Research on Oxygen Sensor Control System for Heavy-duty Natural Gas Engine
In order to improve the accuracy of the air-fuel ratio of the heavy-duty natural gas engine,based on the model control method the principal of oxygen sensor,this paper is constructed a control system model and a measurement of an adaptive air-fuel ratio.Through adaptive control and transient compensation strategy,the en-gine can realize an accurate closed-loop control of air-fuel ratio in all working condition.In the WHTC cycle e-mission test,if the accuracy ofλincreased 20%,NOx is reduced 23%,CH4 is reduced 40%.The main emission pollutants are significant reduced.The emission of the engine can achieve a higher level.
Natural-gas engineOxygen sensorClosed-loop control
NETL
NSTL
万方数据
