A hydraulic system for aircraft wherein at least one circuit includes two hydraulic pumps, at least one of which is driven by an engine that may suffer uncontained failure that can damage hydraulic lines close to the pump, is equipped with pressure sensors for the hydraulic fluid in the lines close
A hydraulic system for aircraft wherein at least one circuit includes two hydraulic pumps, at least one of which is driven by an engine that may suffer uncontained failure that can damage hydraulic lines close to the pump, is equipped with pressure sensors for the hydraulic fluid in the lines close to the pump and a sensor for the hydraulic fluid level in a hydraulic tank of the circuit supplied by the pump. A control system for a cut-out valve installed on a suction line wherein the fluid arrives at the pump includes logic that determines the occurrence of an uncontained engine failure requiring the isolation of the pumps from line elements that may have been damaged from measurements of the fluid pressures in the lines, from measurement of the level of fluid in the tank and from information supplied late by a uncontained engine failure detection system to command the closure of the cut-out valve. The disclosed embodiments allow achieving a simplified hydraulic architecture wherein two independent circuits are supplied by two pumps each mounted on propulsion engines.
대표청구항▼
1. An aircraft hydraulic system comprising: two independent hydraulic circuits, with each of said circuits being supplied by at least two pumps respectively, wherein each of said pumps associated with a same one of said circuits is driven by a different propulsion engine, and further wherein one of
1. An aircraft hydraulic system comprising: two independent hydraulic circuits, with each of said circuits being supplied by at least two pumps respectively, wherein each of said pumps associated with a same one of said circuits is driven by a different propulsion engine, and further wherein one of said two independent hydraulic circuits supplies hydraulic power to a set of consuming units, and the other of said two independent hydraulic circuit supplies hydraulic power to the same set of consuming units;wherein for each of said independent circuits: at least one pump, amongst said at least two pumps, is driven by one of the propulsion engines that may suffer an uncontained engine failure, which uncontained engine failure may project debris into a projection area;connecting lines from the at least one pump to the rest of the at least one hydraulic circuit are installed in part in the projection area, said lines comprising: at least one low pressure hydraulic fluid suction line in which the hydraulic fluid flows from a hydraulic tank towards the at least one pump, said at least one suction line comprising a cut-out valve which in the open position lets the fluid circulate in said suction line and in the closed position prevents the fluid from circulating in said suction line;at least one high pressure hydraulic fluid discharge line, referred to as HP discharge line, in which the hydraulic fluid flows from the pump towards the rest of the hydraulic circuit, said at least one HP discharge line comprising a check valve installed to prevent hydraulic fluid from circulating in said HP discharge line towards the pump;and further wherein the at least one suction line and the at least one HP discharge line each comprise at least one pressure sensor respectively, able to deliver a signal characteristic of a hydraulic fluid pressure value in the line under consideration between the pump and the cut-out valve, respectively between the pump and the check valve, and wherein the hydraulic circuit comprises a control system for the cut-out valve that: receives from the at least one pressure sensor in each line, suction line and HP discharge line, the distinctive measured pressure signal;compares each distinctive measured pressure signal to a threshold predefined for each line;issues a close cut-out valve command signal to close the cut-out valve when at least one of the distinctive measured pressure signals is below the threshold to which it has been compared. 2. The hydraulic system according to claim 1 wherein the connection lines from the pump to the rest of the hydraulic circuit, installed in part in the projection area, comprise at least one low pressure hydraulic fluid drain line in which hydraulic fluid flows from a pump sump towards the tank, said drain line comprising a check valve installed to stop hydraulic fluid flowing in said drain line from the tank to the pump sump and comprising at least one pressure sensor able to deliver a distinctive hydraulic pressure value signal in the line under consideration between the pump and the check valve, and wherein the cut-out valve control system receives the distinctive drain line fluid pressure signal and issues the cut-out valve close command when said measured pressure is below a threshold. 3. The hydraulic system according to claim 1 wherein the cut-out valve control system inhibits the cut-out valve close command when the pressure as measured on the suction line is below the predefined threshold for said suction line if a signal distinctive of a hydraulic fluid level in the tank does not indicate that said fluid level in the tank is below a predefined minimum level, referred to as tank low level. 4. The hydraulic system according to claim 3 wherein the cut-out valve control system: issues a cut-out valve close signal when none of the pressures in the suction line, the HP discharge line and where applicable drain lines are measured as below the predefined thresholds but when a tank low level signal has been received and;a signal identifying an uncontained engine failure has been received from an uncontained engine failure detection system. 5. The hydraulic system according to claim 4 wherein the cut-out valve close command is locked in the valve closed condition when the tank low hydraulic fluid level is received and an uncontained engine failure signal is received from the uncontained engine failure detection system. 6. The hydraulic system according to claim 3 wherein the pressure in a line is determined by means of two pressure sensors, respectively, and in which the pressure in a given line is considered to be below the threshold defined for said line if: at least one of the two sensors associated with said line delivers a signal distinctive of a pressure being below its corresponding threshold;validity signals for the measurements supplied by the two sensors indicate that neither of the two sensors is able to transmit a reliable measurement. 7. The hydraulic system according to claim 3 wherein the low hydraulic fluid level in the tank is consolidated: by comparing a fluid in tank level value QB, measured by a level sensor, with a threshold value SQB and by combining the result of this comparison with a QMIN signal from a minimum level sensor in the tank using a logical AND when the value transmitted by the level sensor is deemed reliable because of the value of a validity signal associated with said level sensor, or;by using only the QMIN signal from the minimum level sensor when the value sent by the level sensor is deemed not reliable because of the value of a validity signal associated with said level sensor. 8. The hydraulic system according to claim 6 wherein the cut-out valve control system inhibits the cut-out valve or valves close signal, if said cut-out valve or valves were not closed because of a supposed or confirmed uncontained engine failure, when the aircraft is not in flight and/or a pump has been depressurized by a deliberate COP depressurization command. 9. The hydraulic system according to claim 8 wherein the cut-out valve control system is able to issue a cut-out valve open signal and only authorizes generation of said open signal, when the conditions for closing cut-out valve were satisfied in flight, when all the aircraft's engines are detected as stopped, the aircraft is detected as being on the ground and the hydraulic fluid level in the tank is above the low level. 10. An aircraft hydraulic system comprising at least one hydraulic circuit supplied by at least two pumps respectively, wherein: at least one pump amongst said at least two pumps is driven by an engine that may suffer an uncontained engine failure, which uncontained engine failure may project debris into a projection area;connecting lines from the at least one pump to the rest of the at least one hydraulic circuit area installed in part in the projection area, said lines comprising: at least one low pressure hydraulic fluid suction line in which the hydraulic fluid flows from a hydraulic tank towards the at least one pump, said at least one suction line comprising a cut-out valve which in the open position lets the fluid circulate in said suction line and in the closed position prevents the fluid from circulating in said suction line;at least one high pressure hydraulic fluid discharge line, referred to as HP discharge line, in which the hydraulic fluid flows from the pump towards the rest of the hydraulic circuit, said at least one HP discharge line comprising a check valve installed to prevent hydraulic fluid from circulating in said HP discharge line towards the pump;wherein the at least one suction line and the at least one HP discharge line each comprise at least one pressure sensor respectively, able to deliver a signal characteristic of a hydraulic fluid pressure value in the line under consideration between the pump and the cut-out valve, respectively between the pump and the check valve, and wherein the hydraulic circuit comprises a control system for the cut-out valve that: receives from the at least one pressure sensor in each line, suction line and HP discharge line, the distinctive measured pressure signal;compares each distinctive measured pressure signal to a threshold predefined for each line;issues a close cut-out valve command signal to close the cut-out valve when at least one of the distinctive measured pressure signals is below the threshold to which it has been compared; andwherein the cut-out valve control system inhibits the cut-out valve close command when the pressure as measured on the suction line is below the predefined threshold for said suction line if a signal distinctive of a hydraulic fluid level in the tank does not indicate that said fluid level in the tank is below a predefined minimum level, referred to as tank low level. 11. The hydraulic system according to claim 10 wherein the connection lines from the pump to the rest of the hydraulic circuit, installed in part in the projection area, comprise at least one low pressure hydraulic fluid drain line in which hydraulic fluid flows from a pump sump towards the tank, said drain line comprising a check valve installed to stop hydraulic fluid flowing in said drain line from the tank to the pump sump and comprising at least one pressure sensor able to deliver a distinctive hydraulic pressure value signal in the line under consideration between the pump and the check valve, and wherein the cut-out valve control system receives the distinctive drain line fluid pressure signal and issues the cut-out valve close command when said measured pressure is below a threshold. 12. The hydraulic system according to claim 10 wherein the cut-out valve control system: issues a cut-out valve close signal when none of the pressures in the suction line, the HP discharge line and where applicable drain lines are measured as below the predefined thresholds but when a tank low level signal has been received and;a signal identifying an uncontained engine failure has been received from an uncontained engine failure detection system. 13. The hydraulic system according to claim 12 wherein the cut-out valve close command is locked in the valve closed condition when the tank low hydraulic fluid level is received and an uncontained engine failure signal is received from the uncontained engine failure detection system. 14. The hydraulic system according to claim 10 wherein the pressure in a line is determined by means of two pressure sensors, respectively, and in which the pressure in a given line is considered to be below the threshold defined for said line if: at least one of the two sensors associated with said line delivers a signal distinctive of a pressure being below its corresponding threshold;validity signals for the measurements supplied by the two sensors indicate that neither of the two sensors is able to transmit a reliable measurement. 15. The hydraulic system according to claim 14 wherein the cut-out valve control system inhibits the cut-out valve or valves close signal, if said cut-out valve or valves were not closed because of a supposed or confirmed uncontained engine failure, when the aircraft is not in flight and/or a pump has been depressurized by a deliberate COP depressurization command. 16. The hydraulic system according to claim 10 wherein the low hydraulic fluid level in the tank is consolidated: by comparing a fluid in tank level value QB, measured by a level sensor, with a threshold value SQB and by combining the result of this comparison with a QMIN signal from a minimum level sensor in the tank using a logical AND when the value transmitted by the level sensor is deemed reliable because of the value of a validity signal associated with said level sensor, or;by using only the QMIN signal from the minimum level sensor when the value sent by the level sensor is deemed not reliable because of the value of a validity signal associated with said level sensor. 17. The hydraulic system according to claim 15 wherein the cut-out valve control system is able to issue a cut-out valve open signal and only authorizes generation of said open signal, when the conditions for closing cut-out valve were satisfied in flight, when all the aircraft's engines are detected as stopped, the aircraft is detected as being on the ground and the hydraulic fluid level in the tank is above the low level.
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이 특허에 인용된 특허 (7)
Huling Don W., Airacraft hydraulic system for improved reliability of integrated hydraulic propulsion controls.
Ezell Larry O. (Clinton MS) Schmid John (Jackson MS) Tovey Peter (Jackson MS), Failsafe electrohydraulic control system for variable displacement pump.
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