METHOD FOR SELECTING A GEAR

摘要

A method is provided for balancing clutch wear in a dual clutch transmission, the transmission comprising a first transmission mechanism arranged to transmit mechanical driving force from an output shaft of the internal combustion engine to a first input shaft and to put any one of a first set of gears in an engaged state to connect the first input shaft to the ground engaging members; a second transmission mechanism arranged to transmit mechanical driving force from the output shaft of the internal combustion engine to a second input shaft and to put any one of a second set of gears in an engaged state to connect the second input shaft to the ground engaging members; a controllable first clutch unit arranged to bring the output shaft of the internal combustion engine and the first input shaft into engagement with each other; a controllable second clutch unit arranged to bring the output shaft of the internal combustion engine and the second input shaft into engagement with each other, and an electronic control unit arranged to control gear selection and clutch unit actuation. The method involves performing the steps of determining which clutch unit is subjected to the most accumulated wear and selecting a gear actuated by the other clutch unit during launch of the vehicle.

主权项

1. Method for balancing clutch wear in a dual clutch transmission (13), the transmission comprising a first transmission mechanism (23) arranged to transmit mechanical driving force from an output shaft (20) of a prime mover (12) to a first input shaft (25) and to put any one of a first set of gears in an engaged state to connect the first input shaft to ground engaging members (16); a second transmission mechanism (24) arranged to transmit mechanical driving force from the output shaft (20) of the prime mover (12) to a second input shaft (26) and to put any one of a second set of gears in an engaged state to connect the second input shaft to the ground engaging members (16); a controllable first clutch unit (21) arranged to bring the output shaft of the prime mover and the first input shaft into engagement with each other; a controllable second clutch unit (22) arranged to bring the output shaft of the prime mover and the second input shaft into engagement with each other, and an electronic control unit (15) arranged to control gear selection and actuation of the first and second clutch unit (21, 22), and where the method is characterized by the control unit performing the steps of:
determining which of the first and second clutch unit is subjected to the most accumulated wear; and selecting a gear for launch actuated by the other clutch unit than the above determined clutch unit (22; 21), which gear is higher than the lowest gear in the transmission.