Process and system for determination of friction/slip characteristics of road vehicle tires

US5653517A · kind A · utility

Assignee

• Mercedes-Benz Group AG · DE

Inventors

• Manfred Burckhardt
• Gerd Eilert · Schwaikheim, DE
• Rainer Freitag · Owen, DE
• Armin Mueller · Stuttgart, DE
• Reinhold Schoeb · Traunreut, DE
• Rainer Spiecker · Weingarten, DE
• Sinan Kazan · Eßlingen, DE
• Richard Zimmer · Fellbach, DE

Key dates

• Filing date: Mar 4, 1996
• Grant date: Aug 5, 1997
• Expiry date: Mar 4, 2016

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B60T2270/208
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

For the determination of the friction/slip characteristics of the tires of a road vehicle which is equipped with an antilock system designed for an individual wheel control, in an initial phase of a controlled braking, only the wheel brake of an individual vehicle wheel is acted upon by brake pressure and the latter is dimensioned so that the result is the initial retardation in accordance with the driver's wish. During this initial test phase of the braking, the absolute brake slip .lambda..sub.B as well as the friction utilization .mu..sub.B linked therewith is continuously determined as soon as, as a result of just the braking of the test wheel, the vehicle retardation z increases no further and/or the braked vehicle wheel is more strongly retarded than corresponds to a predetermined threshold value, the test braking is interrupted and the braking is continued by pressure action on the further vehicle wheels; corresponding test braking phases are carried out in cyclic sequence for all guidance wheels.