JP2843377B2 - Vehicle anti-theft device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an anti-theft device used for a vehicle having a capacitor discharge ignition device.

(Background of the Invention) In a vehicle having a capacitor discharge ignition (CDI) device, when the main key switch is turned off or the key is removed, the operation of the CDI device is prohibited and the engine cannot be started to prevent theft. Preventing. FIG. 3 is a circuit diagram of the conventional device, wherein reference numeral 10 denotes a CDI unit,
Is a charging coil of the magneto generator, 14 is a pulsar coil, 16 is an ignition coil, and 18 is a spark plug. Charging coil
The 12 AC outputs are rectified by the diode 10a, and the positive half-wave charges the capacitor 10b to the polarity shown. The SCR 10c is fired by an ignition pulse output from the pulsar coil 14 at a predetermined timing, and the capacitor 10
b is discharged through the SCR 10c and the primary side of the ignition coil 16, and a spark is generated in the ignition plug 18 by the high voltage induced at the secondary side of the ignition coil 16 at this time.

Here, the charging end (+ end) of the capacitor 10b is grounded via the diode 10d and the normally closed contact 20a of the main key switch 20. G is this ground circuit. 22 is this switch
20 couplers are accommodated near the switch 20.

In the conventional device configured as described above, if the main key switch 20 is turned off or the key is removed, the normally closed contact 20a grounds the charged end of the capacitor 10b, and thus the CDI device does not operate. And the engine does not start.

On the other hand, in vehicles such as motorcycles, the main key switch
If the wiring of 20 or the coupler 22 is disconnected, the charged end of the capacitor 10b can be disconnected from the ground. For this reason, the engine can be started by cutting the wiring or disconnecting the coupler 22 at the position indicated by the mark → in FIG. 3, and there is a problem that the vehicle anti-theft function is reduced.

(Object of the Invention) The present invention has been made in view of such circumstances,
An object of the present invention is to provide an anti-theft device for a vehicle in which when a CDI device is used, an engine cannot be started even if a wire near a main key switch is cut, so that the vehicle is hardly stolen.

According to the present invention, an AC output of a charging coil is rectified by a diode to charge a capacitor, and this capacitor is ignited by an ignition pulse output from a pulsar coil and a primary coil of an ignition coil. Discharge through the side and
A vehicle anti-theft device applied to a vehicle having a capacitor discharge ignition unit that generates a spark in an ignition plug by a high voltage induced on the secondary side of the ignition coil in accordance with the interruption of the primary current of the ignition coil A grounding circuit for grounding a charging end of the capacitor via a normally closed contact provided on a main key switch, and a grounding side of the charging end of the capacitor on the ground side of the normally closed contact via the SCR near the main key switch. The anti-theft device for a vehicle, comprising: a discharge circuit connected to the vehicle.

The same purpose is to rectify the AC output of the charging coil with a diode to charge the capacitor, and discharge this capacitor through the SCR fired by the ignition pulse output from the pulsar coil and the primary side of the ignition coil. A theft prevention system for a vehicle, which is applied to a vehicle having a capacitor discharge type ignition unit for generating a spark in a spark plug by a high voltage induced on a secondary side of the ignition coil due to an interruption of a primary current of the ignition coil. In the device, the charging end of the capacitor is grounded via a normally closed contact provided on a main key switch, and is excited by a load current supplied from a battery via a normally open contact provided on the main key switch. An electromagnetic relay that opens another normally closed circuit, and another ground circuit that grounds the charging end through the other normally closed contact. Anti-theft device that is achieved by.

(Embodiment) FIGS. 1 and 2 are circuit diagrams showing different embodiments of the present invention.

In the embodiment of FIG. 1, the anode of the SCR 10c is connected to the charging end of the capacitor 10b in the circuit of FIG.
The discharge circuit A is configured by connecting the cathode K of the CR 10c to the ground side of the normally closed contact 20a near the main key switch 20. Here, if the discharge circuit A is connected to the ground side of the normally closed contact 20a in the coupler 22A as shown by a solid line,
By cutting the wiring at the position indicated by the mark, the discharge circuit A is turned off, and the cathode K of the SCR 10c is not grounded, and the ignition circuit does not operate. That is, the engine does not start and the anti-theft function occurs.

The discharge circuit A is connected to the coupler 22 as indicated by a virtual line in the figure.
It may be extended to the inside of the case of the main key switch 20 through A and grounded. In this case, the discharge circuit A is turned off when the coupler 22A is disconnected. Also, when the discharge circuit A is cut off at the position indicated by the mark including the imaginary line between the main key switch 20 and the coupler 22A, the ignition circuit becomes inactive. Also, since the discharge circuit A uses the ground line of the ground circuit G, the number of connection wires of the main key switch is three compared to the case where the ground circuit and the discharge circuit are provided separately and independently. That is, the number of wirings is reduced.

In the embodiment of FIG. 2, another grounding circuit C for grounding the charged end of the capacitor 10b is indirectly connected via an electromagnetic relay 24 which is connected and disconnected by a main key switch 20C. That is, the charging end of the capacitor 10b is connected to the relay 2
4 while being grounded via the normally closed contact 24a, the positive electrode of the battery 26 is guided to the load 28 via the normally open contact 20b of the main key switch 20C, and the relay 24 is connected from the battery 26 via the main key switch 20C. An exciting current is supplied to the exciting coil 24b. Here, the normally closed contact 24a is connected to the main key switch 20C.
D connecting the battery 26 and the load 28 through the normally open contact 20b
Intermittent by.

Therefore, according to this embodiment, the main key switch 20C
Is turned on, the normally closed contact 20a opens, while the normally open contact 2a opens.
When 0b is closed, the coil 24b of the relay 24 is excited, and the normally closed contact 20a is opened. Therefore, the other grounding circuit C of the charging end of the capacitor 10b is opened, and the ignition is enabled. When the main key switch 20C is turned off, the normally closed contacts 20a and 24a are both closed, so that the charged end of the capacitor 10b is grounded, and the ignition circuit is deactivated. If the position indicated by the mark → around the main key switch 20C is cut off or the coupler 22C is cut off, the circuit D of the load 28 is released from the power supply 26,
The 24 normally closed contacts 24a remain closed. Therefore, the charged end of the capacitor 10b is grounded by another grounding circuit C,
The ignition circuit is inoperative. Also coupler 22C
, Even if the wiring of the ground circuit G is selectively cut off, because there is another ground circuit C having the normally closed contact 24a,
The ignition circuit is deactivated.

In each of the above embodiments, the contacts of the main key switches 20, 20C are connected to the CDI unit 10 via the couplers 22A, 22C, but the present invention directly connects the main key switch and the CDI unit without using a coupler. May be connected.

(Effect of the Invention) As described above, according to the invention of claim (1) of the present invention, the grounding circuit for grounding the charging end of the capacitor of the CDI unit via the normally closed contact provided on the main key switch, and the charging of the capacitor Since the end is provided with a discharge circuit connected near the main key switch on the ground side of the normally closed contact via the SCR, disconnecting the wiring near the main key switch
The CDI unit becomes inactive and the engine cannot start. Here, since the discharge circuit uses the ground wire on the ground side of the normally closed contact of the ground circuit, the number of wires is reduced.

According to a second aspect of the present invention, there is provided an electromagnetic relay which is energized by a load current supplied from a battery via a normally open contact provided on a main key switch and opens another normally closed contact, and further comprises closing the charging end with the other normally closed contact. Since there is provided another grounding circuit that is grounded through the contacts, if the wiring near the main key switch is cut, the capacitor will not be charged, the CDI unit will not operate, and the vehicle can be prevented from being stolen. Further, since the electromagnetic relay is excited by the load current, the wiring can be simplified using the circuit of the load current. Further, in the invention of claim (1), the engine is started if the ground circuit G is selectively cut off. However, according to the invention of claim (2), only the ground circuit (G) is selected in this way. As long as the load current is not supplied, the engine will not start even if the load is turned off, and the anti-theft effect will increase.

[Brief description of the drawings]

FIGS. 1 and 2 are circuit diagrams showing different embodiments of the present invention. FIG. 3 is a circuit diagram of a conventional device. 10: CDI unit, 10b: Capacitor, 20, 20C: Main key switch, 20a: Normally closed contact, 24: Electromagnetic relay, 24a: Other normally closed contact, G: Grounding circuit, A: ... discharge circuit, C ... other grounding circuit.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Kunio Kajiwara 2500 Shinkai, Iwata City, Shizuoka Prefecture Inside Yamaha Motor Co., Ltd. (56) Reference Reference (JP, U) Special Table 63-500160 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F02P 11/04 F02P 3/06 B60R 25/04

Claims (2)

(57) [Claims] An AC output of a charging coil is rectified by a diode to charge a capacitor, and the capacitor is discharged through an SCR fired by an ignition pulse output from a pulsar coil and a primary side of an ignition coil. In a vehicular anti-theft device applied to a vehicle having a capacitor discharge ignition unit that generates a spark in an ignition plug by a high voltage induced on a secondary side of the ignition coil in accordance with an interruption of a primary current of the ignition coil. A grounding circuit for grounding the charging end of the capacitor via a normally closed contact provided on the main key switch; and a grounding circuit for connecting the charging end of the capacitor to the ground side of the normally closed contact via the SCR near the main key switch. A vehicle anti-theft device comprising a connected discharge circuit. 2. An AC output of a charging coil is rectified by a diode to charge a capacitor, and the capacitor is discharged through an SCR fired by an ignition pulse output from a pulsar coil and a primary side of an ignition coil. In a vehicular anti-theft device applied to a vehicle having a capacitor discharge ignition unit that generates a spark in an ignition plug by a high voltage induced on a secondary side of the ignition coil in accordance with an interruption of a primary current of the ignition coil. A grounding circuit for grounding the charging end of the capacitor via a normally closed contact provided on the main key switch; and a grounding circuit which is excited by a load current supplied from a battery via a normally open contact provided on the main key switch, and other components. A vehicle comprising: an electromagnetic relay that opens a normally closed contact; and another ground circuit that grounds the charging end through the another normally closed contact. Anti-theft device.