JPS6291663A - Speed control device for vehicle - Google Patents

Abstract

PURPOSE:To enable an engine speed to be positively reduced by connecting a short circuit with an electromotive section in parallel with an ignition unit so as to allow the short circuit to be established when an engine runs at a high speed and when a throttle actuating section is brought to a fully closed condition allowing the engine to misfire. CONSTITUTION:When a vehicle such as a motor-cycle and the like is running at a high speed, as frequencies generated by a pulser soil 15 of a fly wheel generator 10 is high, voltage accumulated in a FV converter 23 will be high in a short time. And when the accumulated voltage capacity exceeds a specified value, a constant voltage diode 24 is turned on. This causes a SRC 21 to be energized allowing a switching circuit 20 to be turned on. Under this ON condition, if a throttle actuating section 1 is returned to a fully closed condition, a switch 7 which detects the above said condition, is turned on so as to establish a short circuit 27 for short-circuiting the current of a charge coil 14. Accordingly, electric current to a CID unit 11 is suspended, and ignition plugs 13 are allowed to misfire for reducing and engine speed.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to a vehicle speed control device.

[Prior art]

When a vehicle such as a motorcycle is operated at high speed for a long period of time, the throttle valve of the carburetor becomes difficult to move due to a phenomenon called icing, where water in the air-fuel mixture freezes.
Even if the throttle operating section is returned to fully closed, the throttle valve may not be able to return immediately and the traveling speed may not be reduced.

[Purpose of the invention]

An object of the present invention is to provide a speed control device for a vehicle that can automatically reduce engine rotation even if the throttle valve fails to return as described above, as long as the throttle operation section is returned to the fully closed position. It is about providing.

[Structure of the invention]

To achieve the above object, the present invention connects a capacitive discharge type ignition unit to an electromotive unit consisting of a charge coil and a pulser coil driven by a crankshaft, and drives the ignition coil by this capacitive discharge type ignition unit 1-. In addition, a short circuit is connected to the electromotive section in parallel with the capacitive discharge type ignition unit, and a switching circuit that is turned on when the crankshaft rotates at high speed and a throttle operating section are connected to the short circuit. It is characterized by a series connection of switches that turn on when the power is returned to full open.

〔Example〕

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 2.3 schematically shows the throttle operating section 1 and carburetor 2 of a motorcycle to which the present invention is applied. The throttle operation section 1 rotatably supports a throttle grip section 4 on a handle 3, and the throttle operation section 1 rotatably supports a throttle grip section 4 on a handle 3.
A wire 5 is wound around the inner end of the wire. This wire 5 is connected to a piston-shaped throttle valve 6 in the carburetor 2, and the throttle valve 6, which tends to return to the closed direction due to gravity, can be operated to the full open position by rotating the throttle grip 4. . Further, a protrusion 4a is integrally formed on the throttle grip portion 4, and a switch 7 is provided opposite to the protrusion 4a. Therefore, when the throttle grip 4 is returned to the fully closed position, the protrusion 4a presses the switch 7, turning the switch 7 on.

FIG. 1 is an electrical circuit diagram configuring the speed control device of the present invention. 10 is a flywheel generator attached to the crankshaft of an engine (not shown); 11 is a CDI unit (capacitive discharge ignition unit); 12 is an ignition coil;
3 is a spark plug. The flywheel generator 10 has a charge coil 14 and a pulser coil 15, which serve as an electromotive portion for the CDI unit 11. Also,
The CDI unit 11 connects a capacitor 17 to the charge coil 14 via a diode 16, and
A 5CR (silicon controlled rectifier) 19 is connected to short-circuit this capacitor 17 to the ignition coil 14.
The S'CR 19 is connected to the pulsar coil 15 via a diode 18.

Further, a short circuit 28 is connected to the charge coil 14 of the electromotive section in parallel with the CDI unit 11, and the short circuit 28 connects the switching circuit 20 connected in series and the switch 7 of the throttle operation section 1 described above. It consists of A 5CR21 is connected to the switching circuit 20, and a diode 22. The pulser coil 15 is connected to an FV converter (frequency/voltage converter) 23 through a constant voltage diode 24. FV converter 23 includes capacitor 25 and resistor 26
The pulser coil 15 stores the voltage generated in a pulsed manner, and when the stored voltage capacity exceeds the breakdown voltage of the constant voltage diode 24, it discharges and the gate G of the 5CR21 Load current. 5 due to the current load on this gate G.
CR21 is turned on, causing current to flow from the anode A to the cathode. Therefore, in this state, when the throttle operation section 1 is returned to the fully closed state and the switch 7 is turned on, the short circuit 28 is turned on and the charging coil 14 is turned on.
The current generated is short-circuited and no longer flows to the CDI unit 7) 11 side.

In the speed control device described above, when the vehicle is driven at high speed, the frequency generated by the pulser coil 15 is high, so the voltage accumulated in the FV converter 23 becomes high in a short time. Therefore, the constant voltage diode 24 is turned on and a current flows to the gate G of 5CR21.
In this case, current flows from the anode A to the cathode, and the switching circuit 20 is turned on. In this on state, when the throttle operating section 1 is returned to full open, the switch 7 is turned on, the short circuit 28 is closed, and the current in the charging coil 14 is short-circuited. Therefore, no current flows to the CDI unit 11 side, and the ignition coil 12 is not driven, causing the ignition plug 13 to misfire.

Therefore, when the throttle operation unit 1 is returned to full open from a high-speed running state, even if the throttle valve 6 is not returned to its original position due to icing or the like, the rotation of the engine will decrease due to the above-mentioned misfire phenomenon.

In this way, when the engine rotation becomes low over a certain level, the frequency generated by the pulse coil 15 decreases until the voltage accumulated in the FV controller 23 reaches the breakdown voltage of the voltage regulator diode 24. The time becomes longer, and as a result, the constant voltage diode 24 is off, so no current flows through the gate G of the 5CR 21, the switching circuit 20 is turned off, and the short circuit 28 is opened. Therefore, the current from the charging coil 14 flows through the CDI unit 11, causing the ignition plug 13 to fire again, so that there is no problem in continuing the vehicle.

Also, when the rotation speed is low, the spark plug 13 is turned off again.
If the clutch that transmits power from the engine to the drive wheels is a centrifugal clutch, the low-speed rotation when ignition is restarted as described above is such that the centrifugal clutch does not transmit power. It is preferable to set it so that the rotation is as follows. Of course, even if the rotation is reduced to such an extent that the centrifugal clutch is engaged, this does not pose a problem since the engine is already rotating at a low speed.

In addition, in the above-mentioned speed control device, during normal driving,
Since the switch 7 is off, the short circuit 28 is open, and normal ignition control is performed by the CDI unit 1-11. Furthermore, even when the throttle operating section 1 is returned to the fully closed position when the engine speed is low, although the switch 7 is turned on, the constant voltage diode 24 is not turned on, so the switching circuit 20 is turned off in any case. Normal ignition control is still performed by the CDI unit 11.

Note that the position where the switch 7 is turned on is preferably a position where the throttle operating section 1 is completely closed as in the above-mentioned embodiment, but it is not necessarily a completely closed position.
There is no problem even if it is in a position close to fully closed.

〔Effect of the invention〕

As described above, the present invention includes an ignition control circuit in which a CDI unit is connected to an electromotive unit consisting of a charge coil and a pulser coil driven by a crankshaft, and the ignition coil is driven by the CDI unit. A short circuit is connected to the electromotive section in parallel with the CDI unit, and this short circuit includes a switching circuit that turns on when the crankshaft rotates at high speed, and a switch that turns on when the throttle operation section is returned to substantially fully closed position. Since the configuration is connected in series, when the throttle operation part is returned to fully closed while driving at high speed, even if the throttle valve does not return properly, the short circuit will turn on and cause a misfire, so the engine speed will be reduced. Can be lowered automatically. Furthermore, when the engine speed drops to a certain low speed, the ignition is automatically restarted, so there is no problem in continuing to drive.

[Brief explanation of drawings]

Fig. 1 is an electric circuit diagram of a speed control device according to an embodiment of the present invention, Fig. 2 is a schematic diagram showing a throttle operation section and a carburetor of a motorcycle equipped with the same speed control device, and Fig. 3 is a view taken along the line mm in FIG. 2. ■-throttle operation section, 2-carburizer, 3--handle, 4-throttle N') section, 4a--protrusion, 7-switch, 10-flywheel generator,
11--CD I Uni Nod, 12-Ignition Coil, 13-Spark Plug, 14-Charge Coil, 1
5--pulsar coil, 20--switching circuit, 21--3CR, 23--FV converter, 24 constant voltage diode, 28--short circuit.

Claims (1)

[Claims] An ignition control circuit is provided in which a capacitive discharge type ignition unit is connected to an electromotive section consisting of a charge coil and a pulser coil driven by the crankshaft, and the ignition coil is driven by the capacitive discharge type ignition unit. A short circuit is connected in parallel to the capacitive discharge ignition unit, and this short circuit includes a switching circuit that turns on when the crankshaft rotates at high speed, and a switch that turns on when the throttle operation section is returned to substantially fully closed position. A vehicle speed control device characterized in that the following are connected in series.