JPH0531677B2 - - Google Patents

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a magnet generator type non-contact ignition device, and in particular to an electronic advance angle with step advance angle having a configuration for stopping ignition when an internal combustion engine is reversed. This relates to improvements in magnets.

[Background of the invention]

Conventionally, when the internal combustion engine is reversed when starting, the ignition signal is output and ignition is performed, and the reversal continues to occur, or a butt phenomenon occurs, which is preferable for members that operate in conjunction with the engine crankshaft. Therefore, it is desirable not to perform the ignition operation during reverse rotation.

[Object of the present invention] The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to stop the ignition operation when the internal combustion engine rotates in reverse, and to obtain ignition timing characteristics with step advance angle using one sensor during forward rotation. The object of the present invention is to provide a magnet generator type non-contact ignition device that can perform the following steps.

[Configuration of the present invention]

The magnet generator type non-contact ignition device according to the present invention includes:
A magnet generator with two protrusions on the outer circumference of the rotor and a rest part for part of the alternating voltage generated in the capacitor charging coil, one sensor that generates two lines of alternating voltage per rotation, and a capacitor discharger. When a signal voltage of one polarity is introduced into the ignition circuit and the sensor, an output is issued to the ignition circuit, and when a signal voltage of another polarity is introduced, advance angle calculation is performed and the result is sent to the ignition circuit. an ignition timing calculation circuit that outputs, a first layered circuit that is conductive in one polarity of the capacitor charging coil, a second layered circuit that is conductive for a predetermined period of time according to a signal voltage of one polarity of the signal coil; It is comprised of a step rotation speed detection circuit that detects the rotation speed by introducing signals corresponding to rotation and reverse rotation.

〔Example〕

The present invention will be described below with reference to embodiments shown in the figures. FIG. 1 is an electric circuit diagram showing the configuration of an embodiment of a magnet generator type non-contact ignition device according to the present invention.
1 is a capacitor charging coil, 2 is a diode, 3
is an ignition capacitor, 4 and 5 are the primary and secondary coils of the ignition coil IG, 6 is a thyristor,
7 is a diode, and the above-mentioned components constitute a capacitor discharge type ignition circuit. 8 is a diode, 9 is a power supply capacitor for an ignition timing calculation circuit to be described later, 10, 11, and 12 are a regulator thyristor and a resistor Zener diode, respectively.
The power supply circuit R is constituted by the above reference numerals 8 to 12. 13, 14, 15, 16, and 17 are resistors, diodes, resistors, resistors, and transistors that detect the negative voltage of the charging coil 1, respectively;
Reference numerals 18, 19, and 20 are transistors and resistors that become conductive when the charging coil 1 has a negative voltage, and the components 15 to 20 constitute the first layered circuit L. 21 is a signal coil of a timing sensor, and 22, 23, and 49 are diodes. 24, 25, 26, 27, 28 and 29,
30 is a resistor that creates a reference voltage for the comparators 31 and 32, respectively; 33 is an R-S flip-flop; 34 is an analog switch that becomes conductive when the Q output of the flip-flop 33 becomes "1";
35 and 36 are constant current circuits, 37 is a calculation capacitor, 38 is an analog switch for resetting the charge on the capacitor 37 (making it zero), 39, 4
0 is a resistor that creates the reference voltage of the comparator 41, 4
2 and 44 are AND circuits, 43 is an OR circuit, and 45 is a set circuit, and the components 24 to 45 constitute an ignition timing calculation circuit G. 47 and 48 are diodes, and 46 is a resistance between the gate and cathode of the thyristor 6. 55,5
6 is a transistor, 50, 51, 52, 57, 5
8 is a resistor, 54 is a timer capacitor, 53 is a Zener diode, and the components 50 to 58 constitute a second layered circuit T. 60, 61, 62, 63, 64, 68,
69, 71, 72, 73 are resistances, 65, 66, 7
0 and 74 are transistors, 67 is a timer capacitor, and the components 60 to 74 constitute a step rotation speed detection circuit M. Note that 75 is a spark plug.

FIG. 2 is a schematic diagram showing the structure of the magneto in the magneto generator type non-contact ignition device according to the present invention.
00 has two sensor protrusions 101 and 10 on the outer periphery.
Magnet 1 with partially irregular magnetic pole arrangement on the inside
03, 200 is a sensor incorporating the signal coil 21, and 300 is a stator including the capacitor charging coil 1 and other output coils. FIG. 3 is a characteristic diagram showing the ignition timing pattern in the device of the present invention. Fourth
The figure shows a voltage waveform diagram of each part of the device of the present invention when the internal combustion engine rotates in the normal direction, and FIG. 6 are diagrams showing the phase relationship between the output of the capacitor charging coil 1 and the output of the sensor 200 of the device of the present invention when the internal combustion engine is reversed. In FIGS. 4 to 6, a represents the capacitor charging. No-load voltage waveform diagram of coil 1, b is voltage waveform diagram of signal coil 21, c
is an output waveform diagram of the comparator 32, d is an output waveform diagram of the comparator 31, and e is a diagram of the flip-flop 3.
3's Q output waveform diagram, f is the voltage wave diagram of the calculation capacitor 37, g is the voltage waveform diagram of the ignition capacitor 3, h is the voltage waveform diagram of the timer capacitor 54, and i is the transistor of the second layered circuit T. A diagram showing the conduction period of 55, j is the ignition timing calculation circuit G.
An output waveform diagram of the AND circuit 44, k is a voltage waveform diagram of the timer capacitor 67, l is a diagram showing the conduction period of the transistor 70 of the step rotation speed detection circuit M, and m is a diagram showing the negative direction output of the capacitor charging coil 1. 3 is a voltage waveform diagram across the resistor 13. FIG.

Next, the operation of the magnetic generator type non-contact ignition device of the present invention having the above structure will be explained. In the magneto shown in FIG. 2, the arrangement of the 12 magnetic poles of the rotor 100 is partially irregular, and the stator 300 has 12 poles. Therefore, when the rotor 100 rotates once, the capacitor charging coil 1 of the stator has the magnetic poles as shown in FIG. The signal coil 21 of the timing sensor 200 generates an output voltage with a partial pause as shown in Fig. 4b.
Two systems of voltage shown in are generated. Then, the phase of the voltage of the charging coil 1 and the voltage of the signal coil is determined by the signal voltage of the first system in the output rest part of the charging coil 1.
S ₁ and S ₂ enter, and the second system signal voltages S ₃ and S ₄ (especially voltage S ₄ ) are included in the negative polarity of the charging coil 1 voltage.
Each part is arranged so that it fits.
The positive direction output of the capacitor charging coil 1 causes a current to flow through the diode 2, the capacitor 3, the primary coil 4 of the ignition coil IG, and the diode 7, charging the ignition capacitor 3 and obtaining a power source for ignition.
In addition, the negative direction voltage is passed through the diode 8, capacitor 9, resistor 13, and diode 14 to charge the power supply capacitor 9 and power the ignition timing calculation circuit G to each IC and other circuits. (The Zener diode 12, the resistor 11, and the thyristor 10 are a regulator circuit for the power supply capacitor 9.) At the same time, the output in the negative direction is connected to the power supply circuit R, resistors 16 and 15, and diode 14.
A current is caused to flow through the transistor 17 to make the transistor 17 conductive. On the other hand, the voltage shown in FIG. 4b is generated in the signal coil 21 of the timing sensor 200.
The resistors ₂₇ , 28, ₂₄ ,
Each value of 26 and 25 is determined. Further, if the transistors 56 and 74 conduct, the ignition thyristor 6 is made conductive via the transistors 56 and 74, the resistor 73, and the diode 48, and the plug 75
ignite. The respective resistance values of the negative direction outputs S ₂ and S ₄ are set so as to charge the timer capacitor 54 . The voltage of the charged capacitor 54 is discharged at a constant value determined by the resistors 52 and 51 as shown in FIG.
conducts, thereby enabling the transistor 56 to conduct (turn on). When the capacitor charging coil 1 outputs in the negative direction, the transistor 17 is conductive as described above, so the negative output S ₄ of the signal coil 21 that occurs when the charging coil 1 outputs in the negative direction is connected to the transistor 1.
9, the negative terminal (-) of the comparator 32 is pulled in the negative direction. At this time, this comparator 32
resistor 2 so that “1” is output (Fig. 4c)
The values of 9 and 30 are determined, and when "1" is output, the set circuit 45 is set, the flip-flop 33 is reset, the analog switch 38 is closed via the OR circuit 43, and the calculation capacitor 37 is reset. AND circuit 44 and diode 4
The thyristor 6 is made conductive through the thyristor 7, and the plug 75 is ignited. Also, “1” is output from the AND circuit 44.
When is output, the transistors 65 and 66 of the step rotation speed detection circuit M become conductive, and the respective resistance values are set so that the timer capacitor 67 is charged. The voltage of the charged capacitor 67 is the voltage of the resistor 6
8 and 69 as shown in FIG. 4, the transistor 70 is made conductive for a predetermined period of time, and the transistor 74 is made conductive (turned on).

Next, the operation at a low speed (at the time of starting the internal combustion engine) at a rotational speed less than _N2 (at _N1 rotation) shown in FIG. 3 will be described. When the rotor 100 rotates, a voltage shown in FIG. 4a is generated in the capacitor charging coil 1, and the charging coil 1 charges the ignition capacitor 3 in a stepwise manner as shown in FIG. 4g with a positive output. The charging capacitor 9 is charged by the negative direction output, and the calculation capacitor 37 is charged with a constant current via the constant current circuit 36 as shown in FIG. 4f. Next, a positive voltage _S1 is generated in the signal coil 21, and the comparator 31
"1" is output from the flip-flop 33, the Q output of the flip-flop 33 is set to "1", and the analog switch 3
4 is closed, the calculation capacitor 37 starts constant current discharge via the constant current circuit 35 and switch 34 as shown by the solid line in FIG. 4f. On the other hand, while the negative voltage S ₂ is not generated in the signal coil 21, the transistor 55 is not yet conductive. When the rotor 100 further rotates and the voltage S ₂ is generated in the signal coil 21, the Charge the timer capacitor 54. The charged charges are discharged by the resistors 52 and 51 as shown by the solid line in FIG. 4h, making the transistor 55 conductive for a certain period of time as shown in FIG. 4i, and making the transistor 56 conductive. As a result, the voltage _S1 generated in the signal coil ₂₁ before the signal S2 is not supplied to the step rotation speed detection circuit M. In addition, since it is an output suspension part of the charging coil 1, the transistor 1 of the first layered circuit L
7 and 19 are cut off, the voltage S ₂ is not output to the comparator 32 either. Next, when a positive signal voltage _S3 is generated, this voltage _S3 is input to the step rotation speed detection circuit M since the transistor 56 of the second layered circuit T is already in a conductive state. It is also input to the positive terminal of the comparator 31 and an output "1" is output as shown in FIG. Finally, as shown in Figure 4b, the negative signal voltage _S4 is applied to the signal coil 2.
1, the timer capacitor 54 is charged by the same operation as the voltage _S2 described above. At the same time, since the transistor 17 of the first layered circuit L is conductive due to the negative output of the capacitor charging coil 1, the transistor 19 is also conductive, and the comparator 3
The negative terminal of 2 is pulled by the signal voltage S ₄ and outputs "1". When the comparator 32 outputs "1" (FIG. 4c), it sets the set circuit 45 and resets the flip-flop 33. At the same time, it is output to the gate of the thyristor 6 via the AND circuit 44 and the diode 47, making the thyristor 6 conductive. and ignites the plug 75. Note that the output of the OR circuit 43 is applied to the analog switch 38, and when this switch 38 is closed, the calculation capacitor 37 is
is instantly discharged and reset (fourth
Figure f). The output signal of the AND circuit 44 is also supplied to the step rotation speed detection circuit M, and this signal causes transistors 65 and 66 to conduct, thereby charging the timer capacitor 67. The charged charges are discharged by the resistors 68 and 69 as shown by the solid line in FIG. 4k, making the transistor 70 conductive for a certain period of time as shown in FIG. 4l, and making the transistor 74 conductive. However, since the signal voltage S ₃ is not generated during the conduction period of the transistor 70 (FIG. 4l) at less than N ₂ rotations (N ₁ rotation), this voltage S ₃ is not input to the thyristor 6. N ₂ shown in Figure 3
Below the rotation, the above operation is repeated and the signal voltage S ₄
The ignition timing θ _L2 determined by the generator is obtained.

When the number of rotations reaches _N2 , the discharge time of the timer capacitor 67 in the step rotation speed detection circuit M becomes relatively long as shown by the broken line in FIG. ₃ occurs, the signal voltage S ₃ is connected to the diode 4
The thyristor 6 is made conductive via the thyristor 8 and ignited.
Therefore, at the rotational speed _N2 shown in FIG. 3, a step occurs in the ignition timing θ _H2 determined by the generation position of the signal voltage _S3 . Furthermore, at the rotation speed _N2 , the signal voltage _S4 is generated next, and an output "1" is output from the comparator 32 as shown in FIG. Since there is no ignition, the flip-flop 33 and calculation capacitor 37 are reset. As described above, in _N2 rotations, the ignition timing steps from θ _L2 to θ _H2 , and ignition by signal voltage S ₃ is repeated until _N3 rotations.

As the rotation of the rotor 100 increases, the time for charging the calculation capacitor 37 of the ignition timing calculation circuit G becomes shorter, so the voltage of this capacitor 37 gradually decreases, and when the rotation exceeds N ₂ ', the calculation capacitor 37 The voltage during constant current discharge is shown in Figure 4 f.
The reference voltage V _TH1 was reached (decreased) as shown _{in FIG .} At this point, an output "1" is generated in the comparator 41, and the thyristor 6 is made conductive via the AND circuit 42, the OR circuit 43, the AND circuit 44, and the diode 47, and an ignition operation is performed. This operation is repeated until N ₅ rotations,
Since constant current charging, constant current discharging, and constant voltage detection are performed, the calculation capacitor 3 is
7. As the charging time becomes shorter and the voltage at the start of discharge becomes lower, the ignition timing advances linearly. Therefore, from N ₃ rotations to N ₅ rotations, the ignition timing advances in a straight line as shown in Figure 3. A typical lead angle characteristic can be obtained.

When _N5 rotations are reached, the charging voltage of the calculation capacitor 37 changes to the reference voltage of the comparator 41 when the signal voltage _S1 is generated as shown by the two-dot chain line in FIG.
Since the voltage reaches V _TH1 , an output "1" is generated from this comparator 41. When the signal voltage S ₁ is applied to the comparator 31 from the signal coil 21, the thyristor 6 is made conductive through the Q terminal of the flip-flop 33, the AND circuit 42, the OR circuit 43, the AND circuit 44, and the diode 47, and is ignited. The positive signal voltage S ₃ and the negative signal voltage S ₄ also cause the thyristor 6 to conduct, but since the capacitor 3 has no charge, it does not ignite. Further, the ignition timing calculation circuit G is reset by the negative signal voltage _S4 , and the ignition operation by the signal voltage _S1 is repeated (the voltage _S2 makes the second stratified circuit T conductive for a predetermined period). When _N5 rotations are exceeded, when signal voltage _S1 occurs, capacitor 37
Since the charging voltage of comparator 41 is lowered by the reference voltage of comparator 41, comparator 3 due to this voltage _S1
Based on the output of 1, the salista 6 is made conductive and ignited.

To summarize the above operation during normal rotation, below N ₂ rotations, the ignition timing θ _L2 is fixed, determined by the position where the negative signal voltage S ₄ is generated, and at N ₂ rotations, the step rotation speed detection circuit M conducts, so that the voltage S ₄ Positive signal voltage S from ₃
Stepping to ignition timing θ _H2 , from N ₂ rotations to N ₃
For rotation, fixed ignition timing θ _H2 by voltage S ₃ , from N ₃ rotations to N ₅ rotations, linear advance angle by calculation circuit G,
At _N5 rotations or more, a characteristic can be obtained in which the ignition timing θ _H1 is fixed, which is determined by the position where the signal voltage S ₁ is generated.

Next, the operation during reverse rotation of the internal combustion engine will be explained. During normal rotation, the output of the capacitor charging coil 1 and the output of the signal coil 21 are set so as to be obtained as shown in FIG. At the time of reverse rotation, as shown in FIG. 6, the polarity of the output voltage of the signal coil 21 generated at approximately θ _H1 , θ _L1 , θ _H2 , and θ _L2 is reversed, and S ₁ ',
S ₂ ′, S ₃ ′, and S ₄ ′. Further, the output of the charging coil 1 is similarly inverted. With such a phase relationship, in the first layered circuit L, when the charging coil 1 generates a negative direction output, the negative polarity signal voltage of the signal coil 21
Both S ₁ ′ and S ₃ ′ do not match in phase, and the comparator 32
The output of remains in the "0" state. Therefore, the set circuit 45 is not set and its output Q is "0".
Therefore, no signal is supplied from the AND circuit 44 to the thyristor 6, and no ignition occurs. In the second layered circuit T, the timer capacitor 54 is charged by the negative signal voltage S ₃ ' of the signal coil 21, the transistor 55 becomes conductive, and the signal voltage S ₂ ' is passed through the transistor 56. However, since the signal from the AND circuit 44 of the arithmetic circuit G is not supplied to the step rotation speed detection circuit M, the transistors 65, 70, and 74 are non-conductive and the signal voltage is
S ₂ ' is also not supplied to the thyristor 6, making it impossible to ignite.

In the above embodiment, the rotor 100 of the magnet generator was irregularly magnetized to partially irregularly arrange the magnetic poles, and a part of the output of the capacitor charging coil 1 was provided with a rest part. Also, it is possible to provide a partial pause in the output of the capacitor charging coil 1. Further, in the embodiment described above, the number of poles of the rotor 100 and the stator 300 is 12, but the number of poles of the rotor 100 and the stator 300 may be other numbers such as 8 poles. In addition, although the output signal of the AND circuit 44 was used as the rotation detection input signal of the step rotation speed detection circuit M in the above embodiment, the output signal of the comparator 32, etc.
Any signal wave that generates the presence or absence of a signal in response to forward or reverse rotation may be used.

〔Effect of the invention〕

In the magnet generator type non-contact ignition device of the present invention configured as described above, during normal rotation, the ignition timing characteristic with step advance is obtained by the outputs of the ignition timing control circuit and the step rotation speed detection circuit,
During reverse rotation, no output is supplied from each circuit output to the ignition circuit, so the ignition operation is stopped, which has a great effect.

[Brief explanation of drawings]

Fig. 1 is an electric circuit diagram showing the configuration of an embodiment of the magneto generator contactless ignition device of the present invention, Fig. 2 is a schematic diagram showing the structure of the magneto in the device of the present invention, and Fig. 3 is the device of the present invention. FIG. 4 is a voltage waveform diagram of each part of the device of the present invention when the internal combustion engine rotates normally, and FIG. 5 shows the output of the capacitor charging coil 1 of the device of the present invention when the internal combustion engine rotates normally. FIG. 6 is a diagram showing the phase relationship between the output of the capacitor charging coil 1 of the device of the present invention and the output of the sensor 200 when the internal combustion engine is reversed. 1... Capacitor charging coil, 21... Signal coil, R... Power supply circuit, G... Ignition timing calculation circuit, L... First layered circuit, T... Second layered circuit,
M...Step rotation speed detection circuit, 3...Ignition capacitor, 6...Thyristor, 101, 102...
...Sensor projection, 103...Rotor magnet, 10
0... Magnetrotor, 300... Stator, 2
00...Sensor.

Claims (1)

[Claims] 1. A capacitor discharge type ignition circuit, and one sensor that outputs one polarity and the other polarity alternately at predetermined angles as two systems of alternating signal voltages in one rotation of the magnet generator. and an ignition timing control circuit that inputs the output signal of the sensor as a plurality of reference angle signals and outputs the signal to the ignition circuit, and the magnet generator is configured such that the sensor receives the signal voltage of the first system. The ignition timing control circuit has a capacitor charging coil having a phase such that it does not generate an output when outputting, and generates a negative or positive output when outputting a signal voltage of the second system, and the ignition timing control circuit is connected to the sensor. When the signal voltage of the other polarity is introduced, a signal is output to the ignition circuit, and the calculation capacitor is reset and constant current charging is started, and when the signal voltage of the one polarity is introduced, the constant current is output. An arithmetic circuit that outputs a signal to the ignition circuit when discharge starts and the arithmetic capacitor reaches a constant voltage; and an arithmetic circuit that outputs a signal to the ignition circuit when the arithmetic capacitor reaches a constant voltage; a first stratification for allowing the signal voltage of the other polarity of the second system of the sensor to be introduced into the arithmetic circuit only when the magnet generator rotates normally, and causing the arithmetic circuit to output a signal only when the magnet generator rotates normally; a timer circuit that conducts for a predetermined period of time corresponding to the voltage of the other polarity of the sensor and outputs the signal voltage of the one polarity of the second system generated in the sensor during the conduction period as an output signal; A signal outputted from the arithmetic circuit in response to the forward rotation or reverse rotation of the magnet generator is inputted to a second layered circuit having a second layered circuit, and conducts only for a predetermined period, and when the magnet generator rotates in the normal direction, and a step rotation speed detection circuit that can supply the output signal of the second layered circuit as an ignition signal to the ignition circuit only when the rotation speed of the magnet generator is equal to or higher than a predetermined value. Generator type non-contact ignition device.