| 摘要 |
To provide a middle point potential adjusting method for a power steering system capable of precisely equalizing a middle point potential output from a steering force detecting torque sensor to a value of a middle point potential recognized by a power steering controller. A steering force detecting torque sensor 1 is connected to a power steering controller 28 by assembling the steering force detecting torque sensor 1 in a steering force transmission path of an automobile, and a middle point potential adjusting circuit 13 is adjusted so that a torque detection signal Ts which is output from the middle point potential adjusting circuit 13 in a condition where an external force exerted to a steering handle 18 is removed is a potential C to be recognized as a middle point potential by the power steering controller 28. Since the middle point potential adjusting method is configured to adjust the middle point potential in a condition where assembly of the steering force detecting torque sensor 1 and connection of this sensor to the power steering controller 28 are completed, the adjusting method allows external disturbances such as a deviation of the middle point potential caused by an action of an external force and a voltage drop produced in an electric connection path to be absorbed securely, there by enabling to precisely adjusting a middle point potential of the steering force detecting torque sensor 1 under almost the same condition as such a state in which the automobile is actually driven.
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