Electronic transmission range selection subsystem in a hydraulic control system for an automatic transmission
AssigneeGM Global Technology Operations LLC
InventorsVijay A. Neelakantan, Joshua McDonough, Philip C. Lundberg
Life of this patent
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Abstract
A hydraulic control system for a transmission is provided. The hydraulic control system includes a source of pressurized hydraulic fluid that communicates with an electronic transmission range selection (ETRS) subsystem. In one example, the ETRS subsystem includes an ETRS enablement valve, an ETRS control valve, a park servo that controls a park mechanism, a plurality of solenoids, and a park inhibit solenoid assembly.
Claims20
A hydraulic control system for a transmission in a motor vehicle, the hydraulic control system comprising:
- a pressure regulator subsystem for providing a pressurized hydraulic fluid;
- an enablement valve assembly connected directly downstream of the pressure regulator subsystem and configured to selectively allow pressurized hydraulic fluid to communicate through the enablement valve assembly;
- a control valve assembly connected directly downstream of the enablement valve assembly and configured to selectively communicate the pressurized hydraulic fluid to one of a first port and a second port;
- a park servo assembly connected directly downstream to the first port and the second port of the control valve assembly and configured to control a park mechanism a fourth port;
- a first solenoid configured to control the enablement valve assembly;
- and
- a second solenoid configured to control the control valve assembly.
A hydraulic control system in a transmission of a motor vehicle, the hydraulic control system comprising:
- a pressure regulator subsystem for providing a pressurized hydraulic fluid;
- an enablement valve assembly having an inlet in communication with the pressure regulator subsystem, an outlet, a signal port, and an enablement valve moveable between a first position and a second position, wherein the enablement valve prohibits fluid communication from the inlet to the outlet when in the first position and allows fluid communication from the inlet to the outlet when in the second position;
- a control valve assembly having a first port directly hydraulically connected downstream to the outlet of the enablement valve assembly, a second port, a third port, a fourth port, a first valve, and a second valve, wherein the first valve is moveable between a first position and a second position and the first valve allows fluid communication between the first port and the third port when in the first position and the first valve allows fluid communication between the first port and the second port when in the second position, and wherein the fourth port communicates with an end of the second valve;
- a park servo assembly directly hydraulically connected downstream to the second and third ports of the control valve assembly, the park servo assembly configured to control a park mechanism;
- a first solenoid connected directly upstream to the signal port of the enablement valve assembly;
- and
- a second solenoid connected directly upstream to the fourth port of the control valve assembly.
Dependencies are inferred from the claim text.