Method for measuring the absolute steering angle of steering...

Data processing: vehicles – navigation – and relative location – Vehicle control – guidance – operation – or indication – Vehicle subsystem or accessory control

Reexamination Certificate

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C180S006200, C180S443000, C280S005510, C702S151000

Reexamination Certificate

active

07050895

ABSTRACT:
An absolute steering angle of a steering shaft for a vehicle is measured using rotatable bodies that rotate together with the steering shaft at respective predetermined rotation ratios. A ΨM′ value is obtained by measuring a relative rotational angle Ψ′ of a first rotatable body and a θM′ value is obtained by measuring the relative rotational angle θ′ of a second rotatable body. θC's are obtained by calculating relative rotational angles θ's of the second rotatable body corresponding to the ΨM′ value, using the relation between Ψ′ and θ′. A frequency i-value of the first rotatable body is obtained by comparing the θCs to the θM′ value. An absolute steering angle Φ1of the steering shaft is obtained based on the relation between absolute rotational angles Ψ and Φ, after Ψ is obtained using the i-value.

REFERENCES:
patent: 5930905 (1999-08-01), Zabler et al.
patent: 6466889 (2002-10-01), Schodlbauer
patent: 6848187 (2005-02-01), Ito et al.
patent: 6862551 (2005-03-01), Kang et al.
patent: 6941241 (2005-09-01), Lee et al.
patent: 2005/0102078 (2005-05-01), Lee et al.
patent: 2005/0137768 (2005-06-01), Lee
patent: 2005/0159868 (2005-07-01), Lee

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