Fluid-working machine and method of detecting a fault
First Claim
1. A method of detecting a fault in a fluid-working machine comprising a plurality of working chambers of cyclically varying volume, each said working chamber operable to displace a volume of a working fluid which is selectable by active control of one or more electronically controllable valves for each cycle of a working chamber volume to carry out a working function responsive to a received demand signal,the method comprising determining whether a measured output parameter of the fluid working machine which is responsive to the displacement of the working fluid by one or more of the working chambers to carry out the working function fulfils at least one acceptable function criterion,the method further comprising taking into account the previously selected net displacement of the working fluid by a working chamber of said plurality of working chambers by the active control of one or more electronically controllable valves during a cycle of working chamber volume to carry out the working function.
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Accused Products
Abstract
In a method of detecting a fault in a fluid-working machine including a plurality of working chambers of cyclically varying volume, each working chamber is operable to displace a volume of working fluid which is selectable for each cycle of working chamber volume to carry out a working function responsive to a received demand signal. An output parameter of the fluid working machine, which is responsive to the displacement of working fluid by one or more of the working chambers to carry out the working function, is measured. It is determined whether the measured output parameter fulfils at least one acceptable function criterion, taking into account the previously selected net displacement of working fluid by a working chamber during a cycle of working chamber volume to carry out the working function.
58 Citations
25 Claims
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1. A method of detecting a fault in a fluid-working machine comprising a plurality of working chambers of cyclically varying volume, each said working chamber operable to displace a volume of a working fluid which is selectable by active control of one or more electronically controllable valves for each cycle of a working chamber volume to carry out a working function responsive to a received demand signal,
the method comprising determining whether a measured output parameter of the fluid working machine which is responsive to the displacement of the working fluid by one or more of the working chambers to carry out the working function fulfils at least one acceptable function criterion, the method further comprising taking into account the previously selected net displacement of the working fluid by a working chamber of said plurality of working chambers by the active control of one or more electronically controllable valves during a cycle of working chamber volume to carry out the working function.
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10. A method of detecting a fault in a fluid path in a fluid-working machine comprising a plurality of working chambers of cyclically varying volume, each said working chamber operable to displace a volume of the working fluid which is selectable by active control of one or more electronically controllable valves for each cycle of working chamber volume to carry out a working function responsive to a received demand signal, and one or more ports, one or more of which are associated with the working function, wherein the fluid-working machine is configurable to direct the working fluid along a fluid path selectable from amongst a group of different fluid paths to carry out the working function, each fluid path in the group of different fluid paths extending between one or more said ports and one or more working chambers, the method comprising detecting a fault in the fluid-working machine, wherein the detecting the fault in the fluid-working machine further comprises
determining whether a measured output parameter of the fluid working machine which is responsive to the displacement of the working fluid by one or more of the working chambers to carry out the working function fulfils at least one acceptable function criterion, and taking into account the previously selected net displacement of the working fluid by a working chamber of said plurality of working chambers by the active control of one or more electronically controllable valves during a cycle of working chamber volume to carry out the working function.
- 16. A fluid-working machine comprising a controller and a plurality of working chambers of cyclically varying volume, each said working chamber operable to displace a volume of a working fluid which is selectable by the controller on each cycle of a working chamber volume, the controller operable to select the volume of the working fluid displaced by one or more said working chambers on each cycle of working chamber volume by active control of one or more electronically controllable valves to carry out a working function responsive to a received demand signal, the fluid-working machine further comprising a fault detection module operable to determine whether a measured output parameter of the fluid working machine which is responsive to the displacement of the working fluid by one or more said working chambers to carry out the working function fulfils at least one acceptable function criterion by taking into account the previously selected net displacement of the working fluid by a working chamber by the active control of one or more electronically controllable valves during a cycle of working chamber volume to carry out the working function.
Specification