JPS638865Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a magnet generator type non-contact ignition device, particularly an electronic advance magnet with a step.

In order to reduce the occurrence of so-called butting that occurs when starting an internal combustion engine, there is a need for a so-called stepped electronic advance angle magnet that delays the fixed advance angle at startup by a step compared to the fixed advance angle at idling. Conventionally, two timing sensors are placed offset in the axial direction to obtain the desired ignition timing pattern, but since this conventional method uses two timing sensors, the cost is high and the reliability of the system is reduced. , disadvantages in terms of engine layout, etc. In addition,
Conventionally, JP-A-56-143351 discloses a non-contact ignition device that controls ignition timing using a single timing sensor, but this conventional device has a different purpose and cannot obtain the desired stepped ignition timing characteristics. It's not a thing.

The present invention has been made in view of the above-mentioned drawbacks, and it is an object of the present invention to provide an ignition device that can reliably obtain stepped ignition timing characteristics using a single timing sensor.

However, the main point of the configuration is that in a non-contact ignition device that controls ignition timing using one timing sensor, the phase of the voltage generated in the capacitor charging coil and the signal coil of the timing sensor is controlled by the first system of the signal coil. The alternating signal voltage of the second signal coil is on the positive side of the alternating output voltage of the charging coil.
By arranging the system so that the alternating signal voltage is generated on the negative side of the alternating output voltage of the charging coil, the first and second systems generated in the signal coil of the sensor are
The system's alternating signal voltage is classified and stratified according to the positive and negative output voltages of the charging coil, making it possible to use them properly like signal voltages from two timing sensors. A further second circuit is controlled by the timer circuit.
Stratify the alternating signal voltage of the grid into positive and negative polarity,
The purpose is to ensure that stepped ignition timing characteristics with two types of fixed advance angles are obtained.

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the entire circuit of one embodiment of the present invention.
is a capacitor charging coil provided in the stator 300 of the magneto, which will be described later. 2 is a diode,
3 is the ignition capacitor, 4 and 5 are the ignition coil IG
A primary coil and a secondary coil, 6 a thyristor, and 46 a gate resistor form a capacitor discharge type ignition circuit. 7 and 8 are diodes, 9 is a power supply capacitor for an ignition timing calculation circuit to be described later, and 10, 11, and 12 are regulating thyristors, resistors, and Zener diodes. Reference numerals 8 to 12 form a regulator circuit R. 13, 14, 15, 16, 17 are resistors, diodes, resistors, resistors, and transistors that detect the negative voltage of the charging coil 1; 18, 19, 2;
0 is a resistor, a transistor that becomes conductive when the charging coil 1 is in a negative direction voltage, and a resistor, and numerals 15 to 20 form a stratified circuit L. The stratified circuit L of this embodiment is a polarity sensing switch circuit that turns on transistors 17 and 19 when the capacitor charging coil 1 has a negative voltage. 21 is a signal coil of a timing sensor, and 22 and 23 are diodes. The signal coil 21 is built into a timing sensor 200, which will be described later. 24, 25, and 26 are resistors, and 27, 28, 29, and 30 are resistors, which are used to create a reference voltage for the comparators 31 and 32. 33 is an R-S flip-flop, 34
35 and 36 are constant current circuits for constant current discharging and constant current charging of the calculation capacitor 37, and 38 is the charge of the calculation capacitor 37. Analog switches 39 and 40 are resistors for resetting (setting to zero)
This is for creating a reference voltage for the comparator 41. 42 is an AND circuit, 43 is an OR circuit, and 44 is a diode, and 24 to 43 form an ignition timing calculation circuit G. 45 is a diode, and 46 is a resistor. 47 is a transistor, 4
8, 49, 50 are resistors, 51 is a transistor, 5
2, 53, 54 are resistors, 55 is a timer capacitor that is charged when the signal coil 21 generates a negative polarity voltage, 56 is a Zener diode, 57
are diodes, and 47 to 57 form a timer circuit T. Transistors 51, 4
7 becomes conductive when the timer capacitor 55 is charged to a predetermined voltage. Note that 61 indicates a spark plug.

FIG. 2 is a structural diagram of the magneto in this embodiment, where 100 indicates two sensor protrusions 10 on the outer periphery.
Magnetrotor with 1a and 101b, 200
is a timing sensor with a built-in signal coil 21,
300 indicates a stator equipped with a capacitor charging coil 1 and other output coils. Moreover, FIG. 3 shows the ignition timing pattern and timing sensor 20 of this embodiment.
A correlation diagram with the alternating signal voltage due to the signal coil 21 within 0 is shown. FIG. 4 shows voltage waveforms at various parts of the circuit shown in FIG. 4. a is the no-load voltage of the capacitor charging coil 1, b is the alternating signal voltage of the first and second systems in the signal coil 21, c is the output of the comparator 32, d is the output of the comparator 31, and e is the flip-flop 33. f is the voltage of the calculation capacitor 37, g is the voltage of the ignition capacitor 3, h is the voltage of the timer capacitor 55, and i is the conduction period of the transistor 51, respectively.

When the rotor 100 rotates once, this rotor 10
0 and the stator 300 have 12 poles, an alternating output voltage shown in FIG. 4a is generated in the capacitor charging coil 1, and two systems of alternating signals shown in FIG. 4b are generated in the signal coil 21 of the timing sensor 200. Voltage is generated. The phase of the alternating output voltage a of the charging coil 1 and the alternating signal voltage b of the signal coil 21 is determined by the positive and negative alternating signal voltages S in the second system within the negative polarity of the alternating output voltage of the charging coil 1. ₃ and S ₄ (especially voltage S ₄ ).
The positive polarity alternating output voltage from the charging coil 1 includes first system positive and negative alternating signal voltages S ₁ and S ₂ from the signal coil 21 . The positive polarity output by the capacitor charging coil 1 causes current to flow through the diode 2, the capacitor 3, the primary coil 4 of the ignition coil IG, and the diode 7;
The ignition capacitor 3 is charged to obtain ignition power. Further, the negative polarity output voltage of the charging coil 1 causes a current to flow through the diode 8, the power supply capacitor 9, the grounding resistor 13, and the diode 14, charging the power supply capacitor 9 in the regulator circuit R, and adjusting the ignition timing. It obtains power for each IC of the arithmetic circuit G 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 voltage of the negative polarity of the charging coil 1 causes a current to flow through the transistor 17 through the resistors 16, 15 and the diode 14, causing the transistor 19 in the stratification circuit L to conduct. On the other hand, in the signal coil 21 of the timing sensor 200, as shown in FIG.
The alternating signal voltages of the first system and second system shown in are generated, and the signal voltages _S1 and _S3 of positive direction are set so that "1" is output to the comparator 31.
Each value of the resistors 27, 28, 24, 25, and 26 is determined. In addition, as described later, the timer circuit T
When the transistor 47 becomes conductive, the ignition thyristor 6 is made conductive by the positive polarity signal voltage from the signal coil 21 via the transistor 47, the resistor 48, and the diodes 23, 45, and the plug 6 is turned on.
Light 1. For the negative polarity signal voltages S ₂ and S ₄ of the signal coil 21, respective resistance values are set so as to charge the timer capacitor 55. The voltage of the charged timer capacitor 55 is discharged with a time constant determined by the resistors 52 and 53 in parallel with the capacitor 55 as shown in FIG. 4
7 becomes conductive (turned on). Capacitor charging coil 1
When the output is in the negative direction, the transistors 17 and 19 in the layered circuit L are conductive as described above, so
The negative polarity signal voltage S ₄ of the signal coil 21 generated during the phase of the negative output of the capacitor charging coil 1 pulls the negative terminal (-) of the comparator 32 in the negative direction. At this time, the resistor 29,
A value of 30 is determined. When “1” is output from the comparator 32, the flip-flop 33
, and a signal is input to the OR circuit 43. In addition, the analog switch 38 is closed by the output of the OR circuit 43, and the calculation capacitor 37 is closed.
At the same time, the thyristor 6 is made conductive through the diode 44, and the plug 61 is ignited.

The operation will be explained below based on the above settings. first,
The operation at a low rotational speed _N1 (at the time of starting the internal combustion engine) which is less than the rotational speed _N2 shown in FIG. 3 will be explained.
When the rotor 100 rotates, an alternating output voltage shown in FIG. 4a is generated in the capacitor charging coil 1, and the ignition capacitor 3 is charged in a stepwise manner through the diode 2 with a positive output as shown in FIG. 4g. I'll go. The power supply capacitor 9 of the regulator circuit 9 is charged by the negative direction output of the charging coil 1, and the voltage Vc.c. Constant current charging is performed as shown in Figure f. Next, when the positive signal voltage _S1 in the first system is generated in the signal coil 21, "1" is output from the comparator 31, and the flip-flop 3
Since the Q output of No. 3 is set to "1" and the analog switch 34 is closed, the calculation capacitor 37 starts constant current discharge as shown by the solid line in FIG. 4 f via the constant current circuit 35 and analog switch 34. . On the other hand, the signal coil 21 has a negative polarity signal voltage S ₂
While this is not occurring, the transistor 51 in the timer circuit T is not yet conductive and the transistor 47 is also cut off (off), so nothing is output to the thyristor 6. Furthermore, rotor 100
rotates, and a negative signal voltage S ₂ is applied to the signal coil 21.
occurs, the diode 57 and the resistor 54
The timer capacitor 55 is charged via the timer capacitor 55.
The electric charge charged in the capacitor 55 is transferred to the resistor 52,5.
3, it is discharged as shown in Fig. 4h, and the transistor ₅₁ is made conductive for a certain period of time as shown in Fig. 4i, and the transistor 47 is also made conductive for a similar period, but at a low _N1 rotation below _N2 rotation, during this period Since the time constant TN ₁ is set short so that other signal voltages S ₃ and S ₄ do not enter the transistor 47, nothing is output to the thyristor 6. Also, charging coil 1
is a positive direction output, and the transistors 17 and 19 of the stratified circuit L are cut off, so that the negative polarity signal voltage S ₂ in the signal coil 21 is not outputted to the comparator 32 either. Next, even if a positive signal voltage S ₃ in the second system is generated in the signal coil 21, this signal voltage S ₃ is not input to the thyristor 6 because the transistor 47 of the timer circuit T has already been cut off. The positive signal voltage _S3 is input to the positive terminal of the comparator 31 and an output "1" is output as shown in FIG.
There is no ignition operation. Finally, when a negative signal voltage S ₄ is generated in the signal coil 21 as shown in FIG. 4b, the timer capacitor 55 is charged by the same operation as the negative signal voltage S ₂ described above. At the same time, since the transistor 17 of the layered circuit L is conductive due to the negative direction output of the capacitor charging coil 1, the transistor 19 is also conductive, and the negative terminal of the comparator 32 is pulled in the negative direction by the signal voltage _S4 . and outputs “1”. When the comparator 32 outputs "1" (FIG. 4c), the flip-flop 33 is reset and the RO circuit 43 is reset.
"1" is output to the gate of the thyristor 6 through the diode 44, and the thyristor 6 becomes conductive.
Plug 61 is ignited. The output of the OR circuit 43 is also applied to the analog switch 38, and when this switch 38 is closed, the calculation capacitor 3
7 is instantly discharged and reset (4th
Figure f). For less than _N2 rotations shown in the third figure, the above operation is repeated, and the ignition timing _θL2 (retard) determined by the generation position of the signal voltage _S4 is delayed.

As the rotation speed increases, the charging pressure of the timer capacitor 55 in the above-mentioned timer circuit T increases as shown in Fig. 4h, and the discharging time also becomes _relatively longer. Since a positive signal voltage S ₃ is generated by the signal coil 21 while the transistor 47 is conducting, this signal voltage S ₃ makes the thyristor 6 conductive via the transistor 47 and the diode 45, and ignites. Therefore, in the _N2 rotation shown in FIG. 3, a step occurs in the ignition timing _θH2 determined by the generation position of the signal voltage _S3 . In addition, in _N2 rotations, a negative polarity signal voltage _S4 is then applied to the signal coil 21.
When this occurs, “1” is output as shown in Fig. 4c, and even if the thyristor 6 is made conductive by outputting “1” to the comparator 32, the ignition capacitor 3 is not charged as shown in Fig. 4g. Since there is no ignition, it does not ignite, and the flip-flop 33 is reset, and the
By making the analog switch 38 conductive via the OR circuit 43, the calculation capacitor 37 is reset. As described above, at _N2 rotations, the ignition timing steps from θL ₂ to θH ₂ , which is determined by the position where the positive signal voltage S ₃ is generated, and the ignition timing due to the positive signal voltage S ₃ is
N Repeated up to ₃ rotations.

As the rotation of the rotor 100 increases, the charging time of the calculation capacitor 37 of the ignition timing calculation circuit G becomes shorter, so the voltage of this capacitor 37 _gradually decreases. Because the voltage during current discharge reaches (decreases) the reference voltage VTH as shown in Figure 4 f, at _N3 rotations or more, the constant current discharge of the calculation capacitor 37 occurs regardless of the position where the signal voltage _S3, etc. is generated. The voltage at is the reference voltage of the comparator 41
When VTH is reached, this comparator 41 outputs "1", and the AND circuit 42 and OR circuit 4
The thyristor 6 is made conductive through the thyristor 3 and the diode 44 to perform the ignition operation (FIG. 4g). This operation is repeated up to _N5 rotations, and constant current charging, constant current discharging, and constant voltage detection are performed, so as the rotational speed increases, the charging period of the calculation capacitor 37 becomes shorter, and the voltage at the start of discharging increases. As the ignition timing becomes lower, the ignition timing advances linearly. Therefore,
From _N3 rotations to _N5 rotations, a linear advance characteristic as shown in FIG. 3 is obtained.

At _N5 rotations, as shown by the two-dot chain line in _FIG .
Since the reference voltage VTH is reached, the comparator 41 generates an output of "1". When the signal voltage S ₁ is applied from the signal coil 21 to the comparator 31 via the layered circuit L, the “1” output of the comparator 31 outputs “1” to the Q terminal of the flip-flop 33, and the AND circuit 42 and the OR circuit 4
3 and the diode 44, the thyristor 6 is made conductive and ignition is performed. Although the thyristor 6 becomes conductive due to the positive polarity signal voltage S ₃ and the negative polarity signal voltage S ₄ from the signal coil 21, ignition does not occur because the ignition capacitor 3 has no charge. Moreover, "1" is generated in the comparator 32 by the negative polarity signal voltage _S4 from the signal coil 21, the ignition timing calculation circuit G is reset, and the ignition operation by the signal voltage _S1 is repeated. The negative signal voltage S ₂ from the signal coil 21 makes the timer circuit T conductive for a predetermined period of time.

When the engine speed exceeds N ₅ revolutions, the signal voltage S ₁
At the time of occurrence, the charging voltage of the calculation capacitor 37 in the ignition timing calculation circuit G becomes lower than the reference voltage of the comparator 41, so "1" is output to the comparator 41, and the output of the comparator 31 due to this signal voltage _S1 Based on this, when the flip-flop 33 generates a Q output, the AND circuit 42,
Through the OR circuit 43 and the diode 44, the thyristor 6 is made conductive and ignited.

Furthermore, the operation of the timer circuit T will be explained in detail. When the voltage of the timer capacitor 55 depends only on the voltage values of the negative signal voltages S ₂ and S ₄ of the signal coil 21, the signal voltage of the signal coil 21 increases as the engine speed increases, and the signal voltage of the signal coil 21 increases as the engine speed increases. As shown by the broken line in FIG. 5, the voltage of the timer capacitor 55 increases. That is, the transistors 51, 4
The conduction period TN of 7 is the timer capacitor 5.
Since it is directly proportional to the voltage of 5, it has a characteristic as shown by the broken line in FIG. When the conduction period TN of the transistor 47 during N rotations is converted into an angle θT, it is expressed by the following equation, resulting in a characteristic as shown by the broken line in FIG.

Angle θT = 6・N・TN Since the timer circuit T is triggered by the negative polarity signal voltages S ₂ and S ₄ of the signal coil 21, the signal voltage
When the angle θT of the timer time TN triggered by S ₄ matches the angle θX between the signal voltages S ₄ and S ₁ of the signal coil 21, as shown in the waveform shown in FIG. 4b, The signal voltage S ₁ causes the thyristor 6 to conduct through the transistor 47 and ignite. Therefore, with the ignition timing characteristics shown in Figure 3, for the rotational speed _N5 at which the advance ends, θX = 6・NX・
It is easy to understand that when the rotational speed NX at which T is low (N ₅ >NX), the angle is advanced in steps at the rotational speed NX that is in the middle of advancing. However, the present invention has the fifth,
The conduction period of the transistor 47 of the timer circuit T is controlled by the engine speed so that N5<<NX as shown by the solid line in FIGS. 6 and 7. In this embodiment, the Zener diode 56 is used to Since the constant of the Zener diode 56 is set so that the voltage of the timer capacitor 55 remains at a constant value above the set rotation speed, correct advance angle is performed. In addition, in FIG. 4 h and FIG. 4 i, the voltage N ₄ of the timer capacitor 55 of the timer circuit T during N ₄ rotations and the conduction period TN ₄ of the transistor 47 are shown by broken lines, respectively, and the voltage N ₄ and the conduction period TN ₄ show the temporal changes when the Zener diode 56 is added, and the voltage N ₄ ' and the conduction period TN ₄ ' show the temporal changes when the Zener diode 56 is not added.

To summarize the above operation, when the engine speed is less than N ₂ rotations, the ignition timing is fixed θL ₂ determined by the generation position of the second system negative signal voltage S ₁ by the signal coil 21, and when the engine rotation speed is N ₂ rotations, the timer circuit T is fixed. Due to conduction, the ignition timing steps from the negative signal voltage S ₄ to the ignition timing θH ₂ due to the positive signal voltage S ₃ , and from N ₂ rotations to N ₃ rotations, the ignition timing θH ₂ is fixed due to the positive signal voltage S ₃ of the second system, From N ₃ to N ₅ revolutions, the ignition timing calculation circuit G causes a linear advance, and at N ₅ revolutions or more, the ignition timing θH ₁ is fixed, determined by the position where the positive signal voltage S ₁ of the first system is generated. You can get it. The above operation is performed by classifying and stratifying the signal voltage of the first system and the signal voltage of the second system using the stratification circuit L, so that different operations can be performed even with the same positive or negative signal voltage. This has become possible because of the

Note that in the above embodiment, the signal coil 21
The negative direction voltage of the capacitor charging coil 1 was used to classify and stratify the signal voltage into the first system signal voltage and the second system signal voltage. It's okay,
Alternatively, the voltage of another output coil of the magnet generator or the output voltage of a power generation coil such as a coil in a separately provided sensor may be used. Also,
In the above embodiment, the present invention was explained assuming that the number of poles of the rotor 100 and stator 300 was 12.
Other numbers of poles such as 8 poles may be used. Further, in the above embodiment, the Zener diode 56 that controls the voltage of the timer capacitor 55 to a constant value is used as a means for controlling the conduction period of the timer circuit T depending on the rotation speed, but it is also possible to control the discharge time constant. A method such as doing this may also be used.

As described above, the present invention includes a capacitor discharge type ignition circuit, one timing sensor that outputs two alternating signal voltages per rotation of a magnet generator, and a signal voltage of one polarity of this timing sensor. When the voltage is introduced, a signal is output to the capacitor discharge type ignition circuit, and the calculation capacitor is reset and constant current charging is started. When a signal voltage of another polarity is introduced, constant current discharge is started and the calculation is performed. an ignition timing calculation circuit that outputs a signal to the capacitor discharge ignition circuit when the capacitor reaches a constant voltage;
A generator coil having a phase so as to generate a positive or negative output voltage when generating the alternating signal voltage of the system and a negative or positive output voltage when generating the alternating signal voltage of the second system; a stratified circuit that conducts at a negative or positive voltage of the generator coil; and a timer circuit that conducts for a predetermined period of time that is controlled by the internal combustion engine rotational speed and in accordance with the voltage value of a signal voltage of one polarity of the timing sensor. The signal voltage of the one polarity of the timing sensor can be introduced into the ignition timing calculation circuit when the stratification circuit is conductive, and the signal voltage of the other polarity is applied to the ignition timing calculation circuit, and Since the signal voltage of the other polarity can be introduced into the capacitor discharge type ignition circuit when the timer circuit is conductive, the alternating signal voltage of the first system and the alternating signal voltage of the second system of the timing sensor are classified. Even if the signal voltage is the same positive or polarity, depending on the signal voltage of one polarity of the first system, for example, the negative polarity, the second system may be stratified without activating the capacitor discharge type ignition circuit. To provide an ignition device having stepped ignition timing characteristics by activating a capacitor discharge type ignition circuit via a stratification circuit and an ignition timing calculation circuit depending on a signal voltage of the same polarity, for example, negative polarity, of the system. It has the effect of being able to. Moreover, since it is equipped with a timer circuit that is also controlled by the internal combustion engine rotational speed, advance angle operation is reliable, and since there is only one sensor, the cost is low and the reliability of the system is increased. It has many excellent effects as mentioned above, such as being advantageous for engine layout.

[Brief explanation of the drawing]

FIG. 1 is an electrical circuit diagram showing an embodiment of the present invention;
Fig. 2 is a structural diagram of the magnet generator in the above embodiment, Fig. 3 is a characteristic diagram showing the ignition timing pattern of the device of the present invention, and Fig. 4 is a temporal change in the voltage waveform of each part of the circuit shown in Fig. 1. FIGS. 5 to 7 are characteristic diagrams showing the characteristics of the timer circuit with respect to engine speed. 1... Capacitor charging coil, 3... Ignition capacitor, 4, 5... Primary coil and secondary coil of ignition coil, 6... Thyristor, 21... Signal coil, 37... Calculation capacitor, 55...
Capacitor for timer, 56... Zener diode, 100... Rotor, 200... Timing sensor, G... Ignition timing calculation circuit, L... Stratification circuit, T... Timer circuit.

Claims (1)

[Scope of utility model claims] A capacitor discharge type ignition circuit having a capacitor charging coil, an ignition capacitor, and a thyristor, one timing sensor that outputs two alternating signal voltages per rotation of the magnet generator, and one polarity signal of this timing sensor. When a voltage is introduced, a signal is output to the capacitor discharge type ignition circuit, and the calculation capacitor is reset and constant current charging is started, and when a signal voltage of another polarity is introduced, constant current discharging is started, an ignition timing calculation circuit that outputs a signal to the capacitor discharge type ignition circuit when the calculation capacitor reaches a constant voltage; and a positive or negative alternating output when the timing sensor outputs a first system alternating signal voltage. A power generation coil that has a phase so as to generate a negative or positive alternating output voltage when generating voltage and outputting a second system alternating signal voltage, and a layer that conducts at the negative or positive output voltage of this power generation coil. and a timer circuit that conducts for a predetermined period of time controlled by the internal combustion engine rotational speed in accordance with the voltage value of the signal voltage of the one polarity of the timing sensor, and the one polarity of the timing sensor. can be introduced into the ignition timing calculation circuit when the stratification circuit is conductive, the signal voltage of the other polarity can be applied to the ignition timing calculation circuit, and the signal voltage of the other polarity can be introduced into the ignition timing calculation circuit when the stratification circuit is conductive. A magnet generator type non-contact ignition device, characterized in that it can be introduced into the capacitor discharge type ignition circuit when conductive.