JPH0214995B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an internal combustion engine ignition device that prevents incorrect power distribution in a multi-cylinder internal combustion engine that does not use a high voltage power distributor.

A conventional device of this type has been disclosed in Japanese Patent Laid-Open No. 56-50263. To briefly explain the operation of the device using the operating waveform diagram shown in Fig. 1, ignition is started based on signal c, which is a time series combination of detection signal a of the first sensor and detection signal b of the second sensor. As the output of the position control circuit, a signal as shown in FIG. 1d is obtained which includes the ignition timings for the two cylinders that match the engine requirements.

This is done according to the output state of the output terminal of the distribution flip-flop shown in FIGS. 1e and 1f.
A signal g for the first cylinder and a signal h for the second cylinder are distributed via a logic gate, and this distributed signal energizes the first and second electronic switching elements,
A primary current as shown in FIG. 1 i flows through the second ignition coil, and a primary current as shown in FIG. 1 j flows through the second ignition coil.

Therefore, a secondary spark as shown in FIG. 1k is generated in the first cylinder at the correct ignition timing required by the first cylinder. The same applies to the second cylinder (Fig. 1l).

In other words, the signal d, which has been serially combined for two cylinders, is distributed to signals g and h for the respective cylinders according to the output state of the distribution flip-flop (Fig. 1e, Fig. 1f). was the gist.

For example, e = "1" (high level meaning,
If it is a period in which the crank position is related to the second cylinder, it is a period in which the crank position is related to the second cylinder, and if it is a period in which e = "0" (meaning low level, the same applies hereinafter), it is a period in which the crank position is related to the first cylinder. It is based on the relationship that it is a period related to.

Therefore, if the output state of the distribution flip-flop (Fig. 1 e, f) does not correspond correctly to the crank position, the ignition signal that should be distributed to the first cylinder will be mistakenly distributed to the second cylinder. Or, conversely, the ignition signal that should have been distributed to the second cylinder was mistakenly distributed to the first cylinder.

A specific example will be explained according to the waveform diagram in FIG.
2a to 2l correspond to FIGS. 1a to 1l. FIG. 2 shows the engine which had been stopped in the latter half of the compression stroke on the first cylinder side, when the key switch was turned on and cranking was started.

The ignition system is activated at the timing of the key switch.
At that time, the output state of the above-mentioned distribution flip-flop (Fig. 2e, Fig. 2f)
is also determined to be either "1" or "0".

This is determined by the electrical characteristics of the ignition system, and since information from the first and second sensors is not available at this point, the distribution flip-flop is determined independently of the actual engine crank position. The output is fixed. Therefore, as in the example in Figure 2,
If the key switch determines that the output state of the distribution flip-flop is e = "1" and f = "0", the predetermined relationship with the actual engine crank position will be broken, so As shown in incorrect power distribution l1, it can be seen that the ignition spark that was supposed to fly in the first cylinder mistakenly flew in the second cylinder.

Considering this spark timing in a 4-cycle engine, it is around the end of the intake stroke of the second cylinder, so the spark generated by this incorrect power distribution l1 causes erroneous ignition, which has an adverse effect on the engine.

This invention was made to eliminate the above-mentioned drawbacks of the conventional art. During a period in which the relationship between the output state of the distribution flip-flop and the crank position of the engine does not satisfy a predetermined condition, the
It is an object of the present invention to provide an internal combustion engine ignition system that does not cause erroneous power distribution by providing a means that does not generate the next output.

Embodiments of the internal combustion engine ignition system of the present invention will be described below with reference to the drawings. FIG. 3 is a circuit diagram showing the configuration of one embodiment. In this FIG. 3, 1 is a sensor that detects the angular position of the first cylinder of the engine;
2 is a sensor that detects the angular position of the second cylinder of the engine.

The output terminal of the sensor 1 is connected via a diode 3 to a first input terminal of a two-input gate 10, and is also connected via a diode 4 to a set input terminal of a distribution flip-flop circuit 9 (hereinafter referred to as FF). Connected to S.

The output end of sensor 1 and the output end of sensor 2 are connected to the reset input end R of ff13 via diodes 5 and 6, respectively.

The output end of sensor 2 is connected to ff9 via diode 7.
is connected to the reset input terminal R of the
It is connected to a second input terminal of a two-input gate 11 via a diode 8 .

These diodes 3 to 8 are appropriately arranged at the respective outputs of the processors 1 and 2, and select positive waves and negative waves of the angular position signals to be detected.

Also, the set input terminal S of ff9 is triggered by the negative wave of sensor 1, and the reset input terminal R of ff9 is triggered by the negative wave of sensor 1.
It is triggered by the negative wave of , and is set and reset alternately.

The output terminal Q of FF9 is connected to the first input terminal of gate 11 with two inputs and the first input terminal of gate 16 with two inputs, and the output terminal of FF9 is connected to the second input terminal of gate 10 and the second input terminal of gate 16 with two inputs. 15 first input terminals, respectively.

The output terminal of the gate 10 is connected to a first input terminal of a two-input gate 12, and the output terminal of the gate 11 is connected to a second input terminal of the gate 12.

The output terminal of gate 12 is the set input terminal S of ff13.
It is connected to the. The output terminal Q of this ff13 is connected to each second input terminal of the gates 15 and 16.

Each output terminal of gates 15 and 16 is connected to transistor 1.
It is connected to each base of 7 and 18. The emitters of transistors 17 and 18 are grounded, and both collectors are connected to the positive terminal of battery 21 via the primary coils of ignition coils 19 and 20, respectively.

The secondary coils of the ignition coils 19, 20 are connected to plugs (not shown). Also Batsuteri 2
The negative electrode of No. 1 is grounded.

The gate 10 functions to pass or block the positive wave from sensor 1 depending on the output state of the output terminal of FF9, and the gate 11 works to pass or block the positive wave from sensor 2 depending on the output state of the output terminal Q of FF9. It operates to either pass or block the passage.

Gate 12 is a gate that temporally serially synthesizes the output signals of gate 10 and gate 11, and ff13
is set by the output signal of this gate 12.

Further, the ff13 is reset by a signal obtained by temporally serially synthesizing the negative wave of the sensor 1 and the negative wave of the sensor 2 via the diodes 5 and 6. Therefore, the ff13 outputs a signal that temporally includes the ignition timings of two cylinders in series.

The gate 15 performs the logical product of the output signal of the output terminal Q of the FF13 and the output signal of the output terminal of the FF9. The gate 16 is a gate that performs an AND operation between the output signal of the output terminal Q of the FF13 and the output signal of the output terminal Q of the FF9.

The transistor 17 is a first electronic switching element that receives the output signal of the gate 15 and is connected to the first ignition coil 19.
The primary current is intermittent.

The transistor 18 is a second switching element, receives the output signal of the gate 16, and connects the second ignition coil 2.
0 primary current is intermittent. Each ignition coil 1
Currents 9 and 20 are supplied from a battery 21.

Next, the operation of the internal combustion engine ignition system of the present invention configured as described above will be explained. Figure 4a
FIGS. 4A to 4P are operation waveform diagrams showing signals of each part in FIG. 3, and will be described with reference to FIGS. 4A to 4P.

As in the case of FIG. 2, this is the case when the crank turns on the engine, which had been stopped in the second half of the compression stroke on the first cylinder side, and starts cranking. At the same time as the key switch is turned on, the ignition system
It is assumed that the initialized ff9 for distribution is determined so that the output of its output terminal Q is "1" (Figure 4 c) and the output of its output terminal is determined to be "0" (Figure 4 d). do.

As cranking begins, the engine rotates,
Eventually, the first output signal is emitted from the sensor 1 (time t ₁ in FIG. 4a).

First, the positive wave of this signal reaches the first input terminal of the gate 10 via the diode 3, but the output signal of the second input terminal of this gate 10, that is, the output terminal of ff9, is "0" at this point. (time domain t ₁ in Figure 4 d), the positive wave from sensor 1 cannot reach the output terminal of gate 10 (time domain t 1 in Figure 4 e).
_t1 ).

The negative wave of this signal passes through diode 4,
A set command is sent to the FF9, but since the distributing FF9 has already been initialized to the set state when the key switch is turned on, the set command becomes an invalid command, and the output of the FF9 does not change at this point (Fig. 4c). , time domain t ₁ in Fig. 4d).

In the next time domain t ₂ , the output from the sensor 2 is emitted (time domain t ₂ in Fig. 4b), and this positive wave passes through the diode 8 and further becomes the output signal at the output terminal Q of ff9. Since this is "1", after passing through gate 11, it passes through gate 12 for serial synthesis and sets ff13 (time domain t ₂ of FIG. 4 c, f, g, i).

With this set command, ff13 sets the output terminal Q to "1".
becomes "0" with the subsequent reset command (fourth
time domain t ₂ in figure i).

This reset command is generated by the negative wave of sensor 2.
is emitted via the diode 6 (time range h in Figure 4).
_t2 ). The signal of output = "1" from the output terminal Q of ff13 reaches gates 15 and 16 and is discriminated.

That is, at this point, since the output of the output terminal Q of ff9 is "1" and the output of the output terminal is "0", it passes only through the gate 16 (Fig. 4l), and the transistor 18 as an electronic switching element is attached. The primary current flows through the ignition coil 20 (Fig. 4, n), and eventually a secondary output is obtained from the ignition coil 20 (Fig. 4, p).
time domain t ₂ ).

In the time domain _t2 , the second detection signal seen from the sensor 1 is emitted (Fig. 4a), but this time, unlike the previous first detection signal, that is, in the time domain _t1 , ff
9 is inverted, a positive wave of the output signal of the sensor 1 appears at the output terminal of the gate 10 via the diode ₃ , as seen in the time domain t3 of FIG. 4e.

This output signal from gate 10 causes ff13 to be set again, and the output at its output terminal Q becomes "1" (time domain _t3 in FIG. 4i). This signal is gate 1
5 and 16, and is discriminated according to the output state of ff9.

That is, at this point, the output of the output terminal Q of ff9 is "0", and the output of the output terminal is "1" (Fig. 4 c, d).
Therefore, only the gate 15 is passed through (time region _{t 3 of} FIG. 4 k, l), the transistor 17 as the first switching element is energized, and the ignition coil 19 is turned on.
A secondary current flows (time domain t ₃ in Fig. 4 m), and eventually, in synchronization with the negative wave of the sensor 1, this primary current is cut off, and a secondary output is emitted from the ignition coil 19 (Fig. 4). time domain t ₃ ) of m, o, and the same operation is repeated thereafter.

That is, in FIG. 2, the ignition spark that erroneously flew to the second cylinder side does not fly to either the first or second cylinder in FIG. 4.
Furthermore, in the time range t1 in Fig. ₄ , where the output state of the distribution ff9 does not satisfy a predetermined relationship with the original crank position of the engine, the configuration is such that no secondary output is generated from the ignition coil. has been done.

In the above embodiment, in order to simplify the explanation, the output signal of the second FF13 is directly used as an on/off signal for the transistors 17 and 18 as electronic switching elements, but it is also possible to add ignition timing control. It is also possible to apply the present invention to an ignition device that has a closed circuit rate (ratio of the on period of an electronic switching element to the ignition cycle) control, and produces the same effects as the above embodiments.

In addition, in the above embodiment, the case where the output of the output terminal Q of the distribution ff is initialized to "1" by the key switch is explained, but in this case, the output of the output terminal Q is initialized to "0". The same effect is obtained even when the output terminal Q is indeterminate whether it becomes "1" or "0" without any intentional initialization.

Furthermore, in the above embodiment, the engine was stopped in the latter half of the compression process of the first cylinder (in the actual compression process,
Since the rotational load torque of the crank increases, the crank often stops at this position.) However, it is of course possible to start from any other position, and this is limited to only when starting. If the distribution FF malfunctions due to some reason such as external noise from ignition sparks during continuous rotation, and the relationship between the distribution FF output state and the engine crank position deviates from the predetermined conditions. has the same effect.

The above embodiment has been explained using a two-cylinder engine as an example, but if a sensor, a diode for separating the positive and negative output signals of the sensor, a distribution flip-flop, and a gate for receiving the output of the distribution flip-flop are added as appropriate, it is possible to create a three-cylinder engine. It is also obvious that it can be applied to engines with more than one cylinder. It goes without saying that the output waveform of the sensor is not limited to the waveform of the above embodiment, but is also effective for square wave type sensors.

As described above, according to the internal combustion engine ignition system of the present invention, during a period in which the relationship between the output state of the distribution flip-flop circuit and the crank position of the engine does not satisfy a predetermined condition, the secondary Since a means for not generating an output is provided, it is possible to obtain a device in which erroneous power distribution does not occur.

[Brief explanation of drawings]

1 and 2 are operation waveform diagrams for explaining the operation of a conventional internal combustion engine ignition device, FIG. 3 is a circuit diagram showing an embodiment of the internal combustion engine ignition device of the present invention, and FIG. 4 is a FIG. 4 is an operation waveform chart for explaining the operation of the internal combustion engine ignition device of FIG. 3; 1, 2...Sensor, 3-8...Diode,
9, 13...Flip-flop circuit, 10-16
...Gate, 17, 18...Transistor, 1
9,20...Ignition coil.

Claims (1)

[Claims] 1. At least two sensors driven by an engine and detecting the crank angle position of the engine;
at least one distribution flip-flop which is alternately set and reset according to the output signal of the sensor; means for serially synthesizing the detection signals of the sensor; and a means for serially synthesizing the detection signals of the sensor; means for distributing signals for predetermined cylinders according to the output state; at least two electronic switching elements that are energized based on the distribution results by this means; and at least two electronic switching elements that are respectively turned on and off by the electronic switching elements. During a period in which the relationship between the ignition coil, the output state of the distribution flip-flop circuit, and the crank position of the engine does not satisfy predetermined conditions, the
An internal combustion engine ignition system comprising means for preventing generation of secondary power. 2. The internal combustion engine ignition system according to claim 1, further comprising at least two gate circuits that pass or block the output of the sensor using the output signal of the flip-flop circuit for distribution.