JPH09324732A - Ignition controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an sufficient ignition voltage to be provided at the time of start even if a battery comes in trouble only beams of kick, by connecting an electric load device other than an ignitor and a battery to a generator via a means for breaking a circuit in compliance with the detection result of a supply voltage and directly connecting a CDI circuit to the generator. SOLUTION: When a battery 3 makes its function normally, a proper voltage is supplied to a DC-DC converter 6 from an AC generator 1 after starting an engine so as to charge electricity to the battery 3. If this battery 3 makes no function and an output voltage from the AC generator 1 drops below a preset value (e.g. 7V), power supply to a thyristor control circuit 2a is interrupted, so as to cut off a circuit behind the thyristor SCR is interrupted. Thereby, the maximum value of an output voltage from the AC generator 1 is kept always above, for instance, 7V, and by inputting this output voltage directly to the DC-DC converter 6 without through a regulator circuit 2, a sufficient ignition voltage is obtained to enable engine start.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ignition control device, and more particularly to a CDI circuit for charging a capacitor with a power supply from a generator, discharging the capacitor according to ignition timing and supplying an ignition current to an engine ignition device. The present invention relates to an ignition control device having.

[0002]

2. Description of the Related Art Various types of ignition control devices for automobile engines are used. For example, in a motorcycle, a DC-DC converter boosts a power supply voltage and supplies it to a CDI type ignition device (DCCDI). There is.

FIG. 3 schematically shows a circuit configuration of a control device of a conventional DCDI ignition device. AC generator 1
Is connected to the battery 3, the stop lamp 4, the meter lamp 5 and the like via the regulator circuit 12, and the DC
The primary winding 7a in the transformer 7 of the DC converter 6
Is connected to one end. The other end of the primary winding 7a is selectively grounded via a switching transistor T controlled by the DC-DC converter control circuit 8. On the other hand, the secondary winding 7b in the transformer 7 of the DC-DC converter 6 is connected to the ignition device 9.

[0004]

With the above configuration, for example, when the battery 3 is removed or cannot be charged, the power supplied from the AC generator 1 is the regulator circuit 1.
2, the battery 3, the stop lamp 4, the meter lamp 5 and other electrical loads are consumed, the desired voltage cannot be obtained in the primary winding 7a of the DC-DC converter 6, and the DC-DC
The converter 6 may not operate, or its output voltage may decrease even if it operates, and a voltage sufficient to ignite the ignition capacitor Cc may not be obtained.

The above-mentioned problem similarly occurs in the CDI type ignition device without using the DC-DC converter, and also in the case where the AC generator has three phases.

The present invention has been made in view of the above-mentioned problems of the prior art, and its main purpose is to consume the output of the generator for other electric loads when the battery is not functioning. It is an object of the present invention to provide an ignition control device capable of supplying the CDI exclusively and prioritizing the start of the engine.

[0007]

According to the present invention, the above-mentioned object is achieved by connecting an ignition device of an engine and another electric load device in parallel with a generator and a battery, and supplying from the generator. An ignition control device having a CDI circuit for charging and discharging a capacitor by a power source to supply an ignition current to an ignition device of the engine, wherein the other electric load device and the battery are supplied with voltage from the generator. Is connected to the generator through a means for detecting the current and disconnecting the circuit in accordance with the detection result, and the CDI circuit is directly connected to the generator, and is supplied from the generator when the engine is ignited. When the voltage is lower than a predetermined value, the circuit breaker means stops the supply of power to the other electric load circuit and the battery. It is achieved by providing a.
In this way, when the supply voltage from the AC generator is low, the current to other electric loads is cut off, and power is directly supplied only to the CDI.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below in detail based on specific examples shown in the accompanying drawings.

FIG. 1 is a control circuit diagram of a main part of an ignition device for an engine of a motorcycle to which the present invention is applied. The AC generator 1 includes a battery 3, a stop lamp 4 as an electric load device, and a meter lamp 5 via a regulator circuit 2.
D that forms a part of the CDI via a known rectification / overvoltage protection circuit without being connected to the regulator circuit 2.
Primary winding 7 in transformer 7 of C-DC converter 6
It is connected to one end of a. The secondary winding 7b of the transformer 7 is connected to the ignition device 9. In addition, the primary winding 7
The other end of a is selectively grounded via a switching transistor T controlled by the DC-DC converter control circuit 8.

The regulator circuit 2 includes a thyristor SCR provided between the AC generator 1, the battery 3, the stop lamp 4, and the meter lamp 5, and the thyristor S.
Thyristor control circuit 2a connected to the gate terminal of CR
And the circuit behind the thyristor SCR by selectively stopping the power supply to the thyristor control circuit 2a according to the output voltage from the AC generator 1 (battery 3, stop lamp 4 as an electric load device, meter lamp 5). ), A Zener diode ZR, a transistor TR, and a cutoff circuit 2b composed of a resistor.

The operating procedure of this circuit will be described below. First, when the normal battery 3 is functioning normally and after the engine is started, a sufficient output can be obtained from the AC generator 1. Therefore, the DC-DC converter 6
Is supplied with an appropriate voltage, the battery 3 is charged, and the stop lamp 4 and the meter lamp 5 also operate properly.

Here, when the battery 3 fails due to a failure or the like, the output voltage (CH terminal) from the AC generator 1 fluctuates, but when a kick is made to start the engine, other electric power is conventionally used. Since a current also flows through a static load device (stop lamp 4, meter lamp 5, etc.), the voltage is as low as about 4 V at the maximum as shown by the wavy line, and the input voltage to the DC-DC converter 6 is 3 V due to the regulator circuit. It will be about. Since the DC-DC converter 6 is almost inoperative at this voltage, the ignition voltage cannot be obtained.

On the other hand, according to the present invention, when the output voltage from the AC generator 1 becomes lower than a predetermined value (for example, 7 V),
Since the Zener diode ZR does not conduct and the transistor TR does not turn on, the power supply to the thyristor control circuit 2a is stopped and the circuit behind the thyristor SCR is cut off. Therefore, the maximum output voltage from the AC generator 1 is reached. Always exceeds 7V, for example. Moreover, since this output voltage does not go through the regulator circuit 2, it is almost DC.
-Input to the DC converter 6. If this voltage is D
Since the C-DC converter 6 operates and the capacitor Cc is sufficiently charged to obtain the ignition voltage, the engine can be easily ignited, that is, started.

In this embodiment, a single-phase AC generator is used, but the same applies to the case of three-phase. In that case, at least one diode in the regulator circuit is used as a thyristor to perform the same processing as described above. I'll do it.
Further, in this embodiment, the DCCD is used for engine ignition control.
CDI without using a DC-DC converter
However, it goes without saying that the same can be applied. Other than the above, examples of the electric load device include a fuel gauge, a starter motor, and a tail lamp and a headlight depending on the circuit configuration.

[0015]

As described above, according to the present invention, the electric load device other than the ignition device and the battery are detected by means of detecting the supply voltage from the generator and breaking the circuit according to the detection result. To connect to the generator and to connect the CDI circuit directly to the generator, and to stop the supply of power to the other load device and the battery when the voltage supplied from the generator is lower than a predetermined value when the engine is ignited. As a result, even if the battery fails, a sufficient ignition voltage can be supplied to the ignition device at the time of starting only by kicking.

[Brief description of drawings]

FIG. 1 is a circuit diagram of a main part of an ignition control device for an engine of a motorcycle to which the present invention is applied.

FIG. 2 is a time chart showing a voltage waveform in a main part of the control circuit of FIG. 1;

FIG. 3 is a circuit diagram of a main part of a conventional ignition control device.

[Explanation of symbols]

 1 AC Generator 2 Regulator Circuit 2a Thyristor Control Circuit 2b Shutoff Circuit 3 Battery 4 Stop Lamp 5 Meter Lamp 6 DC-DC Converter 7 Transformer 7a Primary Winding 7b Secondary Winding 8 DC-DC Converter Control Circuit 9 Ignition Device 9 Binary Angle control CPU 12 regulator circuit

[Procedure amendment]

[Submission date] May 9, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Fig. 1

[Correction method] Change

[Correction contents]

FIG.

Claims (2)

[Claims] 1. An engine ignition device and another electric load device are connected in parallel to a generator and a battery, and a capacitor is charged and discharged by a power supply from the generator to ignite the engine ignition device. CD for supplying current
An ignition control device having an I circuit, wherein the other electric load device and the battery detect the supply voltage from the generator and cut off the circuit according to the detection result. And the CDI circuit is directly connected to the generator, and when the voltage supplied from the generator is lower than a predetermined value when the engine is ignited, the circuit breaking means causes the other electric load circuit to be connected. And an ignition control device, characterized in that the supply of power to the battery is stopped. 2. A DC-DC converter that boosts a supply voltage from the generator and supplies the boosted voltage to the CDI circuit, and a regulator circuit interposed between the generator and the other electric load device and the battery. 2. The ignition control device according to claim 1, further comprising: and the regulator circuit also serves as the circuit breaking unit.