JPS5823014Y2 - Ignition system for battery-powered internal combustion engines - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ignition device for a battery-equipped internal combustion engine, and an object thereof is to obtain an ignition device for a battery-equipped internal combustion engine that performs reliable ignition operation.

Currently, ignition systems for internal combustion engines are in the form of so-called high-voltage magnet generators that utilize the rotational movement of the internal combustion engine for various reasons to generate an induced voltage using the magnetic force of a permanent magnet, and use this induced voltage as a power source. There are almost no ignition devices that use batteries as a power source.

However, although the scope of use is limited, there is a real need for an ignition system for internal combustion engines equipped with a battery, and it is therefore desirable to develop an ignition system for internal combustion engines equipped with a battery that operates reliably and stably. ing.

Conventionally, this type of ignition system for internal combustion engines with a battery has existed, but in addition to the drawback of unstable operation, it is difficult to use a non-contact type ignition system that uses semiconductors. However, it is difficult to control the turn-off and on-state of each semiconductor element, and reliable operation cannot be obtained.

This is because since the power source is a direct current, turning off a semiconductor element once turned on is troublesome and tends to be uncertain.

As mentioned above, the present invention was devised to eliminate the shortcomings of the battery set ignition device, which has concerns about operational stability, and to enable stable and reliable ignition operation. Examples will be described according to the drawings.

The ignition device for a battery-equipped internal combustion engine according to the present invention has a resistor R4 connected in parallel with a series circuit of a batch IJ-E as a DC power source and a switch S, and a resistor R1, a transistor circuit TrC1, a capacitor C, and a diode D2. A series circuit consisting of a resistor R2 having a high resistance value and a thyristor SCR whose gate circuit is constituted by a trigger coil TG, and a primary winding TI of an ignition coil T with a plug P connected to the secondary winding T2. and a transistor circuit TrC2, the emitter of the transistor circuit TrC1 is connected to the base of the transistor circuit TrC2 via a resistor R3 serving as a base resistance, and the base of the transistor circuit TrC1 is connected to the anode of the thyristor SCR. Furthermore, the positive pole of the capacitor C, that is, the emitter of the transistor circuit TrCx, is connected to the anode of the thyristor SCR via the diode D1.

In addition, in the illustrated embodiment, both transistor circuits TrC
1, TrC2 is a Darlington circuit, but it is also possible to use one power transistor each.

In addition, the capacitor C is used to keep the thyristor SCR turned on, and the parallel circuit of the resistor R4 and the diode D2 inserted between the negative electrode of the capacitor C turns on the diode when the capacitor C is charged. D
2, and when the capacitor C is discharging, the resistor R4
This is to make it work.

Next, the operation of the device of the present invention having the above-mentioned configuration will be explained step by step.

When the switch S is turned on, current flows into the base of the transistor circuit TrC1 through the resistor R2, so the transistor circuit TrC1 is turned on.

When the transistor circuit TrC1 is turned on, a current flows into the base of the transistor circuit TrC2 through the transistor circuit TrC1 and the resistor R3, turning on the transistor circuit TrC2 and draining the battery E.
A charging circuit for the capacitor C is formed through the path of → switch S → transistor circuit TrC1 → capacitor C → diode D2 → batch IJ-E, and the capacitor C is charged with a predetermined amount of charge.

This charging of the capacitor C is carried out in an extremely short time.

When the transistor circuit TrC2 is turned on, a primary short-circuit current flows through the primary winding T1.

When the internal combustion engine is rotated from this state, a flywheel (not shown) rotates, and a trigger pulse is generated in the trigger coil TG by the action of a permanent magnet for trigger pulse generation attached to this flywheel, and a trigger pulse is generated in the thyristor S.
Trigger CR.

By turning on this thyristor SCR, the base of the transistor circuit T r C1 is dropped to negative voltage, so the transistor circuit T r C1tri is turned off and! Octopus transistor circuit Tr Transistor circuit Tr whose base current is cut off by turning off C1
C2 is also turned off, whereby the primary short-circuit current flowing through the primary winding TI is abruptly cut off, causing a spark discharge to occur in the plug P to perform an ignition operation.

Also, the turned-on thyristor SCR closes the discharge circuit of the capacitor C by the diode D1, so the thyristor SCR connects the capacitor C and the resistor R4.
The turn-on state will be maintained until the time constant determined by the capacitor C, that is, the discharge of the capacitor C is completed.

When the discharge of the capacitor C is completed, the thyristor SCR is turned off, and by turning off the thyristor SCR, the transistor circuit TrCx is returned to a state where it can be turned on. Therefore, it is turned on again by the base current flowing through the resistor R2. , repeat the ignition operation.

By the way, the discharge time of the capacitor C, that is, the values of the capacitor C and the resistor R4, are set in accordance with the rotational speed of the internal combustion engine, or more precisely, the rotational speed of the flywheel. Needless to say, the value is set to such a value that the discharge is completed with sufficient margin between the time when a pulse is generated and the time when the next trigger pulse is generated.

As described above, the device of the present invention uses the thyristor SCR to control the conduction of the transistor circuit TrCz that controls the interruption of the primary short-circuit current, and maintains the turn-on of the thyristor SCR by discharging the capacitor C.
When the discharge of the thyristor SCR is completed, the thyristor SCR is turned off and at the same time each transistor circuit TrC1+TrC2 is returned to a triggerable state, so the turn-on and turn-off operations of each semiconductor element are reliably performed, thereby ensuring reliable ignition operation. .

Further, the ignition time can be freely set by setting the discharge time of the capacitor C, and therefore a sufficient combustion time can be obtained.

As is clear from the above explanation, the ignition device for an internal combustion engine with a battery according to the present invention is the best because its ignition operation is stable and reliable, and various time settings can be easily and freely set. It has many excellent functions and effects, such as being able to obtain the ignition performance of 1, and has a relatively simple structure and is easy to implement.

[Brief explanation of the drawing]

The drawing is an electrical connection diagram showing an embodiment of the device of the present invention. Explanation of symbols: E...Battery, S...Switch. TrCl, TrC2...transistor circuit, T...
Ignition coil, TI...primary winding, T2...secondary winding, P...plug, SCR...thyristor, TG...
・Trigger coil, C...capacitor, Ri, R2>
R3>R4...Resistance, Dl, D2...Diode.

Claims (1)

[Scope of utility model registration request] In parallel with a series circuit of a battery E as a DC power source and a switch S, there is a series circuit of a resistor R1, a transistor circuit TrC1, a capacitor C, and a resistor R4 connected in parallel with a diode D2, and a resistor R2 having a high resistance value. A series circuit with a thyristor SCR having a trigger coil TG in the gate circuit, and a primary winding TI of an ignition coil T with a plug P connected to a secondary winding T2 and a transistor circuit Tr.
A series circuit with C2 is connected, and the transistor circuit T
The base of rC1 is connected to the anode of the thyristor SCR, the base of the transistor circuit TrC2 is connected to the emitter of the transistor circuit TrC1 via a resistor R3, and the positive pole of the capacitor C is connected to the anode of the transistor circuit TrC1 via a diode D1. An ignition device for an internal combustion engine with a battery set connected to the anode of a thyristor SCR.