JPS5922265Y2 - Vehicle maximum speed limiter - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device for automatically limiting the maximum speed of a vehicle, particularly an automobile, equipped with an internal combustion engine as a prime mover.

Conventionally, in devices that limit the maximum speed of a vehicle, the second
As shown in the figure, the signal from the speedometer switch (1C) that outputs when the vehicle exceeds the set speed (
The fuel cut device 2 of the Vma phantom was manually operated to limit the maximum speed by cutting off the fuel supply when the vehicle speed exceeded a set speed.

However, if the speedometer switch 1C leaves the output signal Vmax unchanged due to some abnormality, the fuel is cut off, making it difficult to drive normally.

The present invention solves the above-mentioned problems, and will be explained based on FIG. 1. 1a in FIG. A signal Ne representing the rotation speed is output.

2C is a converter into which the signal Ne is input, and this converter consists of a one-shot multivibrator, a smoothing circuit, and the like.

2a is a rotation speed comparator provided after the converter 2C, and this comparator inputs the signal from the converter, and
Compared with a certain setting value No. (for example, 2200 rpm),
When the rotation speed is greater than or equal to this set value, a signal Nc is output.

2b is an AND circuit provided after the rotation speed comparator 2a, and this AND circuit inputs the output of the wired OR 4 manually.

psw is a throttle close switch, which outputs a signal full when the throttle valve opens more than the set opening or approaches full opening.

Note that the above reference numeral 1b is a throttle close switch, which outputs a signal idl when the opening of the throttle valve becomes less than a set opening, that is, during deceleration.

The throttle close switch psw and the speedometer switch 1C are provided in series and constitute an AND circuit 5.

In the present invention as described above, the engine is set at the set rotation speed No.
With the above, when the throttle valve is closed, that is, when decelerating, and when the engine is at or above the set rotation speed, the throttle valve is fully open, and the vehicle exceeds the set speed,
Fuel is cut.

In other words, the speedometer switch 1C, which is the maximum speed detection device, and the signal (f
The maximum speed detection device This has the advantage that even if an abnormality occurs in the speedometer switch 1C and the switch is left on and off, there will be no problem during normal city driving.

In other words, the maximum speed limiting device prevents fuel from being cut off due to malfunction of the speedometer switch 1C, thereby preventing the vehicle from becoming inoperable.

[Brief explanation of drawings]

Figure 1 is a block wiring diagram showing an embodiment of the present invention;
The figure is a block wiring diagram that does not show the main parts of a conventional example. psw: Throttle open switch, 1C double speed meter switch, 5: AND circuit.

Claims (1)

[Scope of utility model registration request] This device limits the maximum speed of the vehicle through a fuel cut device, and includes a speedometer switch that issues a signal when the vehicle exceeds a set speed, and a signal when the throttle valve reaches the set opening or is close to being fully opened. 1. A maximum speed limiting device for a vehicle, characterized in that a throttle closing switch is provided, and a fuel cut to a prime mover is controlled by a logical product of these two signals.