US Patent 7632211 Shift control method for an automatic gearbox

Patent 7632211 was granted and assigned to ZF Friedrichshafen on December, 2009 by the United States Patent and Trademark Office.

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Is a

Patent

Patent attributes

Current Assignee

ZF Friedrichshafen

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

7632211

Date of Patent

December 15, 2009

Patent Application Number

11814301

Date Filed

December 2, 2005

Patent Primary Examiner

‌

Tisha D Lewis

Patent abstract

A shift control method of a range group transmission with a multi-speed main transmission, which connects with a drive motor, via a clutch (K) and an input shaft. A transmission brake optionally engages the input shaft. At least a two range group is located downstream of the main transmission. A range change shift is accomplished by changing a gear of the main transmission and the range group. The shifting sequence is accelerated by: reducing motor torque and disengaging the clutch (K); disengaging a previous range group gear; synchronizing a new range group gear; disengaging a previous main transmission gear; engaging the new range group gear; synchronizing a new main transmission gear; engaging the new main transmission gear; and engaging the clutch (K) and increasing the motor torque, such that synchronization of the new gear occurs by influencing the input shaft of the main transmission.