JP3146848B2 - Ignition control method for multi-cylinder 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 control method for an internal combustion engine for controlling ignition of a multi-cylinder internal combustion engine.

[0002]

2. Description of the Related Art As a system for controlling ignition of a multi-cylinder internal combustion engine using a microcomputer, a so-called predicted time control system is known. In this method, an ignition circuit for applying a high voltage to an ignition plug of each cylinder when an ignition signal is given is provided for each cylinder, and the ignition position (for each cylinder) of each cylinder is determined for each rotation speed of the engine. (I.e., the rotation angle position of the engine that ignites the engine), and when the calculated ignition position of each cylinder is detected, an ignition signal is given to the ignition circuit for each cylinder.

To enable detection of the ignition position, a specific rotation angle of the internal combustion engine is determined as a reference position, and the time required for the engine to rotate from the reference position to the ignition position of each cylinder at each rotation speed is determined by each rotation. The ignition position measurement time is calculated each time the engine speed is detected as the ignition position measurement time of each cylinder at the speed. Then, a reference signal is generated at the reference position, measurement of the ignition position measurement time for each cylinder is started when the reference signal is generated, and when measurement of the ignition position measurement time for each cylinder is completed, An ignition signal is given to a cylinder ignition circuit.

[0004] A signal generator is attached to the engine in order to obtain rotation angle information and rotation speed information of a reference position of the engine.
For example, as shown in FIG. 7, the signal generator 1 is attached to a rotating shaft (usually a crankshaft) 2 of the engine and rotates in synchronization with the engine. And a signal generator 4 attached to the unit. The rotor 3 includes a rotating body 3a made of a ferromagnetic material and having an outer peripheral surface formed in a cylindrical shape.
On the outer periphery of a, a reluctor 3b formed of an arc-shaped projection having a constant polar arc angle α is provided. Signal emission 4
Includes a core 4a having a magnetic pole portion 4a1 at the front end facing the rotor 3, a permanent magnet 4b having one magnetic pole connected to the rear end of the core 4a, and a yoke 4c connected to the other magnetic pole of the magnet 4b. And a signal coil 4d wound around the iron core 4a. The yoke 4c integrally has a bracket 4e, and the bracket 4e is fixed to a predetermined mounting portion.
The rotor 3a constituting the rotor 3 may be a dedicated one. In many cases, however, the accessory of the engine such as the flywheel of the flywheel magnet rotor is replaced with the rotor 3a.
The reluctor 3b is formed at a specific portion (for example, an outer peripheral portion or a boss portion of a flywheel) by utilizing the function as a.

In the example shown in FIG. 7, the reluctor is formed of a projection. When the reactor is opposed to the magnetic pole of the signal emission and ends the opposition, it causes a magnetic flux change in the signal emission. Since it is sufficient that the reactor can be formed, the reluctor can be formed by a concave portion.

In the above-described signal generator, when the rotor 3 rotates in synchronization with the rotation of the engine, when the reluctor 3b starts to face the magnetic pole portion 4a1 of the signal generator,
As shown in FIG. 8 (A), pulse signals Vs1 and Vs2 having different polarities are generated in the signal coil 4d due to a change in magnetic flux generated in the iron core 4a at the time of termination of the opposition with the magnetic pole portion 4a1.

When the signal generator as described above is used, the time from when the signal Vs1 is generated at the position of the angle θ1 to when the signal Vs2 is generated at the position of the angle θ2 is Ta, and the rotation speed of the engine is N. , The time Ta and the polar arc angle α of the reluctor 3b.
(Angle interval between signals Vs1 and Vs2), α = 6N
Because of the relationship of Ta, the generation interval T of the signals Vs1 and Vs2
By sampling a as the rotation speed detection time, the rotation speed N of the engine can be obtained.

The microcomputer stores, in its ROM, a map giving the relationship between the engine speed and the ignition position. Each time the engine speed is detected from the engine speed detection time Ta, each cylinder at that engine speed is detected. Is determined by calculation using a map by an interpolation method. In this case, for example, the signal Vs2 is used as a reference signal, its generation position θ2 is used as a reference position, and the time required for the engine to rotate from this reference position to the determined ignition position of each cylinder is calculated as the ignition position measurement time for each cylinder. I do. For example, when the internal combustion engine is a three-cylinder engine, as shown in FIG. 8B, the time required for the engine to rotate from the reference position θ2 to the ignition positions of the first to third cylinders is defined as a first time, respectively. Or as the ignition position measurement times Ti1, Ti2, and Ti3 for the third cylinder. Then, when the reference signal Vs2 is generated (when the reference position is detected), the measurement of the ignition position measurement time Ti1, Ti2, and Ti3 is started, and the position where the measurement of the ignition position measurement time Ti1, Ti2, and Ti3 is completed. The ignition signals Vi1, Vi2, and Vi3 for the first to third cylinders are generated at θi1, θi2, and θi3, respectively. The generation interval of these ignition signals is 12
0 degrees. When the ignition signals Vi1, Vi2 and Vi3 are generated, the ignition circuits for the first to third cylinders respectively generate a high voltage for ignition, and sparks on the ignition plugs respectively attached to the first to third cylinders. Cause.

[0009]

When the predictive control method as described above is employed, after sampling the rotation speed detection time Ta, if the instantaneous rotation speed during one revolution of the engine is constant, each rotation speed is constant. Although the ignition position of each cylinder can be accurately determined as calculated, when the instantaneous rotational speed fluctuates, the ignition position of each cylinder cannot be accurately determined, and the ignition position of each cylinder becomes It will deviate from the regular position.

For example, in the example shown in FIG. 8, if the rotation speed when measuring the ignition position measurement time Ti1 is faster than the rotation speed when sampling the rotation speed detection time Ta, FIG. As shown in (C),
Since the rotation angle during the measurement of the ignition position measurement time Ti1 from the reference position θ2 is larger than when there is no change in the rotation speed, the ignition position θi1 ′ is later than the normal ignition position θi1. Conversely, when the ignition position measurement time Ti1 is measured, the rotation speed is equal to the rotation speed detection time T.
If the rotation speed becomes slower than the rotation speed when a was sampled, the rotation angle during the measurement of the ignition position measurement time from the reference position becomes smaller than when there is no change in the rotation speed. It will advance from the ignition position θi1.

In particular, when the engine is started by a rope start or a kick start, the fluctuation of the rotation speed of the crankshaft during the starting operation (cranking) is very large. The ignition position at the time could not be determined accurately. Therefore, when the ignition control is performed by the predictive control method at the time of starting the engine, there is a problem that startability is deteriorated, and after-fire is generated, and the operation feeling at the time of start is deteriorated. In addition, when the displacement of the ignition position at the time of starting is large, there is a danger that a spark is generated relatively early in the compression stroke and the engine is reversed.

Therefore, conventionally, even when the predictive control method is employed, a signal generator for generating an ignition signal for starting is provided, and each cylinder is provided at a fixed angular position determined by the configuration of the signal generator. An ignition signal is supplied to the ignition circuit of the first embodiment. However, in this case, since it is necessary to generate the ignition signals for starting the number of cylinders, signal emission is required for the number of cylinders, and the cost of the signal generator is not complicated due to the complicated configuration. I couldn't.

SUMMARY OF THE INVENTION It is an object of the present invention to improve the startability by reducing the displacement of the ignition position at the time of starting without complicating the structure of the signal generator, and to generate abnormal phenomena such as reverse rotation starting and afterfire. It is an object of the present invention to provide an ignition control method for a multi-cylinder internal combustion engine, which makes it possible to improve the feeling at the time of starting and improve the safety while preventing the occurrence of the ignition.

[0014]

SUMMARY OF THE INVENTION The present invention relates to an ignition control method for controlling ignition of a multi-cylinder internal combustion engine.

In the ignition control method according to the present invention, n
An ignition circuit for providing a high voltage for ignition to an ignition plug of each cylinder when an ignition signal for each cylinder of the internal combustion engine of the cylinder (n is an integer of 3 or more) is provided for each cylinder,
A signal generator that rotates in synchronization with the internal combustion engine is provided, and a constant rotation angle position of the engine is detected as a reference position from an output signal of the signal generator, and the rotation of the engine is determined based on an interval between generations of output signals of the signal generator. Detect speed. Each time the rotational speed is detected, the ignition position of each cylinder at the detected rotational speed is determined, and the time required for the engine to rotate from the reference position to the determined ignition position of each cylinder is determined by the ignition timing for each cylinder. Calculate as the position measurement time, start the measurement of the ignition position measurement time for each cylinder when the reference position is detected, and when the measurement of the ignition position measurement time for each cylinder is completed, the ignition signal for each cylinder Generate.

In the present invention, the specific position at which the signal generator generates the signal is set equal to the ignition position at the start of nm specific cylinders (m is an integer of 1 or more and less than n) when starting. During a period from the start of the internal combustion engine start operation until the rotation speed of the engine reaches the set value, when the signal generator generates a signal at a specific position, the ignition circuit for nm specific cylinders is used. Only the primary start ignition mode for giving an ignition signal is performed, and after the rotational speed of the engine exceeds the set value, the secondary start ignition mode for giving an ignition signal to the ignition circuits for other cylinders is performed.

In the above-described method, in the second start ignition mode, the ignition positions of the other cylinders are set in order from the cylinder closest to the reference position.
The rotation speed is a predetermined value to start the ignition operation in the cylinder
Increase the number of ignition circuits that give an ignition signal each time
And finally give an ignition signal to all cylinder ignition circuits.
So that In the method of the present invention, ignition is performed only in some of the cylinders at the start of the engine start operation, a process in which the rotation at the start of the engine shifts to a stable state is detected, and when the rotation is stabilized to some extent, From primary start ignition mode to second
A switch to the next start ignition mode is performed.
In the above configuration, the process of transition of the rotation of the engine to a stable state is detected by detecting the rotation speed of the engine, but this detection may be performed by another method. For example,
A process in which the rotation of the engine shifts to a stable state may be detected based on a lapse of time after the start operation is started.

That is, during a period from the start of the start operation of the internal combustion engine to the elapse of the set time, when the signal generator generates a signal at a specific position, the ignition for the nm specific cylinders is performed. A primary start ignition mode in which an ignition signal is applied only to the circuit is performed, and a secondary start ignition mode in which an ignition signal is supplied to the ignition circuits of other cylinders after a set time has elapsed after the start operation is started. You may make it do.

[0019] In this case also the second-order starting ignition mode, point
Ignition in other cylinders in order from the cylinder whose ignition position is closer to the reference position
The rotation speed increases by a predetermined value to start the operation
Increase the number of ignition circuits that give an ignition signal
To the ignition circuit for all cylinders.
You. Further, a throttle opening detecting means for detecting an opening of a throttle valve for adjusting a fuel supply amount to the internal combustion engine as a throttle opening is provided, and the throttle opening is set after a start operation of the internal combustion engine is started. Until the signal reaches the value, when the signal generator generates a signal at a specific position, an ignition signal is given only to the ignition circuits for nm specific cylinders, and the throttle opening reaches the set value. Later, an ignition signal may be given to the ignition circuit of another cylinder.

[0020] In this case also the second-order starting ignition mode, point
Ignition in other cylinders in order from the cylinder whose ignition position is closer to the reference position
The rotation speed increases by a predetermined value to start the operation
Increase the number of ignition circuits that give an ignition signal
To the ignition circuit for all cylinders.
You. In the first start ignition mode, the ignition signal given to the nm specific cylinders may be an ignition signal generated when the signal generator generates a signal at a specific rotation angle position. The method of generating the signal is arbitrary. For example, an ignition signal to be given to an ignition circuit for a specific cylinder in the first starting ignition mode may be obtained by shaping a signal generated at a specific rotation angle position by a signal generator.
When a signal generator generates a signal at a specific rotation angle position, an ignition signal to be given to an ignition circuit for a specific cylinder may be generated on software of a microcomputer.

In the second start ignition mode, n-
The ignition signal given to the m specific cylinders may be an ignition signal generated when the signal generator generates a signal, or may be an ignition signal generated by measuring an ignition position measurement time.

In the present invention, the number of cylinders that can be ignited in the first starting ignition mode is determined by the number of signals that can generate one signal emission signal. As shown in FIG. 7, when one signal generator is provided in a signal generator using a rotor having one reluctor, two signals are generated per rotation, so that these two signals are generated. By setting the occurrence positions equal to the ignition positions of the first cylinder and the second cylinder at the time of starting, respectively, two cylinders can be ignited in the first starting ignition mode.

Even if two signals can be obtained per revolution from the signal generator, it is not always necessary to ignite the two cylinders in the first start ignition mode. One of the signals may be set equal to the ignition position at the time of starting a specific cylinder, and the ignition may be performed only in the specific one cylinder in the first start ignition mode.

In the present invention, in the first starting ignition mode, it is preferable to detect each instantaneous rotational speed of the engine, and therefore, the signals are successively generated at a small angular interval among a plurality of signals generated by the signal generator. Preferably, the rotational speed is detected by measuring the time interval of the signal. For example, when the signal generator generates the first and second signals Vs1 and Vs2 at the first rotation angle position θ1 and the second rotation angle position θ2, respectively, as shown in FIG. Signal Vs2
It is preferable to detect the rotation speed in the start ignition mode by measuring the time Ta between the start and the start.

The method of detecting the rotational speed of the engine during a steady operation is arbitrary. By measuring any one of a plurality of signals generated by the signal generator during one rotation of the engine, the interval of generation is measured. The rotation speed may be detected. For example, in FIG. 3A, the rotation speed may be detected from the time from the generation of each signal Vs1 to the generation of the next signal Vs1 (the time required for the engine to make one rotation).

[0026]

According to the above method, when the signal generator generates a signal at a specific rotation angle position at the time of starting the engine, an ignition signal is sent to the ignition circuit for the mn cylinder among the ignition circuits for the n cylinder. Given. The position where the signal generator generates the signal is
Since these are determined by the mechanical configuration of the signal generator, these n
The ignition position at the start of the −m cylinder is always constant, and the ignition operation is performed at the proper ignition position suitable for the start. nm
When ignition is performed in the individual cylinders, the rotational speed of the engine increases. Predictive control (control to determine the ignition position by measuring the ignition position measurement time, because the engine speed stabilizes as the engine speed increases and the instantaneous fluctuations in the speed decrease. ) Becomes possible. Therefore, in the method of the present invention, after the engine is started by igniting a specific number of nm cylinders, the rotation speed of the engine changes to a set value (a rotation speed that does not hinder the prediction control). When it exceeds, measurement of the ignition position measurement time is started, and an ignition signal is also supplied to the ignition circuits for other cylinders, thereby increasing the number of cylinders to be ignited and stabilizing the rotation.

As described above, if the ignition signal is supplied to only some of the cylinders at the start of the start, the signal generator does not need to generate the ignition signals for all the cylinders. Can be simplified.

Since the error in predicting and controlling the ignition position is smaller as the ignition position measurement time is shorter, even if the rotation of the cylinder whose ignition position is closer to the reference position is not so stable (the engine after the start is started). It is possible to determine the ignition position by predictive control (even when the rotational speed of the motor is not so increased). On the other hand, for a cylinder whose ignition position is far from the reference position, the ignition position measurement time becomes longer. Therefore, in order to reduce the error in the ignition position when the ignition position is determined by predictive control, it is necessary to reduce the engine rotation. We have to wait until the speed has increased to some extent and the rotation has stabilized.

Therefore, in order to smoothly start the engine, after igniting only the nm specific cylinders and starting the engine, the ignition position is set to the reference position in a region where the engine speed exceeds the set value. In order to start the ignition degree operation in the other cylinders in order from the cylinder close to, the number of ignition circuits for the other cylinders for giving an ignition signal every time the rotation speed increases by a predetermined value is increased. Is preferred. In this case, n
The engine can be started smoothly by shortening the period in which ignition is performed only in some of the -m cylinders.

It should be noted that the present invention is not limited to the case where the number of ignition circuits for giving an ignition signal is increased stepwise when the rotation speed of the engine exceeds a set value after the start, as described above. Instead, by setting the set value of the rotational speed at which the predictive control is started to be somewhat large, it is possible to start ignition of all cylinders when the rotational speed of the engine exceeds the set value.

In the above description, the ignition mode at the time of starting is changed from the primary ignition mode to the second ignition mode in accordance with the increase in the rotational speed of the engine.
Although the mode was switched to the next ignition mode, the first start ignition mode was performed until the elapsed time reached the set value, and the elapsed time from the time when the start operation was started was performed. The same effect can be obtained when the mode is shifted to the secondary start ignition mode after exceeding the set value.

In general, when starting the engine, the starting operation is started with the throttle valve being throttled, and the throttle valve is opened in accordance with the progress of the engine starting process.
The same effect as described above can be obtained by detecting the opening of the throttle valve and switching the starting ignition mode in accordance with the increase in the opening.

[0033]

FIG. 1 shows an example of the configuration of hardware of an ignition device for carrying out an ignition control method according to the present invention. In FIG. 1, reference numeral 1 denotes a signal generator mounted on an output shaft of an engine. The signal generator 1 is the same as that shown in FIG. 7, and includes a rotor 3 having a reluctor 3b, a signal coil 4d wound around an iron core 4a, and a magnet 4 magnetically coupled to the iron core.
b, and generates a first signal Vs1 and a second signal Vs2 having waveforms as shown in FIG. 3A with respect to the rotation angle θ of the engine. The position where the first signal Vs1 is generated is defined as a first rotational angle position θ1, and the position where the second signal Vs2 is generated is defined as a second rotational angle position θ2.

In this specification, the signal generation position is
The point at which the signal reaches a level recognizable by the circuit, and the point at which the signal reaches a predetermined threshold level. In the waveform diagrams of FIGS. 3 and 4, a position where the signal reaches a peak is defined as a signal generation position for convenience. 3 and 4, the number n of cylinders of the engine is four.

In FIG. 1, U1 to Un are ignition circuits for the first to n-th cylinders provided for the first to n-th cylinders of the internal combustion engine of n cylinders (n is an integer of 3 or more). , These ignition circuits are respectively ignition coils IG1 to IG1.
IGn. The ignition circuits U1 to Un for the first to n-th cylinders control the primary current of the ignition coils IG1 to IGn when an ignition signal is given to each of them to cause a sudden change in the primary current. This change in the primary current induces a high voltage for ignition in the secondary coils of the ignition coils IG1 to IGn. Outputs of the respective secondary coils of the ignition coils IG1 to IGn are applied to ignition plugs P1 to Pn of the first to nth cylinders. As the ignition circuit, a capacitor discharge type circuit and a current cutoff type circuit are known, but any type of ignition circuit may be used in the present invention.

The output of the signal coil 4d is supplied to the waveform shaping circuit 11
And 12, and the first signal Vs1 and the second signal Vs2 shown in FIG. 3A are respectively converted into the first pulse shown in FIGS. 3B and 3C by these waveform shaping circuits. The signal is converted into a signal Vp1 and a second pulse signal Vp2. These pulse signals Vp1 and Vp2 are respectively applied to OR circuit OR1.
And OR2, the ignition circuit U1 for the first cylinder and the second
The ignition signals Vi1 (FIG. 3D) and Vi are applied to the cylinder ignition circuit U2.
2 (FIG. 3E).

Reference numeral 15 denotes a microcomputer for controlling the ignition position, and includes a CPU 16, a RAM 17, and a ROM 18.
, Counter 19, comparator 20, register 2
1 is provided. Although only one comparator 20 and one register 21 are shown in FIG. 1, these are provided for the number of cylinders. The signal obtained from the signal coil 4d is converted into a signal recognizable by a microcomputer by the waveform shaping circuit 13 and input to the CPU 16. The CPU executes a series of processes of the ignition control according to a predetermined program stored in the ROM.

The CPU 16 calculates the rotational speed of the engine from the time Ta from when the first signal Vs1 is generated to when the second signal Vs2 is generated, and stores the calculation result in the RAM. This process implements a rotation speed detecting means.
Each time the rotational speed is detected, the CPU uses the map for determining the ignition position (table giving the relationship between the rotational speed and the ignition position) stored in the ROM by an interpolation method for each cylinder at each rotational speed. The ignition position is calculated and determined. The ignition position of each cylinder is calculated in the form of the time required for the engine to rotate from the reference position to the ignition position of each cylinder at the detected rotational speed (ignition position measurement time),
The calculation result is stored in the RAM.

The CPU 16 also determines a reference signal from a signal input through the waveform shaping circuit 13 and, during normal operation, detects the occurrence of the reference signal and measures the ignition position measurement time (reference position) for each cylinder. ) Is transferred to the register 21 for each cylinder, and at the same time, the counter 19 is started. In the present embodiment, the second signal Vs2 is used as a reference signal, and the generation position of the second signal (second
Rotation angle position) θ2 as a reference position.

The comparator 20 for each cylinder compares the count value of the counter with the ignition position measurement time for each cylinder.
When they match, an ignition position detection signal for each cylinder is generated. The CPU 16 supplies an ignition command signal for each cylinder to the ignition signal supply circuit 22 when an ignition position detection signal for each cylinder is generated. The ignition signal supply circuit 22 receives an ignition command signal for each cylinder from the CPU 16. And outputs an ignition signal for the corresponding cylinder. Of the ignition signals output by the ignition signal supply circuit 22, the ignition signals Vi1 'and Vi2' for the first cylinder and the second cylinder are passed through OR circuits OR1 and OR2 as ignition signals Vi1 and Vi2, respectively.
1 and U2. Also, the ignition signals Vi3 to Vin
Are respectively applied directly to the ignition circuits U3 to Un.

In FIG. 1, reference numeral 23 denotes a hard / soft switching circuit. This switching circuit bypasses the outputs of the waveform shaping circuits 11 and 12 from the OR circuits OR1 and OR2 when a switching command is given from the CPU 16. Ignition circuit U from the waveform shaping circuits 11 and 12 (from the signal generator side)
The ignition signal is supplied to the ignition circuits U1 and U2 from the ignition signal supply circuit 22 by preventing the ignition signal from being supplied to 1 and U2. The hard / soft switching circuit 23 can be constituted by a bypass switch such as a transistor which is connected in parallel between the output terminals of the waveform shaping circuits 11 and 12 and becomes conductive when a switching command signal is given from the CPU 16.

In the ignition control method according to the present embodiment, the signal generator 1 determines the first rotational angular positions θ1 and θ2 at which the first signal Vs1 and the second signal Vs2 are generated, respectively, in the first rotational position. The ignition position θi1 of the cylinder and the ignition position θi2 of the second cylinder are set equal to each other, and the starting ignition mode is performed when the engine is started. In the start ignition mode, as described below, the first start ignition mode and the second start ignition mode are sequentially performed, and after it is confirmed that the engine has been started, the ignition mode is switched to the steady-state ignition. Switch to mode. In this case, the polar arc angle α of the retractor 3b of the rotor of the signal generator is 360 / n degrees (n is the number of cylinders).

In the first start ignition mode, the ignition circuits U1 to Un are ignited from the CPU side through the ignition signal supply circuit 22 from the start of the operation of the internal combustion engine until the rotation speed of the engine reaches the set value. When signals are prevented from being applied and the signal generator 1 generates the signals Vs1 and Vs2 at the first rotation angle position θ1 and the second rotation angle position θ2, respectively, FIGS. As shown in FIG. 5, the ignition circuit U1 for the first cylinder and the ignition circuit U2 for the second cylinder
Only give the ignition signal. In order to prevent the CPU from receiving the ignition signal, for example, the ignition position measurement time is not transferred to the register 21 when the reference signal is generated (the ignition position measurement time is not measured). Alternatively, the ignition command measurement signal may be measured, but the ignition command signal is not supplied to the ignition signal supply circuit 22 when the comparator 20 generates the ignition position detection signal.

The position at which the output signal of the signal generator 1 is generated is determined by the mechanical configuration of the generator and is constant irrespective of the rotational speed, so that the first cylinder and the second cylinder in the first start ignition mode are used. The ignition position of the cylinder is always constant, and ignition is performed at an ignition position suitable for starting the engine. Since the internal combustion engine starts even if one cylinder is ignited,
The engine starts rotating. As the engine speed increases, the engine speed stabilizes and fluctuations in the engine speed at each moment decrease, so the ignition position must be determined by predictive control (measurement of the ignition position measurement time Thereby determining the ignition position for each cylinder).

Therefore, in the present embodiment, a second starting ignition mode in which an ignition signal is also supplied to ignition circuits for cylinders other than the first cylinder and the second cylinder after the rotational speed of the engine exceeds the set value No. Is performed. In the example of FIG. 3, the secondary start ignition mode is started when the rotation speed of the engine becomes equal to or higher than the set value No. First, as shown in the right half of FIG. To the ignition signal Vi3. Next, when the rotation speed becomes equal to or higher than the set value N1, an ignition signal Vi4 is supplied to the ignition circuit of the fourth cylinder as shown at the right end of FIG.

In the secondary start ignition mode, as described above, the ignition operation is started from the cylinder having the smaller angle from the reference position to the ignition position (the cylinder having the shorter ignition position measurement time). Is preferred.

When it is detected that the rotation speed of the engine has reached the startup completion rotation speed as a result of performing the secondary startup ignition mode, the CPU 16 sends the hardware / software switching circuit 23
And the output of the waveform shaping circuits 11 and 12 is bypassed from the OR circuits OR1 and OR2, so that the ignition signal is supplied from the CPU 16 through the ignition signal supply circuit 22 so that the ignition mode is set to a steady state. Switch to fire mode.

FIG. 5 is a flowchart showing a control algorithm when the ignition of the n-cylinder internal combustion engine is controlled by the ignition control method of this embodiment. In FIG. 5, "hard ignition" means that an ignition signal generated by passing an output signal of the signal generator 1 through a waveform shaping circuit (hardware circuit) is given to an ignition circuit to cause ignition. "Soft ignition" means that ignition is performed by giving an ignition signal generated by measuring an ignition position measurement time using software to an ignition circuit.

In the example of FIG. 5, in the first starting ignition mode, first, an ignition signal is given to the ignition circuits for the first cylinder and the second cylinder by the output signal of the signal generator to ignite these cylinders. Next, when the rotation speed N becomes equal to or higher than the first set value No, the second start ignition mode is started. This second
In the next start ignition mode, the measurement of the ignition position measurement time for the third cylinder is started when it is detected that the reference signal has been generated, and the ignition signal for the third cylinder is sent to the ignition circuit for the third cylinder when the measurement is completed. give. Next, the rotation speed N is set to the set value N1.
(> No), the measurement of the ignition position measurement time for the fourth cylinder is started at the reference position, and when the measurement of the measurement time is completed, an ignition signal is given to the ignition circuit for the fourth cylinder. To ignite the fourth cylinder.

When the ignition is performed up to the final cylinder and the rotation speed N becomes equal to or higher than the start completion rotation speed Ns, a switching command signal is given to the hard / soft switching circuit 23, and the waveform shaping circuit 1
The ignition signals are prevented from being supplied to the ignition circuits U1 and U2 from the sides 1 and 12, and the ignition mode is shifted to the steady-state ignition mode.

In the present embodiment, the starting time ignition control means is realized by the process of performing the primary starting ignition mode and the secondary starting ignition mode, respectively. Control means is realized.

When the rotation speed exceeds Ns, a switching command signal is supplied to the hard / soft switching circuit 23 to shift the ignition mode to the steady-state ignition mode. Mode switching means is realized.

In the steady-state ignition mode, as shown in FIGS. 4A to 4G, the measurement of the ignition position measurement times Ti1 to Ti4 is started at the reference position θ2, and the measurement of these measurement times is completed. Occasionally, ignition signals Vi1 to Vi4 are given to the ignition circuits for the first to fourth cylinders, respectively.

In the above-described embodiment, in the first start ignition mode, the output of the signal generator is passed through the waveform shaping circuit to obtain the ignition signals for the first and second cylinders. In the ignition mode, the signal generator
When s1 and Vs2 are generated, the ignition signals for the first cylinder and the second cylinder may be generated on software. FIG. 2 shows a hardware configuration in the case where the ignition signals for the first cylinder and the second cylinder are generated on software in the first start ignition mode, and FIG. 6 shows a control algorithm in that case. I have. The configuration of the ignition device shown in FIG. 2 is the same as the configuration of the ignition device shown in FIG. 1 except that the waveform shaping circuits 11 and 12 and the OR circuits OR1 and OR2 in FIG. 1 are omitted.

The flowchart of FIG. 6 is the same as that shown in FIG. 5 except that the ignition signal for the first cylinder and the ignition signal for the second cylinder are generated on the software in the first start ignition mode. is there. In FIG. 6, "soft start ignition position" means an ignition position at the start of start determined by an ignition signal generated by detecting on a software that a signal generator has generated a signal. Other points are the same as those shown in FIG.

In the above-described embodiment, in the secondary start ignition mode, other cylinders that provide an ignition signal in accordance with an increase in engine speed (cylinders other than the cylinders that perform ignition in the primary start ignition mode) The number of ignition circuits for the cylinders is increased stepwise so that an ignition signal is finally given to the ignition circuits for all the cylinders. However, in the secondary start ignition mode,
An ignition signal may be given to all cylinder ignition circuits regardless of the rotational speed of the engine.

In the above embodiment, in order to detect a process in which the rotation of the engine shifts to a stable state at the time of starting, the rotation speed of the engine is detected, and every time the rotation speed reaches a predetermined set value, the primary Switching from the starting ignition mode to the secondary starting ignition mode, switching of the number of cylinders to which an ignition signal is given in the secondary starting ignition mode, and switching from the starting ignition mode to the steady ignition mode are performed. However, in the present invention, a method for detecting a process in which the rotation at the time of starting shifts to a stable state is as follows:
The method is not limited to the method of detecting the rotation speed. For example, a process in which the rotation of the engine shifts to a stable state may be detected based on the elapsed time from the start operation start time. In this case, the timer is started simultaneously with the start of the start operation, and the elapsed time Tx from the start operation start time is measured.
The mode is switched at any time according to x. Further, a means for detecting the opening degree of the throttle valve may be provided, and the mode may be switched according to the increase in the throttle opening degree.

In the above embodiment, the flow chart in the case where the mode is switched in accordance with the elapsed time from the start of the starting operation is obtained by replacing "rotation speed" with "elapsed time" in FIG. 5 or FIG. Also, the flowchart for switching the mode according to the throttle opening is as follows:
In FIG. 5 or FIG. 6, "rotation speed" is replaced by "throttle opening".

In the above embodiment, the first cylinder and the second cylinder are ignited in the first start ignition mode. However, only the first cylinder or the second cylinder may be ignited. Generally, in the first start ignition mode,
What is necessary is just to make it perform the ignition operation in nm (1 <= m <n) cylinders.

The embodiments of the present invention have been described above. Main embodiments of the present invention disclosed in the present specification are listed below.

(1) When an ignition signal for each cylinder of an internal combustion engine of n cylinders (n is an integer of 3 or more) is given, an ignition circuit for applying a high voltage for ignition to an ignition plug of each cylinder is provided for each cylinder. Is provided, a signal generator that rotates in synchronization with the internal combustion engine is provided, and a constant rotation angle position of the engine is detected as a reference position from an output signal of the signal generator, and the signal generator The rotation speed of the engine is detected from the interval of generation of the output signal, and the ignition position of each cylinder at the detected rotation speed is determined every time the rotation speed is detected, and the ignition position of each cylinder determined from the reference position is determined. The time required for the engine to rotate is calculated as the ignition position measurement time for each cylinder,
A multi-cylinder internal combustion engine that starts measuring the ignition position measurement time for each cylinder when the reference position is detected, and generates an ignition signal for each cylinder when the measurement of the ignition position measurement time for each cylinder is completed. An ignition control method for an engine, wherein a specific position at which the signal generator generates a signal is equal to an ignition position at the start of nm specific cylinders (m is an integer of 1 or more and less than n). After the start operation of the internal combustion engine is started, the ignition mode is set to a start time ignition mode until the engine speed reaches the start completion rotation speed, and the ignition mode is switched to the steady time ignition after reaching the start completion rotation speed. In the steady-state ignition mode, the ignition position measurement time for all cylinders is measured and the ignition circuit for each cylinder is set at the position where the measurement of the ignition position measurement time for each cylinder is completed. Give the ignition signal and Wherein until the rotational speed reaches the set value after the start operation of the engine is started in the starting ignition mode at the position where the signal generator generates a signal n-m
A first starting ignition mode for giving an ignition signal to the ignition circuits for the specific cylinders is performed, and the signal generator generates a signal after the rotation speed of the engine exceeds a set value in the starting ignition mode. The ignition signal is supplied to the ignition circuit for the specific cylinder at the position where the ignition is performed, and the ignition position measurement time for the other cylinder is measured, and the ignition for the other cylinder is completed at the position where the measurement of the measurement time is completed. An ignition control method for a multi-cylinder internal combustion engine, wherein a second starting ignition mode for giving an ignition signal to a circuit is also performed.

(2) When an ignition signal for each cylinder of an internal combustion engine of n cylinders (n is an integer of 3 or more) is given, an ignition circuit for applying a high voltage for ignition to an ignition plug of each cylinder is provided for each cylinder. Is provided, a signal generator that rotates in synchronization with the internal combustion engine is provided, and a constant rotation angle position of the engine is detected as a reference position from an output signal of the signal generator, and the signal generator The rotation speed of the engine is detected from the interval of generation of the output signal, and the ignition position of each cylinder at the detected rotation speed is determined every time the rotation speed is detected, and the ignition position of each cylinder determined from the reference position is determined. The time required for the engine to rotate is calculated as the ignition position measurement time for each cylinder,
A multi-cylinder internal combustion engine that starts measuring the ignition position measurement time for each cylinder when the reference position is detected, and generates an ignition signal for each cylinder when the measurement of the ignition position measurement time for each cylinder is completed. An ignition control method for an engine, wherein a specific position at which the signal generator generates a signal is equal to an ignition position at the start of nm specific cylinders (m is an integer of 1 or more and less than n). After the start operation of the internal combustion engine is started, the ignition mode is set to a start time ignition mode until the rotation speed of the engine reaches the startup completion rotation speed, and ignition is performed after the rotation speed of the engine reaches the startup completion rotation speed. The mode is switched to the steady-state ignition mode. In the steady-state ignition mode, the ignition position measurement time is measured to supply an ignition signal to all cylinder ignition circuits. From the start of the operation of the engine until the rotation speed of the engine reaches the set value, when the signal generator generates a signal at a specific position, the ignition circuit for the nm specific cylinders is generated. To perform a primary start ignition mode for giving an ignition signal, and after the engine speed exceeds a set value in the start time ignition mode, measure the ignition position measurement time for all cylinders. An ignition control method for a multi-cylinder internal combustion engine, wherein a second start ignition mode for giving an ignition signal to an ignition circuit for each cylinder is performed at a position where measurement of an ignition position measurement time for each cylinder has been completed.

(3) When an ignition signal for each cylinder of an internal combustion engine of n cylinders (n is an integer of 3 or more) is given, an ignition circuit for applying a high voltage for ignition to a spark plug of each cylinder is provided for each cylinder. Is provided, a signal generator that rotates in synchronization with the internal combustion engine is provided, and a constant rotation angle position of the engine is detected as a reference position from an output signal of the signal generator, and the signal generator The rotation speed of the engine is detected from the interval of generation of the output signal, and the ignition position of each cylinder at the detected rotation speed is determined every time the rotation speed is detected, and the ignition position of each cylinder determined from the reference position is determined. The time required for the engine to rotate is calculated as the ignition position measurement time for each cylinder,
A multi-cylinder internal combustion engine that starts measuring the ignition position measurement time for each cylinder when the reference position is detected, and generates an ignition signal for each cylinder when the measurement of the ignition position measurement time for each cylinder is completed. An ignition control method for an engine, wherein a specific position at which the signal generator generates a signal is equal to an ignition position at the start of nm specific cylinders (m is an integer of 1 or more and less than n). After the start operation of the internal combustion engine is started, the ignition mode is set to a start time ignition mode until the rotation speed of the engine reaches the startup completion rotation speed, and ignition is performed after the rotation speed of the engine reaches the startup completion rotation speed. The mode is switched to the steady-state ignition mode, and in the steady-state ignition mode, the ignition position measurement time for all cylinders is measured, and each cylinder is measured at the position where the measurement of the ignition position measurement time for each cylinder is completed. For ignition circuit for A signal, and the signal generator generates a signal at a specific position from the start of the internal combustion engine in the ignition mode at the start until the rotation speed of the engine reaches a set value. Performing a first starting ignition mode in which an ignition signal is supplied to the ignition circuits for m specific cylinders, and after the engine speed exceeds a set value in the starting time ignition mode, the signal generator When a signal is generated at the position of (i), an ignition signal is given to the ignition circuits for the aforementioned nm specific cylinders, and the measurement of the ignition position measurement time for the other cylinders is performed. Accordingly, the number of ignition circuits for other cylinders for providing an ignition signal is increased in a stepwise manner, and finally, the second start ignition mode for providing an ignition signal to all of the ignition circuits for the cylinders is performed. For multi-cylinder internal combustion engines Your way.

(4) When an ignition signal for each cylinder of an internal combustion engine of n cylinders (n is an integer of 3 or more) is given, an ignition circuit for applying a high voltage for ignition to a spark plug of each cylinder is provided for each cylinder. Is provided, a signal generator that rotates in synchronization with the internal combustion engine is provided, and a constant rotation angle position of the engine is detected as a reference position from an output signal of the signal generator, and the signal generator The rotation speed of the engine is detected from the interval of generation of the output signal, and the ignition position of each cylinder at the detected rotation speed is determined every time the rotation speed is detected, and the ignition position of each cylinder determined from the reference position is determined. The time required for the engine to rotate is calculated as the ignition position measurement time for each cylinder,
A multi-cylinder internal combustion engine that starts measuring the ignition position measurement time for each cylinder when the reference position is detected, and generates an ignition signal for each cylinder when the measurement of the ignition position measurement time for each cylinder is completed. An ignition control method for an engine, wherein a specific position at which the signal generator generates a signal is equal to an ignition position at the start of nm specific cylinders (m is an integer of 1 or more and less than n). After the start operation of the internal combustion engine is started, the ignition mode is set to a start time ignition mode until the rotation speed of the engine reaches the startup completion rotation speed, and ignition is performed after the rotation speed of the engine reaches the startup completion rotation speed. The mode is switched to the steady-state ignition mode, and in the steady-state ignition mode, the ignition position measurement time for all cylinders is measured, and each cylinder is measured at the position where the measurement of the ignition position measurement time for each cylinder is completed. For ignition circuit for A signal, and the signal generator generates a signal at a specific position from the start of the internal combustion engine in the ignition mode at the start until the rotation speed of the engine reaches a set value. Performing a first starting ignition mode for giving an ignition signal to the m number of ignition circuits for the specific cylinders, and after the engine rotation speed exceeds a set value in the starting time ignition mode, the ignition position for each cylinder At the position where measurement of the measurement time has been completed, an ignition signal is given to the ignition circuit for each cylinder, and the number of ignition circuits that give the ignition signal in accordance with an increase in the engine speed gradually increases. An ignition control method for a multi-cylinder internal combustion engine, wherein a secondary start ignition mode for giving an ignition signal to all cylinder ignition circuits is performed.

(5) When an ignition signal for each cylinder of an internal combustion engine of n cylinders (n is an integer of 3 or more) is given, an ignition circuit for applying a high voltage for ignition to a spark plug of each cylinder is provided for each cylinder. Is provided, a signal generator that rotates in synchronization with the internal combustion engine is provided, and a constant rotation angle position of the engine is detected as a reference position from an output signal of the signal generator, and the signal generator The rotation speed of the engine is detected from the interval of generation of the output signal, and the ignition position of each cylinder at the detected rotation speed is determined every time the rotation speed is detected, and the ignition position of each cylinder determined from the reference position is determined. The time required for the engine to rotate is calculated as the ignition position measurement time for each cylinder,
A multi-cylinder internal combustion engine that starts measuring the ignition position measurement time for each cylinder when the reference position is detected, and generates an ignition signal for each cylinder when the measurement of the ignition position measurement time for each cylinder is completed. An ignition control method for an engine, wherein a specific position at which the signal generator generates a signal is equal to an ignition position at the start of nm specific cylinders (m is an integer of 1 or more and less than n). After the start operation of the internal combustion engine is started, the ignition mode is set to a start time ignition mode until a certain time elapses, and after a certain time elapses after the start operation is started, the ignition mode is changed to a steady time fire mode. In the steady-state ignition mode, the ignition position measurement time for all cylinders is measured, and the ignition circuit for each cylinder is ignited at the position where the measurement of the ignition position measurement time for each cylinder is completed. Give a signal and start In the ignition mode, an ignition signal is applied to the ignition circuit for the specific number of the n-m cylinders at a position where the signal generator generates a signal until a set time elapses after the start operation of the engine is started. A primary start ignition mode is performed, and after a set time has elapsed after the start operation of the engine in the start time ignition mode, the ignition circuit for the specific cylinder is ignited at a position where the signal generator generates a signal. A second starting ignition mode in which a signal is given and the ignition position measurement time for the other cylinder is measured, and the ignition signal for the other cylinder is also given an ignition signal at the position where the measurement of the measurement time is completed. An ignition control method for a multi-cylinder internal combustion engine, the method being performed.

(6) An ignition circuit for applying a high voltage for ignition to an ignition plug of each cylinder when an ignition signal for each cylinder of an internal combustion engine of n cylinders (n is an integer of 3 or more) is provided. Is provided, a signal generator that rotates in synchronization with the internal combustion engine is provided, and a constant rotation angle position of the engine is detected as a reference position from an output signal of the signal generator, and the signal generator The rotation speed of the engine is detected from the interval of generation of the output signal, and the ignition position of each cylinder at the detected rotation speed is determined every time the rotation speed is detected, and the ignition position of each cylinder determined from the reference position is determined. The time required for the engine to rotate is calculated as the ignition position measurement time for each cylinder,
A multi-cylinder internal combustion engine that starts measuring the ignition position measurement time for each cylinder when the reference position is detected, and generates an ignition signal for each cylinder when the measurement of the ignition position measurement time for each cylinder is completed. An ignition control method for an engine, wherein a specific position at which the signal generator generates a signal is equal to an ignition position at the start of nm specific cylinders (m is an integer of 1 or more and less than n). After the start operation of the internal combustion engine is started, the ignition mode is set to a start time ignition mode until a certain time elapses, and after a certain time elapses after the start operation is started, the ignition mode is changed to a steady time fire mode. In the steady-state ignition mode, an ignition signal is given to the ignition circuits for all cylinders by measuring the ignition position measurement time, and the starting operation of the internal combustion engine is started in the start-time ignition mode. Until the set time elapses after the start-up, the first starting ignition for providing an ignition signal to the ignition circuit for the nm specific cylinders when the signal generator generates a signal at a specific position. After the set time has elapsed after the start operation is started in the start time ignition mode, the measurement of the ignition position measurement time for all cylinders is started, and the ignition position measurement time for each cylinder is calculated. An ignition control method for a multi-cylinder internal combustion engine, wherein a second starting ignition mode for giving an ignition signal to an ignition circuit for each cylinder at a position where measurement has been completed is performed.

(7) When an ignition signal for each cylinder of an internal combustion engine of n cylinders (n is an integer of 3 or more) is given, an ignition circuit for applying a high voltage for ignition to a spark plug of each cylinder is provided for each cylinder. Is provided, a signal generator that rotates in synchronization with the internal combustion engine is provided, and a constant rotation angle position of the engine is detected as a reference position from an output signal of the signal generator, and the signal generator The rotation speed of the engine is detected from the interval of generation of the output signal, and the ignition position of each cylinder at the detected rotation speed is determined every time the rotation speed is detected, and the ignition position of each cylinder determined from the reference position is determined. The time required for the engine to rotate is calculated as the ignition position measurement time for each cylinder,
A multi-cylinder internal combustion engine that starts measuring the ignition position measurement time for each cylinder when the reference position is detected, and generates an ignition signal for each cylinder when the measurement of the ignition position measurement time for each cylinder is completed. An ignition control method for an engine, wherein a specific position at which the signal generator generates a signal is equal to an ignition position at the start of nm specific cylinders (m is an integer of 1 or more and less than n). After the start operation of the internal combustion engine is started, the ignition mode is set to a start time ignition mode until a certain time elapses, and after a certain time elapses after the start operation is started, the ignition mode is changed to a steady time fire mode. In the steady-state ignition mode, the ignition position measurement time for all cylinders is measured, and the ignition circuit for each cylinder is ignited at the position where the measurement of the ignition position measurement time for each cylinder is completed. Give a signal and start In the ignition mode, the ignition circuit for the nm specific cylinders is generated when the signal generator generates a signal at a specific position until the set time elapses after the start operation of the internal combustion engine is started. In the starting ignition mode, after a set time has elapsed after the start operation of the engine, the signal generator generates a signal at a specific position. The other cylinders that supply an ignition signal to the nm specific ignition circuits for the specific cylinders, measure the ignition position measurement time for the other cylinders, and supply the ignition signal with an increase in the engine speed. Control method for a multi-cylinder internal combustion engine, characterized in that the number of ignition circuits for the cylinders is increased in a stepwise manner, and a secondary start ignition mode for finally giving an ignition signal to all cylinder ignition circuits is performed. .

(8) When an ignition signal for each cylinder of an internal combustion engine of n cylinders (n is an integer of 3 or more) is given, an ignition circuit for applying a high voltage for ignition to a spark plug of each cylinder is provided for each cylinder. Is provided, a signal generator that rotates in synchronization with the internal combustion engine is provided, and a constant rotation angle position of the engine is detected as a reference position from an output signal of the signal generator, and the signal generator The rotation speed of the engine is detected from the interval of generation of the output signal, and the ignition position of each cylinder at the detected rotation speed is determined every time the rotation speed is detected, and the ignition position of each cylinder determined from the reference position is determined. The time required for the engine to rotate is calculated as the ignition position measurement time for each cylinder,
A multi-cylinder internal combustion engine that starts measuring the ignition position measurement time for each cylinder when the reference position is detected, and generates an ignition signal for each cylinder when the measurement of the ignition position measurement time for each cylinder is completed. An ignition control method for an engine, wherein a specific position at which the signal generator generates a signal is equal to an ignition position at the start of nm specific cylinders (m is an integer of 1 or more and less than n). After the start operation of the internal combustion engine is started, the ignition mode is set to a start time ignition mode until a certain time elapses, and after a certain time elapses after the start operation is started, the ignition mode is changed to a steady time fire mode. In the steady-state ignition mode, the ignition position measurement time for all cylinders is measured, and the ignition circuit for each cylinder is ignited at the position where the measurement of the ignition position measurement time for each cylinder is completed. Give a signal and start Wherein n when until the set time after the start operation of the internal combustion engine is started in the ignition mode has elapsed by the signal generator has generated the signal at a particular location
A first starting ignition mode in which an ignition signal is supplied to an ignition circuit for m specific cylinders, and after a set time elapses after the start operation of the engine is started in the starting time ignition mode, each cylinder is activated. The ignition signal is supplied to the ignition circuit for each cylinder at the position where the measurement of the ignition position measurement time for the cylinder has been completed, and the number of ignition circuits that provide the ignition signal in accordance with the increase in the engine speed is increased stepwise. And an ignition control method for a multi-cylinder internal combustion engine, wherein a second starting ignition mode for finally giving an ignition signal to all cylinder ignition circuits is performed.

(9) When an ignition signal for each cylinder of an internal combustion engine of n cylinders (n is an integer of 3 or more) is given, an ignition circuit for applying a high voltage for ignition to a spark plug of each cylinder is provided for each cylinder. Is provided, a signal generator that rotates in synchronization with the internal combustion engine is provided, and a constant rotation angle position of the engine is detected as a reference position from an output signal of the signal generator, and the signal generator The rotation speed of the engine is detected from the interval of generation of the output signal, and the ignition position of each cylinder at the detected rotation speed is determined every time the rotation speed is detected, and the ignition position of each cylinder determined from the reference position is determined. The time required for the engine to rotate is calculated as the ignition position measurement time for each cylinder,
A multi-cylinder internal combustion engine that starts measuring the ignition position measurement time for each cylinder when the reference position is detected, and generates an ignition signal for each cylinder when the measurement of the ignition position measurement time for each cylinder is completed. An ignition control method for an engine, wherein a specific position at which the signal generator generates a signal is equal to an ignition position at the start of nm specific cylinders (m is an integer of 1 or more and less than n). The opening degree of the throttle valve that regulates the amount of fuel supplied to the internal combustion engine can be detected as the throttle opening degree, and the ignition is performed from the start operation of the internal combustion engine until the start is completed. The ignition mode after the start of the engine and the ignition mode after the start of the engine are set to the ignition mode at the start time and the ignition mode at the steady state, respectively, and the ignition mode is set until the throttle opening reaches a predetermined value after the start operation of the engine. Fire at starting The mode is switched to the steady-state ignition mode after the throttle opening reaches a predetermined value.In the steady-state ignition mode, the ignition position measurement time for all cylinders is measured and the At the position where the measurement of the ignition position measurement time is completed, an ignition signal is given to the ignition circuit for each cylinder, and the signal generator generates a signal until the throttle opening reaches a set value in the starting time ignition mode. At the position, a primary start ignition mode for giving an ignition signal to the ignition circuits for the NM specific cylinders is performed, and after the throttle opening exceeds a set value in the start time ignition mode, the signal generation is performed. At the position where the machine generates a signal, an ignition signal is given to the ignition circuit for the specific cylinder, and the measurement of the ignition position measurement time for the other cylinder is performed. For cylinder Multi-cylinder internal combustion engine ignition control method characterized by causing a second-order starting ignition mode to fire circuit providing an ignition signal.

(10) When an ignition signal for each cylinder of an internal combustion engine of n cylinders (n is an integer of 3 or more) is given, an ignition circuit for applying a high voltage for ignition to a spark plug of each cylinder is provided for each cylinder. Is provided, a signal generator that rotates in synchronization with the internal combustion engine is provided, and a constant rotation angle position of the engine is detected as a reference position from an output signal of the signal generator, and the signal generator The rotation speed of the engine is detected from the interval of generation of the output signal, and the ignition position of each cylinder at the detected rotation speed is determined every time the rotation speed is detected, and the ignition position of each cylinder determined from the reference position is determined. The time required for the engine to rotate is calculated as the ignition position measurement time for each cylinder, and when the reference position is detected, the measurement of the ignition position measurement time for each cylinder is started and the ignition position for each cylinder is calculated. When the measurement of the measurement time is completed A multi-cylinder internal combustion engine ignition control method for generating an ignition signal for each cylinder at a time, wherein the signal generator generates nm signals (m is 1
(I.e., an integer less than n) which is equal to the ignition position at the start of a specific cylinder so that the opening of the throttle valve for adjusting the fuel supply amount to the internal combustion engine can be detected as the throttle opening. The ignition mode between the start of the internal combustion engine and the start of the internal combustion engine and the ignition mode after the start of the engine are completed are referred to as a start-point ignition mode and a steady-state ignition mode, respectively. After the start, the ignition mode is set to a starting point ignition mode until the throttle opening reaches a predetermined value, and the ignition mode is switched to a steady point ignition mode after the throttle opening reaches a predetermined value. In the ignition mode, an ignition signal is given to all cylinder ignition circuits by measuring the ignition position measurement time, and the throttle opening is set in the starting ignition mode. In the meantime, when the signal generator generates a signal at a specific position, a primary start ignition mode for providing an ignition signal to an ignition circuit for the nm specific cylinders is performed, After the throttle opening exceeds the set value in the ignition mode at the starting time, the measurement of the ignition position measurement time for all cylinders is started and the measurement of the ignition position measurement time for each cylinder is completed at each position. Control method for a multi-cylinder internal combustion engine, in which a secondary ignition mode for giving an ignition signal to an ignition circuit for the engine is performed.

(11) When an ignition signal for each cylinder of an internal combustion engine of n cylinders (n is an integer of 3 or more) is given, an ignition circuit for applying a high voltage for ignition to a spark plug of each cylinder is provided for each cylinder. Is provided, a signal generator that rotates in synchronization with the internal combustion engine is provided, and a constant rotation angle position of the engine is detected as a reference position from an output signal of the signal generator, and the signal generator The rotation speed of the engine is detected from the interval of generation of the output signal, and the ignition position of each cylinder at the detected rotation speed is determined every time the rotation speed is detected, and the ignition position of each cylinder determined from the reference position is determined. The time required for the engine to rotate is calculated as the ignition position measurement time for each cylinder, and when the reference position is detected, the measurement of the ignition position measurement time for each cylinder is started and the ignition position for each cylinder is calculated. When the measurement of the measurement time is completed A multi-cylinder internal combustion engine ignition control method for generating an ignition signal for each cylinder at a time, wherein the signal generator generates nm signals (m is 1
(I.e., an integer less than n) which is equal to the ignition position at the start of a specific cylinder so that the opening of the throttle valve for adjusting the fuel supply amount to the internal combustion engine can be detected as the throttle opening. The ignition mode between the start of the internal combustion engine and the start of the internal combustion engine and the ignition mode after the start of the engine are completed are referred to as a start-point ignition mode and a steady-state ignition mode, respectively. After the start, the ignition mode is set to a starting point ignition mode until the throttle opening reaches a predetermined value, and the ignition mode is switched to a steady point ignition mode after the throttle opening reaches a predetermined value. In the ignition mode, the ignition position measurement time for all cylinders is measured, and an ignition signal is given to the ignition circuit for each cylinder at the position where the measurement of the ignition position measurement time for each cylinder is completed. Until the throttle opening reaches the set value in the ignition mode at the time of starting, when the signal generator generates a signal at a specific position, an ignition signal is supplied to the ignition circuits for the nm specific cylinders. A primary start ignition mode is performed, and after the throttle opening exceeds a set value in the start time ignition mode, when the signal generator generates a signal at a specific position, the nm specific number is used. The ignition signal for the cylinder is supplied to the ignition circuit and the measurement of the ignition position measurement time for the other cylinder is performed. The ignition control method for a multi-cylinder internal combustion engine is characterized in that a secondary start ignition mode is performed in which the ignition signals for all the cylinders are finally given an ignition signal.

(12) When an ignition signal for each cylinder of an internal combustion engine of n cylinders (n is an integer of 3 or more) is given, an ignition circuit for applying a high voltage for ignition to a spark plug of each cylinder is provided for each cylinder. Is provided, a signal generator that rotates in synchronization with the internal combustion engine is provided, and a constant rotation angle position of the engine is detected as a reference position from an output signal of the signal generator, and the signal generator The rotation speed of the engine is detected from the interval of generation of the output signal, and the ignition position of each cylinder at the detected rotation speed is determined every time the rotation speed is detected, and the ignition position of each cylinder determined from the reference position is determined. The time required for the engine to rotate is calculated as the ignition position measurement time for each cylinder, and when the reference position is detected, the measurement of the ignition position measurement time for each cylinder is started and the ignition position for each cylinder is calculated. When the measurement of the measurement time is completed A multi-cylinder internal combustion engine ignition control method for generating an ignition signal for each cylinder at a time, wherein the signal generator generates nm signals (m is 1
(I.e., an integer less than n) which is equal to the ignition position at the start of a specific cylinder so that the opening of the throttle valve for adjusting the fuel supply amount to the internal combustion engine can be detected as the throttle opening. The ignition mode between the start of the internal combustion engine and the start of the internal combustion engine and the ignition mode after the start of the engine are completed are referred to as a start-point ignition mode and a steady-state ignition mode, respectively. After the start, the ignition mode is set to a starting point ignition mode until the throttle opening reaches a predetermined value, and the ignition mode is switched to a steady point ignition mode after the throttle opening reaches a predetermined value. In the ignition mode, the ignition position measurement time for all cylinders is measured, and an ignition signal is given to the ignition circuit for each cylinder at the position where the measurement of the ignition position measurement time for each cylinder is completed. Until the throttle opening reaches the set value in the ignition mode at the time of starting, when the signal generator generates a signal at a specific position, an ignition signal is supplied to the ignition circuits for the nm specific cylinders. After the throttle opening exceeds a set value in the ignition mode at the start, the ignition circuit for each cylinder is ignited at the position where the measurement of the ignition position measurement time for each cylinder is completed. The second starting ignition, in which the number of ignition circuits for giving an ignition signal is gradually increased in accordance with an increase in the rotation speed of the engine by giving a signal and the ignition signal is finally given to all cylinder ignition circuits. A multi-cylinder internal combustion engine ignition control method.

(13) A spark plug for each cylinder provided for each cylinder of an n-cylinder (n is an integer of 3 or more) multi-cylinder internal combustion engine and provided with an ignition signal for each cylinder An ignition circuit for n cylinders that applies a high voltage for ignition to the engine, and start of nm (m is an integer of 1 or more and less than n) specific cylinders provided so as to rotate in synchronization with the internal combustion engine. A signal generator for generating a signal at a rotation angle position equal to the ignition position at the time, reference position detection means for detecting a constant rotation angle position of the engine as a reference position from an output signal of the signal generator, and the signal generator Rotation speed detection means for detecting the rotation speed of the engine from the generation interval of the output signal of
Each time the rotational speed is detected, the ignition position of each cylinder at the detected rotational speed is determined, and the time required for the engine to rotate from the reference position to the determined ignition position of each cylinder is determined by the ignition timing for each cylinder. An ignition position calculating means for calculating as a position measurement time, and starting measurement of the ignition position measurement time for each cylinder when the reference position is detected and completing measurement of the ignition position measurement time for each cylinder. An ignition signal generating means for generating an ignition signal for each cylinder, and an ignition circuit for each cylinder at a position where the measurement of the ignition position measurement time for each cylinder is completed by measuring the ignition position measurement time for all cylinders. A steady-state ignition control means for performing a steady-state ignition mode for giving an ignition signal, and a position where the signal generator generates a signal until the rotation speed reaches a set value after the start operation of the internal combustion engine is started. The nm A first starting ignition mode in which an ignition signal is supplied to an ignition circuit for a specific cylinder, and an ignition circuit for a cylinder other than the specific cylinder after an engine speed exceeds a set value lower than a start completion rotation speed. A starting ignition control means for performing a secondary starting ignition mode which also provides an ignition signal; and an ignition mode until the engine rotation speed reaches a start completion rotation speed after the start operation of the internal combustion engine is started. The ignition control device for a multi-cylinder internal combustion engine, further comprising: an ignition mode switching means for switching the ignition mode to the steady-state ignition mode after reaching the start completion rotation speed.

[0074]

As described above, according to the present invention, when the signal generator generates a signal at a specific rotation angle position at the time of starting the engine, the ignition circuit for the n-m cylinder in the n-cylinder ignition circuit is generated. Since the ignition signal is given to the ignition circuit of the above, the ignition is also performed in other cylinders after the rotation is stabilized to a certain extent, so that the ignition position at the start of the start can always be fixed and the start can be reliably performed, and the reverse rotation start And after-fire can be prevented from occurring.

Further, since the ignition signal needs to be supplied only to some of the cylinders at the start of the start, the configuration of the signal generator is simplified as compared with the case where the ignition signals for all the cylinders are obtained from the signal generator at the start. be able to.

In particular, according to the present invention , only the nm specific cylinders are ignited and started in the primary start ignition mode, and then the cylinders whose ignition positions are close to the reference position in the secondary start ignition mode In order to start the ignition degree operation in other cylinders in order from the beginning, the number of ignition circuits for other cylinders giving an ignition signal was increased, so the period in which ignition was performed only in some cylinders There is an advantage that the engine start can be made shorter and the engine can be started smoothly.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a hardware portion according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a configuration of a hardware portion of another embodiment of the present invention.

FIG. 3 is a signal waveform diagram for describing an operation in a starting ignition mode according to the embodiment of the present invention.

FIG. 4 is a signal waveform diagram for explaining an operation in a steady-state ignition mode according to the embodiment of the present invention.

FIG. 5 is a flowchart showing a control algorithm of the embodiment of FIG. 1;

FIG. 6 is a flowchart showing a control algorithm of the embodiment of FIG. 2;

FIG. 7 is an explanatory diagram showing a configuration of a signal generator used in an embodiment of the present invention.

FIG. 8 is a signal waveform diagram for explaining a conventional ignition control method.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Signal generator 3 Rotor 4 Signal generation 11 Waveform shaping circuit 12 Waveform shaping circuit 15 Microcomputer 22 Ignition signal supply circuit U1 to Un

Continuation of the front page (56) References JP-A-3-107570 (JP, A) JP-A-57-59058 (JP, A) JP-A-3-253766 (JP, A) (U, U) Japanese Utility Model 1-66476 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F02P 3/04 302-304 F02D 45/00 362 F02P 5/15

Claims (3)

(57) [Claims] An ignition circuit for applying a high voltage for ignition to an ignition plug of each cylinder when an ignition signal for each cylinder of an internal combustion engine of n cylinders (n is an integer of 3 or more) is given to each cylinder. Provided, a signal generator that rotates in synchronization with the internal combustion engine is provided,
A constant rotation angle position of the engine is detected from the output signal of the signal generator as a reference position, and a rotation speed of the engine is detected from an interval of generation of the output signal of the signal generator, and is detected every time the rotation speed is detected. Calculating the ignition position of each cylinder at the determined rotational speed and calculating the time required for the engine to rotate from the reference position to the determined ignition position of each cylinder as the ignition position measurement time for each cylinder; For a multi-cylinder internal combustion engine that starts measuring the ignition position measurement time for each cylinder when the position is detected and generates an ignition signal for each cylinder when the measurement of the ignition position measurement time for each cylinder is completed In the ignition control method, a specific position at which the signal generator generates a signal is set equal to an ignition position at the time of starting of nm specific cylinders (m is an integer of 1 or more and less than n). Start operation is open Until the rotation speed of the engine reaches the set value from when the signal is generated, when the signal generator generates a signal at a specific position, an ignition signal is given only to the ignition circuits for the nm specific cylinders. A primary start ignition mode is performed, and after the engine speed exceeds a set value, a secondary start ignition mode for providing an ignition signal to an ignition circuit for another cylinder is performed, and the secondary start is performed. In the ignition mode, the ignition position is
Start ignition operation in other cylinders in order from the closest cylinder.
The ignition signal is given every time the rotation speed increases by a predetermined value.
Increase the number of ignition circuits to
An ignition control method for a multi-cylinder internal combustion engine, characterized by providing an ignition signal to a fire circuit . 2. An internal combustion engine having n cylinders (n is an integer of 3 or more).
When the ignition signal for each cylinder is given, the ignition of each cylinder
An ignition circuit that applies high voltage for ignition to the plug is provided for each cylinder.
Provided, a signal generator that rotates in synchronization with the internal combustion engine is provided,
From the output signal of the signal generator, the constant rotational angle position of the engine
Is detected as a reference position, and the rotation speed of the engine is
Degree, and each time the rotational speed is detected, the detected rotational speed
The ignition position of each cylinder is determined and determined from the reference position.
Time required for the engine to rotate to the ignition position of each cylinder
Is calculated as the ignition position measurement time for each cylinder, and when the reference position is detected, the ignition position meter for each cylinder is calculated.
Start measuring the measurement time to determine the ignition position measurement time for each cylinder.
Generate an ignition signal for each cylinder when measurement is completed
In the ignition control method for a multi-cylinder internal combustion engine, the number of specific positions at which the signal generator generates a signal is nm.
(M is an integer of 1 or more and less than n) at the time of starting a specific cylinder
Set to the fire position, and the set time has elapsed since the start operation of the internal combustion engine was started
In the meantime, the signal generator emits a signal at a specific location
When it is generated, the ignition circuit for the aforementioned nm specific cylinders
Only after the start operation is started , the primary start ignition mode for giving only the ignition signal is performed, and after the set time has elapsed, other operations are performed.
-Start ignition that also applies an ignition signal to the ignition circuit of the other cylinder
Mode , the ignition position is set to the reference position in the secondary start ignition mode.
Start ignition operation in other cylinders in order from the closest cylinder.
The ignition circuit gives an ignition signal every time a predetermined time elapses.
Increase the number of roads and finally the ignition circuit for all cylinders
A point for a multi-cylinder internal combustion engine characterized by providing an ignition signal.
Fire control method. 3. An internal combustion engine having n cylinders (n is an integer of 3 or more).
When the ignition signal for each cylinder is given, the ignition of each cylinder
An ignition circuit that applies high voltage for ignition to the plug is provided for each cylinder.
Provided, a signal generator that rotates in synchronization with the internal combustion engine is provided,
From the output signal of the signal generator, the constant rotational angle position of the engine
Is detected as a reference position, and the rotation speed of the engine is
Degree, and each time the rotational speed is detected, the detected rotational speed
The ignition position of each cylinder is determined and determined from the reference position.
Time required for the engine to rotate to the ignition position of each cylinder
Is calculated as the ignition position measurement time for each cylinder, and when the reference position is detected, the ignition position meter for each cylinder is calculated.
Start measuring the measurement time to determine the ignition position measurement time for each cylinder.
Generate an ignition signal for each cylinder when measurement is completed
A throttle valve for adjusting a fuel supply amount to an internal combustion engine in an ignition control method for a multi-cylinder internal combustion engine
Throttle opening that detects the throttle opening as the throttle opening
Detecting means is provided, and the number of specific positions at which the signal generator generates signals is nm.
(M is an integer of 1 or more and less than n) at the time of starting a specific cylinder
The ignition position is set equal to the ignition position, and the throttle opening is
Until the set value is reached, the signal generator
When a signal is generated at the position,
Primary ignition mode that provides an ignition signal to only the ignition circuit of
After the throttle opening reaches the set value.
A second start ignition mode for giving an ignition signal to the fire circuit is performed.
Align, wherein in the second-order starting ignition mode, the ignition position is the reference position
Start ignition operation in other cylinders in order from the closest cylinder.
The ignition signal is applied every time the throttle opening increases by a predetermined amount.
To increase the number of ignition circuits
In a multi-cylinder, characterized by giving an ignition signal to an ignition circuit
An ignition control method for a fuel engine.