JPH0625398Y2 - Vehicle constant-speed traveling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial field of application) The present invention relates to a constant speed traveling device for a vehicle, which performs constant speed traveling control so as to maintain a set target vehicle speed.

(Prior Art) A vehicle constant-speed traveling device uses, for example, a microcomputer as a control unit to control so as to maintain a set target vehicle speed. This microcomputer compares the actual vehicle speed of the vehicle detected by the vehicle speed sensor or the like with the set target vehicle speed, controls the vehicle in accordance with the difference between the two vehicle speeds, and maintains the actual vehicle speed at the target vehicle speed. ing. Specifically, the acceleration / deceleration control of the vehicle is performed by driving a throttle actuator to control the opening / closing of the throttle valve of the engine. A valve, a supply valve, and an air valve are used, and each of these valves is driven by a control output signal from the microcomputer. That is, all the three control signals for driving these release valve, supply valve, and air valve are all high level signals (HH
H), the throttle valves are fully closed. If all are set to low level (LLL), acceleration operation is performed, and if they are set to low high level (LHH), deceleration operation is performed and low high low level (LHH) is set. If it is set to (LHL), the throttle valve is controlled to be held and the throttle valve is maintained in the current state, and constant speed traveling is performed by these control operations.

An object of the present invention is to provide a vehicle constant speed traveling device capable of performing more optimal control in view of the above-mentioned conventional art.

[Construction of the Invention] In order to achieve the above-mentioned object, the vehicle constant-speed traveling device of the present invention has a vehicle speed sensor for detecting the traveling speed of the vehicle, a switch for setting a target vehicle speed, acceleration, deceleration, and maintenance of the vehicle speed. When a target vehicle speed is set by the switch, a plurality of valves that are operated according to each state of the above, a throttle actuator that operates by a combination of the operating states of the plurality of valves, a throttle that is controlled by the throttle actuator, Controlling the plurality of valves to control the throttle by the throttle actuator to control the vehicle at a constant speed so that the traveling speed of the vehicle is maintained at the target vehicle speed. In a vehicle constant speed traveling device, a combination of operating states of the plurality of valves is detected based on the output of the control means. Means for outputting a normal signal when it is, when the normal signal is not output, and having a means for releasing the constant-speed travel control of the vehicle by the control means.

(Operation) With the vehicle constant-speed traveling device according to the present invention, when the vehicle is controlled to travel at a constant speed by the control means, the vehicle is accelerated, decelerated, or maintained according to the output of the control means. It is possible to detect a combination of operating states of a plurality of valves that are operated accordingly. Then, when the normal signal is no longer output from the means for outputting the normal signal when the combination of the operating states of the plurality of valves is detected, the means for canceling the constant speed traveling control of the vehicle by the control means is provided. The release operation is performed.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a circuit block diagram of a vehicle constant speed traveling device according to an embodiment of the present invention. The entire operation of the vehicle constant-speed traveling device shown in FIG. 1 is controlled by the microcomputer 1. When the ignition switch 3 is turned on, the microcomputer 1 is supplied with the voltage from the power source 5 through the ignition switch 3 and the normally-closed contact 7a of the main relay 7, thereby performing a constant speed traveling control operation. There is.

The microcomputer 1 has a set switch (SE
T) 11, an accelerator switch (ACC) 13, and a resume switch (RES) 15 are connected, the other end of each of these switches is connected in common, and is connected to the power source 5 via the ignition switch 3 and these switches are connected. When is closed, the voltage of the power supply 5 is supplied to the microcomputer 1. Further, the vehicle speed signal from the vehicle speed sensor 9 is supplied to the microcomputer 1, and the microcomputer 1 obtains the actual vehicle speed of the vehicle by this vehicle speed signal.

The microcomputer 1 compares the target vehicle speed Vs set as described later with the actual vehicle speed V obtained from the vehicle speed sensor 9, and the actual vehicle speed V becomes the target vehicle speed V according to the difference between the two vehicle speeds.
The throttle actuator is driven so that the throttle valve is opened and closed to control the vehicle speed, and three valves are used to drive the throttle actuator: the release valve, the supply valve, and the air valve. The throttle actuator is driven by controlling the opening / closing operation of these valves.

The operation of these three valves will be explained. When the constant speed travel control operation is not performed, the air valve and the release valve are opened, the supply valve is closed,
As a result, the actuator does not operate, but when the vehicle is traveling at a constant vehicle speed due to the constant speed traveling control operation, the release valve closes and the actuator is operated by opening and closing the air valve and supply valve to control the vehicle speed. ing. The following table shows the open / closed state of each valve for each operating state of constant speed traveling control.

In order to drive each of the release valve, the supply valve, and the air valve, the vehicle constant-speed traveling device has a release valve solenoid 21, a supply valve solenoid 23, and an air valve solenoid 25. Each of these solenoids is a micro valve. Computer 1 to inverters 31, 33, 35 and transistors 41, 4
It is driven via 3, 45.

In the release valve and the air valve, when a low level signal is supplied from the microcomputer 1 to the inverters 31 and 35, the transistors 41 and 45 operate with the high level signal inverted by the inverter,
As a result, the release valve solenoid 21 and the air valve solenoid 25 are actuated to be in a closed state, and when the supply valve supplies a low level signal from the microcomputer 1 to the inverter 33, the transistor 43 operates, which causes The supply valve solenoid 23 operates to open.

Then, as can be seen from the above table, the inverters 31 and 3 corresponding to the release valve solenoid 21, the supply valve solenoid 23, and the air valve solenoid 25.
3 and 35, the control signals supplied from the microcomputer 1 are respectively applied to the release valve control signal S
r, the supply valve control signal Ss, and the air valve control signal Sa, these control signals Sr, Ss,
When all of Sa are high level signals (HHH), the full-close command is issued, the constant speed traveling control operation is not activated, and when the control signals Sr, Ss, Sa are all low level signals (LLL), When the control signals Sr, Ss, Sa are respectively low, high, and high levels (LHH), the acceleration command becomes an acceleration command in the constant speed traveling control operation, and the deceleration command becomes a deceleration command. , High, low and level signals (LHL), a hold command is issued and the current throttle valve position is held.

The operating voltage for the release valve solenoid 21, the supply valve solenoid 23, and the air valve solenoid 25 is the normally closed contact 2 of the actuator power relay 27.
7a, a normally closed clutch switch 29, a brake switch 47, a normally closed contact 7a of the main relay 7 and an ignition switch 3 to supply power.
Normally closed contact 7a, brake switch 47, clutch switch 29, normally closed contact 27a in this operating voltage supply path
When any of the solenoids is opened, each solenoid 21, 23, 2
In reference numeral 5, the voltage supply is cut off even during operation due to the constant speed traveling control, the state becomes inoperative, and the constant speed traveling control operation is released. That is, when the brake switch 47 and the clutch switch 29 are operated, the constant speed traveling control operation is released. In the present embodiment, the case of a manual vehicle is taken as an example, and the constant speed traveling control operation is released when the clutch operates in this case. However, in the case of an automatic vehicle, instead of the clutch switch 29, for example, Connect the normally-closed contact of the constant-speed drive control cut relay to drive the constant-speed drive control cut relay and open the normally-closed contact when the shift lever of the automatic vehicle is operated to the parking position or the neutral position. Will be performed.

The actuator power supply relay 27 and the main relay 7 are driven by a transistor 49, and the transistor 49 is driven by the output signal of the OR circuit 61 via an integrator circuit including an inverter 59, a resistor 63 and a capacitor. The inputs of the OR circuit 61 are connected to the outputs of the AND circuits 51, 53, 55 and 57.
The inputs of these AND circuits 51, 53, 55 and 57 are from the microcomputer 1 to the inverters 31 and 3.
Release valve control signal S supplied to 3, 35
r, the supply valve control signal Ss, and the air valve control signal Sa are supplied.
1 is a control signal Sr, S from the microcomputer 1.
The fully closed command is detected and output from s and Sa, the AND circuit 53 outputs an acceleration command, the AND circuit 55 outputs a deceleration command, and the AND circuit 57 outputs a hold command.

When any one of the above-mentioned full-close command, acceleration command, deceleration command, and hold command for constant speed traveling control is output from the AND circuits 51, 53, 55, 57, these command signals are The signal is supplied from the OR circuit 61 to the inverter 59 through the integrating circuit and is supplied to the base of the transistor 49 as a low level signal inverted by the invertor 59, so that the transistor 49 becomes inoperative.
The actuator power supply relay 27 and the main relay 7 are not driven, and the operating voltage is normally supplied to the solenoids 21, 23 and 25.

However, the control signals Sr, Ss, S supplied from the microcomputer 1 to the inverters 31, 33, 35 are
If the command signal composed of the combination of a is a signal other than the full-close command, the acceleration command, the deceleration command, and the hold command, no signal is output from any of the AND circuits 51, 53, 55, 57. The output of the circuit 61 becomes low level, and this low level signal is inverted by the inverter 59 to drive the transistor 49 as a high level signal, so that the actuator power supply relay 27 and the main relay 7 are activated, and the normally closed contact 27a and The normally closed contact 7a is opened, the operating voltage to each solenoid 21, 23, 25 is cut off, and the constant speed traveling control operation is released, and
Further, the microcomputer 1 is reset to the initial state when the operating voltage is cut off. More specifically, signals for driving the release valve solenoid 21, the supply valve solenoid 23, and the air valve solenoid 25 via the inverter and the transistor are determined by a combination of three control signals Sr, Ss, Sa from the microcomputer 1. This combination is made from 2 to the third power, and there are 8 types of combinations, but in constant speed traveling control, the fully closed command, acceleration command, deceleration command consisting of the above-mentioned 4 types of these 8 types of combinations. ,
Only hold command is used. Therefore, when a signal other than the command signal for constant speed traveling control is output from the microcomputer 1, the circuit including the AND circuits 51-57 and the OR circuit 61 outputs the actuator power supply relay 27 and the main relay 7 via the transistor 49. Is driven to make each solenoid inoperative, thereby canceling the constant speed traveling control operation and resetting the microcomputer 1.

Next, the operation will be described.

The ignition switch 3 is turned on and the main relay 7
When the operating voltage from the power source 5 is supplied to the microcomputer 1 through the normally closed contact 7a, the microcomputer 1 executes constant speed traveling control. When the accelerator pedal is depressed to reach a desired vehicle speed during the constant speed traveling control operation, the set switch 11 is operated to read the vehicle speed at this time into the microcomputer 1 and set it as the target vehicle speed Vs.

The microcomputer 1 compares the target vehicle speed Vs with the actual vehicle speed V read from the vehicle speed sensor 9, and as shown in the above-mentioned table, the release valve, the supply valve,
The control signals Sr, Ss, Sa are output to control the opening and closing of the air valves so that the actual vehicle speed V becomes the target vehicle speed Vs.
The release valve solenoid 21, the supply valve solenoid 23, and the air valve solenoid 25 are driven by the control signals Sr, Ss, and Sa, respectively, and thereby a constant speed traveling control operation is performed.

During such a constant speed traveling control operation, when the accelerator pedal is depressed, the vehicle is accelerated, but when the accelerator pedal is released, the vehicle speed returns to the original set target vehicle speed Vs, and the accelerator switch 13 is continuously pressed. Is accelerated,
When the accelerator switch 13 is released when the desired vehicle speed is reached, the vehicle speed at this time is set as the target vehicle speed Vs. Further, if the set switch 11 is continuously pressed during the constant speed running control operation, the engine is decelerated, and when the desired vehicle speed is reached, the set switch 11 is released to set the vehicle speed at this time. When the brake pedal is depressed to decelerate and the set switch 11 is pressed and released when the vehicle speed reaches the desired vehicle speed, the vehicle speed at this time is set. When the resume switch 15 is continuously pressed, the engine brake continues to decelerate during this period, and when the resume switch 15 is released, the vehicle automatically accelerates and returns to the original target vehicle speed Vs. When the resume switch 15 is pressed and released after the brake pedal is depressed to decelerate, the vehicle automatically accelerates to the original target vehicle speed Vs.

In this constant speed traveling control operation state, the operating voltage for the solenoids 21, 23, 25 is supplied from the power source 5 through the ignition switch 3, the normally closed contact 7a, the brake switch 47, the clutch switch 29, and the normally closed contact 27a. It is supposed to be done.

The combination of the control signals Sr, Ss, Sa output from the microcomputer 1 for driving each solenoid in this constant speed traveling control operating state is H
There are only four command signals consisting of a combination of HH, LLL, LHH, and LHL levels, that is, a fully closed command, an acceleration command, a deceleration command, and a hold command, and when the control signal of this combination is output from the microcomputer 1. Any of the AND circuits 51, 53, 55, 57 generates an output signal in response to the control signal of this combination, thereby suppressing the transistor 49 in the inoperative state, and the operating voltage for each solenoid is not cut off. Is controlled like
When a control signal other than the above combination is output from the microcomputer 1, no signal is output from any of the AND circuits 51 to 57, so the output of the OR circuit 61 becomes low level, and this low level output signal is integrated. After passing through the circuit, it is inverted into a high level signal by the inverter 59, and the high level signal activates the transistor 49, whereby the actuator power supply relay 27 and the main relay 7 operate, and the normally closed contact 27a and the normally closed contact 7a are activated. When opened, the operating voltage to the solenoids 21, 23, 25 is cut off, the constant speed traveling control operation is released, and the microcomputer 1 is reset so that the vehicle can travel under normal control. The OR circuit 61
Resistor 63 and capacitor 65 connected to the output of
The integrator circuit consisting of (1) serves to eliminate unnecessary pulses such as "whiskers" due to a very slight time difference between signals when each command signal output from the AND circuit changes.

[Effect of the Invention] As described above, according to the present invention, whether the combination of the operating states of the plurality of valves provided in the throttle actuator is normal based on the output of the control means for controlling the vehicle to run at a constant speed. It is possible to monitor whether or not it is possible to detect whether the combination of the operating states of the plurality of valves is normal, and the constant speed traveling control of the vehicle by the control means is canceled. It is possible to avoid a state where the traveling control is continued while being unstable.

[Brief description of drawings]

FIG. 1 is a block diagram of a vehicle constant speed traveling device according to an embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Microcomputer 7 ... Main relay 11 ... Set switch 13 ... Accelerate switch 15 ... Resume switch 21-25 ... Solenoid for each valve 27 ... Actuator power supply relay 51-57 ... AND circuit

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Koichi Suzuki, 2 Takara-cho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (72) Kinichiro Nakano 2- Takara-cho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (72) Inventor Hiroyuki Nomura 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (72) Isao Yamamoto 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd. (72) Inventor, Kiyoshi Yoshida 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd. (56) Reference JP-A-57-199012 (JP, A)

Claims (1)

[Scope of utility model registration request] 1. A vehicle speed sensor for detecting a traveling speed of a vehicle, a switch for setting a target vehicle speed, a plurality of valves operated according to each state of acceleration, deceleration and maintenance of the vehicle speed, and the plurality of valves. When the target vehicle speed is set by the switch, the throttle actuator is operated by the combination of the operating states of the above, and when the target vehicle speed is set by the switch, the plurality of valves are controlled to control the throttle by the throttle actuator. By doing so, in a vehicle constant speed traveling device having a control means for controlling the vehicle at a constant speed so that the traveling speed of the vehicle is maintained at the target vehicle speed, based on the output of the control means, A means for outputting a normal signal when a combination of operating states of multiple valves is detected, and the normal signal A constant speed traveling device for a vehicle, comprising means for canceling the constant speed traveling control of the vehicle by the control means when the output is stopped.