JPS6282275A - Ignition timing control device for internal combustion engine - Google Patents

Abstract

PURPOSE:To prevent an engine from being reversely rotated by providing No.1 and No.2 pulsers which produce a pair of pulses, the polarity of which is turned over depending on the rotational direction of a crank shaft. CONSTITUTION:A pair of reluctors 13 and 14 are projected out of the circumference of a fly wheel 12 while it is dislocated from both the circumferential and axial directions, and a pair of pulsers 15 and 16, the winding direction of each of which is opposite, for example one is potive and the other is negative in winding direction, is provided so that it faces a pair of the reluctors. While the wheel rotates to the normal direction, when a point where the reluctor 13 ends to pass by, is detected by the pulser 15, a point where the reluctor 14 starts passing by, is detected by the pulser 16. And when the wheel rotates reversely, the circumstance is reverse. And when the wheel rotates to the normal direction, as both of No.2 pulse from the pulser 15 and No.1 pulse from the pulser 16 have a positive polarity and are in phase, the ignition is effected by making a judgment on this principle. On the other hand, when the wheel rotates reversely, as both pulses produced by them have a negative polarity and are in phase, no ignition is effected based on a judgment made on this principle. Thus, this configuration is capable of preventing an engine from being reversely rotated.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an ignition timing control device installed in an internal combustion engine such as an automobile, and particularly to an internal combustion engine designed to prevent reverse rotation of two-stroke and four-stroke internal combustion engines. The present invention relates to an ignition timing control device.

[Prior Art] In ignition timing control devices for internal combustion engines, rotary inductor type signal generators are widely used to obtain ignition timing.

FIG. 12 shows a schematic configuration of a conventional signal generator l. In the figure, 2 is a flywheel that rotates in synchronization with the rotation of the crankshaft, and a magnetized reluctor 3 is protruded from the outer periphery of the flywheel 2. This reluctor 3 passes near a pulser 4. Then, an output signal as shown in FIG. 13 is obtained from the pulser 4, and the ignition timing of the internal combustion engine is determined by this.

[Problems to be Solved by the Invention] Incidentally, in the conventional ignition timing control device described above, the output signal of the signal generator 1 is as shown in FIG.
As shown in b), the rotation direction of the engine was the same during forward rotation and reverse rotation, and could not be electrically distinguished. For this reason,
There was a possibility that the engine would rotate in the opposite direction.

The present invention was made against this background, and an object of the present invention is to provide an ignition timing control device for an internal combustion engine that can prevent reverse rotation.

[Means for Solving the Problems] In order to solve the above problems, the present invention includes first and second pulsers each outputting a pair of pulses whose polarity is reversed depending on the direction of rotation of the crankshaft. Only one of the pulses output from the first pulser and one of the pulses output from the second pulser match in phase, and the phase relationship of each pair of pulses is reversed depending on the rotational direction of the crankshaft. A signal generating means configured as shown in FIG. It is characterized by

[Operation] According to the above configuration, since the polarity of the pulses having the same phase is reversed when the engine rotates forwardly and when the engine rotates reversely, it is possible to easily determine whether the engine is rotating forwardly or reversely. This makes it possible to ignite only when the engine rotates in the normal direction.

[Example code] Hereinafter, the present invention will be described in detail with reference to the drawings.

First, a signal generator used in an embodiment of the present invention will be described with reference to FIGS. 1 to 7.

FIG. 1 shows the configuration of the first signal generator 11. As shown in FIG. In the figure, a pair of reluctors 13 and 14 are provided protruding from the outer periphery of the flywheel 12. These reluctors 13 and 14 are not only offset in the circumferential direction of the flywheel 12 but also in the axial direction of the flywheel 12. A pair of pulsars 15 and 16 are provided opposite the reluctors 13 and 14, and during normal rotation, when the pulsar 15 detects the end point of the reluctor 13, the pulsar 16 detects the start point of the reluctor 14. In the case of reverse rotation, when the pulser 16 detects the passage end point of the reluctor 14, the pulser 15 detects the passage start point of the reluctor 13.

In this case, depending on the winding direction of the pulsar l 5.16 and the rotating direction of the flywheel 12, the pulsar 15.1
6 outputs a pulse signal as shown in FIG.

If the winding direction of mass, pulser 15/16 is forward/reverse, °
, as shown in FIG. 4(a), when the rotation is forward, the second pulse of the pulser I5 and the first pulse of the pulser 16 are both positive polarity and the same phase, and when the rotation is reverse, both of the above pulses are negative polarity. They are in phase with each other.

When the winding direction of pulsar 15/16 is reverse/positive, as shown in Fig. 4(b), when the winding direction is normal, pulsar 1
The second pulse of 5 and the first pulse of pulser 16 both have negative polarity and the same phase, while in the case of reversal, both of the above pulses have positive polarity and the same phase.

Furthermore, when the winding direction of the pulsers 15/16 is reverse/reverse or positive/positive, positive and negative pulses are output in the same phase as shown in FIGS. 4(c) and 4(d).

FIG. 2 shows the configuration of the second signal generator 21.
A reluctor 23 is provided protruding from the outer periphery of the flywheel 12, and a pair of pulsers 25 and 26 detect the passage of the reluctor 23. Here, the width of the reluctor 23 is the same as the distance between the cores of the pair of pulsars 25 and 26, and in normal rotation, when one pulsar 25 detects the end point of passage of the reluctor 23, the width of the other pulsar 25 is reluctor 2
The passage start point of 3 is detected, and when the rotation is reversed, the pulsar 26
When the pulser 25 detects the end point of passage of the reluctor 23, the pulser 25 detects the start point of passage of the reluctor 23.

Therefore, the output waveforms of the pulsers 25 and 26 in this case are also the fourth
It will look like the figure.

FIG. 3 shows the configuration of the third signal generator 31.
A pair of reluctors 33.
34 is provided protrudingly. The reluctors 33.34 are offset in the axial direction of the flywheel 12 and the reluctors 33.3
A line segment connecting the right end and left end of 4 is parallel to the axis of the flywheel 12. Also, reluctor 33.3
4, a pair of pulsers 35, 36 are arranged parallel to the axis, and these pulsers 35, 36 are arranged as shown in FIG.
), they are housed integrally in one casing.

That is, a pulser 35 consisting of a magnet 35a, a core 35b and a winding 35c, and a pulser 36 consisting of a magnet 36a, a core 36b and a winding 36c are fixed to the same stay 37, and constitute two systems of pulsers 35 and 36. . Note that the reason why the cores 35b and 36b are independent is to avoid mixing of the output signals of the pulsers 35 and 36.

The operation of this signal generator 31 is also similar to that of the signal generator 11 shown in FIG. 1, and outputs the signal shown in FIG.
Since the pulsers 5 and 36 are integrated, there is no deviation between the pulsers 35 and 36, and the phases of the output signals can be matched with high precision. Furthermore, since the end faces of the reluctors 33 and 34 are on the same line, accuracy can be improved.

The above method uses the fact that a pair of pulsers continuously detects the reluctor, and the polarity of a set of phase-matched pulses output at the detection conversion point is reversed by forward/reverse rotation of the engine. , which attempts to detect the rotational direction of the engine.

The following describes the types of reluctor detection by pulsers that either start or end at the same time, and the polarity of a set of phase-matched pulses output at the detection start point or detection end point. This method attempts to detect the rotational direction of the engine.

FIG. 5 shows the configuration of the fourth signal generator 41.

In the figure, a pair of reluctors 43 and 44 of different lengths are provided protruding from the outer periphery of the flywheel 12. These reluctors 43 and 44 are provided offset in the axial and circumferential directions of the flywheel 12. Further, pulsers 45 and 46 are disposed opposite to the reluctors 43 and 44, and when the flywheel 12 rotates normally, the reluctors 43 and 44
The passing end point of the reluctors 43 and 44 is simultaneously detected by the pulsars 45 and 46, and when reversing, the passing start point of the reluctors 43 and 44 is detected by the pulsators 45 and 46.
5 and 46 at the same time.

Therefore, the output signals of the pulsers 45 and 46 are as shown in FIG. For example, when the winding directions of the pulsers 45 and 46 are both in the positive direction and the flywheel 12 rotates in the normal direction, the second pulses of the pulsers 45 and 46 have positive polarity and the same phase, and when the winding directions of the pulsers 45 and 46 are reversed, the second pulses of the pulsers 45 and 46 match in phase. The 46 first pulses have negative polarity and are in phase (FIG. 7(a)). Further, when the winding directions are both opposite directions and the flywheel 12 is rotating in the forward direction, the second pulses of the pulsers 45 and 46 have negative polarity and the phases match, and when the winding directions are reversed, the first pulses of the pulsers 45 and 46 are For example, they match in positive polarity, and in other cases, Fig. 7 (
As shown in c) and (d).

Next, FIG. 6 shows the configuration of the fifth signal generator 51. A pair of reluctors 53 and 54 having different lengths are provided on the outer periphery of the flywheel 12 so as to protrude in parallel in the axial direction of the flywheel 12. In this case, the reluctor 53
．． A line segment connecting one end of 54 is parallel to the axis of flywheel 12. These reluctors 53.
Pulsars 55 and 56 similar to the pulsers 35 and 36 shown in FIG. 3 are arranged opposite to each other at 54. During forward rotation, the passage end points of reluctors 53 and 54 are simultaneously detected by pulsers 55 and 56, and during reverse rotation, The starting points of the reluctors 53 and 54 are simultaneously detected. According to such a configuration, the accuracy of phase alignment can be improved as in the case of FIG. 3. Note that the output signal of this signal generator 51 is also as shown in FIG.

FIG. 8 is a circuit diagram showing the configuration of a first embodiment of the present invention, in which the above-described signal generator is applied to a CDI device. In the figure, the output end of a winding 61 of the AC generator is connected to the primary side of an ignition coil 64 via a diode 62 and a capacitor 63. Also,
The anode A of the thyristor 65 is connected to the connection point between the diode 62 and the capacitor 63.
The cathode of No. 5 is grounded.

A diode 66 is connected to the anode side of the diode 62.
A constant voltage power supply 68 is connected through a series circuit including a resistor 67 and a resistor 67 . This constant voltage power supply 68 is made up of a parallel circuit of a constant voltage diode 68a and a capacitor 68b, and supplies a constant voltage to the AND gate 71. At the input end of AND gate 7I, there is a signal generator! ■Pulsa I 5
．． 16 outputs are provided via diodes 72,73. Also, the output of the AND gate 71 is the thyristor 6
It is supplied to gate G of 5. The signal generator 11 is connected to a crank, a camshaft, or a rotating shaft of an ACG, and outputs a pulse signal as shown in FIG. 4(a).

In such a configuration, when the engine rotates, an alternating voltage is generated in the winding 61 of the AC generator, and the diode 6
2 and charges the capacitor 63. At this time,
The pulser 15° 6 of the signal generator 11 outputs a signal as shown in FIG.

In other words, during forward rotation, as shown in FIGS. 15(a) and (b), the phases of the second pulse of the pulser 15 and the first pulse of the pulser 16 match, and both of these pulses have positive polarity. . Therefore, at this time, the AND gate 71 outputs a trigger pulse as shown in FIG. As a result, a high voltage is generated on the secondary side of the ignition coil 64, and ignition is performed.

On the other hand, when the engine reverses, as shown in Figures (d) and (e), the first pulse of pulser 15 and the second pulse of pulser 16 match in phase, and the polarities of these pulses are both negative. be. These pulses are therefore passed through the diode 72 .
73, nothing is outputted from the AND gate 71 (FIG. 7(f)), and the thyristor 65 is not ignited. Therefore, ignition will not occur during reverse rotation.

FIG. 10 is a circuit diagram showing the configuration of a second embodiment of the invention. The signal generator II shown in the figure outputs the pulse signal shown in FIG. 4(b). The outputs of the pulsers I 5, 16 of the signal generator 11 are fed to the input of a NOR gate 83 via transistors 81, 82. Transistors 81 and 82 are NPN type transistors, with their emitters E connected to HULL+15 and 16, and their bases B grounded. In addition, each collector C has a Noah gate 83
It is connected to the input terminal of , and is also connected to the constant voltage power supply 68 via resistors 84 and 85. Furthermore, the cathodes of diodes 86 and 87 are connected to each collector C, and the anodes of these diodes 86 and 87 are grounded.

In such a configuration, when the engine rotates in the forward direction, the pulsators 15 and 16 of the signal generator 11 operate as shown in FIG. 11(a).
As shown in (b), the second pulse of the pulser 15 and the first pulse of the pulser I6 are output in the same phase, and both have negative polarities. At this time, the transistor 81.8
2 are both turned on, and the input to the NOR gate 83 is the ti-th
As shown in Figures (c) and (d), the NOR gate 83 outputs the "H" level signal shown in Figure (e).
Thyristor 65 is turned on. In this way, when rotating forward,
Parsa! Ignition occurs when the phases of output pulses 5 and 16 match.

On the other hand, when the engine is reversed, pulsar 15. 1st from +6
The pulse signal shown in Figure 1 (D, (g)) is output. That is, the first pulse of the pulser 15 and the second pulse of the pulser 16 match in phase, and both of these pulses have positive polarity. At this time, , transistors 81 and 82 are both turned off (see (h) in the same figure).

(i)), nothing is output from the NOR gate 83 ((j) in the figure). Therefore, during reverse rotation, the thyristor 65 is not fired and the engine is not ignited.

In addition, in each of the above embodiments, the signal generator 11 was used as the signal generator, but the signal generator 21 was used instead.
, 31, 41.51 chairs can be used. In this case, depending on the polarity of the output signal of the signal generator, the first embodiment, the second embodiment, or a circuit in which an inverter is added to these may be used.

Further, the above signal generator is not limited to the C11l device, but can also be used for DC
- It can be similarly applied to devices such as CD I and full transnosta.

Effects of the Invention] As explained above, the present invention detects the rotational direction of the engine using a pair of signal generators in which the phase relationship and polarity of the output signals are both reversed as the engine rotates.
Since the ignition is made to ignite only when the engine is rotating in the forward direction, it is possible to prevent the engine from reversing. As a result, the wall thickness of the internal combustion engine can be reduced, and the internal combustion engine can be made smaller in diameter.

[Brief explanation of drawings]

1 to 3 are diagrams showing the external configuration of the signal generating means according to the embodiment of the present invention, and (A) and (B') in each figure are A-, A-line, and +3 of (C), respectively. 4 is a waveform diagram showing the pulse waveform output from the signal generating means, and FIGS. 5 and 6 are views showing the external configuration of other signal generating means according to the embodiment of the present invention. In the figures shown, (A) of each figure,
(B) is the A-A line and B-B line arrow view of (C), respectively.
FIG. 7 is a waveform diagram showing the pulse waveform output from the signal generating means, FIG. 8 is a block diagram showing the configuration of the ignition time control device according to the first embodiment of the present invention, and FIG. 9 is the same ignition timing control device. FIG. 10 is a block diagram showing the configuration of an ignition timing control device according to a second embodiment of the present invention, and FIG. 11 is a waveform diagram for explaining the operation of the ignition timing control device according to a second embodiment of the present invention. 12 is a schematic diagram showing the configuration of a conventional signal generating means, and FIG. 13 is a waveform diagram showing a pulse waveform output from the signal generating means. + 1.21.31.41 .51...Signal generator, 13°+4.23.33, 34.43, 41, 53
．． 54 - Reluctor, +5.16, 25.26.3
5, 36, 45° 46.55.56...Pulsa, 6
4...Ignition coil (ignition means), 71...
... Ant Gate, 83 ... Noah Gate (71 above)
．． 83 is a determining means). shi-1111'' Figure 3, 4, correct Mudan, figure 5, figure 6, square, figure 7, reverse, eaves one sea] - figure 9, correct ヰ? , difference
Figure 11: Forward rotation (e) - 111 old - (J) □ Figure 10

Claims (1)

[Claims] In an ignition timing control device for an internal combustion engine whose ignition signal is an output signal of a rotating inductor type signal generating means that rotates in synchronization with the crankshaft, each pair of pulses whose polarity is reversed depending on the direction of rotation of the crankshaft is output. has first and second pulsers, one of the pulses output from the first pulser and one of the pulses output from the second pulser match in phase, and the rotation direction of the crankshaft a signal generating means configured to reverse the phase relationship of each pair of pulses, and a determining means for determining the rotational direction of the crankshaft from the pair of pulses having the same phase;
An ignition timing control device for an internal combustion engine, comprising an ignition means that performs ignition only when the crankshaft rotates in the normal direction.