Hydraulic control system
AssigneeGM Global Technology Operations LLC
InventorsVijay A. Neelakantan, Ajit Singh Grewal
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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.
Claims17
A fluid control system for a motor vehicle transmission comprising, in combination,
- a pump having a fluid output and an electric motor driving said pump, said electric motor having a stator,
- a solenoid valve communicating with said fluid output and providing a variable pressure output,
- a pressure regulator valve having a control port communicating with said variable pressure output and an input port communicating with said fluid output,
- a stator shift valve having a control port communicating with said variable pressure output, a first input port communicating with said fluid output and a first outlet port communicating with said stator of said electric motor,
- a transmission fluid cooler having an inlet communicating with an outlet port of said pressure regulator valve and an outlet communicating with a second inlet port of said stator shift valve, and
- a clutch having a fluid operator communicating with a second outlet port of said stator shift valve.
A hydraulic control system for a motor vehicle automatic transmission comprising, in combination,
- a hydraulic pump having a hydraulic fluid output and an electric motor driving said hydraulic pump, said electric motor having a stator,
- a variable force solenoid valve communicating with said hydraulic fluid output of said pump and providing a variable pressure fluid signal,
- a pressure regulator valve having a control port communicating with said variable pressure fluid signal and an input port communicating with said hydraulic fluid output,
- a stator shift valve having a control port communicating with said variable pressure fluid signal, a first input port communicating with said hydraulic fluid output and a first outlet port communicating with said stator of said electric motor,
- a transmission fluid cooler having an inlet communicating with an outlet port of said pressure regulator valve and an outlet communicating with a second inlet port of said stator shift valve, and
- a clutch having a hydraulic operator in fluid communication with a second outlet port of said stator shift valve.
A hydraulic control system for a motor vehicle automatic transmission comprising, in combination,
- a hydraulic pump having a hydraulic fluid output and an electric motor driving said hydraulic pump, said electric motor having a stator,
- a variable force solenoid valve communicating with said hydraulic fluid output of said pump and providing a variable pressure fluid signal,
- a pressure regulator valve having a control port communicating with said variable pressure fluid signal and an input port communicating with said hydraulic fluid output,
- a stator shift valve having a control port communicating with said variable pressure fluid signal, a first input port communicating with said hydraulic fluid output and a first outlet port communicating with said stator of said electric motor,
- a transmission fluid cooler having an inlet communicating with an outlet port of said pressure regulator valve and an outlet communicating with a second inlet port of said stator shift valve, and
- a clutch having a hydraulic operator in fluid communication with a second outlet port of said stator shift valve,
- wherein said stator shift valve selectively supplies hydraulic fluid to one of said stator of said electric motor and said hydraulic operator of said clutch.
Dependencies are inferred from the claim text.