| 摘要 |
PROBLEM TO BE SOLVED: To determine a deterioration degree of a radiator without providing a sensor and the like adjacent to the radiator.SOLUTION: A secular change quantity QWt(R) of a radiator is calculated as a sum of a secular change quantity QWt(M) of a cooling loss calorific value of a motor at a time of a prescribed travel and a secular change quantity QWt(P) of a cooling loss calorific value of a PCU at the time of the prescribed travel (steps S100-S160). If the calculated secular change quantity QWt(R) exceeds a threshold Qth, a secular change of the radiator is determined as advanced (steps S170, S180). Thereby, a deterioration degree of the radiator can be determined without providing a sensor such as a temperature sensor adjacent to the radiator.SELECTED DRAWING: Figure 3 |
