JPH0968089A - Signal generating position detecting method of pulse signal generator to control internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect a generating position of pulse signals generated by a pulse signal generator to control an internal combustion engine where a signal power generating piece is installed on a baseplate to be rotatably operated at all times. SOLUTION: Among a zero point of output voltage Ve of an exciter coil to generate AC voltage in synchronism with rotation of an internal combustion engine, a specific zero point whose position to the upper dead center TDC is known is set as a reference position θb1. Among positive-negative pulse signals Vs1 and Vs2 generated by a signal generator, one signal Vs1 is set as a detecting object pulse signal. When respective detecting object pulse signals Vs1 are generated, an angle β1 between a generating position θo of its detecting object pulse signals and a reference position θb1 is detected, and an absolute position to the upper dead center TDC of the detecting object pulse signals Vs1 is detected from this angle β1 and the reference position b1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a case where a signal generating electron generating a pulse signal used for controlling an internal combustion engine is attached to a base plate which is operated to rotate at any time.
The present invention relates to a method for detecting an absolute position of a pulse signal generation position.

[0002]

2. Description of the Related Art In an internal combustion engine, when the ignition position is controlled or the fuel injection amount is controlled, information on a specific rotational angle position of the engine is set in order to determine the position where the measurement of the control amount is started. I need. For example, when controlling the ignition position of the engine by using a microcomputer, the rotation angle position having a fixed relationship with the fixed position such as the top dead center of the engine is detected as the measurement start position, and the measurement start position is detected. When the ignition position is detected, measurement of the ignition position calculated for various control conditions is started, and an ignition signal (a signal for triggering the ignition circuit) is sent to the ignition circuit when the calculated ignition position is measured. I give it and make it perform an ignition operation.

When the fuel injection amount is controlled by controlling the fuel injection time by using a microcomputer, a specific rotational angle position of the engine is detected as the fuel injection time measurement start position, and From the time when the measurement start position is detected, a fuel injection is performed by giving an injection command signal to the injector during the fuel injection time calculated for various control conditions.

Therefore, in a control device for controlling the ignition position and the like of an internal combustion engine, a signal generator that generates a pulse signal at a specific rotational angle position of the engine is attached to the engine,
By detecting the pulse signal obtained from the signal generator, the measurement start position of the control amount of various controls is obtained.

The signal generator used for this type of purpose is
The rotor is provided so as to rotate synchronously with the engine, and a signal generator that detects a change in magnetic flux generated by a reluctor provided in the rotor and generates a pulse signal.

In many internal combustion engines at present, a signal generating electron is fixed to a mounting portion provided in a crankcase of the engine or the like, and a pulse signal is always generated from the signal generating electron at a constant rotation angle position. The control position is set to the measurement start position of various control amounts to perform various controls.

However, in an internal combustion engine that is used in a special way, a signal generator is attached to a base plate that is rotated at any time, and the base plate is rotated while the engine is operating, so that the signal generator emits a pulse signal. In some cases, the position at which the pulse signal is generated cannot be directly used as the measurement start position for various controls.

For example, an outboard motor may be operated for a long time at a rotational speed close to an idling state during trolling, or may be kept in a high speed rotational state for a long time in order to maintain a high cruising speed. Therefore, the signal generator is attached to the base plate that is installed to rotate in conjunction with the change in the opening of the throttle valve of the engine, and the pulse signal of the pulse signal is changed according to the change in the opening of the throttle valve. By changing the generation position,
We try to respond to changes in driving conditions.

As described above, when the signal emitting electrons are attached to the base plate which is rotated at any time, since it is intended to change the ignition position in accordance with the rotation of the base plate, the signal emitting electrons are generated. It is common to use the pulse signal itself as the ignition signal. Therefore, in the conventional internal combustion engine in which the generation position of the pulse signal is changed by the rotation of the base plate, the ignition position is not controlled by using a microcomputer, etc. Emissions were attached so that ignition was performed when each signal emission generated a pulse signal.

However, the ignition position of the internal combustion engine does not have to be controlled with respect to the opening of the throttle valve, and even in the internal combustion engine in which the ignition position is changed according to the change of the opening of the throttle valve. , It may be necessary to control the ignition position according to yet other conditions. For example, in an outboard motor, it may be desirable to perform an ignition operation at a position that is more advanced than a pulse signal generation position determined by the position of the base plate when the engine is started. In that case, the absolute position of the position where the pulse signal generated by the signal generator is generated (the position where the pulse signal is generated with respect to the top dead center of the engine or a position that is a constant angle away from the top dead center, etc. Detect and
It is necessary to generate an ignition signal at a position that is further advanced from that position.

When controlling the fuel injection amount,
It is preferable to start the fuel injection at a specific rotation angle position related to the stroke of the engine, instead of starting the fuel injection at the position where the pulse signal changes with the rotation of the base plate. In order to obtain the fuel injection start position, it is necessary to detect the absolute position of the pulse signal generation position and calculate the injection time measurement start position from the absolute position.

[0012]

When the signal generator of the signal generator is fixed to the crankcase or the like of the engine, the signal generator always generates a pulse signal at a constant rotational angle position. Therefore, the generation position of the pulse signal can be used as it is as the measurement start position of the ignition position or as the fuel injection start position.

However, in the case where the signal generator for generating the pulse signal is attached to the base plate which can be rotated at any time like the outboard motor, the pulse signal is generated in accordance with the rotation of the base plate. Since the position changes, the generation position of the pulse signal obtained from the signal emitting electron cannot be used as it is as the measurement start position of various control amounts.

Also in the outboard motor and the like, the base plate to be rotated is abolished, and the signal generator is fixed to the crankcase of the engine to generate a pulse signal at a constant position at all times. By controlling the ignition position with respect to the throttle opening by using a microcomputer, various controls can be performed with the pulse signal generation position itself as a reference position.
However, in order to abolish the base plate, it is necessary to change the model of the engine, and it is necessary to newly provide a means for detecting the opening degree of the throttle valve, which causes an increase in cost. Inevitable. Therefore, without changing the model of the engine, various control by the microcomputer is performed by detecting the absolute position of the generation position of the pulse signal while the signal generating electron is still attached to the rotating base plate. It is preferable to be able to set.

Further, when the signal generators are attached to the base plate which can be rotated at any time, conventionally, the signal generators are provided as many as the number of cylinders of the engine, and each signal is generated by a pulse signal generated by the signal generators corresponding to each cylinder. Although the ignition position of the cylinder is determined, if the signal-generating electrons for the number of cylinders are provided, the structure of the signal generator becomes complicated and the cost becomes unavoidable.

In the case of an even-cylinder two-cycle engine, a so-called simultaneous ignition system is adopted in which spark plugs of two cylinders are connected to one ignition coil and sparks are simultaneously generated in the spark plugs of the two cylinders. By doing so, the number of signal emitting electrons can be reduced to 1/2 of the number of cylinders, but even in that case, an internal combustion engine having four or more cylinders requires two or more signal emitting electrons.

On the other hand, if it is possible to detect the absolute position of the generation position of the pulse signal obtained from the signal generating electron provided for one cylinder, the other cylinders based on the generation position of the pulse signal. Since the ignition position can be determined, the ignition position of the internal combustion engine having a plurality of cylinders can be determined by providing only one signal generating electron, and the structure of the signal generator can be simplified.

An object of the present invention is to provide a pulse signal generating device for controlling an internal combustion engine in which a signal generator is attached to a base plate which is operated to rotate at any time, so as to detect the position where the pulse signal is generated. An object of the present invention is to provide a generation position detection method.

[0019]

SUMMARY OF THE INVENTION The present invention is directed to a rotor provided so as to rotate synchronously with a crankshaft of an internal combustion engine, and a rotor provided around the rotor so as to be rotatable by a predetermined angle. A pulse signal generator for controlling an internal combustion engine, which is mounted on a base plate which is dynamically operated, and which detects a change in magnetic flux generated by a rotor and generates a positive and negative pulse signal once per revolution. And a signal generation position detecting method for detecting a generation position of a pulse signal to be generated.

In the present invention, a magneto generator that generates an AC voltage in synchronization with the rotation of the internal combustion engine is attached to the internal combustion engine, and the output of the magneto generator shifts from a negative half cycle to a positive half cycle. A zero point generated at this time or a specific zero point among the zero points generated when the output of the generator shifts from the positive half cycle to the negative half cycle is set to be detected as the known reference position θb1. Then, the pulse signal of either one of the positive pulse signal and the negative pulse signal generated by the signal generator is the detection target pulse signal,
Each time each detection target pulse signal is generated, the time T from the generation of each detection target pulse signal to the detection of the reference position θb1 is detected, and the time T [sec] and the rotation speed N [] at that time are detected. rpm] and the angle β between the generation position of each detection target pulse signal and the reference position β = (N / 60) × (T ×
360) is calculated. This angle β and a known reference position θb1
From the above, the generation position of each detection target pulse signal with respect to the specific rotation angle position of the engine is obtained.

Position of the zero point generated when the output of the magnet generator changes from the negative half cycle to the positive half cycle or the zero point generated when the output of the generator changes from the positive half cycle to the negative half cycle Is basically determined by the mechanical configuration of the magneto generator, so by using the position of a specific zero point as a known reference position, the absolute position of the generation position of the pulse signal to be detected (for example, the top dead center of the engine) Alternatively, it is possible to detect a generation position) with respect to a fixed position that is apart from the top dead center by a predetermined angle.

In the method of the present invention, in order to reduce the detection error of the generation position of the pulse signal to be detected, the zero point used as the reference position is selected as a zero point which has the least variation due to the armature reaction of the magnet generator. Is desirable.

The generation position of each detection target pulse signal can be obtained by performing the calculation using the above equation each time each detection target pulse signal is detected. However, the generation position of each detection target pulse signal is detected. In order to reduce the time required for the
The relationship between the time T until b1 is detected, the rotation speed N at that time, and the generation position of the detection target pulse signal with respect to the specific rotation angle position of the engine is measured in advance by a bench test,
A pulse signal generation position calculation map that gives the relationship between the time T, the rotation speed N, and the generation position of the detection target pulse signal is created, and each detection target pulse is detected each time the detection target pulse signal is detected. Reference position θ after signal is detected
The time T until the detection of b1 and the rotation speed N at that time are detected, and the generation position of each detection target pulse signal is obtained using the detected time T, the rotation speed N and the map. Is good.

In the above method, the generation position of each detection target pulse signal is calculated by measuring the time from the generation of the detection target pulse signal to the detection of the reference position and the rotation speed. However, a position detection pulse generator that generates a position detection pulse each time the internal combustion engine rotates a minute angle is provided, and the position where each detection target pulse signal is generated is detected by counting the position detection pulses. You may

In this case, every time each detection target pulse signal is generated, the position detection pulses are counted from the time each detection target pulse signal is generated until the reference position is detected, and the count value is counted. The angle β between the generation position of each detection target pulse signal and the reference position is calculated from Q, and the generation position of each detection target pulse signal for a specific rotation angle position of the engine is obtained from this angle β and the reference position θb1. .

Also in this case, the count value of the position detection pulse counted from the time when each detection target pulse signal is generated until the reference position is detected and each detection target pulse for a specific rotation angle position of the engine A pulse signal generation position calculation map that gives a relationship with the signal generation position is created, and each time each detection target pulse signal is detected, the reference position is set after the detection target pulse signal is detected. It is preferable to count the position detection pulses generated before the detection and use the count value Q and the pulse signal generation position calculation map to determine the generation position of each detection target pulse signal. .

As described above, according to the method of the present invention, when the signal generator for generating the pulse signal is attached to the base plate which is rotated at any time, the base plate can be rotated at any position. , Because it is possible to detect the absolute position of the pulse signal generation position, from the detected pulse signal generation position to the specific rotation angle position of the engine (for example, top dead center) or the specific rotation angle position It is possible to obtain a position having a certain relationship by calculation and use that position as the measurement start position for various control amounts. Therefore, even when the signal generator is attached to the base plate that is rotated at any time, various controls can be performed using the microcomputer.

Further, when the signal-generating electrons are attached to the base plate which is rotated at any time, the position where the signal-generating electrons generate a pulse signal includes information on the rotation angle of the base plate. When the base plate is rotated in association with the throttle valve, the position where the pulse signal is generated includes the opening information of the throttle valve. Therefore, when the signal generation device is attached to the base plate that interlocks with the throttle valve and the generation position of the pulse signal is detected by the method of the present invention, the rotation for obtaining the measurement start position of various control amounts is performed. In addition to the angular position information, the throttle valve opening information can be obtained. for that reason,
Even if a sensor for detecting the opening of the throttle valve is not provided, the fuel injection time and the like can be controlled according to the opening of the throttle valve.

[0029]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a circuit diagram showing a configuration example of hardware used for carrying out the present invention, and FIG. 2 shows a configuration example of a magnet generator used for carrying out the present invention. It is a block diagram. In FIG. 1, reference numeral 1 is a capacitor discharge type ignition circuit used to ignite an internal combustion engine. Generally, a capacitor discharge type ignition circuit is for storing ignition energy which is charged to one polarity by an ignition coil and an exciter coil provided in a magnet generator provided on the primary side of the ignition coil and rotating synchronously with an engine. A capacitor, a thyristor provided to discharge the electric charge of the capacitor to the primary coil of the ignition coil when conducting, and an ignition position control device that gives an ignition signal to the gate of the thyristor at the ignition position of the engine Composed.

In the illustrated ignition circuit 1, one ends of the primary coil W1 and the secondary coil W2 of the ignition coil IG are grounded, and one end of the ignition energy storage capacitor C1 is connected to the non-grounded side terminal of the primary coil W1 of the ignition coil IG. Are connected. A thyristor Th is connected between the other end of the capacitor C1 and the ground with the cathode facing the ground side, and when the thyristor Th conducts, the charge of the capacitor C1 is discharged through the primary coil W1 of the ignition coil IG. Has become. The other end of the capacitor C1 is connected to the cathode of the diode D1 and the anode of the diode is connected to one end of an exciter coil 2 provided in the magneto generator. Moreover, at both ends of the primary coil of the ignition coil IG,
A diode D2 with its cathode facing the ground is connected.

The other end of the exciter coil 2 is connected to the cathode of a diode D3 whose anode is grounded, and a diode D4 with its anode facing the ground side is connected between one end of the exciter coil 2 and ground.

In the illustrated example, an exciter coil 2 is provided in a 12-pole magnet generator provided so as to rotate synchronously with an internal combustion engine, and the exciter coil 2 is provided in FIG.
As shown in (A), the AC voltage Ve of 6 cycles per one revolution of the engine is induced, and each time the exciter coil 2 generates an induced voltage of each positive half cycle,
Exciter coil 2 → diode D1 → capacitor C1
In the path of the diode D2 and the primary coil W1 of the ignition coil, the diode D3 and the exciter coil 2, the ignition energy storage capacitor C1 is charged to the polarity shown in the figure.

In the ignition circuit 1 shown, the positive half cycle output of the exciter coil 2 charges the capacitor C1 to the polarity shown. Thyristor T at the engine ignition position
When the ignition signal Vi is applied to the gate of h, the thyristor becomes conductive and discharges the electric charge of the capacitor C1 to the primary coil of the ignition coil. This causes a large magnetic flux change in the iron core of the ignition coil, which induces a high ignition voltage in the secondary coil of the ignition coil. Since this high voltage is applied to the spark plug P attached to the cylinder of the engine, a spark is generated in the spark plug P and the engine is ignited.

The microcomputer 3 is used to control the ignition position of the internal combustion engine, and the ignition signal Vi obtained at the output port of the CPU of the microcomputer 3 is supplied to a thyristor via a predetermined interface circuit (not shown). It is supplied to the Th gate.

In order to obtain information on the rotational angle position of the engine, a pulse signal generator for controlling the internal combustion engine is provided, and the pulse signal obtained from the signal coil Ls provided in the signal generator 4 of the pulse signal generator is generated. Microcomputer 3
Has been given to. As shown in FIG. 3 (C) or (E), the signal coil Ls generates a positive pulse signal Vs1 and a negative pulse signal Vs2 once during one revolution of the engine.

In the present invention, the pulse signal having one of the positive and negative pulse signals generated by the signal coil Ls is used as the detection target pulse signal. In this example, the positive pulse signal Vs1 is the detection target pulse signal.

As will be described later, since the signal generator 4 is attached to the base plate provided so as to rotate in association with the change in the throttle opening, the pulse signal V
The positions where s1 and Vs2 are generated change as the throttle opening changes.

In the illustrated example, one end of the signal coil Ls is connected to the cathode of the diode D5 whose anode is grounded, and the positive pulse of the positive and negative polarity pulse signals Vs1 and Vs2 induced in the signal coil Ls. The signal Vs1 is input to the microcomputer 3 through the waveform shaping circuit 5. In this example, since the microcomputer 3 recognizes the fall of the voltage from the high level to the low level as a signal, the waveform shaping circuit 5 operates as shown in FIG.
As shown in (D) or (F), when the positive pulse signal Vs1 reaches a predetermined threshold value, it falls from a high level to a low level, and when the pulse signal Vs1 becomes lower than the threshold value. A signal Vs' that rises to a high level is output.

In order to obtain the reference position for detecting the generation position of the pulse signal Vs1, the output voltage of the exciter coil 2 is converted into a rectangular wave signal by the waveform shaping circuit 6 and input to the microcomputer 3. As shown in FIG. 3 (B), the illustrated waveform shaping circuit 6 outputs a rectangular wave signal Vq that maintains a high level during the period when the negative half cycle voltage of the exciter coil 2 is generated. Therefore, the microcomputer 3 detects the falling edge of the rectangular wave signal Vq to detect the exciter coil 2
Detects the zero that occurs when the output of goes from the negative half cycle to the positive half cycle. In this example, since the magneto-generator provided with the exciter coil 2 has 12 poles, six zero points θb1 to θb6 are detected per rotation, and the angular interval (mechanical angle) α between the zero points is detected. Is equal to 60 degrees. In the present invention, the zero point θb1 which is first detected after the signal generating electron 4 generates the detection target pulse signal Vs1 is used as the known reference position.

Therefore, the variation range of the generation position of the detection target pulse signal Vs1 caused by the rotation of the base plate is detected at the zero point (reference position) θb1 detected by the output voltage of the exciter coil 2 and one position before that. Zero point θ
The phase relationship between the output voltage of the exciter coil 2 and the output pulse signal of the signal generator 4 is set so as to be within the section between b6 and (the section of the angle α shown in FIG. 3). That is, a zero point (reference position) detected after the detection target pulse signal Vs1 is generated regardless of the rotation angle of the base plate to which the signal generator 4 is attached.
The phase relationship between the output voltage of the exciter coil 2 and the output pulse signal of the signal generator 4 is set so that the mechanical position of θb1 is the same.

FIG. 2 shows an example of the configuration of a magnet generator provided with the exciter coil 2 and a signal generator provided with the signal generator 4. 2 in FIG.
Is a cup-shaped iron flywheel in which twelve permanent magnets M1 to M12 are attached at intervals of 30 degrees on the inner periphery of the peripheral wall portion 10a of the flywheel. These magnets are magnetized in the radial direction with alternating polarities so that the S poles and the N poles are alternately arranged in the circumferential direction of the flywheel, and the flywheel 10 and the magnets M1 to M12 are magnetized.
A magnet rotor 11 having 12 poles is constituted by and. An iron boss 1 is provided at the center of the bottom wall of the flywheel 10.
0b is provided, and the boss portion 10b is fitted to the crankshaft 12 of the engine (not shown).

A stator formed by winding a generator coil including the exciter coil 2 around an armature iron core is fixed to a stator mounting portion (not shown) provided on a crankcase of an internal combustion engine, and is provided on the iron core of the stator. The magnetic pole portion is opposed to the magnetic pole of the magnet rotor 11 with a predetermined gap.

Further, in this example, the reluctor 13a consisting of a projecting portion having a polar arc angle (arc angle) of 180 degrees is formed on the outer periphery of the boss portion 10b of the flywheel 10, and the boss portion 10b in which the reductor is formed is formed. The rotor 13 of the signal generator is configured.

An annular base plate 14 is rotatably provided so as to concentrically surround the rotor 13. The base plate 14 is supported in a state in which the base plate 14 is slidably abutted on an abutting surface provided on the case of the engine, and a stopper pin 15 fixed to the abutting surface has an arc shape provided on the base plate 14. The rotation range of the base plate 14 is regulated by being fitted into the long hole 14a and engaging the long hole 14a and the stopper pin 15. The base plate 14 is connected to a throttle lever via a connecting mechanism (not shown), and is rotated with the displacement of the throttle lever. In the illustrated example, the rotation range of the base plate 14 is limited to 60 degrees or less.

On the base plate 14, the signal generator 4 which constitutes the pulse signal generator together with the rotor 13 is attached. The signal-generating electron 4 is a well-known one having an iron core 4a having a magnetic pole portion facing the reluctor 13a at its tip, a signal coil Ls wound around the iron core, and a magnet 4b magnetically coupled to the iron core 4a. . In this signal generator, the magnetic path of the magnet 4b → the iron core 4a → the rotor 13 → the base plate 14 → the magnet 4b is constituted, and the reluctor 13 is formed.
When a starts to face the magnetic pole portion of the iron core 4a and when the facing ends, a change in the magnetic flux generated in the iron core 4a induces a positive pulse signal Vs1 and a negative pulse signal Vs2 in the signal coil Ls. It is supposed to do.

The polarities of the pulse signals Vs1 and Vs2 differ depending on the winding direction of the signal coil Ls.
When reversing the winding direction of the
Of the negative polarity pulse signal Vs1 and the positive polarity pulse signal Vs2 in the signal coil Ls due to the change in the magnetic flux generated in the iron core 4a at the time of starting the facing of the magnetic pole portion of and the ending of the facing. .

In the generator shown in FIG. 2, the ring gear 16 is also provided on the outer circumference of the peripheral wall portion 10a of the flywheel 10.
Is fitted and the signal generator 4 ′ is opposed to the ring gear 16. The signal emitting electron 4 ′ is the signal emitting electron 4 ′.
Which has the same structure as the above, and which is magnetically coupled to the iron core 4a 'having a magnetic pole portion facing the teeth of the ring gear 16 at the tip, a signal coil Ls' wound around the iron core, and the iron core 4a'. With the magnet 4b ', positive and negative pulse signals are generated in the signal coil Ls' due to changes in the magnetic flux generated in the iron core 4a' by the teeth of the ring gear 16. In the present invention, one of the positive and negative pulse signals generated by the signal coil Ls' (for example, a positive pulse) is used as the position detection pulse. FIG. 3G shows the position detection pulse Vp, which is the number of teeth of the ring gear K.
Then, the pulse V is generated every 360 / K degrees.
By counting p, the rotation angle of the engine can be measured. Approximately 360 / K for a typical ring gear
= 3.2 degrees.

In this example, a pulse signal generator for controlling an internal combustion engine for generating a pulse signal for obtaining a control amount measurement start position when controlling the ignition position by the rotor 13 and the signal generator 4 is used. Composed of ring gear 1
6 and the signal generator 4'constitute a position detecting pulse generator for generating a position detecting pulse for detecting the rotational angle position of the engine.

The ring gear 16 is originally provided for driving the crankshaft 12 by engaging a pinion gear driven by a starting electric motor when the engine is started.

Next, the signal generating position detecting method of the present invention using the above apparatus will be described. In the present invention, the zero point generated when the output of the magneto generator that generates the AC voltage in synchronization with the rotation of the internal combustion engine shifts from the negative half cycle to the positive half cycle, or the output of the generator is the positive half cycle. A specific zero point among the zero points generated when the cycle shifts to the negative half cycle is detected as the known reference position θb1.

In this embodiment, the microcomputer 3
Thus, by detecting the falling edge of the rectangular wave signal Vq, the zero point when the output voltage of the exciter coil 2 shifts from the negative half cycle to the positive half cycle is detected, and the detection target pulse signal ( The zero point θb1 which is first detected after the positive polarity pulse signal) Vs1 is detected is set as the reference position.

In the present invention, each time each detection target pulse signal Vs1 is generated, the time T from the generation of each detection target pulse signal to the detection of the reference position θb1 is detected, and this time T From the rotation speed N at that time, the angle β between the generation position of each detection target pulse signal and the reference position θb1 =
Calculate (N / 60) × (T × 360). Since the angle between a specific rotational angular position of the engine (for example, the top dead center of the engine or a set position separated from the top dead center by a certain angle) and the reference position θb1 is known, the angle β and the reference position θb1 are From this, it is possible to obtain the generation position of each detection target pulse signal with respect to the specific rotation angle position of the engine.

The generation position of each pulse signal Vs1 to be detected is
This can be obtained by performing the calculation using the above equation each time each detection target pulse signal is detected, but in order to shorten the time required to detect the generation position of each detection target pulse, each detection target pulse signal is detected. Time T from generation of pulse signal to detection of reference position θb1 and rotation speed N at that time
And the position of generation of the detection target pulse signal with respect to a specific rotation angle position of the engine are measured in advance by a bench test, and the relationship between the time T, the rotation speed N and the generation position of the detection target pulse signal is determined. A given pulse signal generation position calculation map is created, and each time each detection target pulse signal is detected, the time T from the detection of each detection target pulse signal to the detection of the reference position θb1 and the time T It is desirable to detect the rotation speed N and obtain the generation position of each detection target pulse signal using the detected time T, the rotation speed N, and the map.

In the bench test performed when creating this map, first, the position at which the signal generator 4 generates the pulse signal to be detected is set to a known initial position θo (see FIG. 3C). The initial position θo may be set to any position, but in the example shown in the figure, the initial position θo is a position delayed by γ degrees (γ = 9 in the example shown) from the top dead center TDC. In this way, with the position of the base plate 14 adjusted so that the detection target pulse signal Vs1 is generated at a predetermined initial position, the engine is operated at a constant rotation speed N [rpm].
], The time T from the time when the detection target pulse signal Vs1 is generated to the time when the reference position θb1 is detected.
1 (time required to rotate β1 angle shown in FIG. 3) is measured.

Next, the base plate 14 is rotated by an arbitrary angle Δβ, and as shown in FIG.
Make the pulse signal to be detected generated at position 1.
In this state, the time T2 from the time when the detection target pulse signal Vs1 is generated to the time when the reference position θb1 is detected is measured, and when the detection target pulse signal is generated at the time T2 measured this time and the initial position θo. Based on the difference ΔT = T2-T1 from the measured time T1 and the rotation speed N at that time, the angle Δβ between the generation position θ1 of the current detection target pulse signal and the initial position θo is Δβ = (N / 60) × ( ΔT × 360) is calculated. This makes it possible to know how many times the current generation position θ1 of the detection target pulse signal is with respect to the initial position θo. Here, assuming that the top dead center TDC of the engine is the origin, and the absolute position θx of the generation position of each detection target pulse signal is obtained with the angle measured from the origin to the advance side as a positive angle, the detection target pulse signal The absolute position θx of the generation position is a position advanced by (Δβ−γ) degrees from the origin position.

Similarly, the generation positions of the detection target pulse signals are changed to θ2, θ3, ... And the times T3 and T4 from the generation time of each detection target pulse signal to the time when the reference position is detected. , Is measured, and the relationship between the time Tx, the rotation speed Nx, and the absolute position θx of the generation position of the detection target pulse signal is obtained, and the time Tx, the rotation speed Nx, and the generation position of the detection target pulse signal are calculated. Absolute position θx
Create a pulse signal generation position calculation map that gives the relationship between and. Data that compose this map (time Tx that defines each map point, rotation speed Nx, and generation position θ
x) is stored in the ROM or EEPROM of the microcomputer.

When the engine is actually operated, every time each detection target pulse signal Vs1 is detected, a timer in the microcomputer is used to generate each detection target pulse signal until the detection time of the reference position θb1. Of the pulse signals Vs1 and Vs2 is detected, and the rotational speed N at that time is detected, and the detected time Tx and rotational speed Nx and the above map are used to detect each detection target. Obtain the pulse signal generation position θx.

In the above example, the timer provided in the microcomputer is used to measure the time from the generation time of the detection target pulse signal to the detection time of the reference position θb1 to thereby detect each detection target pulse signal. Although the generation position is detected, as in the example shown in FIG. 2, the position detection pulse generation including the signal generator 4'which generates the position detection pulse Vp each time the internal combustion engine rotates by a minute angle is generated. (Crank angle sensor) is provided, and the position detection pulse V
A method of detecting the rotation angle of the crankshaft by counting p can also be adopted.

In this case, each detection target pulse signal Vs1
Position detection pulse V from when each detection target pulse signal is generated until the reference position θb1 is detected.
p is counted, the angle β between the generation position of each pulse signal to be detected and the reference position is calculated from the count value Q, and the angle β and the reference position θb1 are used to calculate the angle β for the specific rotational angle position of the engine. The generation position of the detection target pulse signal is obtained.

In this case as well, with respect to the count value Q of the position detection pulse Vp counted from the detection of each detection target pulse signal to the detection of the reference position θb1 and the specific rotational angle position of the engine. A pulse signal generation position calculation map that gives a relationship with the generation position of each detection target pulse signal Vs1 is created in advance, and each detection target pulse signal V
Every time s1 is detected, the number of position detection pulses generated between the detection of the detection target pulse signal and the detection of the reference position θb1 is counted, and the count value Q and the pulse signal generation position calculation are calculated. It is preferable to determine the generation position of each pulse signal to be detected using the map.

The bench test performed when creating this map is performed as follows, for example. First, the position where the signal generator 4 generates the detection target pulse signal is set to, for example, a known initial position θo (see FIG. 3C) delayed by γ degrees from the top dead center. In this state, the engine is operated at a constant rotation speed N [rpm]
Position detection pulse Vp (of the positive and negative pulse signals generated by the signal generator 4 ′) generated between the position where the detection target pulse signal Vs1 is detected and the position where the reference position θb1 is detected. Positive pulse signals) are counted to obtain the count value Q1.

Next, the base plate 14 is rotated by an arbitrary angle Δβ, and as shown in FIG.
Make the pulse signal to be detected generated at position 1.
In this state, the position detection pulses Vp generated while the engine rotates from the position where the detection target pulse signal Vs1 is generated to the position where the reference position θb1 is detected are counted to obtain the count value Q2, which is measured this time. Count value Q2 and initial position θo
The difference .DELTA.Q = Q2-Q1 from the count value Q1 measured in 1. is obtained. Here, ΔQ and the number of teeth K of the ring gear 16 (the positive polarity pulse Vp generated by the signal generator 4'per one revolution of the engine)
Of the current detection target pulse signal, the angle Δβ between the current generation position θ1 of the detection target pulse signal and the initial position is calculated as follows: Δβ = ΔQ ×
It is calculated by the formula (360 / K). When the absolute position θx of the pulse signal generation position is determined with the top dead center TDC as the origin position, the absolute position is obtained by θx = Δβ−γ.

Similarly, the generation positions of the pulse signals to be detected are changed to θ2, θ3, ..., Corresponding to the absolute positions of the generation positions θ1, θ2, θ3, ... Of the pulse signals to be detected, respectively. The count values Q1, Q2, Q3, ... Of the position detection pulse signal are obtained, and the position detection pulse Vp
A pulse signal generation position calculation map that gives a relationship between the count value Qx of the pulse signal and the absolute position θx of the generation position of the pulse signal to be detected is created.

As described above, in the method of the present invention, the zero point of the output voltage of the magnet generator is used as the reference position. Therefore, as the zero point used as the reference position, a zero point in which the position variation due to the armature reaction is minimized is selected. Is preferred.

As shown in FIG. 1, the zero point of the output voltage of the exciter coil 2 that charges the capacitor C1 of the ignition circuit 1 slightly fluctuates due to the armature reaction. It is confirmed that there is no problem in practical use, which is sufficiently smaller than the tooth gap (= 3.2 degrees) of a typical ring gear 16 used as a rotor of a sensor that detects a rotation angle.

As shown in FIG. 1, the exciter coil 2
When the capacitor C1 is charged in the positive half cycle of the output of, the output voltage of the exciter coil is smaller than the fluctuation of the position of the zero point which occurs when the output voltage shifts from the positive half cycle to the negative half cycle. Since the fluctuation of the position of the zero point that occurs when shifting from the negative half cycle to the positive half cycle is smaller, as shown in the illustrated example, the exciter coil 2
Of the zero point when the output voltage of the output voltage shifts from the negative half cycle to the positive half cycle, and the zero point position detected first after the detection target pulse signal Vs1 is detected is the reference position θ.
It is preferably b1.

As described above, when the method for detecting the rotation angle of the engine by generating the position detection pulse Vp and counting the position detection pulses, each detection is performed without detecting the rotation speed. Since the generation position of the target pulse signal can be obtained, it is possible to accurately detect the generation position of the detection target pulse signal even in a low speed region of the engine where it is difficult to accurately measure the rotational speed of the engine.

When the generation position of each pulse signal to be detected is detected as described above, the signal generating electron 4 for generating the pulse signal is rotatably operated at any time.
Even when it is attached to 4, it is possible to detect the absolute position of the generation position of the detection target pulse signal (for example, the position with respect to the top dead center TDC), and thus measure various control amounts from the detected generation position. The start position can be calculated, and the ignition position and the like can be controlled using the microcomputer 3.

When controlling the ignition position of the internal combustion engine,
For example, the rotation angle position θam corresponding to the maximum advance position of the engine
Is set as the measurement start position of the ignition position, and the ignition position at each engine speed is calculated in the form of the time required for the engine to rotate from the measurement start position θam to the ignition position. Generation position θ of the pulse signal Vs1 to be detected detected by the method of the present invention
The maximum advance position θam is calculated from x, and the maximum advance position θam is measured from the generation position of the detection target pulse signal Vs1.
Measurement of the ignition position calculated when the maximum advance position θam is measured is started, and when the ignition position is measured, an ignition signal is given to the ignition circuit 1 to perform an ignition operation.

As described above, when the signal-generating electrons are attached to the base plate which is rotated at any time, the position at which the signal-generating electrons generate a pulse signal corresponds to the rotation angle of the base plate. It includes information on control conditions included in the rotation angle. Therefore, according to the method of the present invention, it is possible to obtain information on the control condition included in the rotational angle position of the base plate from the detected pulse signal generation position, and this information can be used for various controls.

For example, as shown in the above example, when the base plate is designed to rotate in conjunction with the throttle valve, the position where the pulse signal obtained from the signal generator is generated is the opening of the throttle valve. Therefore, information on the opening of the throttle valve can be obtained by detecting the generation position of the detection target pulse signal Vs1 by the method of the present invention, and this valve opening information can be used as the ignition position and the fuel injection amount. Can be used to control

When the generation position of each detection target pulse signal is detected as described above, the position where the measurement of the ignition position of each cylinder of the engine is started can be calculated from the position of the detection target pulse signal. The ignition position of an internal combustion engine with a plurality of cylinders can be controlled even by mounting one signal emitting electron on the base plate.

The method of the present invention is not limited to the case where only one signal emitting electron is mounted on the base plate, and can be applied to the case where the signal emitting electrons for a plurality of cylinders are mounted on the base plate. Of course.

In the above example, the position detecting pulse generator is composed of the ring gear 16 and the signal generating electron 4 '. However, this position detecting pulse generator detects the position every minute rotation of the engine. Any pulse can be used as long as it can generate a working pulse, and is not necessarily limited to the one shown in the above example. Various types of rotary encoders that generate a pulse signal for each minute rotation angle can also be used as the position detecting pulse generator.

In the above example, the magnet generator is configured with 12 poles. However, the magnet generator used in carrying out the method of the present invention has an angle (see FIG. 3) corresponding to one cycle of its output voltage. It is sufficient that the condition that the angle α) is larger than the rotation range of the base plate is satisfied, and
Not limited to pole magnet generators.

In the above example, the arc angle (polar arc angle) of the reluctor provided on the rotor 13 of the signal generator is 180 degrees, but the arc angle of the reductor is arbitrary. Further, in the above example, the reluctor is provided on the boss portion of the flywheel, but the reluctor is provided on the outer periphery of the peripheral wall portion of the flywheel so that the signal generator 4 is provided so as to face the outer peripheral surface of the flywheel. May be.

In the above example, the zero point generated when the output of the exciter coil 2 shifts from the negative half cycle to the positive half cycle is used as the reference position, but the zero point of the output voltage of another generator coil is used as the reference position. It may be used as a position.

[0078]

As described above, according to the present invention, when the signal generator for generating the pulse signal is attached to the base plate which is rotated at any time, the base plate can be rotated at any position. Since the absolute position of the generation position of the pulse signal can be detected, a specific rotation angle position of the engine from the detected generation position of the pulse signal or a position having a fixed relationship with the specific rotation angle position. Can be obtained by calculation, and the position can be used as the measurement start position for various control variables. Therefore, according to the method of the present invention, various controls can be performed using the microcomputer even when the signal generator is attached to the base plate which is rotated at any time.

Further, according to the present invention, by detecting the generation position of the pulse signal, information on the control condition included in the rotation angle of the base plate which is rotated at any time can be obtained without using a special sensor. Therefore, the information included in the rotation angle of the base plate can be easily incorporated into the control. For example, when the base plate is rotated in conjunction with the throttle valve, it is possible to obtain throttle valve opening information from the position where the pulse signal is generated. Therefore, a sensor that detects the throttle valve opening is used. It is possible to detect the opening of the throttle valve and provide various controls for the opening of the valve without providing the above.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a circuit configuration of an apparatus used for carrying out the method of the present invention.

FIG. 2 is a configuration diagram showing a configuration example of a magnet generator and a signal generator used when carrying out the method of the present invention.

FIG. 3 is a waveform diagram showing waveforms of voltages at respective parts in FIG.

[Explanation of symbols]

 1 Ignition circuit 2 Exciter coil 3 Microcomputer 4, 4'Signal generator 5 Waveform shaping circuit 6 Waveform shaping circuit 10 Flywheel 11 Magnet rotor 13 Rotor 16 Ring gear

Claims (4)

[Claims] 1. A rotor provided so as to rotate synchronously with a crankshaft of an internal combustion engine, and a base plate which is provided so as to be rotatable around the rotor by a predetermined angle and is rotatably operated at any time. The position of the pulse signal obtained from the pulse signal generator for controlling the internal combustion engine, which is provided with a signal generator that detects a change in magnetic flux generated by the rotor and generates positive and negative pulse signals once per revolution. A signal generation position detecting method for detecting, wherein a magnet generator that generates an alternating voltage in synchronization with rotation of the internal combustion engine is attached to the internal combustion engine, and the output of the magnet generator is from a negative half cycle to a positive value. The zero point generated when shifting to the half cycle or the specific zero point among the zero points generated when the output of the generator shifts from the positive half cycle to the negative half cycle is set to a known reference position θ. Being able to detect as b1, the positive pulse signal generated by the signal electron and the negative pulse signal of any one of the negative polarity pulse signal as the detection target pulse signal, each detection target pulse signal Each time it is generated, the time T from the generation of each detection target pulse signal to the detection of the reference position θb1 is detected, and the time T and the rotation speed N at that time are detected.
From this, the angle β = (N / 60) × (T × 360) between the generation position of each pulse signal to be detected and the reference position is calculated, and from the angle β and the reference position θb1, the engine A signal generation position detection method for a pulse signal generation device for controlling an internal combustion engine, characterized in that a generation position of each detection target pulse signal with respect to a specific rotation angle position is obtained. 2. A rotor provided so as to rotate synchronously with a crankshaft of an internal combustion engine, and a base plate which is provided so as to be rotatable around the rotor by a predetermined angle and is rotatably operated at any time. The position of the pulse signal obtained from the pulse signal generator for controlling the internal combustion engine, which is provided with a signal generator that detects a change in magnetic flux generated by the rotor and generates positive and negative pulse signals once per revolution. A signal generation position detecting method for detecting, wherein a magnet generator that generates an alternating voltage in synchronization with rotation of the internal combustion engine is attached to the internal combustion engine, and the output of the magnet generator is from a negative half cycle to a positive value. The zero point generated when shifting to the half cycle or the specific zero point among the zero points generated when the output of the generator shifts from the positive half cycle to the negative half cycle is set to a known reference position θ. Being able to detect as b1, the positive pulse signal generated by the signal electron and the negative pulse signal of any one of the negative polarity pulse signal as the detection target pulse signal, each detection target pulse signal The reference position θb1
A pulse signal generation position calculation map that gives a relationship between the time T until the detection of T, the rotation speed N at that time, and the generation position of the detection target pulse signal with respect to a specific rotation angle position of the engine, Each time each detection target pulse signal is detected, the time T from the detection of each detection target pulse signal to the detection of the reference position and the rotation speed N at that time are detected, and the detected time T A signal generation position detecting method for a pulse signal generator for controlling an internal combustion engine, characterized in that a generation position of each detection target pulse signal is obtained using the rotation speed N and the map. 3. A rotor provided so as to rotate in synchronization with a crankshaft of an internal combustion engine, and a base plate which is provided so as to be able to rotate around the rotor by a predetermined angle and is rotationally operated at any time. The position of the pulse signal obtained from the pulse signal generator for controlling the internal combustion engine, which is provided with a signal generator that detects a change in magnetic flux generated by the rotor and generates positive and negative pulse signals once per revolution. A signal generation position detecting method for detecting, wherein a magnet generator that generates an alternating voltage in synchronization with rotation of the internal combustion engine is attached to the internal combustion engine, and the output of the magnet generator is from a negative half cycle to a positive value. A known reference is made to the zero point that occurs when shifting to a half cycle or the zero point that occurs when the output of the magneto-generator shifts from a positive half cycle to a negative half cycle. Position .theta.b1 and a position detecting pulse generator that generates a position detecting pulse each time the internal combustion engine rotates by a minute angle, and the crankshaft by counting the position detecting pulses. In order to be able to detect the rotation angle of, the pulse signal of any one of the positive pulse signal and the negative pulse signal generated by the signal emitting electron as the detection target pulse signal, each detection target pulse Each time a signal is generated, the position detecting pulses are counted from the time each detection target pulse signal is generated until the reference position θb1 is detected, and the count value Q is counted.
Calculate the angle β between the generation position of each detection target pulse signal and the reference position, from the angle β and the reference position θb1 the generation position of each detection target pulse signal for a specific rotation angle position of the engine A method for detecting a signal generating position of a pulse signal generator for controlling an internal combustion engine, which is characterized by: 4. A rotor provided so as to rotate synchronously with a crankshaft of an internal combustion engine, and a base plate which is provided so as to be able to rotate around the rotor by a predetermined angle and is rotationally operated at any time. The position of the pulse signal obtained from the pulse signal generator for controlling the internal combustion engine, which is provided with a signal generator that detects a change in magnetic flux generated by the rotor and generates positive and negative pulse signals once per revolution. A signal generation position detecting method for detecting, wherein a magnet generator that generates an alternating voltage in synchronization with rotation of the internal combustion engine is attached to the internal combustion engine, and the output of the magnet generator is from a negative half cycle to a positive value. A known reference is made to the zero point that occurs when shifting to a half cycle or the zero point that occurs when the output of the magneto-generator shifts from a positive half cycle to a negative half cycle. Position .theta.b1 and a position detecting pulse generator that generates a position detecting pulse each time the internal combustion engine rotates by a minute angle, and the crankshaft by counting the position detecting pulses. In order to be able to detect the rotation angle of, the pulse signal of any one of the positive pulse signal and the negative pulse signal generated by the signal emitting electron as the detection target pulse signal, each detection target pulse After the signal is generated, the reference position θb1
For calculating a pulse signal generation position, which gives a relationship between the count value Q of the position detection pulse counted until the detection of the pulse and the generation position of each detection target pulse signal with respect to a specific rotation angle position of the engine. A map is created, and each time each detection target pulse signal is detected, the position detection pulses that are generated from the detection of the detection target pulse signal to the detection of the reference position are counted. Then, the generation position of each detection target pulse signal is obtained using the count value Q and the pulse signal generation position calculation map, and a signal generation position detection method for a pulse signal generation device for controlling an internal combustion engine.