Method for determining the absolute angular position of the steering wheel of a motor vehicle

摘要

The invention relates to a method for determining the absolute angular position of a steering wheel (3) of a vehicle, said method involving an initial-estimate step (a) during which a first value (Angle1) indicative of the absolute angular position of said steering wheel (3) is evaluated by a first model based on analyzing a first vehicle running dynamic parameter, such as the speed differential of the wheels of one wheelset, a second-estimate step (b) during which a second value (Angle2) indicative of the absolute angular position of said steering wheel is evaluated by a second model based on analyzing a second dynamic parameter, such as the yaw rate, followed by a checking step (c) during which the difference between the first value (Angle1) and the second value (Angle2) is compared against a predetermined consistency threshold (S) in order to decide, through suitable weighting, whether said values are to be considered or excluded.

主权项

1. A method of determining an absolute angular position of a steering wheel of a vehicle with a vehicle computer, the method comprising:
providing the vehicle computer with at least one predetermined coherence threshold value (S), at least one first dynamic running parameter of the vehicle, and at least one second dynamic running parameter of the vehicle; controlling the steering wheel of the vehicle with the following steps: a step (a) comprising first estimation of an absolute position during which a first value (Angle1) which is representative of the absolute angular position of said steering wheel is evaluated by the vehicle computer using a first model based on an analysis of said at least one first dynamic running parameter of the vehicle; a step (b) comprising second estimation of the absolute position during which a second value (Angle2), which is representative of the absolute angular position of said steering wheel, is evaluated by the vehicle computer using a second model based on analysis of said at least one second dynamic running parameter the vehicle, wherein the second model is distinct from the first model, and wherein both the first value (Angle 1) and the second value (Angle2) are theoretically estimated absolute angular positions that are not measured by a vehicle sensor; and a verification step (c) during which the vehicle computer calculates a difference between the first value (Angle1) and the second value (Angle2) and compares the difference with the predetermined coherence threshold (S) which represents a same physical quantity of the absolute angular position of the steering wheel of the vehicle.