JPS61277843A - Vehicle speed limiter - Google Patents

Abstract

PURPOSE:To prevent shock under vehicle speed limiting operation by providing means for performing open/close control of throttle valve and means for commanding suppression of opening of throttle valve. CONSTITUTION:Acceleration operating amount detecting means (a) will detect the operating amount of accelerator operating chip. Throttle control means (b) will perform open/close control of throttle valve with correspondence to the detected operating amount of accelerator operating chip. Vehicle speed detecting means (c) will detect the vehicle speed. Upon arriving of the detected vehicle speed to preset upper limit, throttle opening suppression control means (d) will command the throttle control means (b) to suppress the opening of throttle valve. Consequently, shock can be prevented completely under vehicle speed limiting operation.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of the Invention) The present invention relates to a vehicle speed limiting device for limiting vehicle speed.

(Background of the Invention) In conventional devices of this type, when the vehicle speed reaches a preset upper limit vehicle speed (for example, 1'80 km/h),
Fuel injection to the engine had been stopped.

However, in the conventional device, the engine speed suddenly decreases when fuel injection is stopped, which often causes a large shock, causing discomfort to the occupants and causing a loss of vehicle stability.

(Object of the invention) The present invention has been made in view of the above-mentioned conventional problems,
The purpose is to provide a vehicle speed limiting device that can prevent the occurrence of shocks that cause discomfort to passengers during vehicle speed limiting operations.

(Configuration of the Invention) In order to achieve the above object, an apparatus according to the present invention is configured as shown in FIG.

That is, in the figure, the operation amount of the accelerator operator is detected by the accelerator operation amount detection means a, and the throttle valve is controlled to open and close by the throttle control means in accordance with the detected operation amount.

(The midway point is detected by the 1st stage C of the oscillation speed detection T,
J series] Rigid 11; Upper limit 111 set for the first stroke of free speed
When J3 reaches the speed, a command to suppress the opening of the throttle valve t is given to the throttle control means from the throttle control section 1-7 and the 2nd stage d of the throttle valve 1-7.

(M2 Light of Example) Ill lower M surface [,-Prefecture T] A preferred embodiment of the apparatus according to the present invention is fabricated.

A whistle? Q L, -r3 T Amount of pedal 1n on the accelerator 1) Hepo pressure: 1day'+1? L7 has been detected, and the bracket 16 is supported by the bracket 16 at the front of the driver's seat, just like the 3rd M1 child. .

I, T? The cell pedal 10 is biased counterclockwise in FIG. 3 by the IJ spring 18 by the tongue 7. t3
1 meter 12 is accelerator pedal 7b 1
It is driven to n t, -, y. 'The detection signal of this blank η meter 12 is shown in Figure 2 L: Not shown Z) -1
[9-Throttle control circuit 14 is supplied to the microcomputer 22 via the TΔ/jT conversion circuit 20, and the microcomputer 22 obtains a motor control signal based on the detection signal.

The motor control signal is given to a motor driver 26 via the D/A conversion circuit 24, and the step motor 28 is driven and controlled by the motor driver 26 in accordance with the motor control signal.

The throttle valve 30 is roughly controlled by the step motor 28.
is opened and closed, and the detection signal of the potentiometer 32 driven by the step motor 28 is detected by the throttle valve 30.
The opening detection signal is supplied to the microcombiner 22 via the A/D conversion circuit 22.

As shown in FIG. 4, the step motor and potentiometer 32 are integrated, and the throttle valve 3
0 is biased in the closing direction by a return spring 36 via a lever 34.

Here, the vehicle speed is detected by the vehicle speed sensor 38,
The detection signal is supplied to the microcomputer 22.

FIG. 5 shows a flowchart of the control processing procedure performed by the microcomputer 22, and the operation of this embodiment will be explained below using this flowchart.

The process shown in FIG. 5 is repeated at predetermined intervals, and first, the amount of depression of the accelerator pedal 10 detected by the potentiometer 12 is read (step 100).

Then, the target throttle opening of the throttle valve 30 is calculated based on the accelerator pedal depression amount using a preset map characteristic (step 102), and then the actual throttle opening of the throttle valve 30 detected by the potentiometer 32 is calculated. is read (step 104).

Furthermore, the control deviation is calculated by subtracting the actual throttle opening from the target throttle opening (step 1).
06), the actual vehicle speed detected by the vehicle speed sensor 38 is compared with a preset upper limit vehicle speed (step 108).

At this time, if the actual vehicle speed has not reached the upper limit vehicle speed, the step motor 28 is driven in the direction in which the control deviation becomes O (step 110).

As described above, when the actual vehicle speed has not reached the upper limit vehicle speed, the throttle valve 30 is controlled to open or close in accordance with the depression operation of the accelerator pedal 10, and therefore the vehicle speed is controlled to increase or decrease in accordance with the depression operation.

Here, when the actual vehicle speed reaches or exceeds the upper limit vehicle speed and the control deviation is roughly positive (driving the throttle valve in the opening direction) (affirmative determination at step 108), the actual vehicle speed is increasing. It is determined whether or not there is (step 11
2).

At this time, if it is determined that the actual vehicle speed is not increasing, the step motor 28 is controlled to stop and the opening degree of the throttle valve 30 is maintained at the opening degree at that time, and if it is determined that the actual vehicle speed is not increasing. When the determination is made, the step motor 28 is driven in the direction in which the throttle valve 30 is closed (step 116).

In this way, since the opening degree of the throttle valve 30 is suppressed or reduced when the actual vehicle speed becomes equal to or higher than the upper limit vehicle speed, according to this embodiment, the engine speed does not suddenly decrease at that time. Therefore, it is possible to reliably prevent shocks from occurring due to vehicle speed limiting operations.

Furthermore, according to this embodiment, it is possible to arbitrarily change the calculation characteristics of the target throttle opening, so it is also possible to control the engine output in accordance with the characteristics of the vehicle and the driving conditions.

In general, the upper limit vehicle speed can also be lowered depending on the driving environment, for example in the rain or at night.

(Effects of the Invention) As described above, according to the present invention, the vehicle speed is limited by controlling the throttle valve opening, so it is possible to completely prevent shocks during the vehicle speed limiting operation.

Furthermore, since running stability is not lost, it is possible to limit the vehicle speed to an arbitrary speed.

[Brief explanation of drawings]

Fig. 1 is a diagram corresponding to claims, Fig. 2 is a block diagram showing a preferred embodiment of the device according to the present invention, Fig. 3 is an explanatory diagram of the configuration of the accelerator pedal mounting part, and Fig. 4 is a diagram of the step motor mounting part. The configuration explanatory diagram, FIG. 5, is a flowchart showing the control processing procedure of the microcomputer in FIG. 2. 10...Accelerator pedal 12...Potentiometer 14...Throttle control circuit 28...Step motor 30...Throttle valve 38...Vehicle speed sensor 1 Factor 5

Claims (1)

[Claims] (1) Accelerator operation amount detection means for detecting the operation amount of the accelerator operation element; throttle control means for controlling opening and closing of the throttle valve according to the detected operation amount of the accelerator operation element; vehicle speed detection means for detecting vehicle speed; A vehicle speed limiting device comprising: throttle opening suppression command means for instructing the throttle control means to suppress the opening of a throttle valve when the vehicle speed reaches a preset upper limit vehicle speed.