KR950006876B1 - Cylinder discerning apparatus for i. c. engine - Google Patents

Abstract

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Description

Cylinder identification device of internal combustion engine

1 is a block diagram of a cylinder identification device of an internal combustion engine according to the present invention.

2 is a perspective view showing a reference position signal generator and a rotation angle signal generator of the cylinder identification device of the internal combustion engine.

3 is a signal waveform diagram of a rotation signal generator according to the first embodiment.

4 is a flowchart showing a cylinder identification operation in the first embodiment.

5 is a signal waveform diagram of a rotation signal generator according to the second embodiment.

6 is a signal waveform diagram of a rotation signal generator according to a third embodiment.

7 is a flowchart showing the cylinder identification operation of the third embodiment.

8 is a signal waveform diagram of a rotation signal generator according to a fourth embodiment.

9 is a flowchart showing the cylinder identification operation of the fourth embodiment.

10 is a signal waveform diagram of a rotation signal generator according to a fifth embodiment.

11 is a signal waveform diagram of a rotation signal generator according to a sixth embodiment.

12 is a flowchart showing the cylinder identification operation of the sixth embodiment.

13 is a configuration diagram of a rotation signal generator for a cylinder identification device of a conventional internal combustion engine.

14 is a circuit diagram of the rotation signal generator.

15 is a signal waveform diagram of the rotation signal generator.

16 is a block diagram of a cylinder identification device of an internal combustion engine according to the related art and the present invention.

* Explanation of symbols for main parts of the drawings

11: internal combustion engine 12: reference position signal generator

15: cylinder identification signal generator

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

This invention relates to the cylinder identification device of an internal combustion engine for identifying the cylinder of a multicylinder internal combustion engine.

In general, in order to control the ignition timing or fuel injection of the internal combustion engine, a signal synchronized with the rotation of the engine is used.

A signal generator for generating such a signal is usually attached to the cap shaft of the engine and indirectly detects the rotation of the crankshaft.

13 and 14 show such a rotational signal generator, which represents a six-cylinder rotational signal generator. In the figure, 1 is provided so that the rotation speed of 1/2 with respect to crankshaft rotation is a camshaft. 2 is a rotating disc attached to the camshaft 1, and the window 3a for angle signals and the window 3b for reference signals mentioned later are formed. 4a, 4b and 5a, 5b are light emitting diodes and photodiodes provided corresponding to the positions of these windows 3a, 3b, and the light emitting diodes 4a, 4b and photodiodes 5a, 5b are rotating discs. It is arrange | positioned through (2). 6a and 6b are amplification circuits connected to the output terminals of the photodiodes 5a and 5b, respectively, and 7a and 7b are output transistors of the open collector connected to the output terminals of the amplification circuits 6a and 6b. The rotation signal generator 8 is constituted by 1) to output transistors 7a and 7b.

FIG. 15 is a signal display output from such a rotation signal generator 8, (a) is an angle signal (POP signal) output from the window 3a side of the rotating disc 2, (b) is a window 3b Is the reference signal (REF signal) output from the

In other words, the angle signal is a signal that repeats reversal every time the rotating shaft 1 rotates by 1 °. The angle signal is used to measure the rotation angle of the crank. The reference signal is a signal that inverts the predetermined crank angle for each cylinder and is used as a reference signal of the crank angle. At the same time, the pulse width of the signal at two rotations of the crank (720 ° CA) is set to six different angle widths corresponding to six cylinders, and this pulse width is measured using the angle signal to identify each individual cylinder. . The output signal of the rotation signal generator 8 is input to the microcomputer 10 via the interface circuit 9 as shown in FIG. 16, and is used for control calculation of the engine ignition timing, fuel injection, and the like.

The conventional cylinder discriminating apparatus of the internal combustion engine is configured as described above, and the angle signal and the reference signal are output from the rotation signal generator 8 which detects the reference based on the rotation of the camshaft. However, since the camshaft is driven by a belt or the like from the crankshaft, a phase difference occurs between the camshaft and the crankshaft according to the engine operating state. As a result, the reference signal output from the rotation signal generator 8 is out of the actual crank angle. In the case of controlling the engine and the operation by using the signal, there was a problem that there was a difference in the ignition timing and the desired performance was not obtained.

In order to prevent the difference in the crank angle, it is possible to consider the method of attaching the signal generator to the crankshaft.However, since the crankshaft rotates two times in the stroke from intake to exhaust in the engine between the four, It was impossible to determine the cylinders and it was necessary to install the cylinder discriminating means separately.

The present invention has been made to solve the above problems, and an object thereof is to obtain a cylinder identification device of an internal combustion engine capable of accurate cylinder identification without a difference in crank angle.

The cylinder identification device of the internal combustion engine according to the first invention comprises a cylinder identification signal generating means for generating a cylinder identification signal in accordance with rotation of the internal combustion engine, and first storage means for storing a plurality of signal sequences of the cylinder identification signal, and preset And a second storage means for storing a signal sequence corresponding to the predetermined cylinder, and a cylinder identifying means for identifying the cylinder by comparing the value of the first storage means with the value of the second storage means.

According to the second invention, in the first invention, the cylinder identification signal is set within the generation period of each crank angle reference position signal, and the signal corresponding to the predetermined predetermined cylinder has the same width and the signal corresponding to the other cylinder. The width is set differently, and the cylinder identification means measures the width of the cylinder identification signal so as to perform the communication.

In the third invention, in the second invention, the width of the signal corresponding to the predetermined cylinder is approximately zero, and the signal width corresponding to the other cylinders is set differently, and the cylinder identification means sets the width of the cylinder identification signal. To measure and identify the cylinder.

In the fourth invention, in the first invention, the cylinder identification signal is set so that the crank angle reference position signal is generated within the generation period of the cylinder identification signal, and the signal widths corresponding to the cylinders other than the predetermined cylinder are different, and the cylinder identification means is The cylinder is identified by measuring the width of the cylinder identification signal.

In the fifth invention, in the first invention, the cylinder identification signal is set within the generation period of each crank angle reference position signal, and the number of signal generations is the same as the number of signals corresponding to the predetermined cylinder, and is set differently. The cylinder identification means measures the number of signal occurrences of the cylinder identification signal to identify the cylinder.

In the sixth invention, in the fifth invention, the cylinder identification signal is set in the occurrence period of each crank angle reference position signal, and the number of signals corresponding to the predetermined predetermined cylinder is zero, and the signal corresponding to the other cylinder. The number is set differently, or the cylinder identification means measures the number of signal occurrences of the cylinder identification signal to identify the cylinder.

In the seventh invention, in the first invention, the cylinder identification signal is set so that the crank angle reference position signal is generated within the cylinder identification signal generation period, and the number of signal generations differs for each predetermined number of cylinders, and the cylinder identification means generates the signal of the cylinder identification signal. The number was measured to identify the cylinder.

In the first invention, the reference position of each cylinder is detected by the crank angle reference position signal, and the cylinder identifying means identifies which cylinder the reference position is, so that there is no difference between the reference position and the actual crank angle for each identified base layer. In addition, since the cylinder is identified by the signal sequence of a plurality of sections, the prevention of the misidentification can be performed more reliably.

In the second invention, the cylinder identification signal outputted within the generation section of each crank angle reference position signal has, for example, a different signal width for every other section of the generation section, and the same is otherwise applied, and the cranks of these cylinder identification signals are the same. The cylinder identification of each reference position signal is performed.

In the third invention, the cylinder identification signal output in the generation section of each crank angle reference position signal has, for example, a different signal width in every other section of the generation section, and the signal signal is no signal elsewhere. The cylinder identification of the crank angle reference position signal is performed. In the fourth invention, the cylinder identification signal is output for every other signal of the crank angle reference position signal, for example, and the cylinder identification of each crank angle reference position signal is performed in the signal width of these cylinder identification signals.

In the fifth invention, the cylinder identification signal outputted within the generation section of each crank angle reference position signal is, for example, the number of occurrences of the other signals generated by this generation section, and the other ones are the same. The cylinder identification of the position signal is performed.

In the sixth invention, the cylinder identification signal output in the generation section of each crank angle reference position signal is, for example, the number of signal generations in every other section of the generation section, and the other signals are non-signal, and in each of these cylinder identification signals, The cylinder identification of the crank angle reference position signal is performed.

In the seventh invention, the cylinder identification signal is output for every other signal of the crank angle reference position signal, for example, and the cylinder identification of each crank angle reference position signal is performed in the number of signal occurrences of these cylinder identification signals.

EXAMPLE

1 is a view showing a rotation signal generator of a cylinder identification device of an internal combustion engine according to the first to sixth embodiments of the present invention.

In the figure, 11 is an internal combustion engine, and the case of an internal combustion engine is shown between four of six cylinders. 12 and 13, reference position signal generators and rotation angle signal generators provided opposite to the crankshaft of the engine and an integral ring gear 14 are constituted by sensors of an electronic pickup.

The engine is a cylinder identifier generator installed on the camshaft and consists of an optical sensor. FIG. 3 is a signal waveform diagram obtained by waveform-shaping a signal output from such a rotation signal generator, and shows a first embodiment, and FIG. 3 (a) shows a reference position signal output from the reference position signal generator 12 (a). 3 is a crank angle signal (hereinafter abbreviated as POP signal) output from the rotation angle signal generator 13, and (c) of FIG. 3 is a cylinder identification signal generator 15. The output cylinder identification signal (hereinafter abbreviated as SGC signal) is shown.

That is, three convex portions corresponding to the predetermined angular position of each cylinder are generated on the outer circumferential surface of the ring gear 14 opposite the reference position signal generator 12 so that signals for six cylinders are generated at two rotations of the crankshaft (720 ° C.). An additional portion is formed, and a convex portion is formed on the outer circumferential surface of the ring gear 14 opposite to the rotation angle signal and the rotation angle signal generator 13 so as to output a POP signal every 2 ° C. The SGC signal is set to occur between the signals of each REF signal, and the section is set to be the same pulse.

Also, since the setting position of the SGC signal is offset by a predetermined angle from the setting position of the REF signal, even if there is a mechanical transmission system error (angle phase error) between the crank side and the cam axis of the engine, the angle margin is secured so that the SGC signal is detected between each REF signal. have.

Next, the cylinder identification operation will be described with reference to the flowchart of FIG. The REF signal, the POP signal, and the SGC signal outputted from the rotation signal generator are input to the microcomputer through the interface circuit as in the prior art. The microcomputer first detects the signal width between the REF signals by counting the number of pulses of the POP signal input in the SGC signal " H " level output period based on these signals (step S1). This count value is stored in the series register (step S2). In addition, in step S3, two signal width sequences (coefficient series) are read in step S3 in which the width of the SGC signal between the REF signals and the width of the SGC signal between the REF signals measured last time are read out. It compares with the cylinder reference pulse width series n1 memorize | stored in spep S4.

As a result of the comparison, if it matches n1, the process proceeds to step S5, where the first cylinder is set in the register. In the case of inconsistency, the comparison is made with the reference pulse width series n2 in step S6.

Similarly, in step S6 to S9, the signal width sequence is compared with the reference pulse width sequence, and the coincidence cylinder is set in the register. We draw the cylinder of this time from. In this first embodiment, since the corresponding REF signal at each cylinder reference angle of the engine is output based on the rotation of the crankshaft, a high-precision engine control signal without phase difference with the crankshaft is obtained.

In addition, since the signal width of the SGC signal for identifying the cylinder is four types, it is easy to identify the signal width, thereby reducing the degree of signal width.

In addition, since the cylinder identification is performed in the continuous Z series of the SGC signal, the effect of preventing the cylinder from being incorrectly identified can be further improved.

5 is a waveform diagram of a signal obtained by waveform shaping the output signal of the rotation signal generator according to the second embodiment.

In this second embodiment, as in the first embodiment, the reference position generator 12 and the rotation angle signal generator 13 are installed opposite the ring gear 14, and the cylinder identification signal generator 15 is installed on the camshaft. However, this cylinder identification signal generator 15 is constituted by an electronic pick-up sensor, and the SGC signal is also configured to be generated every other section of each REF signal.

That is, in this embodiment, the REF signal and the POP signal are the same as in the first embodiment, but the SGC signal is generated with three different signal widths in every other section of each REF signal as shown in (C) of FIG. Is configured not to occur.

The cylinder identification operation of the cylinder identification device of the internal combustion engine configured as described above is carried out in the same manner as the operation shown in the flowchart of FIG. 4C except that the SGC signal width between one REF signal of this time or the previous time is necessarily zero. .

In this second embodiment, since the signal width of the SGC signal is three types and the number of cylinders is 1/2, as described above, the signal width can be further relaxed, so that the cylinder identification signal generator 15 can be used as well as the optical sensor. It can be comprised by cheap electronic pickup etc. with low precision and a low resolution.

6 is a waveform diagram showing the signal form of the rotation signal generator according to the third embodiment. In this third embodiment, the REF signal and the POP signal are the same as those of the first and second embodiments, but the generation form of the SGC signal is different. That is, the SGC signal is set so that the "H" level and the "L" level alternate with each level when each REF signal is generated, and the "H" level is output for every cylinder of the REF signal corresponding to each cylinder. There are three kinds of signal widths different from each other. In this embodiment, since the start and end of the SGC signal are set at a predetermined angle away from the crank angle reference position (REF signal start end), an angle margin for the angle phase between the crankshaft and the camshaft is secured.

In this embodiment, the cylinder identification signal generator 15 is constituted by a hall sensor. Next, the cylinder identification operation according to the third embodiment will be described with reference to the flowchart of FIG. First, in step S11, the signal width of the SGC signal at the time of REF signal generation is detected by counting the number of pulses of the POP signal input in the SGC signal "H" level output period. Subsequently, the count value is stored in a series register (step S12). From this series register, at step S13, two consecutive signal widths of the SGC signal width at the time of the REF signal generation and the SGC signal width at the time of the previous REF signal generation are measured. The sequence (coefficient value series) is read out, and this signal width sequence is compared with the cylinder reference pulse width sequence n1 previously stored in step S14.

As a result of the comparison, if it matches n1, the process proceeds to step S15, where the register first cylinder is set. If there is a mismatch, the comparison is made with the reference pulse width series n2 in step S16. In the same manner, when the signal width series is compared with the reference pulse width series in steps S16 to S19, the coincidence cylinder is set in the register, and if the reference pulse series does not match any of the reference pulse sequences in steps S14, S16 and S18, the result of the previous cylinder identification in step S20 Draw the cylinder of this time.

In the third embodiment, the pulse width of the "H" level signal section of the SGC signal is used as the means for cylinder identification. However, the same identification can be performed using the pulse width of the "L" level signal section or both. In the first to third embodiments, the SGC signal width is detected by counting the number of pulses of the POS signal, but the ratio of the SGC signal width period to the period of the REF signal period is measured without using the POS signal. Thus, the same effect can be obtained by detecting a period corresponding to the signal width and judging by the cylinder of this period ratio at this time. 8 is a signal waveform diagram of the rotation signal generator according to the fourth embodiment.

In the fourth embodiment, the SGC signal generated between the REF signals is set so that the number of pulses is different for each conclusion section and the same number of pulses in the other sections.

In other words, the number of pulses generated by the SGC signal is two, three or four for each section, and the number is one in the other sections. The cylinder identification signal generator 15 for generating the SGC signal is constituted by a sensor of an electronic pickup. Next, the cylinder identification operation of the fourth embodiment will be described with reference to the flowchart of FIG. First, in step S, the number of pulses of the SGC signal between the REF signals is counted.

Subsequently, the count value is stored in a series register (step S22). In addition, the signal register sequence is obtained from this series register in step S23, the number of pulses of the SGC signal between the REF signals at this time and the number of pulses of the SGC signal between the REF signals measured last time. The coefficient value series is read out and compared with the cylinder reference pulse number series n1 stored in advance in step S24. As a result of the comparison, if it matches n1, the process proceeds to step S25, where a first cylinder is set in the resist, and in the case of inconsistency, it is compared with the reference pulse number series n2 in step S26. In the same manner, if the signal sequence is compared with the reference pulse sequence in steps S26-S29, and the coincidence cylinder is set in the register, and if it does not match any reference pulse sequence in steps S24 and S26 S28, the result of the previous cylinder identification in step S30 is determined. Develop a meeting cylinder.

10 is a waveform diagram showing an output signal of the rotation signal generator according to the fifth embodiment. In this embodiment, the SGC signal is set for every section between the REF signals. That is, the number of generated pulses of the SGC signal is set to 1, 2, 3 in every other interval. The cylinder identification signal generator 15 is composed of a sensor of an electronic pickup.

The cylinder identification operation is performed by counting the number of pulses of the SGC signal between the REF signals as in the fourth embodiment. If the current SGC signal pulse sequence does not match any of the reference pulse number sequences, this time is the result of the previous cylinder identification. Develop a meeting cylinder.

As described above, in the fifth embodiment, since the number of pulses is 1/2 of the number of cylinders, the number of pulses can be easily identified and the signal accuracy can be further alleviated.

11 is a waveform diagram showing an output signal of the rotation signal generator according to the sixth embodiment. In this embodiment, the SGC signal is set to alternate between the "H" level and the "L" level each time the REF signal is generated, and at the same time every REF signal generated at the "L" level of the SGC signal, that is, every other cylinder. The number of pulses of the SGC signal is set to two, three, or four different intervals defined by the REF signal. The first pulse width of each SGC signal is set to be different. As the cylinder identification signal generator 15, an electronic pickup is used as in the fourth and fifth embodiments.

Next, the cylinder identification operation of the sixth embodiment will be described with reference to the flowchart of FIG. First, in step S31, the number of pulses of the SGC signal in the section defined by the REF signal at the SGC signal "L" level or in the section defined by the REF signal at the SGC signal "H" level is counted.

Subsequently, this count value is stored in a series register (step S32). From this series register, in step S33, the number of two consecutive signals of the number of pulses of the SGC signal between the REF signals and the number of pulses of the SGC signal between the REF signals measured last time The sequence (coefficient value series) is read out and compared with the cylinder reference pulse sequence n1 previously stored in this signal number sequence step S34.

If the result of comparison is equal to n1, the process proceeds to step S35, where a first cylinder is set in the register at the time of the immediately following REF signal generation, and in the case of inconsistency, the reference pulse number series n2 is compared in step S36. In the same manner, if the signal sequence is compared with the reference pulse sequence in steps S36 to S39, the coincidence cylinder is set in the register, and if the reference pulse sequence does not match any of the reference pulse sequence in steps S34, S36 and S38, Draw a cylinder for this session. As described above, in the sixth exemplary embodiment of the present invention, since the signal mode of the SGC signal alternates with each REF signal, it is possible to immediately identify the cylinder group.

In the sixth embodiment of the present invention, the number of pulses of the SGC signal in the section defined by the REF signal occurring in the "L" level section of the SGC signal and the section defined by the REF signal occurring in the "L" level section. The number of pulses in the section defined by the REF signal occurring in the "L" level section and the section defined by the REF signal occurring in the "H" level signal section by inverting the level logic of the SGC signal by counting The same identification can also be made by counting.

Although the rising points of the three types of SGC signals are set differently from the rising points of the REF signals, the rising points of these SGC signals may be the same with respect to the REF signal positions.

In the fourth to sixth embodiments of the present invention, since the cylinder identification is performed by counting the number of pulses of the SGC signal, the burden on the hardware of the microcomputer can be reduced rather than using the pulse width of the SGC signal. In the first to sixth embodiments, two signal sequences are used consecutively as signal sequences of a plurality of sections. However, the present invention is not limited thereto, and three or more signal sequences may be used. In the above embodiment, the cam shaft is used as the rotating shaft which rotates at a 1/2 ratio with respect to the rotation of the crank shaft. In addition, for example, various rotating shafts such as the rotating shaft of the ignition distributor may be used.

According to the cylinder identification device of the internal combustion engine of the present invention as described above, for each output signal of the reference position signal generating means for generating a signal based on the rotation of the crankshaft, the signal is based on the rotation of the shaft rotating at the 1/2 ratio of the crankshaft. By detecting the signal state of the generated cylinder identification signal generating means and identifying the cylinder by the signal sequence of the plural sections of the signal generation, it is possible to accurately identify the cylinder without phase difference from the crank angle and to prevent misidentification. It can be effective.

Claims (7)

Generation of a reference position signal for detecting the rotation of the crankshaft of the internal combustion engine 11 having a plurality of cylinders and the internal combustion engine 11 and generating a crank angle reference position signal REF indicating the reference position of each cylinder. Means 12 and a cylinder identification signal generating means 15 for detecting rotation of the rotating shaft rotating at a ratio of 1/2 to the rotation of the crankshaft and generating a predetermined cylinder identification signal SGC corresponding to each cylinder in advance; And the cylinder identification signal SGC between the crank angle reference position signal REF over a plurality of times of the crank angle reference position signal REF, and sequentially store the detected values as signal sequences. Further, the first storage means (S1 to 3) to be updated, the second storage means (10) for storing a predetermined reference signal sequence corresponding to each cylinder in accordance with the stroke order of the plurality of cylinders, and the first 1 storage means (S1 to 3) And a cylinder identifying means (S4 to 10) for identifying the cylinder by comparing the stored signal sequence with the reference signal sequence stored in the second storage means (10). The cylinder identification signal is set within the generation period of each crank angle reference position signal, and the width of the signal corresponding to the predetermined predetermined cylinder is the same and the width of the signal corresponding to the other cylinder. A cylinder identification device for an internal combustion engine, characterized by each of them being different. 3. The cylinder identification device of an internal combustion engine according to claim 2, wherein the width of the signal corresponding to the predetermined predetermined cylinder is approximately zero. The cylinder identification signal is set so that a width of a signal corresponding to a cylinder other than a predetermined cylinder is different from each other, and a crank angle reference signal is generated during the generation period of this signal. Cylinder identification device of internal combustion engines. The cylinder identification signal is set within the generation period of each crank angle reference position signal, and the number of signals corresponding to a predetermined predetermined cylinder is the same and the signal corresponding to the other cylinder is set. A cylinder identification device of an internal combustion engine, characterized by a different number. 6. The cylinder identification device of an internal combustion engine according to claim 5, wherein the number of signals corresponding to a predetermined predetermined cylinder is zero. The cylinder identification signal is set so that the number of signals corresponding to a cylinder other than a predetermined cylinder is different, and the crank angle reference position signal is generated during the generation period of this signal. Cylinder identification device of internal combustion engines.