Patent ID: 11946468
Assignee: DIINEF AS
Field: Engines, pumps, turbines (Mechanical engineering)
Classification: CPC F | IPC F

Claim 6:
7. A method for idling a hydraulic machine, wherein the hydraulic machine comprises:
at least one working chamber with cyclically varying volume;
controllable high and low-pressure valves arranged between a fluid source and the at least one working chamber and at least one fluid sink and the at least one working chamber respectively, wherein the fluid source has high pressure and the at least one fluid sink has low pressure; and
a control system arranged to control opening and closing of said high and low-pressure valves,
wherein a first idle safety valve arrangement is arranged between the at least one first working chamber and the at least one fluid sink with a pressure equal to or lower than the high pressure, and
wherein the method comprises:
operating the hydraulic machine in an empty cylinder idle mode, wherein the high and low-pressure valves are concurrently closed for at least a whole cycle of the varying volume; and
releasing hydraulic fluid to the at least one fluid sink only when fluid pressure in the at least one working chamber increases above a set threshold and the empty cylinder idle mode is enabled:
enabling the first idle safety valve arrangement when the hydraulic machine operates in the empty cylinder idle mode; and
disabling the first idle safety valve arrangement when the hydraulic machine does not operate in the empty cylinder idle mode.