| 摘要 |
PROBLEM TO BE SOLVED: To increase the accuracy of detection and the detectable range of the longitudinal acceleration sensor of a vehicle. SOLUTION: The time integration of the time derivative value of longitudinal acceleration Gs to be output by a longitudinal acceleration sensor is carried out to calculate corrected longitudinal acceleration Ga. Thus, even when longitudinal acceleration offset quantity Gos as the components in the road surface direction of gravity is present, it is possible to detect the correct corrected longitudinal acceleration Ga. When the longitudinal acceleration offset quantity Gos is less than a prescribed value, and the longitudinal acceleration Gs is less than the detectable critical value (a) of the longitudinal acceleration sensor, the corrected longitudinal acceleration Ga is divided by a brake liquid pressure P to calculate a gradientα. Then, when the longitudinal acceleration Gs is less than the detectable critical value (a), the corrected longitudinal acceleration Ga is defined as an estimated longitudinal acceleration Ga', and when the longitudinal acceleration Ga is equal to or more than the detectable critical value (a), a value calculated by addingα×P to the detectable critical value (a) is defined as the estimated longitudinal acceleration Ga'. Thus, it is possible to accurately calculate the longitudinal acceleration in a region equal to exceeding the detectable critical value (a) of the longitudinal acceleration sensor, and to enlarge the detectable range of the longitudinal acceleration by a single longitudinal acceleration sensor. COPYRIGHT: (C)2010,JPO&INPIT |
