| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a torque controlling method for a power-assisted bicycle capable of determining whether zero point abnormality is due to some fault in a torque sensor itself or abnormal measuring operation when the zero point abnormality occurs. <P>SOLUTION: In this torque controlling method for the power-assisted bicycle comprising: a torque sensor 41 for detecting a stepping force from a pedal; a motor 42 for assisting the stepping force; a toque-current calculating means 50 for calculating a motor driving current instruction value based on the detection data of stepping force torque synchronously fluctuating with pedal rotation; and a motor driving circuit 44 for driving the motor based on the current instruction value, the toque-current calculating means measures the zero point of the torque sensor when the motor starts drive control, and subtracts a zero point value from the detection data of the torque sensor so as to calculate the stepping force. A torque sensor abnormality determination means 52 is provided, which sets a threshold for determining the torque sensor abnormality, judges abnormality to stop the motor driving when a state in which the lowest point of the detection data is larger than the threshold continues over a specified time. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
