Patent ID: 6823250
Filing Date: 2004-11-23
Classification: B60K,B60L,B60W,F02D,F16H,Y02T,Y10S

Abstract:
A vehicular power transmission control system for a vehicle, the power transmission control system comprising an engine, an electrical motor generator, a continuously variable transmission that transmits a rotational driving force of said engine and/or said electrical motor generator to wheels with a continuously variable speed change ratio, and inclination-detecting means for detecting an inclination of a road surface where the vehicle is traveling,wherein a target engine rotational speed is set based on an operational condition of the vehicle, and the speed change ratio of the continuously variable transmission is controlled so that a rotational speed of said engine approaches the target engine rotational speed, wherein the target engine rotational speed is corrected based on a difference &Dgr;E between an actual output and a requested output of the electrical motor generator, wherein the target engine rotational speed becomes higher as said difference &Dgr;E becomes larger, wherein, if the vehicle is traveling downhill, the electrical motor generator is driven by a force from the vehicle's wheels, and the speed change ratio is corrected based on the difference &Dgr;E, wherein the requested output is equal to a requested energy recovery output Er that is to be generated by the electrical motor generator when the vehicle is traveling downhill, and wherein the actual output is equal to an actual energy recovery output Ea that is generated by the electrical motor generator, and wherein each of a plurality of correction values is associated, respectively, with a different range of possible values for the difference &Dgr;E, and one of the correction values is selected for correcting the target engine rotational speed based on the range in which the difference &Dgr;E falls and a current vehicle speed V.