JPH01224472A - Ignition device of internal combustion engine - Google Patents

Abstract

PURPOSE:To prevent misignition surely by measuring the signaling interval between trigger poles and a guide pole, conducting comparison upon multiplying with a small factor when the angle proportion of the interval is small, and thereby performing cylinder judgement precisely. CONSTITUTION:At the periphery of a signal rotor 1, a plurality of trigger poles 2a, 2b are installed mating with the igniting positions of cyliners. A guide pole 3 is installed ahead one of the trigger poles 2a. A signal coil 4 is installed to generate angle signal mating with the angles of these poles 2a, 2b, and 3. An ignition control device 6 is furnished which is fed with the angle signal from this signal coil 4 through a waveform shaper circut 5. At this time, the ignition control device 6 measures the signaling interval between the poles 2a, 2b, and 3. When the angle proportion of the interval is small, for ex., one of them is multiplied with a small factor to perform comparison, and thereupon cylinder judgement is performed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a non-power distribution type internal combustion engine ignition system that distributes ignition among a plurality of cylinders without using a distributor.

[Conventional technology]

Figure 1 is a block diagram of an internal combustion engine ignition system that was previously filed by the same applicant (Japanese Patent Application No. 142702/1982).
. In the figure, 1 is a signal rotor, and there are 4 rotors on its outer circumference.
Two trigger poles 2a and 2b are provided at an interval of 180° and have angles θ and θ2 of 45°, respectively, corresponding to the two cylinders distributed in the cylinder engine. Reference numeral 3 denotes a cylinder identification guide pole provided in front of the trigger pole 2a, and the angle θ between its front end and the front end of the trigger pole 2a is
3 is placed at a position where angle is 22.5°. 4 is the signal coil, the trigger pole is 2m when the signal rotor rotates once.
, 2b and the guide pole 3,
The output thereof is connected via a waveform shaping circuit 5 to a microcomputer 6 which is an ignition control device.

The microcomputer 6 has an input port door, an input timer 8. Output timer9. CPtJ 10. RAMII.

ROM 12. The output of the waveform shaping circuit 5 is connected to the input port, and the output port 3 is connected to the amplifier circuits 14a and 14b. 15g and 15b are ignition coils whose primary coils are connected to amplifier circuits 14a and 14b, respectively, and a 1-cylinder spark plug 16a is connected to the secondary coil of ignition coil 15a.
and the 4-cylinder spark plug 16b are connected, and the ignition coil 1
A two-cylinder spark plug 16c and a three-cylinder spark plug 16d are connected to the secondary coil 5b.

Next, the operation of the ignition device having the above configuration will be explained using the flowchart of FIG. 3 and the timing chart of FIG. 4.

When the signal rotor 1 rotates in synchronization with the rotation of the engine,
The signal coil 4 has a guide pole 3 as shown in the fourth prisoner.
Positive and negative angle signals are generated corresponding to the trigger poles 2a and 2b. Note that the waveforms in FIGS. 4(8) to (g) show the waveforms at points A to F in FIG. signal coil 4
An angle signal output from the microcomputer 6 is inputted to the microcomputer 6.

The microcomputer 6 determines the period t of this signal in step S1. p (n=1.2.3p...n, n+1..
) is calculated, and in step S2 1. and i multiplied by 1, -
, compare the size with . In this step S2, t, >
If it is s tn-t, the process proceeds to step 83, where s tn-t is the opposite of step S2. is multiplied by i to compare the magnitude. Here, S t, , is t. If it is larger than -1, the process advances to step S4 to perform processing on the 2nd and 3rd cylinder side, and the microcomputer 6 is sent to the microcomputer 6 via its output port 13 as shown in FIG.
2) The signal shown in 2) is sent out. Also, S t,, is t. □,
If it is smaller, the process advances to step S5 and processing on the guide pole side is performed.

If t, , is smaller than gt, , -1 in step S2, i: in step S6. It is determined whether or not is smaller than tn-1 by 9. Here, if S t, ≦t, , -1, proceed to step S7 and perform processing on the 1st and 4th cylinder side, and if T t, > tn-+, proceed to step S
In step 5, process the guide pole side. In the case of processing for the 1st and 4th cylinders, the microcomputer 6 sends out an ignition timing control signal for the 1st and 4th cylinders as shown in FIG. 4 (Q).

The ignition timing control signal for the 1st and 4th cylinders (Fig. 4 (Cl)) and the ignition timing control signal for the 2nd and 3rd cylinders (Fig. 4 (6)) sent from the microcomputer 6 are sent to the amplifier circuit 14a.
, 14b respectively to the ignition coils 15a, 15
b. Then, the ignition coils 15a and 15b are energized as shown in FIG. 4 (6) and (5), respectively, and when the current is cut off, a high voltage is generated in the secondary coil, and the ignition plugs 16a, 16b and 16c, 16d are activated. A spark discharge occurs.

[Problem to be solved by the invention]

The internal combustion engine ignition system configured in this way has achieved great results, such as being able to distribute signals to multiple cylinders using only one signal coil, but Iar! 4. If the rotation speed fluctuation is large, for example when starting the engine, there is a risk of erroneous ignition.
If this kind of misignition occurs, it can cause a fire or a serious problem!
In the case of failure, there were problems such as damage to the engine, and these problems remained unresolved issues.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an internal combustion engine ignition device that can prevent erroneous ignition even when the rotational speed of the engine varies greatly.

[Means to solve the problem]

The internal combustion engine ignition device according to the present invention measures the periods of signals between a plurality of trigger poles and guide poles, and when the angular ratio of these periods is large, one is multiplied by a first coefficient and compared. If the angle ratio is small, multiply one by the first coefficient and the smaller second coefficient and compare.
The cylinder type is determined based on the angle signal.

[For production]

In this invention, since the comparison when the angular ratio of the period is small is performed by multiplying by a small coefficient, there is a high tolerance for engine rotational speed fluctuations for cylinder discrimination, and therefore, large rotational speed fluctuations can be avoided. However, accurate cylinder discrimination is performed.

〔Example〕

DESCRIPTION OF THE PREFERRED EMBODIMENTS An internal combustion engine ignition system according to an embodiment of the present invention will be described below with reference to the drawings. Note that the configuration in the drawings in this embodiment is the same as that in FIG. 1, so the explanation thereof will be omitted here.

FIG. 2 is a flow chart showing the operation of the micro pump 6 in the internal combustion engine ignition system.

First, in step 311, the period t of the signal shown in FIG. 4 (8), (n=1.2.3...n, n+1...
) is determined, and then in step 812 it is determined whether or not the previous cylinder discrimination result was cylinder 2 or 3. Here, if the previous cycle was on the 2°3 cylinder side, the process advances to step 313 and the previous cycle is 2.25 [. Multiply -1 by 1- to set the current cycle to 1. , and if the previous cylinder discrimination result is not on the 2nd or 3rd cylinder side, then in step 514, the previous cycle t, -1 is multiplied by `` and compared with the current cycle t, . Fluctuation,
In particular, when the engine speed suddenly increases when starting the engine, there is a high possibility that incorrect cylinder discrimination will be performed, for example, as shown in Figure 4 (2).
). and period t. This is a case where the angular ratio of the period is small, such as +. Therefore, in this case, by comparing the multiplication coefficient with the second coefficient (1-) which is 2.25 smaller than the first coefficient (T), for example, when starting the engine, the cycle t. Even if the 2°3 cylinder side is ignited at the end of t and the engine speed suddenly increases and the period tn+1 becomes shorter. and t. The comparison with + is accurate.

From the previous cycle t, , -I multiplied by the second or first coefficient in steps 313 and 314, the current cycle 1. , is large, the process proceeds to step 315 and it is determined that it, , > t, , -
1, and if not, in step 316 S
Compare tn≦t, -1. g in step 315
t. >1. -, if the result is step 317, it is determined whether the previous cylinder discrimination result was on the same side as the 1st and 4th cylinders, and if it is on the 1st and 4th cylinder side, then in step 818 the 2nd and 3rd cylinder side Perform processing. Also, T t with Stellap 315
, > t, , -, if the previous time was not on the 1st and 4th cylinder side in step 317, guide pole side processing is performed in step 319. That is, at the stirrup 315, T t,
If it is determined that l>tn-1, the cylinder discrimination is 2,
If the cylinder is on the 3rd cylinder side, and the cylinder discrimination order is normal, the previous cylinder discrimination result should be on the 1st and 4th cylinder side. Therefore, in step 317, it is determined whether or not the cylinder discrimination order is normal by checking whether the previous cylinder was on the 1.4 cylinder side.
If it is not normal, it is determined that the current or previous determination was incorrect, and the guide pole side processing is performed, and the microcomputer 6 does not send out an ignition signal, thus preventing erroneous ignition. Further, if 3t≦1I tn-1 in step 316, the cylinder discrimination is on the 1st and 4th cylinder side, and therefore the process proceeds to step S20 to check whether or not the previous cylinder discrimination result was on the guide pole side. 817
, 318, if the cylinders are discriminated in the normal order, the 1.4 cylinder side processing is performed in step 321. If S t,l≦tn-1 is not determined in step 31B, and if it is determined in step S20 that the order of cylinder discrimination is not normal, the process proceeds to step 319, and guide pole side processing is performed.

Note that in the above embodiment, the first coefficient is i and the second coefficient is 2.25. However, the number is not limited to these values, and the second coefficient is smaller than the first coefficient. Even if other numerical values are used, the same effect as in the above embodiment can be achieved.

〔Effect of the invention〕

As described above, according to the invention of Party B, when the angular ratio of the signal period is small, the comparison is performed by multiplying by a small coefficient. Even in cases where cylinders are detected, cylinder discrimination is performed accurately, erroneous ignition is prevented, and engine failure can be prevented. Further, even when the rotational speed fluctuations are large, misfires are less likely to occur, so the engine starts easily.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an internal combustion engine ignition system according to an embodiment of the present invention and a conventional internal combustion engine ignition system, FIG. 2 is a flowchart showing an operation procedure for cylinder discrimination of an internal combustion engine ignition system according to an embodiment of the present invention, and FIG. 3 4 is a flowchart showing the cylinder discrimination operation of a conventional internal combustion engine ignition system, and FIG. 4 is an operation waveform diagram of each part of the internal combustion engine ignition system according to the present invention and the conventional one. 1...Signal rotor, 2a, 2b...Trigger pole, 3...Guide pole, 4...Signal coil, 6...
・Microcomputer.

Claims (1)

[Claims] A signal rotor that rotates in synchronization with the rotation of the internal combustion engine, multiple trigger poles provided on the outer periphery of this signal rotor corresponding to the ignition position of each cylinder, and a trigger pole located in front of one of these trigger poles. a signal coil that generates an angle signal corresponding to the angle of the trigger pole and the guide pole; measuring the period of the signal between each trigger pole and the guide pole based on the signal from the signal coil; If the angular ratio of these periods is large, one of them is multiplied by the first coefficient and compared,
If the angle ratio of these cycles is small, one of them is multiplied by a second coefficient smaller than the first coefficient and compared, the ignition control device discriminates the cylinder of the angle signal and sends an ignition processing signal for each cylinder. An internal combustion engine ignition device characterized by comprising: