JP3072380B2 - Vehicle anti-theft device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a vehicle antitheft device used for a vehicle having a capacitor discharge ignition unit.

[Prior Art] In a vehicle having a capacitor discharge ignition (CDI) unit, when the main key switch is turned off or the key is removed, the operation of the CDI unit is prohibited so that the engine cannot be started. Prevents theft.

FIG. 2 is a circuit diagram of this conventional vehicle anti-theft device. Reference numeral 10 is a CDI ignition unit, 11 is a charging coil of a magneto generator, 12 is a pulsar coil, 13 is an ignition coil, and 14 is a spark plug. is there. The AC output of the charging coil 11 is
Rectified by the diode D1 of the CDI ignition unit 10,
The positive half wave charges the capacitor C to the polarity shown. Then, the ignition thyristor SCR1 is fired by an ignition pulse output from the pulsar coil 12 at a predetermined timing, and is discharged through the capacitor C and the primary side of the ignition coil 13, and is induced at the secondary side of the ignition coil 13 at this time. A high voltage generates a spark in the spark plug 14.

Here, the charging end (+ end) of the capacitor C is grounded via the diode D2 and the normally closed contact 15a of the main key switch 15. The main key switch 15 is connected to the coupler 16
The coupler 16 is housed near the main key switch 15.

In the conventional device configured as described above, if the main key switch 15 is turned off or the main key is removed, the normally closed contact 15a grounds the charged end of the capacitor C. The unit 10 is deactivated and the engine does not start.

[Problems to be Solved by the Invention] By the way, in a vehicle such as a motorcycle, if the wiring of the main key switch 15 is cut or the coupler 16 is cut off at the position indicated by the arrow, the charged end of the capacitor C is grounded. Can be separated from For this reason, cut the wiring,
Alternatively, by disconnecting the coupler 16, the engine can be started, and the anti-theft function of the vehicle is reduced.

If a special prevention circuit is provided separately from the capacitor discharge ignition unit in order to prevent this, the vehicle antitheft device itself must be enlarged.

The present invention has been made in view of such circumstances,
It is an object of the present invention to provide an anti-theft device for a vehicle that uses a capacitor discharge ignition unit and is difficult to be stolen because the engine cannot be started even if the wiring near the main key switch is cut, and that can make the device itself compact. The purpose is.

Means for Solving the Problems In order to solve the problems, the present invention connects a charging coil of a magneto type generator to a capacitor via a diode, connects an ignition coil to the capacitor, and A capacitor discharge type ignition unit in which an ignition thyristor is connected between the capacitor and the output of a pulser coil connected to the gate of the ignition thyristor to operate the ignition thyristor to spark a secondary side ignition plug of the ignition coil. In the vehicular anti-theft device for prohibiting charging or discharging of the capacitor of the capacitor discharge type ignition unit at an off position of a main key switch, between the capacitor and the charging coil, for charging the capacitor. Connect a discharge thyristor that short-circuits the current, and A divided voltage by a resistor is applied to the gate of the discharge thyristor, and a main key switch having a normally open contact is connected, and the anode is discharged between the main key switch and the divided voltage point of the gate of the discharge thyristor. A diode is connected to the gate side of the thyristor, the cathode is connected to the main key switch side, and when the main key switch is in the OFF position, the discharge thyristor is closed to short-circuit a current for charging the capacitor. And

According to the present invention, a discharge thyristor for short-circuiting a current for charging a capacitor is connected, a divided voltage by a resistor is applied to a gate of the discharge thyristor, and a main key switch having a normally open contact is connected to the discharge thyristor. When the key switch is in the OFF position, the current for charging the capacitor is closed by closing the discharge thyristor, so if the wiring near the main key switch is cut or the coupler connecting the main key switch is disconnected Is
The state is the same as when the main key switch is off, and the current for charging the capacitor is short-circuited by closing the discharge thyristor to cause a misfire. Therefore, the engine cannot be started and is hardly stolen.

Also, a diode is connected between the main key switch and the divided voltage point of the gate of the discharge thyristor with the anode on the gate side of the discharge thyristor and the cathode on the main key switch side. Even if headlights, various instruments, and the like are arranged, the diode prevents the current from flowing back to the gate of the discharge thyristor, and the discharge thyristor does not malfunction during ignition operation.

Further, since the discharge thyristor can be incorporated in the CDI ignition unit, the vehicle antitheft device itself can be made compact.

[Embodiment of the Invention] Next, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a circuit diagram of a vehicle anti-theft device showing one embodiment of the present invention.

In FIG. 1, reference numeral 10 denotes a CDI ignition unit, and a charging coil 11 of a magneto generator is connected to a diode D1 of the CDI ignition unit 10. An ignition thyristor SCR1 is connected between the diode D1 and the capacitor C of the CDI ignition unit 10, and a pulsar coil is connected to the gate of the ignition thyristor SCR1.
12 are connected. An ignition coil 13 is connected to the capacitor C of the CDI ignition unit 10, and an ignition plug 14 is connected to the secondary side thereof.

Therefore, the AC output of the charging coil 11 is rectified by the diode D1, and the positive half wave charges the capacitor C to the polarity shown. The ignition thyristor SCR1 is ignited by an ignition pulse output from the pulsar coil 12 at a predetermined timing, and is discharged through the capacitor C and the primary side of the ignition coil 13, and is induced on the secondary side of the ignition coil 13 at this time. A high voltage generates a spark in the spark plug 14.

The CDI ignition unit 10 incorporates an anti-theft device, which has a discharge thyristor SCR2, which is connected between the charging coil 11 and the diode D1 to charge the capacitor C. Because of the short circuit current. The gate of the discharge thyristor SCR2 is the resistance R1, R
The main key switch 15 is connected via a diode D2 for preventing backflow. Thus, the gate of the discharge thyristor SCR2 is grounded via the diode D2 and the normally open contact 15a of the main key switch 15.

Therefore, when starting the engine, the main key switch 15
Is turned on, the normally open contact 15a of the main key switch 15 is closed, so that no gate voltage is applied to the gate of the discharge thyristor SCR2. Therefore, the discharge thyristor SCR2 is in the off state. For this reason, the AC output of the charging coil 11 is rectified by the diode D1, and the capacitor C is charged to the polarity shown by the positive half-wave, and the normal operation is performed.

On the other hand, when the normally open contact 15a of the main key switch 15 is open, a gate voltage is applied to the discharge thyristor SCR2, so that the discharge thyristor SCR2 is triggered by its own charge and is turned on. For this reason, the AC output of the charging coil 11 is rectified by the diode D1 and the capacitor C is not charged, so that the ignition plug 14 is misfired and the engine does not start.

If the wiring of the main key switch 15 is cut at the position indicated by the arrow or the coupler of the main key switch 15 is disconnected, the discharge thyristor SCR2 is turned on by its own charge, and the current is dropped to ground. The state is the same as when the key switch 15 is off, and the engine does not start.

Also, between the main key switch 15 and the divided voltage point of the gate of the discharge thyristor SCR2, the diode D2 was connected with the anode on the gate side of the discharge thyristor SCR2 and the cathode on the main key switch side. Even if, for example, headlights or various instruments are arranged near 15, the discharge thyristor SCR2
Current is prevented from flowing backward to the gate of the discharge thyristor SCR2 during the ignition operation.

[Effects of the Invention] As described above, in the present invention, a discharge thyristor for short-circuiting a current for charging a capacitor is connected, a divided voltage by a resistor is applied to a gate of the discharge thyristor, and a normally open contact is opened. When the main key switch is connected and the main key switch is in the off position, the discharge thyristor is closed and the current for charging the capacitor is short-circuited. If the coupler connecting to the mains switch is disconnected, it will be in the same state as when the main key switch is off, and the engine will be able to start because the current to charge the capacitor will be short-circuited by closing the discharge thyristor and causing a fire. Hard to be stolen.

Also, a diode is connected between the main key switch and the divided voltage point of the gate of the discharge thyristor with the anode on the gate side of the discharge thyristor and the cathode on the main key switch side. Even if headlights, various instruments, and the like are arranged, the diode prevents the current from flowing back to the gate of the discharge thyristor, and the discharge thyristor does not malfunction during ignition operation.

Further, since the discharge thyristor can be incorporated in the CDI ignition unit, the vehicle antitheft device itself can be made compact.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a vehicle antitheft device showing one embodiment of the present invention, and FIG. 2 is a circuit diagram of a vehicle antitheft device showing a conventional example. In the drawing, reference numeral 10 is a CDI ignition unit, 11 is a charging coil, 12
Is a pulser coil, 13 is an ignition coil, 14 is a spark plug, 15
Is the main key switch, SCR1 is the ignition thyristor, SCR2 is the discharge thyristor, C is the capacitor, D2 is the diode, R
1, R2 is a resistor.

Continuation of the front page (56) References JP-A-55-81269 (JP, A) JP-A-3-121953 (JP, A) JP-A-56-21931 (JP, A) (58) Fields investigated (Int) .Cl. ⁷ , DB name) B62H 5/08 B60R 25/04

Claims (1)

(57) [Claims] 1. A charging coil of a magneto generator is connected to a capacitor via a diode, an ignition coil is connected to the capacitor, and an ignition thyristor is connected between the diode and the capacitor. A capacitor discharge ignition unit that activates the ignition thyristor by an output of a pulsar coil connected to a gate to spark an ignition plug on a secondary side of the ignition coil, and controls charging or discharging of the capacitor of the capacitor discharge ignition unit. In a vehicle anti-theft device forbidden at the off position of a main key switch, a discharge thyristor for short-circuiting a current for charging the capacitor is connected between the capacitor and the charging coil, and a gate of the discharge thyristor is connected to the discharge thyristor. Apply divided voltage by resistance and open normally And a diode between the main key switch and the divided voltage point at the gate of the discharge thyristor, with the anode being on the gate side of the discharge thyristor and the cathode being on the main key switch side. A vehicle anti-theft device that is connected to short-circuit a current for charging the capacitor by closing the discharge thyristor when the main key switch is in an off position.