KR20100111793A - Unit for driving brush dc motor diesel vehicle and method thereof - Google Patents

Abstract

PURPOSE: A device and a method of driving a DC motor of a brush type for a diesel vehicle are provided to prevent the accident due to a motor or a driving device since the states of the motor and the driving device are informed to a user through the self-diagnosis. CONSTITUTION: A device of driving a DC motor of a brush type for a diesel vehicle comprises a power supply circuit(101), a voltage detecting circuit(102), a current detecting circuit(106) and a control unit(103). The power supply circuit supplies the voltage to a motor(1). The voltage detecting circuit detects the power, which is supplied from the power supply circuit to the motor. The current detecting circuit detects the driving current of the motor. The control unit receives the voltage of a specified range from an ECU(Electronic Control Unit). The control unit controls the driving of the motor depending on the voltage and current, which are detected from the voltage detecting circuit and the current detecting circuit.

Description

Brushless DC motor driving device and driving method for diesel fuel vehicles {UNIT FOR DRIVING BRUSH DC MOTOR DIESEL VEHICLE AND METHOD THEREOF}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driving device and a driving method for driving a brushed DC motor of a diesel fuel vehicle. Particularly, a specific driving is performed by receiving a voltage from an ECU (Electronic Control Unit) and controlling a CPU inside the driving device to rotate the motor. The present invention relates to a brush-type DC motor driving device and a driving method for supplying fuel by stepless control rather than RPM and diagnosing an abnormality of a motor and a driving device.

In general, a fuel pump is a device that supplies fuel from a fuel tank to a carburetor or an injection nozzle. In a carburetor engine, a mechanical diaphram pump is mainly used. An electric motor pump is used.

Here, the electric fuel pump uses an electric motor fuel pump, which can supply enough fuel required by the fuel engine, maintains residual pressure in the circuit, and can supply fuel at the moment of ignition switch operation. Accordingly, there is a strong advantage to the vapor lock (Vaper Lock).

When fuel is supplied to the fuel engine, the ignition switch is operated by the start switch when the engine is in a start state. Accordingly, after the fuel engine is operated, the fuel pump is operated by an interface box which is a control unit. Is on / off controlled.

When the ignition data or the rotational speed data are not input to the interface box described above, the fuel pump motor is stopped. When the ignition data or the rotational speed data is input, the fuel pump motor is driven by the motor controller to drive the fuel supply to the engine. Start control for.

1 is a block diagram schematically showing a fuel pump motor control apparatus according to the prior art.

As shown in FIG. 1, the conventional driving device of the fuel pump motor is a voltage-variable motor control method, and a motor that rotates a fuel pump by using a 3-phase full bridge method using an FET (1). The motor driver 11 driving the motor 11 detects the rotor position (angle) of the motor 1 and the current supplied to the motor 1 through the motor driver 11, and the FET of the motor driver 11. The motor controller 16 which transmits a switching signal required for switching of the vehicle, receives the driving speed (for example, 1 to 5 speed) data from the ECU 3 of the vehicle through the interface 15 and is input according to the driving speed. MCU (14) and DC output from the MCU (14) for receiving a PWM (Pulse Width Modulation) signal from the motor controller 16 to adjust the rotational speed data of the motor (1) to convert the analog DC voltage PW converts voltage to PWM signal and outputs M controller 13, a DC-DC converter 18 converts the voltage supplied from the power supply unit 5 of the vehicle into a constant voltage of 12V and outputs a 12V voltage from the DC-DC converter 18. Switching driving power supply unit 17 for supplying driving power for switching the FET element of the motor driving unit 11, by switching the power supplied from the power supply unit 5 using the PWM signal output from the PWM controller 13 It is composed of a power converter 12 for adjusting the amount of power output.

The driving device 10 of the conventional fuel pump motor configured as described above is a response speed because it converts and supplies power supplied to the motor driving unit 11 that drives the motor 1 to a switching mode power supply (SMPS) method. Is relatively slow and difficult to control precisely, and because the SMPS circuit constituting the power converter 12 requires a relatively large and heavy transformer, there is a problem in that the driving apparatus is enlarged.

In addition, the motor controller 16 detects the rotor position of the motor 1 and serves as a simple switching to create a path through which current can flow in three phases so that the rotor can rotate. It is difficult to control precisely because it is slightly distorted every time it is delivered in stages, which results in slow response speed and deviation.

In addition, since the fuel pump motor according to the related art rotates simply in proportion to the PWM signal according to the speed control, the driving state of the fuel pump motor cannot be reflected, and thus, when the fuel pump motor is overloaded, Such a phenomenon may occur such as a decrease in speed and an increase in current consumption. If a decrease in the speed of the fuel pump motor occurs, feedback control is not performed accordingly, so that the fuel required by the speed control may be constantly supplied to the fuel engine. There was no such problem.

In addition, the conventional PWM control method outputs a PWM signal proportional to the vehicle speed signal, so that the DC motor simply rotates at the appropriate speed. Therefore, when the DC motor is loaded, the speed decreases and the current consumption increases. Since the RPM is not measured separately, the rotational speed of the DC motor cannot be known, and thus a constant speed cannot be maintained.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a drive device for driving a brushed DC motor of a diesel fuel vehicle in which a sufficient amount of hydraulic oil can be supplied to an engine clutch and a transmission even when a failure occurs in a CAN communication line. And a driving method.

Another object of the present invention can be driven by receiving a PWM signal through the connection line when the CAN communication timing error and communication line is disconnected, and can continue to drive the BLDC motor by sensing the temperature in the oil pump driving device when the connection line is also disconnected To provide a driving device and a driving method for driving a brushed DC motor of a diesel fuel vehicle.

In order to achieve the above object, a brushed DC motor driving device for driving a brushed DC motor of a diesel fuel vehicle according to the present invention includes a power supply circuit for supplying voltage to a motor, and detecting power supplied from the power supply circuit to the motor. A voltage detection circuit, a current detection circuit that detects a drive current of the motor, receives a voltage within a predetermined range from an ECU (Electronic Control Unit), and drives the motor according to the voltage and current detected by the voltage detection circuit and the current detection circuit. It characterized in that it comprises a control means for controlling the.

In the brush type DC motor drive device according to the present invention, the voltage input from the ECU to the control means is characterized in that the DC 8 ~ 14V.

In the brush-type DC motor driving apparatus according to the present invention, the control means is characterized in that the motor controls the motor in accordance with the DC voltage from the ECU.

In addition, in the brush-type DC motor driving apparatus according to the present invention, the control means includes an A / D converter and a memory unit, wherein the predetermined internal DC voltage / motor driving current map is stored in the memory unit. It is done.

In addition, in the brush type DC motor driving apparatus according to the present invention, the control means is characterized in that the variable control of the motor in accordance with the map for each internal DC voltage / motor driving current.

In addition, the brush-type DC motor driving apparatus according to the present invention, characterized in that it further comprises a motor driving means for driving the motor in accordance with the PWM output signal from the control means.

In addition, in the brush-type DC motor driving apparatus according to the present invention, the motor driving means includes a three-phase full bridge circuit composed of FET elements and a FET driving circuit for driving the FET elements of the three-phase full bridge circuit. It is done.

In the brush type DC motor driving apparatus according to the present invention, the control means outputs a first frequency signal to the ECU when the motor is abnormal, and sends a second frequency signal to the ECU when the driving apparatus is abnormal. It is characterized by outputting.

In the brush type DC motor driving apparatus according to the present invention, the control means outputs a 5 Hz frequency to the ECU when the driving apparatus and the motor are normal, and the first frequency signal is an 8 Hz frequency, and the second The frequency signal of is characterized in that the frequency of 15Hz.

In addition, in the brush-type DC motor drive device according to the invention, the motor is characterized in that the motor for the fuel supply pump of the diesel fuel vehicle.

In order to achieve the above object, the brush-type DC motor driving method according to the present invention includes the steps of: (a) supplying a voltage to the motor, (b) detecting power supplied to the motor, (c) driving the motor Detecting a current, and (d) controlling the driving of the motor by the CPU according to the voltage and current detected in the steps (b) and (c).

As described above, according to the driving device and the driving method for driving the brush-type DC motor of the diesel fuel vehicle according to the present invention, the effect that the motor can be controlled by the output from the ECU to improve the fuel economy can be obtained. Lose.

In addition, according to the driving device and the driving method for driving the brush-type DC motor of the diesel fuel vehicle according to the present invention, because the user is notified of the abnormality of the motor and the driving device through the self-diagnosis, the accident by the motor or the driving device is not delayed. The effect of being prevented is also obtained.

These and other objects and novel features of the present invention will become more apparent from the description of the present specification and the accompanying drawings.

EMBODIMENT OF THE INVENTION Hereinafter, the structure of this invention is demonstrated according to drawing.

In addition, in description of this invention, the same code | symbol is attached | subjected to the same part and the repeated description is abbreviate | omitted.

2 is a block diagram schematically illustrating a brush type DC motor driving device of a diesel fuel vehicle according to the present invention.

As shown in FIG. 2, the brush-type DC motor driving device 100 of the diesel fuel vehicle according to the present invention outputs the power supplied from the vehicle power source 5 to the respective components of the motor 1 and the driving device. The power supply circuit 101, the voltage detection circuit 102 for detecting the power supplied from the power supply circuit 101 to the motor 1, the CPU 103 as a control means, and the PWM from the control means 103. Drive means for driving the motor 1 according to an output signal and a current detection circuit 106 for detecting a drive current of the motor.

The driving means includes a three-phase full bridge circuit 105 composed of FET elements and a FET driving circuit 104 for driving the FET elements of the three-phase full bridge circuit 105.

The power supply circuit 101 includes an EMC filter for reducing electromagnetic noise (EMC) and a constant voltage regulator. The power supply circuit 101 receives a battery (BATT) supply power supply 5 from the vehicle and passes through the constant voltage regulator to the motor 1. Output to each component of the drive.

The CPU 103 includes an A / D converter and a memory unit, and receives a DC voltage (for example, 8 to 14 V DC) in a range from an ECU (Electronic Control Unit: 30) and is detected by the voltage detection circuit and the current detection circuit. The motor is controlled according to the voltage and current.

That is, when the ECU 30 of the diesel vehicle sends 8-14V DC, the CPU 103 receives the PID by using an internal DC voltage / motor driving current map (MAP) inputted through the A / D converter and stored in the memory unit. A PWM duty (DUTY:%) is calculated and transferred to the FET driving circuit 104 according to a (Proportional Integral Derivative) control algorithm. The power of the motor 1 is always a constant voltage is transmitted through the power supply circuit 101, and changes the RPM of the motor in accordance with the FET drive signal. Therefore, the ECU 30 controls the driving device 100 through the DC voltage to supply fuel.

At this time, the internal control period of the CPU 103 is not a method having a regular time interval, but a time-variant method, which is inversely proportional to the speed of the motor 1.

In other words, when the speed of the motor 1 is slow, the control period is long, and when the speed of the motor 1 is fast, the control period is short, which means that the speed of the motor 1 is optimized at the optimum time in accordance with the speed of the motor 1. By controlling the speed to be adjustable, it is possible to improve responsiveness and precision unlike conventional control methods.

In addition, the CPU 103 performs feedback control through PID (Proportional Integral Derivative) control so that the current rotation speed of the motor 1 can reach the target rotation speed.

Here, PID control is a kind of feedback control that allows the output of the system to maintain the reference voltage based on the error between the control variable and the reference input, and P control (proportional) is proportional to the error signal between the reference signal and the current signal. The control signal is multiplied by a constant gain to make a control signal. I control (proportional integral) uses integral control in parallel to proportional control to integrate the error signal to create a control signal, and D control (proportional derivative) controls the derivative of the error signal. It is a control method that uses the derivative control to make a signal in parallel to the proportional control.

Therefore, the CPU 103 uses the PWM duty calculated to increase or decrease through the PID control, and performs feedback control so that the motor 1 reaches the target rotational speed, thereby enabling more accurate control. The PID control equation and graph will be described below.

The CPU 103 also outputs a PWM signal to the FET drive circuit 104 to control the motor 1 via the three-phase full bridge circuit 105.

The three-phase full bridge circuit 105 is a switching circuit provided such that the PWM signal is output or interrupted. The three-phase full bridge circuit 105 includes a FET device for driving the motor 1.

In addition, an N-channel MOSFET is used for both the high side and the low side of the three-phase full bridge circuit 105, because the FET driving circuit 104 turns the FET device. Since the device is integrated with a gate driver that turns on / off, the P / N channel MOSFET is not applied due to the application of the device, and only the N channel MOSFET is used.

Here, the FET driving circuit 104 is configured to include a charge pump together with the gate driver to drive an N-channel MOSFET to improve reliability.

Therefore, the PWM signal output from the CPU 103 is transmitted to the motor 1 by the switching signal of the three-phase full bridge circuit 105, the motor 1 is three-phase (U, V, W) It rotates to reach the target speed through the line.

3 is a diagram illustrating PID control of a brush type DC motor driving apparatus 100 of a diesel fuel vehicle according to the present invention, which will be described with reference to FIG. 2. As shown in FIG. 3, when the current detection circuit 106 detects a drive current of the motor, the CPU 103 compares with the target rotational speed (reference value) of the motor 1.

Therefore, the difference between the target rotational speed (reference value) and the actual rotational speed (actual value), that is, the error as the input value E (n) of the PID control, is proportional gain K _P , integral gain K _I , and derivative. The gains K _D are respectively calculated to calculate an output value Y (n) for error correction.

The equation for the PID control is shown in Equation 1 below.

Here, the CPU 103 determines that the three-phase line of the motor 1 is open or shorted, for example, when the error between the target RPM and the actual RPM of the motor 1 is 30% or more.

4 is a graph illustrating a sampling time according to a motor speed in the PID control of FIG. 3. The PID control of FIG. 4 is driven by a time-variant system.

In other words, the sampling time Ts is changed in accordance with the speed of the motor 1 to improve the response characteristics and the RPM error.

Therefore, assuming the same sampling rate, Kp is similar to changing according to the RPM of the motor 1, and when the first drive is driven, the motor 1 is driven with a preset PMW duty (%), and the CPU 103 Calculates an error E (n) by comparing the target rotational speed of the motor 1 with the current RPM.

At this time, the error E (n) is divided by Kp (P gain), and the E (n) / Kp value is added in the section where the motor 1 is accelerating, and in the section where the motor 1 is decelerating. Subtract the P gain, for example, set it to 250 by default.

Therefore, the PWM signal of the motor 1 may be defined by Equation 2 as follows.

Motor Drive PMW Signal = Current PWM Duty (%) ± (Error (E (n)) ÷ P Gain (Kp))

Here, when the motor 1 is accelerated, when the PWM duty (%) is more than the maximum value (Max Limit), the PWM duty (%) is fixed to the maximum limit value, the PWM duty (%) is less than the minimum value (Min Limit) In this case, the PWM duty (%) is fixed at the lowest limit so as not to go out of range.

However, if the speed of the current motor 1 reaches within 10% of the target rotational speed of the motor 1 to decelerate slowly when the motor 1 decelerates, the P gain Kp may be changed to another value (eg, 800). Divide by).

That is, the P gain is divided by changing the P gain when the motor 1 is decelerated or when the current speed of the motor 1 is within 10% of the target speed of the motor 1 so that the speed of the motor 1 is nonlinear. Do not change the enemy.

Next, the method of diagnosing the abnormality of the drive of the brush-type DC motor and the drive apparatus of a diesel fuel vehicle is demonstrated according to FIG.

5 is a flowchart illustrating a method for diagnosing a brushed DC motor of a diesel fuel vehicle according to the present invention.

First, power is supplied from the vehicle power supply 5 to the power supply circuit 101 of the driving device 100 (S10).

Next, the voltage and current applied to the motor 1 are detected using the voltage detection circuit 102 and the current detection circuit 106 (S20 and S30).

The CPU 103 also outputs a PWM signal to the FET driving circuit 104 in accordance with the DC voltage from the vehicle ECU 30. That is, the CPU 103 uses the DC voltage / motor driving current maps preset in the memory unit using the voltage and current detected by the voltage detection circuit 102 and the current detection circuit 106 to drive the motor. Output the PWM signal (S40).

At this time, if the current is out of the map and the current exceeds the 'Max Limit' value for a predetermined time in a state where the voltage is constant in the map for each DC voltage / motor driving current (S50), it is determined that the motor 1 is abnormal and the preset first The self-diagnosis signal is outputted to the ECU 30 as a frequency signal at S60. Accordingly, the ECU 30 notifies the user of the abnormality of the motor 1 through normal alarm means (S70).

In addition, in step S50, if the 'Max Limit' value does not exceed a predetermined time, it is determined whether the current is out of the map exceeds the 'Min Limit' value for a predetermined time (S80).

If the 'Min Limit' value exceeds a predetermined time in step S80, it is determined that the driving device 100 is abnormal and outputs a self-diagnosis signal to the ECU 30 at a second frequency (S90). Accordingly, the ECU 30 ) Notifies the user of the abnormality of the driving apparatus 100 through the normal alarm means (S100).

That is, for example, when the operating current of the driving device for a diesel vehicle is 0 ~ 20A, as described above as a safety (SAFETY) function in the present invention, before the current is out of the map to reach the 'Max Limit' value ' When a predetermined time (for example, 100 msec) exceeds a predetermined overcurrent limit value (for example, 15A) that is lower than the Max Limit 'value, the CPU 103 determines that the overcurrent is detected and the FET driver circuit 104 It reduces the duty of output PWM signal.

At this time, when the current becomes lower than the overcurrent limit value (for example, 15A) and enters the normal map, the CPU 103 returns to control by the normal map.

As shown in FIG. 6, the CPU 103 outputs, for example, a square wave frequency signal of 5 Hz to convey to the ECU 30 that the motor 1 and the driving device 100 are normal.

In addition, when the CPU 103 exceeds the 'Max Limit' value (for example, 18A) for a predetermined time (for example, 1000 msec), the CPU 103 determines that the motor 1 is abnormal, as shown in FIG. 7. When a square wave frequency signal of 8 Hz, for example, is generated as the frequency of 1 and outputted to the ECU 30, the ECU 30 notifies the user of the abnormality of the motor 1.

In addition, when the 'Min Limit' value (for example, 1A) exceeds a predetermined time (for example, 2000 msec), the CPU 103 determines that the drive device 100 is abnormal, as shown in FIG. 8. If, for example, a square wave frequency signal of 15 Hz is generated as the second frequency and output to the ECU 30, the ECU 30 notifies the user of the abnormality of the driving apparatus 100.

On the other hand, when both the motor 1 and the driving device 100 are broken, the ECU 30 outputs a square wave of frequencies of 8 Hz and 15 Hz alternately so that the ECU 30 and the driving device 100 are both broken. It can be set as the structure which notifies.

The above-mentioned over-current limit value is a value that allows the drive device to operate below a certain current to ensure durability within a range where there is no abnormality, and the 'Max Limit' value is to detect an abnormal occurrence by short circuit or disconnection of the motor or motor part. 'Min Limit' is a value to detect the occurrence of a part of a circuit or IC in the driver.

On the other hand, in the case of time, the overcurrent limit value should be determined within a relatively fast time (for example, 100 msec) to protect the driving device, and the 'Max Limit' is sufficient time to determine whether there is an abnormality in the motor unit (for example, For example, it has a 1000msec, 'Min Limit' is a current for almost no flow is determined for a relatively long time (for example, 2000msec) to determine the abnormality of the drive device.

As mentioned above, although the invention made by this inventor was demonstrated concretely according to the said Example, this invention is not limited to the said Example and can be variously changed in the range which does not deviate from the summary.

1 is a block diagram schematically showing a fuel pump motor control apparatus according to the prior art;

Figure 2 is a block diagram schematically showing a brush type DC motor drive device of a diesel fuel vehicle according to the present invention,

3 is a diagram illustrating PID control of a brush type DC motor driving device of a diesel fuel vehicle according to the present invention;

4 is a graph showing a sampling time according to a motor speed in the PID control of FIG.

5 is a flowchart illustrating a method for diagnosing a brushed DC motor of a diesel fuel vehicle according to the present invention;

6 is a signal waveform indicating that the motor and the driving apparatus are normal;

7 is a signal waveform indicating an abnormality of a motor,

8 is a signal waveform showing an abnormality of a driving apparatus.

<Description of Symbols for Main Parts of Drawings>

100: brush type DC motor drive device

10l: power supply circuit 102: voltage detection circuit

103: CPU 104: FET driving circuit

105: three-phase full bridge circuit 106: current detection circuit

Claims (15)

Power circuit for supplying voltage to the motor, A voltage detection circuit detecting power supplied from the power supply circuit to the motor; A current detection circuit for detecting a drive current of the motor; And a control means for receiving a voltage within a predetermined range from an ECU (Electronic Control Unit) and controlling the driving of the motor according to the voltage and current detected by the voltage detection circuit and the current detection circuit. Drive system. The method of claim 1, Brush type DC motor drive device, characterized in that the voltage input from the ECU to the control means is DC 8 ~ 14V. The method of claim 2, And the control means controls the motor in accordance with the DC voltage from the ECU. The method of claim 1, The control means includes an A / D converter and a memory unit, Brush memory DC motor drive, characterized in that the memory is stored in the map for each predetermined internal DC voltage / motor drive current. The method of claim 4, wherein The control means is a brush-type DC motor drive device, characterized in that for variable control of the motor according to the map for each internal DC voltage / motor drive current. The method of claim 1, And a motor driving means for driving the motor according to the PWM output signal from the control means. The method of claim 6, The motor driving means is a three-phase full bridge circuit composed of FET elements and And a FET drive circuit for driving the FET device of the three-phase full bridge circuit. The method of claim 1, The control means outputs a first frequency signal to the ECU when the motor is abnormal; And a second frequency signal is outputted to the ECU when the driving device is abnormal. The method of claim 8, The control means outputs a 5 Hz frequency to the ECU when the driving device and the motor are normal, The first frequency signal is an 8 Hz frequency, The second frequency signal is a brush-type DC motor drive, characterized in that the frequency of 15Hz. The method according to any one of claims 1 to 9, The motor is a brush-type DC motor drive device, characterized in that the motor for the fuel supply pump of the diesel fuel vehicle. (a) supplying a voltage to the motor, (b) detecting power supplied to the motor; (c) detecting a drive current of the motor; (d) controlling the driving of the motor by the CPU according to the voltage and current detected in the steps (b) and (c). The method of claim 11, And the control in step (d) controls the motor steplessly. The method of claim 12, In the step (d), the control is a brush-type DC motor drive method, characterized in that for controlling the motor in accordance with the map according to the internal DC voltage / motor driving current of the CPU. The method according to claim 12 or 13, (e) diagnosing whether the motor is abnormal or the driving apparatus is abnormal. The method of claim 14, If the motor is abnormal in the step (e), the CPU outputs a first frequency signal to the ECU, and if the drive device is abnormal, the CPU outputs a second frequency signal to the ECU. Brushed DC motor drive method.

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