JPS61291225A - Automatic car-speed controller - Google Patents

Abstract

PURPOSE:To improve safety and reliability in anomaly by judging the anomaly of a system from the terminal voltage of a motor for driving a throttle valve and revolving the throttle valve in the direction of deceleration in case of anomaly, when the system is cancelled by the brake operation. CONSTITUTION:A car speed sensor 1 for outputting the operation data proportional to the actual car speed is installed, and said operation data is input into a control means 11. When said control means 11 receives the cruise instruction signal generated by the operation of a command switch 2, the operation data is memorized into a memory means 3. An actuator 6 is controlled through a motor driving circuit 8 in correspondence with the difference between the actual car speed and the memorized car speed, and the opening degree of a throttle valve 5 is adjusted. At this time, the normality is judged by detecting the terminal voltage of the driving motor 7 for the actuator 6 by an anomaly judging means 10, and when anomaly is judged, the driving motor 7 is continuously revolved in the direction of deceleration of the throttle valve 5.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention relates to an automatic vehicle speed control device used to automatically control the traveling speed of a vehicle to a certain set speed. be.

(Prior Art) This type of automatic vehicle speed control device has heretofore been of various configurations, and for example, one has the circuit configuration shown in FIG.

That is, the reference numeral 301 in the figure is a vehicle speed sensor that outputs operation data proportional to the actual vehicle speed, and 302 is a command switch that outputs a cruise command signal. The data is also input to the microcomputer 306 in the controller 303 via interfaces 304 and 305. This microcomputer 306 includes a vehicle speed storage means for storing the vehicle speed at the time of operation in response to the operation of the command switch 302, as well as a vehicle speed stored in the vehicle speed storage means and the actual vehicle speed output by the vehicle speed sensor 301. It has a built-in control means that compares the values and controls the vehicle speed based on the difference.

Further, 307 is a motor-driven 7 actuator that drives a throttle valve 308 of the vehicle, and this actuator 307 is connected to a drive motor 309 and an electromagnetic clutch 3.
10.

Briefly, 311 is a motor drive circuit located in the controller 303 that drives the drive motor 309 of the actuator 307 in forward and reverse directions in accordance with a motor drive signal output from the microcomputer 306.

An actuator switching unit 312 is located in the controller 303 and turns on/off the power supply to the actuator 307 according to the output from the microcomputer 306.
This is done via a relay 313 consisting of a relay coil 313a and a relay switch 313b, which are energized as the actuator switching section 312 is turned on and off.

Further, 314 is a brake switch, 315 is a brake lamp switch, and 316 is a brake lamp.The brake switch 314 and the brake lamp switch 315 are interlocked switches, and when the brake is operated, the brake switch 314 is turned off. A signal for cutting off the power supply to the relay 313, turning on the brake lamp switch 315, and canceling the system is input to the microcomputer 306 via the interface 317 in the controller 303.

Furthermore, 318 is a constant voltage circuit, 319 is a reset circuit,
320 is a main switch for the control device, 321 is a cruise lamp, and 322 is a power source.

In the automatic vehicle speed control device having such a configuration, an actuator 307 that is equipped with a drive motor 307 is used as the actuator 307 that drives the throttle valve 308 of the vehicle.
Since it does not use an actuator that utilizes the engine's suction negative pressure, it is suitable for cases where negative pressure cannot be used, such as in turbocharged engines or small engines.

(Problems to be Solved by the Invention) However, in such a conventional vehicle speed automatic control device, if the brake switch 314 sometimes fails while it is in the ON state, the brake switch 314 will not operate in conjunction with the brake switch 314 when the brake is operated. The brake light switch 315 is
There is a problem in that even if a signal for canceling the system is input to the microcomputer 306, the power to the actuator cannot be immediately cut off.

In addition, if the brake switch 314 fails while in the on state and the relay switch 313b of the relay 313 remains in the on state and welding failure occurs, the power supply to the actuator 307 is cut off when the brake is operated. Therefore, even if the brake lamp switch 315 inputs a signal to the microcomputer 306 to cancel the system, the throttle valve 308 cannot be returned to the neutral position.

Therefore, the present invention has been made by focusing on the above-mentioned conventional problems, and even if the brake switch and relay switch fail, a pseudo motor drive signal is sent to the motor drive circuit at the time of system cancellation. Accordingly, it is an object of the present invention to provide an automatic vehicle speed control device that can determine whether or not the system has canceled and, if the system has not canceled, return the throttle valve to the neutral position.

[Configuration of the Invention] (Means for Solving the Problems) In order to achieve the above object, the configuration of the present invention will be explained using the functional block diagram shown in FIG. 1. A vehicle speed sensor 1 that outputs a cruise command signal, a command switch 2 that outputs a cruise command signal, a vehicle speed storage means 3 that stores operational data of the vehicle speed sensor 1 in response to the operation of the command switch 2, and an electromagnetic clutch 4. A motor-driven actuator 6 that drives the throttle valve 5, a motor drive circuit 8 that rotates the drive motor 7 of the actuator 6 in the normal and reverse directions, a relay 9 that disconnects and supplies power to the actuator 6, and a vehicle speed control Abnormality determination means 10 outputs a pseudo motor drive signal to the motor drive circuit 8 when the control is released, and detects the terminal voltage of the drive motor 7 to determine whether it is normal or not, and the actual vehicle speed and the stored vehicle speed. The motor drive circuit 8
and a control means 11 which sends a command to the engine and rotates the drive motor 7 of the actuator 6 in the direction of decelerating the throttle valve 5 when the abnormality determining means 10 determines that there is an abnormality.

(Function) When the system is canceled due to brake operation, the abnormality determining means 10 sends a pseudo motor drive signal to the motor drive circuit 8 and detects the terminal voltage of the drive motor 7 of the actuator 6, thereby It is determined whether the system is normal or not based on whether or not the terminal voltage appears, and if the terminal voltage of the drive motor 7 appears, it is determined that the system has not been canceled and the control means 11 Upon sending the command, the control means 11 outputs a control signal that causes the drive motor 7 to continuously rotate in the deceleration direction of the throttle valve 5. This forces the throttle valve 5 to return to the neutral position.

(Example) The present invention will be explained below based on the drawings.

FIGS. 2 and 3 are diagrams showing an embodiment of the present invention.

In Fig. 2, 21 is a vehicle speed sensor that outputs pulses that are operation data proportional to the actual vehicle speed, and 22 is a command switch that outputs a cruise command signal.This command switch 22 includes a set switch, a resume switch, etc. included. The outputs from the vehicle speed sensor 21 and the command switch 22 are input to the microcomputer 26 in the controller 23 via interfaces 24 and 25, respectively, in the controller 23. This microcomputer 26 includes a vehicle speed storage means that stores the vehicle speed at the time of operation in response to the operation of the command switch 22, and also outputs a pseudo motor drive signal to the motor drive circuit 27 when automatic vehicle speed control is canceled. The drive motor 2 of the actuator 28 will be described later.
abnormality determination means for detecting the terminal voltage of 9 and determining whether or not the system is normally canceled; The control means controls the vehicle speed and continuously rotates the drive motor 29 of the actuator 28 in the deceleration direction when the abnormality determining means determines that an abnormality has occurred in the system and will not be canceled.

Further, 28 is a motor-driven actuator that drives the throttle valve 30 of the vehicle, and this actuator 28 is equipped with a driving motor 22 and an electromagnetic clutch 31. A clutch portion (not shown) is connected/disconnected in response to a command from a control means, and the rotation of the drive motor 2 is transmitted to the throttle valve 30 via a speed reduction mechanism (not shown). The electromagnetic clutch 31 has an output shaft (not shown) connected to the throttle valve 30 via an output transmission mechanism (not shown), such as an output link.

Further, the motor drive circuit 27 includes a controller 23
The motor 22 for driving the actuator 28 inside the microcomputer 26 is controlled to rotate in the forward or reverse direction according to the motor drive signal output from the control means of the microcomputer 26. a transistor Tr1 that connects one terminal of the motor 22 to the positive electrode of the power source 32; and a motor forward rotation switching section that turns off the transistor Tr1 on-off in response to a motor forward rotation drive signal output from the output port OA of the microcomputer 26. 33, and a transistor Tr for connecting the other terminal of the drive motor 22 to the negative electrode of the power supply 32 in response to the motor positive rotation drive signal output from the output boat OA.
2, a transistor Tr3 that connects the other terminal of the drive motor 22 to the positive terminal of the power supply 32, and turns this transistor Tr3 on and off in response to a motor reverse rotation drive signal output from the output capacitor (OB) of the microcomputer 26. the motor reverse rotation switching section 34, and the output coupler.
A transistor Tr4 is provided to connect one terminal of the drive motor 2 to the negative electrode of the power supply 32 in response to a motor reverse rotation drive signal output from the microcomputer 26 in response to a motor reverse rotation drive signal output from the microcomputer 26. The output motor forward rotation drive signal turns on the transistor Trl and the transistor Tr2, causing the drive motor 2 to rotate forward, that is, to rotate the throttle valve 30 toward the speed increasing side. Also, the output port O of the microcomputer 26
In response to the motor reverse rotation drive signal output from B, transistors Tr3 and Tr4 are turned on, causing the drive motor 22 to rotate in reverse, that is, to rotate the throttle valve 30 toward the deceleration side. Note that both terminals of the drive motor 2 are connected to the check board of the microcomputer 26.
A and IB are connected, and microcomputer 2
An abnormality determining means in 6 checks the voltage appearing between both terminals of the drive motor 22 when automatic vehicle speed control is canceled.

Reference numeral 35 denotes an actuator switching section that is located in the controller 23 and turns on and off the power supply to the actuator 28 according to the output from the control means of the microcomputer 26. The transistor Tr of the actuator switching unit 35 connected to the output port QC is controlled by the control signal output from the output port OC.
This is done via a relay 36 consisting of a relay coil 364 and a relay switch 36b, which are energized when the switch 5 is turned on or off.

Further, 37 is a brake switch, 38 is a brake lamp switch, and 39 is a brake lamp.The brake switch 37 and the brake lamp switch 38 are interlocked switches, and when the brake is operated, the brake switch 3
7 is in the OFF state to cut off the power to the relay 36, and the brake lamp switch 38 is in the OFF state to cancel the system.
The data is input to the control means of the microcomputer 26 through an interface 40 within the computer.

Furthermore, 41 is a constant voltage circuit, 42 is a reset circuit, 43
4 is a main switch for the control device, and 44 is a cruise lamp.

Next, the operation of the automatic vehicle speed control system having such a configuration will be explained with reference to FIG. 3.

First, in order to operate the automatic vehicle speed control device, the main switch 43 is turned off. And vehicle speed sensor 2
1 outputs a pulse signal which is operation data proportional to the actual vehicle speed, inputs this pulse signal to the microcomputer 26 in the controller 23, samples it within a certain period of time, and constantly outputs a pulse signal proportional to the vehicle speed to the microcomputer 26. In this state, for example, after a set signal is input to the control means in the microcomputer 26 by the set switch of the command switch 22, when the input signal is released, the cruise lamp 4 is turned off.
4 lights up, the vehicle speed storage means in the microcomputer 26 stores the number of pulses corresponding to the vehicle speed at that time, and the control means in the microcomputer 26 outputs a relay drive signal from the actuator switching section output port oC. The transistor Tr5 of the actuator switching unit 35 is turned on, and the relay 36 is turned on. At this time, when the relay 36 is turned on, the electromagnetic clutch 31 and the motor drive circuit 27 are energized, and in this state, the control means of the microcomputer 26 controls the motor according to the number of pulses stored in the vehicle speed storage means. The forward rotation drive signal is output, the motor forward rotation switching section 33 of the motor drive circuit 22 and the transistor Tr2 are turned on, and the motor forward rotation switching section 33 is turned on, so that the transistor Trl is turned on. By rotating the drive motor 2 of the actuator 28 in the forward direction, the throttle valve 30 is held at a predetermined position via the electromagnetic clutch 31 and an output transmission mechanism (not shown). After this, even if the accelerator pedal is released, the throttle valve 30 is held at a predetermined position, so that the vehicle can run at a constant speed. In this automatic vehicle speed control, in order to maintain the set vehicle speed, the control means of the microcomputer 26 uses the number of pulses proportional to the actual vehicle speed of the vehicle speed sensor 21 and the pulses stored in the vehicle speed storage means of the microcomputer 26. (memory vehicle speed) and outputs either the motor forward or reverse rotation drive signal corresponding to the difference to the motor drive circuit 27, and operates the drive motor 2 to keep the vehicle speed constant. Then, in order to cancel the automatic vehicle speed control, when the brake is operated, the brake switch 37 is turned off (normally on), cutting off the power to the motor drive circuit 27 and the actuator 28, and the brake switch 37 and The associated brake lamp switch 38 is turned on and sends a signal to the control means within the microcomputer 26 to cancel the system, thereby canceling the system.

At this time, the abnormality determining means in the microcomputer 26 outputs a pseudo motor drive signal to the motor drive circuit 27 and detects the voltage between both terminals of the drive motor 29.

That is, when the main switch 43 is turned on, the third
The abnormality determination routine shown in the figure is also operating, and step 1
In step 01, it is determined whether or not automatic vehicle speed control is in progress. If automatic vehicle speed control is in progress (YES), another program is executed in step 102, and then the process returns to step 101.

Further, if the automatic vehicle speed control is canceled in step 101 (NO), the control means in the microcomputer 26 turns off the drive signal of the switching section 35 for the 7-piece machine in step 103, and switches the relay. Cut off the power to 36.

Then, in either step 104a or step 104b, a pseudo motor drive signal is sent to the motor drive circuit 27. That is, this pseudo motor drive signal may be a motor drive signal for either forward or reverse rotation.For example, in step 104a, the output port OA is turned off and the output boat OB is turned on. This sends a motor forward rotation drive signal to the motor drive circuit 27.

Furthermore, in step 105, the transistors Trl, Try, T in the motor drive circuit 27 are set by a timer.
r3. A switching time (operation delay) is given to Tr4, and this step 105 includes transistors Trl, Tr2 . Tr3. Make sure to turn on Tr4.

By turning off the transistor T during detection
rl, Try, Tr3. This timer is used to prevent false detection due to a delay in the operation of Tr4, and is built in the microcomputer 26.

Then, in step 106, the check boat IA
Determine whether or not a motor drive signal appears on check boat A, and if a motor drive signal appears on check boat A (YES)
In step 107, it is determined that the brake switch 37 and the relay switch 36b have failed because the relay 36 is de-energized, and the brake switch 37 and the relay switch 36b are still in the ON state, and an abnormality timer is added in step 107.

Also, in step 106, check port) IA
If the motor drive signal does not appear at (NO), it is determined in step 108 whether or not a motor drive signal appears at check port (IB). This check po)
If the motor drive signal does not appear on IB (NO),
It is determined that there is no abnormality in the brake switch 37 and relay switch 36b, the abnormality timer is reset in step 109, another program is executed in step 102, and then the process returns to step 101.

Further, in step 108, check port)
If a motor drive signal appears on IB (YES),
It is determined that there is an abnormality in the brake switch 37 and the relay switch 36b, and an abnormality timer is added in step 107.

By double checking in steps 106 and 108 in this manner, failures in the brake switch 37 and the relay switch 36b can be reliably detected.

Then, in step 110, the step 107
It is determined whether the abnormality timer added in has reached a certain time (X). That is, this abnormality determination routine detects a failure of the brake switch 37 and the relay switch 36b, and since the microcomputer 26 may malfunction due to noise (ignition noise, radio wave interference, etc.), in this step 110, a constant If the abnormal state continues for a period of time (X) or more, it is determined that the brake switch 37 and relay switch 36b are malfunctioning. If the abnormality timer does not reach the fixed time (X) or more as a result of this (No), step 1
Return to 01.

Further, in step 110, if the abnormality timer reaches a certain time (X) or more (YES), in step 111, the control means in the microcomputer 26 continuously sends a motor reverse rotation drive signal to the motor drive circuit 27. and output it. That is, since the power to the motor drive circuit 27 and the actuator 28 is not cut off,
To return the throttle valve 30 to the neutral position,
The drive motor 29 is rotated in the direction of deceleration of the throttle valve 30.

Therefore, even if the brake switch 37 and the relay switch 36b fail and the throttle valve 30 is fixed at the same position, the failure of the brake switch 37 and the relay switch 36b is detected and the throttle valve 30 is returned to the neutral position. The system can be canceled with certainty.

[Effects of the Invention] As explained above, according to the present invention, there is a vehicle speed sensor that outputs operation data proportional to the actual vehicle speed, a command switch that outputs a cruise command signal, and a sensor that responds to the operation of the command switch. a vehicle speed storage means for storing operation data of the vehicle speed sensor; a motor-driven actuator for driving the throttle valve via an electromagnetic clutch; and a motor drive circuit for controlling the drive motor of the actuator in forward and reverse rotation. A relay that supplies and cuts off power to the actuator, and an abnormality determination unit that outputs a pseudo motor drive signal to the motor drive circuit when automatic vehicle speed control is canceled and detects the terminal voltage of the drive motor to determine whether it is normal or not. means for sending a command to the motor drive circuit in response to the difference between the actual vehicle speed and the stored vehicle speed, and rotating the drive motor of the actuator in the direction of deceleration of the throttle valve when the abnormality determining means determines that there is an abnormality; By providing a control means, even if the brake switch and relay fail when the brake is operated to cancel the system, the abnormality determination means detects an abnormality in the system, and based on this detection result, the control means forces the throttle valve back to the neutral position,
In addition to being able to reliably cancel the system,
An excellent effect can be obtained in that the safety of the system can be improved.

[Brief explanation of the drawing]

FIG. 1 is a functional flow diagram showing the configuration of an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the circuit configuration of an automatic vehicle speed control device according to an embodiment of the present invention, and FIG. 3 is a microcomputer diagram. A flowchart showing the abnormality determination routine being carried out, and FIG. 4 are explanatory diagrams showing the circuit configuration of a conventional automatic vehicle speed control device. DESCRIPTION OF SYMBOLS 1... Vehicle speed sensor, 2... Command switch, 3... Vehicle speed storage means, 4... Electromagnetic clutch, 5... Throttle valve, 6... Actuator, 7... Drive motor, 8... Motor drive circuit, 9... Relay, 10... Abnormality determination means, 11... Control means. Patent applicant Patent attorney representing Jidosha Electric Industry Co., Ltd.
Yutaka Koshio Figure 3

Claims (1)

[Claims] (1) a vehicle speed sensor that outputs operational data proportional to the actual vehicle speed, a command switch that outputs a cruise command signal, and a vehicle speed storage means that stores operational data of the vehicle speed sensor in response to operation of the command switch; A motor-driven actuator that drives the throttle valve via an electromagnetic clutch, a motor drive circuit that rotates the drive motor of the actuator in forward and reverse directions, a relay that supplies and cuts off power to the actuator, and automatic vehicle speed control cancellation. abnormality determining means for determining whether or not the drive motor is normal by outputting a pseudo motor drive signal to the motor drive circuit and detecting the terminal voltage of the drive motor; An automatic vehicle speed control device comprising: a control means for sending a command to a motor drive circuit and for rotating a driving motor of the actuator in a direction of decelerating a throttle valve when the abnormality determining means determines that there is an abnormality.