Air flow sensor can accurately measure intake flow of engine

air flow in engine intake manifold is unsteady flow whose flow velocity changes remarkably

therefore

flow sensor should has faster dynamic response. A thermosetting coupling model of a hot-film sensor is established based on CFD which is used to simulate dynamic response characteristics

temperature field of the hot-film flow sensor probe is simulated

and in addition

dynamic response characteristics of sensor is simulated and calculated using step pulse

test dynamic response characteristics based on flow test equipment. Dynamic response speed is lower than the value of simulation

because heat balance of hot-film needs a self-regulation process.