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The paper presents a comparison of selected functions used in the description of the flow characteristics of a throttlebody. The purpose of the performed analysis was to select functions that would represent the throttle flow capacity withthe smallest possible error. Such characteristics are used in the modeling of the engine op-eration and very often influencethe final effect of the mixture composition by e.g. setting a stoichiometric mixture. If, at a set throttle angle the streamof air mass is erratically defined then at the set fuel mass we shall receive an improper exhaust composition, which inmodern engine designs is decisive in terms of proper engine operation. Indeed, in a real engine, the ECU based on theoxygen sensor feedback will adjust the fuel mass, but it is far better to double check the process of mixture formationrather than correct the consequences of its improper formation.

The assessment of the usefulness of selected functions in the description of the flow characteristics of a throttle body