| 摘要 |
PROBLEM TO BE SOLVED: To estimate a relock control initiation time against a heat slack without the necessity of a pressing force sensor even when an environment has changed such as when a wind speed has changed or it has become rainy, and implement relock.SOLUTION: A propeller shaft 18 presses a brake pad 11 on the basis of a motor current value of a motor 10 that drives an EPB 2, and a pressing force applied to a brake disk 12 is detected. Based on a difference between a pressing force F(1) applied when lock control is terminated and a pressing force FC applied when a predetermined time TC has elapsed since then, an appropriate one of plural pressing force decrease maps M is selected. The selected pressing force decrease map M is used to estimate a relock control initiation time T(2). Accordingly, a pressing force sensor is not needed. Even when an environment has changed such as when a wind speed has changed or it has become rainy, the relock control initiation time T(N) against a heat slack can be properly estimated, and relock control can be implemented. Eventually, a stopped vehicle can be sustained properly. |
