| 摘要 |
PURPOSE:To execute the zero point adjustment with high accuracy by weighting successively an angular velocity detection value outputted from an angular velocity sensor while a moving body is stopping, and thereafter, bringing it to an averaging processing, and subtracting its average value as a drift portion from an output of the angular velocity sensor at the time of the subsequent running. CONSTITUTION:In a signal processor 8, when a stop state of an automobile has been detected, a declination signal DELTAtheta sent from an A/D converter 3 is read in, weighted successively, and thereafter, a low-pass filter processing for averaging is executed. In such a way, in the declination signal DELTAtheta in a stop period, an average value is stored as a drift value D of an angular velocity sensor 1. Subsequently, by subtracting its drift value D from the declination signal DELTAtheta sent from the A/D converter at the time of the subsequent running, a drift correction is executed. In such a way, the zero point adjustment of the angular velocity sensor 1 can be executed with high accuracy. |
