Invention Grant
- Patent Title: Electronic transmission range selection subsystem in a hydraulic control system for an automatic transmission
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Application No.: US14570329Application Date: 2014-12-15
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Publication No.: US09688257B2Publication Date: 2017-06-27
- Inventor: Vijay A. Neelakantan , Joshua McDonough , Matthew R. Knoth , Philip C Lundberg
- 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
- Main IPC: B60T13/68
- IPC: B60T13/68 ; B60T13/66

Abstract:
A hydraulic control system for a transmission includes a source of pressurized hydraulic fluid, a park servo connected to a park mechanism, the park servo having a park side, an out-of-park side, and a biasing member disposed on the park side. A first valve assembly includes a first inlet port in fluid communication with the source of pressurized hydraulic fluid, a first outlet port, and a first valve for selectively allowing fluid communication between the first inlet port and the first outlet port. A second valve assembly includes a second inlet port in direct fluid communication downstream of the first valve assembly, a second outlet port in direct fluid communication with the out-of-park side of the park servo, and a second valve moveable between an out-of-park position and a park position.
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