JP2002021691A - Ignition device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent incurring of an energy loss due to resistance of each of a distribution gap and a high-tension cord and to improve energy efficiency. SOLUTION: An ignition device 1 for an internal combustion engine is an ignition device for an internal combustion engine mounted on a vehicle as an option and provided in correspondence to each cylinder of an engine. The ignition device comprises ignition coils 6-9 having switching elements 6a-9a; a crank signal output means 40 rotated integrally with a crank shaft to output a crank signal; and an energizing signal control means 5 to decide discrimination of a cylinder and an ignition timing for the cylinder based on the crank signal, and distribute a communication signal S fed from a control unit 90 on the vehicle side to each cylinder and output distribution energizing signals S1-S4 to the switching element of an ignition coil corresponding to the cylinder by setting the distribution energizing signals at an ignition timing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition device for an internal combustion engine which is optionally mounted on a vehicle.

[0002]

2. Description of the Related Art FIG. 3 is a circuit diagram of a conventional ignition device for an internal combustion engine. As shown in the drawing, a conventional ignition device 100 for an internal combustion engine includes a switching element (power switch) 2.
a, an ignition coil 2 having a.
A resistor R is provided for each of the high tension cords wired from the distributor 4 to the ignition plugs 11, 12, 13, and 14 of each cylinder of the engine. Electric power is supplied to the ignition coil 2 from a battery power supply 91.

When an energizing signal S is sent from the control unit 90 on the vehicle side, the energizing signal S
When the power switch 2a opens and closes and the primary current flowing through the primary coil 21 of the ignition coil 2 is cut off, a high voltage is induced in the secondary coil 22. The high voltage induced in the secondary coil 22 is distributed by the distributor 4 to the ignition plugs 11 to 14 in each cylinder through the distribution gap 41 and the resistance R of the high tension cord, and the central electrode of the ignition plugs 11 to 14 A high-voltage spark is generated by being applied between the fuel cell and the side electrode, and the mixture in the cylinder (combustion chamber) is ignited.

[0004]

However, in the conventional ignition device 100 for an internal combustion engine described above, since the high voltage induced in the ignition coil 2 is distributed by the distributor 4,
Distribution gap 41 and each resistance R of high tension cord
Causes energy loss.

[0005] The present invention has been proposed in view of the above,
An object of the present invention is to provide an ignition device for an internal combustion engine that can eliminate energy loss due to a distribution gap and each resistance of a high tension cord and improve energy efficiency.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an ignition device for an internal combustion engine optionally mounted on a vehicle, comprising an ignition coil having a switching element provided for each cylinder of the engine. A crank signal output unit that outputs a crank signal by rotating together with the crankshaft, and determines a cylinder and determines an ignition timing for the cylinder based on the crank signal, and is sent from a control unit on the vehicle side. And an energizing signal control means for distributing the energizing signal to each cylinder and outputting the distributed energizing signal to a switching element of an ignition coil corresponding to the cylinder in accordance with the ignition timing.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a circuit diagram of an ignition device for an internal combustion engine according to the present invention. In the drawing, an ignition device 1 for an internal combustion engine according to the present invention is a device that is optionally attached to a vehicle, and includes ignition coils 6 provided for each cylinder of the engine.
7, 8, 9; crank signal output means 40 which rotates integrally with the crankshaft to output a crank signal; and energization signal S sent from a control unit 90 on the vehicle side. And energization signal control means 5 for outputting the signals to the ignition coils 6 to 9.

A battery 91 is connected to the above-mentioned ignition coils 6-9.
, And each of the ignition coils 6 to 9 has a power switch 6a to 9a.

In the present invention, it is not necessary to provide the ignition coil 2 in the conventional ignition device 100 for an internal combustion engine described above, but here, the base terminal of the power switch 2a is grounded and cannot be used.

The crank signal output means 40 in the present invention utilizes a crank signal detection function among the various functions of the distributor 4 of the conventional internal combustion engine ignition device 100 described above. Two types of crank signals, namely, a crank angle signal Sa and a cylinder discrimination signal Sb, are output according to the arrangement of the light passage holes formed along the outer edge.

The energization signal control means 5 is a microcomputer or an electronic circuit, and receives an energization signal S from the control unit 90, a crank angle signal Sa from the crank signal output means 40, and a cylinder discrimination signal Sb. The predetermined control is performed based on the signal of. That is, based on the crank angle signal Sa and the cylinder determination signal Sb, the determination of the cylinder and the ignition timing for the cylinder are determined.
As shown in FIG. 2, the energization signal S is distributed to each cylinder to generate distribution energization signals S1, S2, S3, and S4, and the distribution energization signals S1, S2, S3, and S4 are used as ignition timings. In addition, the ignition coil 6 corresponding to the cylinder
Output to the power switches 6a, 6b, 6c, 6d of 7, 8, 9

For example, if the ignition plug 11 is provided in the cylinder A, and if the energization signal control means 5 determines that the ignition timing of the cylinder A is reached, the energization signal control unit 5 directs the power to the power switch 6a in accordance with the ignition timing. The distribution energization signal S1 is output.

A high voltage is induced in the secondary coils of the ignition coils 6 to 9 by the input distribution energizing signals S1 to S4, and the high voltage is directly transmitted to the ignition plug 11 without passing through a high tension cord or a resistor. ~ 14.

As described above, in the embodiment of the present invention, the energization signal S is distributed and the distribution energization signals S1, S2, S3,
Since S4 is output to the ignition coils 6 to 9 of each cylinder, a high voltage does not pass through the distribution gap or each resistance of the high tension cord as in the related art, and therefore, energy loss is eliminated. Energy efficiency can be greatly improved.

[0016]

As described above, according to the ignition device for an internal combustion engine of the present invention, the energizing signal is distributed and the distributed energizing signal is output to the ignition coil of each cylinder.
As in the past, the high voltage does not pass through the distribution gap or the resistance of the high tension cord, and therefore,
Energy efficiency can be greatly improved by eliminating energy loss.

[Brief description of the drawings]

FIG. 1 is a circuit configuration diagram of an ignition device for an internal combustion engine of the present invention.

FIG. 2 is a diagram showing an energization signal and a distribution energization signal.

FIG. 3 is a circuit diagram of a conventional ignition device for an internal combustion engine.

[Explanation of symbols]

Reference Signs List 1 ignition device for internal combustion engine 2 ignition coil 21 primary coil 22 secondary coil 2a power switch (switching element) 4 distributor 5 energization signal control means 6, 7, 8, 9 ignition coil 6a, 6b, 6c, 6d power switch (switching) Element) 11, 12, 13, 14 Spark plug 40 Crank signal output means 90 Control unit 91 Battery

Claims (2)

[Claims] 1. An ignition device for an internal combustion engine optionally mounted on a vehicle, comprising: an ignition coil provided with a switching element corresponding to each cylinder of the engine; and a crank signal which rotates integrally with a crankshaft to output a crank signal. Output means, based on the crank signal, determines the cylinder and determines the ignition timing for that cylinder, distributes the energization signal sent from the vehicle-side control unit to each cylinder, and distributes the distribution energization signal. And an energization signal control means for outputting to a switching element of an ignition coil corresponding to the cylinder in accordance with the ignition timing. 2. The ignition device for an internal combustion engine according to claim 1, wherein said crank signal is a crank angle signal and a cylinder discrimination signal.