A METHOD FOR A MORE EFFICIENT USE OF A COMBUSTION ENGINE IN A VEHICLE

摘要

A method for a more efficient use of a vehicle combustion engine during driving, said vehicle comprising an automatic step geared transmission, said method comprising the steps of : - sensing current engine rotational speed and engine rotational speed increase, - estimating necessary minimum upshift engine rotational speed for a coming gear upshift; - registering that the engine rotational speed stops increasing without reaching said minimum upshift engine rotational speed, and where said engine rotational speed stops increasing relatively close to a maximum engine rotational speed where engine efficiency is relatively low and, - automatically controlling engine output torque in order to limit the engine rotational speed to a first predetermined engine speed where engine efficiency is relatively high.