Method for controlling an automatic gearbox

US6285940A · kind A · 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: Mar 13, 2000
• Grant date: Sep 4, 2001
• Expiry date: Mar 13, 2020

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H59/78
• WIPO field: Transport
• WIPO sector: Mechanical engineering

Abstract

When a cold start condition exists, an electronic gear control (4) calculates for an automatic transmission (3) driven by an internal combustion engine (1) the energy throughput of the internal combustion engine (1). The energy throughput is added up and compared with a limit value. The shift points of the automatic transmission (3) are pushed up to higher values as long as the calculated value remains less than the limit value.