Patent · US Active

Hydraulic system for an automatic transmission

US8141355B2 · kind B2 · utility

1Cited by

5References

9Claims

0Family size

Assignee

Schaeffler Technologies AG & Co. KG · DE

Inventors

Reinhard Stehr · Bogen, DE
Eric Muller · Contz-les-Bains, FR
Jochen Pfister · Strasbourg, FR
Roshan Willeke · Karlsruhe, DE

Key dates

Filing date	Jul 28, 2008
Grant date	Mar 27, 2012
Priority date	—
Expiry date	Jul 10, 2030

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16H2312/14
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A hydraulic system for an automatic transmission operatively connected to an internal combustion engine that is operable in a start-stop mode. The hydraulic system includes a hydraulic energy source to supply the hydraulic system with hydraulic energy, the hydraulic energy source including at least one electrically driven hydraulic pump to supply the hydraulic system with hydraulic energy during a stopping phase of the internal combustion engine. To achieve a reduction in fuel consumption and CO2 emissions, provision is included to enable the electrically driven hydraulic pump to be switched on in addition to a mechanically driven hydraulic pump, as needed during an operating phase of the internal combustion engine.

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