Invention Grant
- Patent Title: Transmission with L1-L2 shift method while engine braking
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Application No.: US14959258Application Date: 2015-12-04
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Publication No.: US10113639B2Publication Date: 2018-10-30
- Inventor: Scott A. Kline , Patrick M. Gibson , Raj Kommareddy , Roberto Diaz
- 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: F16H61/686
- IPC: F16H61/686 ; F16H61/02 ; F16H61/06 ; F16H61/21 ; F16H61/04

Abstract:
A transmission includes a stationary member, an input member, and gear sets each having a plurality of nodes. The transmission includes a first clutch that connects a node of one gear set to the stationary member to establish an L1 mode, and a second clutch that connects a node of another gear set to the stationary member to establish a 2L mode. A SOWC is connected between nodes of two gear sets, and a controller, in response to a requested shift L1-L2 shift while engine braking, executes a method to release the first clutch and thereby enters a neutral mode. The SOWC is released when slip across the first clutch exceeds a first threshold, then the first clutch reapplied when a SOWC slip level exceeds another threshold to thereby enter a 1st gear freewheeling mode. The second clutch is reapplied to enter the L2 mode and resume engine braking.
Public/Granted literature
- US20170159815A1 TRANSMISSION WITH L1-L2 SHIFT METHOD WHILE ENGINE BRAKING Public/Granted day:2017-06-08
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