JPH0328593B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a non-contact ignition device for an internal combustion engine using a magnet generator as a power source, and particularly for a magnet generator type internal combustion engine having a configuration for stopping ignition when the internal combustion engine is reversed. Regarding non-contact ignition devices. In the following description, the internal combustion engine will be abbreviated as engine.

Conventionally, non-contact ignition systems using a magnet generator driven by an engine as a power source generally operate at a fixed ignition angle θ _H at the advance of the engine, as shown in Fig. 2.
and the sensor output voltage signal output by the crank rotation angle sensor at the delayed fixed ignition angle θ _L.
V _H and V _L are used as ignition reference signals, and their voltage signals are provided as input signals to the ignition timing control circuit (shown as block 100 in FIGS. 1, 5, and 7), and are used as the reference signals. The ignition timing control circuit calculates the ignition advance angle and sends the ignition signal as an output signal to the ignition control circuit. The charging action of a discharge capacitor is
Voltage signal generated at delayed fixed ignition angle θ _L
Starts synchronously with V _L. However, normally, when the engine is started, the ignition timing control circuit outputs the ignition signal at the delayed fixed ignition angle _θL .

In the conventional non-contact ignition device for a magnet generator type engine having the above-mentioned configuration, when the engine is reversed at the time of starting, the ignition angle advances to a fixed ignition angle θ, as shown in FIG. 4, for example. Since a voltage signal V _H ′ of the same polarity corresponding to the voltage signal V _L during forward rotation is generated near _H , the ignition timing control circuit operates in response to this voltage signal V _H ′ and outputs an ignition signal. ignition occurs, and the engine continues to rotate in reverse. When such an abnormal operation of the engine occurs, a problem arises in that a so-called "butt-in" phenomenon occurs, and it also has an undesirable adverse effect on members that interlock with the crankshaft of the engine. The present invention has been made with the intention of eliminating the drawbacks of such conventional devices.

In order to prevent reversal that occurs when starting an engine, the present invention provides a magnetic generator coil connected in parallel to the power supply input side of a power supply circuit of an ignition timing control circuit of a non-contact ignition device for a magnet generator type engine. a regulator circuit including a constant voltage control switching element responsive to the application of a voltage of polarity for supplying power to the power supply circuit; and a signal input terminal of the ignition timing control circuit, and transmits the fixed ignition angle signal from the angular position sensor to the ignition timing control circuit in response to a detection signal that detects operation of the constant voltage switching element of the regulator circuit. It is an object of the present invention to provide a non-contact ignition device for a magnet generator type engine, which is equipped with a reverse rotation prevention circuit that controls a reverse rotation prevention circuit.

According to the non-contact ignition device for a magnet generator type engine of the present invention, it is possible to obtain the excellent effect of performing normal ignition timing control when the engine rotates in the normal direction, and reliably and stably preventing the generation of an ignition signal when the engine rotates in the reverse direction. .

Hereinafter, the present invention will be described with reference to several embodiments with reference to the accompanying drawings. The advantages and effects obtained in each embodiment will become clear along with the description of each embodiment.

Referring to FIG. 1, the non-contact ignition device according to the first embodiment of the present invention has a capacitor charging coil 1a and an inductor 1 having a length corresponding to the advance angle width on the outer circumference of the rotor.
The ignition timing control device 4 is composed of a magnet generator 1 provided with a magnet generator 1b, an angular position sensor 2 installed to face the inductor 1b, an ignition timing control device 4, and an ignition coil 3. Ignition timing control circuit 100, reverse rotation prevention circuit 200, and power supply circuit 3
00, a regulator circuit 400, an ignition capacitor 9, and a switching element (hereinafter referred to as SCR) 8 for discharging the charge of rectifier diodes 5, 6, 7 and the ignition capacitor 9. There is.

The ignition timing control circuit 100 is a circuit for realizing the ignition timing characteristics as shown in FIG. 2, but detailed explanation thereof will be omitted. Determining the ignition timing using the output signals V _H and V _L generated by the sensor 2 at the angular positions of advanced and delayed fixed ignition angles θ _H and θ _L , respectively, as reference signals,
It is configured to trigger SCR8.

The power supply circuit 300 is composed of a rectifier diode 31, a capacitor 32, a resistor 33, and a voltage regulator diode 34, and stores electric charge in the capacitor 32 using the negative output voltage of the capacitor charging coil 1a, which does not contribute to charging the ignition capacitor 9. , is configured to be able to supply a constant power supply voltage to the ignition timing control circuit 100.

Regulator circuit 40 in parallel with power supply circuit 300
0 is connected, and the same regulator circuit 400
is a constant voltage diode 10, a resistor 11, a constant voltage control switching element (here SCR) 1
2 and a resistor 13 for detecting the operating state of the SCR12.
Connected between the cathode of 2 and ground.

Also, the angular position sensor 2 and the ignition timing control circuit 1
A reversal prevention circuit 200, which is a feature of the configuration of the device of the present invention, is connected between input terminal A and input terminal A of 00. The reversal prevention circuit 200 includes resistors 14, 15,
16, 17, 21 and PNP transistor 19,
It is composed of an NPN transistor 20 and a diode 18. The anode of the diode 18 is connected to the output terminal of the sensor 2, and its cathode is connected to the input terminal A of the ignition timing control circuit 100.
The emitter-collector circuit of the NPN transistor 20 is connected in antiparallel with the diode 18, and the emitter of the NPN transistor 20 is connected to the anode of the diode 18, and its collector is connected to the cathode of the diode 18. Also, PNP
The base of transistor 19 is grounded, and its collector is connected to NPN transistor 20 through resistor 16.
The emitter of the PNP transistor 19 is connected via the resistor 14 to a terminal A of a resistor 13 connected to the cathode of the SCR 12 of the regulator circuit 400 for detecting the operating state of the SCR 12 of the regulator circuit 400.

The present invention focuses on the fact that the relative angular position at which the output voltage of the capacitor charging coil 1a and the output signal from the sensor 2 are generated differs between normal rotation and reverse rotation, and the Then, the logical product (hereinafter referred to as AND) of the negative direction output signal of the sensor 2, which can serve as an ignition signal at the time of starting, and the output voltage that causes the regulator circuit 400 to operate among the negative direction output voltages of the capacitor charging coil 1a. Take
The angular position at which the output voltage of the capacitor charging coil 1a and the output signal of the sensor 2 are generated is set so that the above AND condition is satisfied during forward rotation, and the above AND condition is not satisfied during reverse rotation. Due to the reverse rotation prevention circuit 200, the negative direction output signal of the sensor 2 is transmitted to the ignition timing control circuit 10 during forward rotation.
It is an object of the present invention to provide a non-contact ignition device having a configuration in which ignition is performed when the signal is input to 0, and the negative direction output signal of the sensor 2 is not input during reverse rotation, thereby preventing ignition.

Hereinafter, the operation of each part of the device of the present invention will be explained with reference to the accompanying drawings.

The positive direction output of the capacitor charging coil 1a of the generator 1 charges the capacitor 9 via the diode 7, the capacitor 9, the primary coil of the ignition coil 3, and the diode 6, and the negative output of the capacitor charging coil 1a The direction output is from the power supply circuit 300
and the diode 5, the capacitor 32 of the power supply circuit 300 is charged, and the ignition timing control circuit 10 is charged.
Supply power to 0. The output of the sensor 2 is sent to the input terminal A of the ignition timing control circuit 100 via the reverse rotation prevention circuit 200.
uses the positive and negative output signals V _H and V _L of sensor 2 as reference signals, and as shown in Fig. 2, the rotation is determined only by the V _L signal from the time of start to the advance start rotation speed N _l . An ignition signal is generated at the angular position, and at rotational speeds above _Nl , an ignition signal is generated for triggering the SCR 8 at the rotational angular position determined by the _VH , _VL signals and the rotational speed. Ignition timing control circuit 1
When triggered by an ignition signal from 00,
The SCR 8 instantly discharges the charge stored in the capacitor 9 through the primary coil of the ignition coil 3, and generates a high voltage across the secondary coil of the ignition coil 3.

FIG. 3 is a time chart for explaining the operation of the non-contact ignition device according to the present invention when the engine rotates in the normal direction, and FIG. 4 shows the operation of the non-contact ignition device when the engine rotates in the reverse direction. In FIGS. 3 and 4, the no-load voltage waveforms generated in the capacitor charging coil 1a during forward and reverse rotation of the engine are output in completely opposite phases to each other, as shown by V _a . In the operating state of the ignition system, the positive and negative outputs of the capacitor charging coil 1a have different circuit loads and a current phase lag, and the output current i has the current waveform i shown in FIGS. 3 and 4. , both forward and reverse rotation,
The angular width of the positive direction output current is θ _A and the angular width of the negative direction output current is θ _B , resulting in waveforms with widely different duty ratios. Due to the negative direction output voltage V _b of the capacitor charging coil 1a, the capacitor 3 of the power supply circuit 300
2 is charged and the terminal voltage rises, and when it reaches a certain level, the regulator circuit 400
Since the SCR 12 is conductive, the negative output of the capacitor charging coil 1a is short-circuited via the resistor 13 so as to bypass the power supply circuit. The voltage across the resistor 13 that detects the operating state of the regulator control element SCR12 is V _c shown in FIGS. 3 and 4. During normal rotation, the capacitor charging coil 1a
Regarding the relative angular positions where the output voltage v _a of the sensor 2 and the output voltage of the sensor 2 are generated _, as shown in _FIG . Positive and negative output voltages V _H and V _L of sensor 2 are generated at the angular position of angle θ _L ,
And within the operating angle range θ _E of the SCR 12 of the regulator circuit 400, the sensor negative direction output voltage V _L
is set up so that it occurs. Reverse prevention circuit 2
The PNP transistor 19 of 00 is in a conductive state because the base current is supplied through the resistor 14 when the SCR 12 of the regulator circuit 400 is operating, and if the sensor negative direction output voltage V _L is generated during this period, the self-output Since the base current is supplied from the collector of the PNP transistor 19 to the NPN transistor 20 via the resistor 16,
The NPN transistor 20 becomes conductive, and the sensor negative direction output voltage signal V _L is applied to the ignition timing control circuit 1.
00 from which an ignition signal can be generated.

However, during reverse rotation, as shown in Figure 4, both the output voltage v _a of the capacitor charging coil 1a and the sensor output voltage were in opposite phase, and during forward rotation, the sensor positive direction output voltage signal V _H was generated at the angular position θ _H. However, during reverse rotation, a sensor negative direction output voltage signal V _H ' is generated at the angular position θ _H. however,
At the angle at which the sensor negative direction output voltage signal V _H ' is generated during reverse rotation, the regulator circuit 400
Since the SCR 12 is not operating and therefore the NPN transistor 20 of the reverse prevention circuit 200 is in a cut-off state, the sensor negative direction output voltage signal
Since V _H ' is not provided to the ignition timing control circuit 100 and therefore the ignition timing control circuit 100 is unable to initiate its control action, no ignition signal is generated.

The relative angular position where the output voltage of the capacitor charging coil 1a and the output voltage of the sensor 2 are generated, as explained in FIGS. This is a case where the angle is set so that the sensor negative direction output voltage V _H ' is generated at _A. Further, the allowable advance angle range for normal ignition during forward rotation is less than θ _C in FIG. 3. However, as in the device of the present invention, the conditions for normal ignition during normal rotation are the angular position of the sensor negative direction output voltage V _H ' and the angular range θ _B of the negative direction output current of the capacitor charging coil 1a.
When taking a logical product with the operating angle range θ _E of the SCR ₁₂ of the regulator circuit 400 _in
This has the advantage that not only can the width be made wider and set with a margin, but also the advance angle width θ _F can be set wider.

In the first embodiment of the present invention described with reference to FIG. 1, as shown in _{FIG .}
, and the case where the negative direction output voltage signal V _L is generated at the delayed fixed ignition angle position θ _L has been described, but the configuration of the device of the present invention is not limited to such a configuration, and as shown in FIG. 6. As described above, even when the polarity of the output voltage signal of the sensor 2 is reversed, the same effect as the first embodiment described above can be obtained by constructing the second embodiment of the present invention shown in FIG. It will be done.
The difference between the configuration of the second embodiment and the configuration of the first embodiment shown in FIG.
0 to the latter PNP transistor 20',
The connection is made by changing the direction of the former diode 18, connecting its cathode to the output terminal of the sensor 2, and its anode to the input terminal A of the ignition timing control circuit 100, so that they are in parallel with the diode 18.
The emitter of PNP transistor 20' is connected to the cathode of diode 18, and its collector is connected to diode 1.
8 and its base is connected to the anode of resistor 1
6 to the collector of the NPN transistor 19'. Further, the emitter of the NPN transistor 19' is grounded, and the base is connected via the resistor 14 to terminal A of the resistor 13 for detecting the operating state of the regulator circuit 400.

The operation of the second embodiment of the present invention having the above configuration is whether the output voltage of the sensor 2 to be controlled is a positive voltage or not.
The only difference is that the voltage is negative, and the rest is the same as the first embodiment.

Furthermore, in the first and second embodiments described above, the reversal prevention circuits 200 and 200' refer to the ignition timing control circuit 10 of the output signal from the sensor 2 in one direction.
The supply path to 0 is controlled to be conducted and cut off when the engine rotates forward and reverse, respectively.
The configuration of the device of the present invention is not limited to this configuration. Now, if the output signal of the polarity sensor 2 shown in FIG. 6 is used, the reverse prevention circuit 200'' is connected to the resistor 14, 15 and 21', NPN
A similar effect can be obtained by controlling the sensor 2 to be configured with a transistor 19' and a reverse voltage protection diode 22, and to supply or bypass the output voltage signal of the sensor 2 to the ignition timing control circuit 100. However, in the case of this third embodiment, the relative angular position where the output voltage of the capacitor charging coil 1a and the output voltage of the sensor 2 are generated is, as shown in FIGS. 8 and 9, during forward rotation. , regulator circuit 400
In the angular region θ _D where the SCR 12 of is not operating,
At the delayed fixed ignition angle position θ _L , a positive direction output voltage signal V _L is generated from sensor 2, and at the time of reverse rotation,
Within the angular range θ _E in which the SCR 12 of the regulator circuit 400 is operating, the advanced fixed ignition angle position θ _H
, the positive direction output voltage signal from sensor 2
It must be set so that V _H ′ occurs.

Furthermore, the device of the present invention limits the number of signal generating devices (for example, the number of sensors, the number of inductors, etc.) and the number of angle signals generated at a predetermined crank angle position in synchronization with engine rotation. isn't it. In addition,
Although the control in the embodiment of the present invention described above has been explained as being aimed at misfiring during reverse rotation, the purpose of the device of the present invention is not limited to this, and the control is intended to prevent unnecessary angle signals (including noise signals). ) is also effective as a means of erasing.

[Brief explanation of the drawing]

FIG. 1 is a schematic electrical circuit diagram of a magnet generator type non-contact ignition device according to a first embodiment of the present invention. FIG. 2 is a characteristic diagram showing the relationship between the ignition advance characteristic of a general magnet generator type non-contact ignition device and the advance and delay fixed ignition angle signals output from the angular position sensor.
FIG. 3 is a diagram of electrical signal waveforms at various parts of the magnetic generator type non-contact ignition system according to the first embodiment of the present invention shown in FIG. 1 when the engine rotates in the normal direction, and FIG. FIG. 3 is an electrical signal waveform diagram of each part. FIG. 5 is a schematic electrical circuit diagram corresponding to FIG. 1 of a second embodiment of the present invention in which the polarities of the leading and delayed fixed ignition angle signals output by the angular position sensor are reversed. FIG. 6 is a characteristic diagram corresponding to FIG. 2 when the polarities of the advance and delayed fixed ignition angle signals output from the angular position sensor are reversed. FIG. 7 is a schematic electrical circuit diagram of a magnet generator type non-contact ignition device according to a third embodiment of the present invention.
FIG. 8 is a diagram of electrical signal waveforms at various parts of the magnet generator type non-contact ignition system according to the third embodiment of the present invention shown in FIG. 7 when the engine is rotating in the normal direction, and FIG. FIG. 3 is an electrical signal waveform diagram of each part. (Explanation of symbols) 1... Magnet generator, 1a... Capacitor charging coil, 1b... Inductor, 2... Angular position sensor, 3... Ignition coil, 4...
...Ignition timing control device, 8... Switching element (SCR), 9... Ignition capacitor, 12... Constant voltage control switching element (SCR) in the regulator circuit, 100... Ignition timing control circuit, 200,
200', 200''...Reverse prevention circuit, 300...
Power supply circuit, 400...Regulator circuit.

Claims (1)

[Claims] 1. A non-contact ignition device for a magnet generator type internal combustion engine, which includes an angular position sensor that detects at least one crank rotational angular position and outputs a fixed ignition angle signal representing the angular position, and an ignition coil. An ignition control circuit that controls intermittent primary current, an ignition timing control circuit that inputs a fixed ignition angle signal from the angular position sensor and outputs an ignition signal for driving the ignition control circuit, and the ignition timing control circuit. The magnet generator includes a power supply circuit that supplies a power supply voltage, and the magnet generator includes a power generation coil, and the output end of the power generation coil supplies the primary current of the ignition coil with a voltage of one polarity of the output AC voltage. , in the non-contact ignition device for a magnet generator type internal combustion engine, which is connected to supply power to the power supply circuit by a voltage of the other polarity, a connection between an output end of the power generation coil and a power supply input end of the power supply circuit; a regulator circuit including a constant voltage control switching element connected in parallel to the power supply circuit at a point and activated in response to application of a voltage of the other polarity of the output AC voltage of the generator coil; and an output of the angular position sensor. the angle of the fixed ignition angle signal in response to a detection signal obtained by detecting the operation of a constant voltage control switching element of the regulator circuit. A non-contact ignition device for a magnet generator type internal combustion engine, which includes a reverse rotation prevention circuit that controls transmission from a position sensor to the ignition timing control circuit. 2. In the device according to claim 1, the reverse rotation prevention circuit is obtained by detecting a fixed ignition angle signal from the angular position sensor and the operation of the constant voltage control switching element of the regulator circuit. A non-contact ignition device for a magnet generator type internal combustion engine, which includes an AND circuit that inputs a detection signal and a detection signal. 3. In the device according to claim 1, the reversal prevention circuit is connected between the signal input terminal of the ignition timing control circuit and ground, and controls the operation of the constant voltage control switching element of the regulator circuit. A non-contact ignition device for a magnet generator type internal combustion engine that includes an opening/closing circuit that operates in response to a detection signal obtained by detection.