Numerical analysis and design for NOx sensor pump units decoupling control

NOx sensors capable of accurately and quickly detecting oxygen concentration and achieving air-fuel ratio and nitrogen oxide concentration measurement play a key role in controlling exhaust emissions. Due to the coupling relationship between the chambers and the large thermal shock environment, the NOx sensor is difficult to achieve high-precision and rapid measurement under complex conditions. In order to solve this problem, this paper proposes a cascade fuzzy feedforward control algorithm for nitrogenoxygen sensors. On the one hand, the algorithm uses cascade control to complete the control of the main atmosphere influence unit. On the other hand, it is based on the fuzzy control of deviation, and does not need to establish an accurate mathematical model for the controlled object. The analysis shows that the design of the nitrogen-oxygen sensor control system proposed in this paper is feasible, and its response speed is fast and has good control effect.