JPH0320224Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for ensuring the safety of a two-wheeled vehicle equipped with a side stand.

[Prior Art] The side stand of a two-wheeled vehicle projects diagonally downward to support the vehicle body with the wheels on the ground, so the two-wheeled vehicle can run even with the side stand down. If a two-wheeled vehicle is driven with the side stand down, there is a risk that when the side stand comes into contact with the road surface, the vehicle will fall over, resulting in an accident resulting in injury or death. Conventionally, in order to prevent such accidents, a device has been proposed that is equipped with a detector that detects the position of the side stand and lights up a lamp to issue a warning when the side stand is down.

However, in this case, if the driver fails to notice that the lamp is lit and starts the engine, the motorcycle will continue to run with the side stand down, making it impossible to completely prevent accidents.

Therefore, as seen in Special Publication No. 59-24030,
An ignition blocking thyristor is connected in parallel to both ends of the power generation coil (exciter coil) of a capacitor discharge type ignition device that ignites the internal combustion engine that drives the motorcycle, and the ignition blocking thyristor is turned on when the side stand is down. A safety device has been proposed that short-circuits the output of the power generating coil to prevent ignition.

[Problem to be solved by the invention] However, in the above safety device, the ignition blocking thyristor was connected in parallel to the power generation coil, so the capacitor of the ignition device is already charged while driving. When the side stand is lowered, it is impossible to prevent the already charged capacitor from discharging into the primary coil of the ignition coil and igniting the engine.
There was a problem that it was not possible to cause the engine to misfire immediately, and there was a delay in the activation of the safety device.

Furthermore, in the conventional safety device, the generating coil of the magnetic generator that serves as the power source for the ignition device is short-circuited by the ignition blocking thyristor, so it is unavoidable that the generating coil ignites a large amount. Therefore, it was necessary to increase the insulation class of the generator coil, which caused the problem of increasing the cost of the generator. Further, when the output of the generating coil is short-circuited by an ignition blocking thyristor, the thyristor generates a large amount of heat, so it is necessary to use an expensive thyristor with a large capacity.

The purpose of the present invention is to solve the above-mentioned problems of the conventional safety device by providing an ignition blocking thyristor so that the discharge current of the capacitor of the ignition device is diverted from the primary coil of the ignition coil.
Our objective is to provide a safety device for wheeled vehicles.

[Means for Solving the Problems] The present invention provides a capacitor that includes a capacitor provided on the primary side of an ignition coil and a circuit that discharges the electric charge of the capacitor to the primary coil of the ignition coil at the ignition timing of an internal combustion engine. A safety device for a two-wheeled vehicle whose drive source is an internal combustion engine ignited by a discharge type ignition device, in which the discharge current of the capacitor of the ignition device is directed in a direction that bypasses the primary coil when conductive. , an ignition blocking thyristor connected in parallel to both ends of the primary coil, a stand position detection switch for detecting the position of the side stand of the two-wheeled vehicle, and detecting whether or not the transmission of the two-wheeled vehicle is in the neutral position. The ignition system fires when the stand position detection switch detects that the side stand is down while the neutral position detection switch and the neutral position detection switch detect that the transmission is in a position other than neutral. and an ignition-preventing thyristor trigger circuit that triggers the ignition-preventing thyristor to prevent the ignition.

[Function] With the above configuration, when the transmission is in a position other than neutral and the side stand is down, the ignition operation is blocked, causing the engine to misfire and stop. It is possible to prevent a fall accident from occurring when the two-wheeled vehicle starts running.

Further, as in the present invention, if an ignition blocking thyristor is connected in parallel to the primary coil of the ignition coil, and the conduction of the thyristor causes the discharge current of the capacitor of the ignition device to be bypassed from the primary coil,
When the two-wheeled vehicle is running with the transmission set to a position other than neutral, and the side stand is lowered due to vibrations, etc., the engine will immediately misfire and stop, so if the side stand is lowered, the engine will immediately misfire and stop. This can prevent the vehicle from continuing to run.

Furthermore, with the above configuration, even if the side stand is down, the engine can be operated when the transmission is in the neutral position, so starting the engine will not be hindered.

Furthermore, with the configuration of the present invention, the ignition blocking thyristor only allows the discharge current of the capacitor to flow for an extremely short duration, so the heat generation of the ignition blocking thyristor can be reduced compared to the case where the generating coil is short-circuited. Therefore, a thyristor with a small capacity can be used as the thyristor.

Furthermore, since the generating coil of the magnet generator is not short-circuited in this invention, the heat generation of the generating coil can be reduced compared to the method of short-circuiting the generating coil, and the insulation class of the generating coil can be lowered to reduce costs. can be achieved.

[Embodiments] Examples of the present invention will be described below with reference to the accompanying drawings.

FIG. 1 shows the overall configuration of an embodiment of the present invention. In the figure, 1 is an ignition device for igniting an internal combustion engine that drives a two-wheeled vehicle, and 2 is a safety device of the present invention.

The ignition device 1 for an internal combustion engine includes an ignition coil 101,
Ignition energy storage capacitor 102, discharge control thyristor 103, and damper diode 10
4. Exciter coil 105, capacitor charging diode 106, signal coil 107, signal supply diode 108, and spark plug 109
This is a well-known capacitor discharge type ignition device consisting of. The exciter coil 105 is disposed within a magnet generator driven by an internal combustion engine, and induces an alternating current voltage in synchronization with the rotation of the engine. Due to the positive half cycle output voltage of this exciter coil 105, the exciter coil 105 → diode 106
The capacitor 102 is charged to the polarity shown in the figure along the path of → capacitor 102 → diode 104 and primary coil 101a of ignition coil 101 → exciter coil 105. The signal coil 107 is provided in a signal generator using the rotor of a magnet generator provided with the exciter coil 105 or in a signal generator provided separately from the magnet generator, and this signal coil controls the ignition timing of the engine. An ignition signal is given to the thyristor 103 through the diode 108.

When a firing signal is given to the thyristor 103,
The thyristor 103 to which the terminal voltage of the capacitor 102 is applied between the anode and the cathode in the forward direction becomes conductive, and the charge of the capacitor 102 is transferred to the thyristor 1.
03 and the primary coil 101a of the ignition coil 101
discharge through. Due to the discharge of this capacitor, a primary voltage V 1 is induced in the primary coil 101a of the ignition coil in the direction of the arrow shown in the figure, and this voltage _{V 1 is} induced,
This voltage is further boosted, and a high voltage for ignition is induced in the secondary coil 101b. This high voltage is applied to the spark plug 109 attached to the cylinder of the engine, so a spark is generated in the spark plug and the engine is ignited.

The safety device 2 includes an ignition blocking thyristor 201 connected in parallel to the primary coil 101a of the ignition coil 101 with the anode facing the ground side, and a thyristor 201 connected when a predetermined condition is satisfied.
Thyristor trigger circuit 2 for ignition prevention that triggers
It consists of 02.

FIG. 2 shows the configuration of the safety device when the damper diode 104 is not provided in the capacitor discharge type ignition device 1. In this case, the ignition blocking thyristor 201 is a diode that performs the same function as the damper diode 104. It is connected in parallel to both ends of the primary coil 101a of the ignition coil 101 via 203.

Various embodiments embodying the configuration of the ignition blocking thyristor trigger circuit 202 will be described below with reference to FIGS. 3 to 5. In each of the embodiments shown in FIGS. 3 to 5, a clutch position detection switch for detecting the position of the clutch of a two-wheeled vehicle is provided in the ignition blocking thyristor trigger circuit 202, but in the present invention, at least It is sufficient to have a stand position detection switch for detecting the position of the side stand and a neutral position detection switch for detecting whether or not the transmission is in the neutral position. Of course, the detection switch may be removed.

In the embodiment shown in FIG. 3, one end of a stand position detection switch _SW1 is connected to the anode of the ignition blocking thyristor 201, and the other end of this detection switch is connected to the gate of the thyristor ₂₀₁ through a resistor R1. In addition, a neutral position detection switch is installed between the gate cathode of the thyristor 201.
SW ₂ and clutch position detection switch SW ₃ are connected in parallel. In this embodiment, a stand position detection switch _SW1 , a resistor _R1 , a neutral position detection switch _SW2 , and a clutch position detection switch _SW3 constitute an ignition blocking thyristor trigger circuit. The configuration of the ignition device 1 is completely similar to the embodiment shown in FIG.

In the embodiment shown in FIG. 3, the stand position detection switch SW ₁ closes when the side stand of the two-wheeled vehicle is down or even slightly about to go down from the normal retracted position, and the stand position detection switch SW 1 closes when the side stand of the two-wheeled vehicle is lowered or even slightly about to go down than the normal retracted position, and when the side stand reaches the normal retracted position. It is designed to open when it is on. As such a detection switch, for example, a limit switch that is activated and opened when the side stand is raised to the normal retracted position can be used. The neutral position detection switch _SW2 is provided so as to close when the transmission is in a neutral position and open when the transmission is in a position other than neutral. This neutral position detection switch _SW2 can be, for example, a limit switch that operates and closes when the operating member of the transmission is in the neutral position. Further, a clutch position detection switch _SW3 is provided so as to close when the clutch is disengaged and open when the clutch is engaged. This clutch position detection switch can also be constituted by a limit switch that is interlocked with the operating member of the clutch.

The stand position detection switch SW ₁ , the neutral position detection switch SW ₂ and the clutch position detection switch SW ₃ may be either contact switches or non-contact switches.

In the embodiment shown in FIG. 3, when the two-wheeled vehicle is in a state where it is possible to travel, that is, when the transmission is in a position other than neutral and the clutch is engaged, the neutral position detection switch _SW2 is opened and the clutch position is Detection switch SW ₃ is open. In this state, if the side stand is down or is about to go down, the stand position detection switch SW ₁ is closed, so the capacitor 102 is activated at the engine ignition timing.
The primary coil 10 of the ignition coil 101 due to the discharge of
At the same time that the primary voltage V ₁ in the direction of the arrow shown in the figure is induced in 1a, an ignition signal is supplied to the ignition blocking thyristor 201 through the stand position detection switch SW ₁ and the resistor R ₁ , and the thyristor 201 becomes conductive. Therefore, this ignition blocking thyristor 20
1 short-circuits the primary voltage V ₁ and prevents a high voltage for ignition from being induced in the secondary coil 101b of the ignition coil. This causes the engine to misfire, making it impossible for the two-wheeled vehicle to run.

On the other hand, when the transmission is in the neutral position and detection switch SW ₂ is closed, or when the clutch is disengaged and detection switch SW ₃ is closed, the side stand is down and stand position detection switch SW ₁ is closed. Thyristor 2 even when closed
Since no ignition signal is supplied to the thyristor 201, the thyristor 201 is not triggered and the engine is ignited normally. Furthermore, when the side stand is up and the stand position detection switch SW ₁ is open, no firing signal is supplied to the thyristor 201 no matter what state the transmission and clutch are in.
The thyristor 201 is not triggered and the engine operates normally.

Next, in the embodiment of FIG. 4, the thyristor 2
The collector and emitter of an NPN transistor TR ₁ are connected to the gate and cathode of thyristor 201, respectively, and a series circuit of a resistor R ₁ and a stand position detection switch SW ₁ connects the detection switch SW ₁ to the thyristor 201 between the gate and anode of the thyristor 201. connected to the anode (ground) side of the One end of a resistor _R2 is connected to the base of the transistor _TR1 , and the other end of the resistor _R2 is connected to the thyristor 20.
Between the anode (ground) of 1 and the neutral position detection switch SW ₂ and the clutch position detection switch
SW ₃ is connected in parallel. In this example, transistor TR ₁ , resistor R _1, resistor R ₂ and detection switch
_SW1 to _SW3 constitute an ignition blocking thyristor trigger circuit 202.

In the embodiment of FIG. 4, the detection switches SW ₁ to
The operation of SW ₃ is similar to the embodiment shown in Fig. 3, and the stand position detection switch SW ₁ is closed when the side stand is down, and when the transmission is in a position other than neutral and when the clutch is engaged. The neutral position detection switch SW ₂ and the clutch position detection switch SW ₃ are respectively open.
In this way, when the stand position detection switch SW ₁ is closed and both the neutral position detection switch SW ₂ and the clutch position detection switch SW ₃ are open, no base current is supplied to the transistor TR ₁ , and the transistor TR ₁ is Because it is in a blocked state,
1 to the ignition coil 11 primary coil 101a at the ignition timing.
At the same time that the next voltage V ₁ is induced, an ignition signal is supplied to the thyristor 201 through the detection switch SW ₁ and the resistor R ₁ , thereby making the thyristor 201 conductive and preventing the ignition operation.

In contrast, the neutral position detection switch
If either SW ₂ or clutch position detection switch SW ₃ is closed, the primary coil 1 of the ignition coil
At the same time as the primary voltage V ₁ is induced in 01a, a base current is supplied to the transistor TR ₁ through the switch SW ₂ or SW ₃ and the resistor R ₂ and the transistor becomes conductive, so that the gate and cathode of the thyristor 201 are short-circuited. . Therefore, in this state, even if the stand position detection switch _SW1 is closed, the thyristor 201 is not triggered and the engine operates normally.

According to the embodiment of FIG. 4, the detection switches SW ₁ to
Since one end of each SW ₃ can be grounded, a detection switch whose case is a ground terminal can be used.

Next, in the embodiment shown in FIG. 5, the cathode of a diode _D1 is connected to the base of a transistor _TR1 provided similarly to the embodiment of FIG. 4 via a resistor _R2 , and the anode of this diode teeth
Connected to the collector of PNP transistor TR ₂ . One end of a resistor _R3 is connected to the base of the transistor _TR2 , and a neutral position detection switch _SW2 is connected between the other end of the resistor _R3 and ground. The emitter of the transistor _TR2 is connected to the positive electrode of a battery B whose electrode is grounded, and a lamp L is connected between the emitter of the transistor _TR2 and the non-grounded terminal of the neutral position detection switch _SW2 . Further, the cathode of a diode _{D2 is connected to the connection point between the resistor R2 and the cathode of the diode D1 , and} a clutch position detection switch _SW3 is connected between the anode of the diode _D2 and ground. In other respects, the structure is similar to that of the embodiment shown in FIG. In the embodiment shown in FIG. 5, an ignition blocking thyristor trigger circuit 202 is constituted by transistors TR ₁ and TR ₂ and detection switches SW ₁ to SW ₃ . This constitutes a display circuit that indicates that the transmission is in the neutral position.

The operation of the detection switches _SW1 to _SW3 in the embodiment of FIG. 5 is the same as in the embodiments of FIGS. 3 and 4, and when the transmission is in a position other than neutral and when the clutch is engaged, , the neutral position detection switch SW ₂ and the clutch position detection switch SW ₃ are open. In this state, no base current is supplied to transistors TR ₁ and TR ₂ , so these transistors are kept in a cut-off state. In this state, when the side stand is down and the stand position detection switch SW ₁ is closed, when the primary voltage V ₁ is induced in the primary coil 101a of the ignition coil, the thyristor 201 is simultaneously triggered and the ignition operation is blocked. .

On the other hand, when the transmission is in the neutral position and the neutral position detection switch SW ₂ is closed, the transistor TR ₂ conducts and supplies the base current to the transistor TR ₁ , so that a primary voltage V ₁ is induced in the ignition coil. Then the transistor TR ₁
conducts, shorting the gate and cathode of the ignition blocking thyristor 201. Furthermore, even when the clutch is disengaged and the clutch position detection switch _SW3 is closed, the primary voltage _V1 is induced in the ignition coil and at the same time, the base current is applied to the transistor _TR1 , so this transistor _TR1 conducts and the thyristor The gate and cathode of 201 are short-circuited. When the gate and cathode of the thyristor 201 are short-circuited when the primary voltage is induced in the ignition coil, even if the side stand is down and the stand position detection switch SW ₁ is closed, the thyristor 201 Since no ignition signal is applied, the thyristor 201 is not conductive and the engine operates normally.

Further, in the embodiment shown in FIG. 5, when the transmission is in the neutral position and the neutral position detection switch SW ₂ is closed, the lamp L lights up, and the transmission is in the neutral position and the side stand is down. This indicates that the engine can be started even if the engine is turned on.

In each of the above embodiments, stand position detection switch SW ₁ closes when the side stand is down,
It is assumed that the neutral position detection switch SW ₂ and the clutch position detection switch SW ₃ are opened when the transmission is in a position other than neutral and when the clutch is engaged, respectively, but the state of each detection switch is determined by each detection switch. The operating modes of the detection switches SW ₁ to _{SW 2} are not limited to those shown in the above embodiments, and can be reversed arbitrarily by activating the switch circuit. SW ₁ ,
The neutral position detection switch _SW2 and the clutch position detection switch _SW3 may each be switches that assume different states when the states of the side stand transmission and the clutch differ.

Further, in the above embodiment, a capacitor discharge type ignition device is used in which the ignition operation is performed by triggering the discharge control thyristor 103 by the output of the signal coil 107, but the configuration of this ignition device is Optional. For example, signal coil 1
A capacitor discharge type ignition device that uses the negative cycle output of the exciter coil 105 without using the exciter coil 105 to provide a trigger signal to the thyristor 103, and an ignition device that triggers the thyristor 103 using an electronically controlled ignition timing control circuit. The present invention can also be applied when Furthermore, the present invention can be similarly applied when a current interrupt type ignition device is used.

[Effects of the invention] As described above, according to the invention, when the transmission is in a position other than neutral and the side stand is down, the engine misfires and is stopped by blocking the ignition operation. Therefore, it is possible to prevent a fall accident caused by the two-wheeled vehicle starting to run with the side stand down.

Further, according to the present invention, the ignition blocking thyristor is connected in parallel to the primary coil of the ignition coil, and the conduction of the thyristor causes the discharge current of the capacitor of the ignition device to be bypassed from the primary coil. When the two-wheeled vehicle is running with the transmission set to a position other than neutral and the side stand is lowered due to vibration, etc., the engine can be immediately misfired and stopped, and the engine can be stopped even if the side stand is lowered. It is possible to prevent the vehicle from continuing to drive in such a state.

Furthermore, according to the present invention, even if the side stand is down, the engine can be operated when the transmission is in the neutral position, so there is no problem in starting the engine.

Furthermore, according to the present invention, since the ignition blocking thyristor only allows the discharge current of the capacitor to flow for an extremely short duration, the heat generation of the ignition blocking thyristor can be reduced compared to the case where the generating coil is short-circuited. There is an advantage that a thyristor with a small capacity can be used as the thyristor.

Furthermore, according to the present invention, since the generating coil of the magnet generator is not short-circuited, the heat generation of the generating coil can be reduced compared to a method in which the generating coil is short-circuited, and the insulation class of the generating coil is lowered, resulting in cost savings. This has the advantage that it is possible to reduce the

[Brief explanation of the drawing]

Figures 1 and 2 are circuit diagrams showing the basic configuration of different embodiments of the present invention, and Figures 3 to 5 each show different specific embodiments embodying the basic configuration of Figure 1. FIG. 1...Ignition device, 101...Ignition coil, 10
1a...Primary coil, 102...Capacitor, 1
03...Discharge control thyristor, 105...Excital coil, 107...Signal coil, 2...
Safety device, 201... Thyristor for ignition prevention, 2
02...Ignition blocking thyristor trigger circuit, SW ₁
...Stand position detection switch, SW ₂ ...Neutral position detection switch, SW ₃ ...Clutch position detection switch, TR ₁ , TR ₂ ...Transistor,
_R1 to _R3 ...Resistance, _D1 , _D2 ...Diode.

Claims (1)

[Scope of Claim for Utility Model Registration] A capacitor discharge type ignition device having a capacitor provided on the primary side of an ignition coil and a circuit that discharges the electric charge of the capacitor to the primary coil of the ignition coil at the ignition timing of an internal combustion engine. A safety device for a two-wheeled vehicle using an internal combustion engine to be ignited as a driving source, wherein the primary coil is directed in a direction in which a discharge current of a capacitor of the ignition device is bypassed from the primary coil when conductive. an ignition blocking thyristor connected in parallel to both ends of the coil; a stand position detection switch that detects the position of a side stand of the two-wheeled vehicle; and a neutral position that detects whether the transmission of the two-wheeled vehicle is in a neutral position. a detection switch; and when the stand position detection switch detects that the side stand is down while the neutral position detection switch detects that the transmission is in a position other than neutral, the ignition device is activated. and an ignition blocking thyristor trigger circuit that triggers the ignition blocking thyristor to prevent the ignition operation of the two-wheeled vehicle.