Method for detecting and correcting vehicle reference speed and vehicle system

US9903308B2 · kind B2 · utility

Assignee

• AUDI AG · DE

Inventors

• Arne Cornils · Frankfurt, DE
• Manuel Kasten · Hattersheim, DE
• Nikolaus Reim · Brackenheim, DE

Key dates

• Filing date: Dec 7, 2011
• Grant date: Feb 27, 2018
• Expiry date: Dec 7, 2031

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T2270/611
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A method for detecting and correcting vehicle reference speed, in particular when the speed undergoes a controlled reduction due to drag or regeneration torque, of an all-wheel drive vehicle. The longitudinal acceleration of the motor vehicle, and the wheel accelerations are determined by sensors. The method is to provide reliable determination of the vehicle reference speed and the initiation of corrective measures once a controlled reduction has been recognized. The steps include filtering the wheel accelerations, filtering the longitudinal accelerations, forming a corrected longitudinal acceleration by applying a safety offset and a correction offset to the filtered longitudinal acceleration, and temporal integration of the difference between the corrected longitudinal acceleration and the respective wheel acceleration. In the event a threshold value of the absolute value of the difference is exceeded during a predetermined time interval with a preset number of wheels, step for adjusting the correction offset are initiated.