JPH01223035A - Control system for constant speed drive equipment of vehicle - Google Patents

Abstract

PURPOSE:To improve the convergence characteristics to a target vehicle speed by setting the initializing time in such a way that at the input time of the resume signal the specified time is added to an initializing time which is determined on the basis of the actual vehicle speed, that is, varied according to the level of the actual vehicle 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 resume signal is received, the initializing time is set in such a way that the specified time is added to an initializing time which is determined on the basis of the actual vehicle speed, that is, varied with the level of the actual 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 for returning 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 significantly lower than the target vehicle speed, overshoot 1 or undershoot will occur, so the convergence until returning to the target vehicle speed will be lower than the target vehicle speed. This is worse than when the speed is close to the vehicle speed, and the convergence will vary depending on the actual vehicle speed at the time of resume start, which may cause an uncomfortable feeling during operation.

<Problems to be Solved by the Invention> In view of the problems of the prior art, the main purpose of the present invention is to return the actual vehicle speed to the target vehicle speed before cancellation by inputting a resume signal after canceling constant speed driving. sometimes,
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 sense of discomfort caused by a difference in convergence rather than a difference in actual vehicle speed at the start of resume.

[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 an actual vehicle speed at a 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,
A constant speed vehicle in which the control means stores a target vehicle speed by inputting a set signal, and controls the constant speed traveling at the target vehicle speed before cancellation by inputting a resume signal after canceling constant speed traveling. In the control system for a traveling device, when the control means inputs the resume signal, 1. Add a predetermined time to the initialization time based on the actual vehicle speed, which changes in length depending on the height of the actual vehicle speed, and apply an acceleration control signal to the actuator at 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:

<Operation> In this way, if the actual vehicle speed at the start of resume is considerably lower than the target vehicle speed, the initialization time at the start of resume can be made longer than the initialization time based on the actual vehicle speed, which is relatively Acceleration performance can be improved by a large initial acceleration, and since the initialization time at the start of resume does not exceed the initialization time based on the target vehicle speed, the initialization process can be performed without increasing the throttle valve opening too much. Therefore, the vehicle speed can be smoothly converged 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 unit 1 serving 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 battery (not shown) 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 which is operated 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. The magnetic clutch 11 is configured to include a magnetic clutch 11. 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, which are parallel to each other, are connected to the power supply terminal ■, and the emitters of transistors Q3 and Q4, whose collectors are respectively connected to the collectors of transistors Q1 and Q2, are connected to the control section. It is grounded via 1. These transistors Ql,
A limit switch 14.1 with a normally closed contact is connected between each collector of Q3 and each collector of transistors Q2 and Q4.
Both terminals of the motor 7 are connected through the terminals 5 and 5, respectively. Therefore, by supplying an ON signal from the control unit 1 to the transistors Q1 and Q4, 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, at the start of constant speed driving, by initializing and driving the operating 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. The initialization process at the time of setting is to initially drive the motor 7 with an initialization time based on the actual vehicle speed, which changes in length or shortness in proportion to the actual vehicle speed, as shown by the dashed line in FIG. The opening amount of the throttle valve 8 is ensured to match the actual vehicle speed at the time of setting.

Next, when a brake operation is performed to decelerate while driving at a constant speed, the constant speed driving state is canceled, but 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 be returned to the erratic running state again. At this time, an initialization signal is supplied from the control section to the motor 7 in the same manner as when setting.

During this initialization time at the start of resume, the target vehicle speed (Vs) is set by brake operation as described above.
For example, when the actual vehicle speed (Vl) in the figure becomes lower, the initialization time (T1) based on the actual vehicle speed
The time (T1+Tα) is the sum of the additional value (Tα).

This additional value (Tα) is set such that the initialization time is such that the throttle valve 8 is opened extra so that the vehicle speed becomes the actual vehicle speed at the time of resume start plus, for example, 1 to 2 km/h. It may be sufficient to add to the amount.

Therefore, the initialization time (T
s), the opening degree of the throttle valve 8 becomes too large relative to the actual vehicle speed (■1), resulting in a large initial acceleration and a tendency to overshoot, or when the initialization is based on the actual vehicle speed. It is possible to eliminate the feeling of undershoot caused by a small initial acceleration due to the opening degree of the throttle valve 8 that is too small relative to the target vehicle speed (Vs), as in the case where time (T1) is used.

Furthermore, in this embodiment, when the initialization time at the start of resume, which is obtained by adding a predetermined value (Tα) to the initialization time based on the actual vehicle speed, exceeds the initialization time (Ts) 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) based on the target vehicle speed. Therefore, the throttle valve 8 corresponding to the target vehicle speed (Vs)
Since the opening amount does not open too much, for example, when the actual vehicle speed increases due to a long downhill run and the cancel processing is performed in the same way as above, the resume switch 5 is turned on to return to constant speed running again. , the vehicle speed can be smoothly converged to the target vehicle speed with appropriate engine braking.

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 O. By doing this, when the actual vehicle speed (■2) at the start of resume is equal to or higher than the vehicle speed at the switching point (Vp), the throttle valve 8 is initially in the fully closed state and strong engine braking is applied. can be used to quickly decelerate.

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.

[Effects of the Invention] As described above, according to the present invention, since a predetermined time is added to the initialization time based on the actual vehicle speed, which changes in length depending on the actual vehicle speed, and the initialization time is set as the initialization time when the resume signal is input, the resume If the actual vehicle speed at the start is significantly lower than the target vehicle speed, it is possible to quickly accelerate with a large initial acceleration due to the long initialization time, and the initialization time does not exceed the initialization time based on the target vehicle speed. Therefore, the initial acceleration can be smoothly converged to the target vehicle speed and the vehicle can run at a constant speed without increasing the initial acceleration too much, which is extremely effective.

[Brief explanation of the drawing]

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 14.15...
·Limit switch

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, when inputting the resume signal, adds a predetermined time to an initialization time based on the actual vehicle speed, which varies in length depending on the height of the actual vehicle speed, and sets 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 with an initialization time that does not exceed an initialization time based on .