JPH06146993A - Internal combustion engine controller - Google Patents

Abstract

PURPOSE:To provide an internal combustion engine controller, the size and the cost of which are reduced without impairing the accuracy of control reference point. CONSTITUTION:An internal combustion engine controller is provided with an angle signal issuance means 1 for forming an angle signal Ne corresponding to each specific crank angle, which is provided in relation to a crankshaft, a point signal issuance means 2A for forming a reference point signal Ttheta corresponding to each reference point of a plurality of cylinders, which is provided in relation to a 1/2 rotation shaft, and a control means 4A for controlling the engine based on each signal Ne and Ttheta, and the reference point signal comprises a plurality of pulses corresponding to each cylinder. Each pulse indicates a first reference point corresponding to initial ignition timing, and a second reference point, which is closer to a spark advance side compared with the first reference point, while the second reference point is different from either a specific cylinder or other cylinders, and a specific cylinder is discriminated by making comparison between a current value and a previous value of a segment determined by the first and the second reference points, by the control means.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention recognizes a cylinder to be controlled and its reference crank angle (reference position) on the basis of an angle signal and a reference position signal synchronized with the rotation of a crankshaft, and performs fuel injection and ignition for each cylinder. The present invention relates to an internal combustion engine control device that controls timing and the like, and more particularly to an internal combustion engine control device that realizes downsizing and cost reduction by simplifying signal generating means and a signal system for a reference position signal and the like.

[0002]

2. Description of the Related Art Generally, in an internal combustion engine such as an automobile engine, it is necessary to optimally control fuel injection and ignition timing according to operating conditions. For this reason, a microcomputer is used for recognizing a crank angle reference position for each cylinder, calculating an ignition timing and the like, and performing timer control from the reference position.

Further, in order to realize a highly accurate reference position that contributes to engine control, there has been proposed a control device using an angle signal generated for each predetermined crank angle in association with the rotation of the crankshaft. . In this case, together with the angle signal, a reference position signal corresponding to the initial ignition timing of each cylinder and a cylinder identification signal corresponding to the specific cylinder are generated, and these signals are input to the microcomputer.

FIG. 7 is a block diagram showing a conventional internal combustion engine control device, for example, a case where ignition control is performed for one of four cylinders. In the figure, 1
Is an angle signal generating means provided in association with the crankshaft of the engine, and generates an angle signal Ne corresponding to each predetermined crank angle in response to the rotation of the engine.

Reference numeral 2 is a reference position signal generating means provided in relation to the crankshaft, and generates a reference position signal T corresponding to the initial ignition timing of each cylinder. 3 is 1 / of the institution
Cylinder identification signal generating means provided in association with two rotation shafts, for example, a cam shaft, and a cylinder identification signal C corresponding to a specific cylinder.
To generate.

Reference numeral 4 is a control means composed of a microcomputer for controlling the engine on the basis of the angle signal Ne and the reference position signal T, and for each cylinder based on the angle signal Ne, the reference position signal T and the cylinder identification signal C. It recognizes the reference position, calculates the ignition timing and the like according to the operating conditions, and outputs the control signal (ignition coil energization cutoff signal) and the like corresponding to the ignition timing.

Reference numeral 5 is an ignition coil provided for each cylinder, 6 is an ignition plug connected to the secondary side of the ignition coil 5, and the primary winding of the ignition coil 5 is controlled by a control signal from the control means 4. By being driven, discharge ignition is performed in the spark plug 6 of the control target cylinder.

The control means 4 inputs the angle signals Ne, the reference position signal T and the cylinder identification signal C by waveform processing and takes in the input interfaces 41 to 43, and the signals Ne, T and C and the operating conditions of each cylinder based on the operating conditions. It comprises a timing control unit 44 for calculating the ignition timing and an output interface 45 for applying a control signal corresponding to the ignition timing to the ignition coil 5.

FIG. 8 is a perspective view schematically showing a configuration example of the angle signal generating means 1, the reference position signal generating means 2 and the cylinder identification signal generating means 3, and 10 is a crankshaft which rotates in synchronization with the engine rotation. , 11 are camshafts which are connected to the crankshaft 10 by a timing belt and rotate 1/2.

Reference numeral 1a designates a rotary plate fixed to the crankshaft 10 and having outer peripheral projections made of a magnetic material and having equal intervals. Reference numeral 1b designates an electromagnetic pickup arranged to face the outer peripheral projections of the rotary plate 1a. These are angle signal generating means. Make up one. Reference numeral 2a is a rotary plate fixed to the crankshaft 10 and having a pair of outer peripheral protrusions made of a magnetic material, and 2b is an electromagnetic pickup arranged opposite to the outer peripheral protrusions of the rotary plate 2a, which constitute the reference position signal generating means 2. is doing. 3a is a rotary plate fixed to the camshaft 11 and having one outer peripheral projection made of a magnetic material, and 3b is a rotary plate 3a.
The electromagnetic pickups are arranged to face each other, and these constitute a cylinder identification signal generating means 3.

FIG. 9 is a timing chart showing the waveforms of the angle signal Ne, the reference position signal T and the cylinder identification signal C. The angle signal Ne is composed of pulses generated at predetermined intervals θo of about 1 ° to 40 ° in crank angle, and is used as a highly accurate reference position. The reference position signal T includes a pulse corresponding to a crank angle of B5 ° (5 ° before TDC) of each cylinder, and is used for the initial ignition timing. The cylinder identification signal C is generated by one pulse for each rotation of the camshaft 11 in order to identify only a specific cylinder (for example, # 1 cylinder).

When the reference position signal T for four cylinders is converted into a crank angle, the total period for four cylinders is 720.
The pulse period for each cylinder is 180 °. Further, the cylinder identification signal C is generated at an arbitrary timing corresponding to the specific cylinder.

Next, referring to FIGS. 8 and 9, FIG.
The operation of the conventional internal combustion engine controller shown in FIG. When the engine rotates, the angle signal generation means 1, the reference position signal generation means 2 and the cylinder identification signal generation means 3 generate the angle signal Ne, the reference position signal T and the cylinder identification signal C as shown in FIG. 9, and the input interface. It is input to the timing control unit 44 in the control means 4 via 41 to 43.

The timing control unit 44 recognizes the reference position of each cylinder and each cylinder to be controlled based on the angle signal Ne, the reference position signal T and the cylinder identification signal C, and determines the ignition timing and the like according to the operating state D. The control timing is calculated and, for example, a control signal corresponding to the ignition timing is applied to the ignition coil 5 via the output interface 45. As the operating state D, load signals and temperature signals from various sensors (not shown) are used.

At this time, depending on the target ignition timing, the initial ignition timing B5 ° or an angle signal N on the advance side of B5 °
Timer control based on e is performed. Angle signal Ne
Is generated in association with the rotation of the crankshaft 10 and therefore does not include a rotation transmission error component, and is generated at each predetermined crank angle, so that it is highly accurate and arbitrary synchronized with the rotation of the crankshaft 10. Control based on the reference position becomes possible.

[0016]

As described above, the conventional internal combustion engine control system generates the control signal based on the three systems of the angle signal Ne, the reference position signal T and the cylinder identification signal C. There is a problem in that the generation means 1 to 3 become large-sized and three systems of input interfaces 41 to 43 are required, so that cost reduction cannot be realized.

The present invention has been made in order to solve the above problems, and an object thereof is to obtain an internal combustion engine control device which realizes downsizing and cost reduction without impairing the accuracy of the control reference position. .

[0018]

According to a first aspect of the present invention, there is provided an internal combustion engine control apparatus, which is provided in association with a crankshaft, and which generates an angle signal corresponding to a predetermined crank angle. Reference position signal generating means which is provided in association with the 1/2 rotation axis and generates a reference position signal corresponding to the reference position of each of the plurality of cylinders, and control means which controls the engine based on the angle signal and the reference position signal. And the reference position signal is composed of a plurality of pulses corresponding to each cylinder, and each pulse includes a first reference position corresponding to the initial ignition timing and a second reference position on the advance side of the first reference position. The second reference position is different between the specific cylinder and the other cylinder, and the control means sets the current value and the previous value of the time width of the section defined by the first and second reference positions. And compare this comparison result Is obtained so as to identify the specific cylinder by whether more than a predetermined value.

An internal combustion engine control device according to a second aspect of the present invention includes an angle signal generating means which is provided in relation to a crankshaft and generates an angle signal corresponding to each predetermined crank angle, and 1/2 rotation. A reference position signal generation unit that is provided in relation to the shaft and that generates a reference position signal corresponding to each reference position of the plurality of cylinders; and a control unit that controls the engine based on the angle signal and the reference position signal, The reference position signal is composed of a plurality of pulses corresponding to each cylinder, and each pulse has a first reference position corresponding to the initial ignition timing,
A second reference position on the advance side of the first reference position is shown, and the second reference position is different from each other for the specific cylinder and the other cylinder, and the control means is defined by the first and second reference positions. The time width of the first section and the time width of the second section defined by at least one of the first and second reference positions are compared, and the specific cylinder is determined depending on whether the comparison result is a predetermined value or more. Is to identify.

An internal combustion engine control device according to a third aspect of the present invention includes an angle signal generating means which is provided in association with the crankshaft and generates an angle signal corresponding to each predetermined crank angle, and 1/2 rotation. A reference position signal generation unit that is provided in relation to the shaft and that generates a reference position signal corresponding to each reference position of the plurality of cylinders; and a control unit that controls the engine based on the angle signal and the reference position signal, The reference position signal consists of a plurality of pulses corresponding to each cylinder, and each of the pulses is
The first reference position corresponding to the initial ignition timing and the first reference position
The second reference position on the advance side of the reference position is different from the second reference position with respect to the specific cylinder and the other cylinder, and the control means is defined by the first and second reference positions. The first comparison means for comparing the time width of the first section with the time width of the second section defined by at least one of the first and second reference positions, and the comparison result of the first comparison means. A second comparing means for comparing the current value and the previous value is included, and the specific cylinder is identified depending on whether or not the comparison result by the second comparing means is a predetermined value or more.

[0021]

According to the first aspect of the present invention, the reference position is recognized based on the angle signal, and the comparison result between the current value and the previous value of the pulse width of the reference position signal including the offset component for cylinder identification is a predetermined value. Cylinder identification is performed based on whether or not the above.

Further, according to a second aspect of the present invention, the reference position is recognized based on the angle signal, and the result of comparison between the pulse width of the reference position signal including the offset component for cylinder identification and the time width of other sections. Cylinder identification is performed based on whether or not is greater than or equal to a predetermined value.

Further, according to a third aspect of the present invention, the reference position is recognized based on the angle signal, and the pulse width of the reference position signal including the offset component for cylinder identification is compared with the time width of other sections. Then, the first comparison result is obtained, and cylinder identification is performed based on whether or not the comparison result between the current value and the previous value of the first comparison result is a predetermined value or more.

[0024]

【Example】

Example 1. Hereinafter, Example 1 of the present invention (corresponding to claim 1)
Will be described with reference to FIG. 1 is a block diagram showing a first embodiment of the present invention, in which 1, 41, 45, 5 and 6 are the same as those described above. Further, 2A, 4A, 42A and 44A correspond to the reference position signal generating means 2, the control means 4, the input interface 42 and the timing control section 44, respectively.

In this case, the reference position signal Tθ is composed of a plurality of pulses corresponding to each cylinder, and each pulse is a first reference position (for example, B5 °) corresponding to the initial ignition timing.
And a second reference position on the advance side of the first reference position. Here, the reference position signal Tθ is a rectangular wave that rises at the second reference position and falls at the first reference position.

Further, the second reference position indicated by the reference position signal T.theta. Is different between the specific cylinder and the other cylinder, and is set, for example, only on the specific cylinder on the advance side of the other cylinder. And Therefore, the rising timing of the reference position signal Tθ is offset only for the specific cylinder, and the pulse width is longer than the pulse widths for the other cylinders.

The control means 4A discriminates each cylinder and recognizes the reference position based on only two systems of the angle signal Ne and the reference position signal Tθ, and generates a control signal for the ignition coil 5, for example. Therefore, the cylinder identification signal generating means and the input interface for the cylinder identification signal are unnecessary.

FIG. 2 is a perspective view showing a structural example of the reference position signal generating means 2A, in which 12 is a rotary plate fixed to the cam shaft 11,
Reference numeral 13 is a rotary slit provided along the rotation direction of the rotary plate 12 and corresponding to another cylinder, and 14 is a rotary slit corresponding to a specific cylinder. Reference numeral 15 is a light emitting diode, and 16 is a light receiving element facing the light emitting diode 15 through the rotary plate 12, and these constitute a photocoupler facing the rotary slits 13 and 14.

FIG. 3 shows the angle signal Ne and the reference position signal Tθ.
Is a predetermined crank angle (about 1 ° to 40 °) corresponding to the cycle of the angle signal Ne, Tp is the pulse width of the reference position signal Tθ, and T180 is the fall of the reference position signal Tθ. The time width of the section (corresponding to a crank angle of 180 °), that is, the pulse period, B5 ° is the first reference position.

The reference position signal Tθ is composed of a number of pulses corresponding to the number of control cylinders, and the trailing edge of each pulse corresponds to the reference position B5 ° (initial ignition timing) of each cylinder. The shaded pulse in the reference position signal Tθ corresponds to the specific cylinder generated based on the rotary slit 14, and the rising timing (second reference position) is offset to the advance side. ing. Therefore, the pulse width Tp of the reference position signal Tθ for the specific cylinder is set longer than the pulse widths of the other cylinders.

Next, referring to FIGS. 2 and 3, FIG.
The operation of the first embodiment of the present invention shown in FIG.
When the engine rotates, the angle signal generating means 1 and the reference position signal generating means 2A generate the angle signal Ne and the reference position signal Tθ as shown in FIG. 3, and the timing in the control means 4A via the input interfaces 41 and 42A. Input to the control unit 44A.

That is, the angle signal generating means 1 is a crankshaft.
Each time the outer peripheral protrusion of the rotary plate 1a (see FIG. 8) integrated with 10 and the electromagnetic pickup 1b face each other, an angle signal Ne composed of a pulse having a predetermined crank angle cycle is generated. Further, the reference position signal generating means 2A outputs a pulse indicating H level by the slit length each time the rotary slits 13 and 14 in the rotary plate 12 integrated with the cam shaft 11 and the photocouplers 15 and 16 face each other. Then, the reference position signal Tθ is generated.

The control means 4A measures the pulse width (time width corresponding to the H level section) Tp of the reference position signal Tθ and compares it with the current value and the previous value of the pulse width Tp. Then, if it is determined that the current value Tp (n) is longer than the previous value Tp (n-1), the falling edge of the current pulse is set to the first value of the specific cylinder.
Is determined to be the initial ignition timing B5 °, and hereinafter, the trailing edge of the pulse of the sequentially generated reference position signal Tθ is determined to be the initial ignition timing of another cylinder.

For example, the difference between the current value and the previous value of the pulse width Tp (current value-previous value) is obtained as a comparison result, and this comparison result is further compared with a predetermined value. Since the value is longer than the previous value by the predetermined value or more, it can be determined that the pulse is for the specific cylinder this time.

A ratio (current value / previous value) may be used as the comparison result of the current value and the previous value of the pulse width Tp.
Further, the time widths (pulse widths) of the H level sections of the reference position signal Tθ are compared, but if the sections are defined by the first reference position B5 ° and the second reference position (rise), the L level section The current value and the previous value of the time width of may be compared.
Furthermore, the predetermined value that is the comparison reference with the comparison result for cylinder determination may be set in advance in the memory within the control means 4A, and may be appropriately updated by calculation based on the statistical average value of the comparison results. .

As a result, the timing control section 44A in the control means 4A calculates the ignition timing according to the operating state D, and the control signal for each cylinder is generated. At this time,
The angle signal Ne before and after each pulse of the reference position signal Tθ indicates a highly accurate crank angle for each cylinder. Therefore, by counting the number of pulses of the angle signal Ne as necessary, a highly accurate control reference position can be obtained. Can be used as

Further, in the cranking state at the time of starting, the rising and falling timings of each pulse of the reference position signal Tθ can be used as the energization and ignition timings at the initial time, respectively.

That is, the timing control unit 44 in the control means 4A
A recognizes the reference position of each cylinder and each cylinder to be controlled based on the angle signal Ne and the reference position signal Tθ, calculates a control timing such as ignition timing according to the operating state D, and performs control corresponding to the calculation result. Output a signal.

As described above, by adding the cylinder identification information (offset amount) to the reference position signal T.theta., An appropriate control for each cylinder can be made without degrading the reference position accuracy with a simple structure without using the cylinder identification signal. A signal can be generated, and highly reliable operation control becomes possible.

Example 2. Although the pulse width of the reference position signal Tθ for the specific cylinder is set longer than the pulse width for the other cylinder in the first embodiment, it may be set shorter than the pulse width for the other cylinder as shown in FIG. . Again 4
Although the case of cylinders has been described as an example, it is needless to say that the present invention can be applied to an internal combustion engine having an arbitrary number of cylinders.

Example 3. (Corresponding to Claim 2) In the first embodiment, the reference position signal Tθ for the specific cylinder is used.
The previous pulse width and the current pulse width were compared in order to detect the rising offset of the pulse. However, the time ratio corresponding to the pulse width of the reference position signal Tθ was calculated, and when this time ratio was equal to or greater than the predetermined value, the specific cylinder Offset may be identified. For example, the offset component can be detected based on the time width of the trailing edge of each pulse of the reference position signal Tθ, that is, the ratio of the pulse width Tp to the period T180 (Tp / T180).

That is, each pulse width Tp of the reference position signal Tθ
Is divided by a pulse period T180 corresponding to a crank angle of 180 ° to obtain a time ratio (Tp / T180) as a ratio result. If this time ratio is equal to or more than a predetermined value, the pulse is for a specific cylinder having a long pulse width Tp. I understand. The predetermined value in this case may be set in advance or may be calculated based on the average value, like the predetermined value in the first embodiment.

The value obtained by dividing the pulse width Tp of the reference position signal Tθ by the pulse period T180 is taken as the time ratio, but the value obtained by dividing the pulse width Tp by the time width of the L level section (T180-Tp) is taken as the time ratio. May be Moreover, the pulse width Tp in the H level section is not measured and the pulse width in the L level section is not measured.
The time ratio may be calculated with (T180-Tp) as the measurement target.

That is, in the third embodiment, the control means 4A is
As the time ratio, the time width (eg, pulse width Tp) of the first section defined by the first and second reference positions and the first width
And a time width of a second section (for example, a pulse cycle T180 or an L level section) defined by at least one of the second reference position and the second reference position, and the specific cylinder is selected depending on whether the comparison result is a predetermined value or more. It only has to be identified.

In this case, since the pulse width Tp has a normalized value, the time ratio becomes a constant value corresponding to, for example, the crank angle of the pulse width Tp, regardless of the engine speed, and the cylinder identification reliability. Is improved.

Example 4. (Corresponding to claim 3) In the third embodiment, the cylinder is identified only based on the current value of the time ratio of the pulses of the reference position signal Tθ, but the current value and the previous value of the time ratio are compared. Good. For example,
The deviation or ratio between the current time ratio and the previous time ratio is calculated, and when the time ratio deviation or ratio exceeds the specified value,
It can be determined that the current pulse is a pulse for a specific cylinder.

That is, the control means 4A defines the time width (eg, pulse width Tp) of the first section defined by the first and second reference positions and at least one of the first and second reference positions. The first comparison means for comparing the time width of the second section (for example, the pulse period T180) and the current value and the previous value of the comparison result (for example, Tp / T180) by the first comparison means. The second comparison means for comparing is included, and the specific cylinder is identified depending on whether or not the comparison result by the second comparison means is equal to or more than a predetermined value.

In this case, the fluctuation of the time ratio can be absorbed even during the sudden acceleration / deceleration of the operating condition.
The S / N ratio at the time of pulse width detection is improved, and the reliability of cylinder identification is further improved.

The predetermined value in this case is also the same as above.
It may be set in advance, or may be obtained by calculation based on a statistical average value. Also, as the first comparison result, the pulse width T
Although the time ratio between p and the pulse period T180 is used, the time difference between the two may be used.

Example 5. Further, in the third and fourth embodiments, the pulse width of only one specific cylinder is changed from that of the other cylinders in order to identify the cylinder based on the time ratio of each pulse of the reference position signal Tθ. Thus, the pulse width may be different for each cylinder. In this case, since each cylinder can be uniquely specified according to the value of the time ratio regarding each pulse, the time required for cylinder identification is shortened.

Example 6. Further, in the first embodiment, as shown in FIG. 3, each pulse of the reference position signal Tθ is generated between a pair of adjacent pulses of the angle signal Ne, but only the pulse for the specific cylinder is the angle signal Ne. It may include at least one pulse.

In this case, the control means 4A reads the level of the reference position signal Tθ every time a pulse of the angle signal Ne is generated, and the reference position signal Tθ immediately after it is determined to be at the H level.
Is determined as the initial ignition timing of the specific cylinder. Therefore, the cylinder can be identified based on the presence or absence of the overlap between the pulse of the angle signal Ne and the pulse of the reference position signal Tθ, and it is not necessary to compare with the previous pulse width.

Example 7. Further, in the sixth embodiment, only the pulse of the reference position signal Tθ for the specific cylinder includes the pulse of the angle signal Ne, but the pulse of the reference position signal Tθ includes the angle signal Ne having a different pulse number for each cylinder. You may choose not to.

For example, the pulse of the reference position signal Tθ not including the pulse of the angle signal Ne, the pulse of the reference position signal Tθ including one pulse of the angle signal Ne, and the angle signal N
Each cylinder can be individually recognized by setting a pulse of the reference position signal Tθ including two pulses of e and a pulse of the reference position signal Tθ including three pulses of the angle signal Ne. it can.

In this case, a register is provided in the control means 4A, and every time each pulse of the angle signal Ne is generated, the level of the read reference position signal T.theta. The reference position signal T immediately after being recognized
The pulse rise of θ can be determined as the initial ignition timing of the identified cylinder. Therefore, even if the pulse of the reference position signal Tθ for one specific cylinder is not detected, the cylinder identification can be completed in a short period of time.

Example 8. Further, in each of the above embodiments, FIG.
As described above, as the reference position signal generating means 2A, the rotary slits 13 and 14 and the photocouplers 15 and 16 in the rotary plate 12 are used to generate the reference position signal Tθ composed of a rectangular wave pulse. A configuration using a pickup may be used, and pulse trains respectively corresponding to rising and falling of the reference position signal Tθ may be generated.

FIG. 6 shows an eighth embodiment of the present invention in which the reference position signal T.theta. Is generated based on the reference position pulse T '.
5 is a waveform diagram for explaining FIG. In this case, the reference position pulse T'is obtained from the electromagnetic pickup facing the outer circumferential protrusion of the rotary plate provided integrally with the cam shaft 11, and is generated in response to the rising and falling of the reference position signal Tθ.

The reference position signal Tθ is obtained by shaping the reference position pulse T '. For example, the time corresponding to each interval of the three reference position pulses T ′ is measured and compared, and the section corresponding to the short time is referred to as the reference position signal Tθ.
Can be regarded as the H level section of each pulse. or,
The waveform shaping means can be incorporated in the reference position signal generating means 2A or the control means 4A.

As described above, the cost can be further reduced by generating the reference position signal Tθ using the electromagnetic pickup which is cheaper than the optical sensor.
Further, as for the configuration of the eighth embodiment, the second to seventh embodiments
It goes without saying that the various aspects described in 1 above are also applicable.

[0060]

As described above, according to the first aspect of the present invention, the angle signal generating means is provided in association with the crankshaft and generates the angle signal corresponding to each predetermined crank angle.
/ 2 reference axis signal generating means for generating reference position signals corresponding to respective reference positions of a plurality of cylinders, and a control means for controlling the engine based on the angle signal and the reference position signal. The reference position signal is composed of a plurality of pulses corresponding to each cylinder, and each of the pulses includes a first reference position corresponding to the initial ignition timing and a second reference position on the advance side of the first reference position. The second reference position is different from each other with respect to the specific cylinder and the other cylinder, and the control means sets the current value and the previous value of the time width of the section defined by the first and second reference positions. Since the comparison is made and the specific cylinder is identified based on whether or not the comparison result is a predetermined value or more, the sensor system can be reduced to two systems and the number of input interfaces of the control means can be reduced, which impairs the accuracy of the control reference position. Without There is an effect that an internal combustion engine controller that realizes downsizing and cost reduction can be obtained.

According to claim 2 of the present invention, the angle signal generating means for generating an angle signal corresponding to each predetermined crank angle, which is provided in relation to the crankshaft, is related to the 1/2 rotary shaft. And a reference position signal generating means for generating a reference position signal corresponding to each reference position of the plurality of cylinders,
And a control means for controlling the engine based on the angle signal and the reference position signal, wherein the reference position signal is composed of a plurality of pulses corresponding to each cylinder, each pulse being a first reference corresponding to an initial ignition timing. Position and a second reference position on the advance side of the first reference position. The second reference position is different between the specific cylinder and the other cylinder, and the control means sets the first and second reference positions. The time width of the first section defined by the position is compared with the time width of the second section defined by at least one of the first and second reference positions, and whether or not the comparison result is a predetermined value or more. Since the specific cylinder is identified by the above, the number of sensor systems can be reduced to two and the number of input interfaces of the control means can be reduced, so that downsizing and cost reduction can be realized without impairing the accuracy of the control reference position, and the communication can be reduced. The effect of the internal combustion engine control apparatus having improved sexual obtain.

According to claim 3 of the present invention, the angle signal generating means for generating an angle signal corresponding to each predetermined crank angle, which is provided in relation to the crankshaft, is related to the 1/2 rotation shaft. And a reference position signal generating means for generating a reference position signal corresponding to each reference position of the plurality of cylinders,
Control means for controlling the engine on the basis of the angle signal and the reference position signal, the reference position signal is composed of a plurality of pulses corresponding to each cylinder, each pulse being a first reference position corresponding to an initial ignition timing. And a second reference position that is more advanced than the first reference position. The second reference position is different for a specific cylinder and another cylinder, and the control means
A first comparison for comparing a time width of a first section defined by the first and second reference positions with a time width of a second section defined by at least one of the first and second reference positions. Means and second comparing means for comparing the current value and the previous value of the comparison result by the first comparing means, and the specific cylinder is identified by whether or not the comparison result by the second comparing means is a predetermined value or more. As a result, the number of sensor systems can be reduced to two and the number of input interfaces of the control means can be reduced, so that downsizing and cost reduction can be realized without impairing the accuracy of the control reference position, and reliability can be further improved. There is an effect that the internal combustion engine control device can be obtained.

[Brief description of drawings]

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

FIG. 2 is a perspective view showing a specific structure of a reference position signal generating means in FIG.

FIG. 3 is a waveform diagram showing an angle signal and a reference position signal generated according to the first embodiment of the present invention.

FIG. 4 is a waveform diagram showing an angle signal and a reference position signal generated according to the second embodiment of the present invention.

FIG. 5 is a waveform diagram showing an angle signal and a reference position signal generated according to the fifth embodiment of the present invention.

FIG. 6 is a waveform diagram showing an angle signal, a reference position pulse, and a reference position signal generated according to Embodiment 8 of the present invention.

FIG. 7 is a block diagram showing a conventional internal combustion engine controller.

8 is a perspective view schematically showing specific structures of an angle signal generating means, a reference position signal generating means and a cylinder identifying signal generating means in FIG.

FIG. 9 is a waveform diagram showing an angle signal, a reference position signal, and a cylinder identification signal generated by a conventional internal combustion engine controller.

[Explanation of symbols]

 1 angle signal generating means 2A reference position signal generating means 4A control means 44A timing control section 11 cam shaft (1/2 rotation axis) Ne angle signal Tθ reference position signal θo predetermined crank angle B5 ° initial ignition timing (first reference position ) Tp pulse width T180 pulse period

Claims (3)

[Claims] 1. A crankshaft of an engine, which is provided in association with
Angle signal generating means for generating an angle signal corresponding to each predetermined crank angle, and a reference provided in association with the ½ rotation shaft of the engine for generating a reference position signal corresponding to each reference position of a plurality of cylinders. Position signal generating means, and a control means for controlling the engine based on the angle signal and the reference position signal, the reference position signal consists of a plurality of pulses corresponding to each cylinder, each of the pulses Indicates a first reference position corresponding to the initial ignition timing and a second reference position on the advance side of the first reference position. The second reference position is a specific cylinder and another cylinder. With respect to each other, the control means compares the current value and the previous value of the time width of the section defined by the first and second reference positions, and determines whether the comparison result is a predetermined value or more. Identify cylinder An internal combustion engine control apparatus according to claim Rukoto. 2. Provided in association with the crankshaft of an engine,
Angle signal generating means for generating an angle signal corresponding to each predetermined crank angle, and a reference provided in association with the ½ rotation shaft of the engine for generating a reference position signal corresponding to each reference position of a plurality of cylinders. Position signal generating means, and a control means for controlling the engine based on the angle signal and the reference position signal, the reference position signal consists of a plurality of pulses corresponding to each cylinder, each of the pulses Indicates a first reference position corresponding to the initial ignition timing and a second reference position on the advance side of the first reference position. The second reference position is a specific cylinder and another cylinder. With respect to each other, the control means controls the second section defined by at least one of the time width of the first section defined by the first and second reference positions and the first section and the second reference position. time of DOO compare, a control apparatus for an internal combustion engine this comparison result, wherein the identifying the specific cylinder based on whether more than a predetermined value. 3. Provided in association with the crankshaft of the engine,
Angle signal generating means for generating an angle signal corresponding to each predetermined crank angle, and a reference provided in association with the ½ rotation shaft of the engine for generating a reference position signal corresponding to each reference position of a plurality of cylinders. Position signal generating means, and a control means for controlling the engine based on the angle signal and the reference position signal, the reference position signal consists of a plurality of pulses corresponding to each cylinder, each of the pulses Indicates a first reference position corresponding to the initial ignition timing and a second reference position on the advance side of the first reference position. The second reference position is a specific cylinder and another cylinder. With respect to each other, the control means controls the second section defined by at least one of the time width of the first section defined by the first and second reference positions and the first section and the second reference position. time of And a second comparison means for comparing the current value and the previous value of the comparison result by the first comparison means, and the comparison result by the second comparison means is predetermined. An internal combustion engine control device, wherein the specific cylinder is identified based on whether the value is equal to or more than a value.