| 摘要 |
PROBLEM TO BE SOLVED: To suppress the frequent repetition of starting and stopping an internal combustion engine for heating the cabin of a hybrid electric vehicle.SOLUTION: A hybrid electric vehicle air conditioning control unit intermittently actuates an engine with optimum fuel economy so that a coolant temperature of the engine is kept in a predetermined heating temperature range in response to a heating request. Furthermore, the air conditioning control unit switches over between outdoor air circulation and indoor air circulation so that a humidity of a cabin is kept in a predetermined humidity range. The inside air circulation is kept as long as the humidity of the cabin does not exceed the predetermined humidity range, thereby suppressing a temperature reduction of the cabin and increasing the interval between actuation and stop of the engine. Moreover, it is possible to make effective use of energy by using an output of the internal combustion engine generated by actuating the engine with the optimum fuel economy for charging a power storage device. |
