Electronic steering wheel technique for passing information with

Details Electronic steering wheel technique for passing information with Electronic steering wheel technique for passing information with

1999-01-12

2000-04-25

Paladini, Albert W.

Electrical transmission or interconnection systems

Vehicle mounted systems

Automobile

307 38, 307 60, 701 36, 701 53, H04L 1210

Patent

active

060547782

ABSTRACT:
A steering wheel control system (10) that employs a method for passing push-button commands from a steering wheel to a vehicle system, wherein the method is not dependant upon the contact resistance of a sliding contact (32) located in the steering wheel column. The control system (10) includes a constant current source circuit (20) that generates a unique constant current corresponding to each command. The sliding contact (32) passes the constant current between the steering wheel and the vehicle system, and a calibrated resistance circuit (40) converts the unique constant current into a discrete voltage. The discrete voltage is also converted into a digital signal for use by a microcontroller (60) to activate the vehicle systems. The use of constant currents therefore avoids operational problems associated with decreases in the overall system noise margin due to large voltage drops across the sliding contact (32). Furthermore, the use of off-the-shelf constant current generation and conversion components allows for an overall reduction in system cost and increase in system reliability.

REFERENCES:
patent: 4628310 (1986-12-01), Reighard et al.
patent: 5289043 (1994-02-01), Marshall et al.
patent: 5762159 (1998-06-01), Matsuoka et al.
patent: 5878082 (1999-03-01), Kishigami
Co-pending U.S. Patent Application (Attorney Docket No. 20-0078) 09/228,591 (701/36).

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