Invention Application
- Patent Title: METHOD FOR CONTROLLING THE INTERNAL ELECTRONIC RANGE SELECTION FOR A 9 SPEED AUTOMATIC TRANSMISSION
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Application No.: US15648866Application Date: 2017-07-13
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Publication No.: US20190017592A1Publication Date: 2019-01-17
- Inventor: Todd R. Berger , David C. Webert , Roberto Diaz , David H. Moiseev , Joseph V. Pittiglio , Dustin A. Nygaard
- Applicant: GM Global Technology Operations LLC
- Main IPC: F16H61/12
- IPC: F16H61/12 ; F16H61/30

Abstract:
A method for controlling internal electronic range selection for an automatic transmission includes: confirming if a range change command has been ordered from a current transmission operating state; verifying expected performance from at least first and second mode valves and a park servo are present in the current transmission operating state prior to allowing a range change event; during the range change event: generating proactive commands including ordering a reduction in a hydraulic system pressure; and identifying if an unexpected event is detected; and following completion of the range change event confirming expected performance is obtained from at least the first and second mode valves and the park servo to achieve a driver intended state.
Public/Granted literature
- US10514094B2 Method for controlling the internal electronic range selection for a 9 speed automatic transmission Public/Granted day:2019-12-24
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