JPH02136338A - Fixed speed running control device - Google Patents

Abstract

PURPOSE:To dispense with a potentiometer for presetting the car speed and an A/D converter, simplify a structure, and reduce the cost by using the running car speed obtained from a car speed sensor as the preset value of the target car speed for fixed-speed running. CONSTITUTION:An actuator 3 is controlled by a microcomputer 2 based on the difference between the target car speed stored in a set memory and the running car speed detected by a car speed sensor 1. The throttle opening is automatically adjusted, and fixed-speed running is controlled to keep the running car speed at the target car speed. In this case, when a memory switch M is pushed, the running car speed at that time is stored in a backup preset memory as the preset car speed. When a preset switch P is pushed, the preset car speed read out from the preset memory is written in the set memory, and the control is started. The preset function of the target car speed is provided by only adding the switch.

Description

[Detailed Description of the Invention] [Summary] In a constant speed driving control device that can preset a target vehicle speed for constant speed driving, the preset value can be set by using the traveling vehicle speed obtained from the vehicle speed sensor as the preset value. To eliminate the need to use a potentiometer or an A/D converter for vehicle speed setting.

[Industrial application field]

The present invention relates to a constant speed cruise control device having a function of presetting a target vehicle speed.

[Conventional technology]

A constant speed cruise control device (auto drive) that automatically adjusts the throttle opening to keep the vehicle speed close to the target vehicle speed uses the vehicle speed obtained from the vehicle speed sensor 1 and the memory in the microcomputer 2 as shown in FIG. The actuator 3 for adjusting the throttle opening is driven so as to reduce the difference between the vehicle speed and the stored target vehicle speed.

Generally, the target vehicle speed is set by storing the value in memory by operating a switch when the actual vehicle speed reaches the desired value, but as shown in Figure 5, potentiometer 4 is used to set the target vehicle speed. A method of setting the value has also been proposed.

According to this method, when the preset switch P is pressed, the microcomputer 2 reads the value set by the potentiometer 4, sets it as the target vehicle speed, and starts control.

[Problems to be Solved by the Invention] However, the method shown in FIG. 5 requires a potentiometer 4 for setting the preset vehicle speed and an A/D conversion circuit 5 for converting the value into a digital value, so the configuration is complicated. It has the disadvantage of high cost.

The present invention aims to simplify the configuration and reduce costs by allowing the preset vehicle speed to be set based on the traveling vehicle speed.

[Means to solve the problem]

FIG. 1 is a diagram showing the first principle of the present invention, in which 1 is a vehicle speed sensor, 2
3 is an actuator for adjusting the throttle opening, P is a preset switch, and M is a memory switch.

FIG. 2 is a second principle diagram of the present invention, which differs from FIG. 1 in that the memory switch M is omitted. The set switch S and the cancel switch C are existing ones that instruct the start and end of constant speed driving control.

[Effect]

FIG. 1 shows a system in which when a memory switch M is pressed, the current traveling vehicle speed is read from a vehicle speed sensor 1 and stored in a memory in a computer 2 as a preset vehicle speed. This memory is a backed-up memory separate from the set memory that stores the target vehicle speed under control, and is hereinafter referred to as preset memory.

In FIG. 1, when the preset switch P is pressed, the preset vehicle speed stored in the preset memory is written into the set memory, and from then on, control is started using that as the target vehicle speed.

FIG. 2 shows a system in which when a preset switch P is pressed during control, the traveling vehicle speed at that time is stored in a preset memory as a preset vehicle speed. In this system, when the same preset switch P is pressed while the vehicle is not being controlled, the preset vehicle speed stored in the preset memory is written to the set memory, and thereafter control is started using that as the target vehicle speed.

Normal constant speed driving control is started by pressing the set switch S and writing the current traveling vehicle speed into the set memory. This control is performed by one of several types of cancel switch C.
When turned on, it is canceled and becomes uncontrolled. The system shown in FIG. 2 uses the preset memory P differently in the controlled and non-controlled states, and omits the memory switch M shown in FIG. 1.

〔Example〕

FIG. 3 is a flowchart of a first embodiment of the present invention that implements the method shown in FIG. Step SlO is a process of reading the current traveling vehicle speed from the vehicle speed sensor. Step 3
11 is the ON10 FF judgment of memory switch M,
If this is ON, the current traveling vehicle speed is stored in the preset memory as a preset vehicle speed in step S12. Step S13 is to turn the preset switch P ON10.
If FF is ON, the preset vehicle speed is changed to the target vehicle speed in step S14 and transferred from the preset memory to the set memory), and then in step 315 a control flag is set to instruct the start of control.

Step 316 is a determination of the control flag, and if it is set, constant speed driving control is performed in step S17. The next step 318 is a process that includes control of the accelerator mode, resume mode, overdrive cut for the transmission, etc. After this process, step S
Repeat processing from IO.

The method of this example can be expanded to include a plurality of preset switches P, each with a preset memory, so that a plurality of preset vehicle speeds can be set. In that case,
The following operating methods are possible.

■A method of presetting the current traveling vehicle speed in the corresponding preset memory by pressing any precent switch Pi (where i = l-n) while the memory switch M is being pressed.

- A method of pressing any preset switch Pi within a predetermined time (about several seconds) after pressing the memory switch M to preset the current vehicle speed in the corresponding preset memory.

When multiple preset vehicle speeds are stored in this way, the preset vehicle speed can be read from the corresponding preset memory by using only the preset switch Pi alone, but in this case, the preset vehicle speed is displayed on the display once, It is preferable to start the control when the same preset switch Pi is pressed again for confirmation, so that constant speed driving at an undesired target vehicle speed can be avoided.

FIG. 4 is a flowchart of a second embodiment of the present invention that implements the method of FIG. Step S20 is the same detection of the traveling vehicle speed as in FIG. 3, followed by steps 521-325 (
Part A) is the processing of the cancel switch C and the set switch S. If it is determined in step 321 that the C switch is ON, the control flag is reset in step 322, and if it is determined that the S switch is ON in step S23, the traveling vehicle speed is stored in the set memory as a target vehicle speed in step S24, and the control is controlled in step 325. Set flag. Part A from steps 321 to 325 is also included between step 310 and Sll in FIG. 3, but is omitted in this figure.

Step S30 in FIG. 4 is a check of the control flag, and if this flag is set, constant speed running control is performed in step S31. Furthermore, if the P switch is pressed during this control (step 532), the traveling vehicle speed is stored in the preset memory as a preset vehicle speed in step S33.

On the other hand, when it is determined in step S30 that the control flag is reset, the vehicle is not being controlled, so the P switch has a function of reading the preset vehicle speed. Step S34 is this P
If this is ON according to the judgment of the switch, step 335
The preset vehicle speed is read from the preset memory and written to the set memory as the target vehicle speed. Then, a control flag is set in step S36, and other processing is performed in step S37.

In step S33, the value stored in the preset memory as the preset vehicle speed is the current traveling vehicle speed obtained from the vehicle speed sensor, but this may also be the target vehicle speed stored in the cent memory. Doing this is useful, for example, when you are driving at a target speed of 1100 Kva/h and approach a boarding road, and you want to preset 1100 Kva/h when the actual speed of the vehicle is only 90 Kva/h. be. In addition, this is not necessarily the case; the target vehicle speed in the set memory will disappear when the main switch is turned off, so it can also be used to retain the previous target vehicle speed in the backed up preset memory. .

There is a resume mode that allows the control to return from a non-control state to control using the target vehicle speed in the set memory, but this is only valid while the main switch is on, and only the most recent target vehicle speed can be used. On the other hand, if the target vehicle speed at the time it becomes the preset memory is stored, even if the target vehicle speed in the set memory is changed several times thereafter, the vehicle speed can be returned to the vehicle speed in the preset memory.

〔Effect of the invention〕

As described above, according to the present invention, a target vehicle speed presetting function can be provided by simply adding a switch to an existing constant speed cruise control device.

[Brief explanation of the drawing]

FIG. 1 is a first principle diagram of the present invention, FIG. 2 is a second principle diagram of the present invention, FIG. 3 is a flowchart of the first embodiment of the present invention, and FIG. 4 is a second embodiment of the present invention. An example flowchart, FIG. 5, is a configuration diagram of a conventional constant speed cruise control device. Applicant Fujitsu Ten Ltd.

Claims (2)

[Claims] 1. In a constant speed cruise control device equipped with a microcomputer (2) that controls an actuator (3) according to the difference between a target vehicle speed stored in a set memory and a traveling vehicle speed obtained from a vehicle speed sensor (1), a memory switch ( Press M) to store the current traveling vehicle speed as a preset vehicle speed in the backed up preset memory, and press the preset switch (P) to write the preset vehicle speed read from the preset memory into the set memory and start control. A constant speed traveling control device characterized in that: 2. In a constant speed driving control device equipped with a microcomputer (2) that controls an actuator (3) according to the difference between a target vehicle speed stored in a set memory and a traveling vehicle speed obtained from a vehicle speed sensor (1), constant speed driving is performed. When the preset switch (P) is pressed during control, the current traveling vehicle speed or the target vehicle speed in the set memory is stored as the preset vehicle speed in the backed up preset memory, and the preset switch (P) is pressed during non-control. 1. A constant speed cruise control device, characterized in that when is pressed, a preset vehicle speed read from the preset memory is written into the set memory and control is started.