Method for shifting a motor vehicle automatic transmission with a hydrodynamic torque converter when the vehicle comes to a stop

US7959536B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Markus Eisele · Friedrichshafen, DE
• Franz Sorg · Aalen, DE
• Harry Nolzen · Tettnang, DE
• Jürgen Blaser · Meckenbeuren, DE
• Thomas Vogt · Regensburg, DE

Key dates

• Filing date: Jun 7, 2006
• Grant date: Jun 14, 2011
• Expiry date: Oct 7, 2028

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2061/207
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A method of shifting an automatic transmission of a motor vehicle having a hydrodynamic converter (6). The method comprising the steps of detecting a presence of predetermined stopping conditions; determining that a driver of the motor vehicle intends to cause the motor vehicle to change from a driving state to a stopped state, based on the presence of one of the predetermined stopping conditions; and automatically shifting the automatic transmission (8) into a standby mode, before the driving state has concluded. The shifting into the standby mode typically occurs when a rotational speed of the hydrodynamic converter (6) decreases to less than a rotational speed (120) of a motor and the retarder apparatus (10), of the automatic transmission, is disengaged no later than a time by which shifting into the standby mode occurs.