JP3118995B2 - Ignition device for internal combustion engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition device for an internal combustion engine that controls an ignition position by using a computer.

[0002]

2. Description of the Related Art Generally, in an ignition device for controlling the ignition position of an internal combustion engine using a computer, information on the rotation angle and the number of rotations of the engine are obtained from a reference signal generated at a predetermined rotation angle position in synchronization with the rotation of the internal combustion engine. Information is obtained, an ignition position is calculated based on the information, and an ignition signal is supplied to an ignition circuit at the calculated ignition position to perform an ignition operation.

[0003] Therefore, this type of ignition device includes a reference signal generation device that generates a reference signal having a fixed relationship with the rotation angle (crank angle) of the internal combustion engine, and a rotation speed of the internal combustion engine [ rpm], reference position detection means for detecting a constant rotation angle position of the internal combustion engine from the reference signal as a reference position, and an angle from the reference position to the ignition position at each rotation speed. Ignition position measurement time calculation means for calculating time as an ignition position measurement time, and ignition signal generation for generating an ignition signal when a time equal to the ignition position measurement time is measured by starting time measurement when a reference position is detected. Means, an ignition circuit for generating a high voltage for ignition when an ignition signal is generated, and an ignition power supply for supplying ignition energy to the ignition circuit.

In this type of conventional ignition device, a signal generator mounted on an internal combustion engine is used as a reference signal generator together with a magnet type AC generator constituting an ignition power supply. The signal generator includes a rotor having a reluctor having a predetermined polar arc angle, and a signal generator for generating a reference signal at each of a front edge and a rear edge in the rotation direction of the reluctor.

[0005] The reference position detecting means detects a position where a specific reference signal output from the signal generator is generated as a reference position. The ignition position measurement time calculation means calculates the ignition position at each rotation speed of the internal combustion engine by a method such as a map calculation, and calculates a time corresponding to the angle from the reference position to the ignition position (when the internal combustion engine rotates from the reference position to the ignition position). ) Is stored in the RAM as the ignition position measurement time.

The ignition signal generating means reads out the ignition position measurement time from the RAM every time the reference signal is generated, sets it in a timer, and generates an ignition signal when the timer finishes measuring the ignition position measurement time. The ignition circuit is a magnet-type AC power generator driven by an internal combustion engine, such as a capacitor discharge type.
The ignition circuit generates a high voltage for ignition on the secondary side of an ignition coil when an ignition signal is given, and generates a spark on a spark plug attached to a cylinder of the engine. .

[0007]

As described above, in a conventional ignition device for an internal combustion engine in which ignition timing is controlled by a computer, a reference signal is generated in addition to a generator as an ignition power supply for supplying ignition energy. The problem is that the cost is inevitably high because of the need for a signal generator, and the space for the signal generator to be placed around the output shaft of the engine requires a large engine. was there.

It is an object of the present invention to provide an ignition device for an internal combustion engine which can obtain a reference signal required for control by a computer without using a signal generator.

[0009]

According to the present invention, there is provided a reference signal generator for generating a reference signal having a fixed relation with the rotation angle of an internal combustion engine, and a reference rotation position of the internal combustion engine based on the reference signal. Reference position detection means for detecting as
An ignition position measurement time calculating means for calculating a time corresponding to an angle from the reference position to the ignition position at each rotation speed as an ignition position measurement time; and starting time measurement when the reference position is detected, and setting the ignition position measurement time to An ignition device for an internal combustion engine including an ignition signal generating means for generating an ignition signal when an equal time is measured, and an ignition circuit for generating a high voltage for ignition when the ignition signal is generated. A reference signal required for control by a computer can be obtained without using it.

Therefore, in the ignition device of the present invention, the reference signal generating device is configured such that magnetic poles of different polarities are alternately arranged in the circumferential direction, and is driven by an internal combustion engine. An armature core having a magnetic pole portion facing the magnetic pole of the armature, and a stator having a power generating coil wound around the armature core, and an AC for supplying to an electrical component load including an ignition circuit. It comprises a magnet type alternator that outputs a voltage, and a reference signal generating circuit that detects a zero point or a peak point of an output voltage of a generating coil provided in the magnet type alternator and generates a reference signal.

Generally, a computer recognizes a change in a signal from a low level to a high level or a change from a high level to a low level as a signal. Therefore, the reference signal generation circuit can be constituted by a waveform conversion circuit that converts the output voltage of the power generation coil into a rectangular wave signal whose rising or falling coincides with the zero point or the peak point of the output voltage.
In this case, the rise or fall of the rectangular wave signal obtained from the waveform conversion circuit is used as a reference signal.

According to the present invention, there is provided a magnet type alternator.
The number of poles of the magnet rotor is changed during one revolution of the internal combustion engine.
Voltage for driving electrical component loads from the AC generator
To the normal number of poles (even number) necessary to obtain
Select. In addition, of the AC voltage of multiple cycles,
Both positive and negative half cycle waves of AC voltage in one cycle
In order to make the shape asymmetrical, at least the magnet rotor
Some pole spacings are different from other pole spacings, or
The polar arc angle of at least one magnetic pole of the magnet rotor is changed to another magnetic pole.
Different from the polar arc angle of the pole.

[0013]

There is no slip between the output shaft of the internal combustion engine and the rotating shaft of the magnet type alternator driven by the internal combustion engine (generally, there is no slip because the generator is directly connected to the output shaft of the internal combustion engine). ), The zero point and the peak point of the output voltage of the generator respectively correspond to a specific rotational angle position of the engine.

Therefore, as described above, if the reference signal is obtained by detecting the zero point or the peak point of the output voltage of the generating coil provided in the magnet type alternator attached to the internal combustion engine, It is possible to obtain a reference signal that gives rotation angle information and rotation speed information to the computer without using it. Therefore, since the signal generator can be omitted, the configuration of the ignition device can be simplified, and the size and cost of the engine can be reduced.

As described above, the internal combustion engine makes one revolution.
At least a part of the magnetic poles of the magnet rotor so that the waveform of the positive and negative half cycles of the AC voltage of at least one cycle of the plurality of cycles of the AC voltage generated by the magnetic AC generator is asymmetric. If the interval is different from the other magnetic pole interval, or if the polar arc angle of at least one magnetic pole of the rotor is different from the polar arc angle of the other magnetic pole, it is obtained from the reference signal generation circuit during one revolution of the engine. Since the generated intervals between the series of reference signals are non-uniform, the non-uniformity can be used to identify a specific reference signal, and the reference position can be easily determined based on the specific reference signal. Can be identified.

In this case, since the number of poles of the magnet rotor selected so as to generate a plurality of cycles of AC voltage for driving the load per rotation is not changed at all, a part of the magnetic poles of the magnet rotor is partially replaced by the load. It is possible to prevent the generator output from lowering due to the occurrence of a state that is not used for inducing a driving AC voltage. That is, according to the present invention, the magnet
The reference signal used for the ignition device for the internal combustion engine can be obtained without sacrificing the output used for the intended use of the AC generator .

Incidentally, the zero point and the peak point of the output voltage of the generator driven by the internal combustion engine fluctuate due to the armature reaction of the generator. When obtaining the engine speed information, since the generation interval of the reference signal is used as calculation data, there is no effect even if the generation position of each reference signal fluctuates. However, since the absolute position must correspond to a specific rotation angle position of the engine, if the reference signal generation position fluctuates due to armature reaction, if the specific reference signal generation position is used as the reference position, The ignition position will deviate from the calculated ignition position.

However, when the ignition position is controlled by the computer, even if there is an effect of the armature reaction, if the relationship between the rotation speed of the engine and the load current of the generating coil is known, a specific reference signal is used. Since the correct reference position can be obtained by correcting the detected reference position by calculation, no problem occurs. In order to obtain the correct reference position without the influence of the armature reaction, for example, a variation amount of the reference signal generation position is obtained in advance with respect to the rotation speed, and the reference position obtained from the reference signal generation position is obtained as follows: The actual reference position may be detected by correcting by the amount of change in the reference signal generation position at each rotation speed.

The power generating coil used in this case is preferably a power generating coil in which the characteristic of the load current with respect to the engine speed is substantially constant (a power generating coil that drives a load that operates constantly during operation of the internal combustion engine). However, such a power generating coil includes, for example, a power generating coil used for supplying ignition energy to an ignition device for an internal combustion engine. In the case of a generating coil for driving a lighting load or the like, the armature reaction does not occur when the load is disconnected, and the armature reaction occurs only when the load is applied, and the reference signal generation position fluctuates. Will be. Therefore, in this case, if a means for detecting the load application is provided so that the calculation for correcting the detected reference position is performed only when the load application is detected, the detection of the reference position is always performed. Can be performed accurately.

[0020]

FIG. 1 shows the configuration of an embodiment of the present invention. In FIG. 1, reference numeral 1 denotes an ignition coil, 2 denotes an ignition energy storage capacitor provided on the primary side of the ignition coil,
Reference numeral 3 denotes a thyristor as a discharge control switch provided for discharging the electric charge of the capacitor 2 to the primary coil of the ignition coil. In the illustrated example, one end of a primary coil of the ignition coil is grounded, one end of a capacitor 2 is connected to a non-ground side terminal of the primary coil, and a thyristor 3 is connected between the other end of the capacitor 2 and ground. Have been. Reference numeral 4 denotes an ignition power generating coil provided in a magnet type alternator (hereinafter, referred to as a magnet generator) attached to the internal combustion engine. The output of this generating coil passes through a diode 5 to the capacitor 2 and the primary of the ignition coil. It is applied to both ends of the series circuit with the coil. An ignition plug 6 attached to a cylinder of an engine (not shown) is connected to a secondary coil of the ignition coil.

The ignition coil 1, the capacitor 2, the thyristor 3, the power generation coil 4, the diode 5, and the ignition plug 6 constitute a capacitor discharge type ignition circuit 7. In this ignition circuit, the power generation coil 4
Generates a positive half cycle output voltage in the direction of the arrow shown, the capacitor 2 is charged to the polarity shown through the diode 5 and the primary coil of the ignition coil. When an ignition signal is given to the gate of the thyristor 3, the thyristor 3 conducts, so that the electric charge of the capacitor 2 is discharged through the thyristor 3 and the primary coil of the ignition coil. As a result, a large change in magnetic flux occurs in the core of the ignition coil, and a high voltage for ignition is induced in the secondary coil of the ignition coil.
Since this high voltage is applied to the spark plug 6, a spark is generated in the spark plug, and the engine is ignited.

An ignition position control device 8 is provided to control the position at which an ignition signal is applied to the gate of the thyristor 3 of the ignition circuit to control the ignition position of the engine. The control device includes a computer having a CPU 9, a ROM 10, a RAM 11, and a timer 12, a reference signal generating circuit 13 for detecting a zero point or a peak point of an output voltage of the power generation coil 4 and generating a reference signal, and a power supply for the power generation coil 4. Power supply circuit 1 that supplies a constant DC voltage to the power supply terminal of the computer
4 and the ignition signal output from the CPU 9
And an ignition signal output circuit 15 which is provided to the gate of the thyristor 3 in a form suitable for triggering the thyristor 3.

The reference signal generating circuit 13 converts the output voltage of the power generation coil 4 into a rectangular wave signal Vq whose rising and falling positions substantially coincide with the zero point or peak point of the output voltage, Vq is given to the CPU 9. CPU
Recognizes the rise or fall of the rectangular wave signal Vq as a reference signal and obtains information on the rotation angle of the internal combustion engine. In this example, the power generation coil 4 and the reference signal generation circuit 13
Thus, a reference signal generator is configured.

FIG . 6 shows a magnet generator mounted on an internal combustion engine.
1 shows a general configuration of an electric machine. In FIG. 6, reference numeral 20 denotes a flywheel magnet rotor. This rotor has a flywheel 21 formed in a cup shape and a polar arc angle attached to the inner periphery of a peripheral wall portion of the flywheel 21 at equal angular intervals. It consists of four permanent magnets 22a to 22d. Reference numerals 23 and 23 'denote stators. These stators each have an armature core 24 having magnetic pole portions at both ends.
And 24 ', and the generating coils 4 and 4' wound around the armature cores 24 and 24 '.

The magnets 22a to 22d of the magnet rotor are magnetized in the radial direction with alternately different polarities so that different magnetic poles are alternately arranged in the circumferential direction, and these magnets form four rotor magnetic poles. It is configured. The magnet rotor 20 is attached to the engine by fitting a boss (not shown) provided on the bottom wall of the flywheel 21 to a rotating shaft (usually a crankshaft) of the engine. The stators 23 and 23 'are attached to a stator base plate fixed to an engine case or the like,
The magnetic pole portions at both ends of each iron core are opposed to the rotor magnetic pole via a predetermined gap.

Here, a magnet having the above-mentioned general configuration
The generator coil 4 of the generator is used to supply ignition energy to an ignition device for an internal combustion engine as shown in FIG.
The generating coil 4 ', shall be used for charging of the drive and the battery of the lighting loads, such as headlights. When the engine rotates, an AC voltage Ve as shown in FIG. 8A is induced in the power generation coil 4, and a voltage Ve 'as shown in FIG. 8B is induced in the power generation coil 4'. 8 (A) and 8 (B) show the induced voltage waveforms when the generator coils 4 and 4 'are not loaded with the rotation angle θ of the engine taken on the horizontal axis. As shown in FIG. If a magnet rotor is used, one of the engines
Two cycles of AC voltages Ve and Ve 'are generated per rotation.

The magnet rotor 20 is directly connected to the engine, and there is no slip between the rotor and the rotating shaft of the engine.
AC voltages Ve and Ve induced in the generating coils 4 and 4 '
The zero and peak points of ´ are the specific rotational angular position θ1 of the engine.
~ Θ8.

Therefore, the zero point and / or peak point of the waveform of the AC voltage Ve induced by the power generation coil 4 is detected .
By doing so, a reference signal can be obtained. Since the signal recognized by the computer is a voltage change from a low level to a high level or a voltage change from a high level to a low level, a rising or falling edge is detected to detect a zero point or a peak point of the waveform of the AC voltage Ve. A rectangular wave signal whose falling coincides with the zero point or peak point of the AC voltage waveform may be obtained, and the computer may recognize the rise or fall of the rectangular wave signal as a reference signal.

For example, the AC voltage Ve shown in FIG.
(In this example, the voltage induced by the power generation coil 4) is changed to a rectangular wave signal Vq having a signal width that matches during the positive half cycle.
When converted to [see FIG. 9B], this rectangular wave signal Vq
The computer recognizes the rise of
Reference signals can be obtained at the positions of 1 and θ5, respectively. Further, by letting the computer recognize the falling of the rectangular wave signal Vq, it is possible to obtain the reference signal at the positions of the angles θ3 and θ7. Whether to recognize the rising edge of the rectangular wave signal as the reference signal or to recognize the falling edge as the reference signal can be freely selected on software.

A rectangular wave signal as shown in FIG. 9B is applied, for example, to the control terminal of a switch circuit capable of on / off control by applying an AC voltage Ve to the switch for a positive half cycle of the AC voltage Ve. It can be obtained by turning off the circuit and turning on the switch circuit during the negative half cycle of the AC voltage.

Assuming that each rising edge of the rectangular wave signal Vq is used as a reference signal, the reference signal can be obtained at the positions of the angles θ1 and θ5. In the present example, the four magnetic poles of the rotor of the magnet type alternator are arranged at equal angular intervals, and the polar arc angles of the rotor magnetic poles are all set to be equal. Is 180 degrees. The time between the generation of the reference signal at the angle θ1 and the generation of the reference signal at the angle θ5 is t, and the engine speed is N.
When [rpm] is set, there is the following relationship between N and t.

N = 30 / t [rpm] (1) Accordingly, by measuring the generation interval t of the reference signal, the engine speed information can be obtained, and the ignition from the reference position is performed based on the engine speed information. The ignition position can be determined by calculating the time corresponding to the angle α to the position as the ignition position measurement time Ta and measuring the measurement time Ta from the reference position.

When the CPU is used , means for recognizing a reference signal and detecting a reference position by predetermined software stored in a ROM, and rotational speed information for obtaining rotational speed information of the engine from an interval of generation of the reference signal. Calculation means; ignition position measurement time calculation means for calculating the time corresponding to the angle from the reference position to the ignition position at each rotational speed as the ignition position measurement time Ta; and starting the timing when the reference position is detected. And an ignition signal generating means for generating an ignition signal when a time equal to the ignition position measurement time is measured . FIG.
In the embodiment shown in FIG. 7, when the positions of the angles .theta.1 and .theta.5 are set as the reference positions, when a reference signal is generated at each reference position (when the rising edge of the rectangular wave signal Vq is detected), the timer 12
Is set to the ignition position measurement time Ta to start the timekeeping operation. When the timer 12 completes the measurement of the ignition position measurement time Ta, the ignition signal Vi is supplied to the thyristor 3 through the ignition signal output circuit 15. In this manner, ignition positions can be performed at these ignition positions, with the positions separated from the reference positions θ1 and θ5 by a predetermined angle α as the ignition positions θi and θi ′. In the calculation of the ignition position measurement time Ta, a map giving the relationship between the rotation speed N and the ignition position measurement time Ta is stored in the ROM, and based on the data read from the map, an interpolation method is used for each rotation speed N. It can be performed by a known method (map calculation) of calculating the ignition position measurement time. Arbitrary ignition characteristics can be obtained by appropriately setting the data (the relationship between the rotational speed N and the ignition position measurement time) constituting the map, and the ignition position is advanced as the rotational speed increases. In addition, various controls for retarding the ignition position in a high-speed region can be performed. In addition to controlling the ignition position with respect to the rotational speed, the ignition position can be controlled according to the temperature of the engine so as to prevent overheating of the engine.

As described above, the magnet generator shown in FIG.
When used, the positions of angles θ1 and θ5 180 degrees apart
Since the measurement of the ignition position measurement time is started at each of the reference positions, the ignition operation is performed twice at 180-degree intervals during one rotation of the engine. Internal combustion engine 2
In the case of a cycle engine, if one of the ignition operations performed twice per revolution is performed at a regular ignition position before the top dead center of the engine, the other ignition operation is performed by exhaust gas. Since it is performed in the process, there is no hindrance to the operation of the engine.

However, the two ignition positions θi and θ
In the case where different cylinders are ignited at i ′, FIG.
It is not appropriate to use the indicated magnet generator. That is, on
As described above, if the reference signal generation intervals are equal, the two
Since it is difficult to distinguish between the quasi-positions θ1 and θ5,
The cylinder to be ignited cannot be determined. So the book
In the invention, the magnet generator is activated during one revolution of the engine.
At least one of multiple cycles of AC voltage generated
The positive and negative half-cycle waveforms of the AC voltage
The magnet generator is configured as
Series of reference signal phases obtained from the reference signal generation circuit during
Make the distance between them uneven, and use this unevenness to specify
Of the reference signal can be identified. Magnet used in the present invention
A specific configuration example of the stone generator will be described later. In the above example , in the region where the engine speed is low, the rotation of the engine is unstable.
And θ2 may fluctuate, and it may not be possible to accurately obtain information on the number of revolutions. To avoid such inconveniences, when the engine is running at a low speed, an ignition signal is supplied to the ignition circuit from a signal supply circuit consisting of a hardware circuit that does not fluctuate in the ignition position. After that, an ignition signal obtained by operating a computer by predetermined software may be given to the ignition circuit.

FIG. 2 shows an embodiment in which an ignition signal is supplied from a hardware circuit at a low speed, and an ignition signal obtained by software is supplied in a region equal to or higher than the set number of revolutions. A signal supply circuit 30 for providing an ignition signal to the thyristor 3 by the output voltage of the negative half cycle of 4 is provided. The signal supply circuit 30 includes a capacitor C1, resistors R1 to R3, a thyristor Th1, a zener diode ZD1, and a diode D1, and an ignition signal obtained from the signal supply circuit is supplied to the gate of the thyristor 3 through a diode D2. . The output terminal 15a of the ignition signal output circuit 15 of the ignition position control circuit is connected to the gate of the thyristor 3 through a diode D3.

The ignition position control circuit 8 is provided with a hardware / software switching circuit 16. The hard / soft switching circuit is, for example, a switching circuit which is turned on / off by a control signal given from a CPU. One end of the switching circuit constituting the hard / soft switching circuit is connected to the anode of a diode D2 through a wiring 16a.
The other end is grounded. The switch circuit constituting the hard / soft switching circuit is controlled to maintain the off state when the rotational speed of the internal combustion engine is less than the set value, and to maintain the on state when the rotational speed is at or above the set value. You.

The control of the hardware / soft switching circuit 16 does not necessarily have to be performed by the CPU. When the rotational speed of the engine becomes equal to or higher than the set value, the magnet type alternator generates an output voltage higher than the set value. The hard / soft switching circuit 16 may be controlled in accordance with the output voltage of the generator so that the switch circuit is turned on when this happens. The ignition position control device 8 of the embodiment of FIG. 2 does not generate an ignition signal when the rotation speed of the internal combustion engine is less than a set value, and generates an ignition signal Vi only when the rotation speed becomes equal to or more than the set value. It is configured as follows. When the rotation speed of the engine is lower than the set value, the switch circuit constituting the hard / soft switching circuit 16 is in the cut-off state. Therefore, the anode of the diode D2 for giving the ignition signal generated by the signal supply circuit 30 to the thyristor 3 is not grounded. It is in. When the generating coil 4 generates a voltage of a negative half cycle having a polarity opposite to the direction of the arrow shown, a current flows through the resistor R3, the capacitor C1, and the diode D1, and the capacitor C1 is charged to the polarity shown. When the voltage across the capacitor C1 reaches the set value, the Zener diode ZD1 becomes conductive, and the thyristor Th1 becomes conductive. When the thyristor Th1 conducts, the electric charge of the capacitor C1 is discharged between the diode D2 and the gate and cathode of the thyristor 3 and through the thyristor Th1,
Thereby, the ignition signal is given to the thyristor 3. The generation position of the ignition signal given from the signal supply circuit 30 is a position where the output voltage of the negative half cycle of the power generation coil 4 reaches the set value, and at a low speed, the position hardly fluctuates.
This makes it possible to stabilize the ignition position of the engine at low speeds, and to stabilize the rotation of the engine in the low speed range compared to the case where the ignition position at low speeds is determined based on the calculation result of the rotational speed with large errors. Can be

When the number of revolutions of the engine exceeds the set value, the switch circuit constituting the hard / soft switching circuit 16 is kept on and the anode of the diode D2 is grounded. All are bypassed from the ignition circuit through the hard / soft switching circuit 16, and the output of the ignition signal from the signal supply circuit 30 is blocked. Therefore, in this state, the ignition position control circuit 8
The ignition signal is given from the side, and the ignition position of the engine is controlled according to the rotation speed and the like.

FIG. 3 shows another embodiment in which an ignition signal is supplied from a hardware circuit at a low speed, and an ignition signal obtained by software is supplied in a region equal to or higher than a set number of revolutions. , The cathode of the thyristor 3 is connected to a ground circuit through a diode D4, and a hardware signal supply circuit 30 'comprising diodes D5 to D7, resistors R4 and R5, and a Zener diode ZD2.
Is provided. Output terminal 15 of ignition position control circuit 8
a is connected to the gate of the thyristor 3 and constitutes a hard-soft switching circuit (same as that used in the embodiment of FIG. 2) provided in the ignition position control circuit 8; Is connected to the anode of the diode D7.

In the embodiment shown in FIG. 3, when the output voltage of the negative half cycle having the opposite polarity to the arrow shown in the drawing of the generating coil 4 reaches the set value at a low speed of the engine, the generating coil 4 → the Zener diode ZD2 → the diode. D7 → gate / cathode of thyristor 3 → diode D5 → current flows through the path of power generation coil 4, and an ignition signal is given to thyristor 3.

As a result, when the thyristor 3 becomes conductive, the power generation coil 4 → the Zener diode ZD2 → the diode D
6 → Anode and cathode of thyristor 3 → Diode D
5 → Since current flows through the path of the power generation coil 4, the supply of the ignition signal to the thyristor 3 is stopped. Accordingly, the waveform of the ignition signal given to the thyristor 3 can be made into a pulse-like waveform, and the ignition signal is continuously given to the thyristor 3 by the output voltage of the negative half cycle of the power generation coil 4, so that the thyristor 3 Commutation can be prevented from being hindered.

When the number of revolutions of the engine exceeds the set value, the hard / soft switching circuit in the ignition position control circuit 8 sets the diode D
Since the anode 7 is grounded, the supply of the ignition signal from the signal supply circuit 30 'is prevented, and the ignition signal is supplied to the thyristor 3 from the ignition position control circuit 8 side.

In the above-described embodiment, the reference signal is obtained from the output voltage of the power generating coil 4 having the load of the ignition device for the internal combustion engine. However, in the present invention, the electric power is supplied to the electric component load other than the ignition device. The reference signal may be obtained from another power generating coil to be supplied. That is, as shown in FIG. 4, another power generation coil 4 provided in the magnet type alternator.
The reference signal may be obtained by detecting a zero point or a peak point of the output voltage [1] (see FIG. 8B).

In the above embodiment , the rectangular wave signal Vq is generated during the period of the positive half-wave of the AC voltage waveform, and the rising or falling of the rectangular wave signal is used as the reference signal.
Although the reference signal is obtained at the zero point of the AC voltage waveform, the present invention is not limited to the case where the reference signal is obtained at the zero point of the AC voltage waveform, and the reference signal is obtained at the peak point of the AC voltage waveform. May be obtained.

FIG. 5 shows a configuration of a reference signal generating circuit 13 for obtaining a reference signal at a peak point of an AC voltage waveform. This reference signal generating circuit comprises a transistor Tr1, resistors R10 to R13, and a capacitor. C2 and diode D
And 10. In FIG. 5, the collector of the transistor Tr1 is connected to the positive terminal of a DC power supply through a resistor R12.

In the example shown in FIG. 5, when the power generation coil 4 generates a voltage of a positive half cycle in the direction of the arrow shown in FIG. 5, a current flows to the base of the transistor Tr1 through the diode D2, the resistor R10 and the capacitor C2. Becomes conductive. When the induced voltage in the positive half cycle of the generating coil 4 reaches a peak, charging of the capacitor C2 is completed, so that the base current of the transistor Tr1 is cut off, and the transistor Tr1 is turned off. Therefore, as shown in FIG. 10B, the collectors of the transistor Tr1 have the angles .theta.2 and .theta.6 (peak points) as the rising positions and the angles .theta.5 and .theta.
It is possible to obtain a rectangular wave signal Vq having a falling position of θ1 (zero point). In this case, the reference signal can be obtained at the peak position of the AC voltage waveform by recognizing the rising position of the rectangular wave signal Vq.

The zero point and peak point of the output voltage of the generator driven by the internal combustion engine fluctuate due to the armature reaction of the generator. Even if the zero point and peak point of the output voltage of the generator fluctuate due to the armature reaction, the generation interval between the reference signals hardly changes, so that there is almost no error in the rotation speed information obtained from the reference signal, The ignition position of the engine measured based on the reference signal deviates from the calculated position.

Therefore, when there is an effect of the armature reaction, it is necessary to correct the reference position detected by a specific reference signal by calculation to obtain a correct reference position.
In order to obtain the correct reference position without the influence of the armature reaction, for example, a variation amount of the reference signal generation position is obtained in advance with respect to the rotation speed, and the reference position obtained from the reference signal generation position is obtained as follows: The actual reference position may be detected by correcting by the amount of change in the reference signal generation position at each rotation speed.

When the generator coil for obtaining the reference signal is a coil for applying the ignition energy to the ignition device for the internal combustion engine as in the above-described embodiment, the load characteristic thereof is always constant. Is easy to modify.

When the power generating coil for obtaining the reference signal is a power generating coil for driving a lighting load or the like, the armature reaction does not occur when the load is disconnected, but only when the load is applied. As a result, the position where the reference signal is generated fluctuates. Therefore, in this case, if a means for detecting the load application is provided so that the calculation for correcting the detected reference position is performed only when the load application is detected, the detection of the reference position is always performed. Can be performed accurately.

When it is necessary to perform the ignition operation only once per one revolution of the engine, or when it is necessary to determine the cylinder of the engine that performs the ignition operation and generate the ignition spark only in the determined cylinder ( For example, in the case of igniting a four-cylinder internal combustion engine), it is necessary to identify a specific reference signal from the reference signals generated a plurality of times per rotation, and use the position where the identified specific reference signal is generated as the reference position. is there. As shown in Figure 6
As described above, when the magnetic poles of the rotor of the magnet generator are arranged at equal angular intervals and the polar arc angles of the respective rotor magnetic poles are set to be equal, the intervals at which the reference signals are generated are all equal. It is difficult to identify a specific reference signal from a plurality of generated reference signals.

Therefore, in the present invention, in order to facilitate identification of a specific reference signal, the positive and negative AC voltages of at least one cycle of the AC voltage of a plurality of cycles generated during one rotation of the generator are set. The pole spacing of at least a portion of the rotor of the magnet alternator may be different from the other pole spacing or the arc of at least one pole of the rotor so that the half cycle waveform is asymmetric. by varying the angle between the pole arc angle of the other magnetic pole Unisuru. FIG. 7 shows an example of a four-pole magnet generator in which the waveforms of the positive and negative half-cycles of the AC voltage are asymmetrical.
The angle interval between the magnets 22b and 2b is set to 60 degrees, and the angle interval between the magnets 22c and 22d is set to 90 degrees as before.
The polar arc angles of the magnets 22a to 22d are all set equal. The configuration on the stator side is the same as that of the magnet generator shown in FIG.

The waveform of the AC voltage Ve obtained from the generating coil 4 of the magnet generator shown in FIG. 7 is as shown in FIG.
In this case, β1> β2, γ1>
γ2, δ1> δ2, etc., and the AC voltage Ve
When the reference signal is generated at the zero point or peak point of
Since irregularities occur in the intervals between the reference signals, a specific reference signal can be identified by detecting the irregularities, and thereby one reference position can be detected.

For example, by using the reference signal generating circuit 13 of FIG. 5, a rectangular wave signal Vq rising at the peak positions θ2 and θ6 and falling at the zero points θ1 and θ5 is obtained as shown in FIG. Then, the reference signal is obtained by recognizing the falling edge of the rectangular wave signal. In this case, comparing the time Tb1 corresponding to the angle β1 from the angle θ1 to the angle θ5 with the time Tb2 corresponding to the angle β2 from the angle θ5 to the angle θ1, there is a relationship of Tb1> Tb2. Therefore, every time a reference signal is generated, the time interval between the reference signal generated before that is calculated and the time interval calculated this time is compared with the time interval calculated when the previous reference signal is generated. Then, when the relationship of Tb1> Tb2 is detected at the position of the angle θ1, the position of the angle θ1 is set as the reference position, or the position of the angle θ5 at which the next reference signal is generated is set as the reference position. , A specific position can be detected as a reference position. With this configuration, one reference position can be specified per rotation, so that one ignition operation can be performed per rotation. Further, if one reference position can be specified, even in the case of a multi-cylinder internal combustion engine, the ignition positions of a plurality of cylinders of the internal combustion engine can be measured based on the reference position. It is also possible to obtain an ignition device that performs an ignition operation only once per rotation for a cylinder.

FIG. 12 shows that when an eight-pole magnet rotor is used, the interval between two adjacent magnetic poles of the magnet rotor is made smaller than the interval (45 degrees) between the other magnetic poles.
This shows an example in which the AC voltage waveform of one cycle generated in the section from the angles θ1 to θ5 is an asymmetric waveform.
In this case, there is a relation of β1> β2 = β3 = β4, and between times Tb1 to Tb4 corresponding to these angles, Tb1>
Since there is a relationship of Tb2 = Tb3 = Tb4, when Tb2 <Tb1 is detected at the position of the angle θ5, the position of the angle θ5 is set as a reference position, or the reference generated at a position delayed from the position of the angle θ5. Any of the signal generation positions θ9, θ13, and θ1 can be used as the reference position.

In the above example, an asymmetrical AC voltage waveform was obtained by making the magnetic pole intervals of the magnet rotor non-uniform, but the poles of some magnetic poles (for example, two adjacent magnetic poles) of the magnet rotor were obtained. An asymmetrical AC voltage waveform can also be obtained by making the arc angle different from that of the other magnetic poles.

[0058]

As described above, according to the present invention, the reference signal is obtained by detecting the zero point or the peak point of the output voltage of the generating coil provided in the magnet type alternator attached to the internal combustion engine. Thus, a reference signal for providing rotation angle information and rotation speed information to a computer can be obtained without using a signal generator. Therefore, since the signal generator can be omitted, the configuration of the ignition device can be simplified, and there is an advantage that the size of the engine can be reduced and the cost can be reduced.

According to the present invention, the reference signal is obtained by using the power generation coil itself provided in the magnet type AC generator to drive the electric component load, and the reference signal is obtained in the magnet type AC generator. There is no need to provide a dedicated coil. Therefore, there is an advantage that the reference signal can be generated without sacrificing any space in the generator for arranging the generating coil for driving the original load of the magnet-type AC generator.

Further , according to the present invention, the magnetic pole interval of at least a part of the rotor of the magnet generator is made different from the other magnetic pole interval, or the polar arc angle of at least one magnetic pole of the rotor is set to another magnetic pole. by varying the pole arc angle of the engine 1
Since the positive and negative half-cycle waveforms of the AC voltage in at least one cycle of the plurality of cycles of the AC voltage generated by the generator during rotation are asymmetric, the reference signal generation circuit is provided during one rotation of the engine. The generation intervals between a series of reference signals obtained from the above can be made non-uniform. Therefore, there is an advantage that a specific reference signal can be identified by utilizing the non-uniformity, and a reference position can be easily identified based on the specific reference signal. In this case, since the number of poles of the magnet rotor selected to obtain the AC voltage of a plurality of cycles for driving the electrical component load is not changed at all, the original load of the magnet generator is driven. The reference signal can be obtained without sacrificing the output for the operation.

[Brief description of the drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention.

FIG. 2 is a circuit diagram showing another embodiment of the present invention.

FIG. 3 is a circuit diagram showing still another embodiment of the present invention.

FIG. 4 is a circuit diagram showing a main part of still another embodiment of the present invention.

FIG. 5 is a circuit diagram showing a configuration example of a reference signal generation circuit used in an embodiment of the present invention.

FIG. 6 shows a magnet type alternator attached to an internal combustion engine .
FIG. 2 is a configuration diagram showing a general configuration .

Structure of magnet type AC onset electric machine used in the embodiment of the present invention; FIG
Is a configuration diagram showing formation examples.

FIGS. 8A and 8B are waveform diagrams showing waveforms of voltages obtained by the generator of FIG. 6;

9A is a waveform diagram showing a voltage waveform obtained by the generator of FIG. 6, and FIG. 9B is a waveform diagram showing an example in which the voltage waveform of FIG. 6A is converted into a rectangular wave signal. .

10A is a waveform diagram showing a voltage waveform obtained by the generator shown in FIG. 6, and FIG. 10B is a waveform diagram showing the voltage waveform of FIG. 9A.
It is a waveform diagram showing an example converted into a rectangular wave signal different from the example shown in (B).

FIG. 11A is a waveform chart showing a voltage waveform obtained by the generator of FIG. 7; (B) is a waveform diagram showing an example in which the voltage waveform of (A) is converted into a rectangular wave signal.

FIG. 12 is a waveform diagram showing an example of an output voltage waveform obtained when using an 8-pole magnet AC generator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ignition coil 2 Capacitor 3 Thyristor 4 Power generation coil 5 Diode 6 Spark plug 7 Ignition circuit 8 Ignition position control device 9 CPU 12 Timer 13 Reference signal generation circuit 15 Ignition signal output circuit

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-54-77833 (JP, A) JP-A-63-280865 (JP, A) Fully open Showa 56-52476 (JP, U) Really open Showa 62- 41874 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F02P 3/08 302 F02P 5/15 F02P 7/077

Claims (2)

(57) [Claims] 1. A reference signal generating device for generating a reference signal having a fixed relationship with a rotation angle of an internal combustion engine, and a reference position detecting means for detecting a constant rotation angle position of the internal combustion engine as a reference position from the reference signal. An ignition position measurement time calculating means for calculating a time corresponding to an angle from the reference position to the ignition position at each rotational speed as an ignition position measurement time; and starting the time measurement when the reference position is detected. An ignition device for an internal combustion engine, comprising: an ignition signal generating means for generating an ignition signal when a time equal to the position measurement time is measured; and an ignition circuit for generating a high voltage for ignition when the ignition signal is generated. The reference signal generator includes a magnet rotor configured such that magnetic poles having different polarities are alternately arranged in a circumferential direction and is driven to rotate by an internal combustion engine; and a magnet of the magnet rotor. An armature core having a magnetic pole portion facing the stator, and a stator having a power generating coil wound around the armature core, and an AC voltage for supplying an electrical component load including the ignition circuit. a magneto AC generator output consists of a reference signal generating circuit for detecting a zero point or peak point of the output voltage of the generating coil provided in the magneto AC generator for generating the reference signal, the magnet rotation The number of poles of the rotor is determined during one revolution of the internal combustion engine.
Drive the electrical component load from the magnet type alternator
Normal number of poles required to obtain multiple cycles of AC voltage
At least one of the plurality of cycles of the alternating voltage is selected.
The waveform of the positive and negative half cycles of the AC voltage
At least a portion of the magnet rotor so that
The pole spacing is set to a different size than the other pole spacing,
Or the polar arc angle of at least one magnetic pole of the magnet rotor is
An ignition device for an internal combustion engine, wherein the ignition device is set to a size different from a polar arc angle of another magnetic pole . 2. It has a certain relationship with the rotation angle of the internal combustion engine.
A reference signal generator for generating a reference signal,
Based position location a fixed rotational angular position of the internal combustion engine from No.
Reference position detecting means for detecting, and each rotation from the reference position
The time corresponding to the angle to the ignition position in the number
Ignition position measurement time calculation means for calculating as a measurement time
And start timing when the reference position is detected.
The ignition occurs when a time equal to the ignition position measurement time is measured.
An ignition signal generating means for generating a signal;
An ignition circuit that generates a high voltage for ignition when generated.
In the ignition device for an internal combustion engine, the reference signal generator is configured such that magnetic poles having different polarities are alternately arranged in the circumferential direction.
A magnet rotor rotatably driven by an internal combustion engine
An armature core having a magnetic pole portion facing the magnetic pole of the stone rotor
A stator having a power generating coil wound around the armature core
And supplies a load to electrical components including the ignition circuit.
A magnet-type alternator that outputs an alternating-current voltage for supplying power to the magnet-type alternator;
Generates the reference signal by detecting the zero point or peak point of pressure
A reference signal generation circuit, wherein the reference signal generation circuit converts the output voltage of the power generation coil into a rectangular wave signal whose rise or fall coincides with a zero point or a peak point of the output voltage.
During it has been, rising or falling of the rectangular wave signal obtained from the waveform converting circuit is used as the reference signal, the number of poles of the magnet rotor, wherein the internal combustion engine is rotated 1
Drive the electrical component load from the magnet type alternator
Normal number of poles required to obtain multiple cycles of AC voltage
At least one of the plurality of cycles of the alternating voltage is selected.
The waveform of the positive and negative half cycles of the AC voltage
At least a portion of the magnet rotor so that
The pole spacing is set to a different size than the other pole spacing,
Or the polar arc angle of at least one magnetic pole of the magnet rotor is
Set to a size different from the polar arc angle of other magnetic poles
An ignition device for an internal combustion engine, comprising: