METHOD AND SYSTEM FOR CONTROLLING START-UP OF A MOTOR VEHICLE BY DIALOGUE OF THE ENGINE CONTROLLING COMPUTER WITH THE PILOTED MECHANICAL GEARBOX, DURING A RESTART OF THE VEHICLE IN STOP AND START MODE

摘要

The invention concerns a method and a system for controlling start-up of a motor vehicle by dialogue of the engine controlling computer with the piloted mechanical gearbox, during a restart of the vehicle in stop and start mode. A“start-up authorization”is transmitted to the gearbox at a time t when the following three conditions are fulfilled: a) verifying the position of the accelerator pedal relative to a predetermined“threshold”position; b) the engine is in sequential injection phase; c) verifying a so-called“autonomous condition”, calculated on the basis of the engine speed and of an engine speed gradient compared to a predetermined threshold value. The invention is applicable to motor vehicles.