JPH0422064Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] 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 for a period exceeds a preset value. Ignition devices for internal combustion engines are known. In a conventional ignition system of this kind, the engine rotation speed is detected from the output of the magnet generator, and the engine is caused to misfire when the detected rotation speed reaches a set value.

[Problems to be Solved by the Invention] However, the above system has a problem in that the speed limit varies depending on the gear selection position of the transmission.

In addition, in conventional devices, when detecting the engine rotation speed from the output of the magnet generator, the output frequency of the magnet generator is converted into a voltage signal using a frequency-voltage conversion circuit, which is proportional to the engine rotation speed. However, frequency-to-voltage conversion circuits are generally equipped with a smoothing circuit that acts as a delay element, and there is a certain delay time between when the engine rotational speed fluctuates and when the fluctuation is actually detected. , the engine speed cannot be detected in real time to limit the vehicle speed, and the engine misfires according to the detected rotational speed a certain period of time ago. A decision will be made as to whether or not.

In this way, when detecting rotational speed using a frequency-voltage conversion circuit, there is a delay in response, which can cause the engine to misfire even though the vehicle speed has actually fallen below the speed limit. There was a problem in that the engine did not misfire even when the speed limit was exceeded, and the speed fluctuated greatly while driving at the speed limit, resulting in poor driving feeling.

The purpose 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 determine in real time whether the vehicle speed exceeds the speed limit. An object of the present invention is to provide an ignition device for an internal combustion engine with a vehicle speed limiting circuit that can accurately perform a vehicle speed limiting operation.

[Means for Solving the Problems] As shown in FIG. 1, the present invention suddenly changes the primary current flowing through the ignition coil 1 and the primary coil 1a of the ignition coil when an ignition signal is applied. an ignition circuit 3 consisting of a primary current control circuit 2 that controls the current, and an ignition circuit 3 that is arranged in a magnet generator driven by the internal combustion engine that drives the vehicle to induce an alternating current voltage in synchronization with the rotation of the engine. an exciter coil 4 that applies ignition energy to the ignition circuit in one half cycle of the ignition circuit, and a short circuit that short-circuits the exciter coil when the output of the other half cycle of the exciter coil exceeds a set value. The ignition device for an internal combustion engine according to the present invention is provided with a reference voltage generation circuit 5, an integration circuit 6, a comparison circuit 7, and an ignition energy supply control circuit 8.

The reference voltage generating circuit 5 is composed of a circuit that generates a reference voltage _V1 of a different magnitude depending on the selected position of a gear of a transmission disposed between the internal combustion engine and the drive shaft of the vehicle.

The integrating circuit 6 includes an integrating capacitor that is charged with a fixed time constant by a fixed DC voltage, a reset switch that discharges the charge of the integrating capacitor when it becomes conductive, and a switch that is connected to both ends of the exciter coil. and a reset switch control circuit that turns on the reset switch when a half-cycle output is present.

The comparator circuit 7 compares the voltage V ₂ obtained across the integrating capacitor in the process of charging the integrating capacitor.
Compare the instantaneous value of and the value of the reference voltage V ₁ , and the instantaneous value of the voltage V ₂ across the integrating capacitor is the reference voltage.
The voltage across the integrating capacitor produces a first level output when V is below the value of ₁ .
A second level output is generated when the instantaneous value of V ₂ is greater than or equal to the reference voltage V ₁ .

The ignition energy supply control circuit 8 includes a comparison circuit 7
The comparison circuit 7 is controlled by the output of the exciter coil 4 at the rising edge of one half cycle of the output of the exciter coil 4.
ignition energy is prevented from being supplied to the ignition circuit when the exciter coil is producing a first level output, and at the rising edge of one half cycle of the output of the exciter coil, the comparator circuit
Allows ignition energy to be supplied from the exciter coil to the ignition circuit when generating an output level of .

When the speed of the vehicle reaches a set value, the reference voltage generating circuit 5 generates a voltage across the integrating capacitor at the rising edge of one half cycle of the output of the exciter coil, regardless of the selected gear position of the transmission.
It is configured to generate a different reference voltage V _{1 depending on the selected gear position of the transmission so that the instantaneous value of V 2 is} equal to the value of the reference voltage V ₁ .

Note that P is a spark plug attached to a cylinder of an engine (not shown) and connected to a secondary coil of an ignition coil.

[Function] In the above configuration, if the speed of the vehicle is below the set value, the terminal voltage of the integrating capacitor will exceed the reference voltage at the rising edge of one half cycle of the exciter coil, regardless of the gear selection position of the transmission. Therefore, the output of the comparator circuit 7 is
has reached the level of At this time, since the ignition energy supply control circuit 8 allows ignition energy to be supplied from the exciter coil to the ignition circuit,
Ignition energy is supplied to the ignition circuit each time one half-cycle output of the exciter coil occurs. Therefore, in this case, the ignition operation is performed normally. When the speed of the vehicle exceeds the set value and the output of one half cycle of the exciter coil occurs, the instantaneous value of the voltage _V2 across the integrating capacitor is smaller than the value of the reference voltage _V1 , so the comparator circuit 7 The output of is at the first level. At this time, the ignition energy supply control circuit blocks the supply of ignition energy and stops the ignition operation. The engine will therefore misfire and its rotational speed will drop, causing the vehicle's speed to fall below the set value.

When the engine rotational speed falls below the set value, the ignition energy supply control circuit allows ignition energy to be supplied again, so the ignition operation is performed normally, and by repeating these operations, the speed of the engine vehicle increases. Limited to below the set value.

In the above device, the reference voltage generation circuit 5,
The integration circuit 6 and the comparison circuit 7 constitute a vehicle speed detection circuit 9 that detects the speed of the vehicle, and the vehicle speed detection circuit 9 and the ignition energy supply control circuit 8 constitute a vehicle speed limiting circuit.

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.
A discharge control thyristor 203 is connected in parallel to both ends of the series circuit of the thyristor 202 and the primary coil 1a, and its cathode is grounded.The cathode 203 is connected to the connection point between the anode of the thyristor 202 and the capacitor 201, and the anode receives ignition energy. Supply control circuit 8
A diode is connected to the non-grounded terminal of the exciter coil 4 through the exciter coil 4. Exciter coil 4
is located in a four-pole magnet generator that is driven in synchronization with the rotation of the internal combustion engine that drives the vehicle.
Induces an alternating voltage of 2 cycles per revolution. The capacitor 201 operates when the ignition energy supply control circuit 8 allows the supply of ignition energy.
The exciter coil 4 is charged to one polarity by the output voltage of one half cycle in the direction of the solid arrow shown in the figure (hereinafter referred to as positive direction voltage). 10 is the output voltage of the exciter coil 4 in the other half cycle in the direction of the dashed arrow shown in the figure (hereinafter referred to as negative direction voltage). 11 is an exciter coil that short-circuits the exciter coil 4 after the ignition signal is supplied to the thyristor 202 in order to protect the components of the signal supply circuit 9 from excessive voltage. It is a short circuit. This short circuit 1
1 consists of a switch element that short-circuits the exciter coil 4, and a trigger circuit that triggers the switch element after a firing signal is applied to the thyristor 201.

Figures 3 and 4 show the output voltage V _{e and} the integral of the exciter coil 4 when the exciter coil 4 is arranged in a four-pole magnet generator using a capacitor discharge type ignition circuit as shown in Figure 2. Figure 3 shows the waveforms of the voltage V ₂ across the integrating capacitor of circuit 6, the reference voltage V ₁ and the terminal voltage V _c of the capacitor 201. Figure 3 shows the waveforms of the voltage V 2 across the integrating capacitor in circuit 6, and the terminal voltage V c of the capacitor 201. FIG. 4 shows a case where the rotational speed of the engine exceeds a set value.

When the rotational speed of the engine is below the set value, the instantaneous value of the voltage V ₂ across the integrating capacitor of the integrating circuit 6 at the angle θ ₁ at which the positive voltage V _e of the exciter coil 4 in the direction of the solid arrow in the figure rises. is greater than or equal to the reference voltage V ₁ , the output of the comparison circuit 7 is at the second level and the ignition energy supply control circuit 8 does not prevent the capacitor 201 from charging.
Therefore, at this time, the capacitor 201 is charged by the positive voltage _V11 of the exciter coil 4 (the output of the positive half cycle in FIG. 3A). This charging current causes a phase delay in the voltage V _e of the exciter coil 4, and the output voltage V _e of the exciter coil 4 rapidly falls when charging of the capacitor 201 is completed at an angle θ ₂ . Exciter coil 4 at angle θ ₂
When the negative direction voltage V ₂₁ rises, an ignition signal is applied from the exciter coil 4 to the thyristor 202 through the signal supply circuit 10 almost at the same time. 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. Thyristor 20
After the ignition signal is applied to the exciter coil 2, when the negative direction output of the exciter coil 4 exceeds the set value at an angle θ ₃ , the switch element of the exciter shorting circuit 11 becomes conductive and short-circuits the output of the exciter coil 4.

Then, at an angle θ ₄ , the exciter coil 4
When the second positive direction voltage V ₁₂ is output, the instantaneous value of the voltage V ₂ across the capacitor of the integrating circuit 6 is greater than or equal to the reference voltage V ₁ , so the capacitor 201 is charged in the same way as above. Ru. When charging of the capacitor 201 is completed at the angle θ5, the terminal voltage V ₁₂ of the exciter coil 4 quickly becomes zero, and the negative direction voltage V ₂₂ 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. Then, at an angle θ ₆ , the exciter coil 4
When the negative voltage reaches a predetermined value, the shorting 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 an angle θ ₂ becomes a regular ignition spark, and the spark generated at the spark plug at an angle θ ₅ becomes a waste spark. In addition, if the internal combustion engine has two cylinders, the spark generated at the angle θ ₂ is the first spark.
The spark generated at the angle θ ₅ becomes the normal ignition spark for the second cylinder.

As shown in FIG. 4, after the capacitor 201 is charged at an angle θ ₁₁ and the ignition operation is performed at an angle θ 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, when the positive direction voltage V ₁₂ of the exciter coil rises at the angle θ ₁₄ , the capacitor of the integrating circuit 6 is The instantaneous value of the voltage V ₂ at both ends is still lower than the magnitude of the reference voltage (which is set to a different value depending on the gear selection position of the transmission) V ₁ ) as the rotational speed increases. (The capacitor will not be charged in time). Therefore, at this time, the output of the comparison circuit 7 is at the first level, and the ignition energy supply control circuit 8 prevents the capacitor 201 from being charged. At this time, the load on the exciter coil 4 is only the electronic components of the control circuit, and the positive direction output voltage waveform of the exciter coil 4 that rises at an angle θ ₁₄ becomes close to the waveform under no load.
When the negative direction voltage V ₂₁ of the exciter coil 4 rises at an angle θ ₁₅ , a firing 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. Short circuit 11 then operates at angle θ ₁₆ to short circuit exciter coil 4 . Next, the positive direction voltage V ₁₁ of the exciter coil 4 rises at an angle θ ₁₇ , but at this time the voltage V ₂ across the capacitor of the integrating circuit 6 is still equal to the reference voltage V ₁
Since it is lower, the output of the comparison circuit 7 is at the first level and the ignition energy supply control circuit 8 prevents the capacitor 201 from charging. Therefore, even if the negative direction voltage V ₂₁ of the exciter coil rises at the angle θ 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 rotational speed exceeds the set value set according to the gear selection position of the transmission, ignition energy is supplied to the ignition circuit 3. As a result, the ignition operation is prevented, the rotational speed of the engine is reduced, and the speed of the vehicle is limited to a set value or less. In this case, the reference voltage generating circuit 5 sets the terminal voltage of the integrating capacitor to the reference voltage at the rising edge of the positive direction output of the exciter coil 4 when the speed of the vehicle reaches the 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 so as to be equal, the speed of the vehicle can be limited to a certain speed or less regardless of the gear selection position of the transmission.

As is clear from the above explanation, in this invention,
The integrator circuit is reset each time the exciter coil generates a negative output (output of the other half cycle), and the output of the integrator circuit is reset each time the exciter coil generates a positive output (output of the other half cycle). The magnitude relationship between the instantaneous voltage value and the reference voltage is determined to check whether the rotational speed exceeds the set speed. With this configuration, each time the engine rotates, it is checked whether the engine speed exceeds the set speed before starting the ignition operation, so that each instantaneous vehicle speed is equal to the current speed limit. It is possible to determine in real time whether or not the speed exceeds the limit, and immediately determine whether or not to cause the engine to misfire, thereby eliminating response delay and performing appropriate vehicle speed limiting operations. Therefore, it is possible to reduce speed fluctuations when the vehicle is running near the speed limit and improve the running feeling.

[Embodiment] An embodiment 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 the anode of 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 key 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 an end of the capacitor 31 connected to the gate of the thyristor 202. Thyristor 20
A resistor 32 connected between the cathode of the resistor 32 and the cathode of the thyristor 3; a thyristor 33 connected in parallel to both ends of the resistor 32 with the anode facing the ground side;
It consists of a Zener diode 35 connected between the gate anodes of 3 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. has been done.

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 cathode is connected to the base of the transistor 42, the base of the transistor 42, the collector of the transistor 42, and the transistor 41.
It consists of resistors 44, 45, and 46, each having one end connected to the collector of the transistor and the other end commonly connected, and a diode 48 whose anode is connected to the base of the transistor 42 via a resistor 47, and the cathode of the diode 48 is connected to the exciter. It is connected to the non-grounded side terminal of the coil 4. Resistors 44, 45 and 4
The common connection point of 6 is connected to the non-grounded output terminal of a constant voltage power supply circuit 50, and the output of a battery 53 is applied between the input terminals of the power supply circuit 50 via a diode 51 and a power switch 52.

In this example, the transistor 41 constitutes a reset switch that discharges the integrating capacitor 40, and the transistor 42, the diodes 43 and 48, and the resistor 47 constitute the exciter coil 4.
A reset switch control circuit is constructed which makes the reset switch (transistor 41) conductive while a negative half-cycle voltage appears across both ends of the circuit.

The reference voltage generation circuit 5 includes resistors 54 and 55 connected in parallel between the output terminals of the constant voltage power supply circuit 50.
It consists of a series circuit of , resistors R1 to R3, and a gear selection position detection changeover switch S that selects the resistors R1 to R3 in conjunction with gear selection means (for example, a change lever) of the transmission. Changeover switch S
consists of a movable contact S _a and fixed contacts A ₁ to A ₅ that the movable contact Sa contacts in sequence, and when the switching lever of the transmission (not shown) is in the neutral position, the movable contact S _a contacts the fixed contact A ₁ . However, when the lever is in the first to third speed positions, it comes into contact with the fixed contact _A2 . Further, when the switching lever is in the fourth speed and fifth speed positions, the movable contact S _a comes into contact with the fixed contacts A ₄ and A ₅ , respectively. In this example, contact _A6 is an idle contact. One ends of the resistors R ₁ to R ₃ are commonly connected to the connection point of the resistors 54 and 55, and the other ends are grounded through fixed contacts A ₂ to A ₄ of the changeover switch S, respectively. Therefore, when the switching lever of the transmission is in the first to third speed positions, the movable contact S _a contacts the fixed contact A ₂ and connects the resistor R ₁ to the resistor 55 in parallel. Furthermore, when the transmission switching lever is in the 4th and 5th speed positions, the movable contact S _a contacts the fixed contacts A ₄ and A _5, respectively, and this causes resistance.
R ₂ and R ₃ are connected in parallel to both ends of the resistor 55. Therefore, the reference voltage V ₁ appearing across the resistor 55 differs depending on the gear selection position of the transmission, and when the transmission is in the first to third gear positions, when the transmission is in the fourth gear position, and when the transmission is in the fourth gear position and The values of the reference voltage V ₁ when in the 5th gear position are respectively V _1a to
Assuming V _1c , there is a relationship of V _1a > V _1b > V _1c . Here, the value of V _1a is set so that 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 when the vehicle speed reaches the set value with the transmission in the third gear position. V _1b and V _1c are set 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 voltage is set to be equal to the terminal voltage of the integrating circuit capacitor. In this example, the reference voltage is
Although V ₁ is kept constant, it goes without saying that a different reference voltage may be generated for each shift position.

The reference voltage V ₁ is the integrating capacitor 4 of the integrating circuit 6.
It is input to the comparator circuit 7 together with the terminal voltage V ₂ of 0,
The output terminal of the comparator circuit 7 is connected to the gate of the thyristor 27 via a diode 56. The output terminal of the comparison circuit 7 is also connected to the cathode of the diode 51 via a resistor 57. The output of the comparator circuit 7 indicates that the engine rotational speed exceeds the set speed set according to the selected position of the transmission, and V ₂
It is at a high level (first level) when <V ₁ ,
At this time, an ignition signal is applied from the battery 53 to the thyristor 27 via the switch 52, the diode 51, the resistor 57, and the diode 56. Further, when the rotational speed of the engine is below the set speed set according to the selected position of the transmission and V ₂ ≧ V ₁ , the output of the comparator circuit 7 is at the ground level (second level),
At this time, the supply of the ignition signal to the thyristor 27 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 53 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 integrating capacitor 40 is charged by the output of the constant voltage power supply circuit 50 at a constant time constant. When a negative voltage is induced in the exciter coil 4, a current flows from the exciter coil 4 through the diode 43, the resistor 47, and the diode 48, and the base-emitter of the transistor 42 is reverse biased due to the forward voltage drop of the diode 43. Therefore, almost at the same time when the negative voltage of the exciter coil 4 rises, the transistor 42 is cut off, and the transistor 4
1 becomes conductive. This allows capacitor 40
The charge is discharged almost instantaneously through transistor 41, and integration circuit 6 is reset. Next, by the operation described later, the thyristor 33 of the signal supply circuit 5
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 the capacitor 40
charging starts. Therefore, in the integrating circuit 6, when the negative voltage of the exciter coil 4 rises, the capacitor 40 is discharged, and when the negative voltage of the exciter coil 4 is short-circuited, the capacitor 40 is discharged.
0 charging starts.

In the device shown in FIG. 5, when a positive voltage (voltage in the direction of the solid arrow 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, a current flows from the exciter coil 4 through the thyristor 21, the diode 22, the capacitor 201, the diode 204, and the primary coil 1a, and the capacitor 201 is charged. If the engine rotational speed is below the set value, the instantaneous value of the voltage _V2 across the integrating capacitor 40 has exceeded the reference voltage V1 at the time when the positive direction voltage of the exciter coil ₄ is generated. , the output of the comparison circuit 7 is at ground level, 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 (voltage in the opposite direction to the arrow in the figure) is generated in the exciter coil 4, a current flows from the exciter coil 4 through the resistor 30, capacitor 31, and diode 36, and the capacitor 31 is charged. As capacitor 31 is charged, resistor 3
When the voltage across 2 reaches a predetermined value, the Zener diode 35 becomes conductive, and the thyristor 33
An ignition signal is supplied to the ignition signal. 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, and the capacitor 201 becomes the thyristor 202.
and the primary coil 1a. This causes a large magnetic flux change in the iron core of the ignition coil,
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 5. That is, in this embodiment, the thyristor 33
and the diode 36 constitute the 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 that the transistor 42 becomes conductive and the transistor 41 becomes cut off. Therefore, when the thyristor 33 becomes conductive and the negative voltage of the exciter coil 4 is short-circuited, charging of the integrating capacitor 40 is started.

When the rotational speed of the engine 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 voltage across the integration capacitor 40 decreases.
Since the instantaneous value of V ₂ has not reached the magnitude of the reference voltage V ₁ , the output of the comparator circuit 7 is at a high level. Therefore, at this time, an ignition signal is applied from the battery 53 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, thyristor 21 is not conductive and capacitor 201 is not charged. 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.

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, 61, the thyristor 202, and the diode 36 constitute a short circuit that short-circuits the exciter coil when the negative voltage of the exciter coil 4 reaches a set value.

In each of the above embodiments, a resistor 5 is connected between the input side of the constant voltage power supply circuit 50 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 53, 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 applying the voltage to the constant voltage power supply circuit 50 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.

[Effects of the invention] As described above, according to the invention, there is an integral circuit that is reset every time the exciter coil generates the output of the other half cycle, and the integration circuit that is reset every time the exciter coil generates the output of the other half cycle, and the integrated circuit that can be used in the vehicle regardless of the selected gear position of the transmission. When the speed of the exciter coil reaches the set value, the instantaneous value of the voltage across the integrating capacitor at the rise of one half cycle of the output of the exciter coil (the half cycle that supplies ignition energy) is made equal to the magnitude of the reference voltage. A reference voltage generation circuit is provided that generates reference voltages of different magnitudes depending on the gear selection position of the transmission, and the vehicle speed is detected by comparing the instantaneous value of the output voltage of the integrating circuit with the magnitude of the reference voltage. Since the ignition operation of the engine is stopped when the vehicle speed exceeds a set value, 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.

In particular, in the present invention, the integrator circuit is reset each time the exciter coil generates the output of the other half cycle, and the output voltage of the integrator circuit and the reference voltage are reset each time the exciter coil generates the output of the other half cycle. Since the engine speed is checked each time the engine rotates, prior to ignition operation, it is possible to determine whether the vehicle speed at each moment exceeds the speed limit at that time. This can be done in real time to immediately make a decision as to whether or not to cause the engine to misfire, thereby eliminating response delays and allowing appropriate vehicle speed limiting operations to be performed. Therefore, there is an advantage that speed fluctuations when the vehicle is running near the speed limit can be reduced and the running feeling can be improved.

[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 Fig. 1. An operation 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. 1, and FIG. 8 through 8 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.

Claims (1)

[Claims for Utility Model Registration] An ignition coil and a device for controlling the primary current of the ignition coil to suddenly change when an ignition signal is applied.
The ignition circuit is arranged in a magnet generator driven by the internal combustion engine that drives the vehicle, and induces an alternating voltage in synchronization with the rotation of the period, and in one half cycle of the alternating voltage. an exciter coil that provides ignition energy to the ignition circuit;
An ignition device for an internal combustion engine, comprising: a short circuit that shorts the exciter coil when the output of the other half cycle of the exciter coil exceeds a set value, the ignition device comprising: a short circuit between the internal combustion engine and the drive shaft of the vehicle; a reference voltage generation circuit that generates a predetermined reference voltage according to the selected position of the gear of the transmission, which is arranged in A reset switch provided to discharge the charge of the capacitor, and a reset switch control circuit that conducts the reset switch when the output of the other half cycle appears at both ends of the exciter coil. an integrating circuit, which compares the instantaneous value of the voltage obtained across the integrating capacitor in the process of charging the integrating capacitor with the value of the reference voltage, so that the voltage across the integrating capacitor becomes the value of the reference voltage; a comparator circuit that generates a first level output when the voltage is lower than the reference voltage, and generates a second level output when the voltage across the integrating capacitor is equal to or higher than a reference voltage; Ignition energy is supplied from the exciter coil to the ignition circuit when the comparator circuit is generating the output at the first level at the rising edge of the one half cycle of the output of the exciter coil under the control of the output. ignition energy is supplied from the exciter coil to the ignition circuit when the comparator circuit is generating an output at a second level at the rising edge of the one half cycle of the output of the exciter coil. and an ignition energy supply control circuit that allows the output of the exciter coil to increase when the speed of the vehicle reaches a set value, regardless of the selected gear position of the transmission. to generate reference voltages of different magnitudes depending on the selected gear position of the transmission so that the instantaneous value of the voltage across the integrating capacitor at the rise of the one half cycle of is made equal to the value of the reference voltage; An ignition device for an internal combustion engine with a vehicle speed limiting circuit, characterized in that: