Average friction learning and average friction change estimation

US9085316B2 · kind B2 · utility

Assignee

• Steering Solutions IP Holding Corporation · US

Inventors

• Tao Yang · Zhejiang, CN
• Michael A. Eickholt · New Lothrop, US
• Steve Klein · Munger, US
• Tim Kaufmann · Aachen, DE
• Niharika P. Popy · Saginaw, US

Key dates

• Filing date: Jan 17, 2013
• Grant date: Jul 21, 2015
• Expiry date: Jul 25, 2033

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B62D5/0481
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A learning function is configured to determine a plurality of piecewise linear function coefficients based on measured data for an electric power-assisted steering (EPS) system. The measured data include a vehicle speed. The learning function is further configured to model a hysteresis loop of the EPS system using a piecewise linear function based on the plurality of piecewise linear function coefficients to determine an average friction. An average friction change compensator is configured to adjust friction-based EPS system compensation based on the average friction for a plurality of vehicle speed intervals of the vehicle speed.