Method for controlling the automatic gearbox of a motor vehicle during spontaneous release of the accelerator pedal

US6527672B1 · kind B1 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Markus Henneken · Kreßbronn, DE
• Friedemann Jauch · Meckenbeuren, DE
• Kai-Uwe Herbster · Tettnang, DE
• Franz Schuler · Kreßbronn, DE
• Thomas Mauz · Kreßbronn, DE

Key dates

• Filing date: Apr 19, 2001
• Grant date: Mar 4, 2003
• Expiry date: Apr 19, 2021

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S477/905
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A method for controlling an electronically controlled automatic transmission wherein the spontaneous gas/pedal release (FastOff) is detected and an upshift prevention system is activated when a pedal position gradient (PSTG) is lower than a pedal position gradient threshold (KF_PSTG); the state of the upshift prevention system (FFO=1) is active until a) a traction operation is detected when the actual pedal position value (PST) exceeds a traction-thrust characteristic line (KF_ZS) and of an acceleration potential value (FBN) equivalent to a road gradient value; and/or b) a time (T1, T2) has elapsed after a defined time period (THSV1, THSV2) wherein the state of the upshift prevention system (FFO=1) is abandoned.