JP2696968B2 - Speed limiter for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a vehicle speed limiting device mainly used for motorcycles.

[Prior Art] A conventional motor of this type is provided in a speedometer and includes a speed detection circuit including switching means for turning off or on at a speed higher than a set vehicle speed at which speed is to be limited, and a speed higher than a set speed by the speed detection circuit. And a speed limiting circuit that performs a speed limiting operation upon detecting that the speed of the motor is low (for example, Japanese Patent Application Laid-Open No. 58-202375).

[Problems to be solved by the invention]

However, in the above-described conventional device, whether or not the speed limiting operation is performed is determined only by turning on and off the switching means of the speed detecting circuit. Therefore, a general user connects the speed limiting circuit and the speed detecting circuit with a wire. There is a problem that the speed limiting function can be released very easily only by removing or grounding.

Therefore, an object of the present invention is to prevent a general user from easily releasing the speed limiting function.

[Means for solving the problem]

Therefore, the present invention is provided in a speedometer,
A speed detection circuit including a series circuit of a switching means for turning off at a speed equal to or higher than a set vehicle speed to be speed-limited and a resistor for voltage drop, a constant voltage circuit, a microcomputer, an A / D converter of the microcomputer; A voltage from a circuit is supplied to the A / D converter, and when the supplied voltage is out of a predetermined range, the microcomputer performs a speed limiting operation to perform a speed limiting operation. A bias circuit for applying a bias voltage from the constant voltage circuit via a bias resistor to a series circuit of the switching means and the voltage drop resistor, wherein the bias voltage of the bias circuit is When the vehicle speed limiter is set to a value where the voltage of the speed detection circuit is within a predetermined range when it is on, It is intended to provide.

Also, the switching means may be turned off even when the vehicle speed is low, and then turned on from a higher vehicle speed until the set vehicle speed at which the speed limit is to be reached. Further, the speed limiting operation can be performed only when the engine speed is equal to or higher than the set value.

[Action]

Thereby, when the switching means of the speed detection circuit is turned off at a speed equal to or higher than the set vehicle speed, or when a general user disconnects or grounds the wire connecting the speed limit circuit and the speed detection circuit, the speed detection circuit is turned off. When the voltage exceeds the predetermined range, the speed limiting operation is performed by the ignition device with the speed limiting function. When the switching means of the speed detection circuit is turned on at a speed lower than the set vehicle speed, the voltage of the speed detection circuit falls within a predetermined range by the bias voltage of the bias circuit, so that the ignition device with the speed limit function performs the speed limit operation. Absent.

Also, if the switching means is turned off even when the vehicle speed is low, and is turned on from a higher vehicle speed until the set vehicle speed at which the speed is to be restricted is reached, the wire for driving the speedometer is cut, and the vehicle speed of the speedometer is reduced. Even when it becomes 0, the vehicle speed limiting function can be maintained by turning off the switching means. Also,
Even when the voltage from the speed detection circuit is out of the predetermined range, the vehicle speed limiting function may be canceled when the engine speed is less than the set value.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an overall system diagram of an ignition device for a motorcycle having a speed limiting function according to the present invention, wherein 1 is a battery, 2 is a capacitor charging coil of magneto, 3 is a timing sensor, 4 is a speed detection provided in a speedometer. In the circuit, 41 is a resistor,
43 is a voltage drop resistor, 42 is a light emitting diode, 44 is a phototransistor as switching means, and 45 is a light shielding plate that rotates in conjunction with the speedometer pointer.
The phototransistor 44 has a vehicle speed of 10 to 180 km /
It is set to turn on with h and turn off at other times.
Reference numeral 5 denotes an ignition device with a speed limiting function that constitutes a speed limiting path.
51 is a constant voltage circuit that creates a circuit power supply, 52, 54, and 55 are diodes, 53 is an ignition capacitor, 56 is an ignition thyristor, and 57
Is a signal waveform shaping circuit, 58 is a crystal oscillation circuit, 59 is a microcomputer with a built-in A / D converter, 60 is a driving transistor, 61, 62, and 63 are resistors, and 64 is a speed meter circuit 4.
, 65 indicates an overvoltage protection diode, 80 indicates an ignition coil, and 81 indicates a spark plug.

Figure 2 shows the change of the connection point voltages V ₁ of the resistor 64 and the diode 65 in the present embodiment, the resistance of the resistor 64,43 as the vehicle speed becomes a predetermined intermediate voltage V ₂ at about 10~180km / h The value has been set.

Figure 3 shows the control logic of the speed control unit that is executed by the microcomputer 59, and a V ₁ is V ₂ outside the engine rotational speed is performed only speed limiting operation when the above N ₁ rpm.

Figure 4 shows one example of a speed limiting operation, is intended to rapidly retard the ignition timing in N ₁ or more revolutions.

 Next, the operation of the above configuration will be described.

The constant voltage circuit 51 generates a circuit power supply from the electric power from the battery 1 and supplies it to each circuit. The microcomputer 59 starts operation by power supply and performs initialization. When the magneto rotates and a positive voltage is generated in the capacitor charging coil 2, the diode 52, the capacitor 53, and the diode 54 charge the ignition capacitor 53. When the magneto rotates, a voltage of one cycle is generated in the timing sensor 3 for one rotation, and the waveform shaping circuit 57 outputs one voltage for one rotation of the internal combustion engine.
Times to interrupt the microcomputer 59, the microcomputer 59 measures the interrupt time, seek engine speed by calculating a signal interval time from the time, and outputs an ignition signal to O ₀ ports. O ₀ port "1" from "0" to the falls when the transistor 60 is turned on, the thyristor 56 is turned on gate current is supplied to the thyristor 56, the primary coil of the ignition coil 80 to charge the ignition capacitor 53 , And an ignition spark is obtained at the ignition plug 81. Performs an ignition operation repeats the above operation, substantially the microcomputer 59 in a constant cycle performs A / D conversion of the V ₁ V oltage, V the V ₁ voltage is Figure 2
₂ range, and because when the engine speed is greater than or equal rotation N ₁ are programmed to perform a speed limiting operation, as well as to the vehicle speed does not become equal to or higher than the set speed, for example, the user of the speedometer or opening the speed signal input terminal 5a of the ignition device 5 by removing the speed detection circuit 4, or by connecting the ground or battery voltage, attempting to cancel the speed limiting function, V ₁ voltage in any case Out of V ₂ range (Vcc,
Grounding connections OV), and the speed limit function is activated at engine speed N ₁ or more, can be prevented release by remodeling. Further, even when the speedometer drive cable is broken, the meter indication will always 0km becomes, V ₁ voltage performs speed limiting operation at Vcc becomes N ₁ turn or more, to be hereinafter also set the speed during meter cable break I can do it.

The ON / OFF pattern of the phototransistor 44 may be as shown in FIG. That is, in the case of FIG. 2, the speed limiting operation is also performed during no-load racing (since the meter is 0 km / h during no-load racing), but in the case of FIG. 5, the speed limiting operation is not performed during racing. . In addition, the control logic of the speed limiter indicates that the engine speed is N ₁
rpm "condition may be abolished. However, the fifth
In the case shown in the figure, the speed limiting operation is released when the cable is disconnected.

In the above-described embodiment, the speed limiting operation has been described as retarding. However, the misfire may be caused by changing the position of the exhaust valve or a combination thereof.

Further, in the above-described embodiment, the description has been given of the capacitor discharge type (CD1) ignition device. However, a transistor type ignition device in which the primary current of the ignition coil is turned on and off by a transistor may be used.

Further, in the above embodiment, A / D described in the converter internal microcomputer may be V ₁ voltage determined by a combination of a microcomputer and a comparator dated by the A / D converter. Further, although the description has been made with reference to digital retardation, analog retardation may be used.

In the above-described embodiment, the light emitting diode 42
Although a photoelectric speed detection circuit including a phototransistor 44 and a phototransistor 44 is used, a magnetic speed detection circuit including a permanent magnet and a reed switch or a magnetoresistive element or a Hall element may be used. Reed switch,
Switching means is constituted by the magnetoresistive element, the Hall element itself, or a transistor which is turned on / off in accordance with the operation thereof.

〔The invention's effect〕

As described above, in the present invention, when the switching means of the speed detection circuit is turned off at a speed equal to or higher than the set vehicle speed,
When the general user removes or grounds the wire connecting the speed limiting circuit and the speed detecting circuit, the voltage from the speed detecting circuit falls outside a predetermined range. Is larger than the set value, the speed limiting circuit performs the speed limiting operation, so that there is an excellent effect that it is possible to prevent the general user from easily releasing the speed limiting function. Moreover, by applying a bias voltage to the speed detection circuit provided in the speedometer from the constant voltage circuit of the ignition device with the speed limiting function via a bias resistor, the voltage detection accuracy is high, and the voltage drop resistor is provided. Alternatively, not only can the set voltage be easily changed only by changing the voltage dividing ratio by changing the resistance value of the biasing resistor, but there is no need to provide a Zener diode as a voltage drop element in the speedometer,
The circuit in the speedometer can be made simple and inexpensive because a voltage drop resistor can be used, and the bias power is taken from the constant voltage circuit in the ignition device.
The same power supply as that of the D converter can be used, and there is an excellent effect that variation is small and accuracy can be further improved.

In addition, if the switching means is turned off even when the vehicle speed is low, and is turned on until the vehicle speed reaches the set vehicle speed at which the speed is to be limited, the speed meter driving wire is cut off and the speed meter vehicle speed becomes zero. Also, when the switching means is turned off, the vehicle speed limiting function can be maintained, and the safety can be further improved.

[Brief description of the drawings]

FIG. 1 is an electric circuit diagram showing one embodiment of the device of the present invention, and FIG.
FIG. 3 is a diagram showing a connection point voltage waveform in the above embodiment, FIG. 3 is a control logic diagram of the speed limiter in the above embodiment, FIG. 4 is an ignition timing characteristic diagram in the above embodiment, and FIG. FIG. 6 is a connection point voltage waveform diagram used in FIG. 4 ... speed detection circuit, 5 ... ignition device with speed limit function constituting speed limit circuit, 43 ... resistance forming voltage drop element, 44
…… Phototransistor as switching means, 59…
… Microcomputer, 64 …… a resistor that constitutes a bias circuit.

Claims (3)

(57) [Claims] A speed detecting circuit provided in a speedometer and including a series circuit of a switching means for turning off at a speed equal to or higher than a set vehicle speed at which the speed is to be limited and a voltage drop resistor; a constant voltage circuit; A speed including an A / D converter of a computer, wherein a voltage from the speed detection circuit is supplied to the A / D converter, and a speed limiting operation is performed by the microcomputer when the supplied voltage is out of a predetermined range. An ignition device with a limiting function, and a bias circuit provided in the ignition device and configured to apply a bias voltage from the constant voltage circuit to a series circuit of the switching means and the voltage drop resistor via a bias resistor. The bias voltage of this bias circuit is such that the voltage of the speed detection circuit is within a predetermined range when the switching element is on. The vehicle speed limiting device is set to a value falling. 2. The vehicle speed limiter according to claim 1, wherein said speed limit operation is performed when a voltage from said speed detection circuit is out of a predetermined range and an engine speed is equal to or higher than a predetermined value. 3. The vehicle speed limiting device according to claim 1, wherein said switching means is turned off even when the vehicle speed is low, and is turned on from a higher vehicle speed until reaching a set vehicle speed at which speed limiting is to be performed.