Abstract: An automatic control device for a motorcycle including a control device that automatically controls an automatic cruise control system and a brake system including a front wheel brake and a rear wheel brake includes a brake temperature detection unit that detects a brake temperature. The control device varies operation states of the front wheel brake and the rear wheel brake according to the brake temperature during automatic cruise control. At a time of deceleration in a case where the brake temperature during the automatic cruise control is low, the control device raises the brake temperature by reducing an engine brake of a power unit of a vehicle and increasing operation frequencies of the front wheel brake and the rear wheel brake.

Abstract: A vehicle transmission wherein a single shift spindle is provided with a master arm to operate the transmission via an accumulation mechanism and a clutch lever to operate a clutch, capable of more reliably realizing disconnection of the clutch after the completion of accumulation necessary for a shift operation. A vehicle transmission includes a master arm provided on a shift spindle for transmitting a rotational force to a shift drum of a transmission to rotate and operate the shift drum with a clutch lever provided on the shift spindle, to operate the clutch. An accumulation mechanism is capable of accumulating the rotational force transmitted from the shift spindle to the master arm. The master arm and the clutch lever are interlocked with each other. A delay mechanism is provided that delays the clutch disconnection operation with the clutch lever before accumulation is completed between the shift spindle and the clutch.

Abstract: A speed change controlling apparatus in which the mode of driving force transmission is depends upon the roll angle of a vehicle body. When a roll angle is within a range from a second roll angle, which corresponds to a full bank state, to a first roll angle, speed change operation is carried out by soft speed change control in which variation of the driving force with respect to time is smaller than that by normal speed change control. If the roll angle is within another range from the first roll angle to a third roll angle, then normal speed change is carried out and if the roll angle is within a further range from an uprightly standing state to the third roll angle, then speed change operation is executed by direct speed change. When the roll angle is greater than the second roll angle, speed change is inhibited.

Abstract: A vehicle transmission wherein a single shift spindle is provided with a master arm to operate the transmission via an accumulation mechanism and a clutch lever to operate a clutch, capable of more reliably realizing disconnection of the clutch after the completion of accumulation necessary for a shift operation. A vehicle transmission includes a master arm provided on a shift spindle for transmitting a rotational force to a shift drum of a transmission to rotate and operate the shift drum with a clutch lever provided on the shift spindle, to operate the clutch. An accumulation mechanism is capable of accumulating the rotational force transmitted from the shift spindle to the master arm. The master arm and the clutch lever are interlocked with each other. A delay mechanism is provided that delays the clutch disconnection operation with the clutch lever before accumulation is completed between the shift spindle and the clutch.

Abstract: A speed change controlling apparatus in which the mode of driving force transmission is depends upon the roll angle of a vehicle body. When a roll angle is within a range from a second roll angle, which corresponds to a full bank state, to a first roll angle, speed change operation is carried out by soft speed change control in which variation of the driving force with respect to time is smaller than that by normal speed change control. If the roll angle is within another range from the first roll angle to a third roll angle, then normal speed change is carried out and if the roll angle is within a further range from an uprightly standing state to the third roll angle, then speed change operation is executed by direct speed change. When the roll angle is greater than the second roll angle, speed change is inhibited.

Abstract: A clutch control system for a vehicle includes an actuator which is configured to control a hydraulic pressure. A timer is configured to measure a time period from a timing at which a hydraulic pressure supply source starts supplying hydraulic oil to a hydraulic clutch to a timing at which the hydraulic pressure reaches a predetermined value. A clutch control compensator is configured to calculate a control compensation value of an amount of operation of the actuator based on the time period measured by the timer. A clutch controller is configured to control the actuator based on the control compensation value and the amount of operation of the actuator using a deviation between the hydraulic pressure detected by the hydraulic pressure detector and a target hydraulic pressure set according to a condition of the vehicle.

Abstract: A clutch control system for a vehicle includes an actuator which is configured to control a hydraulic pressure. A timer is configured to measure a time period from a timing at which a hydraulic pressure supply source starts supplying hydraulic oil to a hydraulic clutch to a timing at which the hydraulic pressure reaches a predetermined value. A clutch control compensator is configured to calculate a control compensation value of an amount of operation of the actuator based on the time period measured by the timer. A clutch controller is configured to control the actuator based on the control compensation value and the amount of operation of the actuator using a deviation between the hydraulic pressure detected by the hydraulic pressure detector and a target hydraulic pressure set according to a condition of the vehicle.