Vehicular hybrid drive system

摘要

A hybrid drive system configured to selectively establish one of a first drive mode in which a first motor/generator MG1 is operated with a drive force of an engine, to generate an electric energy and in which a vehicle drive force is generated primarily by a second motor/generator MG2, and a second drive mode in which the vehicle drive force is generated by the engine, and at least one of the first motor/generator MG1 and second motor/generator MG2 is operated to generate an assisting vehicle drive force, as needed, and further configured such that an amount of a working oil to be supplied to the first motor/generator MG1 is larger in the first drive mode than in the second drive mode, permitting sufficient cooling of the electric motor depending upon a selected one of the vehicle drive modes.

主权项

1. A vehicular hybrid drive system provided with an engine, a first electric motor connected to said engine, and a second electric motor connected to drive wheels of the vehicle, said hybrid drive system comprising drive mode determining means for selectively establishing one of a first drive mode in which said first electric motor is operated with a drive force of said engine, to generate an electric energy and in which a vehicle drive force is generated primarily by said second electric motor, and a second drive mode in which the vehicle drive force is generated by said engine and in which at least one of said first and second electric motors is operated to generate an assisting vehicle drive force, as needed,
said hybrid drive system further comprising supply oil amount control means for controlling an amount of a working oil to be supplied to said first electric motor such that the amount is larger in said first drive mode than in said second drive mode.