Invention Grant
- Patent Title: Avoiding coasting downshift torque reversal in an automatic transmission
- Patent Title (中): 避免自动变速器中的降档扭矩反转
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Application No.: US11947251Application Date: 2007-11-29
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Publication No.: US08398516B2Publication Date: 2013-03-19
- Inventor: Mark A. Smith , Douglas R. Cecil , Michael Tarrant , Vince P. LaVoie
- Applicant: Mark A. Smith , Douglas R. Cecil , Michael Tarrant , Vince P. LaVoie
- Applicant Address: US MI Dearborn
- Assignee: Ford Global Technologies, LLC
- Current Assignee: Ford Global Technologies, LLC
- Current Assignee Address: US MI Dearborn
- Agency: MacMillan, Sobanski & Todd, LLC
- Agent James Dottavio
- Main IPC: B60W10/04
- IPC: B60W10/04

Abstract:
A method for controlling a coast down downshift that is produced in an automatic transmission by disengaging an off-going control element and engaging an oncoming control element, including the steps of determining a first desired pressure magnitude of the off-going control element and a first desired pressure magnitude of the oncoming control element, executing the current downshift using said first desired pressure magnitudes, determining during execution of the current downshift corrections of said first desired pressure magnitudes that occur during the current downshift, determining a second desired pressure magnitude of the off-going control element and a second desired pressure magnitude of the oncoming control element, using said corrections and the second desired pressure magnitude to determine a subsequent desired pressure magnitude of the off-going control element and a subsequent desired pressure magnitude of the oncoming control element, and executing a downshift using said subsequent desired pressure magnitudes.
Public/Granted literature
- US20090143196A1 Avoiding Coasting Downshift Torque Reversal in an Automatic Transmission Public/Granted day:2009-06-04
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