JPS62243968A - Contactless ignition device for internal combustion engine - Google Patents

Abstract

PURPOSE:To allow an almost fixed current to flow in a choke coil, by providing an ignition capacitor, which is charged with transient voltage generated in a coil element, and an electric discharge circuit which allows an electric charge of the ignition capacitor to flow in an ignition coil in the ignition time. CONSTITUTION:A choke coil 9 forming a coil element is connected with an output end of a generator 1 or with a battery 14. An ignition capacitor 11 is charged with transient voltage generated in the coil element 9. An electric charge of the ignition capacitor 11 is allowed to flow in an ignition coil 12 in a discharge circuit 11, 18, 12 in the ignition time. An output from the battery 14 is supplied to the choke coil 9, and conduction of a current, supplied to the choke coil 9, is controlled by a signal synchronized with the output of the generator 1. In this way, an almost fixed current is allowed to flow in the choke coil, and the output of the generator can be effectively supplied to a DC power source.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a non-contact ignition device for an internal combustion engine that utilizes an alternating current generator.

[Conventional technology]

In the conventional method, as shown in Japanese Patent Application Laid-open No. 59-226275, the output of the lamp coil is passed through a choke coil, and when the output of the lamp coil falls of the sine wave, the transistor is turned off and the output is sent to the choke coil. The flowing current is cut off and the voltage generated in this choke coil is charged to the ignition capacitor. Then, depending on the ignition timing, the SIRISK is made conductive, the charge in the ignition capacitor flows through the primary coil of the ignition coil, and a high voltage is induced in the spark plug.

[Problem that the invention seeks to solve]

Normally, the energy that contributes to ignition out of the generator's output is small, but in the conventional generator described above, the timing to turn off the transistor that cuts off the current flowing to the choke coil is determined by the lamp. Since it is performed when the sine wave that is the output of the coil falls (after the peak value of the output), more than half of the electrical output always contributes to ignition, and the amount of electrical output extracted is extremely large. In addition, there is a problem in that the current flowing through the choke coil changes depending on the magnitude of the load on the lamp coil, and the voltage of the charging capacitor changes widely.

[Means for solving problems]

Therefore, the present invention provides a coil element (9) connected to the output end of the generator (1) or the battery Qa, and a first coil element that is electrically connected by the output of the generator and supplies the output of the puffer to the coil element. Semiconductor switching element (15, 3
5); and a second semiconductor switching element αe that bypasses current from the generator to the control pole of the first semiconductor switching element when the output of the generator is equal to or higher than a predetermined value; An ignition capacitor αυ is charged with a transient voltage generated in the coil element when the first semiconductor switching element is cut off due to conduction of the semiconductor switching element, and the charged charge of the ignition capacitor is ignited at the ignition timing. A non-contact ignition device for an internal combustion engine is provided with: a discharge circuit (11, 18, 12) that causes a flow to flow through a coil (2);

[Effect]

The output from the DC power source was supplied to the choke coil, a current was supplied to the choke coil, and conduction of the current was controlled by a signal synchronized with the output of the generator.

〔Effect of the invention〕

As described above, the current flowing through the choke coil is a DC current output, which is approximately constant, and has the excellent effect that the output of the generator can be effectively supplied to the DC power source.

〔Example〕

The present invention will be described below with reference to embodiments shown in the drawings.

In the first embodiment shown in FIG. 1, 1 is an output coil of a magnetic generator, 2 is a rectifier for rectifying the output of the output coil 1, and has diodes 3a to 3d.

35.15 is a first semiconductor switching element. The second transistors 4 and 26 are low resistors, and one end of the output coil 1 is connected to the base of the first transistor 6 via a resistor 4.

9 is a choke coil connected between the emitter of the second transistor 15 and the ground, 10 is a diode, and 11 is a charging capacitor, and the primary coil 12a of the ignition coil 12 is connected to one end of this charging capacitor 11. ing. Further, the secondary coil 12b of the ignition coil 12a is grounded via the spark plug 13.

Reference numeral 18 denotes an ignition syrisk whose cathode and anode are connected to one end of the primary coil 12a of the ignition coil 12 and the ground, respectively, and the gate side is connected to the sensor coil 19.
is connected to one end of the sensor coil 19 and the other end of the sensor coil 19 via a resistor 21.

16 is a third transistor forming a second semiconductor switching element, and the collector of the third transistor 16 is connected between the resistor 4 and the base of the first transistor 35, and the emitter is connected to ground through a diode 20. It is connected. Further, a connection point between a resistor 22 and a resistor 23 which is voltage-divided from the end of the output coil 1 is connected to the base.

Next, the operation of the above configuration will be explained.

Due to the output of the output coil 1 in the direction of the arrow, the diode 3d-
The first transistor 35 is made conductive by the coil 1 - resistor 4, 5 - resistance 26 of the first transistor 35 - ground circuit, so that the battery 14 - the first transistor 35 is connected.
Collector and emitter of the first transistor 15 - base of the second transistor 15 - choke coil 9 - ground. The second transistor 35.15 is turned on. As a result, a current flows through the circuit from the battery 14 to the second transistor 15 and the choke coil 9.

Then, when the current in the output coil 1 exceeds a predetermined value, the divided voltage between the resistor 23 and the resistor 22 is applied to the base of the third transistor 16, and the coil 1 - resistor 23 → third
A current flows to the base of the transistor 16, the third transistor 16 becomes conductive, the base current of the first transistor 35 is bypassed, and the second transistor 15 becomes non-conductive, cutting off the current.

Then, the current flowing through the choke coil 9 is cut off, and an induced voltage is generated in the choke coil 9. This voltage is transferred to the ignition capacitor 11 by the circuit of the choke coil 9 → ignition capacitor 11 - diode 10 and the waveform of the output coil 1. synchronize with and perform multiple charging. When the ignition timing comes, the output generated in the sensor coil 19 discharges the charge in the ignition capacitor 11 to the circuit of the ignition cyrisk 18 and the primary coil 12a of the ignition coil 12, and the ignition coil 1
A high voltage is generated in the secondary coil 12b of No. 2, and the plug 31
Get the ignition spark.

Further, the output of the output coil l is transmitted through the second transistor 15.
When the power is cut off, the battery 14 is charged.

In the second embodiment shown in FIG. 2, the base of a transistor 15 is connected to one end of the output coil 1 via a resistor 4. The collector of the transistor 15 is connected to the choke coil 9, and the emitter is connected to ground via a low resistance 22. Also, thyristor 5
0 has an anode connected to the base of the transistor 15, a gate connected between the resistor 22 and the emitter of the transistor 15, and a cathode connected to the ground.

Next, the operation of the main parts in the second embodiment will be described. The output of the output coil 1 causes the transistor 15 to conduct through the resistor 4. Then, from the battery 14, the choke coil 9. The collector and emitter of transistor 15,
Current flows through the circuit of resistor 22.

Then, when the output of the output coil 1 increases and the voltage applied to the resistor 22 (the output of the battery 14 and the output of the output coil 1) becomes a predetermined value or more, the gate of the Cyrisk 50 becomes conductive, turning on the Cyrisk 50, The base current of transistor 15 is bypassed.

Then, the current flowing from the choke coil 9 to the transistor 15 is cut off, and the induced voltage generated in the choke coil 9 is charged to the ignition capacitor 11 via the diode 10.

Note that the connection terminal B of the main current circuit may be connected to A' instead of A.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram showing a first embodiment of a non-contact ignition device for an internal combustion engine according to the present invention, and FIG. 2 is an electric circuit diagram showing a second embodiment of a non-contact ignition device for an internal combustion engine according to the present invention. ■... Output coil of magnetic generator, 2... Rectifier. 35.15 . . . 1st configuring the first semiconductor switching element. Second transistor, 9... Choke coil forming a coil element, 11... Ignition capacitor, 1
2...Ignition coil, 14...Battery, 16...
A third transistor constituting the λth semiconductor switching element, 18... ignition thyristor.

Claims (1)

[Claims] A coil element (9) connected to an output end of a generator (1) or a battery (14) is electrically connected by the output of the generator, and the output of the battery is supplied to the coil element. a first semiconductor switching element (15, 35); and a second semiconductor that bypasses current from the generator to the control pole of the first semiconductor switching element when the output of the generator is equal to or higher than a predetermined value. a switching element (16); and an ignition capacitor (11) that is charged with a transient voltage generated in the coil element when the first semiconductor switching element is cut off due to conduction between the second semiconductor switching element; A non-contact ignition device for an internal combustion engine, comprising: a discharge circuit (11, 18, 12) for flowing the charged charge of the ignition capacitor to an ignition coil (12) at the ignition timing.