JPH0338435Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a vehicle speed limiting device, and in particular, when the vehicle speed detection section is rendered inactive due to modification, the opening/closing mechanism that opens and closes the fuel supply system is opened. The present invention relates to a vehicle speed limiting device that is not operated and can prevent unnecessary release of vehicle speed limitation.

[Prior Art] Conventionally, a vehicle speed limiting device for limiting the maximum speed of an automobile is constructed as shown in FIG. In the figure, 2 is an electromagnetic valve which is an opening/closing mechanism for opening and closing a fuel passage of a carburetor (not shown), 4 is a control section, and 6 is a signal oscillation section. The control section 4 opens the solenoid valve 2 only when a predetermined signal voltage V1, which is a predetermined electric signal, is input from the signal oscillation section 6. Therefore, when a voltage other than the predetermined signal voltage V1 is input, the solenoid valve 2 closes. The signal oscillator 6 consists of a regulator 28 for a predetermined signal voltage V1, and a contact 32 or gate that detects the vehicle speed and is turned on when the vehicle speed is less than the set speed and turned off when the speed is higher than the set speed.

In the vehicle speed limiting device, when the vehicle speed is less than the set vehicle speed, a predetermined signal voltage V1 is input from the signal oscillation unit 6 to the control unit 4 when the contact 32 is turned on, and the high voltage cut comparator 22
and the low voltage cut comparator 24. Fourth
As shown in the figure, the predetermined signal voltage V1 is the A point voltage VH
and the point B voltage VL, the point C voltage becomes the operating voltage V2 at which the transistor 26 is turned on.
Therefore, the solenoid 10 is energized and excited,
The solenoid valve 2 is opened to allow fuel supply.

On the other hand, in the vehicle speed limiting device, when the vehicle speed exceeds the set speed, the contact 32 is turned off and the predetermined signal voltage V1 is no longer output, so the voltage at point C also becomes 0. Therefore, the solenoid 10 is de-energized, and the electromagnetic valve 2 operates to close and release, thereby suppressing an increase in vehicle speed.

[Problems to be solved by the invention] In such a vehicle speed limiting device, the contact point 32, which is the vehicle speed detection section, detects the vehicle speed based on the number of rotations of a speedometer cable (not shown), which is the vehicle speed measuring mechanism, and turns on the vehicle speed.・If the speedometer cable is removed due to modification while the speedometer is off, the detected vehicle speed will be 0. Therefore, since the detected vehicle speed is less than the set vehicle speed, the contact point 32 serving as the vehicle speed detection section does not operate and is kept in the on state. As a result, the solenoid valve 2 is opened to allow fuel supply, resulting in the inconvenience that the vehicle speed restriction is easily lifted. In addition, some conventional vehicle speed limiting devices could be easily modified because the vehicle speed limit would be canceled if the vehicle speed detection section was removed and the power supply was directly connected to the control section. 54-35612).

[Purpose of the invention] Therefore, this invention aims to remove the vehicle speed measurement mechanism and make the vehicle speed detection part inactive by modifying it in order to cancel the vehicle speed limit, or to directly connect the power supply, or To provide a vehicle speed limiting device in which an opening/closing mechanism for opening and closing a fuel supply system is not operated when the power source is cut off, thereby preventing unnecessary release of vehicle speed limitation.

[Means for solving the problem] In order to achieve this objective, this invention provides an opening/closing mechanism for opening and closing the fuel supply system of an internal combustion engine, and controls a predetermined amount of electricity between the power cut state and the power direct connection state. A signal generating section that generates a predetermined electrical signal, a vehicle speed detecting section that detects the vehicle speed based on the operating state of the vehicle speed measuring mechanism, and a vehicle speed detecting section that allows the output of the predetermined electrical signal when the vehicle speed is less than the set vehicle speed, and outputs the predetermined electrical signal when the vehicle speed is higher than the set vehicle speed. a signal oscillator comprising an output suppressing section for suppressing the output of a signal; a control section for opening the opening/closing mechanism only when the predetermined electric signal is input; Non-operation detection that detects the non-operation state of the vehicle speed detection section and suppresses the output of the predetermined electric signal by the output suppression section of the signal oscillation section when the vehicle speed detection section is in the non-operation state of detecting only a vehicle speed lower than a set vehicle speed. It is characterized by having a section.

[Function] The vehicle speed limiting device according to this invention opens and closes the opening/closing mechanism for opening and closing the fuel supply system by the control section only when a predetermined electric signal is input from the signal oscillation section, thereby enabling the vehicle to run. The vehicle speed is suppressed by suppressing the output of the predetermined electric signal from the signal oscillator to prevent the opening/closing mechanism from opening. In order to remove the vehicle speed limit of this device, when the vehicle speed measuring mechanism is removed and the vehicle speed detection section is rendered inactive by modification, the non-operation detection section detects this and the output suppressing section of the signal oscillation section generates a predetermined electric signal. Suppress output. Since the opening/closing mechanism is not opened by this output suppression, the vehicle speed restriction is not lifted. In addition, when modifying the vehicle to remove the vehicle speed limit, the power source must be directly connected or disconnected.
The opening/closing mechanism will not be opened due to input other than the predetermined electrical signal, and the speed limit will not be canceled.

[Example] Next, an example of this invention will be described in detail based on the drawings. Figures 1 and 2 show an embodiment of this invention. In the figure, 2 is an electromagnetic valve as an opening/closing mechanism, 4 is a control section, 6 is a signal oscillation section, and 8 is an inoperation detection section.

The solenoid valve 2 opens when the solenoid 10 is energized, and closes when the solenoid 10 is de-energized. This opening/closing operation of the solenoid valve 2 causes the internal combustion engine 12 to open and close as shown in FIG.
An intake passage 16 of a carburetor 14, which is a fuel supply system, is opened and closed by a valve body 18. Alternatively, a fuel passage (not shown) can be opened and closed.

The control section 4 opens the electromagnetic valve 2 only when a predetermined signal voltage V1, which is a predetermined electric signal, is input from a signal oscillation section 6, which will be described later. The control section 4 includes a high voltage cut comparator 22 and a low voltage cut comparator 24 that are incorporated in the electromagnetic valve 2 and input and compare signal voltages from the signal oscillation section 6, and these comparators 22, 24. The transistor 26 is turned on and off by the output of the transistor 26 to control the energization of the solenoid 10.

The signal oscillation unit 6 is provided in a speedometer unit (not shown) that is a vehicle speed measurement mechanism, and is connected to a power source 20.
A regulator 28 for a predetermined signal voltage V1, which is a signal generator that generates a predetermined electrical signal V1 set to a predetermined amount of electricity between a disconnected state and a directly connected state of a power source 20, and a speedometer cable that constitutes a vehicle speed measuring mechanism. Contact point 32, which is a vehicle speed detection unit, detects the vehicle speed based on the rotation speed of 30, and turns on when the vehicle speed is less than the set speed, and turns off when the set speed is higher than the set speed.
When the vehicle speed is lower than the set vehicle speed, the setting point 32 is turned on and the regulator 28 is turned off, allowing the output of the predetermined signal voltage V1 without reducing the output of the regulator 28. At the vehicle speed above the set speed, the contact 32 is turned off and the regulator 28 is turned on. The transistor 34 is an output suppressing section that lowers the output of the signal 28 and suppresses the output of the predetermined signal voltage V1. That is, the regulator 28
One end of the contact 32 and the base of the transistor 34 are connected to the input side of the transistor 34 . The collector of the transistor 34 is connected to the output side of the regulator 28, and the emitter is grounded.

The control unit 4 controls the input signal voltage to be a predetermined voltage.
V1, the predetermined signal voltage V1 is set lower than the A point voltage VH of the high voltage cut comparator 22 and higher than the B voltage VL of the low voltage cut comparator 24 (VL<V1< VH), the voltage at point C becomes the operating voltage V2 that turns on the transistor 26.

On the other hand, the control unit 4 is configured such that the input signal voltage is A by direct connection with the power supply 20, for example.
If it is higher than the point voltage VH, it is cut by the high voltage cut comparator 22. In addition, if the input signal voltage is lower than the B point voltage VL due to a short circuit to the ground side, which is a disconnected state of the power supply 20, for example,
It is cut by the low voltage cut comparator 24. Therefore, the voltage at point C does not reach the operating voltage V2 at which the transistor 26 is turned on. This allows the power supply 20
It is possible to prevent energization of the solenoid 10 due to a direct connection to the ground or a short circuit to the ground side, thereby preventing modification to release the vehicle speed restriction, and since the voltage is cut off, the vehicle speed restriction function is not impaired.

Further, the signal oscillator 6 connects the other end of the contact 32 to a cable terminal 36 provided at one end of the speedometer cable 30. The other end of the speedometer cable 30 is grounded via a ground terminal 38. This causes the contact 32 to be grounded via the speedometer cable 30. The speedometer cable 30, the cable terminal 36, the ground terminal 38, the contact 32 of the signal oscillation unit 6, and the transistor 34 can be used to connect the speedometer, for example, if the vehicle speed measuring mechanism is removed and the contact 32 becomes inactive. When the contact 32 becomes inactive to only detect a vehicle speed lower than the set vehicle speed due to removal of the cable 30, an inoperation detection unit detects the inoperation state of the contact 32 and suppresses output of the predetermined signal voltage V1. 8.

Next, the effect will be explained.

When the vehicle is running at a speed lower than the set speed, contact 32
is on, the base-emitter of transistor 34 is at a low level, and transistor 34 is turned off. When the transistor 34 is turned off, the output of the regulator 28 is not reduced, allowing the output of the predetermined signal voltage V1. As a result, the control unit 4 excites the solenoid 10 to open the electromagnetic valve 2, allowing fuel supply. Therefore, the vehicle can increase its speed.

When the vehicle speed exceeds the set vehicle speed, the contact 32 is turned off and the base-emitter voltage becomes high level, so the transistor 34 is turned on. When the transistor 34 is turned on, the output of the regulator 28 flows from the collector to the emitter to the ground side and is lowered, so that the output of the predetermined voltage signal V1 is suppressed.
As a result, the control unit 4 cuts off the power to the solenoid 10, and the solenoid valve 2 closes. For this reason,
Suppress the increase in vehicle speed.

When the vehicle speed decreases below the set vehicle speed, the signal generator 6 causes the controller 4 to open the solenoid valve 2 to permit fuel supply.

When the speedometer cable 30 is removed by modification in order to cancel the vehicle speed limit, even if the contact 32 is in the on state, the flow no longer flows to the ground terminal 38 side, and the level between the base and emitter of the transistor 34 becomes high. Therefore, the transistor 34 is turned on, the output of the regulator 28 is lowered, and the output of the predetermined signal voltage V1 is suppressed. As a result, even though the contact point 32 is on, the solenoid 1 of the control section 4
0 is cut off and the solenoid valve 2 is not opened, making it impossible to increase the vehicle speed. Therefore, it is possible to prevent unnecessary cancellation of vehicle speed restrictions due to modification.

Also, the speedometer cable 30 is used to ground the transistor 34, and the transistor 34 is turned on/off.
It has a simple structure and is easy to manufacture because it only needs to be turned off.

In addition, in order to remove the vehicle speed limit, the power supply 2
0 is directly connected to the control unit 4 or disconnected, the solenoid valve 2 will not be opened by input other than the predetermined electric signal, and the speed limit will not be canceled. Therefore, unnecessary cancellation of the vehicle speed restriction due to modification can be prevented, and the vehicle speed restriction function will not be impaired.

[Effects of the invention] As described above, according to this invention, when the vehicle speed measuring mechanism is removed due to modification to cancel the vehicle speed restriction and the vehicle speed detection section is rendered inactive, the non-operation detection section becomes inoperative. Upon detection, the output suppressing section of the signal oscillating section suppresses the output of the predetermined electrical signal. For this reason, the opening/closing mechanism that opens and closes the fuel supply system is not opened and closed like in the past, and therefore cannot cancel the vehicle speed restriction, thereby making it possible to prevent unnecessary cancellation of the vehicle speed restriction. Furthermore, since the structure is simple, the cost is low and manufacturing is easy.

Furthermore, since the opening/closing mechanism is opened only when a predetermined electrical signal is input, it is possible to prevent the vehicle speed restriction from being canceled due to a direct connection to the power source or a short circuit to the ground side, which is disconnected. Vehicle speed can be appropriately limited without any damage.

[Brief explanation of drawings]

Figures 1 and 2 show an embodiment of this invention, with Figure 1 being an explanatory diagram of the circuit, and Figure 2 being a sectional view of the intake passage showing the state in which the opening/closing mechanism is installed. Figures 3 and 4 show a conventional vehicle speed limiting device, Figure 3 is a circuit explanatory diagram, and Figure 4 shows a conventional vehicle speed limiting device.
The figure is a graph diagram showing the relationship between the signal voltage value input to the control section and the operating voltage of the transistor 26. In the figure, 2 is a solenoid valve, 4 is a control unit, 6 is a signal oscillation unit, 8 is an inoperation detection unit, 10 is a solenoid, 28 is a regulator for signal voltage, 30 is a speedometer cable, 32 is a contact, and 34 is a The transistor 38 is a ground terminal.

Claims (1)

[Scope of utility model registration request] An opening/closing mechanism is provided to open and close the fuel supply system of the internal combustion engine, and the vehicle speed is determined by the operating state of the signal generator and the vehicle speed measurement mechanism, which generates a predetermined electrical signal set to a predetermined amount of electricity between the power cut state and the power direct connection state. A signal oscillation section is provided, which includes a vehicle speed detection section that detects the vehicle speed, and an output suppressing section that allows the output of the predetermined electrical signal when the vehicle speed is less than a set vehicle speed, and suppresses the output of the predetermined electrical signal when the vehicle speed is higher than the set vehicle speed. A control section is provided that opens and closes the opening/closing mechanism only when a signal is input, and when the vehicle speed detecting section is in an inoperable state in which it only detects vehicle speeds lower than a set vehicle speed due to removal of the vehicle speed measuring mechanism, the vehicle speed detecting section 1. A vehicle speed limiting device comprising: an inoperation detection section that detects an inoperation state of the vehicle and suppresses output of the predetermined electric signal by an output suppression section of the signal oscillation section.