In order to guarantee gasoline engine in the automobile to obtain the best density the mixture air request under the revolution case

damper primary device is used

an intelligent measurement model of air flow from intake manifold in the gasoline engine of automobile is established by using air admission branch pipe

fitting rotation degrees by function chain neural network and fitting damper efflux coefficient based on the principle of differential pressure type throttle flow measurement.The experiment results show that the errors of intelligent measurement model will reduce with pressure ascension of air intake manifold and its error is smaller than 5.0 %.