System and method for actuating and controlling a transfer case
AssigneeDelphi Technologies, Inc.
InventorsSchuyler S. Shaw, John B. Hageman
Life of this patent
Estimating the term…
Abstract
One aspect of the control system provides a hydraulic control system for a transfer case that includes an actuator for generating fluid pressure. The system also includes an isolation valve and a control valve in fluid communication with the actuator. The isolation valve is in a normally closed position and the control valve is in a normally open position. The system further includes a piston for applying fluid pressure to a device of the transfer case. Another aspect provides a method for controlling the hydraulic pressure to a transfer case.
Claims19
A hydraulic control system for a transfer case comprising:
- an actuator for generating fluid pressure;
- a clutch pack;
- an isolation valve in fluid communication with the actuator via an outlet fluid line and the clutch pack, wherein the isolation valve is normally in a closed position;
- a control valve in fluid communication with the actuator via an inlet fluid line and the clutch pack, wherein the control valve is normally in an open position;
- and
- a first piston for applying fluid pressure to the clutch pack, the first piston positioned in fluid communication between the isolation valve and the control valve.
A hydraulic control system for a transfer case comprising:
- an actuator for generating fluid pressure;
- a first piston for applying fluid pressure to a first device, the piston in fluid communication with the actuator via a first fluid line;
- a selector piston for applying fluid pressure to a second device, the selector piston in fluid communication with the actuator;
- and
- a shuttle valve positioned between the actuator and the selector piston,
- wherein the shuttle valve is in fluid communication with the actuator via a first and a second selector fluid line and is in fluid communication with the selector piston via a second and a third fluid line.
A method of generating hydraulic pressure for a transfer case comprising:
- generating fluid pressure;
- applying the fluid pressure to an at least one piston positioned between an isolation valve and a control valve;
- and
- controlling the fluid pressure to the at least one piston.
A hydraulic control system for a transfer case comprising:
- means for generating fluid pressure;
- means for isolating an at least one device flow the pressurized fluid;
- means for applying fluid pressure to the at least one device;
- means for controlling the pressurized fluid;
- and
- means for sensing fluid pressure,
- wherein the at least one device is positioned between the means for isolating an at least one device and the means for controlling the pressurized fluid.
Dependencies are inferred from the claim text.