JPS6345466A - Ignition device for internal combustion engine mounted on car - Google Patents

Abstract

PURPOSE:To provide an ignition device which is not ignited when a gear position is a reverse position in relation to even a no-battery-mounted car, by providing a unidirectional element wherein, when a reverse switch is in an OFF-state, current from an a.c. generator flows only to a switching means. CONSTITUTION:The a.c. voltage of an exciter coil 11 is semiwave-rectified to charge a capacitor 14 and the voltage is fed to an SCR 18. An ignition timing signal from a pulser coil 20 is fed through a diode 19 to a transistor 32. The a.c. voltage of a lamp coil 12 causes turning OFF of the transistor 32 by means of a unidirectional element 43 when a reverse switch 25 is in an OFF-state (in a forward position), the SCR 18 is turned OFF according to an ignition timing signal to effect spark discharge. Further, even if a gear is shifted to a reverse position after the starting, the transistor 32 is maintained in an OFF- state. Meanwhile, when, with the reverse switch turned ON, the engine is brought into a starting operation state, the transistor 32 is brought into an ON-state, an ignition timing signal from the pulse coil 20 flows in earth, and the SCR 18 is not turned OFF, no spark discharge is generated. This constitution enables achievement of a purpose.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ignition device for an internal combustion engine mounted on a vehicle, and particularly to an ignition device used in a vehicle not equipped with a battery.

First, conventional ignition systems for internal combustion engines, especially those installed in buggies, are designed to prevent spark discharge from occurring at the spark plug when the vehicle is in the reverse gear position. There is. This is to prevent the engine from starting so that the vehicle does not suddenly retreat 1 point when the engine starts.

However, in the past, it was possible to easily obtain such a preventive action when starting the engine because it was equipped with a battery, and in order to reduce the risk of an accident, vehicles without a battery have to be placed in the reverse position when starting the engine. It is difficult to prevent the ignition from occurring and to continue the ignition regardless of the gear position after the engine has started.

Therefore, an object of the present invention is to provide an ignition device for an internal combustion engine that can reliably prevent ignition when the gear position is in the reverse position when starting the engine in a vehicle without a battery.

The in-vehicle internal combustion engine ignition device of the present invention has a reverse switch that is turned on when the gear position of the vehicle's transmission is in the reverse position and a reverse display lamp that are connected in series, and generates electricity using an alternating current generator in the series circuit. A switching means consisting of a transistor or the like that supplies alternating current voltage and turns on when current flows in from the connection line between the reverse switch and the lamp, and a switching means that supplies current from the alternator from the connection line when the reverse switch is turned off. a unidirectional element such that flow only towards the means;
An impedance element connected in parallel to the lamp is provided, and when the switching means is turned on, the on state is maintained and a high voltage is supplied to the ignition plug to generate a spark discharge. There is.

and-e-3 Embodiments of the present invention will be described below with reference to the drawings.

In the ignition 'IA' position shown in FIG. 1, which is an embodiment of the present invention, an exciter coil 11 is used to ignite an alternator that generates electricity according to the rotation of the crankshaft by means of a magnet connected to the crankshaft of an engine (not shown). This is a power generation output coil for use.

Further, the lamp coil 12 is a power generation output coil for lamp lighting provided in the alternator. Exciter coil 1
One end of the ignition coil 15 is grounded, and the other end connects the diode 13 in the forward direction and the ignition coil 15 through the capacitor 14.
It is connected to one end of the next winding 15a. Ignition coil 15
The secondary winding of is connected to the spark plug 16.

Further, an SCR (thyristor) 18 is connected between the connection line between the diode 13 and the capacitor 14 and the ground. The gate of 5CR18 is connected to one end of pulser coil 20 via diode 19. The pulsar coil 20 is an output coil of a pulsar generator that generates a pulsed ignition timing signal at a predetermined rotational position of the crankshaft.

One end of the lamp coil 12 is grounded, and the other end is grounded via the headlamp switch 22 and headlamp 23, so that when the switch 22 is turned on, the headlamp 23 is turned on.
is now lit. A reverse display lamp 2 is included in the series circuit of this switch 22 and headlamp 23.
4 and a reverse switch 25 are connected in parallel. The reverse switch 25 is a switch that is turned on when the gear position of the vehicle's transmission (not shown) is in the reverse position. Further, a resistor 26 is connected in parallel to the reverse display lamp 24.

An ignition control circuit 28 is connected to the connection line between the lamp 24 and the reverse switch 25. Ignition control circuit 28
are transistors 29 to 32, resistors 34 to 39,
It consists of a capacitor 42 and diodes 43 and 44. The connection line between the lamp 24 and the reverse switch 25 has a unidirectional element diode 43 in the forward direction and a resistor 34 in the forward direction.
It is connected to the base of the NPN transistor 29 via. The emitter of the transistor 29 is grounded, and the collector is connected via a resistor 35 to the base of a PNPi transistor 30. The emitter of the transistor 30 has a resistor 3 connected to the connection line between the diode 13 and the capacitor 14.
3, a voltage stabilizing circuit 46 consisting of a capacitor 41 and a Zener diode 45, and its collector connected to the base of the NPN transistor 31 via a resistor 36. The collector of transistor 31 is NPN
It is connected to the base of transistor 32 and to one terminal of transistor 30 via resistor 37.

The emitters of transistors 31 and 32 are both grounded, and the collector of transistor 32 is connected to the gate of 5CR18.

The collector of the transistor 30 is grounded via a resistor 38 and a capacitor 42, and is also connected to the base of the transistor 29 via a diode 44 in the forward direction and a resistor 39. Here, the transistor 29 forms a main part of the switching means that is turned on depending on the level of the connection line between the reverse switch 25 and the lamp 24, and the ignition control circuit 28 maintains the on state of the transistor 29. .

In the ignition device according to the present invention having such a configuration, the AC voltage generated in the exciter coil 11 is half-wave rectified by the diode 13 and supplied to the capacitor υ14, so that the capacitor 14 is charged.

An ignition timing signal is generated from the balsa coil 20 at a predetermined crank angle position, and this ignition timing signal is supplied to the gate of the 5CR 18 via the diode 19. As a result, if the transistor 32 is off, the 5CR18 is turned on, and the stored charge in the capacitor 14 is discharged at once to the primary winding 15a of the ignition coil 15, so this discharge energy causes the secondary winding 115b1. :g voltage is generated, and a spark discharge occurs in the ignition plug 16.

The AC voltage generated in the lamp coil 12 is supplied to a series circuit including a lamp 24, a resistor 26, and a reverse switch 25. When the gear position of the vehicle's transmission is in the forward (forward) position, such as first or second gear, the reverse switch 25 is off, so current flows from the lamp coil 12 to the lamp 24, resistor 26, diode 43, and resistor 34. from the voltage stabilizing circuit 46 to the emitter-base of the transistor 30, and from the resistor 3 to the base of the transistor 29 through the
Since the collector current flows to the transistor 29 through the transistor 5, the transistor 29 is turned on and the transistor 30 is also turned on. Turning on transistor 30 causes voltage stabilization circuit 46 to transfer transistor 30 to resistor 36.
Since the base current flows through the transistor 31 through the transistor 31, the transistor 31 is turned on and the base potential of the transistor 32 is made almost equal to the ground potential. This turns the transistor 32 off, so if the gear position is not the reverse position, the 5CR 18 turns on in response to the ignition timing signal as described above, causing the spark plug 16 to generate a spark discharge.

In addition, the output voltage of the voltage stabilizing circuit 46 is supplied across the capacitor 42 via the transistor 30, and is further supplied to the base of the transistor 29 via the diode 44 and the resistor 39, so that the voltage supplied from the resistor 34 is rippled. Even if there is a large pulsating voltage, once the transistor 29 is turned on, it remains on until the engine stops rotating. Therefore, after starting the engine, the gear position of the transmission is changed to the reverse position, and the reverse switch 25 is turned on, the lamp 24 lights up, and the lamp 2 is turned on.
Even if the connection line between ignition timing signal 4 and reverse switch 25 becomes equal to the ground level, spark plug 1
6, a spark discharge occurs.

Next, when the engine is started while the gear position of the transmission is in the reverse position, the reverse switch 25 is turned on and the voltage generated in the lamp coil 12 lights up the lamp 24. However, since the connection line between the lamp 24 and the reverse switch 25 becomes approximately equal to the ground level, the transistor 29 does not turn on and continues to be off. When the transistor 29 is turned off, the transistor 30 is also turned off, so that no base current flows through the transistor 31, and the transistor 31 is turned off. When the transistor 31 is off, a base current flows from the voltage stabilizing circuit 46 to the transistor 32 via the resistor 37, so that the transistor 32 is turned on.

Therefore, the ignition timing signal from the pulsar coil 20 is 5CR1.
Even if the voltage is supplied to the gate of the ignition plug 16, it flows to the ground through the collector-emitter of the transistor 32, and the 5CR18 is not turned on, so no spark discharge occurs in the spark plug 16.

Next, if the filament of the reverse indicator lamp 24 is disconnected due to its lifespan or the like, the current from the lamp coil 12 is supplied to the ignition control circuit 28 via the resistor 26, so the lamp will not work even if the reverse position f25 is turned on. 21
1 does not light up, but other than that, the same operation as above can be performed except for 1.

The ignition device of the present invention includes a reverse display lamp 24, a reverse switch 25, and an ignition control circuit 28.
By connecting the main harness 47, the rib harness 48, and the turntable 49 at one end of the reverse switch 25 as shown in FIG. 2, it is possible to cope with both oven and short circuit of the rib harness 48.

In other words, since the sub-harness 48 is more easily damaged than the main harness 47, it may be in an oven or short-circuit state, but in the oven state, the ignition control circuit 2
Since no current flows into the transistor 29 in the engine 8, the transistor 29 does not turn on and the engine does not start. Furthermore, in the case of a short circuit, the engine will not start due to the same operation as when the reverse switch 25 is on. This means that if the current flows from the ignition control circuit 28 to the ground via the reverse switch 25 when the reverse switch 25 is on, the engine will not work even if the gear position is in the reverse position if the sub-harness is in the oven state. However, according to the present invention, such a situation can be prevented.

In the embodiment of the present invention described above, the diode 43 as a unidirectional element is provided between the connection line of the lamp 24 and the reverse switch 25 and the resistor 34, but the diode 43 is provided between the lamp coil 12 and the lamp 24. It may be provided between the lamp 24 and the reverse switch 25, or on the lamp side from the connection point of the connection line between the lamp 24 and the reverse switch 25 to the two transistors.

As described above, in the internal combustion engine ignition system of the present invention, when the gear position of the transmission is not in the reverse position, the current from the alternator is transferred from the connection line of the reverse switch and the reverse display lamp to the switching means. When the 9th gear is in the reverse position, the reverse switch is turned on and no current flows to the switching element, so when the engine starts in A-vehicles without batteries, such as buggies, the gear position of the transmission is in the reverse position. In such a case, the switching means will not turn on and ignition can be reliably prevented. Furthermore, since the switching means is kept in the on state by the holding means at engine start #[, ignition is continued even if the gear position is in the reverse position.

Further, as described above, even if a short circuit occurs in the wiring harness or an abnormality occurs in the oven, it is possible to take sufficient measures to prevent malfunctions.

Furthermore, since an impedance element is provided in parallel with the reverse display lamp, even if the filament of the lamp is disconnected, ignition can be ensured when the gear position of the transmission is other than the reverse position.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing connections in the device of FIG. 1. Explanation of symbols of main parts 11... Exciter coil 12... Lamp coil 15... Ignition coil 16... Spark plug 20... Balsa Coil 22...Headlamp switch 23...
・Headlamp 24... Reverse indicator lamp 25...
・Reverse switch 28...Ignition control circuit

Claims (1)

[Claims] A reverse switch that is turned on when the gear position of the vehicle transmission is in the reverse position, a reverse display lamp connected in series with the reverse switch, and the reverse switch that generates alternating current voltage in accordance with the rotation of the internal combustion engine. and an alternator that supplies a generated alternating current voltage to the series circuit of the lamp, and a switching means that has a control end connected to a connection line between the reverse switch and the lamp and is turned on when current flows into the control end; a unidirectional element provided so that current from the alternator flows only from the connection line toward the control end of the switching means when the reverse switch is turned off; and a holding means for keeping the switching means turned on. an impedance element connected in parallel to the lamp, an ignition timing signal generating means for generating an ignition timing signal synchronized with the rotation of the internal combustion engine, and a high voltage according to the ignition timing signal during the ON period of the switching means. 1. An ignition device comprising: high voltage generating means for supplying a high voltage to a spark plug to generate a spark discharge.