JPH094552A - Capacitor charge/discharge type ignition device - Google Patents

Abstract

PURPOSE: To prevent the ignition and the theft when a terminal of an ignition key is broken by using an ignition key in which the power is directly supplied from a main contact of a switch, and the power is connected to a brake control through a resistor. CONSTITUTION: When an ignition key 12 is turned ON, the voltage from a power supply 11 is directly inputted from an ON terminal, and after the voltage is divided by resistors R1 -R3 , the voltages V1 , V2 are respectively inputted in comparators U1 , U2 . The voltage inputted from an OFF terminal through a resistor Rk is divided by resistors Rk , R7 , and the voltage V3 is inputted in the comparator U1 , U2 . In the case of V1 >V3 or V2 <V3 , the output of the logic ICU3 is LOW and the condition of the ignition key is judged normal. A block 20 compares the output of a block 19 by the logic ICU4 to operate a transistor Q4 . When required, the output of U3 becomes High, and the transistor Q4 is operated to be in the misfire condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition device configured to ignite only when an ignition key operates correctly.

[0002]

2. Description of the Related Art A conventional capacitor charging / discharging ignition device is constructed as shown in FIG.
Even if there is no key, power is supplied to the device by short-circuiting both ends of the ignition key with electric wires, the ignition device operates, and there is a problem such as theft.

[0003]

[Object of the invention]

(2) The present invention short-circuits the terminals of the ignition key,
Alternatively, the purpose of the present invention is to prevent theft by preventing the ignition operation when it is opened or damaged.

[0004]

FIG. 2 shows an embodiment of the present invention, in which 11 is a DC power supply for circuit operation, 12 is a switch having a make contact and a break contact, and an ignition switch having a resistor connected in parallel to the break contact. Keys, 13 are IGN coils for igniting the engine, 14 are pulser coils for detecting ignition timing, 15 is an overvoltage detection circuit for stopping switching of the switching element Q1 when the ignition capacitor C2 is overcharged, Reference numeral 16 is a switching circuit for charging the ignition capacitor C2 during normal operation, and 17 is a control circuit for controlling the circuits 15 to 16 and detecting the pulsar timing to activate the ignition thyristor S1. is there. Reference numeral 18 is a circuit for inputting the state of the break contact when the make contact is operating. 19 is a circuit for inspecting the state of the make contact and the break contact when the make contact is operating. 20 is the power supply when the make contact is operating. It is a circuit that determines the circuit status of 19 only when and determines whether to ignite. Reference numeral 21 is a basic circuit of the ignition device.

With the above-described structure, first, in the basic portion 21 of the ignition device, the ignition key 12 is turned on, the power source 11 is input, and then the control circuit 17 causes the switching circuit 16 to switch the switching element Q1. Switching,
The ignition capacitor C2 is charged through the transformer T1.

At this time, when the ignition capacitor C2 reaches the specified voltage, the overvoltage detection circuit 15 operates and the switching of the switching element Q1 is stopped through the control circuit 17.

Next, when the engine starts to rotate, the ignition signal is input from the pulsar coil 14 to the control circuit (3), and the ignition thyristor S1 is ignited.
The energy of the ignition capacitor C2 is transferred to the IGN coil 13
To discharge and ignite the engine.

The ignition key is for determining whether the ignition device is supplied with power to operate it. The ignition key used in this device is O as shown in FIG.
When FF, it becomes the B contact side (conduction between A and B contacts, open between A and C contacts), and when ON, A contact side (conduction between A and C contacts, A
~ B contact open).

A resistor Rk is connected between C and B on the B contact side.

When the above ignition key 12 is turned on, the power supply 11 is directly supplied with power from the ON terminal, and O
Power is input from the FF terminal through the resistor Rk. O
The voltage from the N terminal is divided by resistors R1, R2 and R3,
The V1 and V2 voltages enter the input terminals of the comparators U1 and U2.

The voltage from the OFF terminal is divided by the resistors Rk and R7 through the transistor Q3, and the V3 voltage enters the other input terminal of the comparators U1 and U2.

As a result, V1> V3 or V2 <V
When it is 3, the output of the logic ICU 3 is LOW, and it is determined that the ignition key is in the normal state.

Next, the block 20 compares the output of the block 19 (output of U3) by the logic ICU 4 when the ON terminal has a voltage, and operates the transistor Q4 to activate the transistor Q4.
When 1 is turned off, it is determined whether the converter operation is stopped and the ignition capacitor C2 is not charged.

This is because the power can be intermittently supplied when the battery of the power source 11 is removed and only the generator output is generated, and is configured only when the voltage can be secured at the ON terminal. (4)

Next, the condition under which Transis Q4 operates, that is, the misfire condition is, for example, when the ignition key is shorted or opened with an electric wire from an external terminal. As shown in FIG. 4, the output of U3 becomes High and Transis Q4 Operates and goes into misfire. From the above, the ignition
Ignition cannot be performed except when the key is not activated, and theft can be prevented.

[0016]

EFFECTS OF THE INVENTION Except when the ignition key does not operate normally except when the ignition key terminal is short-circuited or is broken in the open state, the ignition operation cannot be performed and theft can be prevented. It will be possible. The present invention can be applied to an ignition device such as a two-wheeled vehicle.

[Brief description of drawings]

FIG. 1 is a conventional example of a capacitor charging / discharging ignition device.

FIG. 2 is an embodiment of the present invention of a capacitor charge / discharge type ignition device having an anti-theft function.

FIG. 3 is a block diagram of an ignition key used in the present invention.

[Figure 4] Ignition key judgment table

[Explanation of symbols]

11 DC power supply for circuit operation 12 Ignition key 13 IGN coil for ignition 14 Pulser coil for detecting ignition timing 15 Overvoltage detection circuit for stopping switching of Q1 when the capacitor C2 for ignition is overcharged ( 5) 16 A switching circuit for charging the ignition capacitor C2 during normal operation 17 A control circuit for controlling the circuits of 15 to 16 and detecting the pulser timing to activate the ignition thyristor S1. Circuit for inputting the state of the B contact when the A contact is operating 19 Circuit for inspecting the state of the A contact and the B contact when operating the A contact 20 Only when the A contact is operating and the power is input 19
21 Basic circuit of ignition device S1 Ignition thyristor C2 Ignition capacitor T1 Transformer Q1 Primary side switching element of transformer T1 Power supply smoothing capacitor D1, D2, D3 Rectification Diodes Q2, Q3, Q4 Transistors R1 to R9 Resistors U1, U2 Comparators U3, U4 Logic ICs

Claims (3)

[Claims] 1. A power supply is directly supplied from a make contact through a switch having a make contact and a break contact,
A capacitor charging / discharging type ignition device characterized in that an ignition key configured to connect from a break contact through a resistor is used. 2. A circuit for detecting the voltage difference between the make and break contacts when the key is turned on, and the voltage level of the make and break contacts are determined using the ignition key,
It has a circuit to check the resistance in the key,
The capacitor charging / discharging ignition device according to claim 1, wherein ignition is not performed when the operation of the key is abnormal. 3. The capacitor charging / discharging type ignition device according to claim 2, further comprising a circuit for judging an abnormal operation of the ignition key only when power is input. Ignition device.