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:
May. 30, 1995
Filed:
Apr. 21, 1994
Uwe Adler, Schweinfurt, DE;
Hans-Jurgen Drexl, Schonungen, DE;
Dieter Lutz, Schweinfurt, DE;
Franz Nagler, Ottendorf, DE;
Martin Ochs, Schweinfurt, DE;
Stefan Schiebold, Schweinfurt, DE;
Hans-Joachim Schmidt-Brucken, Geldersheim, DE;
Wolfgang Thieler, Hassfurt, DE;
Michael Wagner, Niederwerrn, DE;
Holger Westendorf, Hambach, DE;
Rainer Wychnanek, Madenhausen, DE;
Mannesmann Aktiengesellschaft, Dusseldorf, DE;
Abstract
An apparatus for determining a critical driving torque and information representing the coefficient of friction at the wheel grip limit for a vehicle having a plurality of driven wheels. It is suggested that torque control devices be assigned to at least two of the driven wheels so that the ratio of the driving torques of the two driven wheels can be varied, wherein torque sensing device generate a torque signal corresponding to the magnitude of at least the greater of the driving torques of the driven wheels. A wheel slip sensing device is associated with the driven wheels and detects an increase in the slip of the wheel with the greater driving torque beyond a predetermined limit. The information on the coefficient of friction is generated depending on the magnitude of the detected driving torque of the wheel whose slip exceeds the limit. To determine the information concerning the coefficient of friction, the distribution of driving torque between the front axle and rear axle is periodically increased in an alternating manner.