Method for setting and regulating a fuel-air ratio in a heating system as well as a control unit and a heating system

摘要

The invention relates to a method (54) for setting and regulating a fuel-air ratio (56) in a heating system (46) with a sensor for detecting a combustion parameter (84), in particular an ionization current (86), which comprises the following steps : • Generating (58) a temporary, temporal fluid supply change (60) of a fluid supply parameter (62) which is provided to generate a temporal change in the combustion parameter (84), the fluid supply change (60) being selected so that the temporal change of the Combustion parameter (84) has a double peak structure (94) which has at least a first peak (88), a first dip (90) and a second peak (92), • determining (80) the first peak (88) and the second peak (92) from the temporal change in the combustion parameter (84) correlated with the temporal change in fluid supply (60), • determining (101) an oxygen concentration (103) as a function of a Qu otients from the first peak (88) and the second peak (92), • Determining (102) a first burner output parameter (104), • Determining (116) a target combustion parameter (130) based on the oxygen concentration (103) and the first burner output parameter ( 104), • regulating the heating system (46) on the basis of the nominal combustion parameter (130). The invention also relates to a control unit (18) which is designed to carry out the method (54) according to the invention, as well as a heating system (46) with the control unit ( 18).