Patent · US Expired

Motor vehicle having an automatically shifting transmission

US5131293A · kind A · utility

19Cited by

8References

7Claims

0Family size

Assignee

Dr. Ing. h.c. F. Porsche AG · DE

Inventors

Friedrich-Wilhelm Kaiser · Rutesheim, DE
Stephan Pelters · Tiefenbronn, DE
Willi Seidel · Lambach, DE

Key dates

Filing date	Aug 20, 1990
Grant date	Jul 21, 1992
Priority date	—
Expiry date	Aug 20, 2010

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16H2061/0241
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

An arrangement for controlling in a motor vehicle an electrohydraulically controlled, automatically shifting transmission driven by an internal-combustion engine. The transmission has several shifting programs optimized according to different design criteria which may be selected either manually by the driver or automatically. Using a temperature sensor, a cold-start condition of the motor vehicle is sensed on the basis of which a transmission control system shifts at least for a limited time period according to a warmup shifting program in such a manner that the internal-combustion engine, under identical driving conditions, generates higher exhaust gas mass flows or exhaust gas energy flows than for gear positions shifted according to a consumption-optimized shifting program.

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