JPH062642A - Electronic distribution igniter - Google Patents

Abstract

PURPOSE:To prevent any engine trouble from occurring by prohibiting the ignition of all cylinders inclusive of a cylinder in ignition order in the case where a cylinder ignition position signal performs such an output as making it so as to ignite the cylinder other than the ignition order. CONSTITUTION:A cylinder discrimination circuit 3 discriminates each cylinder by means of a reference position signal 1a out of a reference position detector 1 and an angle signal 2a out of an angle detector 2, outputting a reference cylinder signal 3a and respective cylinder signals 3b-3f. At a reference cylinder signal distribution circuit 5, the reference cylinder signal 3a is shifted successively after triggering a down of an ignition signal 4a out of an arithmetic unit 4, and each of ignition position signals 51a-56a is outputted according to the ignition order of each cylinder. In time of the first cylinder ignition, by way of example, the product of the ignition position signal 51a, reversal signals 52b-56b of these cylinder ignition position signals 52a-56a, the ignition signal 4a and a cylinder position signal 11a is adopted at an AND circuit 61, and a cylinder ignition signal 61 a or the result is outputted to a first cylinder ignition coil 71, thus any simultaneous ignition in plural cylinders is prevented from occurring.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to engine ignition control, and more particularly to failsafe of an electronic distribution ignition device in case of malfunction.

[0002]

2. Description of the Related Art Conventionally, an electronic distribution ignition device has a structure in which after detecting a cylinder serving as an ignition reference, a cylinder or the like is used to detect a cylinder in an ignition sequence and an ignition signal is distributed to each cylinder. Even if the counter malfunctions due to noise, etc., ignition of cylinders other than the ignition order is prevented. However, when the engine starts, etc.
When operating in normal rotation, if the signals of the cylinders that serve as the ignition reference are not input in the ignition order and the reference position signal and the ignition signal overlap, it is possible to ignite cylinders other than the reference ignition order. There was a nature.

As described above, Japanese Patent Application Laid-Open No. 63-27 is concerned with having an opportunity to ignite cylinders other than the ignition order.
There is No. 6259.

[0004]

In the conventional electronic distribution ignition device, the signals of the cylinders that serve as the ignition reference are not input in the order of ignition, and the reference position signal and the ignition signal overlap. In the case of not considering the distribution of ignition, the cylinders other than the ignition order are ignited,
For example, there is a possibility that the engine may malfunction due to ignition in the intake process.

[0005]

A reference position detector connected to a rotary shaft of an engine having a plurality of cylinders to detect the position of each cylinder, and an engine rotation connected to the rotary shaft of the engine like the reference position detector. An angle detector for detecting an angle, a cylinder signal generating means for discriminating the cylinder by the output signals from the reference position detector and the angle detector, and outputting a cylinder signal, an optimum ignition timing and an energization time to the ignition coil. Ignition signal output means for calculating and outputting an ignition signal, cylinder ignition position signal generation means for generating an ignition cylinder signal according to the ignition sequence based on the output signal from the reference cylinder signal generation means by the ignition signal, and the ignition A signal, a cylinder ignition position signal, and a cylinder signal are multiplied, and the ignition signal is supplied to the ignition coil of each cylinder. Add cylinder inverted ignition position signal obtained by inverting the cylinder ignition position signals other than.

[0006]

[Function] When the cylinder ignition position signal is output such that ignition is performed in a cylinder other than the ignition order, the cylinders in the ignition order are also included.
Preventing engine failure by prohibiting ignition of all cylinders.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram showing the structure of the present invention. In FIG. 1, a reference position signal 1a from a reference position detector 1 which is connected to the rotation shaft of an engine having a plurality of cylinders and detects the position of each cylinder, and the reference position detector 1 is connected to the rotation shaft of the engine similarly to the reference position signal 1a. The cylinder discriminating circuit 3 discriminates the cylinder based on the angle signal 2a from the angle detector 2 which detects the rotation angle of the engine.
a, 2-cylinder signal 3b, 3-cylinder signal 3c, 4-cylinder signal 3
The d, 5 cylinder signal 3e and the 6 cylinder signal 3f are output. In the reference cylinder signal distribution circuit 5, the reference cylinder signal 3a is sequentially shifted by using the fall of the ignition signal 4a output from the arithmetic unit 4 as a trigger, and the one cylinder ignition position signal 51a and the two cylinders ignition position signal 51a are shifted according to the ignition order of each cylinder. An ignition position signal 52a, a 3-cylinder ignition position signal 53a, a 4-cylinder ignition position signal 54a, a 5-cylinder ignition position signal 55a, and a 6-cylinder ignition position signal 56a are output. And each cylinder ignition position signal 51a-56a
The cylinder reversal ignition position signals 51b to 56b are output. In the AND circuits 61 to 66 provided for each cylinder, the cylinder signal of a predetermined cylinder and the cylinder reversal ignition position signal 5 of another cylinder are output.
The OR circuit 1 uses the book, the ignition signal 4a, and the cylinder signals 3a to 3f.
Ignition is performed by taking the logical product of the cylinder position signals 11a to 16a passed through 1 to 16 and outputting the ignition signals 61a to 66a of the cylinders to the ignition coils 71 to 76, respectively.

The detailed operation of the cylinder discrimination circuit 3 will now be described with reference to FIG.
Will be described with reference to FIG. The reference position signal 1a generates a pulse at a fixed angle before top dead center of each cylinder (for example, 110 ° before top dead center). Further, the angle signal 2a outputs a pulse according to the angle at which the engine rotates (for example, one pulse at an engine rotation angle of 2 °). At that time, the pulse width of the reference position signal 1a is set to be different depending on each cylinder. For example, in the first cylinder, the angle signal 2a has a pulse width of 24 pulses, and in the second cylinder, the angle is different. Signal 2a is 20
Pulse, 16 pulses for the third cylinder, 1 for the fourth cylinder
2 pulses, 5th cylinder has 8 pulses, 6th cylinder has 4
It has a pulse width for a pulse. The AND circuit 31 ANDs the two signals of the reference position signal 1a and the angle signal 2a, and the angle pulse counter 33 counts the number of pulses of the angle signal 2a within the pulse of the reference position signal 1a.
For example, in the first cylinder, when 24 pulses are counted, the reference cylinder signal 3a is output. With the above configuration, the 20-pulse signal 33b for the second cylinder, the 16-pulse signal 33c for the third cylinder, the 12-pulse signal 33d for the fourth cylinder, the 8-pulse signal 33e for the fifth cylinder, and the sixth cylinder. 4 pulse signal 3
Output 3f. Each signal 33a-3 output here
3f is configured to be cleared when the next pulse of the reference position signal 1a is generated. This cylinder signal 33
In the configuration for clearing a to 33f, the rising edge detection circuit 32 for detecting the rising edge of the reference position signal 1a causes several μ as shown in FIG. 3 when the reference position signal 1a rises.
A clear signal 32a having a short pulse width of s is output to clear the angle pulse counter. With the above configuration, each cylinder is discriminated by counting the pulse width of the reference position signal 1a and the number of pulses of the angle signal 2a therebetween. However, as shown in the time chart of FIG. 3, the reference cylinder signal 3
The pulse signals other than "a" are also output to other cylinders. Therefore, it is necessary to mask the signals in other cylinders. Two
To correct the 0 pulse signal 33b to the 2 cylinder signal 3b,
The AND circuit 3 calculates the product of the inverted signal of the reference cylinder signal 3a, the inverted signal of the reference position signal 1a, and the 20 pulse signal 33b.
Take 4 Similarly, the three-cylinder signal 3c is the inverted signal of the 20-pulse signal 33b and the inverted signal of the reference position signal 1a.
The AND circuit 35 takes the product of the pulse signals 33c. The 4-cylinder signal 3d is the product of the inverted signal of the 16-pulse signal 33c, the inverted signal of the reference position signal 1a, and the 12-pulse signal 33d.
The ND circuit 36 is used. The 5-cylinder signal 3e is the inverted signal of the 12-pulse signal 33d and the inverted signal of the reference position signal 1a.
The AND circuit 37 takes the product of the pulse signals 33e. The 6-cylinder signal 3f is the product of the inverted signal of the 8-pulse signal 33e, the inverted signal of the reference position signal 1a, and the 4-pulse signal 33f.
It is taken by the circuit 38. With the above configuration, signals for discriminating each cylinder are output.

In the prior art, for example, in the case of ignition of the third cylinder, a three cylinder ignition position signal 53a and an ignition signal 4a,
The product of the three-cylinder position signal 13a, which is originally the three-cylinder signal 3c, output from the OR circuit 13 is calculated by the three-cylinder AND circuit 6
By taking 3, the three-cylinder ignition signal 63a is output.
The same applies to the other cylinders.

The flip-flop 21 prevents the pulse width of the ignition signals 61a to 66a of each cylinder from becoming short when the ignition signal 4a and the reference position signal 1a overlap each other. AND the product of the reference position signal 1a and the ignition signal 4a
The circuit 20 detects the overlap. This AN
The output of the flip-flop 21 is set to "High" by using the rising edge of the overlap signal 20a, which is the output of the D circuit 20, as a trigger. This flip-flop output signal 21a
And the respective cylinder signals 3a to 3f are ORed by OR circuits 11 to 16
Thus, the cylinder position signals 11a to 16a are set to "High" to prevent the pulses of the ignition signals 61a to 66a of each cylinder from becoming short.

Conventionally, however, the reference position signal 1a for the first cylinder is continuously input when the engine rotation is forward, reverse, or forward, especially when the engine is started, as shown in FIG. there is a possibility. At this time, the reference cylinder signal 3a is continuously shifted by the reference cylinder distribution circuit 5, and the cylinder ignition position signals 51a to 56a are output as "High" in a plurality of cylinders. When the ignition signal 4a overlaps the reference position signal 1a, the cylinder position signals 11a to 16a are generated.
Are all "High", and the product of these signals is used to ignite multiple cylinders. This may cause a phenomenon such as ignition in the intake process or the like, which may lead to engine damage.

Therefore, as shown in FIG. 1, 1 to 6 cylinder ignition position signals 51a to 56a, ignition signal 4a and 1 to 6 cylinder signal 1
1-6 cylinder ignition signal 51a-in addition to the product of 1a-16a
1 to 6 cylinder reverse ignition position signals 51b to 56b, which are signals obtained by inverting 56a, are added. For example, in the case of the first cylinder, the one-cylinder ignition position signal 51 in the first cylinder AND circuit 61.
a, a 2-cylinder reverse ignition position signal 52b which is a signal obtained by inverting the 2-cylinder ignition position signal 52a, and a 3-cylinder reverse ignition position signal 5 which is a signal obtained by inverting the 3-cylinder ignition position signal 53a.
3b, a 4-cylinder reverse ignition position signal 54b, which is a signal obtained by inverting the 4-cylinder ignition position signal 54a, a 5-cylinder reverse ignition position signal 55b, which is a signal obtained by inverting the 5-cylinder ignition position signal 55a, and a 6-cylinder ignition position signal. 6cylinder reverse ignition position signal 56b, which is a signal obtained by inverting 56a, and ignition signal 4a.
Then, ignition is performed by taking the product of the 1 cylinder position signal 11a and outputting the resulting 1 cylinder ignition signal 61a to the 1st cylinder ignition coil 71. Similarly, for the other cylinders, the AND circuit calculates the product of the predetermined cylinder signal and the cylinder position signal and the other five cylinder reversal ignition position signals and the ignition signal 4a to ignite each cylinder.

[0014]

With the above structure, the reference position signal 1a for the first cylinder is continuously input as shown in FIG.
Moreover, when the ignition signal 4a overlaps with the reference position signal 1a, simultaneous ignition of a plurality of cylinders can be prevented and ignition of all cylinders can be prohibited, and ignition is not performed in the intake process of the engine or the like. .

[Brief description of drawings]

FIG. 1 is a block diagram showing a configuration of the present invention.

FIG. 2 is a detailed diagram of a cylinder discrimination circuit 3 of FIG.

FIG. 3 is a timing diagram showing the operation of FIG.

FIG. 4 is a timing diagram when misfire occurs when the reference position signal for the first cylinder is not input in the order of ignition in the conventional configuration.

FIG. 5 is a timing diagram when erroneous ignition is prevented when the reference position signals of the first cylinder are not input in the order of ignition in the configuration of FIG. 1.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Reference position detector, 2 ... Angle detector, 3 ... Cylinder discrimination circuit, 4 ... Calculation device, 5 ... Reference cylinder signal distribution circuit 11-11
16 ... OR circuit, 20 ... AND circuit, 21 ... Flip-flop circuit, 31 ... AND circuit, 32 ... Rise detection circuit, 33 ... Angle pulse counter, 34-38 ... AND
Circuit, 61 ... First cylinder AND circuit, 62 ... Second cylinder AN
D circuit, 63 ... Third cylinder AND circuit, 64 ... Fourth cylinder A
ND circuit, 65 ... Fifth cylinder AND circuit, 66 ... Sixth cylinder AND circuit, 71 ... First cylinder ignition coil, 72 ... Second cylinder ignition coil, 73 ... Third cylinder ignition coil, 74 ... Fourth
Cylinder ignition coil, 75 ... fifth cylinder ignition coil, 76 ... sixth cylinder ignition coil.

Claims (2)

[Claims] 1. An engine having a plurality of cylinders, a reference position detector connected to a rotation shaft of the engine for detecting the position of each cylinder, and an engine rotation connected to the rotation shaft of the engine like the reference position detector. An electronic distribution ignition device having an angle detector for detecting an angle and an ignition signal output means for taking in each output signal of the two detectors and outputting an ignition signal, a means for preventing simultaneous ignition of a plurality of cylinders is provided. An electronic power distribution ignition device. 2. A method for preventing simultaneous ignition of a plurality of cylinders according to claim 1,
An electronic distribution ignition device comprising means for inhibiting the output of all ignition signals.