| 摘要 |
PROBLEM TO BE SOLVED: To improve fuel economy by enhancing the efficiency of a power transmission system of a hybrid vehicle.SOLUTION: During the warmup of a transmission 13 (period at which an oil temperature of the transmission 13 is not higher than a prescribed value), a target input rotation speed is set by taking into consideration even the oil temperature of the transmission 13, by taking into consideration ATF warmup performance on the basis of the oil temperature of the transmission 13, an output rotation speed of the transmission 13, and the required torque of a vehicle, and also by taking into consideration T/M efficiency while promoting MG power generation, and thus the ATF warmup and the reduction of fuel economy during the warmup are made compatible by controlling the transmission 13 so as to obtain the target input rotation speed, and by controlling the transmission 13 so that total efficiency becomes maximum. On the other hand, after the warmup of the transmission 13 (period at which the oil temperature of the transmission 13 is higher than the prescribed value), the target input rotation speed is set so that the total efficiency becomes maximum on the basis of an output rotation speed of the transmission 13 and the required torque of the vehicle, and the fuel economy after the warmup is reduced by controlling the transmission 13 so that the total efficiency becomes maximum by controlling the transmission 13 so as to obtain the target input rotation speed. |
