Gm Global Technolgoy Operations, Inc.

Allen G Schroeder

Thaddeus Schroeder

Janet S Goings

Sam M Karadsheh

Ronald T Golebiewski

Charles H Huebner

A noncontacting automotive steering angle sensor involving the application of a two element magnetoresistive sensor to an otherwise conventional rack and pinion steering system. The rack is directly coupled to the steerable wheels, and the sensor is integrally mounted in a spring-loaded rack contacting mechanism (contact shoe) used to maintain a meshing engagement between the pinion and the rack. A variable permeability surface is formed on the surface of the rack along the travel path of the sensor such that axial movement of the rack differentially varies the magnetic flux density detected by each element of the sensor. A detector circuit comprising a bridge or simple voltage divider responsive to the differential resistances of the sensor elements develops an electrical signal indicative of the rack position.

Noncontacting position sensor for an automotive steering system

To reduce the potential magnitude necessary to break down the distributor arc gap between the distributor movable output electrode carried by the distributor rotor and each of the stationary output electrodes of the distributor cap, a distributor movable output electrode of an electrically conductive material having a cross-sectional area so selected that the output tip is heated to incandescence by arc current is employed and is located within a surrounding thermal shield member of an electrically nonconductive and heat insulating material.

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Livonia, MI, United States of America

Allen G Schroeder