Invention Grant
- Patent Title: Double transition shift control in an automatic powershifting transmission
- Patent Title (中): 自动功率变换传输中的双转换换档控制
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Application No.: US13934770Application Date: 2013-07-03
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Publication No.: US08718886B2Publication Date: 2014-05-06
- Inventor: John Andrew Byerly , John P. Kresse , Mark A. Rains , Jeffrey K. Runde
- Applicant: Allison Transmission, Inc.
- Applicant Address: US IN Indianapolis
- Assignee: Allison Transmission, Inc.
- Current Assignee: Allison Transmission, Inc.
- Current Assignee Address: US IN Indianapolis
- Agency: Woodard, Emhardt, Moriarty, McNett & Henry LLP
- Main IPC: G06F7/00
- IPC: G06F7/00

Abstract:
A system and method for controlling double transition shifts in an automatic transmission having multiple gear sections. During a double transition shift, the system performs simultaneous closed loop control of the primary oncoming clutch in the primary gear section and the secondary off-going clutch of the secondary gear section. Before the input shaft of the secondary gear section is fully pulled down or the secondary off-going clutch becomes overheated, the system switches closed loop control of the input shaft to the secondary on-coming clutch of the secondary gear section. The system utilizes model-based calculations to determine the initial clutch pressure settings when a clutch enters closed loop control.
Public/Granted literature
- US20140019023A1 DOUBLE TRANSITION SHIFT CONTROL IN AN AUTOMATIC POWERSHIFTING TRANSMISSION Public/Granted day:2014-01-16
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