Patent · US Active

Method for controlling a continuously variable transmission for a vehicle

US10316964B2 · kind B2 · utility

0Cited by

4References

16Claims

0Family size

Assignee

ZF FRIEDRICHSHAFEN AG · DE

Inventors

Stefan Traub · Eppelheim, DE
Jan-Frederik KUHN · Friedrichshafen, DE
Martin LAUPHEIMER · Ravensburg, DE
Matthias Madlener · Hohentengen, DE
Marcus Hiemer · Karlsruhe, DE

Key dates

Filing date	Nov 22, 2017
Grant date	Jun 11, 2019
Priority date	—
Expiry date	Nov 22, 2037

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF16H2061/1264
WIPO fieldMechanical elements
WIPO sectorMechanical engineering

Abstract

A method of controlling a continuously variable transmission for a vehicle. The continuously variable transmission has a hydrostat with a position-regulating valve and is designed to co-operate in driving connection with a drive input shaft and a drive output shaft such that when the position-regulating valve is energized, the hydrostat is adjusted to accelerate the vehicle. The method includes monitoring the energization of the position-regulating valve cyclically by a safety function. The safety function is provided in order to recognize undesired energization of the position-regulating valve that leads to unwanted acceleration of the vehicle, and then to separate the transmission at least from the drive output shaft so as to prevent unwanted acceleration of the vehicle. The safety function is triggered at least when a limit value for the energization of the position-regulating valve is exceeded.

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