| 摘要 |
PROBLEM TO BE SOLVED: To provide a technology which can make compatible both coping with an increase of a temperature rise rate caused by the deterioration of a PCU, and the suppression of the mixing of air bubbles into a liquid refrigerant (air bite).SOLUTION: In a cooling system 11, a flow rate of a refrigerant is increased as a degree of the deterioration of a PCU becomes large, and on the other hand, when the acceleration of a hybrid vehicle is not smaller than a threshold ThG1 for A-rank acceleration which is preset according to the degree of the deterioration of the PCU (S22; Dp≥A, S26; Yes), a cooling controller decreases the flow rate of the refrigerant (S27). By this constitution, an increase of the flow rate caused by a rise of the degree of the deterioration of the PCU is offset. Accordingly, a liquid level height of a reservoir tank is not lowered, and even if a liquid level of the refrigerant in the reservoir tank is inclined due to the abrupt acceleration and abrupt steering of the hybrid vehicle, the liquid level is hardly lowered to a position which is lower than a discharge port. The intrusion of air from the discharge port is suppressed, and air bite is suppressed.SELECTED DRAWING: Figure 5 |
