JP3888535B2 - Sudden start prevention device for saddle riding type vehicle - Google Patents

Description

[0001]
[Technical field to which the invention belongs]
In the present invention, when the vehicle is made to stand on the running surface and the vehicle is immediately started from the state where the rear wheel is driven idle by the driving device, what is the rotational speed of the rear wheel accompanying the driving of the driving device? The present invention relates to a sudden start prevention device for a saddle riding type vehicle that prevents the vehicle from unintentionally suddenly starting without the rider knowing audibly.
[0002]
[Prior art]
A motorcycle that is a straddle-type vehicle is generally configured as follows.
[0003]
In other words, the motorcycle has a front surface, a rear wheel, and a rotating end in a state of being pivotally supported and pivoted downward so as to be pivotable up and down with respect to the vehicle body. A main stand that can be grounded on, an accelerator operation unit that allows an operation force from the outside to be input and an increase or decrease in the drive force that is output from the drive device to the rear wheel according to the operation amount; and A driving device that is supported by a vehicle body so that the rear wheel can be driven to travel, and a control device that controls the driving device; and a rotating end portion of the main stand in a state of being rotated downward; The vehicle body can stand on the traveling surface by the ground contact with the front wheels, that is, the vehicle can stand on its own.
[0004]
When the vehicle is parked, generally, the main stand is pivoted downward to ground the pivot end and the front wheel, while the rear wheel is moved away from the running surface to Be independent on the running surface.
[0005]
Further, when the vehicle is to be started immediately and run from the state where the vehicle body is self-supporting, for example, the following starting operation is frequently used.
[0006]
That is, as described above, the rider rides on the vehicle body in a state where the vehicle body is self-supporting on the traveling surface, and the driving force of the drive device is applied to the rear wheel by the operation on the accelerator operation unit. Thereafter, the wheels are driven to idle. From this state, the rider pushes the vehicle body slightly forward to automatically rotate the main stand upward, thereby releasing the grounding of the main stand and grounding the rear wheels. Then, the vehicle is immediately started from its self-sustaining state by driving the wheels thereafter.
[0007]
Thereafter, when the rider operates the accelerator operation unit to increase or decrease the operation amount, a driving force having a value corresponding to the operation amount is output from the driving device to the rear wheel, so that the vehicle has a desired value. The vehicle can be driven on the traveling surface in a desired driving state such as a vehicle speed.
[0008]
[Problems to be solved by the invention]
By the way, at the time of starting the motorcycle, especially when the main body of the driving device is an electric motor, since the driving sound of the electric motor is small, the rotational speed of the wheels after receiving the driving force from the electric motor is It is difficult to audibly know how much it is.
[0009]
For this reason, when the driving device outputs a large driving force to the rear wheel and the rotational speed in the idle driving of the rear wheel is high, the rider tries to start the vehicle without knowing this. If the grounding of the main stand is released and the rear wheels are grounded, there is a risk that the vehicle will unintentionally start suddenly due to the idle driving of the rear wheels at a high speed. On the other hand, an excessive impact force may be applied unnecessarily, which is not preferable for the life of the drive device.
[0010]
A conventional vehicle having the above configuration is disclosed in Japanese Patent Application Laid-Open No. 11-205902.
[0011]
According to the above publication, a sensor for detecting an upward rotation state (storage state) of the main stand is provided, and in a self-supporting state of the vehicle body in which the main stand is rotated downward, a detection signal of the sensor Some of the above-mentioned drive devices are stopped so that the rear wheels cannot be driven freely. According to this, it is possible to prevent the vehicle from unintentionally suddenly starting from its self-supporting state. Is done.
[0012]
However, the above-described conventional technique has a disadvantage in that the above-described start operation itself, which is generally used to start the vehicle immediately from its self-sustaining state, cannot be performed.
[0013]
The present invention has been made by paying attention to the above-described circumstances, and grounds the front wheel and the main stand included in the vehicle, while allowing the vehicle to stand on the traveling surface by moving the rear wheel away from the traveling surface. When the starting operation is performed to start the vehicle by causing the rear wheel to idle from the state, and then to immediately start the vehicle by releasing the grounding of the main stand and grounding the rear wheel. Prevents the vehicle from unintentionally starting suddenly without knowing how fast the rear wheel rotates due to the drive of the device. An object is to prevent an excessive impact force from being applied.
[0014]
[Means for Solving the Problems]
In order to solve the above-mentioned problems, a sudden start prevention device for a saddle riding type vehicle according to the present invention is as follows. In addition, the code | symbol attached | subjected to each term in this term does not limit and interpret the technical scope of this invention to the content of the term of the "embodiment of invention" mentioned later.
[0015]
According to the first aspect of the present invention, before being supported by the vehicle body 2, the rear wheels 5 and 10 are pivoted so as to be pivotable up and down with respect to the vehicle body 2. A main stand 20 whose end can be grounded on the traveling surface 11, a driving device 25 that is supported by the vehicle body 2 and that can drive the rear wheel 10, and a control device 35 that controls the driving device 25. The vehicle body 2 can stand on the running surface 11 by the ground contact between the rotating end of the main stand 20 and the front wheel 5 in the state of being rotated downward. In riding type vehicles,
[0016]
The rotational speed VF of the front wheel 5 is equal to or lower than a first predetermined value V1 (VF <V1), and the rotational speed VR of the rear wheel 10 is greater than or equal to a second predetermined value V2 greater than the first predetermined value V1. If so (VR ≧ V2> V1), the rotational speed VR of the wheel 10 is then decelerated by the control device 35.
[0017]
According to the second aspect of the present invention, before being supported by the vehicle body 2, the rear wheels 5 and 10 are pivoted so as to be pivotable up and down with respect to the vehicle body 2 and rotated downward. A main stand 20 whose end can be grounded on the traveling surface 11, a driving device 25 that is supported by the vehicle body 2 and that can drive the rear wheel 10, and a control device 35 that controls the driving device 25. The vehicle body 2 can stand on the running surface 11 by the ground contact between the rotating end of the main stand 20 and the front wheel 5 in the state of being rotated downward. In riding type vehicles,
[0018]
If the main stand 20 is rotated downward and the rotational speed VR of the rear wheel 10 is equal to or higher than a predetermined value V2, the rotational speed VR of the rear wheel 10 is reduced by the control device 35. It is made to let you.
[0019]
According to the invention of claim 3, before being supported by the vehicle body 2, the rear wheels 5 and 10 are pivoted so as to be pivotable up and down with respect to the vehicle body 2, and are rotated in a state of being rotated downward. The main stand 20 whose end can be grounded on the running surface 11 and the driving force output from the driving device 25 to the rear wheel 10 according to the amount of operation input from the outside are increased or decreased. An accelerator operating unit 30 that is enabled, a drive device 25 that is supported by the vehicle body 2 and that allows the rear wheel 10 to be driven to travel, and a control device 35 that controls the drive device 25 are provided and rotated downward. In a straddle-type vehicle in which the vehicle body 2 can stand on the running surface 11 by the ground contact between the rotating end of the main stand 20 and the front wheel 5 in a state where
[0020]
When the main stand 20 is rotated downward and the operated amount of the accelerator operating unit 30 is equal to or greater than a predetermined value, the rotational speed VR of the rear wheel 10 is reduced by the control device 35. It is a thing.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0022]
1 and 2, reference numeral 1 denotes a straddle-type vehicle, specifically, an electric motorcycle. An arrow Fr in the figure indicates the front of the vehicle 1.
[0023]
The vehicle body 2 of the vehicle 1 includes a vehicle body frame 3 that mainly constitutes the vehicle body 2, a front fork 4 that is supported on the front upper end of the vehicle body frame 3 so as to be steerable and has a buffer function, and a lower end of the front fork 4. A front wheel 5 supported on the front part, a handle 6 attached to the upper end of the front fork 4, and a rear lower end of the body frame 3 are pivotally supported by a pivot shaft 7 so as to be swingable up and down. A rear arm 8, a shock absorber 9 installed on the vehicle body frame 3 and the rear arm 8, and a rear wheel 10 supported on the swinging end of the rear arm 8 are provided. The vehicle body 2 can be supported on the running surface 11 by the front and rear wheels 5 and 10 (solid line in FIG. 1).
[0024]
Further, the vehicle body 2 is supported by a rear upper end portion of the vehicle body frame 3 and can be seated so that a rider 14 can straddle, and is supported by a lower end portion of the vehicle body frame 3 below the seat 15. And a pair of left and right footrests 16 that allow the rider's feet seated on the seat 15 to be placed thereon. The seat 15 is pivotally supported by a pivot shaft 17 at the rear upper end of the vehicle body frame 3 so that the rear side of the seat 15 can be reciprocally turned upward.
[0025]
The vehicle body 2 includes a main stand 20 disposed below the rear arm 8 of the vehicle body 2. The front end of the main stand 20 is pivotally supported on the rear arm 8 by a pivot shaft 21 so that the rear side of the main stand 20 is rotatable up and down. Further, the main stand 20 is turned in a recumbent posture (hereinafter referred to as a “storing state”) as shown in FIG. 1 and is turned down as indicated by a one-dot chain line in FIG. There is provided a spring 22 that selectively and elastically holds in one of the standing postures (hereinafter referred to as “use state”).
[0026]
When the main stand 20 is in the “retracted state”, the front and rear wheels 5 and 10 are both grounded to the traveling surface 11 to be in a normal travelable state. On the other hand, when the main stand 20 is in the “use state”, the rotating end portion of the main stand 20 and the front wheel 5 are in contact with the traveling surface 11 as shown by a one-dot chain line in FIG. On the other hand, the rear wheel 10 is separated upward from the traveling surface 11 so that the vehicle body 2 can stand on the traveling surface 11, and thus the vehicle 1 can stand on its own and is parked.
[0027]
The vehicle 1 includes a driving device 25 that is supported by the swinging end portion of the rear arm 8 of the vehicle body 2 and that allows the rear wheel 10 to be driven to travel. The drive device 25 includes an electric motor 26 that can output a driving force so as to drive the rear wheel 10 and a planetary gear speed reducer 27 that interlocks and connects the rear wheel 10 to the electric motor 26. The rear wheel 10, the electric motor 26, and the speed reducer 27 are disposed on the same axis 28.
[0028]
The vehicle 1 receives an operating force from an external rider, and an accelerator operating unit 30 that allows the driving force output from the electric motor 26 of the driving device 25 to the rear wheel 10 to be increased or decreased according to the operated amount. It has. The accelerator operation unit 30 is composed of a grip portion of the handle 6 held by the rider, and the grip portion is rotated by the rider's operation.
[0029]
The vehicle 1 is a power source of the electric motor 26 that is detachably supported by the vehicle body frame 3 below the seat 15, and a battery 32 that can supply electric power so that the electric motor 26 outputs driving force; A charger 33 that enables the battery 32 to be supplied with electric power from another power source, and a controller 35 that is supplied with electric power from the battery 32 via a main switch 34 to electronically control the electric motor 26 of the driving device 25; And a meter 36 that is attached to the handle 6 and displays the operating state of the vehicle 1.
[0030]
The control device 35 can convert the DC current of the battery 32 into an AC current and supply it to the electric motor 26 by a central processing device 39 that is a microcomputer that inputs power from the battery 32 via the main switch 34. And an inverter 40. In addition, a signal is output from the central processing unit 39 based on a manipulated amount of the accelerator operation unit 30 by an external operation, and the inverter 40 is a signal output from the central processing unit 39. Is provided through a gate drive 41. The power module 42 is a switching unit that can supply the electric motor 26 with electric power from the battery 32 having a value corresponding to the amount of operation of the accelerator operating unit 30 based on a signal output from the central processing unit 39. The electric motor 26 includes an element 45, and the driving force output from the electric motor 26 is increased or decreased in accordance with the increase or decrease of the electric power supplied from the battery 32 to the electric motor 26.
[0031]
The central processing unit 39, the gate drive 41 of the inverter 40, and the switching element 45 of the power module 42 are provided on a common printed circuit board 46, and the circuit board 46 is supported by the rear arm 8.
[0032]
The vehicle 1 includes a front wheel rotational speed sensor 50 which is included in the meter 36 and detects the rotational speed VF of the front wheel 5 and displays the detection signal on a vehicle speedometer, and the rotational speed VR of the rear wheel 10. A rear wheel rotation speed sensor 51 for detection is provided. Each of the rotational speeds VF and VR is a peripheral speed of the outer peripheral surface of each wheel, and this includes an indirect concept that is a basis for calculating the vehicle speed, that is, the rotational speed of the wheel. In particular, the detection position of the rotational speed VR of the rear wheel 10 by the rear wheel rotational speed sensor 51 may be based on the rotational speed of the rotating portion of the electric motor 26 and the speed reducer 27 in addition to the axle of the rear wheel 10.
[0033]
Further, the vehicle 1 includes a seat sensor 52 that detects whether or not the rider 14 is seated on the seat 15, and a footrest sensor that detects whether or not the foot of the rider 14 is placed on the footrest 16. 53, a main stand sensor 54 for detecting whether or not the main stand sensor 54 is in a “use state” (“stored state”), and an accelerator operation unit sensor 55 for detecting an operated amount of the accelerator operation unit 30. And a temperature sensor 56 for detecting the temperature of the power module 42, and each of the sensors 50 to 56 is electrically connected to the central processing unit 39 of the control device 35, and each detection signal is The data is input to the central processing unit 39.
[0034]
FIG. 3 shows a flowchart of the program of the control device 35, and the symbol S indicates each step of the program.
[0035]
In FIG. 3, in S2, when the rotational speed VF of the front wheel 5 based on the detection signal of the front wheel rotational speed sensor 50 is preset in the central processing unit 39 and exceeds a first predetermined value V1 including zero. If judged (VF> V1), the vehicle 1 is in a parking state in which the vehicle body 2 is made to stand on the running surface 11 by the ground contact between the front wheels 5 and the main stand 20 in the “use state”. Instead, it is determined that the vehicle is in a running state, and the drive device 25 is normally controlled by the control device 35 (S3), and the vehicle 1 is controlled to be in a normal driving state.
[0036]
On the other hand, if it is determined in S2 that the rotational speed VF of the front wheel 5 is a small value equal to or less than the first predetermined value V1 (VF ≦ V1), S4 is executed. In S4, the rotational speed VR of the rear wheel 10 based on the detection signal of the rear wheel rotational speed sensor 51 is a value larger than the first predetermined value V1, and is preset in the central processing unit 39. If it is determined that the value is less than the predetermined value V2 (VR <V2> V1), S3 is executed, and the drive device 25 is normally controlled by the control device 35.
[0037]
If it is determined in S4 that the rotational speed VR of the rear wheel 10 is equal to or higher than the second predetermined value V2 (VR ≧ V2> V1), this is considered from the determination that VF ≦ V1 in S2. For example, the rotational speed VF of the front wheel 5 is a small value, whereas the rotational speed VR of the rear wheel 10 is a considerably large value. It is judged by the control device 35 that the vehicle is parked on the running surface 11 by the main stand 20. In order to start the vehicle 1 from this state, it is determined that the rotational speed VR of the rear wheel 10 is excessively high, and then S5 is executed.
[0038]
If it is determined in S5 that the main stand 20 is not in the state of being rotated downward by the detection signal of the main stand sensor 54, that is, is not in the “use state”, the vehicle body 2 of the vehicle 1 is The front and rear wheels 5 and 10 are supported on the traveling surface 11 and are determined to be in a traveling state, and the above-described S3 is executed, and the driving device 25 is normally controlled by the control device 35.
[0039]
In S5, if it is determined that the main stand 20 is rotated downward, that is, in the “use state”, the vehicle body 2 is in a self-supporting state and the vehicle 1 is in a parked state. It is determined that there is more certain, and S6 is executed.
[0040]
In S6, the operated amount of the accelerator operating unit 30 is less than a predetermined value based on the detection signal of the accelerator operating unit sensor 55, and the electric power from the battery 32 to the electric motor 26 of the driving device 25 according to the operated amount is determined. If it is determined that the supply amount is small, that is, if it is determined that the rotational speed VR of the rear wheel 10 is not an excessively high speed, the above S3 is executed, and the drive device 25 is normally controlled by the control device 35. The
[0041]
In S6, if it is determined from the detection signal of the accelerator operation unit sensor 55 that the operated amount of the accelerator operation unit 30 is equal to or greater than the predetermined value, S7 is executed and the rotational speed VR of the rear wheel 10 is determined. It is decelerated under the control of the control device 35. More specifically, the amount of power supplied from the battery 32 to the electric motor 26 is reduced by the control of the power module 42 of the inverter 40 of the control device 35 based on the detection signal of the accelerator operation unit sensor 55. The rear wheel 10 driven by the electric motor 26 is decelerated.
[0042]
For this reason, the vehicle body 2 is made to stand on the traveling surface 11 by the ground contact between the front wheel 5 of the vehicle 1 and the rotating end portion of the main stand 20 in the “use state” that is rotated downward. When the vehicle 1 is about to start immediately by releasing the grounding of the main stand 20 and grounding the rear wheel 10 during idle driving, the vehicle 1 is immediately started. In S6, since the rotational speed VR of the rear wheel 10 is decelerated and an excessively high speed is avoided, what is the rotational speed VR of the rear wheel 10 that accompanies the driving of the driving device 25? Thus, the vehicle 1 is prevented from suddenly starting without knowing the rider 14.
[0043]
Therefore, in the starting operation of the vehicle 1 described above, it is possible to prevent an unnecessary excessive impact force from being applied to the drive device 25, particularly the speed reducer 27, by the impact force. It is preferable for the life of the machine 27.
[0044]
In the above case, the front wheel rotational speed sensor 50 provided in advance in the meter 36 for detecting and displaying the vehicle speed of the vehicle 1 is used for detecting the rotational speed VF of the front wheel 5. Therefore, the prevention of sudden start of the vehicle 1 can be achieved by a simple configuration for this use.
[0045]
In addition, although the above is based on the example of illustration, the vehicle 1 may be a tricycle. The driving device 25 may be an internal combustion engine. In this case, the electric motor 26 corresponds to the internal combustion engine main body and a throttle valve provided in the intake system of the internal combustion engine main body, and the accelerator operating unit 30 opens the throttle. It corresponds to the degree operation unit.
[0046]
3 may be the first combination of S1, S2, S3, S4, and S7, and the second combination of S1, S3, S4, S5, and S7. It may be a combination, or it may be a third combination of S1, S3, S5, S6, and S7. These steps may be arbitrarily combined, or the first to third combinations may be combined in parallel. It may be provided. In this case, the second predetermined value V2 in the first combination may be different from the second predetermined value V2 in the second combination.
[0047]
【The invention's effect】
The effects of the present invention are as follows.
[0048]
According to the first aspect of the present invention, the front and rear wheels are supported on the vehicle body, and the rotation end in the state of being pivotally supported and pivoted downward with respect to the vehicle body is a running surface. A main stand that can be grounded on top, a drive device that is supported by the vehicle body and that can drive the rear wheels, and a control device that controls the drive device, and is rotated downward In the saddle riding type vehicle in which the vehicle body can be self-supported on the running surface by the grounding of the rotating end of the main stand and the front wheel at
[0049]
If the rotational speed of the front wheel is less than or equal to a first predetermined value and the rotational speed of the rear wheel is greater than or equal to a second predetermined value that is greater than the first predetermined value, the rotational speed of the rear wheel is The speed is decelerated by the control device.
[0050]
Here, as described above, when the rotational speed of the front wheel is equal to or lower than the first predetermined value and the rotational speed of the rear wheel is equal to or higher than the second predetermined value that is larger than the first predetermined value. The rotation speed of the front wheel is a small value, whereas the rotation speed of the rear wheel is a considerably large value. Therefore, the vehicle body is made to stand on the running surface by the front wheel and the main stand. Judged to be in an independent state.
[0051]
Therefore, as described above, the rotational speed of the rear wheel is decelerated. For this reason, from the self-standing state of the vehicle body, the grounding of the main stand is released to ground the rear wheel during idle driving. Thus, when the vehicle is about to start immediately, the rotational speed of the rear wheels is decelerated and overspeed is avoided as described above. It is possible to prevent the vehicle from unintentionally suddenly starting without the rider knowing what the rotational speed of the rear wheel accompanying the drive is.
[0052]
Therefore, in the vehicle starting operation described above, it is prevented that an excessively large impact force is unnecessarily applied to the drive device by the impact force, which is preferable in terms of the life of the speed reducer of the drive device.
[0053]
Further, according to the above invention, the sensor is not necessary for determining that the vehicle body is in a self-supporting state, and accordingly, the prevention of the sudden start of the vehicle can be achieved with a simple configuration.
[0054]
The invention according to claim 2 is that the front and rear wheels are supported on the vehicle body, and the rotation end in the state of being pivotally supported and rotated downward with respect to the vehicle body is a running surface. A main stand that can be grounded above, a drive device that is supported by the vehicle body and that allows the rear wheels to travel and drive, and a control device that controls the drive device, and is rotated downward In the saddle riding type vehicle in which the vehicle body can be self-supported on the running surface by the grounding of the rotating end of the main stand and the front wheel at
[0055]
If the main stand is rotated downward and the rotational speed of the rear wheel is equal to or higher than a predetermined value, the rotational speed of the rear wheel is reduced by the control device.
[0056]
Here, as described above, when the main stand is rotated downward, the vehicle body is in a self-supporting state in which it is made self-supporting on the traveling surface by the front wheels and the main stand. Is more accurately determined.
[0057]
Therefore, as described above, the rotational speed of the rear wheel is decelerated. For this reason, from the self-standing state of the vehicle body, the grounding of the main stand is released to ground the rear wheel during idle driving. Thus, when the vehicle is about to start immediately, the rotational speed of the rear wheels is decelerated and overspeed is avoided as described above. It is possible to prevent the vehicle from unintentionally suddenly starting without the rider knowing what the rotational speed of the rear wheel accompanying the drive is.
[0058]
Therefore, in the vehicle starting operation described above, it is prevented that an excessively large impact force is unnecessarily applied to the drive device by the impact force, which is preferable in terms of the life of the speed reducer of the drive device.
[0059]
According to a third aspect of the present invention, the front and rear wheels are supported on the vehicle body, and the rotation end in the state of being pivotally supported and pivoted downward with respect to the vehicle body is a running surface. A main stand that can be grounded on, an accelerator operation unit that inputs an operation force from the outside and can increase or decrease the drive force output from the drive device to the rear wheel according to the operated amount; and A driving device that is supported by a vehicle body so that the rear wheel can be driven to travel, and a control device that controls the driving device; and a rotating end portion of the main stand in a state of being rotated downward; In a straddle-type vehicle in which the vehicle body can stand on the running surface by grounding with a front wheel,
[0060]
When the main stand is rotated downward and the operated amount of the accelerator operation unit is equal to or greater than a predetermined value, the rotational speed of the rear wheel is decelerated by the control device.
[0061]
The effect of this invention is the same as that of the invention of claim 2 but the following effect is also produced.
[0062]
That is, as described above, if the operated amount of the accelerator operating unit is equal to or greater than a predetermined value, the value of the rotational speed of the rear wheel at that time may be excessive in the near future even if it is not excessive. In addition, since the rotation speed of the rear wheel is decelerated including such a case, the unintentional sudden start of the vehicle is more reliably prevented.
[Brief description of the drawings]
FIG. 1 is an overall side view of a vehicle.
FIG. 2 is an electrical wiring diagram in a vehicle.
FIG. 3 is a flowchart of the control device.
[Explanation of symbols]
1 vehicle
2 body
3 Body frame
4 Front fork
5 front wheels
10 Rear wheel
11 Running surface
14 Rider
20 Main stand
21 pivot axis
22 Spring
25 Drive unit
26 Electric motor
30 Accelerator operation part
35 Control device
36 meters
50 Front wheel speed sensor
51 Rear wheel rotation speed sensor
54 Main stand sensor
55 Accelerator operation unit sensor
VF rotation speed
VR rotation speed
V1 first predetermined value
V2 second predetermined value

Claims (3)

Before being supported on the vehicle body, the rear wheel and the rotating end portion in a state of being pivotally supported and rotated downward with respect to the vehicle body can be grounded on the traveling surface. A main stand, a drive device that is supported by the vehicle body and capable of driving the rear wheels, and a control device that controls the drive device. The main stand is rotated in a downward direction. In a straddle-type vehicle in which the vehicle body can be self-supported on a running surface by grounding of the moving end portion and the front wheel,
If the rotational speed of the front wheel is less than or equal to a first predetermined value and the rotational speed of the rear wheel is greater than or equal to a second predetermined value that is greater than the first predetermined value, the rotational speed of the rear wheel is A sudden start prevention device in a saddle-ride type vehicle that is decelerated by a control device. Before being supported on the vehicle body, the rear wheel and the rotating end portion in a state of being pivotally supported and rotated downward with respect to the vehicle body can be grounded on the traveling surface. A main stand, a drive device that is supported by the vehicle body and capable of driving the rear wheels, and a control device that controls the drive device. The main stand is rotated in a downward direction. In a straddle-type vehicle in which the vehicle body can be self-supported on a running surface by grounding of the moving end portion and the front wheel,
If the main stand is rotated downward and the rotational speed of the rear wheel is greater than or equal to a predetermined value, the rotational speed of the rear wheel is decelerated by the control device. A sudden start prevention device for a vehicle. Before being supported on the vehicle body, the rear wheel and the rotating end portion in a state of being pivotally supported and rotated downward with respect to the vehicle body can be grounded on the traveling surface. A main stand, an accelerator operation unit for inputting an operating force from the outside and allowing the driving force output from the driving device to the rear wheel to be increased / decreased according to the operated amount, and a rear supported by the vehicle body Provided with a drive device that enables driving of the wheel and a control device that controls the drive device, and by grounding the rotating end of the main stand and the front wheel in a state of being rotated downward, In the saddle-ride type vehicle that enables the vehicle body to stand on the running surface,
A straddle type in which the main stand is rotated downward and the rotational speed of the rear wheel is decelerated by the control device when the operated amount of the accelerator operating unit is a predetermined value or more. A sudden start prevention device for a vehicle.

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