Engine to motor drive mode switching with clutch engagement when engine speed exceeds motor speed

摘要

A hybrid vehicle drive system including (a) an engine (14), (b) an electric motor (16), (c) a planetary gear device having a first rotary element (18s) connected to the engine, a second rotary element (18c) connected to the electric motor and connected through a first clutch (C1) to an output member (22) connected to vehicle drive wheel (52), and a third rotary element (18r) connected through a second clutch (C2) to the output member, (d) a forward-motor-drive control device (104) for engaging the first clutch and releasing the second clutch to thereby establish a forward motor drive mode in which the vehicle is driven in a forward direction by the electric motor, (e) a forward-engine-drive control device (112) for engaging at least the second clutch to establish an engine-drive mode in which the vehicle is driven in the forward direction by the engine, and (f) a second-clutch control device (60, S1-3, S1-6) operable upon switching of a vehicle drive mode from the forward motor drive mode to the forward engine drive mode, for engaging the second clutch (C2) only after the engine speed has exceeded the motor speed.