KR19990073863A - Electronically controlled actuator - Google Patents

Abstract

The present invention relates to an electronically controlled actuator, comprising: a signal generator consisting of an accelerator pedal, a water temperature sensor, an RPM sensor, and a speed sensor; A switch unit comprising a brake switch, an air conditioner switch, a door switch, a neutral switch, a throttle switch, an actuator return switch, a clutch switch, and a constant speed switch; An optical separation unit for modulating a signal generated by the switch unit into a light beam; A reset signal generator for generating a reset signal; A microcomputer which receives a signal and executes a process indicated by a program to generate a control signal and initializes the system by a reset signal; A motor driver for generating a drive current according to a control signal of the microcomputer; An actuator motor for advancing and forwarding the actuator to adjust the output of the vehicle engine; A secondary microcomputer that operates when the microcomputer is down and acts as a microcomputer; A position dog timer for detecting a malfunction of the microcomputer; An ypyrom which records driving conditions according to input conditions of the signal generator and the switch unit; A display unit which displays whether the system is operating normally; Alarm sound generating unit for generating an alarm sound to prevent the malfunction of the actuator control circuit.

Description

Electronically controlled actuator

The present invention relates to an electronically controlled actuator, and more particularly, to an electronically controlled actuator for preventing a malfunction of a control circuit for controlling an actuator, which is connected to an actuator motor and controls an output of the engine speed of the vehicle. It is about.

In recent years, large buses have a distance of 7m or more from the driver's seat and the engine, and the driver's accelerator footrest is made of cable or compressed air, so that the transmission characteristics are poor and the life is short. An electronically controlled actuator is applied to a vehicle.

Fig. 1 shows a structure including a stepping motor 1, that is, an electronic motor and a driving circuit 2 of the motor. The drive circuit 2 is composed of power transistors which conduct and cut off the current to the stator winding of the stepping motor 1. The timing control circuit 3 provides a timing control signal to the drive circuit 2 for controlling the operation timing of the stepping motor 1. The controller 4 is formed of a microprocessor (CPU) or the like, and provides a control signal to the timing control circuit 3. The drive current provided to the stepping motor 1 flows through the output line 5. The drive signal line 6 and the control signal line 7 are also provided.

The controller 4 instructs the direction of rotation in the forward or reverse direction to control the driving circuit 3 following a specific procedure, and the single phase or two phase or the signal / ideal excitation mode. And it provides a control signal of a specific mode indicating the number of movement steps.

The timing control circuit 3 determines the phase to be excited and the driving time and the excess driving time according to the previously programmed driving procedure in response to the instruction, and continues to drive the signal until the movement of the indicated number of steps is completed. (6) is supplied to the drive circuit (2).

Rated current feedback is provided to control the on and off of the drive signal 6 to keep the current supplied to the stepping motor 1 constant.

The driving circuit 2 turns on and off the power transistors provided in the driving circuit in order to turn on and off the driving current for each phase of the stepping motor 1 in response to the driving signal 6. When the overdrive circuit is used, the current reference value is set to a large dimension to generate a larger torque.

The stepping motor 1 generates torque by the interaction of the vector sum of the magnetic field generated by the driving current for each phase and the rotor magnetic field, thereby rotating and stopping.

Therefore, the stepping motor 1 is rotated by the number of steps indicated by the control signal provided from the controller 4 to push and pull the actuator to adjust the output of the engine.

However, the conventional actuator control circuit as described above may cause malfunction due to noise or noise, which may cause a large accident.

Accordingly, the present invention has been made to solve such a problem, and an object of the present invention is to reset the microcomputer by restarting the microcomputer every time the driver applies the brake and to prevent the microcomputer from malfunctioning. Even if it is down, the secondary microcomputer that was being monitored is operated to act as a microcomputer to prevent a malfunction.

The present invention for achieving the above object is a signal generator consisting of an accelerator pedal, water temperature sensor, RF sensor and speed sensor; A switch unit comprising a brake switch, an air conditioner switch, a door switch, a neutral switch, a throttle switch, an actuator return switch, a clutch switch, and a constant speed switch; An optical separation unit for modulating a signal generated by the switch unit into a light beam; A reset signal generator for generating a reset signal; A microcomputer which receives a signal and executes a process indicated by a program to generate a control signal and initializes the system by a reset signal; A motor driver for generating a drive current according to a control signal of the microcomputer; An actuator motor for advancing and forwarding the actuator to adjust the output of the vehicle engine; A secondary microcomputer that operates when the microcomputer is down and acts as a microcomputer; A position dog timer for detecting a malfunction of the microcomputer; An ypyrom which records driving conditions according to input conditions of the signal generator and the switch unit; A display unit which displays whether the system is operating normally; Characterized in that it is provided; alarm sound generating unit for generating an alarm sound.

1 is a schematic diagram showing a control circuit of a conventional actuator.

2 is a block diagram showing a schematic structure of an electronically controlled actuator according to the present invention.

3 is a diagram illustrating an embodiment of a reset signal generator.

4 is a timing chart of each part of the reset signal generator of FIG.

<Explanation of symbols for the main parts of the drawings>

10: signal generator 20: switch unit

30: optical separation unit 40: reset signal generating unit

41, 42, 43: Inverter 44: NAND gate

50: microcomputer 60: motor drive unit

70: auxiliary micro 80: actuator motor

90: timer 100: Y pyrom

110: display unit 120: alarm sound generating unit

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

2 is a block diagram illustrating an electronic control actuator for preventing a malfunction according to the present invention.

2 shows a signal generator 10 for generating a signal for a measured value, a switch unit 20 for generating a signal according to the pressure when it is energized, the switch unit 20, and a microcomputer 50. In order to electrically insulate), the optical separation unit 30 for modulating the signal generated by the switch unit 20 into a light beam, and a reset signal generator for generating a reset signal according to the pressure applied to the brake switch to operate the switch. 40 and a control signal generated by executing a process represented by a program to the input data signal, and driven according to the control signal of the microcomputer 50 and the microcomputer 50 for initializing the system by the reset signal. Operation when the motor drive unit 60 which generates a signal, the actuator motor 70 which adjusts the output of the vehicle engine by moving the actuator forward and backward, and the microcomputer 50 are down. The operating signal of the sub-microcomputer 80, which acts as the micro-computer 50, and the microcomputer 50 and the sub-microcomputer 80 is monitored, and an error signal is generated when the processing indicated by the program is not completed within a predetermined time. A position dog timer 90 for outputting the yipirom 100 for recording the driving conditions according to the input conditions of the signal generator 10 and the switch unit 20, and a display unit for displaying the normal operation of the system ( 110 and an alarm sound generating unit 120 generating and outputting a voice alarm for overheating the engine according to the signal of the water temperature sensor measuring the temperature of the vehicle engine.

The signal generator 10 includes an accelerator pedal for generating a signal for advancing and reversing the actuator by a change in resistance value, a water temperature sensor for measuring a temperature of the engine and generating a signal for generating a warning sound when an overheat condition occurs; An ALPM sensor for detecting a rotational speed of the engine and generating a signal corresponding to the detected rotational speed, and a speed sensor for detecting a speed of the vehicle and generating a signal corresponding to the detected speed.

The switch unit 20 includes a brake switch, an air conditioner switch, a door switch, a neutral switch, a throttle switch, an actuator return switch, a connection driving switch, a clutch switch, and the like.

The power supplied to the actuator motor 70 is fed back to a constant current circuit (not shown) when the motor is driven, so that the rotational force of the motor is increased and a constant current source having a constant level is supplied to the power supply. Even when the actuator motor 70 is in a stopped state, a constant current flows to generate a lot of heat. Therefore, when a high level signal is detected from the actuator return switch to protect the actuator motor 70, the phase output current of the motor driving unit 60 is detected. To block.

The display unit 110 may include a door indicator, an RPM indicator, an air conditioner indicator, an engine indicator, a brake indicator, a clutch indicator, a neutral indicator, a constant speed indicator, a throttle indicator, an actuator return indicator, a speed indicator, and an accelerator pedal indicator.

FIG. 3 shows an embodiment of the reset signal generator 40. Inverters 41, 42, 43 for inverting an input signal, a logic circuit NAND gate 44, a resistor R, It consists of a capacitor (C) and a diode (D) which controls the flow of current.

4 shows the voltage level of each part in the reset signal generator 40 of FIG. 3 as a timing chart, where ⓐ is a waveform of a signal input to the circuit (ie, a waveform generated by operating a brake switch). Ⓑ is a waveform diagram in which ⓐ is a phase inversion through the inverters 41 and 42, and ⓒ is a delay time at the rising edge by the resistor R and the capacitor C. FIG. Is a waveform diagram, and ⓓ is a waveform diagram showing that the phase is inverted through the inverter 43, and ⓔ is a waveform diagram showing the waveform diagram ⓐ and the waveform diagram ⓓ appear logically combined by the NAND gate 44. .

An operation of the reset signal generator 40 configured as described above will be described in detail with reference to FIG. 4.

When a signal having a rising edge and a falling edge, such as ⓐ, is input to the reset signal generator 40, a signal such as ⓑ in which the phase is inverted through the inverters 41 and 42 is output, and ⓑ outputted from the inverter 42. Has a delay time at the rising edge as the time constant (RC) while passing through the resistor (R) and the capacitor (C), ⓒ with the delay time is inverted by the inverter 43 and output as a signal such as ⓓ Therefore, the signals output from the inverter 41 and the inverter 43 are logically combined by the NAND gate 44 to output a signal such as ⓔ. As a result, the reset signal (low level) is output for the time delayed by the time constant RC at the falling edge of the input signal.

Hereinafter, the operation of the present invention having the above configuration will be described in detail.

When the vehicle is started, the microcomputer 50 retracts the actuator motor 70 until the signal of the actuator return switch is detected to set the position of the actuator regardless of the input state. Starts the operation according to the input condition after checking with the start condition, and when the signal for the change of the resistance value of the accelerator pedal is applied, it makes the change of the resistance value the position change value of the actuator according to the internal program. (The actuator position is the minimum length. When the actuator return signal is detected, the resistance value is maximum, the actuator position is the maximum length, and when the engine output is maximum, the resistance value is minimum.)

On the other hand, regardless of the resistance of the accelerator pedal, when the actuator is automatically controlled by the microcomputer 50, the actuator operates according to the condition of the switch unit 20. During constant speed driving, the constant speed switch is energized and the accelerator pedal value is It is set at the maximum, and the actuator is controlled by the acceleration / deceleration operation at the reference speed point, and the constant speed release is completely released when the constant speed switch is turned off, and the constant speed value is reset when the brake switch, the neutral switch, and the clutch switch operate. Is set.

The water temperature sensor measures the engine temperature and controls the normal ALPM even when the throttle switch is on at low temperature, generates an alarm sound when the engine is overheated, and maintains the actuator at idle even if the accelerator pedal value changes to protect the engine. do. When the door switch is off (when the door of the vehicle is open) and the neutral switch is off, the actuator keeps the idling state by the microcomputer 50 even if the accelerator pedal value is changed to prevent the vehicle opening and closing.

However, when the brake switch of the switch unit 20 is turned on (every time the brake is operated) during the above operation, the reset signal generator 40 shown in FIG. 3 receives the reset signal through the above-described process. The microcomputer 50 is initialized to prevent malfunction.

As described above, according to the present invention, in order to prevent malfunction of the microcomputer, a reset signal is instantaneously applied every time the brake is operated, so that even if the microcomputer malfunctions, the microcomputer may return to normal operation.

Claims (5)

It detects and detects the accelerator pedal which generates a signal for moving the actuator forward and backward by the change of the resistance value, the water temperature sensor which measures the temperature of the engine and generates a signal for generating a warning sound when an overheating condition occurs. A signal generator (10) comprising an RPM sensor for generating a signal corresponding to the rotated speed, and a speed sensor for generating a signal corresponding to the detected speed by detecting the speed of the vehicle; A switch unit 20 including a brake switch, an air conditioner switch, a door switch, a neutral switch, a throttle switch, an actuator return switch, a clutch switch, and a constant speed switch; An optical separation unit 30 for modulating a signal generated by the switch unit 20 into an optical beam to electrically insulate the switch unit 20 from the microcomputer 50; A reset signal generator 40 connected to the optical splitter 30 to apply a pressure to the brake switch of the switch 20 to generate a reset signal when the switch is operated; A microcomputer (50) which executes a process indicated by a program on the input data signal to generate a control signal, and initializes the system by the reset signal of the reset signal generator (40); A motor driver 60 generating a drive signal according to the control signal of the microcomputer 50; An actuator motor 70 for advancing and forwarding the actuator to adjust the output of the vehicle engine; An auxiliary microcomputer (80) which operates when the microcomputer (50) is down and acts as a microcomputer (50); A position dog timer (90) for monitoring the operation steps of the microcomputer (50) and the auxiliary microcomputer (80) and outputting an error signal if the processing indicated by the program is not completed within a predetermined time; An ypyrom (100) connected to the auxiliary microcomputer (80) to record driving conditions according to input conditions of the signal generator (10) and the switch unit (20); A display unit (110) connected to the auxiliary microcomputer (80) to indicate whether the system is normally operated; And an alarm sound generating unit (120) for generating and outputting a voice alarm for overheating of the engine according to a signal of a water temperature sensor for measuring the temperature of the vehicle engine. The reset signal generator 40 includes an inverter 41, 42, 43, a NAND gate 44, a resistor R, a capacitor C, and a diode D to operate a brake. An electronic control actuator, characterized in that to generate a reset signal every time to initialize the microcomputer (50) and the auxiliary microcomputer (80) to prevent malfunction. The method of claim 1, wherein the motor driving unit 60 by controlling the back electromotive force according to the rotation of the actuator motor 70 to maintain an accurate constant current by the electronic control, characterized in that to increase the rotational force while reducing the consumption of energy Actuator. The method of claim 1, wherein the output of the motor drive unit 60 is cut off when the signal of the actuator return switch of the switch unit 20 is detected at a high level in order to protect the actuator motor 70 from heat. Electronically controlled actuator. The input signal of the reset signal generator 40 and the input signal of the microcomputer 50 are controlled by the optical separator 30 using the photodiode PD and the phototransistor PTR. An electronically controlled actuator, which is electrically isolated and protected from noise.