Method for determining the rotational speed of the main shaft of a transmission, and transmission comprising a device for detecting rotational speed

US8050832B2 · kind B2 · utility

Assignee

• ZF FRIEDRICHSHAFEN AG · DE

Inventors

• Kim Führer · Gettorf, DE
• Thomas Puth · Friedrichshafen, DE
• Frank Gessler · Obergünzburg, DE

Key dates

• Filing date: Apr 25, 2007
• Grant date: Nov 1, 2011
• Expiry date: Nov 26, 2028

Classification

• Technology area (CPC G): Physics
• CPC primary: G01P3/48
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The present invention relates to a method for determining the rotational speed of the main shaft (3) of a transmission in which the main shaft (3) is connected to an output shaft (4) via a shiftable planetary gear (17), whereby the main shaft (3) is connected in a rotationally fixed manner to the sun gear (18) and the output shaft (4) is connected in a rotationally fixed manner to the planet carrier (20). The steps of the method are picking up the rotational speed (nHohlrad) of the ring gear (22), picking up the rotational speed (nAbtrieb) of the output shaft or the planet carrier (20), and computing the rotational speed (nHauptwelle) of the main shaft (3) from the rotational speed (nHohlrad) of the ring gear and the rotational speed (nAbtrieb) of the output shaft or the planet carrier (20). The present invention further relates to a transmission having a rotational speed pickup device.