JPH0370117B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an ignition device for an internal combustion engine that includes a vehicle speed limiting circuit that limits the speed of a vehicle driven by the internal combustion engine to a predetermined value or less.

[Prior Art] In order to limit the speed of a vehicle driven by an internal combustion engine to a predetermined value or less, a vehicle speed limiting circuit is provided that prevents ignition operation when the rotational speed of the engine exceeds a preset value. A conventional ignition system for internal combustion engines is known, and in this type of conventional ignition system, the engine rotation speed is detected from the output of a magnet generator, and when the detected rotation speed reaches a set value, the engine ignition timing is set. I was trying to delay it. However, this type of system has the drawback that the speed limit varies depending on the gear selection position of the transmission, and since the ignition timing is delayed, depending on the situation, the engine speed may not immediately decrease. However, there was a drawback that the vehicle speed limiting operation was uncertain. Furthermore, with this type of device, if the user modifies the vehicle speed limiting circuit so that it does not work, the intended purpose cannot be achieved, so it is necessary to prevent such modification from occurring easily. .

[Object of the Invention] An object of the present invention is to make it possible to keep the speed limit constant regardless of the selected gear position of the transmission, and to ensure that the vehicle speed limit operation is performed.
Moreover, it is an object of the present invention to provide an ignition device for an internal combustion engine with a vehicle speed limiting circuit that has improved safety by preventing modifications that would disable the vehicle speed limiting circuit.

[Structure of the Invention] The present invention provides an ignition circuit including an ignition coil and a primary current control circuit that controls the primary current flowing through the primary coil of the ignition coil to suddenly change at the ignition timing of an internal combustion engine; an exciter coil disposed in a magnet generator driven by an internal combustion engine that drives the engine, induces an alternating current voltage in synchronization with the rotation of the engine, and provides ignition energy to the ignition circuit in one half cycle of the alternating voltage. In the ignition device for an internal combustion engine according to the present invention, ignition energy is supplied from the exciter coil to the ignition circuit when a trigger signal is applied at the rise of the one half cycle of the output of the exciter coil. and an ignition energy supply control circuit that allows ignition energy to be supplied from the exciter coil to the ignition circuit when no trigger signal is applied at the rising edge of the one half cycle; a reference voltage generation circuit that is disposed between the drive shaft and generates a reference voltage V1 according to a selected gear position of a transmission that has a plurality of gear positions that are selected when the vehicle travels forward; The first phase whose phase is advanced from the rising position of the one half cycle of the output of the exciter coil.
An integral operation of charging an integral capacitor at a constant time constant from a constant angular position to a second constant angular position whose phase is delayed from the rising position is performed once per engine rotation in synchronization with the engine rotation. an integrating circuit; a comparison circuit that compares the terminal voltage of the integrating capacitor with the reference voltage and provides the trigger signal to the ignition energy supply control circuit when the terminal voltage of the integrating capacitor is less than or equal to the reference voltage; and a set speed abnormality detection circuit that detects a reference voltage and provides the trigger signal to the ignition energy supply control circuit when the reference voltage is below a set level, and the reference voltage generation circuit includes:
a resistive voltage dividing circuit consisting of a voltage dividing resistor and a series resistor connected in series with the voltage dividing resistor, to which a constant DC voltage is applied, and a plurality of gear position detection resistors;
It is equipped with a gear position sensor consisting of a changeover switch that connects a resistor selected from a plurality of gear position detection resistors in parallel to a voltage dividing resistor according to the selected position of the gear of the transmission. is configured to generate a reference voltage across the terminal. Regardless of the selected gear position of the transmission, when the speed of the vehicle reaches the set value, the terminal voltage of the integrating capacitor is made equal to the reference voltage at the rising edge of one half cycle of the output of the exciter coil. The resistance values of the voltage dividing resistor, series resistor, and gear position detection resistor are set.

[Operation of the invention] In the above configuration, when the speed of the vehicle is below the set value, the terminal voltage of the integrating capacitor reaches the reference voltage at the rising edge of one half cycle of the exciter coil, regardless of the gear selection position of the transmission. As described above, the ignition energy supply control circuit allows ignition energy to be supplied from the exciter coil to the ignition circuit, and ignition energy is supplied to the ignition circuit every time the output of one half cycle of the exciter coil occurs. be done. Therefore, in this case, the ignition operation is performed normally. When the vehicle speed exceeds the set value, the ignition energy supply control circuit blocks the supply of ignition energy because the terminal voltage of the integral capacitor is lower than the reference voltage when one half-cycle output of the exciter coil occurs. , stops the ignition operation. The engine will therefore misfire, its rotational speed will drop and the speed of the vehicle will fall below the set value. When the rotation speed of the engine falls below the set value, the ignition energy supply control circuit allows the supply of ignition energy again, so the ignition operation is performed normally, and by repeating these operations, the speed of the engine vehicle is set. limited to less than or equal to the value. In the above device, a reference voltage generation circuit, an integrating circuit, and a comparison circuit constitute a vehicle speed detection circuit that detects the speed of the vehicle, and this vehicle speed detection circuit and an ignition energy supply control circuit constitute a vehicle speed limiting circuit. .

In the above configuration, if the user shorts the reference voltage input terminal of the comparator circuit to make the reference voltage zero, the terminal voltage of the integrating capacitor will always be higher than the reference voltage, so the comparator circuit will not accept the trigger signal. There will be no output. If such modifications are made, the vehicle speed limiting circuit will no longer work, causing the vehicle speed to exceed the legal speed limit, which is dangerous. In the present invention, the set speed abnormality detection circuit outputs a trigger signal when the reference voltage falls below the set level, so when an abnormality is detected in the reference voltage, the ignition energy supply control circuit blocks the supply of ignition energy and ignites the ignition. Stop the operation. As described above, in the device of the present invention, if the reference voltage is lowered to increase the speed limit, or if the reference voltage is reduced to zero to disable the vehicle speed limiting circuit, the ignition operation will no longer be performed. can be prevented.

In addition, if the gear position sensor is removed, regardless of the gear position, the gear position detection resistor will no longer be connected in parallel to the voltage dividing resistor of the resistor voltage divider circuit of the reference voltage generation circuit, so the value of the reference voltage becomes the highest. Therefore, the vehicle speed limit value becomes low, and the vehicle speed limit circuit operates on the safe side.

FIG. 1 shows a configuration example of an ignition system for an internal combustion engine with a vehicle speed limiting circuit to which the present invention is applied. In the figure, 1 indicates a primary coil 1a and a secondary coil 1.
2 is a primary current control circuit that controls the primary current of ignition coil 1 to suddenly change at the ignition timing of the internal combustion engine; 3 is ignition coil 1 and 1;
The ignition circuit includes a secondary current control circuit 2, and a secondary coil 1b of the ignition coil 1 is connected to a spark plug P attached to a cylinder of an engine (not shown). Reference numeral 4 denotes an exciter coil, which is disposed in a magnet generator driven by the internal combustion engine that drives the vehicle, induces an alternating current voltage in synchronization with the rotation of the engine, and generates the above-mentioned voltage in one half cycle of the alternating voltage. Provides ignition energy to the ignition circuit.
5 is a reference voltage generation circuit that generates a reference voltage V1 of different magnitude depending on the selected gear position of the transmission arranged between the internal combustion engine and the drive shaft of the vehicle; 6 is one of the outputs of the exciter coil; An integral operation is performed in accordance with the rotation of the engine to charge an integral capacitor at a constant time constant from a first constant angle position whose phase is ahead of the rising position of the half cycle to a second constant angle position whose phase is delayed from the rising position of the half cycle. Synchronized with engine 1
7 is an integrating circuit that performs the integration once per rotation; 7 is a comparison circuit that compares the terminal voltage V2 of the integrating capacitor with the reference voltage V1 and outputs a trigger signal when the terminal voltage V2 of the integrating capacitor is lower than the reference voltage V1; 8;
prevents ignition energy from being supplied from the exciter coil to the ignition circuit when the trigger signal is applied at the rising edge of one half cycle of the output of the exciter coil 4 in the direction of the solid arrow shown in the figure; The ignition energy supply control circuit allows ignition energy to be supplied from the exciter coil to the ignition circuit when a trigger signal is not applied at the start of a cycle.
Reference voltage generation circuit 5, integration circuit 6 and comparison circuit 7
A vehicle speed detection circuit is constructed, and this detection circuit 9
and the ignition energy supply control circuit 8 constitute a vehicle speed limiting circuit.

In order to prevent modification by the user, a set speed abnormality detection circuit is provided that detects the reference voltage V1 and provides a trigger signal to the ignition energy supply control circuit 8 when the reference voltage is below a set level, and one of the outputs of the exciter coil The supply of ignition energy is also blocked during the half cycle when a trigger signal is applied from the set speed abnormality detection circuit to the ignition energy supply control circuit.

The reference voltage generation circuit 5 includes a resistive voltage dividing circuit consisting of a voltage dividing resistor and a series resistor connected in series with the voltage dividing resistor, to which a constant DC voltage is applied to both ends, and a plurality of gear position detection resistors. and a gear position sensor consisting of a changeover switch that connects a resistor selected from a plurality of gear position detection resistors in parallel to a voltage dividing resistor according to the selected gear position of the transmission. The piezoresistor is configured to generate a reference voltage across the piezoresistor. In the present invention, regardless of the selected gear position of the transmission, when the speed of the vehicle reaches the set value, one half cycle of the output of the exciter coil (a half cycle that provides ignition energy to the ignition circuit 3) The resistance values of the voltage dividing resistor, series resistor, and gear position detection resistor are set so that the terminal voltage of the integrating capacitor is equal to the reference voltage when the voltage rises.

In order to supply power to the control section, a power supply circuit 16 is provided which includes a battery 13 and a constant voltage control circuit 15 that receives the output of the battery 13 and outputs a substantially constant DC voltage Ec. A power switch 14 is provided between the control circuit 15 and the control circuit 15 . The output Ec of this power supply circuit is connected to a reference voltage generation circuit 5, an integration circuit 6, a comparison circuit 7, and a set speed abnormality detection circuit 12 through connection lines (not shown).
is supplied to. When power is supplied to the control unit using a battery in this way, it is dangerous because if the battery is accidentally or intentionally removed, the vehicle speed limiting circuit will no longer work. Therefore, in this example, a battery abnormality detection circuit 17 is provided which supplies a trigger signal from the exciter coil 4 side to the ignition energy supply control circuit 8 when the voltage applied from the battery 13 disappears. The supply of ignition energy is also blocked when a trigger signal is given from this battery abnormality detection circuit to the ignition energy supply control circuit 8 at the start of a half cycle.

In the above configuration, the ignition circuit 3 is electrically connected to the ignition energy storage capacitor charged by the output of one half cycle of the exciter coil 4 at the ignition timing, and transfers the charge of the ignition energy storage capacitor to the primary circuit of the ignition coil. A capacitor discharge type circuit may be used, which is composed of a discharge control thyristor that discharges a discharge to the coil, and after the output of one half cycle of the exciter coil is short-circuited by a semiconductor switch, the semiconductor switch is turned off at the ignition timing of the engine. A current cut-off type ignition circuit may be used in which a high voltage is induced in the exciter coil, and the high voltage is further boosted by the ignition coil.

As an example, in the above ignition device, the ignition circuit 3
Figures 3 and 4 show the operating waveforms when using a capacitor discharge type circuit as shown in Figure 2.
As shown in the figure. In FIG. 2, 201 is an ignition energy storage capacitor connected in series to the primary coil of the ignition coil, and 202 is a capacitor 2.
01 is a discharge control thyristor which is connected in parallel to both ends of the series circuit with the primary coil 1a and whose cathode is grounded; and 203 is a discharge control thyristor whose cathode is connected to the connection point between the anode of the thyristor 202 and the capacitor 201, and whose anode supplies ignition energy. This is a diode connected to the non-ground terminal of the exciter coil 4 through the control circuit 8. The exciter coil 4 is disposed within a four-pole magnet generator that is driven in synchronization with the rotation of the internal combustion engine that drives the vehicle, and induces two cycles of alternating current voltage per rotation of the engine. The capacitor 201 is connected to the ignition energy supply control circuit 8
allows the supply of ignition energy, the output voltage of the exciter coil 4 in one half cycle in the direction of the solid arrow shown in the figure (hereinafter referred to as positive direction voltage).
is charged to one polarity. Reference numeral 10 denotes a signal supply circuit that supplies a firing signal to the thyristor 201 using the output voltage of the other half cycle of the exciter coil 4 in the direction of the dashed arrow shown in the figure (hereinafter referred to as negative direction voltage);
1 is an exciter short circuit that shorts the exciter coil 4 after a firing signal is supplied to the thyristor 201 in order to protect the components of the signal supply circuit 9 from excessive voltage. This short-circuit circuit 11 is composed of a switch element that short-circuits the exciter coil 4 and a trigger circuit that triggers the switch element after an ignition signal is applied to the thyristor 201.

Figures 3 and 4 show the output voltage Ve of the exciter coil 4 and the integral circuit when the exciter coil 4 is arranged in a 4-pole magnet generator using a capacitor discharge type ignition circuit as shown in Figure 2. Figure 3 shows the waveforms of the terminal voltage V2 of the integrating capacitor 6, the reference voltage V1, and the terminal voltage Vc of the capacitor 201. Figure 3 shows the case where the engine rotation speed (rpm) is slightly lower than the set value. Figure 4 shows a case where the engine speed exceeds the set value.

When the engine speed is below the set value, the positive direction voltage of the exciter coil 4 in the direction of the solid arrow shown in the diagram
Since the terminal voltage V2 of the integrating capacitor of the integrating circuit 6 is equal to or higher than the reference voltage V1 at the rising angle 1 of Ve, the ignition energy supply control circuit 8 does not prevent the capacitor 201 from being charged. Therefore, at this time, the capacitor 201 is connected to the positive direction voltage of the exciter coil 4 (the output of the positive half cycle in FIG. 3A) V11.
is charged by This charging current causes a phase delay in the voltage Ve of the exciter coil 4, and when the charging of the capacitor 201 is completed at angle 2, the output voltage Ve of the exciter coil 4 rapidly falls. When the negative direction voltage V21 of the exciter coil 4 rises at angle 2, almost at the same time, the signal is applied to the thyristor 20 from the exciter coil 4 through the signal supply circuit 10.
2 is given the firing signal. This causes the thyristor 202 to conduct, causing the capacitor 201 to discharge through the thyristor 202 to the primary coil 1a of the ignition coil. Therefore, a large magnetic flux change occurs in the iron core of the ignition coil 1, and a high voltage for ignition is generated in the secondary coil 1b. As a result, a spark is generated in the spark plug P, and the engine is ignited. After the ignition signal is applied to the thyristor 202, when the negative output of the exciter coil 4 exceeds the set value at angle 3, the switch element of the exciter short circuit 11 becomes conductive, shorting the output of the exciter coil 4. Next, when the exciter coil 4 outputs the second positive voltage V12 at angle 4, the terminal voltage V2 of the capacitor of the integrating circuit 6 has become equal to or higher than the reference voltage V1, so the capacitor 201 is charged in the same manner as described above. When charging of the capacitor 201 is completed at angle 5, the terminal voltage V12 of the exciter coil 4 quickly becomes zero, and the negative direction voltage V22 rises. At this time, an ignition signal is applied to the thyristor 202 from the signal supply circuit 10, the thyristor becomes conductive, and an ignition operation is performed. Next, when the negative voltage of the exciter coil 4 reaches a predetermined value at angle 6, the short circuit 11 operates to short-circuit the exciter coil 4. If the internal combustion engine is a single cylinder, the spark generated at the spark plug at angle 2 becomes a regular ignition spark, and the spark generated at the spark plug at angle 5 becomes a waste spark. Also, if the internal combustion engine has two cylinders, the spark generated at angle 2 will be the normal ignition spark for the first cylinder,
The spark generated at angle 5 becomes the regular ignition spark for the second cylinder.

As shown in FIG. 4, after the capacitor 201 is charged at angle 11 and the ignition operation is performed at angle 12, when the vehicle speed exceeds the set value,
Since the rotational speed of the engine exceeds the set value set according to the gear selection position of the transmission, the terminal voltage of the capacitor of the integrating circuit 6 increases when the positive direction voltage V12 of the exciter coil rises at angle 14. V2 is still below the reference voltage (set to a different value depending on the gear selection position of the transmission) V1 (as the rotation speed increases, the integration capacitor cannot be charged in time). Therefore, at this time, the comparator circuit 7 controls the ignition energy supply control circuit 8 to prevent charging of the capacitor 201. At this time, the load on the exciter coil 4 is only the electronic components of the control circuit, and the positive output voltage waveform of the exciter coil 4 that rises at an angle of 14 becomes close to the waveform under no load.
Negative voltage V21 of exciter coil 4 at angle 15
When the voltage rises, a point super signal is given to the thyristor 202. As a result, thyristor 202 becomes conductive, but since capacitor 201 is not charged at this time, no ignition operation is performed. then angle 16
The short circuit 11 operates to short-circuit the exciter coil 4. Next, at angle 17, the positive direction voltage V11 of the exciter coil 4 rises, but at this time, the terminal voltage V2 of the capacitor of the integrating circuit 6 is still equal to the reference voltage V1.
ignition energy supply control circuit 8 prevents capacitor 201 from charging. hence the angle
Even if the negative direction voltage V21 of the exciter coil rises at step 18 and an ignition signal is applied to the thyristor 202, no ignition operation is performed.

As described above, when the vehicle speed exceeds the set value and the engine speed exceeds the set value set according to the gear selection position of the transmission, ignition energy is supplied to the ignition circuit 3. Because it is prevented,
Ignition operation is blocked, engine speed is reduced, and vehicle speed is limited below a set value. in this case,
The reference voltage generating circuit 5 makes the terminal voltage of the integrating capacitor equal to the reference voltage at the rise of the positive output of the exciter coil 4 when the speed of the vehicle reaches a set value, regardless of the selected gear position of the transmission. Since different reference voltages are generated depending on the gear selection position of the transmission, the speed of the vehicle can be limited to a certain speed or less regardless of the gear selection position of the transmission.

[Embodiments of the Invention] Examples of the present invention will be described below with reference to FIGS. 5 to 8.

FIG. 5 shows an embodiment that embodies each part of FIG. 1. In this embodiment, a diode 204 with its cathode facing the ground side is connected in parallel to both ends of the primary coil 1a of the ignition coil 1. ing. The anode of a thyristor 21 for ignition energy supply control is connected to the non-grounded terminal of the exciter coil 4, and the cathode of the thyristor 21 is connected to the anode of a diode 203 whose cathode is connected to the connection point between the capacitor 201 and the thyristor 202 for discharge control. It is connected to the. The cathode of a Zener diode 24 is connected to the anode of the thyristor 21 via a resistor 23.
The anode of is connected to a diode 25 whose cathode is connected to the gate of the thyristor 21. A resistor 26 is connected in parallel between the gate and cathode of the thyristor 21, an anode of a thyristor 27 whose cathode is grounded is connected to the connection point between the resistor 23 and the Zener diode 24, and a resistor 28 is connected in parallel between the gate and cathode of the thyristor 27. has been done. The thyristor 21, the resistor 23, the Zener diode 24, the diode 25, the resistor 26, the thyristor 27, and the resistor 28 constitute the ignition energy supply control circuit 8.

The signal supply circuit 10 that provides an ignition signal to the discharge control thyristor 202 includes a resistor 30 connected in parallel between the gate and cathode of the thyristor 202, a capacitor 31 whose one end is connected to the gate of the thyristor 202, and the other end of the capacitor 31. and thyristor 2
A resistor 32 connected between the cathode of the thyristor 32 and the cathode of the thyristor 33, a thyristor 33 connected in parallel to both ends of the resistor 32 with the anode facing the ground side, and a resistor 34 connected between the gate cathode of the thyristor 33 and the gate anode of the thyristor 33. It consists of a Zener diode 35 connected in between with its cathode facing the ground side, and a diode 36 whose anode is connected to the cathode of the thyristor 33, and the cathode of the diode 36 is connected to the non-ground side terminal of the exciter coil 4.

The integrating circuit 6 includes an integrating capacitor 40 whose one end is grounded, a transistor 41 in which a collector-emitter circuit is connected in parallel to both ends of the capacitor 40 with the emitters facing the ground side, and the collector is connected to the base of the transistor 41. a transistor 42 whose anode is grounded, a diode 43 whose anode is grounded and whose cathode is connected to the base of the transistor 42, one end of which is connected to the base of the transistor 42, the collector of the transistor 42, and the collector of the transistor 41, and the other end is common. It consists of connected resistors 44, 45, and 46, and a diode 48 whose anode is connected to the base of a transistor 42 via a resistor 47, and the cathode of the diode 48 is connected to the non-grounded terminal of the exciter coil 4. . Resistors 44, 45 and 46
The output of the battery 13 is applied between the input terminals of the power supply circuit 15 via a diode 51 and a power switch 14.

The reference voltage generation circuit 5 is made up of a voltage dividing resistor 55 and a series resistor 54 connected in series with the voltage dividing resistor, and has a resistor component across which a constant DC voltage obtained from the constant voltage control circuit 15 is applied. It consists of a pressure circuit, a plurality of gear position detection resistors R1 to R3, and a changeover switch S as a gear position sensor that is interlocked with gear selection means (for example, a change lever) of the transmission. The changeover switch S connects a resistor selected from the gear position detection resistors R1 to R3 in parallel to the voltage dividing resistor 55 according to the selected gear position.

The illustrated changeover switch S consists of a movable contact Sa and fixed contacts A1 to A5 that the movable contact Sa contacts in sequence. When the changeover lever of the transmission (not shown) is in the neutral position, the movable contact Sa contacts the fixed contact A1.
The lever contacts the fixed contact A2 when the lever is in the first to third speed positions. Furthermore, when the switching lever is in the fourth speed and fifth speed positions, the movable contacts Sa come into contact with the fixed contacts A4 and A5, respectively. In this example,
Contact A6 is a play contact. One end of the gear position detection resistors R1 to R3 is commonly connected to the connection point (voltage division point) of the series resistor 54 and the voltage dividing resistor 55, and the other end is connected to the fixed contacts A2 to R3 of the changeover switch S, respectively.
Grounded through A4. Therefore, when the switching lever of the transmission is in the first to third speed positions, the movable contact Sa contacts the fixed contact A2, and the gear position detection resistor R1 is connected in parallel to the voltage dividing resistor 55.
When the transmission switching lever is in the 4th and 5th speed positions, the movable contact Sa contacts the fixed contacts A4 and A5, respectively, and thereby the gear position detection resistors R2 and R3 are connected to the voltage dividing resistor 55. Connect both ends in parallel. Therefore, the reference voltage V1 appearing across the voltage dividing resistor 55 differs depending on the gear selection position of the transmission, and is different when the transmission is in the first to third gear positions, when it is in the fourth gear position, and when the transmission is in the fourth gear position. The values of reference voltage V1 when in the 5th speed position are V1a to V1a respectively.
Assuming V1c, there is a relationship of V1a>V1b>V1c.
Here, the value of V1a is such that when the vehicle speed reaches the set value with the transmission in the third gear position, it becomes equal to the terminal voltage of the capacitor of the integrating circuit at the rising edge of one half cycle of the exciter coil. V1b and V1c are the values of the integrator circuit at the rising edge of one half cycle of the exciter coil when the vehicle speed reaches the set value with the transmission in the 4th and 5th gear positions, respectively. The size is set to be equal to the terminal voltage of the capacitor. In this example, the reference voltage is
Although V1 is kept constant, it goes without saying that a different reference voltage may be generated for each shift position.

The reference voltage V1 is input to the comparator circuit 7 together with the terminal voltage V2 of the capacitor 40 of the integrating circuit 6, and the output terminal of the comparator circuit 7 is connected to the gate of the thyristor 27 via the diode 56. The output terminal of the comparison circuit 7 is also connected to the cathode of the diode 51 via a resistor 57. Comparison circuit 7
When V2≦V1, the output terminal is ungrounded, and an ignition signal (trigger signal of the ignition energy supply control circuit 8) is sent from the battery 13 to the thyristor 27 via the switch 14, diode 51, resistor 57, and diode )give. Furthermore, when the engine speed exceeds the set speed set according to the selected position of the transmission and V2>V1, the output terminal of the comparator circuit 9 becomes grounded, and at this time an ignition signal to the thyristor 27 is output. supply is blocked.

In the above embodiment, when no negative voltage is induced in the exciter coil 4, the integrating circuit 6
A base current is applied to the transistor 42 from the battery 13 side, and the transistor 42 becomes conductive.
At this time, transistor 41 is in a cutoff state. When the transistor 41 is in the cutoff state, the capacitor 40 is charged by the output of the constant voltage control circuit 15 at a constant time constant. When a negative voltage is induced in the exciter coil 4, a diode 43, a resistor 47, and a diode 48 are generated from the exciter coil 4.
Current flows through the transistor 42, and the forward voltage drop across the diode 43 reverse biases the base-emitter of the transistor 42. Therefore, almost at the same time when the negative voltage of the exciter coil 4 rises, the transistor 42 is turned off and the transistor 41 is turned on. As a result, the charge in the capacitor 40 is almost instantaneously discharged through the transistor 41, and the integrating circuit 6 is reset. Next, as a result of the operation described below, the thyristor 33 of the signal supply circuit becomes conductive and the negative voltage of the exciter coil 4 is short-circuited, the transistor 42 becomes conductive again, the transistor 41 is cut off, and charging of the capacitor 40 is started. . Therefore, in the integrating circuit 6, when the negative voltage of the exciter coil 4 rises, the capacitor 40 is discharged, and the exciter coil 4 is discharged.
Charging of the capacitor 40 is started when the negative voltage of the capacitor 40 is short-circuited.

The set speed abnormality detection circuit 12 is the constant voltage control circuit 1
A resistive voltage divider circuit consisting of a series circuit of resistors 12a and 12b connected to the output terminal of the voltage divider circuit 12c, and a comparison circuit 12c that compares a set level Vo obtained across the resistor 12b of the voltage divider circuit with a reference voltage V1. , a resistor 12d that connects the output terminal of the comparison circuit 12c to the cathode of the diode 51, and a diode 12e that connects the output terminal of the comparison circuit 12c to the gate of the thyristor 27, and when the reference voltage V1 is below the set level Vo. The output terminal of the comparator circuit 12c is ungrounded, and a trigger signal is applied to the thyristor 27 through the resistor 12d and the diode 12e.

The battery abnormality detection circuit 17 includes a diode 17a whose anode is connected to the non-grounded terminal of the exciter coil 4, a capacitor 17c connected between the cathode of the diode 17a and the ground via a resistor 17b, and an emitter connected to the collector. resistance 1
7d, a transistor 17e connected to the non-grounded terminal of the capacitor 17c, a diode 17f connecting the collector of the transistor 17e to the gate of the thyristor 27, and the transistor 17e.
and a resistor 17g whose base is connected to the output terminal of the constant voltage control circuit 15. In this detection circuit 17, when the battery 13 is connected, the transistor 17e is conductive;
No firing signal is given to the thyristor 27 through the diode 17f. On the other hand, when the battery 13 is removed, the transistor 17e is cut off, so that when the positive voltage of the exciter coil 4 rises, the residual charge in the capacitor 17c passes between the resistor 17d, the diode 17f, and the gate and cathode of the thyristor 27. The discharge occurs, thereby providing a firing signal to the thyristor 27.

In the device shown in FIG. 5, when a positive voltage (voltage in the direction of the solid arrow shown in the figure) is generated in the exciter coil 4, an ignition signal is supplied to the thyristor 21 through the resistor 23, the Zener diode 24, and the diode 25. conducts. When the thyristor 21 becomes conductive, the exciter coil 4
From thyristor 21, diode 22, capacitor 201, diode 204 and primary coil 1a
A current flows through the capacitor 201, and the capacitor 201 is charged. When the engine speed is below the set value, the terminal voltage V2 of the integrating capacitor 40 becomes the reference voltage V1 at the moment when the positive voltage of the exciter coil 4 is generated.
Therefore, the output terminal of the comparator circuit 9 is at ground potential, and no firing signal is supplied to the thyristor 27. Therefore, the thyristor 27 does not become conductive and prevent the thyristor 21 from becoming conductive, and the capacitor 201 can be charged without any problem. When a negative voltage (in the direction of the dashed arrow in the figure) is generated in the exciter coil 4, current flows from the exciter coil 4 through the resistor 30, capacitor 31, and diode 36, and the capacitor 31 is charged. When the charging of the capacitor 31 progresses and the voltage across the resistor 32 reaches a predetermined value, the Zener diode 35
becomes conductive, and an ignition signal is supplied to the thyristor 33. As a result, the thyristor 33 becomes conductive, the charge in the capacitor 31 is discharged through the gate and cathode of the thyristor 202 and the thyristor 33, and an ignition signal is supplied to the discharge control thyristor 202. Therefore, the thyristor 202 conducts,
Capacitor 201 discharges through thyristor 202 and primary coil 1a. This causes a large magnetic flux change in the iron core of the ignition coil, and a high voltage for ignition is generated in the secondary coil 1b. Since this high voltage is applied to the ignition plug P, a spark is generated in the ignition plug and the engine is ignited. When the thyristor 33 becomes conductive, the negative voltage of the exciter coil 4 is short-circuited through the thyristor 33 and the diode 36. This prevents excessive voltage from being applied to the components of the signal supply circuit. That is,
In this embodiment, thyristor 33 and diode 3
6 constitute an exciter short circuit 10 in FIG. When the negative voltage of the exciter coil 4 is short-circuited by this short circuit, the reverse bias between the base and emitter of the transistor 42 is released, so the transistor 42 becomes conductive.
Transistor 41 is turned off. Therefore, the thyristor 33 becomes conductive and the negative voltage of the exciter coil 4 is short-circuited, and at the same time the integrating capacitor 40
charging starts.

When the engine speed exceeds the set value, the integration capacitor 40 cannot be charged in time, and when a positive voltage with a larger peak value is generated in the exciter coil 4, the terminal voltage V2 of the capacitor 40 reaches the reference voltage V1. Since the voltage has not yet reached , the output terminal of the comparator circuit 7 is in an ungrounded state. Therefore, at this time, an ignition signal is applied from the battery 13 to the thyristor 27 through the resistor 57 and the diode 56, and the thyristor 27 becomes conductive. At this time, almost all of the current flowing from the exciter coil 4 through the resistor 23 flows through the thyristor 27. Therefore, the thyristor 21 is not conductive and the capacitor 20
1 charging is not performed. Therefore, in this case, even if a negative voltage is generated in the exciter coil 4 and an ignition signal is applied to the thyristor 202, no ignition operation is performed.

If the reference voltage V1 falls below the set level for some reason, for example, if the voltage dividing resistor 55 of the reference voltage generation circuit is short-circuited for the purpose of canceling the vehicle speed restriction, the set speed abnormality detection circuit 12 sends a signal to the thyristor 27. Since the ignition signal is applied to the thyristor 27, the thyristor 27 becomes conductive at the same time as the positive output voltage of the exciter coil 4 rises, blocking the supply of ignition energy and stopping the ignition operation.

Furthermore, when the gear position sensor (switch S) is removed, the gear position detection resistor is no longer connected in parallel to the voltage dividing resistor 55, so the reference voltage V1
indicates the largest value. Therefore, the vehicle speed limit value is lowered, and modifications to remove the vehicle speed limit can be prevented.

Further, when the battery 13 is removed and the voltage of the battery drops below a predetermined value, an ignition signal is given from the battery abnormality detection circuit 17 to the thyristor 27, and the ignition operation is similarly blocked. In this case, by appropriately setting the values of the resistor 17b and the capacitor 17c, the thyristor is connected from the capacitor 17c via the diode 17f only when the engine speed increases to a certain extent and the output of the exciter coil 4 becomes sufficiently high. 27 is adapted to receive an ignition signal. With this setting, even if the battery voltage is below a predetermined value, it will be possible to drive as long as the speed is below the predetermined speed, so you will not be unable to drive if the battery gets too high. .

Next, FIG. 6 shows the main part of another embodiment of the present invention. In this embodiment, the cathode of a thyristor 202 is grounded via a diode 60, and a capacitor 31 is connected between the gate and cathode of the thyristor 202. are connected in parallel. Thyristor 202
The anode of the Zener diode 35 is connected to the gate of the resistor 32, and the resistor 32 is connected between the cathode of the Zener diode 35 and the cathode of the thyristor 202.
is connected. The cathode of a diode 61 is connected to the anode of the thyristor 202, and the cathode of a diode 62 whose anode is grounded is connected to the anode of the diode 61. The rest of the structure is the same as the embodiment shown in FIG.

In the embodiment shown in FIG. 6, when a negative voltage is induced in the exciter coil 4, a current flows from the exciter coil 4 through the diode 62, the resistor 32, and the diode 36, and as this current increases, the resistor 3
When the voltage across the thyristor 202 exceeds the set value, the Zener diode 35 becomes conductive and provides a firing signal to the thyristor 202. As a result, the thyristor 202
conducts, the capacitor 201 is discharged, and an ignition operation is performed. When the thyristor 202 becomes conductive,
The negative voltage of the exciter coil 4 is short-circuited by the diodes 62, 61, the thyristor 202, and the diode 36. That is, in this example,
The diodes 62 and 61, the thyristor 202, and the diode 36 constitute a short circuit that short-circuits the negative voltage of the exciter coil 4.

In each of the above embodiments, a resistor 5 is connected between the input side of the constant voltage control circuit 15 and the anode of the diode 56.
7 is connected to give a firing signal to the thyristor 27, but as shown in FIG. You may also give Further, in the embodiment shown in FIG. 5, the ignition energy storage capacitor 201 is connected to the charging control circuit 8 via the diode 203, but when the thyristor 21 is used as the switch element of the charging control circuit 8, Alternatively, the diode 203 may be omitted and the ignition energy storage capacitor 201 may be directly connected to the cathode of the ignition energy supply control thyristor 21 as shown in FIG.

In each of the embodiments described above, the integrating circuit 6 and the reference voltage generating circuit 5 are powered from the battery 13, but as shown in FIG.
A capacitor 83 is connected to both ends of the capacitor 83 via a diode 81 and a resistor 82, and the capacitor 83 is charged with the output of the exciter coil 4.
By adding the voltage to the constant voltage control circuit 15 and making it a constant voltage, the integrating circuit 6 and the reference voltage generating circuit 5
It is also possible to obtain a constant voltage to be applied to.

FIG. 9 shows a modification of the battery abnormality detection circuit 17. In this example, the constant voltage control circuit 11
A series circuit of resistors 17g and 17h is connected between the output terminals of the transistor 5, and the base of the transistor 17e is connected to the connection point between the resistors 17g and 17h. Also, the cathode of the diode 17a is connected to the resistor 17.
A capacitor 17c is connected in parallel to both ends of the resistor 17i via a resistor 17j. The operation of this battery abnormality detection circuit is similar to that of the previous embodiment.

For vehicles that are not equipped with a battery (when the control circuit is driven by the output of the exciter coil)
Of course, there is no need to provide a battery abnormality detection circuit.

[Effects of the Invention] As described above, according to the present invention, an integrating circuit and a reference voltage generating circuit that generates reference voltages of different magnitudes depending on the gear selection position of the transmission are provided, and the output of the integrating circuit is adjusted. The vehicle speed is detected by comparing it with a reference voltage, and when the vehicle speed reaches the set value regardless of the selected gear position of the transmission, one half cycle of the output of the exciter coil (ignition energy is supplied Since the terminal voltage of the integrating capacitor is made equal to the reference voltage at the rising edge of the half cycle, there is an advantage that the vehicle speed can be limited to a certain value or less regardless of the gear selection position of the transmission. Also, if the vehicle speed exceeds the set value, the engine ignition will be stopped.
It is possible to reliably reduce the vehicle speed and ensure reliable operation. Further, according to the present invention, the ignition operation is stopped when the reference voltage that determines the set speed is below the set level, and the vehicle speed is limited to the lowest limit value or less when the gear position sensor is disconnected. Therefore, it is possible to prevent the user from modifying the circuit so that the vehicle speed limiting circuit does not work, and it is possible to improve safety.

In addition, in order to keep the vehicle speed limit constant regardless of the gear selection position, multiple integral circuit capacitors are prepared as a method to change the engine speed limit depending on the gear selection position. In this case, it is conceivable to select one of the capacitors depending on the selected position of the gear and perform the integration operation using the selected capacitor. However, in the case of such a configuration, it is necessary to prepare a large number of expensive capacitors, so that an increase in cost cannot be avoided. In addition, in order to keep the vehicle speed limit constant regardless of the selected gear position, it is necessary to set the limit value of the engine rotation speed at each selected gear position to some extent, and the limit value is set using a capacitor. In the case of switching, it is necessary to prepare a capacitor having a predetermined capacitance for each gear position. However, there are not so many types of capacitances on the market, and it is difficult to adjust the capacitance of each capacitor exactly as calculated. Therefore, the capacitor is used to switch the limit value of the engine speed according to the selected gear position. In this case, circuit design inevitably becomes difficult.

In contrast, in the present invention, a gear position detection resistor is selected according to the gear position, and the selected gear position detection resistor is connected in parallel to a voltage dividing resistor to switch the reference voltage and adjust the engine rotation speed. Since the limit value is switched, the cost can be reduced compared to the case where the capacitors are switched.

In addition, since resistors with slightly different resistance values can be easily obtained, it is easy to set the reference voltage corresponding to each gear position, and the vehicle speed limit value remains constant regardless of the gear position. This has the advantage of making it easy to design a circuit for

[Brief explanation of drawings]

FIG. 1 is a block diagram schematically showing the electrical configuration of the ignition device of the present invention, FIG. 2 is a block diagram showing an example of the configuration of the ignition circuit, and FIGS. 3 and 4 are the same as those shown in FIG. FIG. 5 is an operational waveform diagram illustrating the operation of the present invention when the ignition circuit shown in FIG. 2 is used in the configuration, FIG. 5 is a circuit diagram showing an embodiment of the present invention embodying the configuration of FIG. 9 to 9 are circuit diagrams showing the configuration of essential parts of other different embodiments of the present invention. 1...Ignition coil, 2...Primary current control circuit,
201...Ignition energy storage capacitor, 2
02...Thyristor for discharge control, 3...Ignition circuit, 4...Exciter coil, 5...Reference voltage generation circuit, 6...Integrator circuit, 7...Comparison circuit, 9...
...signal supply circuit, 10...exciter short circuit,
12...Setting speed abnormality detection circuit.

Claims (1)

[Scope of Claims] 1. An ignition circuit consisting of an ignition coil and a primary current control circuit that controls the primary current of the ignition coil to suddenly change at the ignition timing of the internal combustion engine, and an ignition circuit that is driven by the internal combustion engine that drives the vehicle. An ignition device for an internal combustion engine, comprising: an exciter coil disposed in a magnet generator, which induces an alternating current voltage in synchronization with the rotation of the engine, and provides ignition energy to the ignition circuit in one half cycle of the alternating voltage. , preventing ignition energy from being supplied from the exciter coil to the ignition circuit when a trigger signal is applied at the rising edge of the one half cycle of the output of the exciter coil; an ignition energy supply control circuit that allows ignition energy to be supplied from the exciter coil to the ignition circuit when the exciter coil is not being applied; a reference voltage generation circuit that generates a reference voltage of a different magnitude depending on the selected gear position of a transmission having a plurality of gear positions selected at the time; and a rise of the one half cycle of the output of the exciter coil. The engine performs an integral operation in synchronization with the rotation of the engine to charge an integral capacitor at a constant time constant from a first constant angle position where the phase is ahead of the starting position to a second constant angle position where the phase is behind the rising position. an integrating circuit that performs the operation once per rotation of the integrating capacitor; and a terminal voltage of the integrating capacitor is compared with the reference voltage, and when the terminal voltage of the integrating capacitor is equal to or lower than the reference voltage, the trigger is applied to the ignition energy supply control circuit. a comparison circuit that provides a signal; and a set speed abnormality detection circuit that detects the reference voltage and provides the trigger signal to the ignition energy supply control circuit when the reference voltage is below a set level, The circuit includes a resistor voltage divider circuit consisting of a voltage divider resistor and a series resistor connected in series with the voltage divider resistor, to which a constant DC voltage is applied to both ends;
It consists of a plurality of gear position detection resistors and a changeover switch that connects a resistor selected from the plurality of gear position detection resistors in parallel to the voltage dividing resistor according to the selected gear position of the transmission. a gear position sensor, configured to generate the reference voltage across the voltage dividing resistor, regardless of the selected gear position of the transmission;
The voltage dividing resistor, the series resistor, and the gear position detection are configured to make the terminal voltage of the integrating capacitor equal to the reference voltage at the rising edge of the one half cycle of the output of the exciter coil when the speed of the vehicle reaches the set value. An ignition device for an internal combustion engine with a vehicle speed limiting circuit, characterized in that a resistance value of a resistor is set.