JPH0764227B2 - Control system for constant-speed traveling equipment for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application] The present invention relates to a control system for a vehicle constant speed traveling device,
Improves the convergence of the target vehicle speed from a particularly high vehicle speed when driving at a constant speed at the target vehicle speed before cancellation by a resume signal input after canceling the constant speed traveling or when traveling at a target vehicle speed after overtaking The present invention relates to a control system for a constant speed traveling device for a vehicle.

<Prior Art> Generally, in a vehicle constant-speed traveling device, an actual vehicle speed at that time is stored as a target vehicle speed by a signal input from a set switch, and an actuator cable is attached to a throttle valve so that the target vehicle speed is maintained thereafter. Some actuators are connected via the drive control by arithmetic control based on the difference between the actual vehicle speed and the target vehicle speed to perform constant speed traveling. Also, if the brake pedal or the like is operated during constant speed traveling, the constant speed traveling state is temporarily canceled, but by operating the resume switch, constant speed traveling is performed again at the target vehicle speed before cancellation. You can When such a cancellation process is performed, the actuator is set in a free state so that the opening / closing of the throttle valve by the accelerator operation is not hindered.

When the resume process is performed at a high vehicle speed that exceeds the above-mentioned calculation control area, the accelerator is fully closed until the actual vehicle speed falls within the calculation control area, and the vehicle is decelerated quickly. The actual vehicle speed is controlled so as to converge to the target vehicle speed by the normal calculation control for the previous target vehicle speed. By the way, since the control amount in the calculation control area is relatively small, if there is a large amount of play in the actuator cable for some reason, it will take time to pull out the play, which delays the opening of the throttle valve. Therefore, when it converges to the target vehicle speed, an undershoot and an overshoot as its reaction occur,
There is a problem that the convergence at the time of resume processing from a high vehicle speed deteriorates. Further, when the vehicle speed converges to the target vehicle speed after overtaking, the convergence is also poor. In order to solve the above-mentioned problem, it is sufficient to reduce the play of the actuator cable, but the assembly and adjustment work of the actuator cable becomes complicated,
It was not preferable.

<Problems to be Solved by the Invention> In view of the problems of the prior art as described above, the main object of the present invention is to perform a resume process at a high vehicle speed exceeding an arithmetic control area, or to pass. It is an object of the present invention to provide a control system for a vehicle constant-speed traveling device that can improve convergence with respect to a target vehicle speed.

[Configuration of the Invention] <Means for Solving the Problem> According to the present invention, the object of the present invention is to perform arithmetic control based on the difference between the actual vehicle speed and the target vehicle speed in the vicinity of the target vehicle speed in order to perform constant speed traveling. And a control means for generating an acceleration / deceleration control signal and generating a deceleration control signal for fully closing the throttle valve when the actual vehicle speed reaches a predetermined vehicle speed higher than the target vehicle speed, and an actuator cable for the throttle valve. In a control system for a vehicle constant-speed traveling device having an actuator that is connected via a control signal and performs a vehicle speed control operation based on the control signal, the control means fully closes the throttle valve for a given target vehicle speed. When the actual vehicle speed reaches a predetermined vehicle speed higher than the target vehicle speed in the process of controlling the vehicle speed from the high vehicle speed to the target vehicle speed to generate a deceleration control signal for setting It is achieved by providing a control system of a vehicle for constant speed running apparatus characterized by generating an acceleration control signal.

<Operation> As described above, when the actual vehicle speed reaches a predetermined vehicle speed higher than the target vehicle speed when the vehicle speed is reduced from a high vehicle speed that generates a deceleration control signal for fully closing the throttle valve to the target vehicle speed. By performing the predetermined acceleration control on the actuator, it is possible to pull the play of the actuator cable, so the response of the throttle valve in the subsequent arithmetic control to bring the actual vehicle speed close to the target vehicle speed is improved, and the target vehicle speed is improved. When the actual vehicle speed converges, it is possible to prevent undershoot caused by response delay due to play of the actuator cable and overshoot caused by its reaction.

<Embodiment> Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a wiring and piping diagram schematically showing an embodiment of a constant speed traveling device to which the present invention is applied. A negative pressure drive type actuator 2 in the engine room of an automobile 1 as a vehicle
Is arranged, and the actuator 2 and the accelerator pedal 3 are connected to each other via an actuator cable 4. The accelerator pedal 3 has a throttle cable 5
The cables 4 and 5 are connected in parallel to an accelerator pedal link of a known structure of the accelerator pedal 3 via a throttle valve 6.

The actuator 2 is connected to the engine 8 via the negative pressure introducing pipe 7.
It is connected to the intake pipe of No. 1 and is selectively driven by negative pressure by intake negative pressure, and as shown in FIG. It has a biased diaphragm 11. Negative pressure chamber 12 bounded by diaphragm 11 of actuator 2
One end of each of three electromagnetic valves including a vacuum valve 13, a vent valve 14, and a safety valve 15 is in communication with each other. A link member 15 is fixed to the center of the diaphragm 11, and one end of the actuator cable 5 is connected to the link member 16. The link member 16 moves according to the magnitude of the negative pressure in the negative pressure chamber 12, and the accelerator pedal 3 is driven via the actuator cable 5 to control the opening / closing of the throttle valve 6.

The other end of the vacuum valve 13 is connected to the intake pipe of the engine 8 through the above-mentioned negative pressure introducing pipe 7 and the check valve 17 provided in the middle of the pipe, and the negative valve is opened by the person who opens the vacuum valve 13. Increase the negative pressure in the pressure chamber 12,
The movement of the diaphragm 11 can open the throttle valve 6 to increase the vehicle speed. An accumulator 18 is provided between the check valve 17 and the vacuum valve 13 of the negative pressure introducing pipe 7.
Are connected to each other, so that the negative pressure to be introduced into the negative pressure chamber 12 can be stored.

The other end of the vent valve 14 communicates with the atmosphere through the air filter 19, and the vent valve 14 is opened to open the negative pressure chamber.
The negative pressure of 12 can be reduced, and the movement of the diaphragm 11 can reduce the vehicle speed. The safety valve 15 communicates with the atmosphere via the air filter 19 similarly to the vent valve 14, and releases the operation of the constant speed traveling device or detects any abnormality and functions of the constant speed traveling device. Is opened to stop the negative pressure chamber 12 and communicates the negative pressure chamber 12 with the atmosphere.

Each of the valves 13 to 15 described above is selectively excited by a control unit 20 having a CPU that performs arithmetic control and an electromagnetic valve drive circuit. This control unit
20, a main switch 21 for power supply, a set switch 22 for storing the actual vehicle speed during traveling as a target vehicle speed during constant-speed traveling, and a resume means for performing constant-speed traveling again after canceling the constant-speed traveling. Resume switch 23 as an input switch, a cruise lamp 24 for displaying a constant speed running state, and a vehicle speed sensor 25 for detecting the vehicle speed.
, A brake switch 26 for canceling the constant speed running control linked to the brake pedal, an inhibitor switch 27 for canceling the constant speed running control according to the shift position in the automatic vehicle, and an engine overspeed An IG pulse sensor 28 for canceling the constant speed traveling control by detecting it is electrically connected. In a manual vehicle, a clutch switch for canceling the constant speed traveling control in response to the operation of the clutch pedal is connected.

The operation procedure of the constant speed traveling device configured as above will be described below.

When the main switch 21 is turned on, the power supply voltage is supplied to the control unit 20, the constant speed traveling device is in a ready state, the cruise lamp 24 is turned on, and when the constant speed traveling is performed from this state, The set switch 22 is turned on at the actual vehicle speed. The CPU of the control unit 20 stores the actual vehicle speed at the time of setting as the target vehicle speed during constant speed running, and thereafter keeps the actual vehicle speed at the target vehicle speed.
The valves 13 to 15 are driven to open / close the throttle valve 6 by the actuator 2 to run at a constant speed. In the normal constant speed traveling control state, for example ± 7km / h to the target vehicle speed
Within the calculation control area of the range, the opening / closing control of the throttle valve 6 is performed by a function based on the difference between the actual vehicle speed and the target vehicle speed.

By the way, the constant speed traveling state is canceled by operating the brake pedal during constant speed traveling, and after the cancel processing, the resume means for restarting the constant speed traveling at the target vehicle speed given before the processing is the resume switch. 23 and the vehicle speed storage circuit in the control unit 20 are combined.

As shown in FIG. 3, when the resume switch 23 is turned on again in order to perform constant speed traveling again after the vehicle speed exceeds the upper limit vehicle speed under calculation control, the actual vehicle speed is compared with the target vehicle speed in that state. Since it is high, to reduce the actual vehicle speed promptly,
First, the throttle valve 6 is fully closed. Next, when the actual vehicle speed decreases and reaches the arithmetic control upper limit vehicle speed, a predetermined acceleration Ta (for example, 300 to 400
The control unit 20 outputs a drive signal for opening the vacuum valve 13 for msec). Therefore, when the throttle valve 6 is switched from the fully closed state, that is, the accelerator off state to the normal calculation control, the play of the actuator cable 4 can be pulled, and the throttle valve 6 can be immediately opened / closed in the calculation control thereafter. You can Therefore, the actual vehicle speed can be stably and swiftly converged toward the target vehicle speed without causing undershoot and overshoot when the conventional cable play is large as shown by an imaginary line. Also, when overtaking and the vehicle speed converges from the high vehicle speed exceeding the calculation control area to the target vehicle speed, the actual vehicle speed is stable and fast toward the target vehicle speed without causing undershoot and overshoot. Can be converged to

Further, the initialization process for the target vehicle speed at the time of resume can be performed faster after the actual vehicle speed reaches near the target vehicle speed. Conventionally, the control for pulling the play of the actuator cable was performed by normal calculation control.Therefore, in addition to the switching vehicle speed for initialization processing, the vehicle speed for switching between accelerator off control and calculation control is set at a higher vehicle speed. Was there. According to the present invention, it is only necessary to set the arithmetic control upper limit vehicle speed, acceleration control for pulling the play of the actuator cable can be performed, and the ROM capacity in the constant area can be small. The cost reduction can be improved.

In addition, according to the present invention, not only the negative pressure type actuator of the above-described embodiment but also a motor drive type actuator can be similarly applied.

EFFECTS OF THE INVENTION According to the present invention, when the target vehicle speed is converged from a high vehicle speed that generates a deceleration control signal for fully closing the throttle valve, a predetermined vehicle speed is reached before the target vehicle speed is reached. Since the acceleration of the actuator cable is pulled and the play of the actuator cable is pulled, the responsiveness of the opening and closing of the throttle valve due to the subsequent arithmetic control is improved, and there is no overshoot due to undershoot and its reaction when reaching the target vehicle speed. Since good control can be performed, ride comfort in resume processing from a high speed range is improved. Further, since it is not necessary to perform the assembly adjustment for reducing the play of the actuator cable, the assembly adjustment work of the actuator cable can be simplified.

[Brief description of drawings]

FIG. 1 is a wiring and piping diagram schematically showing an embodiment of a constant speed traveling device to which the present invention is applied. FIG. 2 is a diagram schematically showing an actuator of a constant speed traveling device to which the present invention is applied. FIG. 3 is a time chart based on the present invention. DESCRIPTION OF SYMBOLS 1 ... Automotive, 2 ... Actuator 3 ... Accelerator pedal 4 ... Actuator cable 5 ... Throttle cable 6 ... Throttle valve, 7 ... Negative pressure introduction pipe 8 ... Engine, 9 ... Housing 10 ... Coil spring, 11 ... Diaphragm 12 ... Negative pressure chamber , 13 ... Vacuum valve 14 ... Vent valve, 15 ... Safety valve 16 ... Link member, 17 ... Check valve 18 ... Accumulator, 19 ... Air filter 20 ... Control unit 21 ... Main switch, 22 ... Set switch 23 ... Resume switch 24 ... Cruise lamp, 25 ... Vehicle speed sensor 26 ... Brake switch 27 ... Inhibitor switch 28 ... IG pulse sensor

Claims (1)

[Claims] 1. In order to perform constant speed traveling, near the target vehicle speed, arithmetic control is performed based on the difference between the actual vehicle speed and the target vehicle speed to generate an acceleration / deceleration control signal, and the actual vehicle speed is higher than a predetermined vehicle speed higher than the target vehicle speed. A vehicle having a control means for generating a deceleration control signal for fully closing the throttle valve when it reaches the limit, and an actuator connected to the throttle valve via an actuator cable and performing a vehicle speed control operation based on the control signal. In a control system for a constant-speed traveling device for a vehicle, the control means performs speed control from a high vehicle speed to a target vehicle speed for generating a deceleration control signal for fully closing the throttle valve for a given target vehicle speed. In the process, a predetermined acceleration control signal is generated when the actual vehicle speed reaches a predetermined vehicle speed higher than the target vehicle speed. Stem.