JPS5826207Y2 - Anti-theft device for motorcycles - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a device for preventing theft of a two-wheeled vehicle.

Unlike passenger cars, motorcycles cannot be locked, so they can be easily accessed near the ignition switch, and even without an ignition key, it is possible to kickstart a motorcycle by simply connecting the power cable directly to the ignition circuit. 1 Theft is much more common than passenger cars.

By the way, statistically speaking, connecting the power line directly to the ignition circuit is the most common cause of theft.

Normally, the direct connection method described above is to cut the ignition switch wire harness and connect the power wire directly to the ignition coil, or to pull out the ignition switch connector inside the headlamp housing, which is easy to remove, and lead between the wire harness connector terminals. This was done by short-circuiting wires, etc.

This idea was created by focusing on the points mentioned above.

The first purpose is to prevent theft of two-wheeled vehicles by disconnecting the wire harness containing the ignition circuit or uncoupling the connector without the ignition key being inserted, which activates the alarm to alert the user of theft. There is a Q that provides a prevention device.

The second purpose of this invention is to provide a theft prevention device for a two-wheeled vehicle in which an alarm is activated to notify of theft when the power line is connected to the primary side of the ignition coil without the ignition key inserted. .

Next, one embodiment of this invention will be described with reference to the drawings.

1 is an ignition switch whose contacts change when the key is inserted; 2 is a battery mounted on a motorcycle; 3
is the ignition coil including contact points, 4
) Theft detection circuit according to this invention, 5t-x battery 2. Primary coil of ignition coil 3, theft detection circuit 4. Connect the ground to the power line 1. Signal line L2. Ignition wire L3. Wire harness 6 consisting of ground wire L4
This is a connector that connects to the ignition switch 1 via the ignition switch 1.

The theft detection circuit 4 is an alarm device B such as a buzzer. Thyristor Q,
Reed relay S, diode D.

It is composed of resistors R1 to R6 and a capacitor C.

Note that one end of the alarm B is directly connected to the battery 2, and one end of the coil of the reed relay S is connected to the signal line L2. Connector 5
The ignition switch 1 is connected through the ignition switch 1.

Furthermore, one of the primary sides of the ignition coil 3 is connected to the ignition wire L3,
The other end is connected to ground via a contact point.

Also, one end of the coil of the reed relay S and one end of the resistor R1 are connected via the ignition wire L3 and the diode, the other end of the reed relay coil is connected to the signal line L2, and the other end of the resistor R1 is connected to the ground (respectively). It is connected.

The series circuit of battery 2f, alarm B and thyristor Q is connected in parallel, and the alarm B is connected in parallel with resistor R2.

Both ends of the thyristor Q (the series circuit of the reed relay S, capacitor C, and resistors R4 and R6 are connected to the resistor R3)
The gate of the thyristor Q is connected to the connection point between the resistors R4 and R6.

The following circuit configuration is described above [To explain the operation based on this,
If the thief tries to start the engine without a key and cuts the wire harness 6 or disconnects the connector 5, then the battery -2 -> power line L1 -> connector 5 -> ignition switch 1 -> signal line L2 -> lead Reed relay S with closed loop of relay S coil → resistor R1 → ground
Since the current flowing to the coil is cut off, the contacts of the reed relay S are opened, and a current according to the divided voltage value flows through the gate of the thyristor Q through the resistors R2 to R4 and the resistor R5. is in the on state.

As a result, alarm device B is energized and activated, and an alarm is issued.

Next, if a thief connects the power supply line L1 and the ignition line L3, when the ignition coil 4 is energized, the reed relay S is connected via the diode D.
Since a positive voltage is also applied to the ground side of the coil, both ends of the coil have the same potential, no magnetic field is generated, and the contacts of the reed relay S are opened.

Therefore, the alarm B is activated and an alarm is issued through the same operation as in the case described above.

In addition, when the key is inserted and the ignition switch 1 is switched, battery 2 → power line L1 → connector 5 → ignition switch 1 → connector 5 → ignition line L3 → diode D → coil of Ri-1 relay S → signal line L2 → Connector 5 -> Ignition switch 1 -> Connector 5 -> Earth 1L+ -> Earth The coil of reed relay S is energized (since this is energized, the current from battery 2 is passed through resistor R2 -> contact of reed relay S -> earth). The gate current of thyristor Q does not flow.

When the key is inserted and the ignition switch 1 is switched, the current to the coil of the reed switch S is momentarily cut off and its contacts are opened.

The current flowing through the resistor R2 flows into the temporary capacitor C, and the gate current of the thyristor Q does not flow.

Therefore, alarm B will not operate at this time.

As mentioned above, this idea connects the other end of the reed relay coil through the ignition switch to the power wire (this end is connected to the other end of the reed relay coil), and then the connector is uncoupled or the wire is connected to the other end of the reed relay coil. The alarm is activated when the harness is disconnected and the power to the reed relay coil is cut off, or when the power line and ignition wire are connected and both ends of the reed relay coil are of the same type (i+) and the contacts are opened. Even if the connector is uncoupled, the wire harness is disconnected, or the ignition is connected to the battery, the alarm will still be emitted as long as the key is removed, thus preventing theft. Since the anti-theft device is activated by removing the ignition key, there is no need for special operations to set the device, which prevents forgetting to set the device. This has the effect of making thieves more wary and reducing the chances of them destroying or disabling the anti-theft device.

[Brief explanation of the drawing]

The figure is an electrical circuit diagram showing an embodiment of the anti-theft device for a two-wheeled vehicle according to the present invention. 1...Ignition switch, 2...
・Battery, 3...Ignition coil,
4... Theft detection circuit, 5... Connector, 6... Wire harness, L1...
Power line, L4...Earth wire, S...Reed relay, Q...Silice, B...
・Alarm.

Claims (1)

[Scope of claim for utility model registration] To the power line when the ignition switch is off. The other end of the coil of the reed relay, which is connected to the ground wire through the connector when it is on, is connected to the ignition coil through the diode, and when it is closed, the other end of the reed relay coil is connected to the ignition coil through the diode. This anti-theft device for a two-wheeled vehicle is constructed by connecting a switching circuit that flows to ground through the circuit and turns on a switching element such as a thyristor when opened, and an alarm as a load of the switching circuit.