly, the CPU 18 determines the overcurrent when the voltage level of the current sensing signal is greater than the maximum current for the first holding time, and determines that the motor is less than the minimum current for the first holding time. Judging from disconnection or short circuit in (11).

In this way, when an overcurrent, disconnection or short circuit of the motor 11 occurs, the central processing unit 18 controls to stop the driving of the motor 11.

The first holding time is a time set by an experimental value to prevent an error that is determined to be a failure when a voltage or current changes momentarily, and is set to about 1 second in this embodiment.

In addition, the central processing unit 18 checks whether the pressure sensor 17 is disconnected, short-circuited, a signal abnormality, and whether the fuel pressure control is poor, in accordance with the pressure detection signal of the pressure sensor 17, and detects the detection signal of the voltage sensor 22. Inspect whether the voltage supply supplied to the pressure sensor 17 is bad.

That is, the central processing unit 18 maintains the voltage level of the pressure sensing signal smaller than the preset minimum output voltage value for the second preset holding time and determines that the pressure sensor 17 is disconnected, and the preset maximum output If the value is kept larger than the voltage value for the second holding time, it is determined that the pressure sensor 17 is shorted.

Here, the minimum output voltage is the minimum voltage that the output signal of the pressure sensor 17 can have, it is set to about 0.3V in this embodiment.

The second holding time is a time set by an experimental value so as to prevent an error that is determined as a failure when a voltage or current changes momentarily, and is set to about 0.5 seconds in this embodiment.

The maximum output voltage is the maximum voltage that the output signal of the pressure sensor 17 can have, and is set to about 4.95V in this embodiment.

If disconnection or short circuit of the pressure sensor 17 occurs, the central processing unit 18 controls to stop the driving of the motor 11.

If the voltage level of the pressure sensing signal is maintained at a value greater than the first predetermined value, for example, about 4.5V, during the first holding time, the CPU 18 determines that the pressure sensor signal is higher than the high pressure state signal of the pressure sensor 17. When it is maintained at a value smaller than the second preset value of the pressure detection signal, for example, 0.5V, it is determined that the low pressure state signal of the pressure sensor 17 is abnormal.

If the high pressure state signal abnormality or the low pressure state signal abnormality of the pressure sensor 17 occurs, the central processing unit 18 controls to stop the driving of the motor 11.

In addition, the central processing unit 18 controls the fuel pressure when the target pressure is subtracted from the actual measured fuel pressure according to the pressure sensing signal and is maintained at a value larger than a preset limit range, for example, about 100 kPa during the third preset holding time. It judges that it is bad, and it controls so that the drive of the motor 11 may be stopped.

On the other hand, the central processing unit 18 controls the target pressure by the speed at which the actual measured pressure falls when the value obtained by subtracting the target pressure from the actual measured fuel pressure is maintained at a value greater than the preset limit range for the third holding time. Since it is slower than the speed to be determined, it is judged that it is in a normal operating state.

Here, the third holding time is a time set in advance by an experiment to determine whether or not the fuel pressure control failure, in this embodiment is set to about 2 seconds.

In addition, the central processing unit 18 sets a target pressure according to the control signal of the main controller received through the communication unit 16, and compares the set target pressure with a preset maximum reference pressure and minimum reference pressure to determine whether the control signal is abnormal. Check it.

Here, the maximum reference pressure and the minimum reference pressure are the maximum pressure and the minimum pressure of the fuel required to drive the vehicle normally, and are set to about 600 kPa and about 250 kPa in the present embodiment, respectively.

Accordingly, the central processing unit 18 determines that the target pressure is greater than the maximum reference pressure during the first holding time or is less than the minimum reference pressure and determines that the target pressure is greater than or equal to the control signal to drive the motor 11. Control to stop.

In addition, when the unreceived state of the control signal is maintained for the second holding time through the communication unit 16, the CPU 18 determines the CAN time-out state to drive the motor 11. Control to stop.

In addition, when the message transmission confirmation signal has not been received more than a predetermined number of times, for example, 256 times, from the communication unit 16, the CPU 18 determines that the CAN bus-OFF state is to drive the motor 11. Control to stop.

In addition, when the voltage level of the power supply detected by the voltage sensor 22 maintains a value smaller than the preset reference voltage value during the second holding time, the CPU 18 determines that the pressure sensor 17 voltage supply is abnormal. To stop the driving of the motor 11.

In addition, the central processing unit 18 performs a controller self-diagnostic function to check whether the central processing unit 18 itself is abnormal according to the output signal of the comparator 24.

Here, the comparator 24 compares the voltage level of the control signal input through the first input terminal with the output signal voltage level of the gate driving circuit 13 input through the second input terminal, so that the voltage levels of the two signals are increased. If it is the same, the value '0' is output. If they are different, the value '1' is output.

Accordingly, the central processing unit 18 controls the motor 11 to operate normally when the output value of the comparator 24 is '0', and if the output value of the comparator 24 is '1', a controller failure occurs. The determination is made so that the driving of the motor 11 is stopped.

Through the above process, the present invention is an overvoltage and undervoltage of the drive power applied to the motor, overcurrent, motor disconnection or short circuit, controller self-diagnosis, communication line error, pressure sensor disconnection or short circuit, pressure sensor signal error, Inspect the fuel pressure control failure, the main control unit transmission signal abnormality, and stop the driving of the motor in case of abnormality to prevent damage to each part due to the failure and safety accident of the vehicle.

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.

The present invention is an overvoltage and undervoltage of the driving power applied to the motor for the fuel pump, overcurrent, motor disconnection or short circuit, controller self-diagnosis, communication line error, pressure sensor disconnection or short circuit, pressure sensor signal abnormality, fuel pressure control failure, Applied to the field of checking whether the main control unit transmit signal is abnormal.

1: main control unit 10: power supply unit
11: motor 12: motor drive part
13: gate driving circuit 14: motor switching circuit
15: voltage regulator 16: communication unit
17: pressure sensor 18: central processing unit
20: voltage detector 21: current detector
22: voltage sensor 23: signal input
24: comparator

Claims (13)

In the motor drive control device having a power supply unit, a motor drive unit, a voltage regulator, a communication unit,
Voltage sensing unit and current sensing unit for detecting the voltage and current of the driving power supplied from the power supply to the fuel pump motor,
A voltage sensor for sensing the voltage supplied from the voltage regulator to the pressure sensor,
A pressure sensor for detecting fuel pressure pumped by the fuel pump;
And a central processing unit generating a control signal to control the motor driving unit based on a result of comparing the target pressure received from the main control unit with the sensing pressure detected by the pressure sensor through the communication unit.
The central processing unit may include an overvoltage, an undervoltage, an overcurrent, and a disconnection of the motor based on a voltage sensing signal and a current sensing signal of the voltage sensing unit and the current sensing unit, an output signal of the voltage sensor, and a pressure sensing signal of a pressure sensor when the motor is driven. And checking the disconnection, short circuit, and signal abnormality of the pressure sensor and controlling the motor driving unit to stop driving of the motor when an abnormality occurs. The method of claim 1,
The communication unit is a CAN transceiver for performing CAN communication with the main control unit of the vehicle,
The central processing unit compares the actual measured pressure by the target pressure and the pressure sensor to check whether the fuel pressure control failure,
The CAN transceiver checks whether the CAN timed out according to whether or not a control signal is received.
And checking whether the CAN bus is off according to whether a message transmission confirmation signal is received from the CAN transceiver a predetermined number of times. The method of claim 2, wherein the communication unit
And a communication module for performing communication with the main control unit of the vehicle in a PWM manner. 4. The method according to any one of claims 1 to 3,
The motor driver may include a gate driving circuit configured to generate a switching signal according to a control signal of the CPU.
A motor switching circuit for driving a motor by switching driving power based on the switching signal,
A voltage divider is provided between the output terminal of the gate driving circuit and the ground potential line.
The motor driving control device further includes a comparator for comparing the voltage level of the control signal input to the gate driving circuit with the voltage level of the switching signal output from the gate driving circuit. 5. The method of claim 4,
A first input terminal of the comparison unit is connected to an input terminal of the gate driving circuit,
The second input terminal of the comparison unit is connected to a node provided between the output terminal of the gate driving circuit and the voltage dividing means,
And the central processing unit performs a controller self-diagnostic function according to whether the voltage level of the control signal and the voltage level of the switching signal are the same in the comparing unit. (a) supplying driving power from a power supply to a motor drive control device for driving a fuel pump motor when the engine is started by an ignition key;
(b) receiving a target pressure from the main control unit of the vehicle,
(c) driving the motor by changing the duty value of the control signal based on the target pressure received in step (b) and the detected pressure detected by the pressure sensor;
(d) checking whether a failure occurs while driving the motor; and
(e) stopping the driving of the motor and notifying the main controller of the failure, if it is determined that the failure occurs as a result of the inspection of step (d);
Step (d) is a step of detecting the voltage and current of the driving power applied to the motor from the power supply (d1),
(d2) detecting the fuel pressure pumped by the fuel pump;
(d3) overvoltage, undervoltage, overcurrent of the driving power source, disconnection and short circuit of the motor, disconnection of the pressure sensor, short circuit, pressure sensor signal error, fuel The control method of the motor drive control device, characterized in that for checking the pressure control failure. The method of claim 6, wherein step (d3)
If the voltage level of the pressure detection signal sensed in the step (d2) is greater than the first predetermined value, it is determined to be a high pressure state signal or more, and if the voltage level of the pressure detection signal is less than the second predetermined value less than the first predetermined value, the low pressure state signal. The control method of a motor drive control apparatus characterized by the above-mentioned determination. The method of claim 6, wherein step (d)
The control method of the motor drive control apparatus, characterized in that it is determined that the failure occurs only when the signal corresponding to the failure state is maintained for a predetermined holding time. The method of claim 6, wherein step (d)
(d4) performing a controller self-diagnosis by comparing voltage levels of signals inputted and outputted to a gate driving circuit of a motor driving unit generating a switching signal for driving the motor;
(d5) if the input and output signals are different in the step (d4), the control method of the motor drive control device comprising the step of determining that the abnormality of the controller. The method of claim 6, wherein step (d)
And if the value obtained by subtracting the actual measured pressure in the step (d2) from the target pressure is greater than a preset limit range, determining the fuel pressure control failure. The method of claim 10, wherein step (d)
The control method of the motor drive control apparatus, characterized in that it is determined as a steady state even if the value obtained by subtracting the target pressure from the actual measured pressure of the step (d2) is larger than the preset limit range. The method of claim 6, wherein step (d)
(d6) detecting the voltage of the power applied to the pressure sensor, and when the detected voltage level is smaller than a preset reference voltage value, determining that the pressure sensor voltage supply is abnormal. Control method of control device. The method of claim 6, wherein step (d)
(d7) if the control signal non-receipt state of the main controller is maintained for a preset holding time, determining the CAN time-out state;
(d8) if the message transmission confirmation signal of the communication unit communicating with the main control unit is not received more than a predetermined number of times, determining the CAN time-out state.

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