Method for controlling an automatic gearbox of a motor vehicle in the event that the gas/pedal is spontaneously released

US6879900B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Markus Henneken · Kreßbronn, DE
• Friedemann Jauch · Meckenbeuren, DE
• Franz Schuler · Kreßbronn, DE
• Thomas Mauz · Kreßbronn, DE
• Michael Kiefer · Rochester, US

Key dates

• Filing date: Nov 7, 2001
• Grant date: Apr 12, 2005
• Expiry date: Dec 7, 2021

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2061/163
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A method for controlling an automatic transmission of a motor vehicle in the event of a spontaneous gas/pedal release (FastOff). The automatic transmission is driven by an internal combustion engine which can be influenced by an accelerator pedal and a signal proportional to a pedal position is fed to an electronic transmission control in which shifting characteristic field is stored and the spontaneous gas/pedal release (FastOff) is detected and an upshift block (FFO=1) is activated when a pedal position gradient (PSTG) falls below a pedal gradient threshold (KF_PSTG). The mode of the upshift block (FFO=1) is removed when a traction operation is detected when an actual engine torque (MMM) exceeds a push-pull line (KL_ZS) stored as a function of a value equivalent to an engine rotational speed (NMO) in dependence on a vehicle acceleration/deceleration (AIST) dependent on an overall tractional resistance (GFW) and pedal gradient thresholds (KW_PSTGPOS, KW_PSTGNEG).