Invention Grant
- Patent Title: Method for determining the drainage control of a hydraulic switching element of a transmission
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Application No.: US14934259Application Date: 2015-11-06
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Publication No.: US09695890B2Publication Date: 2017-07-04
- Inventor: Sven Bieber , Jan-Frederik Kuhn , Marcus Hiemer , Stephan Schinacher , Mario Brugger , Markus Lukassek
- Applicant: ZF Friedrichshafen AG
- Applicant Address: DE Friedrichshafen
- Assignee: ZF Friedrichshafen AG
- Current Assignee: ZF Friedrichshafen AG
- Current Assignee Address: DE Friedrichshafen
- Agency: Davis & Bujold, PLLC
- Agent Michael J. Bujold
- Priority: DE102014222947 20141111
- Main IPC: F16D48/06
- IPC: F16D48/06

Abstract:
A method for determining a draining behavior of a hydraulically actuated transmission shifting element. By applying actuating pressure, the shifting element is changed from a completely drained, open operating condition to a completely filled closed operating condition, and the reference filling time, until the closed condition has been reached, is determined. Upon recognition of the closed condition, then by adjusting the actuating pressure for a predefined draining time, the shifting element is changed to its open condition and, thereafter, again completely filled and closed. Upon recognition of the closed condition, the shifting element is actuated direction toward the open condition by reducing the actuating pressure. Then, before completely opening, the shifting element is again returned to its closed operating condition and the filling time, until the partially drained shifting element has reached the completely filled and closed operating condition, is determined.
Public/Granted literature
- US20160131249A1 METHOD FOR DETERMINING THE DRAINAGE CONTROL OF A HYDRAULIC SWITCHING ELEMENT OF A TRANSMISSION Public/Granted day:2016-05-12
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