JPH0374577A - Burglary preventing device for vehicle - Google Patents

Abstract

PURPOSE:To heighten burglary preventing effect in a vehicle with a condenser discharge ignition system by operating an ignition switch to actuate a controlling element so as to switch a switching element off and making engine start up impossible so long as the short circuit of a condenser charging circuit is released. CONSTITUTION:The output current of a generator including an exciter coil 8 is charged into a condenser 17 in a CDI unit 5, and by discharging this electric charge, high voltage is generated to an ignition coil 18 so as to generate spark to an ignition plug 21. Such a device is provided with a lamp charging coil 26, and one end thereof is connected to the series circuit of a huse 28 and a battery 29, and a switch (forming a part of an ignition switch) 30 through a thyrister 27. The gate of a transistor Tr33, a controlling element, is connected to the circuit, connected to the battery 29 side, of the switch 30 through a resistor 32 in an engine stopping circuit 39, and the collector of the Tr33 is connected to the gate of a thyrister 37, a switching element.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vehicle anti-theft device that can be applied to vehicles that employ the CDIC capacitor discharge ignition (CDIC) method.

(Prior art) Among small vehicles, as illustrated in Fig. 4,
The CD1 method is normally used as the engine ignition method. That is, in this scooter 1, an ignition switch 3 is provided at the bottom of the handle 2, and a CDI unit (including an ignition coil) 5, which is integrated as a whole, is provided at the bottom of the seat 4. Then, a part of the engine unit 6 is equipped with a power generation fi (CDI)
A magneto) 7 is provided. An ignition circuit for this type of engine is shown in FIG. 2 (see Japanese Utility Model Publication No. 58-5099 for a similar technique).

In FIG. 2, reference numeral 8 denotes a generator coil, and alternating current power is induced by cutting the lines of magnetic force of a magnet (not shown) that rotates due to the operation of the engine. One end of the coil 8 is grounded to the vehicle body, forming a common circuit including various loads (not shown). A terminal 9 of the CDI unit 5 is connected to the other end of the coil 8. C.D.I.
A terminal 10 of the unit 5 is grounded to the vehicle body. Inside the CDI unit 5, as shown in the figure, there are diodes, 12.
13 and resistor +4. +5, thyristor 16, capacitor 17, and primary coil 19 of ignition coil 18
are connected as shown in Figure 5. A spark plug 2 is connected to the secondary coil 20 of the ignition coil 18.
1 is connected.

In this circuit, when AC power is induced in the coil 8 of the generator and the terminal 9 side is positive, the current flows from the diode 11 to the capacitor 17. The current flows through the primary coil +9 of the ignition coil 18 to the diode 13, the terminal 10, and the ground circuit. This charges the capacitor 17. At this time, the thyristor 16 has no gate voltage, so
It's off. Next, when the terminal 9 side becomes negative, the current flows from the ground circuit through the resistor +4°15 and the diode 12 to the terminal 9.
The current flows through the coil 8 from the resistor 14. Is
Since a voltage is applied to the gate of the thyristor 16, the thyristor 16 is turned on, and the charge accumulated in the capacitor 17 is transferred to the primary coil of the ignition coil 18 +
It is discharged through 9. As a result, a high voltage is induced in the secondary coil 20 of the ignition coil 18, and the spark plug 21 ignites.

In order to stop the engine in an ignition circuit that operates in this manner, the following circuit is provided. That is, a diode 22 and a stop switch 23 are connected in series between one end of the generator coil 8 and the ground circuit, and closing the stop switch 23 short-circuits the generator coil 8. . If the coil 8 is short-circuited in this way, no electromotive force is generated in the coil 8, so the capacitor 17 is not charged, and the ignition coil 18
will not work. The series circuit of the diode 22 and the stop switch 23 may be connected between the connection point of the diode 18 and the capacitor 17 and the ground.

The circuit explained above closes the stop switch 23 when stopping the engine, and the circuit starts the operation. This short-circuits the coil 8 of the machine. This is the opposite of a so-called open-type stop circuit, in which the contacts are opened when stopping the engine, such as with battery ignition, and the operating sensation is reversed. Therefore, it is conceivable to use an oven type in this CI)I point large method as well. This will be explained with reference to FIG. This circuit is provided with a thyristor 24 whose gate is short-circuited when the stop switch 23 is closed, and the thyristor 24 short-circuits the input side of the capacitor 17. 25 is a resistor for obtaining the gate potential. In this figure, the connection circuit of the thyristor 16 is the same as that in FIG. 2, so illustration thereof is omitted.

In this circuit, when the stop switch 23 is closed, the thyristor 24 is turned off because its gate is shorted to the ground circuit. If thyristor 24 is off, the function of thyristor 16 is not inhibited, so the engine continues to operate. When the stop switch 23 is opened, the resistor 25
Since the thyristor 16 is turned on, the capacitor 1
7 [is short-circuited and the engine stops. That is, in this circuit, contrary to the circuit shown in FIG. 2, the stop switch 23 is opened to stop the engine, which is a so-called open type. However, this circuit is also basically of a short-circuit type, and only the stop switch 23 has an oven-type configuration.

(9! The problem that Akira is trying to solve) The one shown in Figure 2 above is not completely protected against acts of theft. (If you remove the stop switch 23 installed at the 32nd position or disconnect the wire connected to the stop switch 23,
Since the engine can be started easily, this is a deficiency in terms of theft. On the other hand, in the circuit shown in FIG. 3, the switch connection of the engine stop circuit is reversed, and there is a problem that the conventional switch circuit cannot be used as is.

The present invention has been made in view of this point, and an object of the present invention is to provide a circuit that can improve the anti-theft performance by allowing the conventional circuit to be used as is.

t, iz) The present invention, as a means for solving the above problems, charges a capacitor 17 with the output current of a generator, and applies a high voltage to the ignition coil 18 using the discharged charge of the capacitor 17. In the vehicle, a switch 30 is provided to short-circuit the coil 8 of the generator, and a switching element (thyristor 37) is provided to short-circuit the charging circuit of the capacitor 17. A control element (1-run raster 33) that controls the operation of the switching element (thyristor 37) is connected to the +m terminal (gate), and the control element (transistor 33) is connected to the ignition switch (by integrating the switch 30). ) is configured so that it does not operate when not operated.

(Function) According to the present invention having such a configuration, by operating the ignition switch, the control element (transistor 33) is operated and the switching element (thyristor 3) is activated.
7) and the engine will not start unless the short-circuit in the charging circuit of the capacitor 17 is released. Therefore, even if the ignition switch circuit is disconnected, the engine cannot be started.

(Example) An example of the present invention will be described below with reference to FIG. In this circuit, a lamp charging coil 26 is used in addition to an exciter coil (exciter coil) 8. One end of this lamp charging coil 266 is connected to the vehicle body grounding circuit, and -,1 is connected to the fuse 2 through the thyristor 27.
8 and the battery 29, and a part of the switch 30. The switch 30 forms part of an ignition switch, but a general circuit is not shown.

This switch 30 has two engine-off modes (engine stop circuit) rOFF and two engine-on modes (
Running circuit) rONj is provided. This switch 30 has four connection parts as indicated by circles in the figure, one connected to the thyristor 27 and battery 29 side in the rONJ mode, and the other connected to the ground circuit in the rOFFj mode. There is a circuit. 31 is a cover interposed between the switch 30 and the wiring.

In addition to a direct-fi (DC) load (not shown), the circuit connected to the battery 29 (!111) is connected to the gate of a transistor 33 via a resistor 32.A Zener diode 34, a resistor 35, and a capacitor 36 are The collector of the transistor 33 is connected to the gate of the thyristor 37.The gate is also connected to one end of the coil 8 via the resistor 38.With this connection, the transistor 33 is connected to the gate of the thyristor 37. Thyristor 37
The circuit including the thyristor 37, which functions as a control element for the engine, forms an engine stop circuit 39 and has a stopping effect on the CDI unit 5. The CDI unit 5 is exactly the same as that shown in FIG. In the figure, 40 is a lamp changeover switch, 41 is a lamp, and 42 is a resistor having a resistance value equivalent to the lamp.

In this device configured in this way, when the engine of the vehicle is stopped and the vehicle is left, the switch 30 is turned to r.
OFFj to short-circuit the coil 8. As a result, the capacitor 17 is not charged, the engine is not started, and therefore the anti-theft effect can be improved. When starting the engine for boarding, the switch 30 is set to rONj mode. In this way, the voltage from the battery 29 is applied to the base of the transistor 33, and the transistor 33 is turned on, so the thyristor 37 is turned off, and the function of the CDI unit 5 is not affected by ←I.

6. If the switch 30 is disconnected from the cover 3I for the purpose of theft, the 5 coil 8 will not be short-circuited, so the function of the CDI unit 5 will not be hindered. Since transistor 33 cannot supply I! control and stay off. Therefore, the thyristor 37 is turned on when a voltage is induced in the five coils 8, and the charging circuit of the capacitor 17 is short-circuited. Therefore, even if a voltage is induced in the coil 8 of the generator by pushing the vehicle, the CDI unit 5 will not function and the engine will not be able to start.

(Effects of the Invention) Since the present invention is a vehicle anti-theft device configured as described above, it is possible to form one engine stop circuit and a running @road without making any changes to the conventional CD11591 circuit. can. By providing two systems for engine levitation and running, it is possible to prevent the engine from starting even if the switch circuit is disconnected. By having two systems for engine stop and running, it becomes difficult to modify this circuit, and a great anti-theft effect can be achieved.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of an embodiment of the present invention. Fig. 2 is a circuit diagram of a conventional circuit. Fig. 3 is a circuit diagram of an improved version of the circuit shown in Fig. 2. Fig. 4 is a side view showing an example of a vehicle. It is a diagram. 5 - CDI unit 8 - Coil 16, 37 - Thyristor I7 - Capacitor special I8 - Ignition coil 21 - Spark plug 29 - Battery 30 - Switch 33 - Transistor

Claims (1)

[Claims] (1) In a vehicle in which a capacitor is charged with the output current of a generator and a high voltage is generated in an ignition coil by the discharged charge of the capacitor, a switch is provided to short-circuit the coil of the generator, and a switch is provided to short-circuit the coil of the generator. A switching element for short-circuiting a charging circuit is provided, a control element for controlling the operation of the switching element is connected to a control terminal of the switching element, and the control element is configured not to operate when the ignition switch is not operated. Characteristic anti-theft device for vehicles.