JPH1047219A - Ignition timing control device for internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve engine efficiency of an internal combustion engine by preventing ignition timing from being delayed when rotational variation and the like is caused in an output shaft of the internal combustion engine. SOLUTION: A plurality of tooth rows 6, 6... which have predetermined space are mounted in a rotational plate 5 and also respective additional tooth part 7 for outputting ignition confirming signals at every cylinder from a crank sensor 8 is disposed at a position adjacent to an top dead point at every respective cylinders corresponding the respective tooth row parts 6. Ignition timing at respective cylinder by an ignition timing operation means and output timing of the ignition confirming signal are compared and ignition control to an applicable cylinder is forced to do when the ignition confirming signal is outputted faster.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition timing control device for an internal combustion engine which is suitably used for controlling the ignition timing of an internal combustion engine, and more particularly to an ignition timing control device which performs time control based on a signal from a crank angle sensor. The present invention relates to an ignition timing control device for an internal combustion engine that controls the ignition timing.

[0002]

2. Description of the Related Art Generally, a rotating body which is rotated by an output shaft of an internal combustion engine, a plurality of detection parts provided at a predetermined interval on the rotating body, and each of the detection parts when the rotating body rotates. A rotation sensor for detecting and outputting a detection signal, speed calculation means for calculating the rotation speed of the rotating body based on the detection signal from the rotation sensor, and calculating the ignition timing of the internal combustion engine from the rotation speed by the speed calculation means 2. Description of the Related Art An ignition timing control device for an internal combustion engine, which includes an ignition timing calculating means for performing ignition, is known.

Therefore, a conventional ignition timing control apparatus for an internal combustion engine of this type will be described with reference to FIGS. 4 and 5. The detection signal shown in FIGS. This is a pulse signal detected every (for example, 30 degrees). These detection signals change the periods A1 and A2 between the pulses in accordance with the rotation speed (engine speed) of the internal combustion engine, and when the rotation speed is low, the period A1
When the pulse interval is long and the rotation speed is high, the pulse interval becomes short as in the period A2.

As a result, when the detection signal is measured with a pulse interval of A1 as shown in FIG. 4, a time .tau.1 is obtained from a pulse signal serving as an ignition timing.
After the rotation of the internal combustion engine, a spark discharge is generated by the ignition plug, and the air-fuel mixture is burned (exploded) in the combustion chamber of the internal combustion engine. When the internal combustion engine rotates at high speed, a time τ2 as an ignition timing is obtained from the pulse signal as shown in FIG. 5, and this time τ2 is shorter than the time τ1 shown in FIG. Reach.

[0005]

In the above-mentioned prior art, the ignition timing is temporally controlled based on a detection signal consisting of a pulse train. Therefore, for example, when the internal combustion engine is started, the rotational speed greatly fluctuates. Then, an error may occur in the ignition timing due to the rotation fluctuation. If the ignition timing is too fast, the resistance of the piston or the like in the compression stroke of the internal combustion engine is increased, while if the ignition timing is too late, the air-fuel mixture burns after entering the expansion stroke of the internal combustion engine. As a result, there is a problem that the engine efficiency is reduced.

The present invention has been made in view of such problems of the prior art, and can prevent a delay in ignition timing even when a large rotation fluctuation or the like occurs in an output shaft of an internal combustion engine, thereby improving engine efficiency. It is an object of the present invention to provide an internal combustion engine ignition timing control device that can be increased.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a rotating body which is rotated by an output shaft of an internal combustion engine, and a plurality of detecting portions provided on the rotating body at predetermined intervals. A rotation sensor that detects each of the detection parts and outputs a detection signal when the rotation body rotates, a speed calculation unit that calculates a rotation speed of the rotation body based on a detection signal from the rotation sensor; The present invention is applied to an ignition timing control device for an internal combustion engine comprising: an ignition timing calculating means for calculating an ignition timing of the internal combustion engine from a rotation speed by means.

A feature of the structure adopted in the first aspect of the present invention is that the rotating body is located closer to the top dead center side of the internal combustion engine than each of the detection parts and receives an ignition confirmation signal from the rotation sensor. That is, an additional detection portion to be output is provided.

With this configuration, an ignition confirmation signal for confirming ignition before the internal combustion engine reaches the top dead center can be output even when the rotational speed changes rapidly, and the ignition confirmation signal is output. It becomes possible to correct or correct the ignition timing according to the ignition state of the internal combustion engine at the time when the ignition is performed.

A feature of the structure adopted by the invention of claim 2 is that it is provided on the rotating body at a position closer to the top dead center side of the internal combustion engine than each of the detection parts, and the rotation sensor detects ignition from the rotation sensor. An additional detection part for outputting a signal is compared with an ignition timing by the ignition timing calculation means and an output timing of the ignition confirmation signal. When the ignition confirmation signal is outputted earlier, the internal combustion engine is output. And forcible ignition control means for forcibly controlling the ignition of the vehicle.

With this configuration, an ignition confirmation signal for confirming ignition before the internal combustion engine reaches the top dead center can be output even when the rotational speed changes abruptly, and at least the internal combustion engine has a top dead center. Before passing the point, the forced ignition can be performed by the forced ignition control means.

Further, the structure adopted by the invention of claim 3 is different from the rotating body provided in the multi-cylinder internal combustion engine and rotated by the output shaft of the internal combustion engine for each of the cylinders provided in the rotating body. A plurality of detection portions having a combination, a rotation sensor that detects each of the detection portions when the rotating body rotates, and outputs a detection signal including a signal sequence different for each of the cylinders; and a detection signal from the rotation sensor. Speed calculation means for calculating the rotation speed of the rotating body based on the above, cylinder discrimination means for discriminating an ignition cylinder based on a signal sequence of a detection signal output from the rotation sensor, discrimination results by the cylinder discrimination means and the speed An ignition timing control device for an internal combustion engine, comprising: an ignition timing calculating means for calculating an ignition timing for each of the cylinders based on a rotation speed by a calculating means. An additional detection portion provided on the rotating body and outputting an ignition confirmation signal for each cylinder from the rotation sensor; and an ignition timing for each cylinder and an output timing of the ignition confirmation signal by the ignition timing calculation means. For comparison, a forced ignition control means for forcibly controlling the ignition of the corresponding cylinder when the ignition confirmation signal is output earlier is provided.

With this configuration, even if the rotational speed changes rapidly, the ignition check for checking the ignition for each cylinder before the ignition cylinder reaches the top dead center in the multi-cylinder internal combustion engine. When the ignition cylinder is not ignited at the time when the ignition confirmation signal is output, the forced ignition of the ignition cylinder can be performed by the forced ignition control means at least before passing through the top dead center. .

[0014]

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

FIG. 1 to FIG. 3 show an embodiment of the present invention.

In FIG. 1, reference numeral 1 denotes an engine as an internal combustion engine. The engine 1 has, for example, four cylinders 1A (only one cylinder is shown) and reciprocates in each cylinder 1A to form each combustion chamber 1B. A piston 1C for sucking an air-fuel mixture therein and discharging the exhaust gas after combustion toward an exhaust pipe (not shown), and is attached to the piston 1C via a piston pin (not shown) to reciprocate the piston 1C. And a cylinder head 1E mounted on each cylinder 1A. The cylinder head 1E has an intake valve 1F for each cylinder 1A.
Is provided.

Reference numeral 2 denotes an intake manifold provided on the intake side of the cylinder head 1E. The intake manifold 2 is provided with an injection valve 3 (only one is shown) at the tip end thereof, and is injected from the injection valve 3. A mixture of fuel and intake air is drawn into the combustion chamber 1 </ b> B during the intake stroke of the engine 1.

Reference numeral 4 denotes a spark plug provided on the cylinder head 1E of the engine 1. The front end of the spark plug 4 slightly projects into the combustion chamber 1B of the engine 1, and when the ignition timing comes, the combustion chamber 1B As described above, the air-fuel mixture is ignited, and the air-fuel mixture is burned (exploded).

Reference numeral 5 denotes a rotating plate as a rotating body which is rotated in the direction of arrow A by a crankshaft 1D of the engine 1 and the like.
The rotary plate 5 is provided on a camshaft 1G that opens and closes the F, and the rotating plate 5 makes one rotation when the crankshaft 1D makes two rotations.
Are provided at predetermined intervals on the outer peripheral side of the rotary plate 5 as a plurality of detection portions, and each tooth row portion 6 corresponds to each of the cylinders and has a different combination. Are formed by a plurality of tooth portions 6A, 6A,.

Here, among the rotational positions of the rotary plate 5, for example, at the rotational position corresponding to the first cylinder, the tooth row portion 6 is constituted by only one tooth portion 6A, and similarly the rotational position corresponding to the third cylinder. At the position, the dentition 6 is constituted by three teeth 6A. Further, at the rotation position corresponding to the fourth cylinder, the tooth row portion 6 is formed by the four tooth portions 6A, and at the rotation position corresponding to the second cylinder, the tooth row portion 6 is formed by the two tooth portions 6A. Have been. Each tooth portion 6A located at the head of each tooth row portion 6 is disposed on the front side by a certain angle with respect to the top dead center of each cylinder.

Further, the rotary plate 5 is provided with additional teeth 7, 7,... As additional detection parts located near the top dead center (immediately before the top dead center) of each cylinder. The tooth portion 7 causes a crank angle sensor 8 described later to output an ignition confirmation signal Si (see FIG. 3) for each cylinder.

Reference numeral 8 denotes a crank angle sensor as a rotation sensor provided in the engine 1 or the like, which is located in the vicinity of the rotary plate 5, and which is used when the rotary plate 5 rotates in the direction of arrow A. Each tooth 6A is detected by an electromagnetic pickup or the like, and a detection signal S composed of a signal sequence different for each cylinder is provided.
At the same time, each additional tooth portion 7 is also detected, and an ignition confirmation signal Si for each cylinder is also output. Then, the detection signal S output from the crank angle sensor 8 and the ignition confirmation signal Si are input to the control unit 9.
Reference numeral 9 denotes a control unit as a control device constituted by a microcomputer or the like. The input side of the control unit 9 is connected to the crank angle sensor 8 and a battery (not shown), and the output side thereof is connected to the ignition plug 4 and the like. It is connected. The control unit 9 stores the program shown in FIG. 2 in the memory 9A of the storage circuit or the like, and performs an ignition control process, a fuel injection process, and the like for each cylinder.

The control unit 9 also controls the rotating plate 5 based on the detection signal S output from the crank angle sensor 8.
And the memory 9A stores a map of a threshold X described later, which is variably set in accordance with the rotation speed of the rotating plate 5, and the like. Further, the control unit 9 is provided with a timer 9B.
Is a time counter for counting clock signals, and is configured by software.

The ignition timing control device for an internal combustion engine according to the present embodiment has the above-described configuration. Next, an ignition control process and the like by the control unit 9 will be described with reference to FIGS.

First, when the engine start switch (not shown) is turned on and the processing operation is started, the detection signal S or the ignition confirmation signal Si output from the crank angle sensor 8 is read in step 1, and in step 2. The pulse interval T between these signals S and Si is measured using a timer 9B. At this time, a period τa is obtained from the detection signal S for each fixed rotation position (for example, 180 degrees) shown in FIG. 3, and the rotation speed of the rotating plate 5 is calculated from the period τa. The searched threshold X is searched from the map.

Next, in step 3, the pulse interval T is compared with the threshold value X. If the pulse interval T is smaller than the threshold value X, the determination is "NO" and the process proceeds to step 7 described later. When the pulse interval T is equal to or longer than the threshold X, “YE
S ”, the process proceeds to step 4, and the current detection signal S is recognized as a signal serving as a reference for ignition processing, and is used as a reference for ignition control.

That is, the threshold value X changes according to the rotation speed of the rotary plate 5, is smaller than the period τa for each fixed rotation position, and is determined by the initial detection signal S from each tooth row 6 and the additional tooth 7. Since the period (τa>X> τb) is set to be larger than the period τb between the ignition confirmation signal Si and the pulse interval T, the pulse interval T is larger than the threshold X and T> X (for example, T> X).
= T4), the ignition reference position for each cylinder can be detected.

Next, in step 4, cylinder discrimination is performed from the count value of the cylinder discrimination counter in step 10 described later. For example, as shown in FIG. 3, when the signal train of the detection signal S is composed of one pulse, the third cylinder located on the rear side with respect to the rotation direction of the rotating plate 5 (the direction indicated by the arrow A) sets the ignition timing. The cylinder is determined to be approaching. Similarly, when the signal sequence of the detection signal S includes three pulses, the cylinder is determined to be approaching the ignition timing of the fourth cylinder.

If the signal sequence of the detection signal S is composed of four pulses, it is determined that the second cylinder is approaching the ignition timing, and the cylinder of the detection signal S is composed of two pulses. In this case, it is determined that the first cylinder is approaching the ignition timing. Then, based on the cylinder discrimination result in step 4, in step 6 described later, as shown in FIG. 3, the first cylinder (# 1) → the third cylinder (# 3) → the fourth cylinder (# 4) → the second cylinder (# 2) The ignition is performed for each cylinder in the order of the first cylinder (# 1).

In step 5, it is determined which cylinder has reached the intake stroke based on the result of the determination of the ignition cylinder in step 4, and the fuel injection timing is calculated.
When the injection timing is reached, fuel injection is performed from the injection valve 3 toward the combustion chamber 1B, and the air-fuel mixture is sucked into the combustion chamber 1B.

Next, in step 6, the ignition timing from the time when the ignition reference position for each cylinder is detected to the time when the ignition plug 4 of the ignition cylinder is ignited is calculated, and the corresponding cylinder is set to this ignition timing. Each time the ignition coil (not shown) is energized, the ignition coil 4 starts energization, and the ignition plug 4 ignites the air-fuel mixture in the combustion chamber 1B. Then, the count value of the cylinder discrimination counter and the period τa corresponding to the rotation speed are stored in the memory 9A in an updatable manner, and the count value is reset.

On the other hand, the pulse intervals T1, T shown in FIG.
If the pulse interval T is smaller than the threshold value X, such as 2, T3, etc., it is determined "NO" in step 4, so the process proceeds to step 7 to determine whether or not the current signal is the ignition confirmation signal Si. If the signal is the ignition confirmation signal Si, "YES" is determined in the step 7, and the process proceeds to a step 8 described later. When the signal is not the ignition confirmation signal Si, "NO" is determined in the step S7, and the routine goes to the step S10 to increment the count value of the cylinder determination counter to "1".
Step by step.

Here, the ignition confirmation signal Si is located closer to the top dead center of each cylinder than the cylinder discrimination detection signal S and is output after the signal train of each detection signal S. After the discrimination counter reaches the count value corresponding to each cylinder, the output time of the ignition confirmation signal Si is determined by whether or not the next signal is detected by the crank angle sensor 8 during the period τb.

Then, at step 7, the ignition confirmation signal Si
Is detected, the routine proceeds to step 8, where it is determined whether or not the ignition timing in step 6 has already passed. That is, the period τb from the detection of the predetermined ignition reference position to the input of the ignition confirmation signal Si is compared with the ignition timing based on the calculation result, and when the period τb is smaller than the ignition timing, “ "NO" is determined, and the routine proceeds to step 9.

Next, in step 9, the energization of an ignition coil (not shown) is forcibly started, and the ignition plug 4
Thus, a forced ignition control process for igniting the air-fuel mixture in the combustion chamber 1B of the ignition cylinder is performed. And even after the ignition is over,
In step 10, the count value of the counter is incremented by "1".

Thus, according to the present embodiment, the engine 1
Are provided at the position immediately before the top dead center of each cylinder on the rotary plate 5 which rotates integrally with the camshaft 1G of each of the camshafts 1G. An ignition confirmation signal Si for each cylinder can be output, and it can be confirmed from the ignition confirmation signal Si whether the ignition cylinder has reached the ignition timing before the piston 1C of the engine 1 reaches the top dead center position.

If the ignition timing has not been reached when the ignition confirmation signal Si is output, the control unit 9 forcibly starts energizing an ignition coil (not shown), and the ignition plug 4 A forced ignition control process for igniting the air-fuel mixture in the combustion chamber 1B can be performed, and even if the rotation speed of the engine 1 fluctuates greatly,
The ignition timing can be prevented from being after passing through the top dead center, and the engine efficiency can be improved.

Further, since each tooth row 6 for outputting a different signal train for each cylinder and each additional tooth 7 for outputting the ignition confirmation signal Si are provided on the same rotary plate 5, one crank is provided. Only one system signal output from the angle sensor 8 can detect a constant rotational position and determine a cylinder of each cylinder, and can confirm whether or not the ignition timing has elapsed. Therefore, the present invention can be easily and economically applied to an existing ignition timing control device.

In the above-mentioned embodiment, in the program shown in FIG. 2, step 2 shows a specific example of the speed calculating means for specifying the present invention, and step 4 shows a specific example of the cylinder discriminating means. Step 6 shows a specific example of the ignition timing calculation means, and steps 8 and 9 show a specific example of the forced ignition control means.

In the above-described embodiment, the case where the rotary plate 5 is attached to the camshaft 1G of the engine 1 has been described as an example. However, the present invention is not limited to this, and the crankshaft 1D is not limited to two.
The rotating body may be attached to, for example, a distributor shaft that makes one rotation when rotating, and in some cases, the rotating body may be provided on the crankshaft 1D.

Further, in the above-described embodiment, each tooth 6A and each additional tooth 7 provided on the rotating plate 5 are detected by the crank angle sensor 8 composed of an electromagnetic pickup, but the present invention is not limited to this. Instead, for example, a rotating body such as the rotating plate 5 may be provided with a plurality of slits to serve as detection portions, and the present invention may be applied to a rotating body such as an optical sensor including a light emitting device and a light receiving device. , An additional slit may be added to the rotating body as a detection site.

[0042]

As described above in detail, according to the first aspect of the present invention, the ignition confirmation signal is output from the rotation sensor at a position closer to the top dead center of the internal combustion engine than the respective detection portions provided on the rotating body. An additional detection part to be output is provided on the rotating body, so even if the rotation speed fluctuates rapidly and an error occurs in the ignition timing by the ignition timing calculation means, the ignition check is performed before the internal combustion engine reaches the top dead center. A signal can be output, the ignition timing can be corrected or corrected in accordance with the ignition status of the internal combustion engine at the time when the ignition confirmation signal is output, and the ignition timing can be prevented from being delayed. Efficiency can be increased.

According to the second aspect of the present invention, the ignition timing by the ignition timing calculating means is compared with the output timing of the ignition confirmation signal, and when the ignition confirmation signal is outputted earlier, Since it is configured to include forced ignition control means for forcibly performing ignition control on the internal combustion engine, even if the rotation speed fluctuates greatly, the ignition confirmation signal output before the internal combustion engine reaches the top dead center, Forced ignition can be performed by the forced ignition control means at least before the internal combustion engine passes through the top dead center, and it is possible to prevent the ignition timing from being delayed and improve the engine efficiency.

Further, according to the third aspect of the present invention, a detection portion for outputting a detection signal of a different signal sequence for each cylinder from the rotation sensor and an additional detection portion for outputting an ignition confirmation signal for each cylinder are provided. It is provided on the rotating body, compares the ignition timing of each cylinder by the ignition timing calculation means with the output timing of the ignition confirmation signal, and when the ignition confirmation signal is output earlier, by the forced ignition control means, Since the ignition control to the corresponding cylinder is forcibly performed, the ignition for confirming the ignition before the ignition cylinder reaches the top dead center in the multi-cylinder internal combustion engine even when the rotational speed fluctuates greatly A confirmation signal can be output, and when the ignition timing has not been reached at the time when the ignition confirmation signal is output, the ignition cylinder can be forcibly ignited by the forced ignition control means at least before passing through the top dead center. On that, the ignition timing can be enhanced engine efficiency can be surely prevented from delaying. And
Since the determination of the ignition cylinder, the calculation of the ignition timing, and the control for preventing the delay of the ignition timing can be performed only by the signal output from one rotation sensor, there is no need to provide another sensor specially. The present invention can be easily and economically applied to the ignition timing control device.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an ignition timing control device for an internal combustion engine according to an embodiment of the present invention.

FIG. 2 is a flowchart showing an ignition timing control process by a control unit shown in FIG. 1;

FIG. 3 is a characteristic diagram showing a detection signal and an ignition confirmation signal output from a crank angle sensor in FIG. 1;

FIG. 4 is a characteristic diagram showing a detection signal and an ignition signal of a rotation sensor according to the related art.

FIG. 5 is a characteristic diagram illustrating a detection signal and an ignition signal of a rotation sensor when the internal combustion engine is rotating at a high speed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Engine (internal combustion engine) 1D Crankshaft (output shaft) 5 Rotating plate (rotating body) 6 Teeth row part 6A Tooth part (detected symmetric object) 7 Additional tooth part (additional symmetric object) 8 Crank angle sensor (rotation sensor) 9) Control unit S detection signal Si ignition confirmation signal

Claims (3)

[Claims] A rotating body that is rotated by an output shaft of an internal combustion engine; a plurality of detection portions provided at predetermined intervals on the rotating body; and a plurality of detection portions that are detected when the rotating body rotates. A rotation sensor for outputting a detection signal, speed calculation means for calculating the rotation speed of the rotating body based on the detection signal from the rotation sensor, and ignition for calculating the ignition timing of the internal combustion engine from the rotation speed by the speed calculation means In an ignition timing control device for an internal combustion engine comprising timing calculation means,
The rotating body is provided with an additional detection portion which is located closer to the top dead center side of the internal combustion engine than the respective detection portions and outputs an ignition confirmation signal from the rotation sensor. Timing control device. 2. A rotating body which is rotated by an output shaft of an internal combustion engine, a plurality of detecting portions provided at predetermined intervals on the rotating body, and each detecting portion is detected when the rotating body rotates. A rotation sensor for outputting a detection signal, speed calculation means for calculating the rotation speed of the rotating body based on the detection signal from the rotation sensor, and ignition for calculating the ignition timing of the internal combustion engine from the rotation speed by the speed calculation means An ignition timing control device for an internal combustion engine, comprising: timing calculation means; provided on the rotating body at a position closer to the top dead center side of the internal combustion engine than each of the detection portions; and outputting an ignition confirmation signal from the rotation sensor. An additional detection portion to be compared with the ignition timing by the ignition timing calculation means and the output timing of the ignition confirmation signal, and when the ignition confirmation signal is output earlier, the internal combustion engine Ignition timing control apparatus for an internal combustion engine characterized by being configured to include a forced ignition control means force the ignition control. 3. A rotating body provided in a multi-cylinder internal combustion engine and rotated by an output shaft of the internal combustion engine; and a plurality of detection parts provided on the rotating body and having different combinations for each of the cylinders; A rotation sensor that detects each of the detection parts when the rotating body rotates and outputs a detection signal composed of a signal sequence different for each cylinder; and calculates a rotation speed of the rotating body based on the detection signal from the rotation sensor. Speed calculating means, cylinder discriminating means for discriminating an ignition cylinder based on a signal sequence of a detection signal output from the rotation sensor, and each of the cylinders based on a discrimination result by the cylinder discriminating means and a rotation speed by the speed calculating means. An ignition timing control device for an internal combustion engine, comprising: an ignition timing calculating means for calculating an ignition timing of the engine. An additional detection part for outputting an ignition confirmation signal for each cylinder is compared with the ignition timing for each cylinder and the output timing of the ignition confirmation signal by the ignition timing calculation means. An ignition timing control device for an internal combustion engine, comprising: forced ignition control means for forcibly controlling ignition of a corresponding cylinder when the signal is output earlier.