JPS6229766A - Starter circuit for engine - Google Patents

Abstract

PURPOSE:To promote a cost down and obtain easy insulation from a handle, by providing an ignition circuit, which performs ignition action in an engine, while a misfiring circuit, which outputs a misfiring signal, parallelly with the ignition circuit. CONSTITUTION:A starter circuit has an ignition circuit 1, performing ignition action of an engine, and a stop switch 8, having a function to stop the ignition action by said ignition circuit 1, and the starter circuit provides a misfiring circuit 2, which outputs a misfiring signal to forcedly stop the ignition action by said ignition circuit 1, in parallel with the ignition circuit 1. //said misfiring circuit 2 has a semiconductor switching element S2 being placed in a conductive condition or non-conductive condition respectively for opening or closing of the stop switch 8 serving as a control input signal. In this way, the starter circuit promotes a cost down while obtains also easy insulation from a handle.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an engine starting circuit for starting the engines of automobiles, motorcycles, etc.

(Prior art) Conventionally, engine starting circuits for motorcycles and other vehicles have been equipped with a stop switch, a so-called kill switch, that forcibly stops the engine, in order to prevent the engine from running at high speeds due to no load, which occurs when the motorcycle falls over. Equipped with

However, if the driver forgets to turn the kill switch back on and continues to drive the starter motor in the off state, the engine will not start forever and the battery will be discharged.

In order to prevent such battery discharge, for example, as shown in Japanese Utility Model Publication No. 55-52063, a starter switch (cell switch) is used to drive the starter motor, and a kill switch is used to forcibly stop the engine. There is a configuration in which the starter motor is connected in series with a switch so that the starter motor is not driven even if the starter switch is turned on when the kill switch is off.

However, the kill switch (stop switch) in this conventional device has a contact that is connected in series with the starter switch, and opens and closes in conjunction with the opening and closing of this contact, stopping the operation of the ignition system-next circuit. This requires two interlocking mechanical opening/closing switches for the contacts connected to ground, which are expensive, and since the voltage in the ignition system-next circuit is high, the latter contact requires a high withstand voltage switch. In addition, because kill switches are generally attached to the handlebars of motorcycles, the wiring needs to be highly insulated from the handlebars, which leads to high costs. It had

(Object of the invention) The present invention has been made in view of the above-mentioned conventional problems.
When the kill switch is off, even if the starter switch is turned on, the starter motor will not be driven, which prevents unnecessary discharge of the battery, and uses a single mechanical open/close switch with low withstand voltage. The purpose of the present invention is to provide an engine starting circuit that can be used at low cost.

(Structure of the Invention) The present invention includes an ignition circuit that performs an ignition operation of an engine, and a stop switch that has a function of stopping the ignition operation of this ignition circuit, and when the function of the stop switch is not activated, the starter motor is In an engine starting circuit in which a starter switch circuit for driving the engine is formed, the stop switch is composed of one contact that is closed when the function is not activated and opened when the function is activated, and is inserted in series with the starter switch circuit. Further, a misfire circuit is provided in parallel with the ignition circuit for outputting a misfire signal that forcibly stops the ignition operation of the ignition circuit, and this misfire circuit uses the opening or opening of the stop switch as a control input signal. , each consisting of a semiconductor switching element that is in a conductive state or a non-conductive state.

With this configuration, when the stop switch serving as a kill switch is turned off, the starter motor will not be driven even if the starter switch is turned on, and the misfire circuit outputs a misfire signal as an off signal for the stop switch, starting the ignition. This stops the ignition operation of the circuit.

(Embodiment) FIG. 1 shows a first embodiment of the engine starting circuit of the present invention.

In FIG. 1, 1 is an ignition circuit that causes the engine to ignite; 2 is a misfire circuit that stops the ignition operation of the ignition circuit 1, which is a feature of the present invention; 3 is a battery;
4 is a main switch which has interlocked switches 4a and 4b and is operated to supply power to the engine system;
5 is a starter motor for starting the engine; 6 is a starter relay consisting of a relay coil 6a and contacts 6b that open and close to supply electric power from the battery 3 to the starter motor 5; and 7 is a starter relay for starting the engine. The starter switch to be operated, 8 is a kill switch (stop switch) that controls the function of forcibly stopping the engine.
It is.

The ignition circuit 1 includes a charge coil L1 connected to a crankshaft (not shown) for generating electricity, a diode D1 for preventing backflow of the charge coil L1, and a diode D2 for rectifying the output of the charge coil L1. and,
A capacitor C1 that temporarily stores the rectified output from this diode D2, and a pulsar generator (not shown)
Thyristor S that is turned on in response to an ignition signal from
1, and an ignition coil L2 that causes the spark plug P to generate a spark by turning on the thyristor S1.

The misfire circuit 2 is provided in parallel with the ignition circuit 1 between the line e and the ground, and includes a thyristor 82 (semiconductor switching element) that generates a misfire signal to stop the ignition operation of the ignition circuit 1, and a bias resistor R1. , R2, chattering prevention capacitor C2, and kill switch 8.
and a backflow prevention diode D3 for grounding the gate of the thyristor S2 by closing the circuit.

The operation of the starting circuit having such a configuration will be explained.

During normal driving, the kill switch 8 is on (open)
The status is set to <RLIN side). As a result, the gate of the thyristor S2 is grounded via the diode D3, and the thyristor S2 is turned off (in a non-conducting state). When the main switch 4 is operated with the kill switch 8 set to on in this manner, one of the switches 4a is turned on and the other switch 4b is turned off. Therefore, the operation of the starter switch 7 is effective (that is, the starter switch circuit is formed), and the output line e of the charging coil L1 is cut off from the ground.
The ignition circuit 1 becomes ready for ignition operation.

In this state, when the starter switch 7 is turned on, the starter relay 6 is turned on, thereby driving the starter motor 5 to rotate. Therefore, the ignition circuit 1 performs the ignition operation, and the engine is operated.

Here, for example, if the motorcycle falls while traveling and the main switch 4 cannot be turned off, the engine may be unloaded and rotate at high speed.

In such a case, the engine can be stopped by turning off (opening) the kill switch 8. That is, when the kill switch 8 is turned off and the engine is rotating, the charge coil L of the ignition circuit 1 is turned off.
1, the resistance R1°R2 of the misfire circuit 2
The potential at the connection point becomes higher than before, and the thyristor S2 is turned on (conducted). Therefore, ignition circuit 1
The output of the charging coil L1 is short-circuited via the thyristor S2, thereby stopping the ignition operation of the ignition circuit 1 and stopping the engine. Furthermore, when the kill switch 8 is in the off state, the starter switch circuit is not formed even if the starter switch 7 is turned on, so the starter motor 5 is not driven to rotate, and therefore the battery 3 is not discharged unnecessarily. do not have.

FIG. 2 shows a second embodiment of the invention. In FIG. 2, components corresponding to those shown in FIG. 1 are given the same reference numerals. In this embodiment, a pop-out prevention circuit A is added to the first embodiment. This pop-out prevention circuit A is connected between the connection point between the switch 4a of the main switch 4 and the relay coil 6a and the ground, and is connected to a relay 9 consisting of a relay coil 9a and a contact 9b.
It has a series circuit of a relay coil 9a and a clutch switch 10, and further includes a neutral lamp 11 and a neutral lamp 11.
It has a series circuit with the cruise switch 12. Note that one end of the contact 9b of the relay 9 is connected to one end of the switch 4a, and the other end is connected to one end of the relay coil 6a of the starter relay 6. Further, a diode D4 for preventing backflow is connected between one end of the clutch switch 10 and one end of the neutral switch 12. The clutch switch 10 is turned on when the clutch is engaged, the neutral switch 12 is turned on when the transmission gear is in neutral, and the neutral lamp 11 indicates the state when the transmission gear is in neutral. It is to be displayed.

The operation of this second embodiment will be explained in a normal running state, that is, when the kill switch 8 is turned on.

(a) The clutch is engaged and the clutch switch 10 is turned on, and the neutral switch 1 is in the neutral state.
2 is turned on, when the main switch 4 is turned on, the excitation current of the relay coil 9a of the relay 9 flows to the ground via the clutch switch 10 and the neutral switch 12, and the relay 9 is turned on. This results in the same circuit as in the first embodiment, and the starter motor 5 is driven by turning on the starter switch 7.

(b) When the clutch switch 10 is turned on and the main switch 4 is turned on when the clutch switch 10 is not in the neutral state and the neutral switch 12 is turned off, the excitation 1 & current of the coil 9a of the relay 9 is transferred to the clutch switch 10.
The current flows to ground through the relay 9, and the relay 9 is turned on in the same manner as above.

(c) When the clutch is released, the clutch switch 10 is turned off, and the neutral switch 12 is turned on, when the main switch 4 is turned on, the excitation current of the relay coil 9a flows through the diode D4 and the neutral switch 12. The current flows to ground through the relay 9, and the relay 9 is turned on, as described above.

(d) Clutch switch 10 and neutral switch 1
2 are both turned off, even if the main switch 4 is turned on, the relay coil 9a of the relay 9 is energized! ! Since no current flows, the relay 9 is not turned on and the starter switch circuit is not formed, so even if the starter switch 7 is turned on, the starter motor 5 is not driven.

In other words, if the clutch is released and the transmission gear is not in the neutral state, even if the starter switch 7 is turned on,
The engine will not be started and the two-wheeled vehicle will be prevented from flying out.

Note that when the kill switch 8 is turned off, the engine is stopped as described in FIG.

FIG. 3 shows a third embodiment of the invention. In FIG. 3, components corresponding to those shown in FIG. 2 are given the same reference numerals. This embodiment is obtained by adding a stand state detection circuit B to the second embodiment.

This stand state detection circuit B is connected between the kill switch 8 and the clutch switch 10, and the stand switch 13 which is interposed between the cathode of the diode D3 of the misfire circuit 2 and one end of the kill switch 8; A backflow blocking diode D5 connected between the stand switch 13 and the clutch switch 10 and the relay coil 14
a is switch 4a of main switch 4 and diode D4
The relay 14 is connected between the cathodes of the stand switch 13 and the contact 14b is connected in parallel to the stand switch 13. The stand switch 13 is used to detect whether the side stand that stands when the motorcycle is stopped is raised or lowered.

Raising the key turns it on, and lowering it turns it off.

The operation of the engine starting circuit of this third embodiment will be explained with reference to the logic circuit shown in FIG. Here, it is assumed that the main switch 4 is turned on.

(a) The conditions for the ignition circuit 1 to perform the ignition operation are that the kill switch 8 is turned on (Fig. 4A), the neutral switch 12 is turned on (Fig. 4 Exit), or the stand switch 13 is turned on (Fig. 4). This is the case when is turned on (to Fig. 4). That is, when the kill switch 8 and the stand switch 13 are turned on, the thyristor S of the misfire circuit 2
Since the ignition circuit 2 is turned off, the ignition circuit 1 can be operated at full power.

On the other hand, when the kill switch 8 and the neutral switch 12 are turned on, the relay coil 14 of the relay 14
An excitation current flows through a, thereby turning on the contact 14b. Therefore, in this case as well, the ignition circuit 1 can perform the ignition operation.

Conversely, a misfire operation is also performed when the kill switch 8 is turned off, when the transmission gear is set to a position other than neutral, or when the side stand is lowered.

(1)) The conditions for driving the starter motor 5 are as follows:
Either the kill switch 8 is turned on (FIG. 4 2) and the neutral switch 12 is turned on (FIG. 4 E), or the stand switch 13 and the clutch switch 10 are turned on.
This is the case when is turned on (see Figure 4). That is,
When kill switch 8 is turned on and neutral switch 12 is turned on, relay 9 is turned on. Therefore, when a starter circuit is formed and the starter switch 7 is turned on, the starter motor 5 is driven. Further, when the starter switch 7 is turned on while the kill switch 8 is turned on and the stand switch 13 and clutch switch 10 are turned on, the starter motor 5 is driven.

Conversely, when the kill switch 8 is turned off, the starter motor 5 cannot be driven. Furthermore, the starter motor 5 cannot be driven even when the kill switch 8 is on, the transmission gear is set to a position other than neutral, the side stand is down, or the clutch is released. become unable. Therefore, it is possible to prevent the two-wheeled vehicle from flying out and from running with the side support stand lowered.

(Effects of the Invention) As described above, according to the present invention, the stop switch having the function of stopping the ignition operation of the ignition circuit is composed of one contact that opens when the function is not activated and circuits when the function is activated. By inserting this stop switch in series with the starter switch circuit, when this stop switch is in the circuit (off) (when the above function is activated), the starter motor will not be driven even if the starter switch is turned on. It is possible to prevent unnecessary discharge of the battery.

Moreover, by providing in parallel with the ignition circuit a misfire circuit having a semiconductor switching element that becomes conductive (misfire signal generation) or non-conductive in response to the opening or closing of the stop switch as a control input signal, the stop switch can be used as the stop switch. , there is no need for two interlocking mechanical opening/closing switches, one for connecting in series with the starter switch and the other for connecting to the ground to stop the ignition circuit operation, as in the past. Since only one mechanical opening switch with a low withstand voltage is required, costs can be reduced and insulation from the handle can be easily achieved.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram of an engine starting circuit according to a first embodiment of the present invention, FIG. 2 is an electric circuit diagram of a second embodiment of the present invention, and FIG. FIG. 4 is an explanatory diagram showing the logical operation of the starting circuit shown in FIG. 3. DESCRIPTION OF SYMBOLS 1... Ignition circuit, 2... Misfire circuit, 5... Starter motor, 7... Starter switch, 8... Kill switch (stop switch), S2... Thyristor (semiconductor switching element).

Claims (1)

[Claims] 1. A starter switch that has an ignition circuit that performs the ignition operation of the engine and a stop switch that has the function of stopping the ignition operation of this ignition circuit, and that drives the starter motor when the function of the stop switch is not activated. In the engine starting circuit in which the circuit is formed, the stop switch has one contact that is closed when the function is not activated and is opened when the function is activated, and is inserted in series with the starter switch circuit, and further includes the ignition circuit. A misfire circuit that outputs a misfire signal that forcibly stops the ignition operation of the ignition circuit is provided in parallel with the ignition circuit, and this misfire circuit uses the opening or closing of the stop switch as a control input signal to control the conduction state or non-conduction state, respectively. An engine starting circuit characterized by comprising a semiconductor switching element that changes states.