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:
Aug. 21, 2018
Filed:
Nov. 07, 2016
Ford Global Technologies, Llc, Dearborn, MI (US);
Dexin Wang, Livonia, MI (US);
Timothy Gerard Offerle, Saline, MI (US);
Douglas Scott Rhode, Farmington Hills, MI (US);
Taehyun Shim, Ann Arbor, MI (US);
Yijun Li, Dearborn, MI (US);
FORD GLOBAL TECHNOLOGIES, LLC, Dearborn, MI (US);
Abstract
A controller for a power steering system estimates rack force and its derivative, such as based on lateral acceleration, yaw rate, vehicle speed, or other parameters. A control torque is calculated based on the rack force, its derivative, and the vehicle speed and is summed with an input torque from the driver to determine an amount of assist torque to provide. The control torque may be a shape function that has a sign determined by the sign of the derivative and a magnitude that decreases from a maximal value with increase in the magnitude of the rack force. The maximal value may be determined according to vehicle speed.