Deducing pressure from reopening angle
AssigneeArtemis Intelligent Power Limited
InventorsMark BRETT, Peter MCCURRY
Life of this patent
Estimating the term…
Abstract
A measurement of the pressure of hydraulic fluid in a fluid working machine can be determined from the timing of the movement of valves which selectively seal a working chamber of cyclically varying volume from a fluid gallery. The timing of opening of a low pressure valve, to connect a working chamber to a low pressure fluid gallery, following the closure of a high pressure valve to seal a working chamber can be used to estimate the pressure in the high pressure fluid gallery at the moment of closure of the high pressure valve.
Claims18
A method of estimating the pressure of hydraulic fluid in a fluid working machine, the fluid working machine comprising a working chamber of cyclically varying volume, first and second hydraulic fluid galleries, a first valve which regulates the flow of hydraulic fluid between the working chamber and the first fluid gallery and a second valve which regulates the flow of hydraulic fluid between the working chamber and the second fluid gallery, the method comprising detecting an event indicative of the opening or closing of the first valve to bring the working chamber into or out of fluid communication with the first fluid gallery and estimating the said pressure from the timing of the said detected event.
A fluid working machine comprising a working chamber of cyclically varying volume, first and second hydraulic fluid galleries, a first valve which regulates the flow of hydraulic fluid between the working chamber and the first fluid gallery and a second valve which regulates the flow of hydraulic fluid between the working chamber and the second fluid gallery, and a controller, the controller configured to estimate a pressure of working fluid in the fluid working machine by detecting and measuring the timing of an event indicative of the opening or closing of the first valve to bring the working chamber into or out of fluid communication with the first fluid gallery and processing the timing of the said detected event to estimate the pressure.
Dependencies are inferred from the claim text.