Method for driver-dependent shift control of a vehicle sub- transmission which maximizes fuel economy

摘要

A method is disclosed for automatically shifting the sub- transmission of a vehicle which is also equipped with a manual transmission operated by hand by the driver. When the driver shifts by hand to a certain gearing ratio, a vehicle operating parameter is detected, and, on the basis of this detected value, the procedure for shifting the sub- transmission is modified. Shift control of the sub- transmission is performed in accordance with this modified sub- transmission shift procedure, for a first time period, while the manual transmission remains in this gearing ratio, and subsequently for a second time period shift control of the sub-transmission is performed so as to maximize fuel economy, while the manual transmission remains in this gearing ratio.