JP3091455B1 - Ignition device for internal combustion engine - Google Patents

Abstract

An ignition device for an internal combustion engine using an ignition coil unit having a built-in current interruption type ignition device, wherein a composite ignition device is easily realized without opening the ignition coil unit. SOLUTION: An ignition device 100 for an internal combustion engine using an ignition coil unit 13 incorporating a current interruption type ignition device 11.
, An additional current interruption type ignition device 21 and a CDI device 22 are arranged outside the ignition coil unit 13, and the additional current interruption type ignition device 21 interrupts the primary current of the ignition coil 12, and the ignition coil 12 In accordance with the timing at which the voltage is generated, the CDI ignition device 22 sends one of the ignition coils 12
A device that supplies discharge current to the secondary side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an ignition device for an internal combustion engine.

[0002]

2. Description of the Related Art As an ignition device for an internal combustion engine, a current interruption type ignition device such as a full transistor ignition device, a semi-transistor ignition device, a point type ignition device and the like, and a CDI ignition device (capacitor discharge type ignition device) are used. I have. The current interruption type ignition device generally has a long discharge time but a slow voltage rise. On the other hand, in the CDI ignition device, the voltage rises quickly but the discharge time is short. Therefore, conventionally, a composite ignition device has been proposed in which the voltage rises quickly and the discharge time is long by combining the two ignition devices.

[0003]

However, in recent years, there has been an increase in the type of ignition device for an internal combustion engine in which a current interruption type ignition device is enclosed in an ignition coil unit. It is difficult to realize a combined ignition system by adding a CDI ignition system to the internal current interruption type ignition system.

SUMMARY OF THE INVENTION It is an object of the present invention to easily realize a combined ignition device for an internal combustion engine using an ignition coil unit having a built-in current interruption type ignition device without opening the ignition coil unit. It is in.

[0005]

According to a first aspect of the present invention, there is provided an ignition device for an internal combustion engine using an ignition coil unit containing a current interruption type ignition device, wherein an additional current interruption is provided outside the ignition coil unit. An ignition device and a CDI ignition device are arranged, and a power supply circuit is provided for constantly conducting the current interruption type ignition device inside the ignition coil unit. The additional current interruption type ignition device is connected to a ground terminal of the ignition coil unit via a discharge wire. connected, CDI ignition device is also connected via a discharge line to a ground terminal of the ignition coil unit, the vehicle system
Control of the additional current interruption type ignition device by the
Accordingly , a discharge timing control circuit is provided for interrupting the primary current of the ignition coil and supplying a discharge current from the CDI ignition device to the primary side of the ignition coil at a timing when a high voltage is generated in the ignition coil. It was made.

[0006]

The additional current cutoff type ignition device cuts off the primary current of the ignition coil, thereby generating a primary high voltage which is a large back electromotive force on the primary side of the ignition coil, and further generating a primary high voltage on the secondary side of the ignition coil. A large secondary high voltage is generated to perform discharge at the spark plug.

In accordance with the timing of generating a high voltage in the ignition coil by the operation of the above-described additional current interruption type ignition device,
The discharge timing control circuit is activated, a discharge current is supplied from the CDI ignition device to the primary side of the ignition coil to generate a primary high voltage, and a secondary high voltage is further increased to the secondary side of the ignition coil to generate a secondary high voltage. Is discharged.

The above is constructed without opening the ignition coil unit, and by combining them,
With the spark plug, the discharge with a rapid rise of the voltage by the CDI ignition device can be realized in a long discharge time by the additional current interruption type ignition device.

[0009]

FIG. 1 is a circuit diagram showing an example of an ignition device for an internal combustion engine.

An internal combustion engine ignition device 100 shown in FIG. 1 is an example in which an ignition circuit 102 is retrofitted to an ignition circuit 101 mounted on a vehicle.

The ignition circuit 101 includes a current interrupt type ignition device 1
Coil unit 13 that incorporates 1 and ignition coil 12
And a battery 14 and a spark plug 15. The ignition coil unit 13 has a diode 16 in addition to the current interruption type ignition device 11 and the ignition coil 12, and is arranged corresponding to each cylinder of the internal combustion engine as a full transistor ignition device.

The ignition circuit 102 includes an ignition coil unit 1
3, an additional current interruption type ignition device 21 and a CDI ignition device 22 are arranged outside the ignition coil unit 3, and a power supply circuit 23 for constantly conducting the current interruption type ignition device 11 inside the ignition coil unit 13.
Is provided.

The power supply circuit 23 applies the voltage of the battery 14 to the current interrupting igniter 11 via the diode 24 and the resistor 25 so as to keep the current interrupting igniter 11 conductive. The resistor 25 limits the current supplied from the battery 14 to the current interrupt type ignition device 11.

The additional current interruption type ignition device 21 is connected to a ground terminal 13 A of the ignition coil unit 13 via a discharge wire 26. The additional current interruption type ignition device 21 is controlled by a vehicle control device (ECU) 17 to be turned on (conductive state) / off (non-conductive state).

The CDI ignition device 22 is also connected to the ground terminal 13A of the ignition coil unit 13 via the above-described discharge wire 26. The CDI ignition device 22 detects a high voltage generation timing of the ignition coil 12 due to the operation of the additional current interruption type ignition device 21, and discharges a discharge current from the CDI ignition device 22 to the primary side of the ignition coil 12 in accordance with this timing. Supply discharge timing control circuit (high voltage detection circuit) 22
A is provided.

The diode 24 in the power supply circuit 23
A diode 27 is provided between an intermediate portion of the resistor 25 and the ground terminal 13A of the ignition coil unit 13. The diode 27 is connected to the additional current interruption type ignition device 21.
When the high voltage is generated in the ignition coil 12 by the operation of the above, the primary high voltage of the ignition coil 12 is set to the base of the transistor so that the base potential of the transistor constituting the current interrupt type ignition device 11 becomes substantially equal to the emitter potential. Applied to
The breakage of the current interruption type ignition device 11 is prevented.

Hereinafter, the ignition operation of the ignition device 100 will be described. (1) The voltage of the battery 14 is changed to a diode 24 and a resistor 25.
Is applied to the current interruption type ignition device 11 via the control circuit, and the current interruption type ignition device 11 is always kept in a conductive state. In this state, when the vehicle control device 17 turns on the additional current interruption type ignition device 21, the ignition coil unit 13 (ignition coil 12, current interruption type ignition device 11) and the additional current interruption type ignition device 21 A passing primary current flows.

(2) Next, when the vehicle control device 17 turns off the additional current interrupt type ignition device 21, the primary current flowing through the ignition coil 12 of the ignition coil unit 13 is interrupted, and A primary high voltage based on a large back electromotive force is generated on the secondary side, and a secondary high voltage is further generated on the secondary side of the ignition coil 12, and the high voltage is transmitted to the ignition plug 15 to perform discharge.

(3) The additional current interruption type ignition device 21 is
(2) The primary current of the ignition coil 12 is cut off, and the discharge timing control circuit 22A detects the timing at which a high voltage is generated in the ignition coil 12. Supply. This discharge current is supplied to the ignition coil 12 through the diode 16 of the ignition coil unit 13 to generate a primary high voltage on the primary side of the ignition coil 12 and a larger secondary voltage on the secondary side of the ignition coil 12. A high voltage is generated, and the high voltage is transmitted to the spark plug 15 so as to overlap with the high voltage described in (2) above, and discharge occurs.

Therefore, according to the present embodiment, the following operations are provided. The additional current cut-off type ignition device 21 cuts off the primary current of the ignition coil 12 to generate a primary high voltage, which is a large back electromotive force, on the primary side of the ignition coil 12.
2 generates a higher secondary high voltage on the secondary side of the ignition plug 1
5 is performed.

The discharge timing control circuit 22A operates in accordance with the high voltage generation timing of the ignition coil 12 due to the operation of the above-described additional current interruption type ignition device 21, and the CD
A discharge current is supplied from the I ignition device 22 to the primary side of the ignition coil 12 to generate a primary high voltage, and a higher secondary high voltage is generated at the secondary side of the ignition coil 12 to perform discharge at the ignition plug 15. .

The above is constructed without opening the ignition coil unit 13, and by combining them, the ignition plug 15 is provided with the additional current interruption type ignition device 21.
, The discharge by the CDI ignition device 22 with a rapid rise in voltage can be realized.

The embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration of the present invention is not limited to this embodiment, and the design may be changed without departing from the gist of the present invention. The present invention is also included in the present invention. For example, the discharge timing control circuit according to the present invention may detect a timing at which the vehicle control device (ECU) turns off the additional current cutoff ignition device and regard this timing as a high voltage generation timing at the ignition coil. good.

[0024]

As described above, according to the present invention, in an ignition device for an internal combustion engine using an ignition coil unit having a built-in current interruption type ignition device, the ignition coil unit can be easily combined without opening the ignition coil unit. An ignition device can be realized.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an example of an ignition device for an internal combustion engine.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 ignition device for internal combustion engine 11 current interruption type ignition device 12 ignition coil 13 ignition coil unit 21 additional current interruption type ignition device 22 CDI ignition device 22A discharge timing control circuit 23 power supply circuit

Claims (1)

(57) [Claims] 1. An ignition device for an internal combustion engine using an ignition coil unit enclosing a current interruption type ignition device, wherein an additional current interruption type ignition device and a CDI ignition device are arranged outside the ignition coil unit. A power supply circuit is provided for constantly turning on the current interrupt type ignition device inside, the additional current interrupt type ignition device is connected to the ground terminal of the ignition coil unit via a discharge wire, and the CDI ignition device is also connected to the ground terminal of the ignition coil unit. It is connected via a discharge line, and controls the additional current interrupting ignition system by the vehicle control apparatus
And a discharge timing control circuit for supplying a discharge current from the CDI igniter to the primary side of the ignition coil at a timing when a high voltage is generated in the ignition coil. An ignition device for an internal combustion engine, comprising: