KR100226086B1 - Driving power control circuit of a vehicle - Google Patents

Abstract

The present invention relates to a driving force control circuit of a vehicle capable of ensuring double the safety of the driving force control device by quickly and accurately operating a solenoid valve and a direct current servo motor using two microcomputers. Electronic control circuit which operates solenoid valve by inputting speed, engine rotation speed through engine speed sensor interface circuit, and throttle valve rotation angle through throttle valve rotation angle sensor interface circuit, and operates throttle valve by DC servo motor. The first microcomputer and the second microcomputer are connected to each other through a data exchange line and communicate at regular intervals, and include a double channel relay integrated circuit, a microcomputer monitoring circuit, a solenoid drive and a leakage current monitoring circuit, a DC servo motor safety circuit, and a DC servo. With motor driving circuit The lure is.

Description

Driving force control circuit of the vehicle

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle, and more particularly, to a driving force control circuit of a vehicle capable of ensuring double the safety of a driving force control device by operating a solenoid valve and a direct current servomotor using two microcomputers.

In general, in the driving force control device, the brake torque is controlled by a solenoid valve and the engine output is controlled by an electronic throttle operated directly by a DC servo motor.

Since the engine power is greatly affected by the minute opening and closing of the throttle valve, the electronic controller must control the throttle valve quickly and accurately.

In addition, since the vehicle is accelerated and decelerated according to the operation and non-operation of the solenoid valve and the opening and closing of the throttle valve, the stability of the solenoid valve and the throttle valve electronic control is directly related to the driving of the vehicle and the driver's safety.

If the power supply of the electronic controller is unstable or malfunctions such as short circuits of the solenoid coil and the DC motor coil, or the overcurrent condition of the motor is detected, the electronic controller of the driving force control device shuts off the power supply of the solenoid valve and the DC motor drive unit. By preventing the malfunction of the solenoid valve and the throttle valve, it is possible to ensure the safety of the vehicle and the driver.

In addition, when the power supply of the solenoid valve driving unit is cut off, the brake torque is directly added or subtracted by the driver pressing down the brake pedal.

When the power supply of the DC motor drive unit is cut off, the throttle valve is directly operated by the accelerator pedal so that the acceleration / deceleration driving of the vehicle is directly controlled by the driver rather than by the electronic controller.

The present invention has been made to solve such a conventional problem, the driving force of the vehicle to ensure the safety of the drive force control device by double acting to operate the solenoid valve and the DC servomotor quickly and accurately by using two microcomputers The purpose is to provide a control circuit.

In order to achieve the above object, the present invention provides the wheel speed through the wheel speed sensor interface circuit, the engine speed through the engine speed sensor interface circuit, and the throttle valve rotation angle through the throttle valve rotation angle sensor interface circuit. In the electronic control circuit that operates the solenoid valve and drives the throttle valve with a DC servo motor, the first microcomputer and the second microcomputer are connected to each other through a data exchange line to communicate at regular intervals. Circuit, solenoid driving and leakage current monitoring circuit, DC servo motor safety circuit and DC servo motor driving circuit is provided.

1 is a driving force control circuit diagram according to the present invention.

2 is a circuit diagram of a direct current servo motor of the present invention.

3 is a solenoid driving circuit diagram of the present invention.

* Explanation of symbols for main parts of the drawings

1: first microphone 2: second microphone

3: relay integrated circuit 4: solenoid driving circuit

5: microcomputer monitoring circuit 6: wheel speed sensor interface circuit

7: Engine speed sensor interface circuit

8: Throttle valve rotation angle sensor interface circuit

9: DC servo motor safety circuit 10: DC servo motor driving circuit

M: DC servo motor L1-Ln: Solenoid coil

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is an electronic control circuit diagram of the present invention, which receives a wheel speed signal, an engine speed signal, and a throttle valve rotation angle signal, performs calculation of an engine and brake drive force control algorithm, and operates solenoid valves L1-Ln. The first microcomputer (1) and the first microcomputer (1) for controlling the data exchange with each other, and outputs the motor drive signal to the DC servo motor to drive the DC servo motor, and the rotation angle of the throttle valve A second microcomputer 2 for controlling and a relay integrated circuit for supplying power to the solenoid driving circuit and the DC servo motor driving circuit (

3) and supplies a current to the solenoid coil (L1-Ln) connected to the output terminal of the relay integrated circuit (3) to drive the solenoid valve, and to monitor the leakage current that can flow to the solenoid coil (L1-Ln) Pulses generated from the first and second microcomputers 1 and 2 connected between the solenoid driving circuit 4 and the input terminals of the first and second microcomputers 1 and 2 and the relay integrated circuit 3. The microcomputer supervisory circuit 5 which receives a signal and outputs a signal of a corresponding level (high or low) to the relay integrated circuit 3 and a sine wave signal generated by the wheel speed sensor are input to convert the signal into a square wave signal. The wheel speed sensor interface circuit 6 input to the microcomputer 1 and the square wave signal generated by the engine speed signal processor receive the square wave signal suitable for the input signal level of the first microcomputer 1 to convert the square wave signal to the first signal. Engine rotation speed to input to microcomputer 1 A throttle valve rotation angle sensor interface circuit 8 for shaping a degree sensor interface circuit 7, a rotation angle sensor signal of the throttle valve, and outputting it to the first and second microcomputers 1 and 2; DC servo motor safety circuit 9 connected to the microcomputer 2 to supply / block 5V power, and the power supply is supplied from the relay integrated circuit 3 and the DC motor M is controlled by the control of the second microcomputer 2.

It is composed of a DC servo motor driving circuit 10 of the full bridge section (FULL BRIDGE SECTION) that controls (), and reference numeral R1 in the figure is a resistor.

The first microcomputer 1 and the second microcomputer 2 operate with different calculation loop times, and the calculation loop time of the second microcomputer 2 is smaller than the calculation loop time of the first microcomputer 1. It is set.

2 is a detailed diagram of the DC servomotor safety circuit 9, which includes a voltage regulating circuit 11 for constantly adjusting an input voltage and a resistor for distributing an output voltage of the voltage regulating circuit 11.

The voltage divider 12 includes R2 and R3 and transistors Q1 and Q2 that are switched on and off according to the output level of the voltage divider 12.

FIG. 3 is a detailed circuit diagram of the solenoid driving circuit 4. The circuit for operating the six solenoid valves, for example, receives the signal VD1 and the signal EN1 of the first microcomputer 1 and logically multiplies them. The first and gate A1, the second and second gates A2 for receiving and ANDing the signals VD2 and the signal EN1 of the first microcomputer 1 and the signal of the first microcomputer 1 VD3) and signal (E

A third end gate A3 for receiving and multiplying N1 and a signal VD of the first microcomputer 1

4) the fourth end gate A4 for receiving and AND multiplying the signal EN1, and the fifth end gate receiving and ANDing the signal VD5 and the signal EN1 of the first microcomputer 1; (A5), the sixth end gate A6 for receiving and logically multiplying the signal VD6 and the signal EN1 of the first microcomputer 1, and the output of the first end gate A1 are connected to the gate. The first MOSFET MT1 connected to the solenoid coil L1 is connected to the source, and the output of the second AND gate A2 is connected to the gate, and the second MOSFET MT2 connected to the solenoid coil L2 is connected to the source. ), The third MOSFET MT3 having the output of the third and gate A3 connected to the gate, and the solenoid coil L3 connected to the source, and the output of the fourth AND gate A4 connected to the gate. The fourth MOSFET MT4, to which the solenoid coil L4 is connected, and the output of the fifth and gate A5, are connected to the gate, and the solenoid code is connected to the source. (L5) comprises a fifth MOS fat (MT5) and a sixth AND gate (A6) of the sixth MOS fat (MT6) output is connected to the gate and source, the solenoid coil (L6) is connected in the connection.

According to the present invention configured as described above, when the input terminal IN1 is high while the battery voltage is connected to the power input terminal VCC of the relay integrated circuit 3, the output terminal OUT1 is turned on to the power input terminal Vcc. The input battery voltage is output to the output terminal OUT1 as it is. On the contrary, when the input terminal IN1 is low, the output terminal OUT1 is turned off.

Similarly, when the input terminal IN2 is high, the output terminal OUT2 is turned on, and the battery voltage V _BATT inputted to the VCC terminal is output as it is to the output terminal OUT2, and the input terminal IN2 is

Output terminal OUT2 is turned off.

When the solenoid coil connected to the output terminal OUT1 is short-circuited and overcurrent flows, and the relay integrated circuit 3 is brought to a high temperature state, the output terminal OUT1 is turned off and power is not supplied to the solenoid coil.

In addition, when the DC integrated circuit coil connected to the output terminal OUT2 is short-circuited and the overcurrent flows, the relay integrated circuit 3 is brought to a high temperature, the output terminal OUT2 is turned off to supply power to the DC servo motor M. It doesn't work.

The first microcomputer 1 calculates the engine and brake driving force control algorithm based on the wheel speed, the engine speed, and the throttle valve rotation angle as the calculated loop time time 1, and the second microcomputer 2 calculates the calculated loop time time. Calculate the DC servomotor control algorithm with 2.

In this case, the calculation loop time time 2 of the second microcomputer 2 is smaller than the calculation loop time time 1 of the first microcomputer 1, so that the DC servo motor M may be precisely controlled.

When the control of the brake torque is required, the first microcomputer 1 outputs the operation signals of the solenoid valves L1 to Ln to the solenoid driving circuit 4 through the output terminals VD1 to VDn, respectively.

The first microcomputer 1 calculates the target throttle valve opening required for engine driving force control according to the engine power control algorithm, and transmits the target throttle valve opening to the second microcomputer 2 through the data exchange line every three time periods.

Meanwhile, the first and second microcomputers 1 and 2 receive the throttle valve rotation angle signal TPS as an input through the input terminal AD3, and calculate and process the calculated throttle valve rotation angle every three time periods. Exchange each other via data exchange line.

In the first microcomputer 1, the throttle valve rotation angle TPS1, which has been directly calculated, has a second microcomputer 2

Is compared with the calculated throttle valve rotation angle (TPS2) calculated on the other hand, while in the second microcomputer (2) the calculated direct throttle valve rotation angle (TPS2) is calculated in the first microcomputer (1) Compare or not match the treated throttle valve rotation angle TPS1.

If the first microcomputer 1 matches the calculated throttle valve rotation angle TPS1 and TPS2, the microcomputer supervisory circuit 5 generates a supervisory signal WD1 which is followed by a pulse signal of short amplitude every time 3 elapses. Output to

When the calculated throttle valve rotation angle TPS2 and TPS1 coincide with each other, the second microcomputer 2 outputs a supervisory signal WD2 which leads to a short pulse signal every time 3 passes.

)

The microcomputer supervisory circuit 5 has a circuit for sensing the cycles of the supervisory signals WD1 and WD2. When both the supervisory signals WD1 and WD2 have a time 3, the output terminal SAC is safe. The high signal, which is a signal, is output to the input terminals IN1 and IN2 of the relay integrated circuit 3 to inform the relay integrated circuit 3 that the first and second microcomputers 1 and 2 are normally operated.

However, when any one of the monitoring signals WD1 and WD2 is not the time 3, the low signal, which is a dangerous signal, is output to the output terminal SAC, and the input terminal IN1 of the relay integrated circuit 3 is used.

Output to (IN2) to inform the relay integrated circuit 3 that the first microcomputer 1 or the second microcomputer 2 is abnormally operated so that the solenoid valves L1-Ln and the DC motor M are deactivated. do.

In addition, the DC servo motor driving circuit 10 configures a full bridge section with four MOSFETs to drive the DC motor M in a single pole driving manner.

Here, the second microcomputer 2 performs the calculation of the DC servo motor control algorithm based on the target throttle valve opening degree transmitted from the first microcomputer 1 to output the DC motor as the PWM terminal.

Outputs the variable square wave amplitude, which is the amount of rotation of M), and outputs the clock or counterclockwise rotation of the DC motor M to the terminal DIR.

The DC servo motor driving circuit 10 is a built-in current measuring circuit that measures the motor input current I _TOP entering the DC motor M and the motor output current I _BOTTOM coming out of the DC motor M.

The current measurement circuit converts the measured motor input current I _TOP into a voltage signal to generate a second microcomputer.

Measured motor output current (I _B ) by outputting to input terminal (ADI) of analog-digital modulation part of (2)

_OTTOM ) is converted into a voltage signal and the input terminal of the analog digital modulator of the second microcomputer 2 (

Output to AD2).

The second microcomputer 2 calculates the motor input current I _TOP and the motor output current I _BOTTOM by multiplying the voltage signal input to the analog-digital modulator by the current measurement circuit constant.

By using the motor input current I _TOP and the motor output current I _BOTTOM calculated as described above, the second microcomputer 2 determines whether an electrical defect such as a short circuit of the motor coil is generated in the DC motor M. do.

If the DC motor M is operating in a state where there is no electrical defect, the second microcomputer 2 outputs a low signal to the DC servomotor safety circuit 9 through the terminal EN2 to output the DC motor M.

) Can be operated.

When the second microcomputer 2 determines that the DC motor M has an electrical defect, the second motor 2 outputs a high signal to the DC servomotor safety circuit 9 through the terminal EN2 so that the DC motor M does not operate. do.

Fig. 2 shows a detailed view of such a DC motor servomotor safety circuit 9, in which a voltage distribution section 12 composed of resistors R2 and R3 after the 12V voltage is adjusted to 5V by the voltage regulating circuit 11. The voltage is distributed through the transistor and applied to the transistors Q1 and Q2. When the low level is output from the terminal EN2 of the second microcomputer 2 and the transistor Q2 is turned off, the transistor Q1 is turned on. The SV power is applied to the DC servomotor driving circuit 10 through the transistor Q2.

On the contrary, when the high level signal is output from the terminal EN2 of the second microcomputer 2, the transistor Q2 is turned on and the transistor Q1 is turned off, so that the 5V power supply is supplied to the DC servomotor driving circuit 10. Not authorized

On the other hand, when an electrical fault occurs in the DC motor (M), the relay integrated circuit 3 immediately cuts off the power generated through the output terminal (OUT2) to prevent the DC motor (M) from operating.

In addition, the solenoid driving circuit 4 includes a function for detecting a leakage current that may occur in the solenoid coil, so that when the leakage current does not flow in the solenoid coils L1 to Ln, the input terminal of the first microcomputer 1 IMON) is input to the high level, but when a leakage current flows in any one of the solenoid coils L1-Ln, a low signal is inputted through the input terminal IMON of the first microcomputer 1 and the first microcomputer 1 It will be recognized that leakage current flows through.

Fig. 3 shows a detailed view of the solenoid drive circuit 4, which is a circuit for driving six solenoid valves, for example. In the normal state, the output terminal EN1 of the first microcomputer 1 (

Since the high level signal is output through the VD1-VD6 and the high level signal is output through the output terminal of the first to sixth gates A1-A6, the first to sixth MTMT-MT6 are turned on. do.

However, when a low level signal is output through the output terminal EN1 of the first microcomputer 1, a low level signal is output from the first to sixth gates A1 to A6 to generate the first to sixth MOSFETs. Since (MT1-MT6) is off, the solenoid coil (L1-L6) is not excited and the solenoid valve does not operate.

If an electrical fault occurs in the solenoid coils L1-L6, the low voltage signal is output from the relay integrated circuit 3 to the output terminal OUT1 to immediately shut off the supply power, thereby causing the solenoid coils L1-L6 to shut off. It will not work.

As described above, the driving force control circuit of the vehicle of the present invention uses the two microcomputers to perform the driving force control algorithm in the first microcomputer 1 and the DC servo motor algorithm in the second microcomputer 2 to perform the direct current. There is an effect that the rotation angle of the servomotor can be precisely controlled.

In addition, the microcomputer monitoring circuit 5 and the DC servomotor safety circuit 9 are used to detect the malfunction of the microcomputer, such as a malfunction of the microcomputer, a short circuit of the solenoid coil and the DC servomotor coil, and to detect the solenoid coil and the DC servomotor. Operation can be shut off immediately to prevent malfunction of solenoid valves and electronically controlled throttle valves.

In addition, the solenoid valve is supplied with power through the output terminal OUT1 of the relay integrated circuit 3 and the DC servo motor M is supplied with power through the other output terminal OUT2 of the relay integrated circuit 3. If the solenoid coil has an electrical fault, it is impossible to control the brake torque, but the engine output can be controlled. If the solenoid coil has an electrical fault, the engine output control is impossible but the brake torque control is possible. have.

In addition, even when the monitoring function of the relay integrated circuit 3 shows a defect, the first microcomputer is still present.

(1) can perform the monitoring function independently, on the other hand, when the monitoring function of the first microcomputer 1 is defective, there is an effect that the relay integrated circuit 3 can perform the monitoring function independently. .

In addition, even when the monitoring function of the relay integrated circuit 3 shows a defect, the second microcomputer 2 may still perform the monitoring function independently, whereas the monitoring function of the second microcom 2 may be defective. In this case, there is an effect that the relay integrated circuit 3 can independently perform a monitoring function.

In addition, when an electrical defect occurs in the DC motor M, the relay integrated circuit 3 and the second microcomputer 2 simultaneously perform a monitoring function, thereby increasing the safety of the engine output control.

Claims (8)

A first microcomputer (1) which receives the wheel speed myth, the engine speed signal, and the throttle valve rotation angle signal, calculates an engine and brake driving force control algorithm, and controls the operation of the solenoid valves L1-Ln; A second microcomputer 2 for connecting a first microcomputer 1 to exchange data with each other, outputting a motor driving signal to a DC servo motor to drive a DC servo motor, and controlling a rotation angle of the throttle valve, and a solenoid driving circuit The solenoid valve is driven by supplying current to the relay integrated circuit 3 for supplying power to the furnace and DC servo motor driving circuits, and the solenoid coils L1 to Ln connected to the output terminal of the relay integrated circuit 3. Is connected between the solenoid driving circuit 4 for monitoring the leakage current that can flow to the solenoid coils L1-Ln, and the input terminals of the first and second microcomputers 1 and 2 and the relay integrated circuit 3. 1st, 2nd My (1) (2) receives the pulse signal generated from the microcomputer monitoring circuit (5) for outputting the signal of the corresponding level to the relay integrated circuit (3), and the sine wave signal generated by the wheel speed sensor receives a square wave The wheel speed sensor interface circuit 6 converts the signal into a first microcomputer 1 and receives a square wave signal generated by the engine speed signal processing unit, and applies the square wave signal suitable for the input signal level of the first microcomputer 1. The engine rotation speed sensor interface circuit 7 for converting the signal into the first microcomputer 1 and the rotation angle sensor signal of the throttle valve, and outputting the output to the first and second microcomputers 1 and 2. A valve rotation angle sensor interface circuit 8, a DC servomotor safety circuit 9 connected to the second microcomputer 2 to supply / block power, and a relay integrated circuit 3 to receive power. 2 microcomputers (2) DC servo motor drive circuit having a full bridge section for controlling the DC motor (M) by control ( 10) the driving force control circuit of the vehicle, characterized in that it comprises a. 2. The DC servo motor safety circuit 9 according to claim 1, wherein the DC servo motor safety circuit 9 includes a voltage adjusting circuit 11 for constantly adjusting an input voltage, and a voltage divider for distributing an output voltage of the voltage adjusting circuit 11 ( 12) and a transistor (Q1) (Q2) which is switched on / off in accordance with the output level of the voltage divider (12). 2. The solenoid driving circuit 4 according to claim 1, wherein the signal VD1 of the first microcomputer 1 is applied. The solenoid coil is operated according to the output of the first to n-th gate A1-An and the first to n-th gate A1-An that receive and logically multiply the VDn and the signal EN1. And a first to n-th MOSFET MT1-MTn for controlling the operation of L1-Ln to detect a leakage current of the solenoid coil and output a monitoring signal to the first microcomputer 1. A driving force control circuit of the vehicle. The method according to claim 1, wherein the first microcomputer (1) operates a solenoid valve to control brake torque, independently calculates the throttle valve rotation angle, and communicates the obtained target throttle valve opening degree through a data exchange line. The driving force control circuit of the vehicle, characterized in that for transmitting to the second microcomputer (2) every cycle. The method of claim 1, wherein the second microcomputer 2 receives the throttle valve rotational angle independently and calculates the target throttle valve opening transmitted from the first microcomputer 1 every communication period through the data exchange line. A driving force control circuit for a vehicle, characterized in that to perform a DC motor control algorithm as a reference. 6. The method according to claim 4 or 5, wherein the first microcomputer 1 and the second microcomputer 2 operate at different calculation loop times, and the calculation loop time of the second microcomputer 2 is determined by the first microcomputer 1. The driving force control circuit of the vehicle, characterized in that less than the calculated loop time. The method of claim 1, wherein the microcomputer monitoring circuit 5 compares the period of the monitoring signal output from the first and second microcomputers 1 and 2 with the communication period, and any one of the monitoring signals differs from the communication period. In case the driving force control circuit of the vehicle characterized in that the control to output the danger signal so as not to operate the solenoid valve and the DC motor. 2. The relay integrated circuit (3) according to claim 1, wherein the relay integrated circuit (3) cuts off the power supplied to the solenoid valve through the output terminal (OUT1) when the solenoid coil is short-circuited due to a built-in monitoring function. The driving force control circuit of the vehicle, characterized in that for interrupting the power supplied to the DC servo motor (M) through the output terminal (OUT2).

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