Gear change control device, straddle-type vehicle, and gear change control method
AssigneeYamaha Hatsudoki Kabushiki Kaisha
InventorKengo Minami
Life of this patent
Estimating the term…
Abstract
A gear change control device actuates an actuator in response to an input of a gear change command and sets the clutch in an intermediate state between the engaged and disengaged states before a plurality of gears in the transmission are selectively engaged by dog clutches. In the intermediate state, a driving-side friction member and a driven-side friction member of the clutch are pressed against each other at a pressure lower than in the engaged state. The gear change control device actuates the clutch actuator to restore the friction clutch set in the intermediate state to the engaged state after the plurality of gears are selectively engaged.
Claims28
A gear change control device for a vehicle including a drive wheel, a friction clutch including a driving-side friction member and a driven-side friction member which are pressed against each other in an engaged state and released from each other in a disengaged state, and a transmission including a plurality of gears including dog clutches in which the plurality of gears are selectively disengaged and engaged by the dog clutches at a time of gear change to transmit a torque to the drive wheel at a new transmission ratio, the gear change control device comprising:
- a clutch actuator arranged to operate the friction clutch;
- a clutch shift control module programmed to actuate the clutch actuator in response to a gear change command and to shift the friction clutch to an intermediate state between the engaged state and the disengaged state in which the driving-side friction member and the driven-side friction member are pressed against each other, before the plurality of gears are selectively engaged by the dog clutches, at a pressure lower than a pressure in the engaged state but sufficient to transmit a reduced torque, compared to the engaged state, to the drive wheel;
- and
- a clutch restoration control module programmed to actuate the clutch actuator to restore the friction clutch from the intermediate state to the engaged state after the plurality of gears are selectively engaged by the dog clutches;
- wherein
- the intermediate state is a maximum disengaged state of the friction clutch during the time of gear change.
A gear change control method for a vehicle, the vehicle including a drive wheel, a friction clutch including a driving-side friction member and a driven-side friction member which are pressed against each other in an engaged state to transmit a torque to the drive wheel, a clutch actuator arranged to operate the friction clutch, and a transmission including a plurality of gears each including a dog clutch and in which the plurality of gears are selectively disengaged and engaged by the dog clutches at a time of gear change to transmit the torque to the drive wheel at a new transmission ratio, the gear change control method comprising:
- a step of actuating the clutch actuator in response to a gear change command to set the friction clutch in an intermediate state in which the driving-side friction member and the driven-side friction member are pressed against each other at a pressure lower than a pressure in the engaged state before the plurality of gears are selectively engaged by the dog clutches but sufficient to transmit a reduced torque, compared to the engaged state, to the drive wheel;
- and
- a step of actuating the clutch actuator to restore the friction clutch from the intermediate state to the engaged state after the plurality of gears are selectively engaged by the dog clutches;
- wherein
- the intermediate state is a maximum disengaged state of the friction clutch during the time of gear change.
A gear change control device for a vehicle including a drive wheel, the gear change control device comprising:
- a plurality of sensors;
- an electronic control unit programmed to receive inputs from the plurality of sensors;
- and
- a clutch actuator arranged to receive control signals from the electronic control unit and to operate a friction clutch, the friction clutch including a driving-side friction member and a driven-side friction member which are pressed together in an engaged state to transmit a torque to the drive wheel;
- wherein
- the clutch actuator is actuated in response to a gear change command to shift the friction clutch to an intermediate state during a time of gear change in which the driving-side friction member and the driven-side friction member are pressed together at a pressure lower than a pressure in the engaged state but sufficient to transmit a reduced torque, compared to the engaged state, to the drive wheel before a plurality of speed-change gears are selectively engaged to transmit the torque to the drive wheel at a new transmission ratio;
- and
- the intermediate state is a maximum disengaged state of the friction clutch during the time of gear change.
Dependencies are inferred from the claim text.