Arrangement for controlling the slip of an automatic friction clutch

US5322150A · kind A · utility

Assignee

• Fichtel & Sachs · DE

Inventors

• Hans-Joachim Schmidt-Brucken · Helmstedt, DE
• Thomas Kuhn · Heilbronn, DE

Key dates

• Filing date: Dec 30, 1991
• Grant date: Jun 21, 1994
• Expiry date: Dec 30, 2011

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16D2500/70668
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

A slip control loop (13) is proposed which compares the actual differential speed between input and output speed of a friction clutch (5) of a motor vehicle with a desired differential value and adjusts a positioning drive (7) of the clutch (5) according to the desired differential speed. To increase the accuracy of control, a desired position signal from a clutch characteristic curve memory (25) is additively superimposed in the sense of an influencing variable on the desired position signal s' calculated by a controller (19) of the slip control loop (13). The clutch characteristic curve memory (25) stores the desired position signal s" as a function of the clutch moment which can be transmitted in this position and is addressed according to the instantaneous engine moment determined, for example, via an engine characteristic map (27). During a load change of the engine (1), the clutch (5) is adjusted to the expected moment before a significant change in the actual differential speed occurs. The controller (19) has an integrating controller property so that the integral portion of the desired signal s' is zero when the dimensioning of the clutch characteristic curve stored in the …