Xiagong Chusheng Wrecker Factory is the largest wrecker production base in China after Guangdong Guangdong Province. It has surpassed Guangdong Guangdong in the production of wrecker production facilities, and it is almost the same in the production process, hydraulic parts purchase, etc. Currently, XCMG's Chu Sheng Wrecker is investing heavily in scientific research. It has developed in the field of major-level wreckers and multi-purpose wreckers. The drag-lifting multi-purpose wrecker has long been available, 60 tons in succession, and super The large semi-trailer will also be successfully developed by the end of 2013.
With the full implementation of the National IV emission standards, many areas in the country’s three models will not be able to get households, resulting in the gradual increase of the National IV vehicles. In order to better serve the road rescue industry, the National IV road wrecker will also be put into mass production. Compared with the "National Sanqing Wrecker Standard", the "National IV Wrecker Standard" has stricter control over the emission of motor vehicles, and it needs to be further reduced by 30% to 50% on the basis of meeting the "National III Wrecker Standard". The pollutants can reach the standard. The ultimate goal of the implementation of the Euro IV wrecker standard is to reduce the emission of pollutants.
For high-power wrecker diesel engines: There are basically two routes
1 Lower NOx through EGR, then reduce PM to Euro 4 level through post-processing techniques such as particle traps or particle oxidizers;
2 By optimizing the combustion system (mainly using high-pressure injection + reasonable combustion organization) to reduce the particles, but at the same time allow the NOx to rise, and then, in the exhaust after-treatment system, the NOx is reduced to Euro 4 level through the SCR catalyst. But in China today, use
Both DPF and SCR have many objective constraints, such as oil infrastructure issues.
For small power wrecker diesel engines:
More realistic technical solutions are: direct injection + supercharged intercooled + cooled EGR + oxidation catalyst + electronically controlled fuel injection system (preferably common rail)
The above is the working principle of the S4 Wrecker engine, and technical issues will be improved in the follow-up work.
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