Abstract：To match the heavy diesel engine with selective catalytic reduction (SCR) postprocessing system， the SCR postprocessing system controller was developed. SCR controller hardware was designed based on advanced chip MC9S12XEQ512 to realize performance test. The control strategy of SCR system was investigated in detail. Using the downstream NOx concentration and exhaust gas mass flow measured by NOx sensor and flowmeter as expected output, the raw NOx emission model was established with a teacher of BP neural networks for target diesel engine. Based on the BP model AdBlue dosing control strategy under steady state conditions, the heat hysteresis correction algorithm of catalyst substrate and the NH3 leak control strategy were proposed under transient operation conditions. The test results show that the proposed SCR control strategy has good robustness under transient conditions with NOx conversion ratio of 60% and maximal NH3 leak quantity less than 2.5×10-5. Using the proposed controller in target engine, the ESC and ETC test validation shows that the heavy duty diesel engine can satisfy China-Ⅳemission regulations.
刘传宝, 颜伏伍. 柴油机SCR后处理控制器的研发[J]. 江苏大学学报（自然科学版）, 2014, 35(1): 7-13.
LIU Chuan-Bao, YAN Fu-Wu. Development of SCR post-processing controller of diesel engine[J]. Journal of Jiangsu University(Natural Science Eidtion)
, 2014, 35(1): 7-13.
2014, Vol. 35 
