Sit S.p.a.

Elica S.p.a.

Maurizio Achille Abate

Giancarlo Pirovano

Massimo Giacomelli

Loris Bertoli

Alessandro Franch

Maurizio Marcantonio

Marco Croin

Manuela Lippi

Giovanni Cosi

Mauro Castello

A method for modulating a valve regulating the flow rate of gas towards a burner is presented. The valve with the associated closure member configured to operate with a predetermined characteristic curve, the flow rate delivered being proportionally related to the strength of a first current signal sent to the modulator such that the flow rate can be modulated, using the proportionality, within a range of modulation between a maximum flow rate and a minimum flow rate. To deliver controlled gas flow rates that are below the minimum flow rate, the modulator is driven with a second PWM voltage signal capable of generating a particular second PWM current signal, to move the closure member of the valve according to the second signal. First and second time intervals correspond to successive durations of high signal and low signal, respectively, the sum being equal to a period of the second signal.

Method for driving a valve for regulating the flow rate of fuel gas towards a burner, in particular for condensation boilers having high power modulation

A method is provided for monitoring and controlling combustion in a burner of a fuel gas apparatus, having a sensor with an electrode able to be supplied by a voltage generator and connected to an electronic circuit for measuring the resultant potential. The method includes acquiring and processing data from experimental conditions and a second phase of evaluating the desired combustion characteristic, under an actual operating condition of the burner. A plurality of experimental combustion conditions for the burner are preselected, applying to the burner, in each condition, a power and a further significant parameter of the combustion characteristics, under each of the experimental conditions applying an electrical voltage signal to said electrode and carrying out a sampling of the response signal, calculating, based on the sequence of sampled values, the characteristic parameters of the waveform of the signal for each of the experimental conditions.

Method for monitoring and controlling combustion in fuel gas burner apparatus, and combustion control system operating in accordance with said method

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Bologna, Italy

Maurizio Achille Abate