Invention Grant
US08965653B2 Partial prefill of clutch for coast downshift conditions in a vehicle
有权
离合器的部分预填充用于车辆中的滑行降档条件
- Patent Title: Partial prefill of clutch for coast downshift conditions in a vehicle
- Patent Title (中): 离合器的部分预填充用于车辆中的滑行降档条件
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Application No.: US13949295Application Date: 2013-07-24
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Publication No.: US08965653B2Publication Date: 2015-02-24
- Inventor: Kristopher J. Kokko , Dara Monajemi , David C. Webert , Amanda P. Igel
- Applicant: GM Global Technology Operations LLC
- Applicant Address: US MI Detroit
- Assignee: GM Global Technology Operations LLC
- Current Assignee: GM Global Technology Operations LLC
- Current Assignee Address: US MI Detroit
- Agency: Quinn Law Group, PLLC
- Main IPC: G06F7/00
- IPC: G06F7/00 ; F16D48/06 ; B60W10/02 ; B60W10/10

Abstract:
A vehicle transmission includes a plurality of oncoming clutches that are hydraulically-actuated. A controller is operatively connected to the plurality of oncoming clutches. An algorithm stored on and executable by the controller causes the controller to determine if at least one predefined coast condition is met and identify the plurality of oncoming clutches configured to be engageable during a downshift event from an initial gear ratio to respective other gear ratios. The initial gear ratio is greater than each of the respective other gear ratios. The algorithm causes the controller to generate a first pressure command to at least partially pressurize a first one of the oncoming clutches to a first staging pressure (PS1) if the at least one predefined coast condition is met prior to the downshift event. The first staging pressure (PS1) is defined as a first return spring pressure (PR1) minus a first variable correction factor (CF1).
Public/Granted literature
- US20150032341A1 PARTIAL PREFILL OF CLUTCH FOR COAST DOWNSHIFT CONDITIONS IN A VEHICLE Public/Granted day:2015-01-29
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