JPH0533733Y2 - - Google Patents

Description

[Detailed Description of the Invention] a. Field of Industrial Application The present invention relates to an engine stop circuit, particularly to an engine stop circuit for small two-wheeled vehicles.

b. Prior Art FIG. 2 is a circuit diagram of an example of an engine stop circuit according to the prior art.

Figure 2 shows a circuit in which an engine stop switch is attached to a circuit called a capacitor discharge ignition (CDI) circuit. A half-wave rectifier circuit is formed by the capacitor charge coil CC and the first diode D1, and the second diode D has an anode connected to the cathode of the first diode D1.
2, a capacitor C having one pole connected to the cathode of the second diode D2, and an ignition coil primary side having one end connected to the other pole of the capacitor C.
A closed circuit is formed by IG1 and a grounding line G connecting the other end of the ignition coil primary side IG1 and the anode of the first diode D1. Furthermore, the cathode of the second diode and the capacitor C
A thyristor SCR is provided with an anode connected to a midpoint between the two and a cathode connected to a ground line G, and a signal from the pulser coil PC is applied to the gate of the thyristor SCR via a third diode D3 and a resistor R.

When the thyristor SCR is non-conducting, the capacitor C is charged via the second diode D2. When the thyristor SCR becomes conductive due to the signal from the pulser coil PC, the ignition coil 1
A discharge current flows to the next side IG1. As a result, a high voltage is generated on the secondary side of the ignition coil IG2,
ignite the engine.

The engine stop circuit shown in Figure 2 is based on the above-mentioned CDI.
A first switch SW1 is provided in parallel with the capacitor charge coil CC of the circuit.

This switch is operated in conjunction with the ignition switch using the key of the motorcycle, and when driving
It is set to be OFF and ON when the engine is stopped. When this switch is ON, both ends of the capacitor charge coil CC are shorted, so
Capacitor C is not charged. Therefore, no high voltage is generated in the ignition coil, and the engine cannot be ignited.

FIG. 3 is a rear view of the two-wheeled vehicle. The key switch KEY, which turns on and off the first switch, along with the ignition switch, starter switch, etc.
It is installed at the front of the motorcycle.

FIG. 4 is a side view of the front part of the two-wheeled vehicle. Lead wire group L1 connected to the key switch KEY, and lead wire group L2 connected to the engine, brake, etc.
are connected by a connection coupler A.

c. Problems to be solved by the invention The above-mentioned connection coupler A is provided in a cover at the front of the two-wheeled vehicle. These covers may be easily removed by simply removing the screws.
In such a structure, the first switch SW1 provided in parallel to the capacitor charge coil CC can be turned off by removing the covers and disconnecting the connection coupler.
In other words, if you remove the ignition switch connection coupler, engine stop will no longer work. As a result, two-wheeled vehicles are often stolen due to the ignition switch's connection coupler being removed or its lead wires being cut.

d Means to solve the problem The above problem is caused by the capacitor charge coil,
a first diode connected in parallel with the capacitor charge coil; a second diode whose anode is connected to the cathode side of the first diode;
An ignition coil having a capacitor having one pole connected to the cathode side of the second diode, and a primary coil having one end connected to the other pole of the capacitor and the other end being grounded together with the anode side of the first diode. a switching element whose anode is connected to the intermediate point between the cathode of the second diode and the capacitor and whose cathode is grounded; a pulser coil that generates a signal synchronized with engine rotation; and a switching circuit that generates a signal synchronized with the engine rotation. In an engine stop circuit installed in a capacitor discharge type ignition circuit, which is equipped with a control circuit that controls ON/OFF of the switching element, and generates a high voltage in the secondary coil of the ignition coil by the discharge current that flows when the switching element is turned ON. The above control circuit uses a battery as a power source, and is provided with a battery connection switch between the control circuit and the battery, and the battery connection switch is linked with the ignition switch so that it is turned on when the engine is in use and turned off when the engine is stopped. The problem was solved by an engine stop circuit that is operated by the engine.

e Effect When the ignition switch is turned ON, the battery connection switch is also turned ON. At this time, a control signal is sent from the control circuit to the switching circuit in response to the signal from the pulser coil. Therefore, the switching circuit is synchronized with the control signal.
Repeat ON/OFF. In other words, the ignition voltage can be obtained and the engine can be rotated.

On the other hand, if the ignition switch is turned OFF,
In conjunction with this, the battery connection switch is turned off. In this case, the control circuit does not send a control signal to the switching circuit. Therefore, the switch circuit does not change state and no ignition voltage is obtained. In other words, the engine cannot be rotated.

f. Embodiment FIG. 1 is a circuit diagram of a preferred embodiment of the engine stop circuit according to the present invention. Since the circuit of FIG. 1 is an improvement of the circuit of FIG. 2, corresponding members are given common reference numerals and their explanations will be omitted.

This embodiment is an engine stop circuit using a thyristor as a switching circuit and an npn transistor circuit as a control circuit. When the ignition switch is turned on, the first switch SW1 is turned off and the second switch SW2 is turned on. The second switch SW2 functions as a battery connection switch, connects the battery B and the transistor TR, and supplies a positive voltage to the base. A smoothing circuit consisting of a diode D, a capacitor, and a resistor is arranged between the battery B and the base of the transistor to stabilize the voltage. The collector of the transistor TR is connected to the pulser coil, and the emitter of the transistor is connected to the gate of the thyristor via a resistor R1 and grounded via a resistor R2. In this state
Since a positive voltage is applied to the base of the npn transistor, the transistor turns on and off according to the collector voltage of the transistor, and the thyristor
Sends a trigger signal to the SCR gate. As a result,
The thyristor SCR turns on and off in synchronization with the pulser coil.
Repeat OFF. Therefore, a capacitor discharge current flows through the ignition coil, high voltage HV is applied to the ignition, and the engine ignites.

When the ignition switch is turned OFF, the first switch is turned ON and the second switch SW2 is turned OFF.
Since SW2 is OFF, the connection between transistor TR and battery B is cut off, and transistor TR cannot generate a control signal. In this embodiment, since the first switch is ON, the capacitor charge coil is simultaneously shorted and capacitor C is not charged, so that the engine stop circuit is doubled.

Ignition switch, first switch SW
1. If the structure is such that the second switch SW2 is installed at the KEY position in Figure 3, and these switches and the CDI circuit are connected using connection coupler A in Figure 4, simply removing connection coupler A will not connect the battery. Since the connection switch is turned OFF, the engine cannot be ignited.

g. Effects The engine stop circuit according to the present invention turns off the battery connection switch at the same time as turning off the ignition switch. Therefore, it is not possible to start the engine simply by removing the wiring coupler; in order to start the engine without turning on the ignition switch, it is necessary to turn on the battery connection switch in some way. be. However, in order to do this, it is necessary to know the circuit configuration, and the theft of the two-wheeled vehicle can be prevented more reliably than the conventional engine stop circuit, which can start the engine simply by cutting the lead wire.

Since the engine cannot be turned on even when the battery is weak, this is preferable from the viewpoint of battery maintenance.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of a preferred embodiment of an engine stop circuit according to the present invention, Fig. 2 is a circuit diagram of an example of an engine stop circuit according to the prior art, and Fig. 3 shows the installation location of an ignition switch. FIG. 4 is a side view of the front part of the two-wheeled vehicle showing the positions of the ignition switch and the connection coupler. A... Connection coupler, B... battery, C... capacitor, CC... capacitor charge coil, D,
D1, D2...Diode, IG1, IG2...Ignition coil, PC...Pulser coil, R1,
R2...Resistor, SCR...Thyristor, SW1,
SW2...Switch, TR...Transistor.

Claims (1)

[Claims for Utility Model Registration] (1) A capacitor charge coil, a first diode connected in parallel with the capacitor charge coil, and a second diode whose anode is connected to the cathode side of the first diode. and a capacitor having one pole connected to the cathode side of the second diode, and a primary coil having one end connected to the other pole of the capacitor and the other end being grounded together with the anode side of the first diode. a switching element whose anode is connected to the intermediate point between the cathode of the second diode and the capacitor and whose cathode is grounded; a pulser coil that generates a signal synchronized with engine rotation; An engine stop circuit installed in a capacitor discharge type ignition circuit that is equipped with a control circuit that controls ON/OFF of the switching circuit, and generates a high voltage in the secondary coil of the ignition coil by the discharge current that flows when the switching element is turned ON. In this case, the control circuit uses a battery as a power source, and a battery connection switch is provided between the control circuit and the battery, and the battery connection switch is linked with an ignition switch so that it is turned on when the engine is in use and turned off when the engine is stopped. An engine stop circuit characterized in that it is operated as follows. (2) The engine stop circuit according to claim 1, wherein the switching circuit is a circuit using a thyristor. (3) The engine stop circuit according to claim 1, wherein the control circuit is a circuit using a transistor whose base is supplied with current from a battery. (4) The engine stop circuit according to claim 1, wherein the capacitor discharge type ignition circuit has a switch capable of short-circuiting a capacitor charge coil.