JPH0248701Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an improvement in a non-contact type ignition device for an internal combustion engine, and more specifically, to an improvement in a low-voltage distribution ignition device for a multi-cylinder engine.

[Prior art]

Conventionally, there has been a device of this type as shown in FIG. In the figure, reference numeral 1 denotes a rotor that is driven in two directions of arrows by an engine (not shown), and has a protrusion with a predetermined angular width. Reference numerals 3 and 4 denote first and second sensors, which are installed through a protrusion of the rotor 1 and a suitable air gap, and are composed of pick-up coils or permanent magnets, and detect the first to second sensors of the engine according to the rotation of the rotor 1. The fourth angular position detection signal is output as a voltage. Moreover, the first and second sensors 3,
4 is installed with a predetermined phase difference angle (180° in the figure). 5 to 8 are first to fourth diodes;
The anode of the first diode 5 and the cathode of the third diode 7 are connected to the output line of the first sensor 3 so as to discriminate between the positive and negative output voltages generated by the second sensors 3 and 4. The anode of the second diode 6 and the cathode of the fourth diode 8 are connected to the output line of the sensor 4 . Reference numeral 9 denotes a first flip-flop (hereinafter abbreviated as ff), to which the cathode of the first diode 5 of the first set input terminal _S1 is connected, and the second set input terminal S1 is connected to the cathode of the first diode 5.
The cathode of the second diode 6 is connected to _S2 , the anode of the third diode 7 is connected to the first reset input terminal _R1 , and the fourth diode is connected to the second reset input terminal _R2 . Connect the anode of 8. Therefore, if a positive set signal voltage is input to either the set input terminals S ₁ or S ₂ , the Q output terminal becomes "1" (meaning high level), and the reset input terminals R ₁ or R ₂ When either negative reset signal voltage is input, the Q output terminal becomes “0”.
(low level meaning). 10 is the second ff,
The set input terminal S is connected to the anode of the third diode 7, and the reset input terminal R is connected to the anode of the fourth diode 8. Therefore, when a negative set signal voltage is input to the set input terminal S, the Q output terminal becomes "1", and when a negative reset signal voltage is input to the reset input terminal R, the Q output terminal becomes "0". . 11 is the first gate, when the Q output of the first ff9 is “1” and the second
It is connected to output "1" when the Q output of ff10 is "0". 12 is the second gate;
When the Q output of FF9 is "1" and the Q output of the second FF10 is "1", it is connected to output "1".
13 is a first transistor with a grounded emitter, the base of which is connected to the output of the first gate 11;
The collector continues via the primary winding of the first ignition coil 15 and the key switch 17 to the (+) pole of the battery 18 . 14 is a second transistor whose emitter is grounded, its base is connected to the output of the second gate 12, and its collector is connected to the second ignition coil 1.
6 and the key switch 17 to the (+) pole of the battery 18.

FIG. 2 shows the operation of the conventional device with the above configuration, and a
is the output voltage of the first sensor 3, b is the output voltage of the second sensor 4, c to f is the output voltage of the first to fourth diodes 5 to 8, respectively, and g and h are the first and second diodes, respectively. The output voltages of ff9 and 10, i and j are the first
and the output voltage of the second gates 11, 12, k,
l are the first and second ignition coils 15, 16, respectively;
The primary currents m and n indicate the waveforms of the secondary high voltages of the first and second ignition coils 15 and 16, respectively.
When the rotor 1 rotates and the front end of the protrusion passes the first sensor 3, the first sensor 3 receives a positive voltage (the first
angular position detection signal), and the rear end of the protrusion
2, the first sensor 3 emits a negative voltage (second angular position signal) (FIG. 2a).
Furthermore, the rotor 1 continues to rotate and the front end of the protrusion becomes the second
When passing the sensor 4 of the protrusion, a positive voltage (third angular position detection signal) is emitted from the second sensor 4 at a rotation angle of 180 degrees of the rotor 1 from the positive voltage of the first sensor 3. When the edge passes, the second sensor 4 emits a negative voltage (fourth angular position detection signal) (FIG. 2b). The positive and negative periodic voltage outputs emitted from the first sensor 3 are passed through the first diode 5 and the third diode 7 for signal discrimination, and the positive voltage is applied to the first set terminal _S1 of the first FF9. (FIG. 2c), and a negative voltage is applied to the first reset terminal _R1 of the first FF9 and the set terminal S of the second FF10 (FIG. 2e). Similarly, the second sensor 4
A positive voltage is applied to the second set terminal _S2 of the first FF9 (Fig. 2d), and a negative voltage is applied to the second set terminal S2 of the first FF9.
Set terminal _S2 of FF10 and reset terminal R of second FF10
(Fig. 2f). Therefore, the first ff
As shown in Fig. 2g, the Q output of 9 is "1" from the time when the first sensor 3 generates a positive voltage to when the negative voltage is generated, and after the second sensor 4 generates a positive voltage until the second sensor 4 generates a negative voltage. ” becomes. Further, the Q output of the second FF10 rises to "1" with the negative voltage of the first sensor 3, and falls to "0" with the negative voltage of the second sensor 4 (FIG. 2h).
The first gate 11 extracts the signal for only the first cylinder from the signal corresponding to the two cylinders included in the output of g by performing logical processing on each output of g and h in Fig. 2. (Figure 2 i). The second gate 12 similarly takes out the signal for only the second cylinder (FIG. 2j). In this way, the primary current flows through the first ignition coil 15 correctly in synchronization with the output signal timing of the first sensor 3 (Fig. 2k).
An ignition spark is emitted at a predetermined ignition timing (Fig. 2m). The primary current of the second ignition coil 16 and the ignition spark are also operating correctly (Fig. 2l,
n).

In the above conventional device, the first ff9 and the second ff9
In the ideal case, the inversion operation time of FF10 is exactly the same, but in the actual circuit, the sensitivity variation to the input signal between both FF9 and FF10 is due to the operation time from when the input signal is input until the output is inverted. There were variations, etc., and the following problems occurred. For example, at the timing corresponding to time _t2 in FIG. 2, the Q output of the first FF9 changes from "1" to "0" and the Q output of the second FF10 changes from "1" to "0".
FIG. 3 shows a case where the timing of the reversal to "0" is relatively later than the timing. That is, at time t ₂ the second ff10
The Q output h of is inverted from “1” to “0”, but
The Q output g of the first FF9 is inverted from "1" to "0" at a time delayed by 〓 _t from time _t2 . At this time, the output of the second gate 12 changes from the rising timing of the Q output of the first ff9 to the second timing as shown in FIG.
The remaining _t width of the Q output of the first FF9 becomes "1" until the falling timing of the Q output of the first FF9 is outputted from the first gate 11 (Fig. 3 ). Therefore, after time t ₂ 〓 Since the output of the first gate 11 becomes "1" for a period of _t , the first transistor 13 is conductive during that time, and the first ignition coil 1
5, as shown in Fig. 3k, the primary current flows for a very short time, so an output is generated from the secondary side, although it is lower than the normal voltage (part A in Fig. 3m).
The position of this false spark is 180 degrees off from the normal spark position of the first ignition coil 15, and is the end position of the suction stroke in the case of a four-stroke engine.
In other words, since the cylinder is filled with fuel (gasoline, etc.) and the compression process has not yet started, the internal pressure is low, so the required voltage of the engine for ignition is also low, and even an erroneous spark can ignite and cause the engine to malfunction. (backfire, buttock, etc.). As described above, the conventional device described above has the disadvantage that ignition sparks are erroneously emitted at an ignition timing different from the normal ignition timing due to the delay in the operation of FF9 and FF10.

[Summary of the idea]

The present invention has been made to eliminate the above-mentioned drawbacks of the conventional technology, and is configured such that the Q output of the second FF is inverted after the Q output of the first FF completes the inversion operation. However, it is an object of the present invention to provide an internal combustion engine ignition device that does not cause erroneous sparks and is less likely to cause engine malfunction.

[Example of idea]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 4, 21 and 22 are the third and fourth gates, respectively, and the input terminal of the third gate 21 is connected to the anode of the third diode 7 and the first ff9.
The output terminal of the third gate 21 is connected to the set input terminal S of the second ff10. Further, the input terminal of the fourth gate 22 has a fourth
The anode of the diode 8 is connected to the Q output of the first FF9, and the output terminal of the fourth gate 22 is connected to the reset input terminal R of the second FF10.
The output of the third and fourth gates 21 and 22 becomes "0" only when the two input terminals become "0". That is, the second FF10 is set or reset only when the Q output of the first FF9 becomes "0".

FIG. 5 shows an operating waveform diagram around time _t2 . As in the conventional case, the Q output of the first FF9 changes from "1" to "0" with a delay of _t from time _t2 as shown in Fig. 5g.
Consider the case where the voltage falls. The negative voltage of the second sensor 4 is lower than the Q of the first ff9 due to the presence of the fourth gate 22.
While the output is "1", it is blocked by the fourth gate 22 and cannot reach the reset terminal R of the second FF10. Here, when the Q output of the first ff9 becomes "0", the negative voltage of the second sensor 4 is applied to the fourth gate 22.
The second ff10 is reset. Therefore, the Q output voltage of the second FF10 is higher than that after _t has passed from time _t2 , as shown in FIG. At least at a timing that is not too early (at the same time or, strictly speaking, a little later), it is reversed from "1" to "0". Therefore, the first
All “1” of the Q output of ff9 is the second gate 1
2 (FIG. 5j), and no extra output is output from the output of the first gate 11 (FIG. 5i). Therefore, there is no unnecessary primary current flowing through the first ignition coil 15 (FIG. 5k), and no false sparks occur (FIG. 5m, part B).

In the above embodiment, the first and second sensors 3 and 4 are constructed of pickup coils or permanent magnets, but they may also be constructed of an optical type, a Hall element type, or the like. Further, in the above embodiment, the second ff9 waits for the Q output of the first ff9 to be inverted and then
10 so that the set or reset signal is input to the third
and fourth gates 21 and 22 were provided, but the first
The operation delay time of the second FF 10 may be made relatively larger by adding a capacitor, for example, so that the operation delay time of the second FF 10 is longer than the operation delay time of the FF 9. Further, although the first FF9 has two set input terminals and two reset input terminals, the present invention is not limited to this. Furthermore, the output of the first FF9 can be connected to an ignition timing control circuit, a closing rate control circuit, etc. The present invention is also effective when inputting the first and second gates 11 and 12 after transformation.

[Effect of idea]

As described above, in the present invention, the second flip-flop is reversed after the operation of the first flip-flop is completed, and the ignition timing is different from the normal ignition timing due to the delay in the operation of the first flip-flop. Sparks are not caused by mistake, and engine malfunctions can be prevented.

[Brief explanation of the drawing]

Figures 1 to 3 are a circuit diagram of a conventional device, an operating waveform diagram during normal operation, an operating waveform diagram during operation delay, and
FIG. 4 and FIG. 5 are a circuit diagram of the device of the present invention and an operation waveform diagram when the operation is delayed, respectively. 1... Rotor, 3, 4... Sensor, 9, 10...
...Flip-flop, 11, 12, 21, 22...
...gate, 13, 14...transistor. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims for Utility Model Registration] (1) Means for detecting the first to fourth angular positions of the engine, and a first means for sequentially repeating setting and resetting in response to the first to fourth angular position signals. a flip-flop, a second flip-flop that sequentially repeats setting and resetting in response to second and fourth angular position signals, and a first flip-flop that performs logical processing on the output of the first flip-flop and the output of the second flip-flop. and a second gate circuit;
first and second electronic switching elements that intermittent the primary currents of the first and second ignition coils in accordance with the outputs of the first and second gate circuits; The ignition timing of the first ignition coil is the ignition timing of the second ignition coil, and the fourth angular position is the ignition timing of the second ignition coil.
An internal combustion engine ignition system characterized in that the second flip-flop is reversed after the flip-flop has completed its reverse operation. (2) The internal combustion engine ignition system according to claim 1, characterized in that third and fourth gate circuits are provided between the means for detecting the angular position and the input terminal of the second flip-flop. Device.