Invention Grant
- Patent Title: Hydraulic control system
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Application No.: US15056732Application Date: 2016-02-29
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Publication No.: US09856931B2Publication Date: 2018-01-02
- Inventor: Vijay A. Neelakantan , Ajit Singh Grewal
- 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: F16D48/02
- IPC: F16D48/02 ; F16D25/08 ; F16D11/14 ; F16D25/12

Abstract:
A hydraulic control system includes a hydraulic pump driven by an electric motor, a solenoid valve having an output that controls the positions of a pressure regulator valve and a third, stator shift valve. The solenoid valve is a normally high, variable force solenoid valve which provides a control signal to the second and third valves. The second, pressure regulator valve is a multiple port valve which controls hydraulic fluid flow both to a transmission oil cooler (ATOC) and to an exhaust port, thereby maintaining a desired system pressure. The third, stator shift valve is also a multiple port valve and it controls fluid flow to the stator of the electric pump motor to provide cooling and to a dog clutch of the transmission to disengage it.
Public/Granted literature
- US20170248178A1 HYDRAULIC CONTROL SYSTEM Public/Granted day:2017-08-31
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