| 摘要 |
PROBLEM TO BE SOLVED: To avoid erroneous learning at start from temporary stop and at low speed running by preventing learning of an offset voltage for a specified period just before inversion of car speed pulse. SOLUTION: At an offset voltage learning part, a counter 20 wherein pluses of a car speed sensor 3 are inputted and time measurement is started at pulse inversion is provided. In addition, an offset voltage updating part 21 connected to an A/D converter 11 stores the output data from a yaw rate, to update an offset voltage at a voltage data setting part 13. A switch means 22 is provided between the updating part 21 and the setting part 13. The start of learning is set to, instead of the time when the output data of the yaw sensor is inputted, the time later than that. If a car starts before learning is started, the learning is stopped before that, and if after that, the learning is stopped at that point. Thus, erroneous learning of an offset voltage such as when starting from temporary stop or low speed running is avoided. |
