Patent · US Expired

Method for controlling an automatic transmission

US6366843B1 · kind B1 · utility

7Cited by

6References

13Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Ralf Dreibholz · Meckenbeuren, DE
Martin Vohmann · Jeffery Road, DE
Gerd Frotscher · Friedrichshafen, DE

Key dates

Filing date	May 24, 2001
Grant date	Apr 2, 2002
Priority date	—
Expiry date	May 24, 2021

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16H63/502
WIPO fieldTransport
WIPO sectorMechanical engineering

Abstract

A method for controlling an automatic transmission driven by an internal combustion engine is proposed in which a shift from a first to a second transmission ratio occurs as a pull upshift by a first clutch opening and a second clutch closing and electronic transmission control unit controls via electromagnetic valves the pressure curve of the first and of the second clutch during the shifting operation. The shifting operation is divided into different shifting phases, an engine intervention taking place within the gradient-adjustment (GE), the sliding (GL), the gradient-reduction (GA) and the closing (S) phases, an engine torque being reduced by an engine intervention factor (mdzegs) being transferred from the transmission control device to an engine control device of the internal combustion engine.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.