JPH0674779B2 - Internal combustion engine ignition device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-power distribution type internal combustion engine ignition device that performs ignition distribution of a plurality of cylinders without using a distributor.

[Conventional technology]

FIG. 1 is a block diagram of an internal combustion engine ignition device previously filed by the same applicant (Japanese Patent Application No. 62-142702). In the figure, reference numeral 1 is a signal rotor, and two trigger poles 2a and 2b with an interval of 180 ° each have an angle θ ₁ θ ₂ of 45 ° corresponding to two cylinders distributed by a 4-cylinder engine on the outer periphery thereof. It is provided. Reference numeral 3 is a cylinder identification guide pole provided in front of the trigger pole 2a, and is arranged at a position where an angle θ ₃ between the front end of the trigger pole 2a and the front end of the trigger pole 2a is 22.5 °. A signal coil 4 is provided so as to be close to the trigger poles 2a, 2b and the guide pole 3 when the signal rotor 1 rotates, and its output is connected via a waveform shaping circuit 5 to a microcomputer 6 which is an ignition control device. There is. The microcomputer 6 has an input port 7, an input timer 8, an output timer 8, a CPU 10, a RAM 11, a ROM 12, and an output port 13.
The output of the waveform shaping circuit 5 is connected to the input port 7, and the output port 13 is connected to the amplifier circuits 14a and 14b. 15a and 15b are ignition coils whose primary coils are connected to amplifier circuits 14a and 14b, respectively, and the secondary coils of the ignition coil 15a are connected to a 1-cylinder ignition plug 16a and a 4-cylinder ignition plug 16b, respectively. The secondary coil of the coil 15b has a spark plug 16c for two cylinders and a spark plug 16d for three cylinders.
Are connected.

Next, the operation of the ignition device having the above configuration will be described with reference to the flowchart of FIG. 3 and the timing chart of FIG.

When the signal rotor 1 rotates in synchronization with the rotation of the engine,
In the signal coil 4, positive and negative angle signals corresponding to the guide pole 3 and the trigger poles 2a and 2b as shown in FIG. 4 (A) are generated. The waveforms in FIGS. 4 (A) to 4 (F) are the waveforms at points A to F in FIG. The angle signal output from the signal coil 4 is formed into a waveform by the waveform shaping circuit 5 (FIG. 4 (B)) and input to the microcomputer 6.

The microcomputer 6 obtains the period t _n , (n = 1,2,3 ... n, n + 1, ...) Of this signal in step S1, and in step S2
It compares the magnitude of t _n-1 multiplied by the t _n and 3/8. In this step S2 If so, the process proceeds to step S3, which is the reverse of step S2, and t _n
Multiply by and 3/8 to make a size comparison. here, Is greater than t _n−1, the process proceeds to step S4 to perform processing for the 2nd and 3rd cylinders, and the microcomputer 6 sends the signal shown in FIG.
Also If is smaller than t _n-1 , the process proceeds to step S5 and the process on the guide pole side is performed.

Also, in step S2, t _n is If smaller, in step S6 It is determined whether is smaller than t _n-1 . here If it is, proceed to step S7, perform the process of the 1 and 4 cylinder side, If so, the processing on the guide pole side is performed in step S5. The microcomputer 6 is the fourth in the case of processing on the 1,4 cylinder side.
An ignition timing control signal for the 1,4 cylinder side as shown in FIG.

The ignition timing control signals for the 1,4-cylinder side (Fig. 4 (C)) and the ignition timing control signal for the 2,3-cylinder side (Fig. 4 (D)) sent from the microcomputer 6 are amplified by the amplifier circuits 14a, 14b. Is supplied to the ignition coils 15a and 15b via The ignition coils 15a and 15b are shown in FIGS. 4 (E) and 4 (F), respectively.
When the current is cut off, a high voltage is generated in the secondary coil, and spark discharge is performed by the spark plugs 16a, 16b and 16c, 16d.

[Problems to be Solved by the Invention]

The internal combustion engine ignition device configured in this way has achieved great results such as the signal distribution of a plurality of cylinders with only one signal coil. However, when the engine speed fluctuation is large, for example, at engine startup, etc. There is a risk that misfiring will occur, and if such misfiring occurs, there will be problems such as the occurrence of ketchin and, in extreme cases, damage to the engine, and these problems remain unsolved. It was

The present invention has been made to solve the above problems, and an object of the present invention is to provide an internal combustion engine ignition device capable of preventing erroneous ignition even when the engine speed fluctuation is large.

[Means for Solving the Problems]

The internal combustion engine ignition device according to the present invention measures a cycle of a signal between each trigger pole and a guide pole, and determines a cylinder based on a ratio of a cycle measured last time and a cycle measured this time; A determination means for determining whether or not the determination result of this time is correct based on the determination result of the previous time of the determination means, and an ignition control means for performing the ignition process of the cylinder determined this time when the determination result is correct. Is.

[Action]

In the present invention, for example, when the engine speed variation is large and the cylinder discrimination result by comparing the cycles is incorrect, this cylinder discrimination result and the previous cylinder discrimination result are different from the normal order, and therefore No ignition signal is output, and false ignition is prevented.

〔Example〕

An internal combustion engine ignition device according to an embodiment of the present invention will be described below with reference to the drawings. Note that the configuration of the internal combustion engine ignition device in the embodiment in the drawing is the same as that in FIG. 1, and therefore its description is omitted here.

FIG. 2 is a flowchart showing the operation of the microcomputer 6 in the internal combustion engine ignition device. First, at step S11, the period t _n (n = 1, _{n of the} signal shown in FIG.
2,3, ... n, n + 1, ...), and then t _n and 3/8 in step S12
Compared with t _n-1 by multiplying by, If it is, proceed to step S13, If it is, the process proceeds to S14 as in FIG. In this case, steps S11 to S13 correspond to steps S1 to S3, and step S14 corresponds to step S6.

Then in step S13 If it is, the previous cylinder discrimination result is 1,4 in step S15.
It is determined whether or not it is on the cylinder side, and if it is on the 1 or 4 cylinder side, the process proceeds to step S16 to perform the processing on the 2 or 3 cylinder side. Also, in step S13 If it is, the previous cylinder discrimination result is 1,4 in step S15.
If it is not on the cylinder side, the process proceeds to step S17 to perform guide pole side processing, and the microcomputer 6 does not send an ignition signal. That is, if the normal cylinder discrimination order is 2,3
Since the previous cylinder discrimination result of the cylinder discrimination on the cylinder side is always the 1,4 cylinder side, if it is determined in step S13 that this time is the 2,3 cylinder side, if the previous time is not the 1,4 cylinder side. It means that the cylinder discrimination either this time or the previous time is wrong.
Therefore, a sudden rotation fluctuation occurs in the engine, and
Even if a wrong decision is made in S13, false ignition is prevented.

Also, in step S14 If it is determined that, that is, if it is determined to be the 1 and 4 cylinder side, whether the previous cylinder determination result was the guide pole side in step S18 as in the above-described 2 and 3 cylinder side cylinder determination. It is determined whether or not, and only when the previous time is on the guide pole side, the process proceeds to step S19, and the 1,4 cylinder side processing is performed. Therefore, erroneous ignition is prevented even on the 1st and 4th cylinders.

In the above embodiment, the guide pole 3 is replaced with the trigger pole 2a.
It is formed at a position advanced by 22.5 °, and the coefficient for multiplying the cycle t _n by the cylinder discrimination processing of the microcomputer 6 is set to 3/8. This is because the operation of the microcomputer 6 and the discrimination accuracy are taken into consideration. The numerical values are not limited to these numerical values, and other numerical values may be used as long as they are formed positions and coefficients that enable cylinder discrimination.

The concept of setting the above coefficient is shown below. In the above embodiment, the cycle T _n-1 measured last time or the cycle T _n measured this time is multiplied by a coefficient 3/8, and the cycle T _n measured this time is calculated.
Alternatively, it compares the cycle T _n-1 measured last time, which is the ratio of the cycle measured this time to the cycle measured last time T _n / T
It is nothing but comparing the _n-1 with the first predetermined value 8/3 or the second predetermined value 3/8. Tn / Tn _-1 is determined by the physical configuration, and there are only three values, 8/1, 7/8, and 1/7. Therefore, to determine the cylinder, the calculated Tn / T
_It suffices to determine whether _n-1 is 8/1, 7/8, or 1/7. However, in the present application, the angle is converted into the period and Tn / T
_{Since n-1} is calculated, for example, when the engine accelerates or decelerates to cause rotation fluctuations, the value of Tn / Tn _-1 changes accordingly. Therefore, for example, even if an attempt is made to determine the cylinder based on whether Tn / Tn _-1 matches 8/1, it is unlikely that this will match. In the present application therefore, larger Tn / T _n-1 than the first predetermined value 8/3 Tn / T _n-1 is determined to be 8/1, the first predetermined value 8/3 in the same manner 7/8 if it is between the second predetermined value 3/8 and 1/7 if it is smaller than the second predetermined value 3/8
I am trying to determine. Therefore, regarding the first predetermined value, it is sufficient that 8/1> the first predetermined value> 7/8, and it does not have to be 8/3 separately. As described above, the value of Tn / Tn _-1 fluctuates during overdeceleration of the engine, so an actual overdeceleration test was performed to determine the cycle ratio Tn / Tn _-1.
It is more desirable to confirm how much is shifted and to set it so that even if the period ratio Tn / Tn _-1 shifts, it does not exceed the first or second predetermined value.

〔The invention's effect〕

As described above, according to the present invention, after the cylinder discrimination based on the cycle ratio, the previous cylinder discrimination result is collated to check whether the cylinder discrimination is performed in the correct order. Even if the rotation speed suddenly changes, erroneous ignition can be prevented, and thus it is possible to prevent ketching and eventually damage to the engine.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an internal combustion engine ignition device according to an embodiment of the present invention and FIG. 2, FIG. 2 is a flowchart showing a starting procedure for cylinder discrimination of an internal combustion engine ignition device according to an embodiment of the present invention, and FIG. FIG. 4 is a flow chart showing the cylinder discrimination operation of the conventional internal combustion engine ignition device, and FIG. 4 is an operation waveform diagram of each part of the internal combustion engine ignition device according to the present invention and the prior art. 1 ... Signal rotor, 2a, 2b ... Trigger pole, 3 ...
... guide pole, 4 signal coil, 6 microcomputer.

Claims (1)

[Claims] 1. A signal rotor that rotates in synchronism with the rotation of an internal combustion engine, a plurality of trigger poles provided on the outer periphery of the signal rotor in correspondence with the ignition position of each cylinder, and one of these trigger poles. A guide pole arranged in front of the trigger pole, a single signal coil for generating an angle signal corresponding to the angle of the trigger pole and the guide pole, and each trigger pole and guide based on a signal from the signal coil. Measure the period of the signal between the poles,
Cylinder discrimination means for discriminating the cylinder based on the ratio of the cycle measured last time and the cycle measured this time, and discrimination means for judging whether or not the discrimination result of this time is correct based on the discrimination result of the last time of this cylinder discrimination means, An internal combustion engine ignition device comprising: an ignition control unit that performs an ignition process for the cylinder that has been determined this time when the determination unit determines that it is correct.