Method and apparatus for correcting the zero pressure value of a hydraulic power steering pressure sensor

摘要

A method and apparatus for correcting the zero pressure value of a hydraulic power steering pressure sensor. A power steering pressure PK is detected through pressure sensors 9 and 10 of a power steering cylinder 1 after an engine 14 stops running. The number of detections D [PK] of the power steering pressure PK is added up, provided that the power steering pressure PK remains unchanged for a predetermined time period, and then after a predetermined time period passes after the engine has stopped running, the power steering pressure PK, at which the number of detections D [PK] reaches a maximum value, is adopted as the zero pressure value of the pressure sensors. This makes it possible to accurately correct the zero pressure value of the pressure sensors in the hydraulic power steering unit.