VEHICLE TRANSMISSION CONTROL AND ENGINE OPERATING MODES

摘要

A method for controlling a vehicle which is provided with a combustion engine and a controllable or automatic transmission. The vehicle is provided with a control element such as a throttle pedal which can be activated by a driver of said vehicle for regulating the speed of the vehicle. The combustion engine and the transmission are electronically adjusted by means of a control unit on the basis of the speed of the vehicle and the desired output power of the vehicle, which is indicated by means of the control element. The shifting points of the transmission are adjusted on the basis of the most economical operating point of the engine, resulting in lower fuel consumption. The optimal gear ratio is obtained directly from a look-up table (2). The engine may be provided with dual inlet valves having variable lift and/or variable length intake ducts or air supply channels, resulting in different engine operating modes (4). There may be a non-linear relationship (1) between the accelerator pedal position (ap) and the desired tractive force (Fd).