Transmission control with a fuzzy logic controller

US5390117A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Friedrich Graf · Eggenfelden, DE
• Gregor Probst · Landshut, DE
• Hans-Georg Weil · Starnberg, DE

Key dates

• Filing date: Jun 28, 1993
• Grant date: Feb 14, 1995
• Expiry date: Jun 28, 2013

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S706/90
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A control for a motor vehicle transmission automatically shifts transmission gears as a function of at least a driving pedal position and vehicle speed on the basis of shifting performance graphs stored in memory, and takes a load state of the motor vehicle and the driving style of the driver into account. A fuzzy logic controller with a rule base evaluates various signals characterizing driving states of the motor vehicle, and thereupon generates the following control signals: a first correcting signal characterizing the load state of the motor vehicle, and a second correcting signal characterizing the driving style, bringing about a switchover to corresponding shifting performance graphs; and an inhibit signal preventing shifting events that would produce a dynamically unfavorable driving state.