DEVICE AND METHOD FOR CHANGING GEARS IN A POWERTRAIN OF A MOTOR VEHICLE

摘要

The invention relates to a method pertaining to changing gear in a power train of a motor vehicle (100; 110) provided with an engine (230), a clutch device (240) and a gearbox (250) without synchronising rings. The method comprises the step of demanding (s310) gear ratio change in said gearbox (250). The method comprises also the steps of interrupting torque transmission (s330) between said engine (230) and said gearbox (250) by means of said clutch device (240), choosing (s340) an engine speed set-point value (n_ref), determining (s360) whether said engine (230) responds to a demand for said engine (230) to be directed towards said speed set-point value (n_ref), and changing gear ratio (s370) if said engine (230) responds to said demand. The invention relates also to a computer programme product comprising programme code (P) for a computer (200; 210) for implementing a method according to the invention. The invention relates also to a device and a motor vehicle (100; 110) equipped with the device.