JPH0427626A - Constant speed control device - Google Patents

Abstract

PURPOSE:To enhance the feeling of running in the range of a highest limit vehicle speed during operation of an accelerator by restraining the upper limit of a desired vehicle speed upon acceleration up to a highest limit vehicle speed, and then by performing the control of constant speed running with an actual speed as a new desired vehicle speed which has been attained at the time of completion of the accelerator operation. CONSTITUTION:Each of control devices 1,6 is composed in general of a microcomputer. Of these control devices 1, 6, the speed change control device 6 computes a suitable position from the relationship between a vehicle speed and a throttle opening degree through a data map so as to control a transmission. This speed change control is independent from control of constant speed running, but an OD cut and a control right for recovery are sometimes given to a constant speed running control device 1 in dependence upon a system to be used. That is, the constant speed running control device 6 stores an actual vehicle speed in memory when a set switch 4 is manipulated, and thereafter, the constant speed running control is started. During this control, a signal is delivered to an actuator 2, a throttle 3 is regulated so as to hold the actual vehicle speed at the desired vehicle speed. Meanwhile, when an accelerator switch is manipulated during constant running speed, the desired vehicle speed is increased to increase the actual vehicle speed.

Description

[Detailed Description of the Invention] [Summary] This invention relates to a constant speed cruise control device that causes a vehicle to travel at a target vehicle speed, with the aim of improving the driving sensation when operating the accelerator to increase the target vehicle speed, and which operates at a constant speed below a predetermined high speed limit vehicle speed. In a constant speed cruise control device that performs cruise control and increases the actual vehicle speed while increasing the target vehicle speed when the accelerator operation is performed, the upper limit of the increase in the target vehicle speed is suppressed to the high speed limit vehicle speed, and the actual vehicle speed at the end of the accelerator operation is The vehicle is configured to perform constant speed driving control using the new target vehicle speed as the new target vehicle speed.

[Industrial application field]

The present invention relates to a constant speed driving control device for driving a vehicle at a target vehicle speed.

The control device that automatically drives the vehicle and drives the vehicle at a constant speed at a target speed not only eliminates the need for the driver to operate the accelerator pedal for long periods of time, but also allows the driver to operate the accelerator to shift to a faster, constant speed drive with just a switch. It's convenient.

(Prior art) A conventional constant speed traveling device has an input section such as a set SW (switch) and accelerator control, a processing section that converts the difference between the target vehicle speed and the actual vehicle speed into an actuator control amount, and a processing section that actually controls the throttle opening. When the set switch is operated during non-control, the actual vehicle speed at that time is stored in the memory, and from now on, constant speed driving control is started using that as the target vehicle speed.If the accelerator switch is operated during this control, the actual vehicle speed at that time is stored in the memory. , the processing unit gradually increases the target vehicle speed by calculation.During constant speed driving control, the actual vehicle speed is always controlled to approach the target vehicle speed, so when the target vehicle speed is increased by accelerator control, the actual vehicle speed is increased to follow the target vehicle speed. Speed also increases.

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

[Problem to be solved by the invention]

Generally, constant speed driving control sets a high speed limit vehicle speed, and prohibits constant speed driving control above this limit. Therefore, as shown in FIG. 4, when the actual vehicle speed reaches the high speed limit vehicle speed due to accelerator operation, the target vehicle speed is prohibited from increasing to prevent the actual vehicle speed from increasing any further.

However, the method shown in Figure 4 does not set an 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 lowered to the high-speed limit vehicle speed, and then when the actual vehicle speed falls below the high-speed limit vehicle speed, the target vehicle speed is increased again. Since this control is performed repeatedly, fluctuations occur in the actual vehicle speed.

In addition, in vehicles that cut the OD (overdrive) when operating the accelerator, even after achieving the goal of increasing the actual vehicle speed, the vehicle continues to drive with a large OD cut state of driving force, resulting in a worsening of the driving sensation as well as the above-mentioned undulations. become the cause.

The present invention aims to improve these points and improve the driving sensation near the high speed limit when operating the accelerator.

[Means for Solving the Problems] Fig. 1 is a block diagram of the present invention, in which 1 is a constant speed traveling control device, 2
is the actuator, 3 is the throttle, 4 is the set SW,
5 is an accelerator SW, and 6 is a speed change control device.

[Effect]

The control device 1.6 is generally constructed using a microcomputer, and among these, the transmission control system W6 controls a transmission (not shown) by calculating an appropriate shift position based on the relationship between the vehicle speed and the throttle opening.

This speed change control is independent of constant speed cruise control, but depending on the system, the constant speed cruise control device 1 may be given control over OD cut (off) and return (on). It depends on the system whether this control right is granted unconditionally or only when a permission signal is issued from the transmission control device 6.

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

On the other hand, when the accelerator switch is operated while the vehicle is traveling at a constant speed, the target vehicle speed is increased and the actual vehicle speed is increased. FIG. 2 is an operational 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,
To prevent the occurrence of fluctuations in vehicle speed as shown in FIG. 4 by preventing the actual vehicle speed from exceeding a high speed limit vehicle speed.

Also, if the OD is cut (off) at the start of accelerator operation, the actual vehicle speed will be a constant value (for example -3
Km/h), return to OD (turn on),
Avoid running with unnecessary driving force.

By doing so, it is possible to smooth the change in vehicle speed when operating the accelerator near the high speed limit vehicle speed, and improve the driving sensation.

Note that whether or not to perform an OD cut when operating the accelerator may be determined depending on the actual vehicle speed. FIG. 2 shows an example of a method in which OD cut is performed when the actual vehicle speed at the start of accelerator operation is lower than (high-speed limit vehicle speed - 8 km/h), and when it is higher, the target vehicle speed is increased without OD cut. If the above-mentioned permission signal is added to this, the OD cut will be 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, and shows the processing of the constant speed cruise control device 1.

The figure (a) relates to OD control, in which the current mode is determined in step S1, and if it is the accelerator mode, it is determined in step S2 whether or not OD is on. If OD is on, the actual vehicle speed (VN) is converted to the OD cut vehicle speed (HS) in step S3.
However, H3L is the high speed limit vehicle speed), and if VN<H3L-8 m/h, OD cut is performed in step S4.

However, if VN is higher than HSL -8Km/h, O
Leave it uncut.

On the other hand, if OD cut is determined in step S2, VN is set to OD return vehicle speed ()ISL-:ll+*/ in step S5.
Comparing with h), if VN is low, OD cut is left as is, but when VN≧H3L-3 (m/h), OD return is performed in step S6.

After that, wait for the accelerator switch to turn off, and proceed to step S1.
If it is determined that the accelerator mode is no longer in the accelerator mode, a transition is made to the set mode in step S7, and in step S8, the actual vehicle speed at that time is stored in the memory and used as the target vehicle speed (memory vehicle speed) from now on.

(b) is an accelerator control for increasing the target vehicle speed VD, and its first step Sll is a process for increasing the target vehicle speed VD by a predetermined amount α every time. Continued Sten 7'S 12
t'VD@H3L, and if VD≧H3L, then in step S13, VD is limited to )ISL.

(Effects of the Invention) As described above, according to the present invention, even if the accelerator operation to increase the target vehicle speed is performed near the high-speed limit vehicle speed during constant speed driving control, no fluctuation in vehicle speed occurs, and unnecessary OD
Since it does not cut continuously, the vehicle speed changes smoothly, which has the advantage of improving the driving sensation.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram of the present invention, FIG. 2 is an operational waveform diagram of the present invention, FIG. 3 is a flowchart showing an embodiment of the present invention, and FIG. 4 is an operational waveform diagram of conventional accelerator control. In the figure, 1 is a constant speed traveling control device, 2 is an actuator, and 3
is the throttle, 4 is the set SW, 5 is the accelerator SW, 6
is a speed change control device. Applicant: Minoru Aoyagi, Patent Attorney, Fujitsu Ten Ltd.

Claims (1)

[Claims] 1. A constant speed driving control device that performs constant speed driving control below a predetermined high speed limit vehicle speed and increases the actual vehicle speed while increasing the target vehicle speed when the accelerator is operated, comprising: A constant speed cruise control device, characterized in that a constant speed cruise control is performed by suppressing an upper limit to the high speed limit vehicle speed and using the actual vehicle speed at the end of the accelerator operation as a new target vehicle speed. 2. The constant speed cruise control device according to claim 1, wherein after overdrive is cut at the start of accelerator operation, control is performed to return to overdrive when the actual vehicle speed approaches a predetermined value with respect to the high speed limit vehicle speed. .