JPH08100752A - Non-contact ignition device of internal combustion engine - Google Patents

Abstract

PURPOSE: To enable any overrotational speed of an internal combustion engine or running of a vehicle with its speed exceeding its set level to be prevented by misfire control or ignition timing control of the internal combustion engine in compliance with an output signal of a switch means operated at such an overrotation of the engine and/or an overspeed of the vehicle. CONSTITUTION: Such units are provided as a switch means 26 which is set ON for a specified time when the rotational speed of an internal combustion engine or the speed of a vehicle load with the internal combustion engine exceeds each set value and charges a first condenser serially connected to a power generation coil 1, and a third switching element 18 which keeps its on condition at the discharge time constant of a time constant circuit including a first condenser after OFF setting of the switch means 26. Additionally, electric power supply to a charge/discharge condenser 3 for ignition is restricted by the second switching element 23 serially connected to the electric power generation coil 1 during ON condition of the third switching element 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention controls the ignition current supply timing to an ignition coil by detecting that the speed of a vehicle or the number of revolutions of an internal combustion engine exceeds a set value to prevent the internal combustion engine from overheating. The present invention relates to a contactless ignition device that prevents rotation.

[0002]

2. Description of the Related Art Conventionally, a governor means having a mechanical speed control function has been widely used as an ignition device for preventing an excessive rotation of an internal combustion engine. This is to temporarily restrict the operation of the ignition circuit by opening a switch or the like by centrifugal force when the rotation speed of the internal combustion engine exceeds a set value.

[0003]

However, in such a conventional ignition device using the governor means, it is necessary to prepare a sufficient working space for installing the governor means, and in addition to the switch opening / closing mechanism as a whole. However, there was a problem that the mechanical life of the machine was extremely short.

On the other hand, on the other hand, various proposals have been made for electrically preventing the excessive rotation according to the operation of the vehicle speed warning light operating switch and the internal combustion engine excessive rotation detecting switch. The problem is that the circuit configuration for detecting the operation signal of each switch and the circuit configuration for limiting or delaying the current supply to the ignition circuit for preventing over-rotation become complicated and expensive. was there.

The invention of claim 1 has been made to solve the above-mentioned problems, and according to the output signal of the switch means which operates when the internal combustion engine is over-rotating or when the vehicle is running at a speed exceeding the set speed, An object of the present invention is to provide a non-contact ignition device for an internal combustion engine, which can avoid the above-mentioned over-rotation and traveling exceeding a set speed by misfire control or ignition timing control of the internal combustion engine and realize this at a low cost with a simple system.

Further, the invention of claim 2 sets the trigger timing of the first switching element triggered by the trigger coil by the output of the switch means which operates when the internal combustion engine is over-rotating or when the vehicle is traveling at a speed exceeding the set speed, An object of the present invention is to provide a non-contact ignition device for an internal combustion engine, which is capable of avoiding the above-mentioned over-rotation and traveling exceeding a set speed with a simple and low-cost configuration by delaying with a time constant circuit including a capacitor.

A third object of the present invention is to provide a non-contact ignition device for an internal combustion engine, which can easily control the misfire or the ignition timing of the internal combustion engine by using the operation signal of the operation switch for the speed warning light of the vehicle. And

Further, an object of the present invention is to provide a non-contact ignition device for an internal combustion engine, which can easily perform misfire control or ignition timing control of the internal combustion engine by using an operation signal of a rotation speed detection switch of the internal combustion engine. And

[0009]

A contactless ignition system for an internal combustion engine according to a first aspect of the present invention is turned on for a predetermined time when the rotational speed of the internal combustion engine or the speed of a vehicle equipped with the internal combustion engine exceeds a set value. The switch means for charging the first capacitor connected in series to the power generation coil and the discharge time constant of the time constant circuit including the first capacitor after the switch means is turned off are kept in the ON state. A third switching element is provided, and the second switching element connected in series to the generator coil limits the power supply to the ignition charge / discharge capacitor while the ON state of the third switching element is maintained. It was done like this.

A non-contact ignition device for an internal combustion engine according to a second aspect of the present invention is turned on for a predetermined time when the rotational speed of the internal combustion engine or the speed of a vehicle equipped with the internal combustion engine exceeds a set value, and the trigger coil is turned on. Switch means for charging the first capacitor directly connected, and a third switching element for holding an on state by a discharge time constant of a time constant circuit including the first capacitor after the switch means is turned off. A fourth switching element connected in series to the trigger coil via a second capacitor, holds the ON state of the third switching element, and charges the first switching element while the second capacitor is being charged. The trigger of is regulated.

In the non-contact ignition device for an internal combustion engine according to a third aspect of the present invention, the switch means is an operation switch for a vehicle speed warning light.

In the non-contact ignition device for an internal combustion engine according to a fourth aspect of the present invention, the switch means is a switch for detecting the rotational speed of the internal combustion engine.

[0013]

In the non-contact ignition device for an internal combustion engine according to the present invention, the second switching element of the misfire control circuit connected in series to the generator coil is set when the switch means is conducted for a very short time. By setting the conductive state for a set time, the charge of the ignition charge / discharge capacitor is prevented from being charged, and misfire control is performed to prevent an excessive rotation of the internal combustion engine or an excessive speed of the vehicle.

In the non-contact ignition device for an internal combustion engine according to the invention of claim 2, the fourth switching element of the ignition timing control circuit connected in series with the trigger coil is set when the switch means is conducted for a very short time. By making it conductive for a set time, the operation of the first switching element that controls the current supply to the ignition coil is delayed,
As a result, the ignition timing of the spark plug is delayed to prevent the internal combustion engine from over-rotating or the vehicle from over-speeding.

In the non-contact ignition device for an internal combustion engine according to a third aspect of the present invention, the vehicle speed warning operation switch is used as the switch means, so that the vehicle can easily run at an excessive speed above the set speed and the internal combustion engine. To prevent over rotation.

A contactless ignition system for an internal combustion engine according to a fourth aspect of the present invention is for detecting the number of revolutions which is turned on and off by the output of the number of revolutions detection circuit of the internal combustion engine used as a switch means in, for example, an operation control circuit of a vehicle. By using the switch operation signal, it is possible to easily prevent the vehicle from traveling at an excessive speed and the internal combustion engine from overspeeding.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, A is a non-contact ignition circuit, B is an ignition control circuit, and C is a holding circuit.

In the non-contact ignition circuit A, R is a rotor for generating electricity having magnetic poles, 1 is a generator coil for inducing an AC voltage by the rotation of the rotor R, and 2, 10 and 11 are rectifying the AC voltage. It is a diode.

Further, 3 is an ignition charging / discharging capacitor that charges the rectified DC voltage and discharges to the ignition coil 4 when a thyristor, which will be described later, is switched on. The power generation coil 1, the diode 2, the ignition charging / discharging capacitor. 3 and the primary coil 4a of the ignition coil 4 are connected in series.

Reference numeral 5 is a thyristor as a first switching element connected in parallel with the ignition coil 4 together with the diode 11, and 7 and 8 are resistors for setting the trigger level of the thyristor 5.

Further, 6 is a trigger coil for inducing a trigger voltage for the first thyristor 5 which induces a voltage by the rotation of the rotor R, and the resistor 7 is connected between the gate of the thyristor 5 and the trigger coil 6. ing. Reference numeral 9 is a rectifying diode. Reference numeral 4b is a secondary coil of the ignition coil 4, to which an ignition plug 25 is connected. Further, in the holding circuit C, 12 is a diode and 13
Is a resistor, 14 is a first capacitor, 15 is a diode,
Reference numeral 26 is an operation switch for speed warning lights, which is a switch means that conducts only for a short time when the vehicle reaches a set excess speed.
Are connected in series with.

Further, 16 and 17 are connected in series to each other, and are connected between the connection midpoint of the resistor 13 and the first capacitor 14 and the ground, and 18 is a PNP type as a third switching element. The emitter of the transistor is connected to the connection midpoint of the resistors 16 and 17, and the base is connected to the connection midpoint of the first capacitor 14 and the diode 15 via the resistor 20 and the diode 21.

Further, in the ignition control circuit B, 2
Reference numeral 3 is a thyristor as a second switching element connected in series to the magneto coil 1 via a resistor 22, and the gate of this thyristor 23 is connected to the collector of the transistor 18 via a resistor 19. 24 is a resistor connected between its gate and ground.

Next, the operation will be described. First, when the vehicle is traveling at a normal speed equal to or lower than the set excessive speed, the diode 2, the ignition charge / discharge capacitor 3 and the ignition coil 4 are driven by the positive induced voltage of the generator coil 1.
A current flows through the path of the primary coil 4a, and the charge / discharge capacitor 3 for ignition is charged with electric charge.

Then, when the positive induced voltage of the trigger coil 6 reaches a predetermined trigger level, the thyristor 5 as the first switching element is triggered and becomes conductive,
Therefore, the charge of the ignition charging / discharging capacitor 3 is supplied to the primary coil 4a of the ignition coil 4, a high voltage is generated in the secondary coil 4b, and spark ignition is performed by the ignition plug 25.

Next, when the speed of the vehicle becomes excessive speed (speed over the so-called set speed), the speed warning light operation switch 2 as the switch means.
6 will conduct only for a very short time.

Therefore, due to the positive induced voltage of the magneto coil 1, the diode 12, the resistor 13 and the first capacitor 1
4, diode 15 and operation switch 2 for speed warning light
6 path, diode 12, resistors 13, 16 and 1
7, the diode 12, the resistors 13, 16 and the emitter of the transistor 18 which is the third switching element.
Currents flow through the base, the resistor 20, the diodes 21, 15 and the path of the speed warning light operating switch 26, respectively.

As a result, in the first capacitor 14,
Electric charges are charged through the speed warning light actuation switch 26, and after the speed warning light actuation switch 26 is turned off,
The electric charge of the first capacitor 14 is discharged through the path of the resistor 16, the emitter / base of the transistor 18, the resistor 20 and the diode 21.

This discharge is caused by the capacitor 14 and the resistor 1.
The discharge time constant determined by 6 and 20 keeps transistor 18 conductive for a set time (eg, a few seconds).

Therefore, when a positive induced voltage is generated in the magneto coil 1, the diode 12, the resistors 13, 1
6, emitter / collector of transistor 18, resistance 1
9. A current flows through the gate / cathode of the thyristor 23, which is the second switching element, and the path of the resistor 24.

The thyristor 23, which is the second switching element, is used for the speed warning lamp operation switch 2
When the switch 6 is turned on, it is triggered and becomes conductive, and the resistor 22
Also, current flows through the anode / cathode path of the thyristor 23 and the path of the diode 2, the ignition charge / discharge capacitor 3 and the primary coil 4a of the ignition coil 4.

However, at this time, the electric charge charged in the ignition charging / discharging capacitor 3 cannot be charged sufficiently to be ignited by the ignition plug 25 due to the conduction of the thyristor 23.

Therefore, even if the thyristor 5, which is the first switching element, conducts at a predetermined ignition timing, the secondary coil 2b of the ignition coil 4 is simply ignited by the ignition plug 25 as described above. No secondary voltage is generated.

As a result, the internal combustion engine becomes misfired and the vehicle speed is reduced to prevent excessive speed.

In this embodiment, the misfire control circuit B
Although the resistor 22 is connected to the above, it may not be necessarily connected depending on the current capacity at the time of a short circuit and the charging voltage of the charging / discharging capacitor 3 for ignition for the convenience of design.

Also, the first capacitor 14 and the resistor 1
It goes without saying that the time constants set at 6 and 20 are set to values that sufficiently reduce the vehicle speed from the predetermined excess speed.

FIG. 2 shows another embodiment of the present invention. The difference from FIG. 1 is that, instead of the speed warning lamp operation switch 26 of the vehicle as the switch means, the rotation speed of the internal combustion engine detected by the rotation speed detection means 27 of the internal combustion engine becomes equal to or higher than the set overspeed. The point is that the transistor 28, which is a rotation speed detection switch that outputs an operation signal when it becomes low, is used.

In this embodiment, the rotation speed detecting means 27 is controlled so that the transistor 28 is turned on for a very short time, and the internal combustion engine is not overspeeded but overspeeded more than the set speed. When this happens, misfire control similar to that of the first embodiment is performed.

The same components as those shown in FIG. 1 are denoted by the same reference numerals, and the description of the duplicated configurations and operations will be omitted.

Also in this embodiment, the set time constant set by the first capacitor 14 and the resistors 16 and 20 is set to a value at which the rotational speed of the internal combustion engine is sufficiently lower than the predetermined overspeed. Needless to say.

FIG. 3 shows still another embodiment of the present invention. A holding circuit C as shown in FIG. 1 is connected between the trigger coils 6, and an ignition timing retarding control circuit D for controlling the thyristor 5 which is the first switching element is connected to the holding circuit C. It is a thing.

That is, the diode 12, the resistor 13, the first capacitor 14, the diode 15, and the speed warning lamp operation switch 26 are connected in series, and this series circuit is connected in series to the trigger coil 6, as in FIG. , The third switching element via the resistor 16, the diode 21, and the resistor 20, respectively, between the connection midpoint of the resistor 13 and the first capacitor 14 and the connection midpoint of the first capacitor 14 and the diode 15. It is connected to the emitter and base of the transistor 18. Also,
The emitter of the transistor 18 is grounded via the resistor 17, and the collector is connected via the resistor 19 to the gate of a thyristor as a fourth switching element described later.

Further, the ignition timing retard control circuit D includes a thyristor 29, which is the fourth switching element connected in series to the trigger coil 6 via a capacitor 30,
The thyristor 29 is composed of a rectifying diode 31 connected in antiparallel to the thyristor 29, and the gate of the thyristor 29 is connected to the collector of the transistor 18 via the resistor 19.

Next, the operation will be described. First, if the vehicle is traveling at a steady speed below the set overspeed,
Normal ignition timing control similar to that described with reference to FIG. 1 is performed.

On the other hand, when the vehicle exceeds the set excess speed (so-called overspeed), the speed warning light operating switch 26 is turned on for a very short time.

As a result, the positive induced voltage of the trigger coil 6 causes the diode 12, the resistor 13, the first capacitor 14, the diode 15 and the path of the speed warning lamp operating switch 26, the diode 12, the resistors 13, 16 and 17 and the path of the diode 12, the resistors 13 and 16, the emitter / base of the transistor 18 which is the third switching element, the resistor 20, the diodes 21 and 15 and the speed warning lamp operation switch 26, respectively. An electric current flows.

As a result, the first capacitor 14 is charged with electric charges, and even after the speed warning lamp operation switch 26 is turned off, the electric charge of the first capacitor 14 remains in the resistor 16, the emitter / base of the transistor 18, It is discharged through the path of the resistor 20 and the diode 21.

This discharge is caused by the first capacitor 14,
The discharge time constant determined by the resistors 16 and 20 keeps the transistor 18 conductive for a set time.

Therefore, when the positive induced voltage of the trigger coil 6 is generated, the diode 12, the resistors 13, 1 are
6, emitter / collector of transistor 18, resistance 1
9, the current flows through the gate / cathode of the thyristor 29, which is the fourth switching element, and the path of the capacitor 30.

As a result, the thyristor 29, which is the second switching element, is triggered and becomes conductive.
A current will flow through the path between the anode / cathode of the thyristor 29 and the second capacitor 30, and the second capacitor 30 will be charged with electric charges.

Therefore, while the second capacitor 30 is being charged with electric charge, a sufficient current does not flow between the gate and cathode of the thyristor 5, which is the first switching element, to trigger it. become.

After that, the second capacitor 3
When 0 completes the charging, the electric charge charged in the second capacitor 30 becomes the diode 31, the resistor 7, the thyristor 5
Therefore, the thyristor 5 is triggered and becomes conductive.

As a result, the charge stored in the ignition charging / discharging capacitor 3 is the anode / cathode of the thyristor 5 and the ignition coil 4 which are the first switching elements.
The secondary coil 4a of the ignition coil 4 is discharged due to the discharge in the path of the primary coil 4a. As a result, spark ignition is performed by the spark plug 25.

The ignition timing at this time is delayed from the ignition timing at the steady speed equal to or lower than the excess speed, that is, the ignition timing delayed by the set retard amount determined by the second capacitor 30. The speed of the vehicle can be controlled from the set excessive speed to the steady speed or less.

In the explanation of FIGS. 1 and 3. Although it is described that the speed of the vehicle is apparently controlled, it goes without saying that the rotation of the internal combustion engine is actually controlled.

Also in this embodiment, in place of the speed warning operation switch 26, a rotation speed detecting means 27 and a transistor 28 as shown in FIG. 2 are provided to retard the ignition timing. It can also be applied to prevent excessive rotation of an internal combustion engine.

Further, it goes without saying that the set time constant of the first capacitor 14 and the resistors 16 and 20 is set to a value at which the vehicle speed is sufficiently reduced from the excessive speed.

[0058]

As described above, according to the first aspect of the present invention, when the rotation speed of the internal combustion engine or the speed of the vehicle equipped with the internal combustion engine exceeds a set value, it is turned on for a predetermined time, and the generator coil is turned on. Switch means for charging a first capacitor connected in series, and a third switching element for holding an on state by a discharge time constant of a time constant circuit including the first capacitor after the switch means is turned off. With
Since the second switching element connected in series to the power generation coil is configured to limit the power supply to the ignition charging / discharging capacitor while the ON state of the third switching element is maintained, the internal combustion engine is overheated. According to the output signal of the switch means that operates when rotating or when the vehicle exceeds the set speed, misfire control or ignition timing control of the internal combustion engine is enabled, and it is possible to avoid the above-mentioned over-rotation or the travel exceeding the set speed, which is easy. There is an effect that what can be realized at low cost with various systems.

According to the second aspect of the present invention, when the rotational speed of the internal combustion engine or the speed of the vehicle equipped with the internal combustion engine exceeds a set value, the engine is turned on for a predetermined time and is connected directly to the trigger coil. Switch means for charging a capacitor, a third switching element for holding an on state by a discharge time constant of a time constant circuit including the first capacitor after the switch means is turned off, and a second for the trigger coil The fourth switching element connected in series via the capacitor controls the trigger of the first switching element while the third switching element is held in the ON state and the second capacitor is being charged. With this configuration, the output of the switch means that operates when the internal combustion engine is over-rotating or when the vehicle is traveling at a speed exceeding the set speed is triggered by the trigger coil. The trigger timing of the switching element, by delaying by a time constant circuit including a capacitor, a running exceeding the overspeed and the set speed, the effect of which can be avoided is obtained in simple and low-cost configuration.

According to the third aspect of the present invention, the switch means is configured to be the speed warning light operation switch of the vehicle. Therefore, the internal combustion engine is operated by using the operation signal of the speed warning light operation switch of the vehicle. There is an effect that it is possible to easily control the misfire or the ignition timing.

According to the fourth aspect of the present invention, the switch means is configured as a switch for detecting the rotation speed of the internal combustion engine. Therefore, by using the operation signal of the switch means for detecting the rotation speed of the internal combustion engine, There is an effect that the ignition timing control or the misfire control of the internal combustion engine can be easily obtained.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing a non-contact ignition device for an internal combustion engine according to an embodiment of the present invention.

FIG. 2 is a circuit diagram showing a contactless ignition device according to another embodiment of the present invention.

FIG. 3 is a circuit diagram showing a contactless ignition device according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Generator coil 2 Diode 3 Charging / discharging capacitor for ignition 4 Ignition coil 5 Thyristor (first switching element) 23 Thyristor (second switching element) 18 Transistor (third switching element) 26 Speed warning lamp operation switch (switch) Means) 28 transistor (switch means) 29 thyristor (fourth switching element) A non-contact ignition circuit B ignition control circuit C holding circuit

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI technical display area F02P 11/02 301 FL

Claims (4)

[Claims] 1. A power generation coil for inducing a voltage by rotation of a rotor having magnetic poles, an ignition charging / discharging capacitor for charging an induction voltage of the power generation coil through a diode, and a voltage for inducing voltage by rotation of the rotor. A trigger coil,
A non-contact ignition device for an internal combustion engine, comprising: a first switching element which conducts when an induced voltage of the trigger coil reaches a predetermined trigger level and supplies the charge of the ignition charge / discharge capacitor to the ignition coil. A switch means for turning on the first capacitor connected in series to the generator coil for a predetermined time when the rotation speed of the internal combustion engine or the speed of a vehicle equipped with the internal combustion engine exceeds a set value. A third switching element that holds an ON state with a discharge time constant of a time constant circuit including the first capacitor after the switch means is turned off, and a third switching element that is connected in series to the generator coil A non-contact ignition device for an internal combustion engine, comprising: a second switching element that limits power supply to the ignition charging / discharging capacitor while the ON state is maintained. 2. A generator coil for inducing a voltage by rotation of a rotor having magnetic poles, an ignition charge / discharge capacitor for charging the induced voltage of the generator coil through a diode, and a voltage for induction of rotation of the rotor. A trigger coil,
A non-contact ignition device for an internal combustion engine, comprising: a first switching element which conducts when an induced voltage of the trigger coil reaches a predetermined trigger level and supplies the charge of the ignition charge / discharge capacitor to the ignition coil. A switch means for turning on the first capacitor directly connected to the trigger coil for a predetermined time when the rotational speed of the internal combustion engine or the speed of a vehicle equipped with the internal combustion engine exceeds a set value. A third switching element, which holds an ON state with a discharge time constant of a time constant circuit including the first capacitor after the switch means is turned off, and is connected in series to the trigger coil via a second capacitor, The third switching element is turned on while the on state is maintained, and the trigger of the first switching element is restricted during charging of the second capacitor. The fourth non-contact ignition apparatus for an internal combustion engine having a switching element. 3. The non-contact ignition device for an internal combustion engine according to claim 1, wherein the switch means is an operating switch for a speed warning light of a vehicle. 4. The contactless ignition of an internal combustion engine according to claim 1, wherein the switch means is a rotation speed detection switch that operates by detecting a set overspeed of the internal combustion engine. apparatus.