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:
Jul. 08, 2003
Filed:
Oct. 02, 2001
Eric Edward Krueger, Ann Arbor, MI (US);
Raymond Kurt Schubert, Mountain View, CA (US);
Keith Wayne Beyer, Novi, MI (US);
Delphi Technologies, Inc., Troy, MI (US);
Abstract
A traction control for a motor vehicle responds to detection of a rough road surface so as to shift control away from propulsion power reduction and toward brake control to an over-spinning driven wheel when the rough road surface is detected. This better adapts the traction control to a road surface that may have a high coefficient of friction but produces intermittent loss of traction due to wheel hop or normal force fluctuations due to the rough road surface. The lower power reduction is obtained by increasing a target brake pressure used to derive a brake pressure error signal from which from which a power reduction command is derived. A delta target brake pressure may also be increased to provide a higher target velocity for the driven wheel propulsion. For even higher levels of road roughness, the traction control reduces the gain of time derivative of a difference between a rotational wheel acceleration of the driven wheel and an undriven wheel rotational acceleration that contributes to the brake modulation, since wheel accelerations are of less use in controlling traction on such a road surface.