A block-connected model structure based on a static nonlinear function and a dynamic linear part was introduced to describe the dynamic characteristics of a hot-wire type mass-air-flow(MAF) sensor.The nonlinear part was expressed by polynomial fitting and the linear part was modeled with an output error(OE) model.For each calibration point when the sensor worked both in positive-step and negative-step modes,Hammerstein models were established respectively based on the calibration experiment data and validat...