JPH0214213B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in a vehicle speed control method for controlling the opening degree of a throttle valve of a vehicle prime mover so that the vehicle speed becomes a preset vehicle speed.

[Conventional technology]

In recent years, vehicle speed control devices that maintain the vehicle speed at a set speed have also become more sophisticated, and there is a speed increasing function that continuously controls the throttle valve opening to the speed increasing side, or a speed increasing function that continuously controls the throttle valve opening to the speed increasing side, or a system that can control the set vehicle speed at any speed regardless of the current vehicle speed. Some devices have been developed that have a preset function that allows the vehicle speed to be set.

[Problem to be solved by the invention] However, in a vehicle that has both of these functions, in addition to the set command for normal vehicle speed control, there is also a speed increase command for the speed increase function and a speed increase command for the preset function. Since there are preset commands, there is a possibility that multiple commands will be issued at the same time due to equipment failure or erroneous operation. If a plurality of commands are generated simultaneously in this way, control may be performed against the driver's wishes.

For example, if the driver accidentally generates a set command and also generates a preset command at the same time, the preset function will not work because the system is configured to give priority to the preset command over the set command. The vehicle may inadvertently drive at a set speed instead of the current speed.

In view of the above, an object of the present invention is to prevent a vehicle from running at a speed contrary to the driver's intention when a set command and a preset command occur simultaneously due to a failure or erroneous operation.

[Means to solve the problem]

Therefore, in the present invention, when it is detected that a set command and a preset command are generated simultaneously, the throttle valve opening control is canceled based on this detection.

Specifically, when a set command is issued by the set switch, the current traveling vehicle speed is set as the set vehicle speed, and when a preset command is issued by the preset switch,
In a vehicle speed control method in which the throttle valve opening of the vehicle prime mover is controlled to maintain the set vehicle speed by setting a vehicle speed arbitrarily set regardless of the current traveling vehicle speed, the set command and the preset command are simultaneously issued. This is characterized in that the occurrence of the throttle valve is detected, and based on this detection, the throttle valve opening control is canceled.

[Effect]

According to the above-mentioned means, even if a set command and a preset command are generated at the same time due to a malfunction or erroneous operation of the device, the vehicle speed control is canceled thereby, so that the vehicle does not run at a speed contrary to the driver's wishes. It never gets put away.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

The drawing mainly shows a block diagram of an electric circuit in a vehicle speed control device embodying the present invention.

10 is a vehicle speed sensor that is turned on and off at a frequency proportional to the vehicle speed; 38 is a set switch that is placed at a position that is easy for the driver to operate and generates a set command;
30 is located close to the set switch 38,
A speed increase switch 80 that generates a speed increase command and also commands the restart of throttle valve opening control that has been once released is a preset switch 80 that is disposed close to the set switch 38 and speed increase switch 30 and that generates a preset command. The switch 82 is placed at a position that is easy for the driver to operate, and the vehicle speed setters 44, 46, and 48, which arbitrarily select and set the preset vehicle speed in the preset function, detect an operation that should cancel vehicle speed control. A stop lamp switch that detects the operation of the brake pedal, a clutch switch that detects the operation of the clutch pedal (or a switch that detects that the shift lever in a torque converter vehicle is operated to the parking position or neutral position) (neutral start switch), parking brake switch that detects parking brake operation,
28 is an actuator for changing and driving the opening degree of a throttle valve of a vehicle prime mover (not shown); 9
0 is a control circuit.

The output of the vehicle speed sensor 10 is output from an analog switch 86.
The voltage is converted into a voltage proportional to the vehicle speed by the F-V conversion circuit 14 via the analog switch 16.
It is input to the memory circuit 18. Therefore, memory circuit 1
8 stores the vehicle speed voltage immediately before the analog switch 16 is switched from on to off. Comparison circuit 20 compares the vehicle speed voltage output from F-V conversion circuit 14 and the vehicle speed voltage output from memory circuit 18,
The lower the former is with respect to the latter, the larger the duty ratio is output, and the higher the former is with respect to the latter, the smaller the duty ratio is output. The output of the comparison circuit 20 is supplied to the drive circuit 26 via an OR gate 42 and an AND gate 24. On the other hand, since the output of the set switch 38 becomes a logic 0 signal when operated, it is inverted by the NOT gate 40 and sent to the analog switch 1 via the OR gate 41.
6 and the set input of the self-holding circuit 66, and is also supplied to the set input of the self-holding circuit 34 via the OR gate 74. The analog switch 16 is turned on when a logic 1 signal is input from the OR gate 41. The self-holding circuits 34 and 66 are set when a logic 1 signal is input to their set inputs, output a logic 1 signal to their outputs, and maintain that state. The output of the speed increase switch 30 is also passed through the not gate 32 to the AND gate 7.
0 and is also supplied to one input of OR gate 74. The output of AND gate 70 is provided to one input of OR gate 41 and one input of OR gate 42, respectively.
Further, the output of preset switch 80 is supplied via not gate 78 to each input of OR gates 41 and 74, analog switch 86, and V-F conversion circuit 84. When the analog switch 86 receives a logic 1 signal from the not gate 78, it cuts off the circuit from the vehicle speed sensor 10 and closes the circuit from the V-F conversion circuit 84. V-F conversion circuit 84
When a logic 1 signal is input from the not gate 78, the voltage set by the vehicle speed setting device 82 is converted into a signal with a frequency proportional to the voltage generated therefrom, and the signal is sent to the F-V conversion circuit via the analog switch 86. 14. The outputs of the stop lamp switch 44, clutch switch 46, and parking brake switch 48 are inputted to the reset input of the self-holding circuit 34 via OR gates 62 and 60 to reset the self-holding circuit 34.
The output of the self-holding circuit 34 is supplied to the drive circuit 36 and the other input of the AND gate 24, and is also supplied to the self-holding circuit 66 via the NOT gate 72.
input to the reset input. Further, the output of the self-holding circuit 66 is input to the other input of the AND gate 70. However, since the outputs of the clutch switch 46 and the parking brake switch 48 are logic 0 signals when they are operated, the logic is inverted when these signals are input to the OR gate 62. The output of stop lamp switch 44 does not need to be inverted since it is a logic 1 signal when operated. Furthermore, the outputs of not gates 40, 32 and 78 are 3
Three AND gates 102 and 104 each receiving two outputs of different combinations among the two outputs.
and 106, each AND gate 102,
The outputs of 104 and 106 are supplied to the reset input of self-holding circuit 34 via OR gates 108 and 60.

The actuator 28 closes the atmosphere release port 28c and opens the negative pressure port 28d when it receives a signal from the drive circuit 26, and has a control valve 28a that normally closes the negative pressure port 28d and opens the atmosphere release port 28c, and a drive circuit 28a. A release valve 28b that closes the atmosphere release port 28f when receiving a signal from the circuit 36 and normally leaves it open; a diaphragm 28g that defines a diaphragm chamber 28e;
g and the throttle valve of the vehicle's prime mover,
When the diaphragm 28g is deformed due to negative pressure in the diaphragm chamber 28e, it moves in the direction of arrow A to increase the opening degree of the throttle valve.
It has a link 28h that increases the output of the prime mover, and a spring 28i that constantly biases the diaphragm 28g in the direction opposite to the arrow A.

Next, the action will be explained.

When the set switch 38 is operated while the vehicle is running at a certain speed, the analog switch 16 is turned on and the F
-The vehicle speed voltage from the V conversion circuit 14 is stored in the memory circuit 18.
is supplied to When the operation of the set switch 38 is completed, the analog switch 16 is turned off, and the memory circuit 18 stores the vehicle speed and voltage setting vehicle speed immediately before the analog switch 16 is turned off. Further, when the set switch 38 is operated,
The self-holding circuit 34 is set and outputs a logic 1 signal, thereby opening the AND gate 24 and supplying a signal to the drive circuit 36 to close the release valve 28b.
is operated so that the atmosphere release port 28f is closed. On the other hand, the comparison circuit 20 compares the vehicle speed voltage from the F-V conversion circuit 14 and the vehicle speed voltage from the storage circuit 18, and sends a pulse signal with a duty ratio corresponding to the difference to the drive circuit via an OR gate 42 and an AND gate 24. 26, and the control valve 28a is operated so that the negative pressure port 28d and the atmosphere release port 28c are alternately opened and closed. Therefore, actuator 2
The diaphragm chamber 28e of 8 becomes a negative pressure corresponding to the memorized set vehicle speed, and the diaphragm 28
g is transformed and link 28h is moved in the direction of arrow A. In other words, if the vehicle speed becomes lower than the set vehicle speed,
The negative pressure in the diaphragm chamber 28e increases, and the ring 2
8h is moved largely in the direction of arrow A to increase the vehicle speed, and when the vehicle speed becomes higher than the set vehicle speed, the negative pressure in the diaphragm chamber 28e weakens, and the link 28h is moved in the direction of arrow A.
Move in the opposite direction to reduce vehicle speed.
By repeating this control, the vehicle speed is controlled to approach the set vehicle speed.

While controlling the vehicle speed in this way, if you depress the brake pedal or clutch pedal or operate the parking brake, switches 44 and 4
Since at least one of AND gates 6 and 48 is turned on, self-holding circuit 34 is reset and its output is switched from logic 1 to 0, and AND gate 2
4 to stop the operation of the control valve 28a and also stop the operation of the release valve 28b.
b is also stopped, atmospheric pressure is rapidly supplied to the diaphragm chamber 28e through the atmosphere release ports 28c and 28f, and the link 28h is quickly returned to its original position. Therefore, vehicle speed control is canceled at this time.

When the speed increase switch 30 is operated after the vehicle speed control is released, a logic 1 signal is output from the NOT gate 32, and this signal resets the self-holding circuit 34 via the OR gate 74, thereby restarting the vehicle speed control.

When the vehicle speed to be controlled is selected and set using the vehicle speed setter 82 and the preset switch 80 is operated, a logic 1 signal is output from the not gate 78, which switches the analog switch 86 and activates the V-F conversion circuit. 84 to set the vehicle speed setting device 8.
A signal having a frequency proportional to the vehicle speed set by 2 is supplied to the F-V conversion circuit 14. At this time, since the analog switch 16 is on, the set vehicle speed converted into a voltage signal by the F-V conversion circuit 14 is stored in the storage circuit 18. Furthermore, since the self-holding circuit 34 is also set via the OR gate 74, when the analog switch 86 is switched to the vehicle speed sensor 10 side after the operation of the preset switch 80 is completed, the vehicle speed starts to reach the speed set by the vehicle speed setting device 82. Vehicle speed control is performed.

When controlling the vehicle speed, the speed increase switch 30
When the self-holding circuit 66 is already set and outputs a logic 1 signal, the signal from the not gate 32 is passed through the AND gate 70, the OR gate 42, and the AND gate 24 to the drive circuit 26.
The control valve 28a is continuously operated to close the atmospheric release port 28c and keep the negative pressure port 28d open. Therefore, the vehicle speed is continuously increased while the speed increase switch 30 is operated. When you finish operating the speed increase switch 30, the analog switch 16 that had been turned on until then is turned on.
is turned off, the set vehicle speed is set to the vehicle speed increased by the operation of the speed increase switch 30, and the vehicle speed is thereafter controlled at that vehicle speed.

Next, suppose that the speed increase switch 30 fails while still generating the operation signal, and if the set switch 38 or the preset switch 80 is operated at that time, the self-holding circuit 66 is set, and the speed increase switch 3
Since the operation signal of 0 passes through the AND gate 70, the signal passes through the OR gate 42 and the AND gate 24.
The vehicle speed is supplied to the drive circuit 26 through the driver, and the vehicle speed is continuously increased irrespective of the set vehicle speed against the driver's will.

However, in this embodiment, the speed increase switch 3
0 and the set switch 38 or preset switch 80 simultaneously generate operation signals, the AND gate 102 or 104 generates a logic 1 signal, so the self-holding circuit 34 is reset via the OR gates 108 and 60 to control the vehicle speed. will be canceled.

Also, when the set switch 38 is operated,
If the preset switch 38 is also operated by mistake, the analog switch 86
is switched to the V-F conversion circuit 84 side, so the memory circuit 18 does not contain the current vehicle speed, but the vehicle speed setter 82.
The vehicle speed that has been carelessly set is stored in the memory, resulting in vehicle speed control being performed at an unexpected vehicle speed.

However, in the present invention, the AND gate 10
6 outputs a logic 1 signal to reset the self-holding circuit 34, so the vehicle speed control is canceled.

In this way, if the preset switch is accidentally operated at the same time while the set switch is being operated, or if a set command and a preset command are generated at the same time due to some kind of failure, vehicle speed control will be canceled. It is possible to prevent the vehicle from running at a speed that is contrary to the driver's wishes.

Note that the present invention is not limited to the embodiments described above, but includes various embodiments such as those listed below.

(1) An electric motor may be used as the actuator 28.

(2) The control circuit 90 may achieve its functions by executing a program on a microcomputer.

〔Effect of the invention〕

As described above, the present invention allows vehicle speed control to be canceled if the preset switch is operated at the same time by mistake while the set switch is being operated, or if a set command and a preset command are generated at the same time due to some kind of failure. Therefore, it is possible to prevent the vehicle from running at a speed contrary to the driver's intention.

[Brief explanation of drawings]

The drawing is a block diagram showing an electric circuit according to an embodiment of the present invention. 10... Vehicle speed sensor, 18... Memory circuit, 20
... Comparison circuit, 28 ... Actuator, 28a
... Control valve, 28b ... Release valve, 30 ... Speed increase switch, 34 ... Self-holding circuit, 66 ... Self-holding circuit, 38 ... Set switch, 80 ... Preset switch, 82 ... Vehicle speed setting device , 90...
control circuit.

Claims (1)

[Claims] 1 When a set command is issued by the set switch, the current running vehicle speed is set as the set vehicle speed, and when a preset command is issued by the preset switch, a vehicle speed arbitrarily set regardless of the current running vehicle speed is set as the set vehicle speed, and this set vehicle speed is maintained. A vehicle speed control method for controlling the throttle valve opening of a vehicle prime mover is characterized in that simultaneous occurrence of a set command and a preset command is detected, and throttle valve opening control is canceled based on this detection. vehicle speed control method.