# US 2014/0360255 A1 · Monitoring the fuel supply cutoff valve for an engine > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2014/0360255 A1 - Document ID: US20140360255A1 - Status: Published application - Kind: A1 - Application number: 14/299,392 - Filed: 2014-06-09 - Published: 2014-12-11 - Earliest claimed: 2013-06-10 - Assignees: Snecma - Applicants: Snecma - Inventors: Christophe JAVELOT; Mohamed BOUTALEB; Cedrik DJELASSI; Victor HENRY - Web page: https://patentgrep.com/patent/US20140360255A1 ## CPC - G01M 15/042: {by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12} - F01D 21/20: Checking operation of shut-down devices - F02C 7/232: Fuel valves {(control of fuel supply by means of fuel metering valves F02C9/263)}; Draining valves or systems (valves in general F16K) - F02C 9/46: Emergency fuel control - F05D 2260/83: Testing, e.g. methods, components or tools therefor - Y02T 50/60: Efficient propulsion technologies, e.g. for aircraft - G01M: TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR - F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D) - F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00) - F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract Method of testing an engine fuel supply cutoff valve, characterised in that it comprises steps to: detect (E1) a fuel supply cutoff command, command (E3) to close the fuel supply cutoff valve, command (E4) to hold the fuel metering valve in the open position for a predetermined time, command (E5) to close the fuel metering valve after the predetermined time, measure (E6) an engine operating parameter during performance of the previous steps, compare (E7) the measured parameter with a predetermined threshold, so as to determine whether or not the engine operating parameter corresponds to an engine fuel supply cutoff by normal operation of the fuel supply cutoff valve. ## Claims ### Claim 1 A method of testing a fuel supply cutoff valve for an engine, said method comprising: detecting a fuel supply cutoff command, commanding to close the fuel supply cutoff valve, commanding to hold the fuel metering valve in the open position for a predetermined time, commanding to close the fuel metering valve after the predetermined time, measuring an engine operating parameter during performance of the previous steps, comparing the measured parameter with a predetermined threshold, so as to determine whether or not the engine operating parameter corresponds to an engine fuel supply cutoff by normal operation of the fuel supply cutoff valve. ### Claim 2 (depends on 1) A testing method according to claim 1, wherein the engine operating parameter is an engine speed gradient. ### Claim 3 (depends on 1) The testing method according to claim 1, wherein the engine operating parameter is a pressure gradient. ### Claim 4 (depends on 1) The testing method according to claim 1, wherein the test method also includes a preliminary step of checking that safety conditions are satisfied. ### Claim 5 (depends on 4) The testing method according to claim 4, wherein the engine is an aircraft engine, and said safety conditions include detection that the aircraft is on the ground. ### Claim 6 (depends on 1) The testing method according to claim 1, wherein the test method also includes a preliminary step of checking that validity conditions are satisfied. ### Claim 7 (depends on 6) The testing method according to claim 6, wherein the validity conditions include verification that the engine speed is above a predetermined threshold. ### Claim 8 A device to test an engine fuel supply cutoff valve, comprising: means of detecting a fuel supply cutoff command, means of giving a command to close the fuel supply cutoff valve, means of giving a command to hold the fuel metering valve in the open position for a predetermined time, means of giving a command to close the fuel metering valve after the predetermined time, means of measuring an engine operating parameter during performance of the previous steps, means of comparing the measured parameter with a predetermined threshold so as to determine whether or not the engine operating parameter corresponds to an engine fuel supply cutoff due to normal operation of the fuel supply cutoff valve. ### Claim 9 (depends on 1) A computer program containing instructions suitable for performance of the steps in a method according to claim 1 when said program is run by a computer. ### Claim 10 (depends on 1) A computer readable recording medium on which a computer program that includes instructions for performing the steps in the method is recorded according to claim 1.