Invention Grant
- Patent Title: Method for operating a multi-step automatic transmission
- Patent Title (中): 多步自动变速器的运行方法
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Application No.: US12107860Application Date: 2008-04-23
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Publication No.: US08437928B2Publication Date: 2013-05-07
- Inventor: Christian Popp , Reinhard Vollmar
- Applicant: Christian Popp , Reinhard Vollmar
- Applicant Address: DE Friedrichshafen
- Assignee: ZF Friedrichshafen AG
- Current Assignee: ZF Friedrichshafen AG
- Current Assignee Address: DE Friedrichshafen
- Agency: Davis & Bujold, PLLC
- Priority: DE102007021193 20070505
- Main IPC: G06F17/00
- IPC: G06F17/00

Abstract:
A method for operating a multi-step automatic transmission arranged in a drive train of a vehicle with a combustion engine. When downshifting from the third gear ratio to a second gear ratio, higher inertia must be shifted than when shifting from the third gear ratio to the first gear ratio. Upon a demand for a coasting downshift from the third gear ratio to the second gear ratio or to the first gear ratio with no performance demand on the combustion engine, the coasting downshift to the second gear ratio is not executed and the first gear ratio is engaged when the requirements for downshifting to the first gear ratio are met.
Public/Granted literature
- US20080275613A1 METHOD FOR OPERATING A MULTI-STEP AUTOMATIC TRANSMISSION Public/Granted day:2008-11-06
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