Invention Grant
- Patent Title: Electro-hydraulic control including blocking features for multi-speed automatic transmission
- Patent Title (中): 电液控制包括多速自动变速器的阻塞功能
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Application No.: US14549195Application Date: 2014-11-20
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Publication No.: US09447868B2Publication Date: 2016-09-20
- Inventor: Bryan Hagelskamp
- 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: Barnes & Thornburg LLP
- Main IPC: F16H31/00
- IPC: F16H31/00 ; F16H61/00 ; F16H61/02 ; F16H61/12 ; F16H59/68

Abstract:
A control for a multi-speed automatic vehicle transmission is provided. Electrical and hydraulic components are provided, including pressure control or “trim” valve systems in fluid communication with shift valves and electrohydraulic actuators to selectively engage and disengage the transmission clutches or other shift mechanisms. Pressure switches are provided for the trim valves and shift valves. The fluid connections between the trim valve systems and the shift valve systems are configured to reduce the total number of valves and fluid passages required and to reduce the size of at least one of the valves. Clutch blocking features are provided. Power off limp home and reduced engine load at stop features are provided in all forward ranges, and control of double transition shifts is also provided.
Public/Granted literature
- US20150075315A1 Electro-Hydraulic Control Including Blocking Features for Multi-Speed Automatic Transmission Public/Granted day:2015-03-19
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