Automatic gearbox with a downshift function

US6370464B1 · kind B1 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Kai-Uwe Herbster · Tettnang, DE
• Franz Schuler · Kreßbronn, DE

Key dates

• Filing date: Jun 1, 2000
• Grant date: Apr 9, 2002
• Expiry date: Jun 1, 2020

Classification

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

Abstract

For an automatic transmission (3) a downshift function is proposed in which, with the actuation of a brake pedal, a new downshift point (RA(NEU)) is calculated when the throttle valve is closed by adding to a basic downshift point (RS(ORD)) a characteristic variable (K1) wherein the characteristic variable (K1) is determined from a driving activity (FA) and a calculated brake pressure via a characteristic field.