US 8,020,379 B2 · Double redundancy electro hydrostatic actuator system

Abstract

A double redundancy electro hydrostatic actuator system includes two hydraulic pumps; two fail safe valves connected with the two hydraulic pumps, respectively; one dual tandem hydraulic cylinder connected with the two fail safe valves and having a piston rod, wherein the piston rod is moved by switching supply and discharge of the fluid; two switching valves connected with the two fail safe valves; two accumulators connected with the two switching valves and the two hydraulic pumps, respectively; and two chambers connected with the two switching valves, respectively. Each of the two accumulators accumulates the fluid from a corresponding one of the two hydraulic pumps, and sends the fluid to a corresponding one of the two fail safe valves. The two chambers receive the fluid from the two fail safe valves, respectively.

Claims8

Dependent claims

A double redundancy electro hydrostatic actuator system comprising:

two hydraulic pumps;
two fail safe valves connected with said two hydraulic pumps, respectively;
one dual tandem hydraulic cylinder connected with said two fail safe valves and having a piston rod, wherein said piston rod is moved by switching supply and discharge of fluid;
two switching valves connected with said two fail safe valves;
two accumulators connected with said two switching valves and said two hydraulic pumps, respectively;
and
two chambers connected with said two switching valves, respectively,
wherein each of said two accumulators accumulates the fluid from a corresponding one of said two hydraulic pumps, and sends the fluid to a corresponding one of said two fail safe valves, and
said two chambers receive the fluid from said two fail safe valves, respectively.

6 more elements

A method of controlling an electro hydrostatic actuator system, comprising:

generating fluid of a predetermined pressure by two hydraulic pumps, respectively;
accumulating fluids from the two hydraulic pumps by two accumulators, respectively;
controlling two switching valves to transfer the hydraulic pressures from said two accumulators to two fail safe valves, respectively;
controlling the two fail safe valves to transfer the hydraulic pressures from the two switching valves to a duel tandem hydraulic cylinder;
and
driving a piston rod of the hydraulic cylinder based on the hydraulic pressures.

3 more elements

Dependencies are inferred from the claim text.

Double redundancy electro hydrostatic actuator system

Life of this patent

Double redundancy electro hydrostatic actuator system

Life of this patent

Abstract

Claims8