Research On Vehicle Diesel Engine After-treatment Technology To Achieve State IV Emission Standard

PM and NOx are the main pollutants in diesel engines. How to reduce the composition of the two exhaust gas to the stateâ…£emission levels is difficult and research hot spots in diesel technology area today.This issue is based on the practical, further enhance the level of the engine PM emissions of the state III diesel engine, and self-study SCR after-treatment system matching. The improved after-treatment systems control strategies improves the match between the engine and the after treatment system. In order to reduce pollution emissions from vehicles, domestic manufacturers with independent intellectual property rights of the clean diesel engines, author achieves a great deal of research and development work.In this paper, the SCR technology was chosen to carry out the following specific studies:1,First of all, the topics necessary to the existing models stateâ…¢Yuchai machine structure and the emission level of research, choose the most suitable for the stateâ…£emission models.2,Engine test bench was selected to develop the performance of the engine, so that the engine of this machine to reach the stateâ…£PM emissions. Experiment includes combustion system, lubrication system, intake and exhaust system and turbocharger matching and other improvements in the design.3,On the engine which has met the PM state IV emission standard, the treatment purification technology was researched, including conversion efficiency, parts and components from outside influence and systems reliability.4,Based on the study of abroad after-treatment control technology, this paper optimized the control strategy, and test strategies to improve and perfect.5,On the engine and after-treatment matching calibration, especially in the all dynamic engine cycle calibration, the engine achieve the stateâ…£emission levels. Research on stateâ…£Engine reliability and consistency.Matching the application of vehicle volume show that the after-treatment system engine studied in this paper, has good reliability, usability, scalability, etc. After the adoption of treatment systems to improve the software and hardware to match, making post-processing system performance has significantly improved, fully able to meet the system's real-time response requirements. The research and application of the after-treatment technology has important practical significance and real value for improving domestic state IV diesel engine with electric control.