JPH01223034A - Control system for constant speed drive equipment of vehicle - Google Patents

Abstract

PURPOSE:To improve the convergence characteristics to a target vehicle speed by taking initializing periods specifically determined according to the actual vehicle speed and the target vehicle speed to make the acceleration control on the criterion whether the actual speed of the vehicle at the input time of the resume signal is higher or lower than the target speed. CONSTITUTION:A main switch 2, a vehicle speed sensor 3, a setting switch 4 and a resume switch 5 are connected in series to a controller 1. On the other hand an actuator 6 consists of both an operating member 10 connected to a motor 7 and a throttle valve and a magnet clutch 11 which is selectively connected to the motor 7 or the operating member 10. A driving circuit 12 drives the actuator 6 when receiving the signal from the controller 1. When the actual vehicle speed at the starting point of the resuming function is lower, for example, than the target vehicle speed, the initializing processing is executed in the time which is longer than the initializing time determined according to the actual vehicle speed and shorter than the initializing time determined according to the target vehicle speed.

Description

[Detailed Description of the Invention] [Object of the Invention] <Industrial Application Field> The present invention is capable of constant speed driving to maintain the actual vehicle speed at the target vehicle speed, and also enables signal input from the resume switch after cancellation. The present invention relates to a control system for a constant-speed traveling device for a vehicle that returns the actual vehicle speed to the target vehicle speed again to perform constant-speed traveling.

<Prior Art> Generally, in a constant speed traveling device for a vehicle, the current vehicle speed is stored as a target vehicle speed in response to a signal input from a set switch, and the target vehicle speed is maintained thereafter to perform constant speed traveling. Furthermore, even if the constant speed driving state is once canceled by operating the brake, for example, by operating the resume switch, the constant speed driving state can be resumed at the target vehicle speed before cancellation.

When this cancellation process is performed, it is necessary to free the actuator wire connected to the throttle valve so as not to interfere with opening and closing of the throttle valve by accelerator operation. Therefore, at the start of resume, initialization processing is performed on the actuator in order to smoothly switch from the accelerator operation state to actuator control.

This initialization process at the time of resuming is carried out, for example, by using the initialization time of the target vehicle speed, but if the actual vehicle speed at the start of resume is considerably lower than the target vehicle speed, the opening degree corresponding to the actual vehicle speed may be used. Since the throttle valve is opened wide and a large initial acceleration is generated, an overshoot phenomenon occurs and the vehicle speed converges to the target vehicle speed. In addition, there is a control system that uses the initialization time based on the actual vehicle speed, which changes length depending on the actual vehicle speed, as the initialization time at the start of resume. If the vehicle speed is considerably low, the initialization time is also short, and the opening degree of the throttle valve due to initialization is small, resulting in an undershoot phenomenon caused by a small initial acceleration and convergence to the target vehicle speed.

In this way, in any case, if the actual vehicle speed at the start of resume is considerably lower than the target vehicle speed, overshoot or undershoot will occur, so the convergence until returning to the target vehicle speed is This is worse than a case close to , and the convergence will vary depending on the actual vehicle speed at the start of resume, which may cause discomfort during operation.

<Problems to be Solved by the Invention> In view of the problems of the prior art, the main object of the present invention is to change the actual vehicle speed to the target vehicle speed before cancellation by inputting a resume signal after canceling constant speed driving. It is an object of the present invention to provide a control system for a constant speed traveling device for a vehicle that can eliminate the discomfort caused by a difference in convergence due to a difference in actual vehicle speed at the start of resume when returning the vehicle.

[Structure of the Invention] <Means for Solving the Problems> According to the present invention, the present invention provides a control means that performs calculation control to maintain the actual vehicle speed at the target vehicle speed and generates an acceleration/deceleration control signal; and a drive circuit for driving an actuator that performs a vehicle speed control operation based on the control signal,
Constant-speed running for a vehicle in which the control means memorizes a target vehicle speed by inputting a set signal, and controls the constant-speed running at the target vehicle speed before cancellation by inputting a resume signal after canceling constant-speed running. In the control system of the device, when the actual vehicle speed at the time of inputting the resume signal is lower than the target vehicle speed, the control means sets an initialization time and a target value based on the actual vehicle speed, which changes in length depending on the height of the actual vehicle speed. The actuator has an initialization time that is the average of the initialization time based on the vehicle speed, and when the actual vehicle speed at the start of resume is equal to or higher than the target vehicle speed, the actuator has an initialization time that does not exceed the initialization time based on the target vehicle speed. This is achieved by providing a control system for a constant speed vehicle for a vehicle, which is characterized in that it generates an acceleration control signal.

In this way, when the actual vehicle speed at the start of resume is lower than the target vehicle speed, the initialization time based on the actual vehicle speed, which varies depending on the height of the actual vehicle speed, and the initialization time based on the target vehicle speed. By setting the average as the initialization time at the start of resume, the initialization time is longer than the initialization time based on the actual vehicle speed, so acceleration can be improved by a large initial acceleration, and the initialization time is longer than the initialization time based on the actual vehicle speed. Since the time is shorter than the initialization time based on the target vehicle speed, no sudden acceleration occurs. In addition, if the actual vehicle speed at the time of restarting is equal to or higher than the target vehicle speed, the initialization time based on the target vehicle speed will not exceed the initialization time at the time of resume, so the initialization process will be performed without increasing the throttle valve opening too much. This allows the vehicle speed to smoothly converge to the target vehicle speed.

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

FIG. 1 is a circuit diagram showing a general configuration of a constant speed traveling device for an automobile based on the present invention. A control section 1, which serves as a control means having a CPU that performs arithmetic processing for constant speed traveling and an input/output interface, is connected via a main switch 2 to a power source (not shown) that serves as a power source. Further, the control unit 1 is input with, for example, a pulse signal from a vehicle speed sensor 3 as a vehicle speed signal, and also has a set switch 4 for operating when setting the actual vehicle speed as a target vehicle speed during constant speed driving, and a constant speed A resume switch 5, which is operated when returning the vehicle to the target vehicle speed after canceling travel, is connected in parallel with the main switch 2, respectively.

The actuator 6 in this embodiment includes a motor 7 as a drive source, an actuating member 10 connected to the throttle valve 8 via an actuator wire 9, and a mechanism for selectively connecting the motor 7 and the actuating member 10. It has a magnetic clutch 11 of +14. Therefore, when the magnetic clutch 11 is in the connected state, the throttle valve 8 is interlocked with the rotation of the motor 7.

In the drive circuit 12 for driving the actuator 6 by the signal from the control section 1 described above, as shown in the figure, a transistor bridge circuit of a known type consisting of four transistors Q1 to Q4 is used to control the motor 7. A reverse rotation drive circuit is configured, and a transistor Q5 for controlling the excitation coil 13 of the magnetic clutch 11 on and off is provided.

In the bridge circuit described above, the emitters of transistors Q1 and Q2 that are parallel to each other are connected to the power supply terminal ■, and the emitters of transistors Q3 and Q4, whose collectors are connected to the collectors of transistors Q1 and Q2, respectively, are connected to the power supply terminal ■. It is grounded via the control unit 1. These transistors Q1
, Q3 and the collectors of the transistors Q2, Q4, a normally closed limit switch 14.
15, both terminals of the motor 7 are connected. Therefore, by supplying an ON signal to the transistors Q1 and Q4 from the control unit 1, the motor 7 rotates in a direction that drives the actuating member 10 to the acceleration side, which is the fully closed side of the throttle valve 8, or the transistors Q2 and Q3 By supplying an ON signal to the motor 7, the motor 7 rotates in a direction that drives the actuating member 10 toward the deceleration side.

In addition, each limit is set so that the limit switch 14 is opened when the actuating member 10 reaches the operating limit on the acceleration side, and the limit switch 15 is opened when the actuating member 10 reaches the operating limit on the deceleration side. Switches 14.15 are set. Furthermore, the limit switch 14 is connected in parallel with a diode D1 that allows a deceleration drive current to flow through the motor 7, and the limit switch 15 is connected in parallel with a diode D2 that allows an acceleration drive current to flow through the motor 7.

By doing so, over-rotation of the motor 7 can be suitably prevented.

Next, the operation procedure according to this embodiment will be described below.

By turning on the main switch 2, voltage is supplied to the control unit 1, and the constant speed traveling device becomes ready. When it is desired to drive the vehicle at a constant speed from this state, the throttle valve 8 is opened and closed using an accelerator (not shown), and the set switch 4 is turned on at the desired actual vehicle speed. The control unit 1 stores the actual vehicle speed at the time of setting as the target vehicle speed, and thereafter drives the actuator 6 to control the opening and closing of the throttle valve 8 so as to maintain the actual vehicle speed at the target vehicle speed, thereby performing constant speed driving. Can be done.

Incidentally, when the vehicle is not traveling at a constant speed, the magnetic clutch 11 is disengaged to free the actuating member 10 and the actuator wire 9 so as not to interfere with accelerator operation. Therefore, when starting constant speed driving, by initializing and driving the actuating member 10 in advance by an amount corresponding to the opening degree of the throttle valve 8 at that time, it is possible to smoothly switch to the constant speed driving state. As shown by the dashed line in FIG. 2, the initialization process at the time of setting is performed by initially driving the motor 7 with an initialization time based on the actual vehicle speed, which changes in length or shortness in proportion to the height of the actual vehicle speed. The opening amount of the throttle valve 8 is ensured to match the actual vehicle speed.

Next, when a brake operation is performed to decelerate while driving at a constant speed, the constant speed driving state is canceled once. For example, the target vehicle speed before cancellation is stored until the vehicle speed drops below a predetermined speed. By turning on the resume switch 5, the vehicle can return to the constant speed running state again. At this time, an initialization signal is supplied from the control section 1 to the motor 7 in the same manner as when setting.

During this initialization time at the start of resume, the target vehicle speed (V5) is set by brake operation as described above.
For example, when the actual vehicle speed in the figure is ■1>, the initialization time (T1) based on the actual vehicle speed becomes lower.
and the initialization time ('1'' s >) based on the target vehicle speed shown by the two-dot chain line in the figure.For example, as shown by the solid line in the figure, it is 1/2 of the sum of the two. Good. Therefore, as in the case of using the initialization time (Ts) based on the target vehicle speed,
This may occur if the opening degree of the throttle valve 8 becomes too large relative to the actual vehicle speed (Vl), resulting in a large initial acceleration, resulting in a tendency to overshoot, or if the initialization time (G1) based on the actual vehicle speed is used. , the target vehicle speed (Vs
) Due to the small initial acceleration due to the opening of the throttle valve 8 which is too small compared to ), there will be a slight undershoot.
It is possible to eliminate such discomfort.

Further, in this embodiment, after the actual vehicle speed increases due to, for example, a long downhill run and the cancellation process is performed in the same manner as described above,
When the actual vehicle speed at the start of resume is equal to or higher than the target vehicle speed, such as when the resume switch 5 is turned on to return to constant speed driving again, the initialization time is based on the target vehicle speed, as shown by the solid line in the figure. The initialization time (Ts>) is set to be the same as the initialization time (Ts>).

Therefore, the vehicle speed can be smoothly converged to the target vehicle speed by applying appropriate engine braking based on the opening degree of the throttle valve 8 corresponding to the target vehicle speed (Vs).

Furthermore, as shown in Fig. 2, a vehicle speed (Vp) that is higher than the target vehicle speed (Vs) by a predetermined value is set as a switching point for initialization/non-initialization, and when the actual vehicle speed at the start of resume is equal to or higher than this switching point, The initialization time is set to 0. By doing this, when the actual vehicle speed (■2) at the start of resume is equal to or higher than the vehicle speed (Vp) at the switching point.

At the beginning, the throttle valve 8 is in a fully closed state, and a powerful engine brake can be used to quickly decelerate the vehicle.

After performing the above-described initialization process, normal constant speed driving control is performed to continue controlling the actual vehicle speed to maintain it at the target vehicle speed.

In this embodiment, the initialization time at the start of resume when the actual vehicle speed is lower than the target vehicle speed is the sum of the initialization time based on the actual vehicle speed and the initialization time based on the target vehicle speed. I set it to 1/2, but
It is not limited to this, but it may be a weighted average of both,
Furthermore, control can be performed using a polygonal line shape by changing the weight depending on the section.

[Effects of the Invention] As described above, according to the present invention, when the actual vehicle speed at the start of resume is lower than the target vehicle speed, the initialization time is longer than the initialization time based on the actual vehicle speed and the initialization time is based on the target vehicle speed. Since the initialization process is performed in a shorter time than the actual vehicle speed, the actual vehicle speed can be smoothly converged to the target vehicle speed by quickly accelerating with an appropriate initial acceleration.

Furthermore, when the actual vehicle speed at the start of resume is equal to or higher than the target vehicle speed, initialization processing is performed to prevent the throttle valve from opening too much, so that the vehicle speed can similarly smoothly converge to the target vehicle speed, which is extremely effective.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a circuit diagram showing a general configuration of a constant speed traveling device for an automobile based on the present invention. FIG. 2 is a diagram showing the initialization time depending on the actual vehicle speed at the time of starting resume based on the present invention. 1...Control unit 2...Main switch 3.
...Vehicle speed sensor 4...Set switch 5...
Resume switch 6... Actuator 7... Motor 8... Throttle valve 9... Actuator wire 10...
Operating member 11...Magnetic clutch 12...
・Drive circuit 13...excitation coil 111.15・
...Limit 1 - Switch Patent Applicant: Mitsuba Electric Manufacturing Co., Ltd. Attorney: Yo Oshima - Figure 2

Claims (1)

[Scope of Claims] A control means that performs arithmetic control to maintain an actual vehicle speed at a target vehicle speed and generates an acceleration/deceleration control signal, and a drive circuit that drives an actuator that performs a vehicle speed control operation based on the control signal. and the control means stores a target vehicle speed by inputting a set signal, and controls the vehicle to travel at a constant speed at the target vehicle speed before cancellation by inputting a resume signal after canceling constant speed traveling. In the control system for a constant speed traveling device, the control means performs initialization based on the actual vehicle speed, which changes length depending on the height of the actual vehicle speed, when the actual vehicle speed at the time of inputting the resume signal is lower than the target vehicle speed. The initialization time is the average of the time and the initialization time based on the target vehicle speed, and if the actual vehicle speed at the time of resume start is higher than the target vehicle speed, the initialization time does not exceed the initialization time based on the target vehicle speed. A control system for a constant speed traveling device for a vehicle, characterized in that an acceleration control signal is generated to the actuator at certain times.