| 摘要 |
In a vehicle with rack (3) and pinion (5) steering gear, the driver applies torque to the steering column (6) via the wheel (2). The power assistance system (S1) applies a supplementary torque, e.g. to the column, from an actuator (10) controlled by a calculating unit (11), with sensor inputs representing the driver's applied torque (13), steering wheel angle (14) and vehicle speed (15). To counteract disturbances from external causes like cross-wind gusts, surface irregularities, etc., a transient correction system (S2) is installed, whose calculating unit (21) also has steering wheel angle and vehicle speed inputs, with additional data from another sensor (22), measuring the vehicle's rate of yaw. Teh unit's actuator (20) makes corrections by displacing the steering rack casing (4). Transient correction involves thee calculation of an appropriate reference value for the yaw rate from the other two input parameters, using e.g. type-test results. The differential error value, through a tabulated relation, determines the actuator movement. To maintain the driver's comfort and confidence in his control, the reactive effect of transient corrections is annulled at the steering wheel using a third calculating unit (S3). This derives (30) from the second unit output a compensating torquee value, and injects it into the main controller (S1).
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