| 摘要 |
PURPOSE:To execute an angle detection for scarcely causing a drift error, by executing an integration extending from before a prescribed time of the time point when an angular velocity signal exceeds a decision level, to after a prescribed time of the time point when said signal has entered within the decision level, and executing no integration in other period than said period. CONSTITUTION:A shift register 11 operates as a delay means for delaying by a time (tc) portion an angular velocity signal from an angular velocity sensor 2, which has been inputted through an A/D converter 10. A level setting part 12 sets a voltage level ¦Vc¦, and to a comparator 13, the voltage level ¦Vc¦ and the angular velocity signal are inputted, respectively. An output of the comparator 13 becomes an H level and an L level, when the angular velocity signal exceeds the voltage level ¦Vc¦, and at other time, respectively, connected to a set input S of an FF 14, and also, connected to a reset input R of the FF 14 through an inverter 15 and a delaying circuit 16 of a delay time 2tc. When a Q output of the FF 14 is at an H level, an integrator 17 executes an integration by integrating successively the digitized angular velocity signal which has been delayed by the time (tc), from the shift register 11, and sends out an angle signal to its output. |
