| 摘要 |
<p>PURPOSE:To perform assist control always to a safety side, even when trouble is caused in a torque sensor, and further to prevent misdecision of trouble against noise or the like by controlling a drive current of a motor in accordance with a mean value of an output of each torque sensor. CONSTITUTION:An output T1 of a torque sensor 3a and an output T2 of a torque sensor 3b are input. When the outputs T1, T2 are in a normal range and when an absolute value of a difference between the outputs T1, T2 is DELTAM or less, a mean value of the torque values T1, T2 is obtained to calculate a phase compensating element from this mean value. A car speed is calculated, and a motor assist current is calculated in accordance with the phase compensating element and the car speed to drive a motor 13 by controlling a motor current while detecting it. In the case that trouble is caused in the one torque sensor to displace its output to a high or low side, since the mean value of the outputs of both the torque sensors 3a, 3b is used to perform assist control, an influence of the trouble is halved to ensure safety.</p> |
