JPS60163735A - Automatically controlling device of car speed - Google Patents

Abstract

PURPOSE:To improve the safety of traveling by making the captioned device carry out canceling operation when a difference between an actual car speed and a stored car speed is above a certain value when storing a car speed by operating a command switch. CONSTITUTION:In the captioned device, when a cruise commanding signal is generated by operating a command switch 2, the car speed at the time is stored in the storing part of a microcomputer 6 as a set car speed. And, an actuator 10 is controlled in accordance with a deviation between an actual car speed detected by a car speed sensor 1 and the stored car speed, and the opening of a throttle valve is controlled through the output rod of the actuator 10. In this case, when the actual car speed is stored in a car speed storing part by operating a command switch 2, if the absolute value of difference between the actual car speed and the stored car speed, is above a certain value, the car speed storing part is judged abnormal. When the abnormality is judged, the system is canceled, or canceled after being decelerated down to a certain value.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an automatic vehicle speed control device used to automatically control the traveling speed of a vehicle to a certain set value.

(Prior Art) As a conventional automatic vehicle speed control device, there is one having the configuration shown in FIG. 1, for example.

In Fig. 1, 1 is a vehicle speed sensor that generates a signal proportional to the actual vehicle speed, 2 is a command switch that generates a cruise command signal, and this command switch 2 includes a set switch, a resume switch, and an accelerator switch. It will be done. Then, i) Outputs from the vehicle speed sensor 1 and the command switch 2 are manually inputted to the microcomputer 6 in the controller 3 via interfaces 4 and 5 in the controller 3, respectively. This microcomputer 6 stores a vehicle speed record (not shown) when the command switch 2 is operated. It has a built-in section.

Further, 10 is an actuator, and this actuator 10 is connected to the vent/help 11 as shown in FIG.
, a safety valve 12 , and a vacuum valve 13 , one end of the vent valve 11 and the safety valve 12 are open to the atmosphere, and the vacuum valve 1
One end of 3 is connected to the intake manifold (negative pressure source). Further, the other end of each valve 11, 12.
One end of the control wire 18 is connected to the other side of the diaphragm 16 (the left side in FIG. 2), and
The other end of the control wire 18 is connected to the throttle valve 1.

Furthermore, 21 is located in the controller 3 and controls the vent valve 11 on and off according to the output from the microcomputer 6, and 22 is also located in the controller 3 and controls the output from the microcomputer 6. 23 is also located in the controller 5 and is an actuator switching unit that turns on and off the power supply to the actuator 10 according to the output from the microcomputer 6. At this time, the power supply is turned on and off by a relay 2 consisting of a relay coil 25a and a relay switch Z5b.
5.

Further, 27 is a brake switch, 28 is a brake lamp, and a signal for canceling the system when the brake is operated is inputted to the microcomputer 6 via the interface 22 in the controller 3.

Furthermore, 31 is a constant voltage circuit, 32 is a reset circuit, 33
is a power supply, and 34 is a main switch for the control device.

Next, to explain the operation of the automatic vehicle speed control device having such a configuration, including FIG. 3, first, the vehicle speed sensor 1
generates a pulse proportional to the actual vehicle speed, inputs this pulse signal into the microcomputer 6 of the controller 3, samples it within a fixed period, and always makes the microcomputer 6 recognize the number of pulses proportional to the vehicle speed. In this state, for example, a set signal is output from the command switch 2 at time 1. , the bicycle computer 6 stores the number of pulses corresponding to the vehicle speed at that time in the vehicle speed storage section, and from then on, the number of pulses corresponding to the detected actual vehicle speed is changed to the stored number of pulses ( In other words, a command is sent to the actuator 10 so that the speed becomes equal to the stored vehicle speed), and the vent valve switching unit 21
and the vent valve 11 and the vacuum valve 13 through the vacuum valve switching unit 22, respectively.
By controlling on/off the actuator 10
For example, I want to control the negative pressure state in the negative pressure chambers 1 and 7 so that the actual vehicle speed is higher than the memorized vehicle speed! During interval t2,
The vent valve 11 is activated by the vent valve switching unit 22 controlled by the microcomputer 6.
is turned off, atmospheric air is introduced into the negative pressure chamber 17, and the valve shaft 12 is slightly rotated in the valve closing direction to reduce the vehicle speed. On the other hand, at time t3 when the actual vehicle speed becomes lower than the memorized vehicle speed, the vacuum valve switching unit 22 controlled by the microcomputer 6 operates to turn on the vacuum valve 13 and introduce negative pressure into the negative pressure chamber 17. As a result, the throttle valve shaft 12 is slightly rotated in the valve opening direction to increase the vehicle speed.

By repeating this operation, the vehicle speed is controlled to be constant. At this time, power is supplied to the actuator 10 via the relay 25.

However, in such conventional vehicle speed automatic control devices, when the actual vehicle speed is stored in the vehicle speed memory section, the stored vehicle speed is always considered to be appropriate, but the stored vehicle speed is not necessarily accurate. It is possible that the actual vehicle speed may not be memorized, especially when the actual vehicle speed is memorized.
If the vehicle speed is set higher than the actual vehicle speed for some reason, the vehicle speed during automatic driving will exceed the desired set speed, which may be unfavorable from a safety perspective. There was a point.

(Purpose of the Invention) This invention was made by focusing on the conventional problems as described above, and even if the stored vehicle speed is set higher than the actual vehicle speed for some reason, the The purpose of this system is to prevent the vehicle from driving at a high memorized speed, thereby further increasing driving safety.

(Structure of the Invention) The present invention includes a vehicle speed sensor that generates a signal proportional to the actual vehicle speed, a command switch that generates a cruise command signal, a vehicle speed storage unit that stores the IT speed when the command switch is operated, and a throttle valve. and a controller that sends a command to the actuator in response to a difference between the actual vehicle speed and the stored vehicle speed, wherein the actual vehicle speed is stored in the vehicle speed storage section when the command switch is operated. If the absolute value of the difference between the actual vehicle speed and the recorded vehicle speed is greater than or equal to a predetermined value (x km/hr), it is determined that there is an abnormality in the vehicle speed memory, and the system cancels or decelerates to the predetermined value. It is characterized by the provision of a fail-safe program that cancels the operation after the operation.

(Embodiment) FIG. 4 is a diagram showing an example in which a fail-safe program is provided in an automatic vehicle speed control device according to an embodiment of the present invention, and in the automatic vehicle speed control device having the configuration shown in FIGS. 1 and 2. , a pulse signal proportional to the actual vehicle speed is input from the vehicle speed sensor 1 into the microcomputer 6 via the interface 4, and this pulse signal is sampled within a certain period in the microcomputer 6 to calculate the number of pulses proportional to the actual vehicle speed. is constantly recognized by the microcomputer 6. In this state, when a set signal is sent from the command switch 2, for example, in step 101 of FIG. Memorize, step 10
2, the difference between the actual vehicle speed and the stored vehicle speed is set to a predetermined value (xkm
/hr). When the difference between the actual vehicle speed and the stored vehicle speed is smaller than the predetermined value, the system continues to operate.

- If the absolute difference (iri) between the actual vehicle speed and the stored vehicle speed is greater than a predetermined value xkm/hr, for example, when the recorded vehicle speed is larger than the actual vehicle speed by more than Xlv/hr when the vehicle speed is stored, the system is canceled. Specifically, when canceling the system, the actuator switching unit 23 is operated by the output from the microcomputer 6 to open the switch 25b of the relay 25. , turns off the power supply to the actuator 10. Also, when performing a cancel operation after decelerating to a predetermined value, the output from the microcomputer 6 turns off the pen I.
After the valve switching section 21 is activated to turn off the vent valve 11, atmospheric air is introduced into the negative pressure chamber 17 in the actuator 1o, and the actual vehicle speed is reduced to a predetermined value. The output activates the actuator switching unit 23 and the relay 2
5 open the switch 25b, actuator 1o
Turn off the power supply to.

On the other hand, when the vehicle speed tQ is more than xkm/hr two seconds shorter than the actual vehicle speed at the time of the vehicle speed record ta, the system is similarly canceled or operated in the deceleration direction.

(Effect of the invention) As explained above, according to this invention, the actual
(a vehicle speed sensor that generates a signal proportional to the vehicle speed, a command switch that generates a cruise command signal, a vehicle speed memory unit that stores the vehicle speed when the command switch described in iiiu is operated, an actuator that drives the throttle valve, and the actual vehicle speed) and a controller that sends a command to the actuator in response to the difference between the actual vehicle speed and the stored vehicle speed, wherein the absolute value of the difference between the actual vehicle speed and the stored vehicle speed is greater than or equal to a predetermined value.
2, the system is configured to cancel or decelerate, so even if the memorized vehicle speed is set higher than the actual vehicle speed for any reason, the vehicle will continue to drive at the higher memorized vehicle speed. There's nothing left to do,
This has an extremely excellent effect of further increasing driving safety.

[Brief explanation of drawings]

Fig. 1 is a block explanatory diagram showing an example of the configuration of an automatic vehicle speed control device, Fig. 2 is a cross-sectional explanatory diagram showing an example of the structure of the actuator in Fig. 1, and Fig. 3 is a time lapse showing the operating state of the automatic vehicle speed control device. The explanatory diagram, FIG. 4, is a flowchart of a fail-safe program provided in the automatic vehicle speed control device 6 in one embodiment of the present invention. 1... Vehicle speed sensor 2... Command switch 3... Controller 6... Microcomputer 10... Actuator 11... Vent valve 12... Safety valve 13... Vacuum valve 17... Negative pressure chamber 12... Throttle valve shaft 21... Vent valve switching section 22... Vacuum valve switching section 23... Actuator switching section 25... Relay 33... Power supply X...・Specified Value Patent Applicant: Yutaka Ogawa, Patent Attorney, Jidosha Electric Industry Co., Ltd. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] (1) A vehicle speed sensor that generates a signal proportional to the actual vehicle speed;
A command switch that generates a cruise command signal, a vehicle speed storage unit that stores the vehicle speed when the command switch is operated, and an actuator that drives a throttle valve; I)
η A vehicle speed automatic control device comprising: a controller that sends a command to the actuator in response to a difference between the stored vehicle speed and the stored vehicle speed; An automatic vehicle speed control device comprising a fail-safe circuit in which the system cancels or decelerates to a predetermined value and then performs a cancel operation when the difference between the vehicle speed and the vehicle speed is equal to or greater than a predetermined value.