JPS6214711B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a signal generator for an internal combustion engine ignition system that supplies a signal for determining the ignition position to an ignition system for igniting a two- or four-cylinder multi-cylinder internal combustion engine.

In general, in internal combustion engines, it is necessary to control the ignition timing according to the engine rotation speed.
In a cycle engine, as shown in Fig. 1, when the rotation speed N (rpm) exceeds the set value N ₃ , the ignition position θ _i changes from θ ₂ to θ as the rotation speed increases.
A lead angle characteristic that allows the lead angle to advance to ₁ is required. In a conventional electronic advance angle device (for example, Japanese Patent Application Laid-Open No. 113733/1989) that obtains such advance angle characteristics, the first and second signals are sent at the maximum advance angle position θ ₁ and the minimum advance angle position θ ₂ , respectively. The first signal that rises at a constant slope from θ ₁ to θ ₂ is generated and uses these signals as a trigger signal.
_{A triangular wave} of The superimposed signal and the second triangular wave signal are compared and the ignition signal that determines the ignition position is generated at the position where both signals match, but when igniting a two-cylinder internal combustion engine using this conventional device In order to achieve this, it was necessary to provide two signal generators for generating the first and second signals, and to arrange the two signal generators at symmetrical positions with an interval of 180° between them. Therefore, it is necessary to provide mounting portions for the signal generators at symmetrical positions on the stator side of the generator, which complicates the structure and wiring, which increases the number of assembly steps and increases the price. In addition, a signal magnetic pole is formed on the outer periphery of the flywheel magnet rotor,
If the signal generator is arranged to face this magnetic pole, the generator cover will bulge at the two locations where the signal generator is installed, making the shape of the cover complicated and making it difficult to manufacture the cover. There was a drawback. Furthermore, if the cover had two bulges, the bulges often made it difficult to attach other equipment.

An object of the present invention is to mount signal generators in one place, and to install two signal generators for different cylinders at 180° intervals.
An object of the present invention is to provide a signal generating device for an internal combustion engine ignition device that can generate two ignition signals.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The signal generating device of the present invention will be explained in detail below with reference to the illustrated embodiments.

Figures 2a to 2c show a generator used in one embodiment of the present invention, and in Figures 2a and 2b, reference numeral 1 is a cup-shaped flywheel made of iron. A boss 2 is fitted into a hole provided in the center of the bottom wall portion 1a of the flywheel 1, and a flange 2a provided at one end of the boss 2 is attached to the bottom wall portion 1a by a rivet (not shown).
is combined with Peripheral wall 1b of flywheel 1
A ring-shaped permanent magnet 3 magnetized to obtain a predetermined number of poles is fixed by adhesive or the like to the inner peripheral surface of the flywheel 1 and the permanent magnet 3 constitute a flywheel magnet rotor. There is. This magnet rotor is attached to an internal combustion engine (not shown) by fitting the boss 2 to the crankshaft of the engine.
Further, an armature (not shown) is disposed on the engine case side so as to face the magnetic poles of the permanent magnet 3.
This armature and the flywheel magnet rotor constitute a magnet generator. The output obtained from the armature of this magnet generator is used not only as an ignition power source to supply ignition energy to the ignition system for internal combustion engines, but also to supply energy to lighting loads such as headlamps, battery charging circuits, etc. . In order to configure a signal generator that generates a signal for determining the maximum advance position and minimum advance position of the internal combustion engine and a signal for distributing the ignition signal, a symmetrical generator located 180° apart on the outer peripheral surface of the peripheral wall of the flywheel 1 is used. Inductors 4, 5 and 4', 5', each consisting of parallel protrusions extending .alpha..degree. in the circumferential direction, are protrudingly provided at the positions.
In this embodiment, these inductors are formed by punching out a part of the peripheral wall 1b of the flywheel toward the outer periphery. Further, a recess 6 is provided on the outer circumferential surface of the flywheel at a position on the side of the inductor 5 and the phase is advanced by β° from the inductor 5, and a permanent magnet magnetized in the radial direction of the flywheel is provided in this recess. 7
are adhered to each other, and the permanent magnet 7 and the peripheral portion of the recess 6 constitute a set of signal rotor magnetic poles.
Note that the attachment of the permanent magnet 7 is not limited to bonding; for example, by fitting a non-magnetic material that presses the magnet 7 into the recess 6 and seaming the periphery of the recess 6, the non-magnetic material can be attached to the magnet. If a structure is adopted in which the permanent magnet 7 is fixed within the recess, the permanent magnet 7 can be mechanically and firmly attached. The case or cover of the engine is provided with a mounting part (not shown) for a signal generator, and this mounting part is provided with a signal generating element that generates 1 per rotation of the flywheel in opposition to a signal magnetic pole consisting of a magnet 7.
a first signal generator 8 that generates a first signal;
A second signal generator 9 that faces the inductors 4, 5 and 4', 5' and generates second and third signals at 180° intervals is disposed close to the outer peripheral surface of the flywheel 1. ing. These signal generators may be separated and provided separately, but in this embodiment, they are molded with resin 10 and integrated as shown by the chain line in the figure. The illustrated first signal generator 8 is shown in FIG.
As shown in the figure, three magnetic poles 11a to 11 are provided at intervals that allow them to face the magnet 7 and the periphery of the recess 6.
This is a well-known type in which signal coils 12, 12 are differentially wound around an iron core 11 having an O-shape or an E-shape and are connected in series. Further, the second signal generator 9 is
Two T-shaped iron cores 1 having one magnetic pole part 13a and arranged side by side in the axial direction of the flywheel.
3, 13, a permanent magnet 14 held between these iron cores 13, 13 and magnetized in the direction in which the iron cores 13, 13 are arranged side by side, and a signal coil 15 wound around the magnetic pole part 13a of one iron core 13. It is made up of.

In the generator described above, when the flywheel 1 rotates in the direction of the arrow P in FIG. Generates a cycle signal once. In this embodiment, the positive half cycle that occurs after this one cycle signal is used as the first signal.
Used as e ₁ ′. Further, the second signal generator 9 is
The second signal e ₂ ′ and the third signal e ₃ ′ (the (see Figure 4 A) occurs twice at 180° intervals. The first signal e ₁ ' and the second signal e ₂ ' have a phase difference of β°, and the second and third signals have a phase difference of α°. Here, the first signal e ₁ ' is used to convert ignition signals generated by a circuit to be described later based on the second and third signals into first and second ignition signals that determine the ignition positions of different cylinders of the engine. This is a signal for ignition signal distribution used for distribution. Further, the second and third signals e ₂ ′ and e ₃ ′ are signals for determining the maximum advance position and minimum advance position of the engine, respectively, and the phase difference α between both signals e ₂ ′ and e ₃ ′ is This is the advance angle width.

FIG. 3 shows the overall configuration of an embodiment of the present invention, and the signal waveforms of the respective parts indicated by symbols A to L in the figure are shown in FIGS. 4 A to L, respectively.
The first signal obtained from the first signal generator 8
The signal e ₁ ' is supplied to the waveform shaping circuit 20 and converted into a pulse-like first signal e ₁ as shown in FIG. 4E. On the other hand, the second and third signals e ₂ ' and e ₃ ' obtained from the second signal generator 9 are supplied to waveform shaping circuits 21 and 22, respectively, and are converted into pulse-like signals as shown in FIG. 4C and D. converted into second and third signals e ₂ and e ₃ . The second signal _e2 and the third signal _e3 are respectively connected to the set terminal S of the flip-flop circuit 23.
and the reset terminal R, and the output of the Q terminal (FIG. 4F) of the flip-flop circuit 23 and the output of the terminal are supplied to the first and second integrators 24 and 25, respectively. The first integrator 24 charges the second integrator, for example by charging a capacitor with a constant current.
An integral operation is performed from the generation position θ ₂ of the signal e ₂ to the generation position θ _{3 of the third signal e 3 to} output a triangular wave signal υ _C1 that rises at a constant slope, and a constant DC bias is applied to the triangular wave signal. A triangular wave signal υ _C1 (see FIG. 4G) on which a voltage υ _b is superimposed and this bias voltage υ _b is superimposed is supplied to the comparator circuit 26 . Further, the second integrator 25 performs an integration operation from the generation position θ _{3 of the third signal e 3 to} the generation position θ ₂ of the second signal e ₂ , and increases at a constant slope from θ ₃ to θ ₂ . A signal υ _C2 having a waveform that maintains the maximum value up to the generation position θ ₃ of the next third signal e ₃ is output.
This signal υ _C2 is supplied to the comparison circuit 26 together with the signal υ _C1 on which the bias voltage E _B is superimposed, and the comparison circuit 26 receives the signal υ _C1 as shown in FIG. 4H.
A rectangular wave ignition signal V _i for determining the ignition position is output at angles θ _i1 and θ _i2 separated by 180° during the period when the ignition position is above _C2 . In this embodiment, the flip-flop circuit 23 and the first and second integrators 24
and 25 and the comparison circuit 26 constitute an ignition signal generation circuit 27. This circuit is already known (Japanese Unexamined Patent Publication No. 54-113733), and when comparing υ _C1 and υ _C2 in which υ _b is superimposed, it is found that the position where both signals match (the rising edge of signal V _i position) θ _i1
and θ _i2 become a function of the engine rotational speed N (rpm), and the ignition position advances as N increases. Therefore, if the ignition operation is performed at θ _i1 or θ _i2 , the characteristics of the ignition position with respect to the rotational speed N will be as shown in FIG.

The ignition signal generating circuit 27 outputs the ignition signal V _i twice per revolution of the engine at 180° intervals. Therefore, in order to ignite each cylinder of a two-cylinder internal combustion engine, it is necessary to distribute the ignition signal V _i as an ignition signal for each cylinder. Therefore, in this embodiment, the third signal _e3 and the first signal _e1 are supplied to the reset terminal R and the set terminal S of the flip-flop circuit 28, respectively, and the outputs of the Q terminal and the terminal of the flip-flop circuit 28 are respectively supplied. It is input to the first and second AND circuits 29 and 30 together with the ignition signal _Vi .

The flip-flop circuit 28 constitutes a signal generation circuit for distributing ignition signals, and its Q terminal has a first signal generation position θ ₁ as shown in FIG. 4I.
The first signal persists from θ to the third signal generation position θ ₃ .
A square wave signal V _S1 is obtained, and the terminal is
As shown in FIG. 2, a second rectangular wave signal V _S2 is obtained that lasts from the third signal generation position θ ₃ to the next first signal generation position θ ₁ .

With the above configuration, the first AND circuit 2
9, the first ignition signal V _i1 is obtained from the second AND circuit 30, and the second ignition signal V _i2 is obtained from the second AND circuit 30. If the internal combustion engine has two cylinders, the first and second ignition signals V _i1 and V _i2 are converted into pulses generated at θ _i1 and θ _i2 , respectively, for example through a differential circuit, and then are used to determine the ignition positions of different cylinders of the internal combustion engine. The specified signal is supplied to the control terminal of the non-contact ignition device.

In the above explanation, a two-cylinder internal combustion engine was used as an example, but even in the case of a four-cylinder internal combustion engine, the present invention can be applied to a four-cylinder internal combustion engine by adopting a simultaneous ignition method in which two cylinders are ignited at the same time: one cylinder that is at the ignition timing and one that is not. can be applied.

In the device of the present invention, the first signal e ₁ ′ does not necessarily have a waveform as shown in FIG. 4B, and as long as it leads the second signal e ₂ ′ in phase,
For example, as shown in FIG. 5, it may occur in multiple cycles or it may contain noise.

In the above embodiment, inductors 4, 5 and 4',
5' is provided on a part of the peripheral wall of the flywheel, but one inductor, for example, the inductors 5 and 5' are omitted and the magnetic pole part 1 of one iron core 13 of the signal generator 9 is used.
3a may always be opposed to the outer peripheral surface of the flywheel.

In the signal generator used in the above embodiment, the second signal generator side was configured as an inductor rotating type, but the second signal generator side was also configured as a magnet rotating type like the first signal generator side. It can also be configured.

The ignition signal generation circuit 27 is a circuit that receives as input the second signal for setting the maximum advance angle position and the third signal for setting the minimum advance angle position and outputs an ignition signal having predetermined advance angle characteristics. Of course, the configuration is not limited to the example described above.

As described above, according to the present invention, the signal generators can be installed in one place, so the configuration can be simplified and the number of man-hours required for installing the signal generators can be reduced. Furthermore, the inconvenience of having two bulges formed on the generator cover is eliminated, and the shape of the cover can be simplified and its manufacture can be facilitated. Furthermore, since the signal for distributing the ignition signal can have a waveform that contains a lot of noise, the signal generator can be manufactured easily and the cost can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an example of the advance angle characteristics required for an engine, and FIGS. Figure c is a front view of the first signal generator used in the generators shown in figures a and b, Figure 3 is a block diagram showing one embodiment of the present invention, and Figures 4A to L are the parts shown in Figure 3. FIG. 5 is a diagram showing a modification of the first signal. 8...First signal generator, 9...Second signal generator, 27...Ignition signal generation circuit, 28...Flip-flop circuit, 29...First AND circuit,
30...Second AND circuit.

Claims (1)

[Claims] 1. An internal combustion engine ignition device that supplies a first ignition signal and a second ignition signal for determining the ignition positions of different cylinders with a phase difference of 180° to an ignition device for an internal combustion engine that ignites a multi-cylinder internal combustion engine. A signal generator for a device includes a first signal generator that generates a first signal for distributing ignition signals once per revolution of the engine, and a signal generator for setting a maximum advance angle position whose phase is delayed from the first signal. and a second signal generator that generates a second signal and a third signal for setting the minimum advance angle position whose phase is delayed from the second signal twice at an interval of 180° per one rotation of the engine. a signal generator; and an ignition signal generation circuit that receives the second signal and the third signal as input and generates an ignition signal with the maximum advance width being an advance angle of the second signal with respect to the third signal. , a first rectangular wave signal that takes the first signal and the third signal as input and continues from a generation position of the first signal to a generation position of the third signal and a generation position of the third signal; a signal generation circuit for ignition signal distribution which outputs a second rectangular wave signal that lasts from 1 to the generation position of the next first signal; a first AND circuit that outputs a signal as the first ignition signal; and a second AND circuit that receives the ignition signal and the second rectangular wave signal as input and outputs the ignition signal as the second ignition signal. A signal generating device for an internal combustion engine ignition device, comprising a circuit.