System and method for sensor control of the fuel-air ratio...

F - Mech Eng,Light,Heat,Weapons – 02 – G

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Details

F02G 1/043 (2006.01) F02G 1/047 (2006.01) F02G 1/055 (2006.01) F23D 14/60 (2006.01) F23N 1/02 (2006.01) F23N 3/08 (2006.01) F23N 5/00 (2006.01)

Patent

CA 2446855

A method for controlling the fuel-air ratio of a burner having a blower responsive to a blower drive signal for injecting air into the burner. The method is based at least on the concentration of a gas in an exhaust gas product of a combustion chamber of the burner and includes measuring the gas concentration in the exhaust gas product, deriving a gas concentration signal from the measured gas concentration, determining the fuel-air ratio from the gas concentration signal and the sign of the derivative of the gas concentration signal with respect to the blower drive signal, and controlling the fuel-air ratio by adjusting the air flow rate into the burner. The burner may be, for example, in a Stirling cycle engine.

La présente invention concerne un procédé pour commander le rapport carburant-air dans un brûleur qui présente une soufflante sensible à un signal de commande de soufflante permettant d'injecter de l'air dans le brûleur. Ce procédé est basé au moins sur la concentration d'un gaz dans un produit de gaz d'échappement issu d'une chambre de combustion du brûleur et consiste à mesurer la concentration en gaz dans ledit produit de gaz d'échappement, à dériver un signal de concentration en gaz à partir de la concentration en gaz mesurée, à déterminer le rapport carburant-air à partir du signal de concentration en gaz et le signe de la dérivée du signal de concentration en gaz par rapport au signal de commande de soufflante, puis à commander le rapport carburant-air par réglage du débit d'air dans le brûleur. Le brûleur selon cette invention peut par exemple être un moteur Stirling.

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