JPH0338432Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a vehicle speed limiter, and in particular, when modified to release the vehicle speed limit, the vehicle speed limit functions.
The present invention relates to a vehicle speed limiting device that can prevent vehicle speed restriction from being lifted.

[Prior Art] Conventionally, a device for limiting vehicle speed consists of a vehicle speed control section and an operating section whose operation is controlled by the vehicle speed control section. The vehicle speed control section detects vehicle speed using a speedometer cable or the like that constitutes a vehicle speed indicating mechanism. When the vehicle speed control section detects that the vehicle speed is less than the set vehicle speed, the operating section operates to allow an increase in engine output. When the vehicle speed exceeds the set vehicle speed, the vehicle speed control section operates the operating section to suppress the increase in engine output, thereby limiting the vehicle speed.

[Problem that the invention aims to solve] If the vehicle speed limiter is modified by removing or cutting the vehicle speed detection mechanism, circuitry, wiring, etc.
The vehicle speed control section can no longer detect the vehicle speed and sets the vehicle speed to 0.
I judge that. However, since the vehicle speed control section cannot distinguish between a zero vehicle speed state due to modification and a normal stopped state, the operating section is operated to allow an increase in engine output. This caused the inconvenience that the vehicle speed restriction was lifted.

[Purpose of the invention] Therefore, this invention realizes a vehicle speed limiting device that can function as a vehicle speed limiter and prevent the vehicle speed limit from being lifted by modifying the vehicle speed detecting mechanism, circuits, and wiring by removing or cutting them. The purpose is to

[Means for solving the problem] In order to achieve this object, this invention detects the neutral state of the internal combustion engine transmission, outputs the first electrical signal, and outputs the second electrical signal in the state other than the neutral state. A neutral state detection circuit outputs a signal, and detects disengagement of the clutch and outputs the first electric signal, outputs the first electric signal for a set time after the clutch is connected, and outputs the second electric signal after the set time elapses. a clutch disengagement detection circuit that outputs an electrical signal; detects vehicle speed; outputs the first electrical signal when the vehicle speed is within a set vehicle speed range; and outputs the second electrical signal when the vehicle speed is higher than the set vehicle speed and when the vehicle speed is not detected. a vehicle speed detection circuit that inputs electrical signals from each of the detection circuits, and outputs the first electrical signal when at least one of the first electrical signals is input, and also outputs the first electrical signal from each of the detection circuits; an OR gate that outputs a second electrical signal when a signal is input; and an OR gate that operates to allow an increase in engine output when the first electrical signal is input from this OR gate, and the second electrical signal is input. The present invention is characterized in that it is provided with an operating mechanism that operates to suppress an increase in engine output when the engine output is increased.

[Function] According to the configuration of this invention, even when the vehicle is stopped, it is possible to allow an increase in engine output with the transmission in a neutral state or with the clutch disengaged, and warm-up operation or racing can be performed. Further, by disengaging the clutch with the transmission in the neutral state, then bringing the transmission into the mesh state and connecting the clutch, the first electric signal is continuously input to the OR gate, and the vehicle can be started. After starting, the vehicle speed detection circuit detects the vehicle speed while the clutch disengagement detection circuit outputs the first electric signal for a set time, and outputs the first electric signal to the OR gate to permit running.

If the mechanism, circuit, or wiring for detecting vehicle speed is removed or cut, and the vehicle speed cannot be detected, the vehicle speed detection circuit outputs a second electrical signal. Furthermore, when the vehicle speed detection circuit is removed or the output wiring is cut, a second electrical signal is input to the OR gate at the start of travel. Therefore, when the engine is modified, the output of the OR gate becomes a second electrical signal, suppressing an increase in engine output.

[Example] Next, an example of this invention will be described in detail based on the drawings. In FIG. 1, 2 is a neutral state detection circuit for an internal combustion engine transmission (not shown), 4 is a clutch disengagement detection circuit, 6 is a vehicle speed detection circuit, 8 is an OR gate,
10 is an operating mechanism.

The neutral state detection circuit 2 includes a neutral switch 12 that detects the neutral state of the transmission and turns on, and a neutral display circuit 14 that is turned on when the neutral switch 12 is turned on. The neutral display circuit 14 includes an indicator lamp 16
and a bypass resistor 18 are provided in parallel,
An inverter 20 for inverting the polarity is provided on the output side. The neutral switch 12 is further connected to the output side of the neutral display circuit 14. Further, the input side is connected to a power source 24 via a main switch 22. When the neutral switch 12 is turned on, the neutral state detection circuit 2 transmits a high-level signal, which is a first electrical signal, to the neutral switch 12 by the inverter 20.
When it is turned off, the inverter 20 outputs a low-level signal, which is a second electric signal, to the OR gate 8, which will be described later.

The clutch disengagement detection circuit 4 detects disengagement of the clutch (not shown) and turns on the clutch switch 2.
6, and a delay circuit 28 which becomes conductive when the clutch switch 26 is turned on. The input side of the clutch switch 26 is connected to the power supply 24. A delay circuit 28, which becomes conductive when the clutch switch 26 is turned on, connects its output side to the OR gate 8. The clutch disengagement detection circuit 4 outputs a high-level signal as a first electrical signal when the clutch switch 26 is turned on, and also outputs this signal for a set time t after the clutch switch 26 is turned off by the delay circuit 28. When a set time t has elapsed since the clutch switch 26 was turned off, a low-level signal as a second electrical signal is output.

The vehicle speed detection circuit 6 detects vehicle speed using well-known means. For example, the vehicle speed is detected by the rotation of a speedometer cable or the rotation of a speed indicator that constitute a vehicle speed indicating mechanism. When the detected vehicle speed is within the set vehicle speed range, a high-level signal, which is a first electric signal, is output to the OR gate 8. When the vehicle speed is higher than or equal to the set vehicle speed, a low-level signal, which is a second electrical signal, is output to the OR gate 8. Also, when the vehicle speed is not detected,
In other words, when the vehicle speed is detected as 0 due to stopping the vehicle or removing the speedometer cable,
A low level signal, which is a second electric signal, is output to the OR gate 8.

The OR gate 8 includes the neutral state detection circuit 2,
Signals are input from the clutch disengagement detection circuit 4 and the vehicle speed detection circuit 6. When at least one high-level signal, which is the first electric signal, is input to the OR gate 8, it outputs a high-level signal even if other signals are at low levels. Furthermore, when the inputs from each of the detection circuits 2, 4, and 6 are all low-level signals that are second electrical signals, a low-level signal is output.

The operating mechanism 10, which is activated by the input of the signal from the OR gate 8, operates to allow the vehicle speed to increase when a high-level signal, which is the first electric signal, is input, and when a low-level signal, which is the second electric signal, is input. It operates to suppress the increase in vehicle speed. For example, by opening and closing a fuel passage and an intake passage (not shown) using this operating mechanism, it is possible to allow an increase in vehicle speed when the passage is opened, and to suppress an increase in vehicle speed when it is closed.

Next, the operation will be explained with reference to FIG.

(1) When the main switch 22 is off, all signals are also at low level (0).

(2) When the main switch 22 is turned on, the power supply 2
4 is supplied. At this time, when the transmission is in the neutral state, the neutral switch 12 is turned on and the neutral lamp circuit 14 is rendered conductive.

(3) When the neutral switch 12 is turned on, the output of the OR gate 8, that is, the signal at point f becomes high level. As a result, even when the vehicle speed detection circuit 6 is in a stopped state where the vehicle speed is not detected, the operating mechanism 10 operates to allow an increase in engine output, so that warm-up operation and racing can be performed. Note that when the indicator lamp 16 is burnt out, the bypass resistor 18 makes it conductive, so no problem occurs.

(4) When the clutch (not shown) is operated and disengaged to start, the clutch switch 26 is turned on. When the clutch switch 26 is turned on, the signal at point d becomes high level, and the output of the clutch disengagement detection circuit 4, that is, the signal at point e becomes high level. As a result, even if the neutral switch 12 is turned off by switching the transmission from the neutral state to the engaged state, the signal at point f of the OR gate 8 is maintained at a high level, so that the vehicle can start moving.

Even if the clutch is connected and the clutch switch 26 is turned off at the start of the start, the delay circuit 2
8, the signal at point e is held at a high level for a set time t. During this set time t, the vehicle speed after the start is detected and the output of the vehicle speed detection circuit 6, that is, the signal at point a becomes high level, so that the vehicle is allowed to run after the start.

These continuous operations allow the vehicle to take off and start traveling.

(5) After starting driving, the signal at point a of the vehicle speed detection circuit 6 is at a high level within the set vehicle speed range, so
The f point of the OR gate 8 is maintained at a high level and normal running is possible.

(6) When the vehicle speed becomes equal to or higher than the set vehicle speed, the signal at point a of the vehicle speed detection circuit 6 becomes low level, so the signal at point f of the OR gate 8 also becomes low level. Therefore, the operating mechanism 10 operates to suppress the increase in engine output, thereby limiting the increase in vehicle speed. When the vehicle speed falls within the set vehicle speed range, the vehicle speed detection circuit 6 sets the signal at point a of the OR gate 8 to a high level, allowing the vehicle to run.

In such a vehicle speed limiting device, if the vehicle speed detection circuit 6 is made incapable of detecting the vehicle speed by removing or disconnecting the vehicle speed detecting mechanism or circuit provided in the vehicle speed detecting circuit 6 in order to cancel the vehicle speed limit, point a of the vehicle speed detecting circuit 6 signal becomes low level. Therefore, even if the vehicle starts running, the signal from the OR gate 8 becomes low level after the set time t has elapsed since the clutch is engaged, thereby suppressing an increase in the engine output. Furthermore, if the vehicle speed detection circuit 6 is removed or the output wiring to the OR gate 8 is cut, a high level signal will not be input from the vehicle speed detection circuit 6 to the OR gate 8 after the set time t has elapsed since the clutch is connected, and the engine output will also be suppress the increase in

Therefore, if the vehicle speed cannot be detected or the vehicle speed detection circuit is removed or the output wiring is cut in order to cancel the vehicle speed restriction, the vehicle speed restriction will function and cannot be canceled, thereby preventing modification. Furthermore, if the vehicle is modified, the engine output will not be allowed to increase unless the transmission is in the neutral state, the clutch is disengaged, or within the set time t after the clutch is engaged, and the vehicle speed limit will function once the vehicle is in the running state.

Furthermore, if the wiring is cut or parts are removed, the vehicle speed will be restricted.

[Effect of the invention] As described above, according to this invention, if the vehicle speed detection mechanism, circuit, and wiring are removed or disconnected in order to release the vehicle speed restriction, the system operates to suppress the increase in engine output. The mechanism operates. For example, if the vehicle speed cannot be detected due to removal of the speedometer cable, etc., the vehicle speed detection circuit will output the second electrical signal. Therefore, even if the vehicle starts running, the OR gate outputs a second electric signal after a set time has elapsed since the clutch is engaged, thereby suppressing an increase in engine output. Further, even if the vehicle speed detection circuit is removed or the output wiring is cut, the OR gate similarly outputs the second electric signal to suppress an increase in engine output.

For this reason, even if the vehicle is modified to remove the speed limit,
The vehicle speed restriction functions and cannot be canceled, and the cancellation of the vehicle speed restriction can be prevented.

[Brief explanation of the drawing]

The figures show an embodiment of this invention, with FIG. 1 being a circuit explanatory diagram and FIG. 2 being a signal graph diagram explaining the operation. In the figure, 2 is a neutral state detection circuit, 4 is a clutch release detection circuit, 6 is a vehicle speed detection circuit, 8 is an OR gate, 10 is an operating mechanism, 12 is a neutral switch,
14 is a neutral display circuit, 26 is a clutch switch,
28 is a delay circuit.

Claims (1)

[Scope of utility model registration request] a neutral state detection circuit that detects a neutral state of the internal combustion engine transmission and outputs a first electrical signal, and outputs a second electrical signal in a state other than neutral; and a neutral state detection circuit that detects clutch disengagement and outputs the first electrical signal. a clutch disengagement detection circuit which outputs the signal and outputs the first electrical signal for a set time after the clutch is connected and outputs the second electrical signal after the set time has elapsed; a vehicle speed detection circuit that outputs the first electrical signal and also outputs the second electrical signal when the vehicle speed is higher than a set vehicle speed and when the vehicle speed is not detected; an OR gate that outputs a first electrical signal when at least one signal is input, and outputs a second electrical signal when all the second electrical signals are input from each of the detection circuits; and an operating mechanism that operates to allow an increase in engine output when the first electrical signal is input, and operates to suppress an increase in engine output when the second electrical signal is input. Characteristic vehicle speed limiting device.