The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 02, 1993
Filed:
Oct. 24, 1990
David W Graber, Millington, MI (US);
Dennis C Eckhardt, Saginaw, MI (US);
Andrzej M Pawlak, Troy, MI (US);
Bryan L Faist, Frankenmuth, MI (US);
General Motors Corporation, Detroit, MI (US);
Abstract
A power steering unit has an electromagnetic mechanism controlled by a computer-based controller for varying the steering effort in accordance with vehicle speed. The same controller is used to adjust the steering effort in accordance with a calibration value to obtain steering effort uniformity. The calibration value is obtained by applying a force to a vehicle wheel and measuring the resulting torque on the steering wheel (or vice versa) and comparing the resulting force to a standard. Any deviation from the standard is stored in the controller as a correction factor. Alternatively, the characteristics of the steering gear and the power steering pump are measured and encoded on the unit when manufactured and the encoded values are read after assembly in a vehicle and used to calculate the correction factor which is then stored in the controller.