JP3051934B2 - Constant speed traveling control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Summary] The present invention relates to a constant-speed cruise control device for driving a vehicle at a target vehicle speed, with the aim of improving the driving sensation at the time of accelerator operation for increasing the target vehicle speed. Performs constant speed traveling control so that the target vehicle speed matches the target vehicle speed, and increases the actual vehicle speed while increasing the target vehicle speed when an accelerator operation is performed by an accelerator switch. Limit the vehicle speed to the limit vehicle speed, perform constant speed running with the actual vehicle speed at the end of the accelerator operation as the new target vehicle speed, and cut off the overdrive at the start of the accelerator operation, and when the actual vehicle speed approaches the high speed limit vehicle speed to a predetermined value, It is configured to control to return to the drive.

[Industrial Application Field] The present invention relates to a constant-speed traveling control device that causes a vehicle to travel at a target vehicle speed.

The control device that automatically drives the vehicle to run at a constant speed at the target vehicle speed not only eliminates the need for the driver to operate the accelerator pedal for a long time, but also allows the accelerator operation to shift to higher speed running at a constant speed using only switches. There is convenience.

[Conventional technology]

The conventional constant-speed traveling device includes an input unit such as a set switch (switch) and an accelerator switch, a processing unit that converts a difference between a target vehicle speed and an actual vehicle speed into an actuator control amount, and an actuator that actually changes a throttle opening. When the set SW is operated during non-control, the actual vehicle speed at that time is stored in the memory, and thereafter, the constant speed traveling control is started with the target vehicle speed. When the accelerator SW is operated during this control, the processing unit gradually increases the target vehicle speed by calculation. During the constant-speed running control, control is performed so that the actual vehicle speed approaches the target vehicle speed. Therefore, when the target vehicle speed is increased by the accelerator control, the actual vehicle speed also increases so as to follow the target vehicle speed.

FIG. 4 shows operation waveforms at the time of the conventional accelerator control, and shows that when the accelerator SW is turned on, the target vehicle speed first increases, and the actual vehicle speed increases so as to follow the target vehicle speed. This accelerator operation ends when the accelerator SW is turned off, and the actual vehicle speed at that time is stored in the memory as a new target vehicle speed.

[Problems to be solved by the invention]

In general, the constant-speed running control sets a high-speed limit vehicle speed, and prohibits the constant-speed running control at a speed higher than the limit speed. Therefore, when the actual vehicle speed reaches the high-speed limit vehicle speed by the accelerator operation as shown in FIG. 4, the increase in the target vehicle speed is prohibited so as not to further increase the actual vehicle speed.

However, in the method of FIG. 4, there is no upper limit on the target vehicle speed, and when the actual vehicle speed reaches the high speed limit vehicle speed, the target vehicle speed is reduced to the high speed limit vehicle speed, and thereafter, when the actual vehicle speed falls below the high speed limit vehicle speed, the target vehicle speed is increased again. In order to control the vehicle speed, the actual vehicle speed swells due to this repetition.

In addition, a vehicle that cuts OD (overdrive) when the accelerator is operated will run in the OD cut state where the driving force is large even after achieving the purpose of increasing the actual vehicle speed. Cause.

The present invention is intended to improve these points and improve the running feeling near the high speed limit vehicle speed when the accelerator is operated.

[Means for solving the problem]

FIG. 1 is a block diagram of the present invention.
2 is an actuator, 3 is a throttle, 4 is a set SW,
5 is an accelerator switch, and 6 is a shift control device.

[Action]

The control devices 1 and 6 are generally constituted by using a microcomputer. Among them, the shift control device 6 controls a transmission (not shown) by calculating a map of an appropriate shift position from the relationship between the vehicle speed and the throttle opening. This shift control is independent of the cruise control, but depending on the system, the right to control OD cut (off) and return (on) is controlled by the cruise control device 1.
May be given to. Grant this control unconditionally or
Whether or not the permission signal is output from the transmission control device 6 depends on the system.

When the set SW4 is operated, the constant speed traveling control device 6 stores the actual vehicle speed at that time in a memory, and thereafter starts the constant speed traveling control using the actual vehicle speed as a target vehicle speed. During this control, a signal is sent to the actuator 2 to adjust the throttle 3 to keep the actual vehicle speed at the target vehicle speed.

On the other hand, when the accelerator SW is operated during the constant speed traveling, the target vehicle speed is increased to increase the actual vehicle speed. FIG. 2 is an operation waveform diagram at this time.

In the present invention, the upper limit of the target vehicle speed is suppressed to the high speed limit vehicle speed, and the actual vehicle speed does not exceed the high speed limit vehicle speed, thereby preventing the swelling of the vehicle speed as shown in FIG.

If the OD is cut (off) at the start of the accelerator operation, the actual vehicle speed becomes a fixed value (for example,-
When the vehicle reaches 3km / h), return to OD (ON) and avoid running with unnecessary driving force.

This makes it possible to smoothly change the vehicle speed when the accelerator is operated in the vicinity of the high speed limit vehicle speed, thereby improving the driving feeling.

It should be noted that whether or not to perform the OD cut when the accelerator is operated may be determined according to the actual vehicle speed. FIG. 2 shows an example of a system in which the OD cut is performed when the actual vehicle speed at the start of the accelerator operation is lower than the (high speed limit vehicle speed −8 km / h), and when the actual vehicle speed is higher, the target vehicle speed is increased without performing the OD cut. When the above-mentioned permission signal is added to this, the OD cut is performed only when the actual vehicle speed is low and the permission signal is ON.

〔Example〕

FIG. 3 is a flowchart showing one embodiment of the present invention.
2 shows a process of the constant-speed traveling control device 1. FIG.
This relates to the OD control. In step S1, the current mode is determined. If the mode is the accelerator mode, it is determined in step S2 whether the OD is on. If the OD is on, the actual vehicle speed (V
N) is compared with the OD cut vehicle speed (HSL-8km / h).
Is the high speed limit vehicle speed), and if VN <HSL−8 km / h, OD cut is performed in step S4. However, if VN is higher than HSL-8km / h, do not cut OD.

On the other hand, if the OD cut is determined in step S2, step
In step S5, VN is compared with the OD return vehicle speed (HSL−3 km / h). If VN is low, the OD cut is kept, but if VN ≧ HSL−3 km / h, OD return is performed in step S6.

Thereafter, wait for the accelerator SW to be turned off, and if it is determined in step S1 that the accelerator mode has been stopped, step S7
To shift to the set mode. In step S8, the actual vehicle speed at that time is stored in the memory, and is set as a target vehicle speed (stored vehicle speed) thereafter.

(B) is an accelerator control for increasing the target vehicle speed VD. The first step S11 is a process for increasing the target vehicle speed VD by a predetermined amount α each time. In the following step S12, VD is compared with HSL, and if VD ≧ HSL, VD is limited to HSL in step S13.

〔The invention's effect〕

As described above, according to the present invention, even when the accelerator operation for increasing the target vehicle speed during the constant speed traveling control is performed near the high speed limit vehicle speed, the swell of the vehicle speed does not occur, and the OD needlessly increases.
Since cutting is not continued, there is an advantage that the change in vehicle speed is smooth and the driving feeling is improved.

[Brief description of the drawings]

1 is a configuration diagram of the present invention, FIG. 2 is an operation waveform diagram of the present invention, FIG. 3 is a flowchart showing one embodiment of the present invention, and FIG. 4 is an operation waveform diagram of a conventional accelerator control. In the figure, 1 is a constant speed traveling control device, 2 is an actuator, 3
Is a throttle, 4 is a set switch, 5 is an accelerator switch, and 6 is a shift control device.

Claims (1)

(57) [Claims] 1. A constant speed control system that performs a constant speed running control so that an actual vehicle speed matches a target vehicle speed below a predetermined high speed limit vehicle speed, and increases the actual vehicle speed while increasing the target vehicle speed when an accelerator operation is performed by an accelerator switch. In the travel control device, the upper limit of the target vehicle speed increase is suppressed to the high speed limit vehicle speed, the actual vehicle speed at the end of the accelerator operation is set as a new target vehicle speed, and the constant speed travel is performed. A constant-speed cruise control device that controls the vehicle to return to overdrive when the speed approaches a predetermined value with respect to a high-speed limit vehicle speed.