| 摘要 |
<p>PURPOSE:To prevent misjudgment by determining steered quantity from a difference between a steering center value following an actual steered angle with a given time constant applied and the actual steered angle, and making an abnormality judgment for a steering sensor on a judgment basis that a vehicle is in a straight-going state when the steered quantity is a set steering quantity or less. CONSTITUTION:In a steering angle sensor abnormality detection means 9, a vehicle speed judging part 91, for judging whether a vehicle speed detected by a vehicle speed sensor 5 is not less than a set vehicle speed Vth or not, and a steering force judging part 92, for judging whether a steering force by a steering force sensor 1 is not more than a set steering force Tth or not, are provided. Moreover a steered quantity judging part 94, for judging whether the absolute value of steered quantity is not more than set steering quantity or not by receiving the output from a steering center value computing part 93 for determining a steering center value, is provided. When all values are judged YES in each judging part 91, 92, and 94, output is generated from a condition judging part 95, and when the output generation continues for a given time or more, the straight-going state of a vehicle is judged, and an abnormality judgment of a steering sensor 3 is made by an abnormality judging part 98 from output from a steered angle judging part 97.</p> |
