Automatic steering system for vehicle

Details Automatic steering system for vehicle Automatic steering system for vehicle

1998-04-14

1999-08-03

Hurley, Kevin

Motor vehicles

With device for programmably operating vehicles steerable...

180446, 701 41, B62D 100

Patent

active

059312530

ABSTRACT:
The elimination of a steering angle detector from an automatic steering system including an electric motor used as an actuator is accomplished and the steering angle of a wheel is calculated based on the rotational angle of the electric motor. In the electric motor, if a terminal voltage is represented by u; a supplied current is j; a resistance is R; an inductance is L; a rotational angle is .alpha.; and a constant depending on characteristic of the electric motor is K, the terminal voltage u is represented by the following equations: ##EQU1## If this equation is solved with respect to the rotational angle .alpha. and the inductance L having a small value is omitted, the rotational angle .alpha. is given according to the following equation: ##EQU2## The rotational angle .alpha. of the electric motor and the steering angle of the wheel are in a proportional relationship to each other and hence, if the rotational angle .alpha. is calculated from the terminal voltage u and the supplied current j to the electric motor, the steering angle of the wheel can be found. Thus, a steering angle detector can be eliminated.

REFERENCES:
patent: 4735274 (1988-04-01), Good et al.
patent: 4931930 (1990-06-01), Shyu et al.
patent: 5742141 (1998-04-01), Czekaj
patent: 5764015 (1998-06-01), Shimizu et al.

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