Method for controlling a high temperature operating mode of an electronically controlled automatic gearbox

US6466854B1 · 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 18, 2001
• Grant date: Oct 15, 2002
• Expiry date: Apr 18, 2021

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2061/0227
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a method for controlling a high-temperature operating mode of an automatic transmission wherein at least one value of an actual engine (CMO) or transmission (CGT) temperature is continuously measured. In the electronic control unit several gear shift control programs are stored and are accessed at normal operating temperatures according to an evaluation counter provided with a driving activity characteristic. It is proposed that the evaluation counter be provided with a high-temperature operating value (MAX(UDCHMMO, UDCHMGT)) with which is associated a gear shift program which also has temperature-lowering properties when the actual temperature value (CMO, CGT) is higher than a first limit value (MOMIN, GTMIN).