DEVICE, METHOD AND SYSTEM FOR DETERMINING GAS APPLIANCE, AND DEVICE AND METHOD FOR MONITORING GAS FLOW CHANNEL

摘要

PROBLEM TO BE SOLVED: To provide a device and method for determining a gas appliance capable of easily and accurately specifying the type of a gas appliance and detecting gas leak at low cost. SOLUTION: When measuring signals i(t) and v(t) of gas flow rate and gas pressure are provided at a certain period to respective differentiating/integrating means 13 and 14 from a gas flow rate measuring section 11 and a gas pressure measuring section 12 disposed in a gas flow channel, the differentiating/integrating means 13 and 14 derive a differentiated value and integrated value for a circuit model, and provide them to an output resistance estimating means 15. The output resistance estimating means 15 calculates an output resistance estimated value from the differentiated value and integrated value, using the circuit model where an electric circuit is substituted for the gas flowing through the gas flow channel and an estimation expression for output resistance estimation preset for this circuit model. An appliance determining means 16 receives the estimated value of the output resistance from the output resistance estimating means 15, and determines the type of the gas appliance and existence of gas leak based on a variation pattern on the time axis of the inverse. COPYRIGHT: (C)2008,JPO&INPIT