Method for controlling an automatic transmission

US6442467B1 · kind B1 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Franz Schuler · Kreßbronn, DE
• Wolfgang Vallaster · Meckenbeuren, DE
• Adolf Bucher · Kreßbronn, DE

Key dates

• Filing date: Mar 22, 2001
• Grant date: Aug 27, 2002
• Expiry date: Mar 22, 2021

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16H2061/0096
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

A method for controlling an automatic transmission having several gears in which a downshift to a lower gear is triggered when, during an actuation of the acceleration pedal toward an increase of the load input, a shifting characteristic line is exceeded. It is proposed to compare an accelerator pedal gradient signal (DKIG) with a presettable threshold value (DKIG_Limit) and to trigger a downshift already before the shifting characteristic line is exceeded when the actual value of the accelerator pedal gradient signal is great than the threshold value. This significantly reduces the reaction time of the transmission.