JP2715606B2 - Constant speed traveling equipment for vehicles - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a constant speed traveling apparatus for a vehicle that automatically controls a throttle opening so that a vehicle, particularly an automobile, travels at a constant vehicle speed.

2. Description of the Related Art FIG. 4 shows an embodiment of a constant speed traveling device for a conventional vehicle. For the sake of simplicity, the same elements as those of the embodiment of the present invention are denoted by the same reference numerals. In the figure, the release of constant-speed running is determined by the brake detection signal 10, the clutch detection signal 11,
A command signal for releasing the constant-speed running such as a release command detection signal 12, a power-supply-lowering signal 13, and a shift-position detection signal 14 by a human and a constant-speed running start signal 24 are directly input to the microcomputer 23 constituting the controller 9 and Identify start and release signals in software.

The microcomputer 23 outputs a solenoid control signal 24 to release and start the constant speed traveling from the microcomputer 23, controls the solenoid 39 via the switching element 21, and thereby controls the transmission of the displacement of the actuator to the throttle mechanism.

The solenoid power cutoff device 8 is controlled by the operation of the brake or the shift position.

In the control device for the solenoid of the constant-speed traveling device configured as described above, the power of the solenoid is shut off depending on whether the brake is depressed or the shift position is changed, a stop lamp, a shift position, a human release command, etc. A command signal for releasing the constant speed traveling is detected by the microcomputer, and a signal for releasing the solenoid is output from the microcomputer.

However, in the above device, when the microcomputer runs out of control due to strong electromagnetic noise or the like, the constant-speed traveling device is suddenly activated, and while the surprised driver is stepping on the brake, or while in the shift position, It can be very dangerous that it is only released by the change of.

 An object of the present invention is to solve the above problems.

Means for Solving the Problems As described above, the present invention sets a target vehicle speed according to the vehicle speed detecting means for detecting the actual vehicle speed of the vehicle and the driver's will,
A target vehicle speed setting device for inputting start / release of a constant speed traveling device and inputting acceleration / deceleration of a target vehicle speed, an actuator for changing a throttle opening of an engine of a vehicle, and a solenoid for controlling connection and disconnection of displacement of the actuator to an accelerator wire Driving means such as a device, from the actual vehicle speed and the target vehicle speed of the vehicle, a vehicle constant-speed traveling device including a controller that outputs a drive signal to the actuator,
A power cutoff device for cutting off the power for the driving means by a brake and a shift position, and a brake detection signal, a clutch detection signal for detecting that a clutch is depressed, a release command signal for the target vehicle speed setting device, A means for detecting a drop detection signal of a drive power supply of the actuator, a release command signal based on a shift position, and the like; the brake detection signal, the clutch detection signal, a release command signal of the vehicle speed setting device, an actuator power drop detection signal A control signal such as a release command signal based on the shift position is prohibited from being turned on by the latch circuit through the latch circuit, and a control signal is input to the microcomputer of the controller to recognize a current input state. The driving means is also prohibited from the computer and the target When a command to start the constant speed traveling is received from the speed setting device, the microcomputer releases the latch circuit and permits the driving means to be turned on only when all of the control signals are in a state in which the constant speed traveling is possible. Is output.

Further, when the microcomputer is in a reset state, the turning-on of the driving means is prohibited by the watchdog timer for detecting runaway prevention of the microcomputer, thereby canceling the constant-speed running by shutting off the power supply for the driving means and the microcomputer. Of the constant speed traveling by the software described above, the constant speed traveling by the latch circuit and the watchdog timer, and the four systems of the constant speed traveling.

According to the present invention as described above, the turning off of the driving means, which is the key to the safety of the constant speed traveling device, is prohibited from being turned on from the four systems of the power supply, the latch circuit, the microcomputer algorithm, and the watchdog timer. By doing
In the event of microcomputer runaway, peripheral circuit failure, power supply system failure, etc., the throttle opening control drive means will not be fixed while it is on, and the fail-safe of constant speed traveling equipment will be greatly improved Can be fulfilled.

FIG. 1 is a block diagram of a constant-speed traveling device according to an embodiment of the present invention. 1 is a vehicle speed detecting means, 2 is a target vehicle speed setting device, 3 is an actuator, 4 is a solenoid device, 5
Is a throttle mechanism, 6 is an engine, 7 is a vehicle body, 8 is a solenoid power cutoff device, and 9 is a controller.

FIG. 2 is a circuit diagram relating to control of a solenoid 39 for transmitting and blocking the displacement of the actuator in FIG. 1 to the throttle mechanism 5. 10 is a brake detection signal, 11 is a clutch detection signal, 12 is a release command detection signal, 13 is a drop detection signal of the power supply for driving the actuator, 14 is a shift position detection device 15 to 19 by the detection signals of the above 10 to 14, respectively. This is a latch circuit for holding and outputting a signal for inhibiting the solenoid from being turned on. Reference numeral 20 denotes a logic circuit that outputs an ON command to the switching element 21 only when all the inputs do not inhibit the ON of the solenoid. 22 is a watchdog timer for detecting runaway of the microcomputer, 23 is a microcomputer, 24 is a solenoid on permission signal from the microcomputer, and 25 is a constant speed running start signal.

FIG. 3 is an algorithm of a microcomputer relating to on / off control of the solenoid.

The operation will be described below with reference to FIGS. First,
A description will be given of the start of constant-speed running. When the microcomputer 23 receives the constant-speed running start signal 25, the microcomputer 23, according to FIG. 3, executes a process for releasing the constant-speed running of 10 to 14 in FIG. The reset signal of the latch circuit is output, all the signals output from the latch circuits 15 to 19 to the logic circuit 20 are turned into a signal for permitting the solenoid to be turned on, and the solenoid control signal 24 is also supplied from the microcomputer 23 to the solenoid 39. And the logic circuit 20 outputs the ON signal of the solenoid 39, and the constant speed traveling is started via the switching element 21.

Next, a description will be given of an operation of canceling the constant speed traveling from the time of the constant speed traveling. According to FIG. 3, when at least one of the signals for releasing the constant speed running of 10 to 14 in FIG. 2 is inputted, at least one of the latch circuits 15 to 19 in FIG. A signal is output to the circuit 20 to inhibit the solenoid 39 from being turned on. At the same time, according to the algorithm shown in FIG. 3, a signal for prohibiting the solenoid 39 from being turned on is also output from the microcomputer 23, a solenoid control signal is output by the logic circuit 20, and the constant speed running is released.

Further, the supply of current to the solenoid 39 is interrupted by the solenoid power supply cutoff device 8 by the brake signal 37 or the shift position signal.

In this manner, a signal for canceling the constant speed running while the vehicle is in the constant speed running state, for example, when the brake is depressed, the brake detection signal 10 detects that the brake is depressed, and the signal is latched by the latch circuit. The latch circuit 19 holds the solenoid, and the latch circuit 19 inhibits the solenoid from being turned on.

At the same time, in the microcomputer 23, as shown in FIG.
Is output.

That is, the solenoid 39 is turned off from the two systems from the latch circuit and the microcomputer to release the constant speed traveling.

When the watchdog timer 22 detects runaway of the microcomputer, the watchdog timer 22 detects runaway of the microcomputer, outputs a reset signal of the microcomputer, and outputs a solenoid prohibition signal to the logic circuit 20. Is output, and constant-speed running is prohibited.

The throttle mechanism 5 controls the throttle opening 32, varies the torque 33 of the engine 6, and changes the vehicle speed.

Note that the clutch detection signal is mounted only on the MT vehicle, but is excluded from the automatic vehicle.

Advantageous Effects of the Invention As described above, according to the present invention, a failure such as a runaway, a failure in a peripheral circuit, or a failure in a power supply system is prevented from being fixed while the throttle control driving unit remains on. The fail-safe constant-speed traveling system can be greatly enhanced.

[Brief description of the drawings]

FIG. 1 is a block diagram of a constant-speed traveling device according to one embodiment of the present invention, FIG. 2 is a circuit diagram relating to control of a solenoid in FIG. 1, and FIG. 3 is a micro circuit relating to on / off control of a solenoid. Diagram showing algorithm of computer, fourth
FIG. 2 is a circuit diagram related to control of a conventional solenoid. 4 ... Solenoid device, 8 ... Solenoid power cutoff device, 9 ... Controller, 20 ... Logic circuit, 21 ... Switching element, 23 ... Microcomputer.

Continuation of front page (56) References JP-A-1-160735 (JP, A) JP-A-1-153345 (JP, A) JP-A-62-279141 (JP, A) JP-A-1-95945 (JP) , A) Japanese Utility Model 1-69036 (JP, U) Japanese Utility Model 1-73036 (JP, U)

Claims (3)

(57) [Claims] 1. An actual vehicle speed detecting means for a vehicle, a target vehicle speed setting device for setting a target vehicle speed, starting / releasing a constant speed traveling device, and inputting acceleration / deceleration of a target vehicle speed, and an actuator for changing a throttle opening of an engine. A means for controlling a brake or a shift position to transmit / cut off the displacement of the actuator to a throttle mechanism, a controller for outputting a drive signal to the actuator from the actual vehicle speed and the target vehicle speed, and a control signal. Means for detecting a brake signal for detecting that a certain brake has been depressed, a release command signal for the target vehicle speed setting device, a drop detection signal for a power supply for driving the actuator, and a release command signal for a shift position, respectively. The controller controls the control signal through a latch circuit and a logic circuit. While controlling the transmission / interruption means, the control signal is input to a microcomputer which is a component of the controller, and the transmission / interception means is also controlled from the microcomputer, and a constant speed is transmitted from the target vehicle speed setting device. When a command to start running is received, the microcomputer releases the latch circuit and permits transmission of the transmission / interruption means only when all of the control signals are in a state in which traveling at a constant speed is possible. A constant speed traveling device for a vehicle, characterized in that: 2. A controller provided with a watchdog timer, wherein when the microcomputer is in a reset state by the watchdog timer, transmission of the displacement of the actuator to the throttle mechanism is interrupted by the transmission / shut-off means. The constant-speed traveling device for a vehicle according to claim 1, wherein: 3. In a vehicle having a manual transmission, a clutch detection signal for detecting that a clutch is depressed is added as a control signal input to the microcomputer. Or the constant-speed traveling device for a vehicle according to 2.