CONTROLLER FOR POWER TRANSMISSION DEVICE FOR VEHICLE

摘要

PROBLEM TO BE SOLVED: To provide a controller for preventing the deterioration of fuel consumption by improving transmitting efficiency of power in a power transmission device for vehicle with a differential mechanism whose differential action is operable and a motor.

SOLUTION: A continuously variable transmission part control means 80 sets a transmission gear ratio γCVTof a continuously variable transmission part 20 so that an engine operation point PEGcan follow a combustion efficiency optimum line LEF, so that an engine 8 is operated by the optimum fuel consumption, and to suppress the deterioration of fuel consumption. Also, a power transmission path between a differential section 11 and a driving wheel 38 is configured by the continuously variable transmission part 20 which is able to continuously change the transmission gear ratio γCVT, so that an engine rotating speed NEcan be prevented from being constrained by a vehicle speed V by changing the transmission gear ratio γCVTof the continuously variable transmission part 20 without adjusting a first motor rotating speed NM1. Thus, the engine 8 is operated so that the engine operating point PEGcan follow the combustion efficiency optimum line LEFwhile maintaining the differential section 11 to a differential state that transmission efficiency η11is sufficiently high.

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