KR930008807B1 - Ignition timing control device - Google Patents

Abstract

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Description

Ignition timing controller

1 is a schematic block diagram of an ignition timing control apparatus according to an embodiment of the present invention.

2 is a flowchart showing an operation sequence according to an embodiment of the present invention.

3A and 3B are views showing the target ignition timing ranges to which the ignition timing braking is applied after confirming and before confirming the cylinder according to one embodiment of the present invention.

4 is a waveform diagram of a reference position detection signal and an ignition coil current according to an embodiment of the present invention.

5 is a flowchart showing an operation sequence according to another embodiment of the present invention.

6A and 6B are diagrams showing respective target ignition timing ranges to which the ignition timing braking is applied after and after confirmation of cylinder identification according to another embodiment of the present invention.

7 is a waveform diagram of a reference position detection signal and an ignition coil current according to another embodiment of the present invention.

8 is a waveform diagram of a conventional reference position detection signal.

9 is a waveform diagram of a reference position detection signal and an ignition coil current of a device having a conventional ignition timing braking function.

10 is a waveform diagram of a reference position detection signal in a case where the second reference position is offset by a predetermined angle only in a specific cylinder in the related art.

* Explanation of symbols for main parts of the drawings

1: rotation signal generator 2: interface circuit

3: microcomputer 4: specific cylinder identification means

5: offset correction processing means 6: ignition timing braking processing means

7: Ignition time and start of operation calculation.

In the drawings, the same reference numerals indicate the same or corresponding parts.

The present invention relates to an ignition timing control device for controlling the ignition timing and the like of the internal combustion engine.

The conventional electronic ignition timing control device calculates the ignition timing based on the reference position detection signal as shown in FIG. 8 which inverts at the predetermined first and second reference positions, and calculates the ignition timing from the first and second reference positions. The ignition timing and the energization start time are determined and controlled by the time of.

In addition, when the ignition timing is set from the second reference position to the advance side to prevent abnormal ignition of the ignition at the beginning of rapid acceleration of the engine, the so-called ignition forcibly cutting off the ignition coil current when the second reference position is detected as in the ninth degree. Perform timing braking.

In the conventional ignition timing control device as described above, when only the specific cylinder offsets the second reference position and the cylinder is identified by the period ratio of the reference position detection signal, only the specific cylinder such as the tenth and b degrees advances the second reference position. Alternatively, in the case of using the reference position detection signal offset by a predetermined angle to the perceptual side, there is a problem in that a specific cylinder causes a time difference with respect to the offset angle, which causes an abnormal perception of misfire and ignition.

The present invention is to solve this problem, the ignition timing that can prevent the abnormal perception during the initial acceleration of the engine by using the reference position detection signal by offsetting the second reference position by a predetermined angle only to the specific side or the perceptual side only a specific cylinder. The purpose is to obtain a control device.

The ignition timing controller according to the present invention calculates the ignition timing based on a reference position detection signal indicating predetermined first and second reference positions corresponding to each cylinder in synchronization with the rotation of the engine, An ignition timing control apparatus for controlling the ignition timing by a time from a second reference position, wherein the specific cylinder is identified by offsetting the second reference position of the reference position detection signal by a predetermined angle to the advance or perceptual side. The target ignition timing is on the advance side rather than the crank angle of the engine corresponding to the specific cylinder identification means and the second reference position other than the specific cylinder for each cylinder, and has not yet been ignited at the time of detection of the second reference position. Is on the advanced side to ignite immediately when the Ignition timing braking processing means for igniting and offset correction processing means for performing offset correction processing on said specific cylinder.

According to the present invention, when the second reference position is offset to the advance side before the cylinder identification is confirmed, the cylinder is offset-corrected by the offset correction processing means for each cylinder and then braked by the ignition timing braking processing means. When offset to the crust side, the braking process is performed by the ignition timing braking means, and after the cylinder identification is confirmed, the offset correction processing is performed by the offset correction processing means for the specific cylinder, and then the braking processing is performed by the ignition timing braking means.

1 is a schematic block diagram showing an ignition timing control device according to an embodiment of the present invention.

In the figure, 1 is a rotation signal generator, 2 is an interface arc connected to the rotation signal generator 1, 3 is a microcomputer, and the rotation signal generator 1 is supplied to the microcomputer 3 through the interface circuit 2. Specific cylinder identification means (4) for identifying the particular cylinder based on the period ratio of the reference position detection signal to be used, offset correction processing means (5) for offset correction processing at the time of identification of the specific cylinder, and the telephone timing is the advancing side from the second reference position Is set, the ignition timing braking means 6 for ignition timing braking at the time of detecting the second reference position, and the ignition time and energization start time calculating means 7 for calculating the ignition time and energization start time. .

2 is a flowchart showing the operation procedure of the present invention.

3A and 3B show the target ignition timing ranges for applying the ignition timing braking before the cylinder identification after the cylinder identification, respectively.

4 is a waveform display of the reference position detection signal and the ignition coil current according to the present invention.

In the ignition timing control configured as described above, first, it is determined in step S1 of FIG. 2 whether before or after the determination of the barrel identification.

If it is before confirmation, it bypasses step S2 and advances to step S3.

In step S3, offset correction processing is performed by the offset correction processing means 5 of FIG. In this case, if the offset correction process is not performed, there is a fear that the specific cylinder may be advanced to ignition abnormality. Next, the process proceeds to step S4. In this step, if the ignition timing braking is not performed at the initial stage of the rapid acceleration of the engine, the ignition abnormality may be perceived. The ignition time braking process is carried out by (I), and the ignition time and energization start time are calculated by the ignition time and energization start time calculation means (7). After the determination, the flow advances to step S2 to determine whether or not it is a specific cylinder. In the case of the other cylinder, the step S3 is bypassed and the flow proceeds to step S4 to calculate the ignition timing braking process, the ignition time and the energization start time.

If it is a specific cylinder, it progresses to step S3 and performs the above-mentioned offset process, and it progresses to step S4 and calculates the above-mentioned ignition timing braking process, ignition time, and energization start time.

The operation waveforms obtained by operating in this manner are shown in FIGS. 3 and 4. Next, another Example of this invention is described.

The block diagram of the ignition timing controller according to this embodiment is the same as that of the first diagram, and the description thereof is omitted.

5 is a flowchart showing the operation procedure of this embodiment.

6A and 6B show the target ignition timing ranges to which the ignition timing braking is applied after the cylinder identification and before the cylinder identification, respectively.

7A and 7B are waveform display diagrams of a reference position detection signal and an ignition coil current according to another embodiment of the present invention.

In the ignition timing control configured as described above, first, it is determined in step S1 of FIG. 5 whether the cylindrical wall is before or after the determination. If it is before confirmation, it bypasses step S2 and step S3, and progresses to step S4. In step S4, if the ignition timing is not braked at the initial stage of rapid acceleration of the engine, the ignition abnormality may be perceived. Therefore, the ignition timing braking processing is performed by the braking processing means 6 of FIG. The ignition time and energization start time are calculated by the means 7. After the determination, the flow advances to step S2 to determine whether or not the specific cylinder. If it is another cylinder, it bypasses step S3, it progresses to step S4, and performs the same operation | movement as the above-mentioned cylinder confirmation.

If it is a specific cylinder, it progresses to step S3 and the offset correction process means 5, after offset processing, it progresses to step S4 and calculates the above-mentioned ignition timing braking process, ignition timing, and energization start time. In this case, if the cylinder is not offset-corrected after the cylinder identification is confirmed, there is a possibility that the specific cylinder may be perceived as ignition abnormality as shown in Fig. 7c.

The operation waveforms obtained by the above-described operation are shown in FIGS. 6 and 7a and b.

As described above, the ignition timing is calculated based on a reference position detection signal indicating predetermined first and second reference positions corresponding to each cylinder in synchronization with the rotation of the engine. An ignition timing control apparatus for controlling an ignition timing by a time from a reference position, wherein the specific cylinder is configured to identify the specific cylinder by offsetting the second reference position of the reference position detection signal by a predetermined angle to the true or the perceptual side. If the target ignition timing is on the true side of the identification means and the crank angle of the engine corresponding to the second reference position other than the specific cylinder for each cylinder, and is not yet ignited at the time of detection of the second reference position, the ignition immediately occurs. Ignition timing braking processing means, and offset correction processing means for performing offset correction processing on the specific cylinder And, if the second reference position is offset to the true side before the cylinder identification is confirmed, offset correction processing is performed on the offset correction processing means for each cylinder, and then braking is performed by the ignition timing braking processing means. When the second reference position is offset to the perceptual side, the braking process is performed by the ignition timing braking means. After the determination of the cylinder identification, an offset correction process is performed on the specific cylinder by the offset correction processing means. Since the braking means is applied to the braking means, it is possible to prevent abnormal perception during the initial acceleration of the engine.

Claims (1)

The ignition timing is calculated based on the reference position detection signal indicating the predetermined first and second reference positions corresponding to each cylinder in synchronization with the rotation of the engine, and by the time from the first or second reference position. An ignition timing control device for controlling an ignition timing, comprising: a specific cylinder identification means for identifying a specific cylinder by offsetting the second reference position of the reference position detection signal by a predetermined angle only to a specific cylinder or to each cylinder; Ignition timing braking processing means for causing the target ignition timing to be on the advance side more than the crank angle of the engine corresponding to the second reference position other than the specific cylinder, and to immediately ignite when the second reference position has not yet been ignited; And an offset correction processing means for performing an offset correction process on the specific cylinder, before identifying the cylinder. Is offset by the offset correction processing means for each cylinder when the second reference position is offset to the true side, and then brake processing is performed by the ignition timing braking processing means, and the second reference position is offset to the perceptual side. In this case, the braking process is performed by the ignition timing braking means. After the identification of the cylinder is confirmed, an offset correction process is performed by the offset correction processing means for the specific cylinder, and then the braking process is performed by the ignition timing braking means. Ignition timing control device, characterized in that.

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