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US 11,441,585 B2Granted
Hydraulic system with energy recovery
AssigneeDana Motion Systems Italia S.R.L.
InventorsLuca Buscicchio, Piergiorgio Trinchieri
Life of this patent
Estimating the term…
Abstract
A hydraulic system, comprising: a hydraulic pump, a hydraulic load, and an electric machine. The electric machine working as an electric generator and mechanically coupled with said hydraulic pump. A low-pressure fluid tank and a valve assembly comprising one or more valves selectively fluidly connecting the hydraulic load with the low-pressure fluid tank.
Claims12
A hydraulic system, comprising:
- a hydraulic pump/motor;
- a hydraulic load;
- an electric machine configured to work as an electric generator and mechanically coupled with the hydraulic pump/motor;
- a low-pressure fluid tank;
- a delivery passage connecting the hydraulic pump/motor to the hydraulic load;
- a first valve positioned along a branch bypassing part of the delivery passage, the first valve connecting the hydraulic load with the hydraulic pump/motor when pressure at the hydraulic load is above a threshold pressure;
- an exit passage connecting the hydraulic load to the low-pressure fluid tank and bypassing the hydraulic pump/motor;
- and
- a second valve positioned along the exit passage, the second valve connecting the hydraulic load with the low-pressure fluid tank when the pressure at the hydraulic load is below the threshold pressure, wherein the second valve is a pilot valve.
6 more elements
A hydraulic system, comprising:
- a hydraulic pump/motor delivering fluid in a supply direction and receiving fluid in a regeneration direction;
- a hydraulic load;
- an electric machine mechanically coupled with the hydraulic pump/motor;
- a low-pressure fluid tank;
- a delivery passage connecting the hydraulic pump/motor to the hydraulic load;
- a bypass branch bypassing part of the delivery passage;
- a first valve positioned along the bypass branch, the first valve comprising an open position which flows fluid in the regeneration direction and a closed position which prevents flow, and the first valve moving to the open position when a pressure from the hydraulic load is above a pressure threshold, wherein the first valve is a sequence valve;
- an exit passage connecting the hydraulic load to the low-pressure fluid tank and bypassing the hydraulic pump/motor;
- a second valve positioned along the exit passage, the second valve opening to flow fluid to the low-pressure fluid tank when the pressure from the hydraulic load is below the pressure threshold;
- and
- a third valve preventing flow in the regeneration direction within a portion of the delivery passage.
8 more elements
A hydraulic system, comprising:
- a hydraulic pump/motor delivering fluid in a supply direction and receiving fluid in a regeneration direction;
- a hydraulic load;
- an electric machine mechanically coupled with the hydraulic pump/motor;
- a low-pressure fluid tank;
- a delivery passage connecting the hydraulic pump/motor to the hydraulic load;
- a bypass branch bypassing part of the delivery passage;
- a first valve positioned along the bypass branch, the first valve comprising an open position which flows fluid in the regeneration direction and a closed position which prevents flow, and the first valve moving to the open position when a pressure from the hydraulic load is above a pressure threshold;
- an exit passage connecting the hydraulic load to the low-pressure fluid tank and bypassing the hydraulic pump/motor;
- a second valve positioned along the exit passage, the second valve opening to flow fluid to the low-pressure fluid tank when the pressure from the hydraulic load is below the pressure threshold;
- and
- a 2-way valve which, in a first position, connects the delivery passage and the hydraulic load and, in a second position, connects the exit passage and the bypass branch to the hydraulic load.
8 more elements
Dependencies are inferred from the claim text.