Method of simulating the performance of a vehicle on a road surface

US6754615B1 · kind B1 · utility

Assignees

• AVL DEUTSCHLAND GMBH · DE
• Dr. Ing. h.c. F. Porsche AG · DE

Inventors

• Stefan Germann · Lorsch, DE
• Harald Nonn · Weinheim, DE
• Wolfgang Kopecky · Worms, DE
• Georg Abler · Graz, AT
• Lothar Witte · Leinfelden, DE
• Hai Xuan · Lincoln, US
• Michael Pfeiffer · Pleasanton, US
• Peter Brodbeck · Mühlacker, DE

Key dates

• Filing date: Mar 9, 2000
• Grant date: Jun 22, 2004
• Expiry date: Mar 9, 2020

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T2270/86
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

Method of simulating the performance of a vehicle on a roadway on a power train test bed with the help of torque-controlled electric load machines mounted on the shafts of the power train of the vehicle and with the help of a computer with a vehicle model stored therein and a tire model simulating the slip-dependent friction, in which method the angular wheel speed is measured on at least one of the shafts, and the tire model determines a force transmitted from the tire to the roadway at this angular wheel speed on the basis of the tire model using a vehicle velocity and a tire normal force, and it also determines a setpoint torque for this force for the torque-controlled load machine mounted on this shaft, in such a way that a difference corresponding to the actual slip is established between the measured angular wheel speed and a nominal angular wheel speed value corresponding to the vehicle velocity used in the tire model and calculated in the vehicle model with feedback of the force transferred to the road surface.