Identification method of the optimal gear for a transmission of a vehicle

摘要

Identification method of the optimal gear (G TARGET ) for a transmission (6) of a vehicle (1) provided with an engine (4); the identification method includes the steps of: measuring a proceeding speed (V) of the vehicle (1); measuring a current rotation speed (É CURR ) of the engine (4); determining a reference driving power (P REF ); identifying the available gears (G AVA ) which are able to make the engine (4) provide the reference driving power (P REF ) at the proceeding speed (V) of the vehicle (1); calculating for each available gear (G AVA ) the corresponding expected rotation speed (É A ), which would be imposed on the engine (4) according to the proceeding speed (V) of the vehicle (1) and to a transmission ratio of the gear; calculating for each available gear (G AVA ) the corresponding expected torque (T A ), which would be required to the engine (4) according to the reference driving power (P REF ) and to the expected rotation speed (É A ); determining for each available gear (G AVA ) the corresponding expected efficiency (E A ) from the engine (4) according to the expected rotation speed (É A ) and to the expected torque (T A ); and identifying the optimal gear (G TARGET ) among the available gears (G AVA ) according to the corresponding expected efficiencies (E A ).