Patent · US Active

Method for detecting damage in the shift-control actuator of an automated manual transmission

US7890238B2 · kind B2 · utility

0Cited by

4References

13Claims

0Family size

Assignee

Schaeffler Technologies AG & Co. KG · DE

Inventors

Markus Klump · Bühl, DE
Stefan Winkelmann · Bühl, DE
Marian Preisner · Laufenburg (Baden), DE
Reinhard Berger · Bühl, DE

Key dates

Filing date	Oct 22, 2005
Grant date	Feb 15, 2011
Priority date	—
Expiry date	May 13, 2028

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16H2061/2823
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A method for diagnosing damage in the shift control actuator of an automated manual transmission, involving at least one of the following steps: (a) determining a shift control actuator is damaged if an actual period needed for synchronizing a gear differs from a nominal time period for synchronizing the gear; (b) moving a shift-control actuator to a limit stop after selection of a gear, and determining a shift-control actuator is damaged if the limit stop that has been reached is an internal limit stop of the shift-control actuator and not a gear transmission limit stop; (c) determining the shift-control actuator is damaged if an actual speed during the overlap phase is not within a speed range within which the engine speed is expected to lie during the overlap phase.

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