KR0139503B1 - Start inhibition control system for a motorcycle - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oscillation suppression apparatus for an automatic two-wheeled vehicle which suppresses oscillation of the automatic two-wheeled vehicle when the transmission is set to a position other than neutral when the side stand is not stored. A side stand position detecting means (2) for detecting a state, and a shift position detecting means (4) for detecting that the transmission (3) is set other than the neutral position, and the crank angle sensor (6) in the ignition unit (16). Stall rotation speed detection means 9 for detecting that the rotation speed of the engine 7 has reached the rotation speed to which the automatic centrifugal clutch 8 is connected, based on the detection output 6a of " If the transmission 3 is in the non-neutral position while the side stand is in the non-receiving state, and it is detected by the oscillation suppression state detecting means 10 that the rotational speed of the engine 7 rises to such a degree that the clutch connection is made, the ignition control The device 11 performs misfire control to reduce the ignition of the engine 7 to suppress the increase in the rotational speed of the engine 7.

Description

Oscillation Inhibitor of Automatic Two-wheeled Vehicle

1 is a block configuration diagram of an oscillation suppression apparatus of a motorcycle according to the present invention.

2 is a circuit diagram showing an example of one embodiment of the oscillation suppression apparatus by misfire control in the present invention.

3 is a circuit diagram showing another specific example of the oscillation suppression apparatus by misfire control in the present invention.

4 is a time chart showing the operation of the oscillation suppression apparatus by ignition cycle control in the present invention.

5 is a block diagram of the oscillation suppression apparatus for limiting the opening degree of the throttle valve in the present invention.

6 is a block diagram of the oscillation suppression apparatus for limiting the intake air amount of the engine in the present invention.

* Explanation of symbols for main parts of the drawings

1, 21, 51, 61, 81: Oscillation suppressor 2, 22: Side stand position detecting means

3: transmission 4, 24: shift position detecting means

5: Non-storage oscillation possible state detection means 6: Crank angle sensor

7: Engine 8: Automatic centrifugal clutch

9: Stall rotation speed detecting means 11, 31, 55: ignition control circuit

16, 26, 56: Ignition unit constituting the engine speed limit means

33,52: Ignition and misfire control circuit

64: actuator driving means constituting the engine rotational speed control means

65: throttle valve 66, 85: engine speed limiting means

83: air limit valve 84: air limit valve drive means

The present invention relates to an automatic two-wheeled vehicle equipped with an automatic centrifugal clutch, wherein the automatic centrifugal clutch is connected to the engine speed when the transmission is not in a neutral (neutral) position and the side stand is not stored. An oscillation suppression apparatus for a braking two-wheeled vehicle which suppresses oscillation by maintaining at a rotational speed not yet provided.

When the side stand is in the upright position, the engine can be started and warmed up, but an oscillation suppression device is disclosed in Japanese Unexamined Patent Publication No. 4-8274, which prevents the side stand from being damaged by making it impossible to start the motorcycle. have.

Such a conventional oscillation suppression device has a misfire control circuit which keeps the rotational speed of the engine (internal combustion engine) from rising above the speed at which the automatic clutch is connected by causing the ignition device to fire when the parking brake is released or the side stand is in the standing position. Equipped.

Therefore, even if the side stand is in the standing state, when the parking brake is in the open state, it is possible to check the state of the engine by increasing the rotational speed of the engine to a speed higher than the speed at which the automatic clutch is connected by operating the Excel.

On the other hand, in a vehicle equipped with an automatic centrifugal clutch, the vehicle does not start when the transmission is in the neutral (neutral) position even when the side stand is standing up (not stored). Regardless of the above condition, the engine can be checked by operating the excel, and when the transmission is popular (non-neutral), the engine's rotation speed is controlled so as to prevent the vehicle from starting. It is preferable.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and even when the dedicated parking brake and the detection switch interlocked therewith are suppressed, the vehicle is suppressed while the side stand is not stored and the transmission is in the neutral position. In this case, an object of the present invention is to provide an oscillation suppression device for an automatic two-wheeled vehicle that can check an engine state by operating an Excel.

In order to solve the above problems, an oscillation suppression apparatus for a two-wheeled vehicle according to the present invention includes side stand position detecting means for detecting that the side stand is in a non-receiving position, and shift position detecting means for detecting that the transmission is outside the neutral position. And based on the detection outputs of the side stand position detecting means and the shift position detecting means, when the side stand is in a non-receiving state and the transmission is detected to be outside the neutral position, the rotation speed of the engine is less than the speed at which the automatic centrifugal clutch is connected. It characterized in that it is provided with an engine speed limit means for controlling the rotation speed of the engine to be.

The engine rotation speed suppressing means may be constituted by an ignition control circuit having a misfire control function for reducing ignition of the engine.

When the transmission is in a position other than neutral in the state where the side stand is not stored, the engine rotation speed suppressing means suppresses the rotation speed of the engine to be less than the speed at which the automatic centrifugal clutch is connected.

Therefore, oscillation of the motorcycle is suppressed in the non-storage state of the side stand. In addition, even if the side stand is in a non-retained state, when the transmission is in the neutral position, the engine speed can be confirmed by increasing the engine speed by an Excel operation.

In addition, the engine rotation speed can be suppressed by reducing the ignition of the engine by using an ignition control circuit having a misfire control function. In addition, since the misfire control function can be configured by using another circuit in the ignition unit, a space for attaching a new circuit for oscillation control, etc. is unnecessary.

EMBODIMENT OF THE INVENTION Below, the Example of this invention is described based on an accompanying drawing.

1 is a block configuration diagram of an oscillation suppression apparatus of a motorcycle according to the present invention.

The oscillation suppression apparatus 1 includes a side stand position detecting means 2 and a transmission 3 which generate, for example, a non-ceiling detection output 2a of H level when the side stand (not shown) is in a non-receiving state. When the shift position (gear position) other than the neutral position is present, for example, the shift position detecting means 4 for generating the non-neutral detecting force 4a of H level and the detection means 2 and 4 are detected. When the side stand is in the non-receiving state based on the outputs 2a and 4a, and the transmission 3 is set to the non-neutral position, for example, the H-level non-receivable oscillation possible state detection output 5a. Rotational speed (revolutions per unit time) of the engine 7 based on the non-receivable oscillation possible state detecting means 5 for generating () and the ignition timing detection output 6a of the crank angle sensor (pulser) 6 Speed (stall rotation speed) to which the automatic centrifugal clutch 8 is connected, or between idol rotation speed and stall rotation speed The stall rotation speed detection means 9 for detecting that the preset rotation speed has been reached, for example, generating the detection output 9a of the H level, and the detection output 5a of the non-receivable oscillation state detection means 5. ) And the oscillation suppression state detecting means 10 for detecting that the oscillation is in a state for suppressing oscillation based on the detection output 9a of the stall rotation speed detecting means 9 and the oscillation suppression state of the oscillation suppression state detecting means 10. The ignition control circuit 11 is configured to perform misfire control such that the rotational speed of the engine 7 does not exceed the stall rotational speed of the automatic centrifugal clutch 8 based on the request signal 10a.

The ignition control circuit 11 detects 6a of the crank angle sensor 6 supplied to the ignition timing input terminal 11b when the oscillation suppression request signal 10a is not supplied to the misfire control input terminal 11a. ), The current flowing through the primary winding 12a of the synchronous transformer ignition transformer 12 is interrupted, and a high voltage for ignition is generated in the secondary winding 12b to ignite the spark plug 13. When the oscillation suppression request signal 10a is applied, the ignition control circuit 11 reduces the series of high-pressure generating operations synchronized with the detection output 6a of the crank angle sensor 6 (fire control). The ignition is controlled so that the rotation speed of 7) does not exceed the stall speed.

In addition, the ignition control circuit 11 uses a CDI method (capacitance discharge type) in which charges charged in the large-capacity capacitor disposed in the primary circuit are discharged in accordance with the ignition timing. The power supply circuit 14 rectifies AC generation power supplied from an ACG (AC generator) 15 driven by the rotational output of the engine 7, for example, an exciter coil, and the like. ) Is supplied to each circuit part in the ignition unit 16.

With the above configuration, the oscillation suppression apparatus 1 shown in FIG. 1 has the non-receivable oscillation state detection output 5a when the side stand is not accommodated and the transmission 3 is set outside the neutral position. Is outputted, and in this state, when the rotational speed of the engine 7 tries to rise above the stall rotational speed, the oscillation suppression state detection means 10 is based on the detection output 9a of the stall rotational speed detection means 9. The oscillation suppression request signal 10a is supplied to the ignition control circuit 11. When the oscillation suppression request signal 10a is supplied, the ignition control means 11 performs misfire control, so that the rotation speed of the engine 7 becomes equal to or less than the stall rotation speed. For this reason, oscillation in the state which does not accommodate a side stand is suppressed.

In addition, the engine 7 does not stop even when the side stand is raised by standing in the state of the gear (non-neutral position), and even when the Excel is operated in that state, the two-wheeled vehicle does not start, for example, After temporary parking, the side stand can be forgotten and the oscillation can be prevented.

In addition, when the transmission 3 is set to the neutral position, the oscillation is not suppressed. Therefore, the engine 7 is operated at the neutral position to increase the rotational speed of the engine 7 to check the state of the engine 7. It is possible to do

2 is a circuit configuration diagram showing an example of one example of an oscillation suppression apparatus composed of a discrete circuit.

The oscillation suppression apparatus 21 includes a side stand position detecting means 22 composed of a switch S1 having a single circuit and a two-contact configuration, and a shift position detecting means 24 composed of a switch S2 having a single-circuit one-contact configuration. And a non-receivable oscillation possible state detecting means 25 constituted by wired logic (circle logic) and an ignition unit 26.

The switch S1 of the side stand position detecting means 22 is configured to interlock in accordance with storage and non-storage of the side stand (not shown). In a state where the side stand is not stored, the grounded common terminal S1c and one terminal S1a are connected, and the side stand indicator lamp disposed on the display panel of the motorcycle, etc., from the battery's positive power source B +. A current is supplied to L1, and this lamp L1 is turned on to visually display the side stand out.

When the switch S2 of the shift position detecting means 24 is in the neutral position in conjunction with the shift position of the transmission 3 shown in FIG. 1, the switch is in a closed state, and the switch is opened in other shift positions. It is configured to be. One terminal S2a of the switch S2 is grounded, and the other terminal S2b is connected to the positive electrode power source B + of the battery through the diode D1 and the neutral indicator lamp L2, and the display panel at the neutral position. The neutral indicator lamp L2 disposed on the back is turned on.

The control terminal DC power supply VC is supplied to the other terminal S1b of the switch S1 through the pull-up resistor R1 in the ignition unit 26 and the switch S2 terminal 2b through the diode D2. By connecting to it, the non-receivable oscillation possible state detection means (end circuit) 25 by wired logic (dashed logic) is constituted. For this reason, when the side stand is in the non-retaining position and the shifting position is other than the neutral, the output (non-receivable oscillation state detection output) 25a of the wired end circuit 25 becomes H level.

In addition, the diode D2 is for preventing the battery power source B + from returning to the ignition unit 26 side, and the diode D1 is for preventing the control DC power source VC from returning to the battery power source B + side. It is for.

The ignition unit 26 includes a power supply circuit 30, an ignition control circuit 31, an oscillation suppression state detecting means 32, an ignition and misfire control circuit 33 for controlling ignition and misfire, and waveform shaping. And a circuit 34 and stall rotation speed detecting means 35.

The power supply circuit 30 includes a diode 30a for half-wave rectifying the alternating current power supplied from the exciter coil (not shown) to the power input terminal 26a on the anode side, a current limiting resistor 30b, and a constant voltage diode ( It consists of a series circuit of 30c and the power supply smoothing capacitor 30d connected in parallel with the constant voltage diode 30c, and supplies rectified smoothing and voltage stabilized control DC power supply VC.

The ignition control circuit 31 consists of a charge / discharge circuit 36 and a thyristor drive circuit 37.

The charge / discharge circuit 36 includes a diode 36a for half-wave rectifying the alternating current power supplied to the power input terminal 26a, a large-capacity capacitor 36b that is charged with a half-wave rectified current to accumulate charge for high voltage generation, and It consists of the thyristor 36c for rapidly discharging the electric charge of the large capacity capacitor 36b. The ignition transformer connection terminal 26b is connected to one end of the primary winding 12a of the ignition transformer 12, and the ground terminal (cathode side power supply terminal) 26c is connected to the other end of the primary winding 12a. The spark plug 13 is connected to the secondary winding 12b.

The thyristor drive circuit 37 turns on the NPN type transistor 37a on the basis of the ignition request signal 33a supplied from the ignition and misfire control circuit 33. Accordingly, the PNP type transistor 37b turns on and the thyristor ( The trigger power is supplied to the gate of 36c). Reference numerals 37c and 37d denote resistances between base resistors and base emitters of the transistor 37a, and reference numerals 37e and 37f denote resistances between the base resistors and base emitters of the transistor 37b. Reference numeral 37g denotes a gate resistance, and reference numeral 37h denotes an inter-gate cathode resistance of the thyristor 36c. The control DC power supply VC is supplied to the gate of the thyristor 36c through the gate resistance 37g when the transistor 37b is turned on. do.

The waveform shaping circuit 34 is composed of an amplifier 34a for amplifying the detection output 6a of the crank angle sensor 6, and a Schmitt trigger circuit 34b for converting the amplification output to a binary signal level. When the crank angle sensor 6 is configured using electromagnetic coupling, the detection output 6a is amplified by the output voltage being changed by the rotational speed of the engine 7, so that the detection output 6a at low rotational speed is assured. It can be detected.

The stall rotation speed detecting means 35 is a monostable multivibrator MM that is triggered at the rising or falling edge of the waveform shaping output 34c, which is the output of the Schmitt trigger circuit 34b, to generate a pulse of a predetermined time width ( 38, the integral circuit 39 for integrating the output pulse 38a of the monostable multivibrator (MM) 38, the starch output 39a and the reference voltage VTH, and the engine 7 When the rotational speed is almost reaching the stall rotational speed, the voltage comparison path 40 generating the stall rotational speed detection output 40a is provided.

The integrating circuit 39 is composed of a time constant circuit composed of a charging resistor 39b and a capacitor 39c. Reference numeral 39d denotes a resistor for setting the discharge time constant, and each diode 39e and 39f is for switching the charge time constant and the discharge time constant.

The voltage comparator 40 divides the control DC power supply VC to divide each of the divided resistors 40b and 40c to generate the reference voltage VTH, and the integrated output voltage 39a supplied to the input terminal I. When the reference voltage VTH supplied to the reference voltage input terminal K is exceeded, the voltage comparator 40d generates the stall rotation speed detection output 40a at the H level.

Alternatively, one of the voltage divider resistors 40b and 40c may be used as a semi-fixed resistor so that the reference voltage VTH can be variably adjusted.

The stall rotation speed detection output 40a may be generated when the idle rotation speed and the stall rotation speed become an arbitrary rotation speed.

In addition, the voltage comparator 40 has a hysteresis characteristic, for example, when the rotation speed slightly lower than the stall rotation speed is generated, the stall rotation speed detection output 40a is generated, and the threshold value is generated. The stall rotation speed detection output 40a may be held until the rotation speed is slightly lower than the rotation speed.

In addition, in the present embodiment, the crest value of the detection output 6a of the crank angle sensor 6 varies according to the engine rotation speed, and as a result, the pulse width of the waveform shaping output 34c also increases as the rotation speed of the engine 7 increases. Since the width fluctuates in a narrowing direction, the pulse width is defined using the monostable multivibrator (MM) 38 to stop. However, the monostable multivibrator MM is used instead of the Schmitt trigger circuit 34b. The arrangement 38 may be arranged in the waveform shaping circuit 34. In addition, a frequency-voltage converter (F-V converter) may be used to replace the monostable multivibrator 38 and the integrating circuit 39 to obtain a voltage output corresponding to the rotational speed.

The ignition and misfire control circuit 33 is composed of an oscillation suppression state detecting means 32 composed of a two-input NAND circuit and an ignition timing signal transmission control means 41 composed of a two-input AND circuit.

One input terminal of the two-input NAND circuit 32 is supplied with the output of the wired end circuit 25 (non-receivable oscillation state detection output) 25a, and the other input terminal has a stall rotation speed detection output 40a. When the input is at the H level (when the shift position is other than neutral and the stall rotation speed is reached while the side stand is not stored, that is, the auto centrifugal clutch 8 is connected, State immediately before oscillation), so that the output of the two-input NAND circuit 32 changes to the L level to prevent the transfer of the waveform shaping output (waveformed ignition timing signal) 34c by the two-input end circuit 41. Consists of.

With this configuration, the oscillation suppression device 21 is wired logic (line logic) supplied to the state input terminal 26d when the side stand is in a stored state or the transmission 3 is set to a neutral position. Since the detection output 25a of the non-receivable oscillation possible state detection means 25 is L level, the output of the oscillation suppression state detection means (two-input NAND circuit) 32 is H regardless of the rotational speed of the engine. The signal 34c, which is maintained at the level and waveform-formed the ignition timing signal 6a supplied to the ignition timing input terminal 26c, is supplied to the thyristor drive circuit through the ignition timing signal transmission control means (two input and end circuits) 41. Supplied to (37) to conduct the thyristor (36c) in the charge-discharge circuit (36), and the energy accumulated in the large-capacity capacitor (36b) is dust-shielded through the primary winding (12a) of the ignition transformer (12) to the secondary The high voltage is generated in the winding 12b to close the spark plug 13. Ignite

When the shift position is other than neutral while the side stand is in the non-receiving state, the detection output 25a of the non-receivable oscillation possible state detecting means 25 becomes H level. In this state, when the rotation speed of the engine 7 reaches the rotation speed set lower than the stall rotation speed above the stall rotation speed or the idle rotation speed and the stall rotation speed detection output 40a of H level is generated, the oscillation suppression state is detected. The means (two-input NAND circuit) 32 outputs the L-level oscillation suppression request signal 32a, and prohibits the transmission of the ignition timing signal 34c from the ignition timing signal transmission means (two-input-and-circuit) 41. Since misfire control is performed, the ignition operation of the engine 7 is reduced, so that the increase in the rotational speed of the engine 7 is limited.

Therefore, oscillation of the two-wheeled vehicle in the state which does not accommodate a side stand is suppressed.

3 is a circuit diagram showing another specific example of the oscillation suppression apparatus by misfire control.

The oscillation suppression device 51 is configured to suppress oscillation by performing misfire control when the period of the detection output 6a (ignition timing signal) of the crank angle sensor 6 is earlier than the set period. The configurations of the ignition and misfire control circuit 52 and the ignition control circuit 55 in the 56 are different from those shown in FIG.

The ignition and misfire control circuit 52 is composed of a monostable vibrator 53 and a two input end circuit 54.

The monostable vibrator 53 enters the operating state when the operation permission input terminal (ENA) 53a is at L level, is triggered at the falling edge of the signal supplied to the trigger input terminal (T) 53b, and the time constant is set. To generate the L-level pulse output to the inverted output terminal (NQ) 53e at a time length set by the time constants of the resistors RS and capacitors CS connected to the terminals R, C, 53c, and 53d. Consists of.

Then, by supplying the detection output 25a of the non-receivable oscillation possible state detecting means 25 supplied to the state input terminal 26d to the operation permission input terminal 53a, it becomes monostable only when it is in the non-receivable oscillation enabled state. By operating the vibrator 53 and supplying the waveform shaping output 34c to the trigger input terminal 53b, the monostable vibrator 53 of the monostable vibrator 53 until a predetermined time elapses from the falling point of the waveform shaping output 34c. The misfire control is prevented by preventing the transfer of the ignition timing signal 34c of the two-input end circuit 54 constituting the ignition timing signal transmission means by the L-level pulse signal 53f output from the power generation output terminal 53e. I did it.

In this embodiment, the load driving capability of the two-input end circuit 54 is large, and the thyristor 36c is directly connected to the output 54a of the two-input end circuit 54 through the gate resistor 37g. The thyristor drive circuit 37 shown in FIG. 2 is omitted as a configuration for triggering.

4 is a time chart for explaining the oscillation suppression operation by the ignition cycle control.

The ignition timing signal 6a, which is the detection output of the crank angle sensor 6 shown in FIG. 4 (a), is waveform-formed by the waveform shaping circuit 34, and the ignition timing signal 34c shown in FIG. 4 (b). )

When the detection output 25a of the non-receivable oscillation possible state detection means 25 is at the L level, the monostable vibrator 53 moves to the fourth (c) diagram in synchronization with the falling of the waveform-shaped ignition timing signal 34c. An output pulse signal 53f having a predetermined L level time length shown is generated, and during this pulse signal period, the output of the two-input end circuit 54 is kept at the L level to prevent the transmission of the ignition timing signal 34c. . Here, the pulse width (L level time) TINH of the output pulse signal 53f is set slightly longer than the period TST of the waveform shaping output 34 at the stall rotation speed shown in FIG. 4 (d). .

Therefore, when the rotational speed of the engine 7 rises from the idle rotational speed to approach the stall rotational speed, and the period of the ignition timing signal 34c is shortened, as shown in FIG. 4E, the ignition timing signal The transfer of the next ignition timing signal 34c that arrives within the ignition prohibition time TINH at the point of descent of 34c is blocked (fire control). Therefore, the increase in the rotational speed of the engine 7 is limited, and oscillation in the side stand non-storage state is suppressed.

In addition, although FIG. 4 (d) shows a time chart when the monostable vibrator 53 is configured to ignore the new trigger signal even while the output pulse signal 53f is generated, it can be retriggered. (Retriggerable) When the period of the ignition timing signal 34c is within the ignition prohibition time TINH using the single-stable vibrator 53, all of the configurations may be controlled to fire.

2 and 3 illustrate a configuration example of the discrete circuit, but in the case of using an ignition unit equipped with a microcomputer, the engine is monitored by monitoring a cycle of the ignition timing signal and adding a program to perform misfire control. The rotation speed suppressing means can be configured.

5 is a block diagram of the oscillation suppression apparatus for limiting the opening degree of the throttle valve.

This oscillation suppression device 61 drives the actuator 64 in which the actuator drive means 63 is constituted by a motor or the like based on the divided voltage output voltage 62a of the variable resistor 62 rotated by the Excel operation of the motorcycle. An engine rotation speed suppressing means 66 for controlling the rotational speed of the engine 7 by controlling the amount and varying the opening degree of the throttle valve 65 linked to the actuator 64 is provided.

When the detection output 5a is supplied from the non-receiving oscillation possible state detecting means 5, the actuator driving means 63 is set to the limit opening degree setting means 65 when the stand is not received, for example, corresponding to the idol rotation speed. The voltage 65a which designates the opening degree of the throttle balance to be selected is selected, and the throttle valve 71 is configured to maintain the opening degree during idle rotation, for example.

Reference numeral 67 denotes a normal ignition unit that does not have a misfire control function.

In addition, the limit opening degree setting means 65 at the time of non-storage of the stand supplies a voltage 65a corresponding to a rotation speed slightly lower than the stall rotation speed, and the actuator driving means (when the detection output 5a is being supplied). 63 may be configured to limit the variable range of the engine rotational speed by the Excel operation with the upper limit of the voltage 65a supplied from the limit opening degree setting means 65 when the stand is not stored.

Because of the above configuration, when the transmission 3 is set to a position other than the neutral state while the side stand is not stored, the opening degree of the throttle valve 71 is limited, so that oscillation is suppressed.

In addition, the configuration of limiting the opening degree of the pottle valve 71 has the advantage that there is no unnecessary fuel injection.

6 is a block diagram of the oscillation suppression apparatus for limiting the intake air amount of the engine.

This oscillation suppression device 81 provides an air quantity limiting valve 83 in the intake pipe 82 of the engine 7, and restricts the engine rotational speed by limiting the amount of air supplied to the engine 7. Means (85).

The air quantity limiting valve 83 is a valve of a fully open structure, and the valve opening degree is throttled while the valve driving signal 84a is supplied from the air quantity limiting valve driving means 84, thereby regulating the amount of supply air to the engine 7. It is configured to limit the range required for idol rotation or the range not exceeding stall rotation speed.

The air volume limiting valve driving means 84 is configured to supply the valve driving signal 84a when the detection output 5a is supplied from the non-storage oscillation possible state detecting means 5.

With the above configuration, when the transmission 3 is out of the neutral position when the side stand is not stored, the air quantity limiting valve 83 is driven to limit the amount of air supplied to the engine 7, so that the rotation speed of the engine 7 The rise is limited and the start of the two-wheeled vehicle is suppressed.

As described above, the oscillation suppression apparatus of the motorcycle according to the present invention has a rotation speed of the engine at a speed at which the automatic centrifugal clutch is not connected when the transmission is in a position other than neutral without the side stand being stored. Since the engine rotation speed suppressing means for suppressing is provided, the start of the two-wheeled vehicle is suppressed in the non-storage state of the side stand.

In addition, even if the side stand is not stored, when the transmission is in the neutral position, the engine speed can be confirmed by increasing the rotational speed of the engine by an Excel operation.

In addition, when the engine rotation speed is suppressed by adding a misfire control function to the ignition control circuit and reducing the ignition of the engine, the engine rotation speed suppressing means can be configured by effectively utilizing another circuit in the ignition unit. In order to suppress oscillation, a space for attaching a new circuit or the like becomes unnecessary.

Claims (2)

An automatic two-wheeled vehicle having an automatic centrifugal clutch and a transmission, comprising: side stand position detecting means for detecting that the side stand is in a non-receiving position, shift position detecting means for detecting that the transmission is outside the neutral position, and the side On the basis of the detection outputs of the stand position detecting means and the shift position detecting means, when the side stand is in a non-received state and the transmission is detected to be outside the neutral position, the rotational speed of the engine is less than that of the centrifugal clutch. And an engine rotation speed suppression means for suppressing the engine rotation speed. An apparatus for suppressing oscillation of a two-wheeled vehicle as claimed in claim 1, characterized in that said engine rotation speed suppressing means comprises an ignition control circuit for performing misfire control to reduce ignition of the engine.