| 摘要 |
PROBLEM TO BE SOLVED: To provide a power steering system of a hybrid vehicle capable of offering an excellent steering feeling by suppressing a variation in a steering assistance property while avoiding a rise in a cost of manufacture and degradation in fuel economy.SOLUTION: When an HEV mode or E/G mode is switched into an EV mode, it is determined whether the EV mode can be sustained over a determination time T through travel mode switching determination processing. The travel modes are switched based on the result of the determination. When a second hydraulic pump is driven in a warm-up mode using a PS motor in the duration of the determination time T, a low-temperature working oil that dwells in the vicinity of the second hydraulic pump in a hydraulic circuit is returned to an oil pan. Instead, the working oil that has undergone warm-up is introduced from the oil pan. |
