Invention Grant
- Patent Title: Transmission gear shifting
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Application No.: US14941004Application Date: 2015-11-13
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Publication No.: US09651145B1Publication Date: 2017-05-16
- Inventor: Brian H. Fiore , Matthew Pruski , Bryan Williams , Jason Mallory
- 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 IP Law
- Main IPC: F16H61/04
- IPC: F16H61/04

Abstract:
A fixed-gear transmission including a plurality of planetary gear sets and a plurality of clutches is described. A method for controlling the fixed-gear transmission includes commanding a first iteration of a skip-at-sync transmission shift and monitoring clutch slip of an oncoming holding clutch associated with the skip-at-sync transmission shift during execution of the shift, which includes monitoring synchronization of the on-coming holding clutch and a maximum clutch slip overshoot value. A progressive clutch pressure ramp rate for the oncoming holding clutch is adaptively controlled in response to the clutch synchronization of the on-coming hold clutch during execution of a subsequent iteration of the skip-at-sync transmission shift.
Public/Granted literature
- US20170138468A1 TRANSMISSION GEAR SHIFTING Public/Granted day:2017-05-18
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