Patent · US Active

Transmission control circuit

US9752675B2 · kind B2 · utility

0Cited by

1References

16Claims

0Family size

Assignee

Deere & Company · US

Inventors

Helmut Schaefer · Pirmasens, DE
Guenter Rheinheimer · Frankelbach, DE
Steffen Frassek · Mannheim, DE

Key dates

Filing date	Sep 22, 2015
Grant date	Sep 5, 2017
Priority date	—
Expiry date	Nov 9, 2035

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16H2061/1232
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A transmission control circuit for controlling a system pressure provided by a pressure pump in a transmission. The circuit includes a pressure control valve and an electronic control unit. Load states and operating states of the working machine can be detected by the control unit and transmission input torque limits associated with the load states and state values representing at least one first operating state and state values representing at least one second operating state are stored therein. The first operating state corresponds with the maximum system pressure and the second operating state corresponds with a reduced system pressure compared to the maximum system pressure. The circuit includes a pressure limiting valve activated by the control unit to overrule the pressure control valve in order to variably set the reduced system pressure.

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