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CHANGZHOU FU OU VEHICLE ACCESSORIES CO.,LTD
Add:Xinbei District, Changzhou, Jiangsu Xinyu 8 Road, Xinhua Village(Chang Heng a branch)
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Implementation of the post-processing consistency State Ⅳ need to strengthen supervision
Time:2013/6/13 Reading times:600
State Ⅳ heavy diesel vehicles will soon be implemented , for the use which technology route, the majority of domestic mainstream manufacturers tend to use more post-processing techniques . So as to meet the country Ⅳ emission standard key component of post-processing system consistency for vehicle quality has an important impact . Can also say that the country Ⅳ can implement , consistent with post-processing performance of the system plays a key role in the production . So, now , what are the post-processing products also produce consistency problem?
Urea shall standardization
SCR technology is to achieve the country Ⅳ emission levels of the main program . Operation of the SCR system is: when there is found in the exhaust pipe in the nitrogen oxides , the urea tank diesel exhaust treatment liquid ejected automatically , with the nitrogen oxides in the SCR catalyst reactor redox reaction of the nitrogen pollution and steam discharge. Thus , SCR technology requires the use of urea solution on the nitrogen oxides in the exhaust gas treatment .
Therefore , the quality of the urea solution vehicle directly related to emissions. "Different manufacturers vary urea solution quality , poor quality urea solution to become the country Ⅳ emission standards hinder the smooth implementation of major ." Insiders said .
It is understood that the vehicle belongs to pure substance urea solution with chemicals, the anionic, cationic, water- insoluble, formaldehyde and biuret content requirements high , substantially 0.2% ppm ~ 0.5% ppm between . Therefore, the production of urea solution must be prepared with very advanced technology . However , the current domestic production of urea manufacturers uneven strength , product quality is difficult to unity.
"In recent years , the production of urea enterprises fragmented, no one wants to contribute his own recipe , resulting in the production of urea over the quality can not be unified , and this country is no mandatory regulatory requirements , if companies do not work together to develop standards for the implementation of the country Ⅳ will be hindered . " insiders said.
In addition , since the early implementation of the country Ⅳ standard since Beijing , Shanghai part of the SCR system bus appeared in certain conditions ( such as low-speed, low temperature ) has no effect, car urea solution crystallization problems, causing the vehicle to nitrogen oxides actual emissions seriously overweight situation. "These issues should arouse the attention -related enterprises , and thus for process improvement and development , in order to pave the way for the implementation of the country Ⅳ ." In a post-processing company official said .
Lack of policy support OBD monitoring
"In order to achieve the country Ⅳ emission standards, mostly heavy vehicles need to install after-treatment systems , however , the system is most difficult to OBD monitoring, that is, in the absence of urea in the case , how to control the operation of the vehicle ." Anhui Ai Blue energy environmental Protection Technology Co., Ltd. can be technical director Zhu Qing told the " commercial Vehicle News " reporter, in Europe , the implementation of the main method is to limit the torque and alarm monitoring . Once the post-processing system is missing urea solution , OBD alarm device will be the first time to release an alarm if the driver ignored , the vehicle will stop within 50 to 60 km run .
However, Zhu Qing said that so far , China has not issued the relevant policies , this is likely to lead to post-processing enterprises launched fake , shoddy products , thereby affecting product consistency.
" In addition, because SCR is an open path system and no ammonia leak , particulate matter emissions monitoring, therefore , the real sense, the system does not do negative feedback , which requires two additional nitrogen oxide sensors monitoring , however taking into account China 's national conditions, the sensor will increase the cost increases, so that the current domestic post-processing systems are generally only a nitrogen oxide sensor , it can not be quantified on the ammonia leak at this point, but also the national regulatory not very strict . " Zhu Qing said.
For product consistency , ZHU also talked about the system's core technology . "SCR system consists of the urea SCR catalyst and the reducing agent supply means two electrical control parts , however , the current electric supply means , the domestic self-developed and mass production companies also few, most companies make only stay in the sample phase, the market or by the electronic control unit Bosch and other foreign companies a monopoly . " Therefore , ZHU worry , domestic enterprises will be the core components of the cost is too high because of the use of poor quality products . "Domestic companies are doing post-processing experiments and is typically used when a public announcement on the core equipment abroad , but mass production, because foreign companies can not supply or the price is too high for reasons such as switched to using domestic equipment , the quality of it is inevitable there will be some discount . " Zhu Qing said.
Therefore, he believes , the product must be made by the national regulatory production consistency and establish a complete quality management system, focus on the production site quality control . "In the past , the state annually and corporate checks 1 or 2 times , but checks only cover 40% of the enterprise, that is , 60% of enterprises do not have to be checked , so after the implementation of the country Ⅳ , the state should increase sampling frequency and intensity of such conformity of production will gradually increase . " Zhu Qing said.
In addition , a company official said , conformity of production at the factory not only detect whether the target is more important is that in the process of using real-time detection , which aspects of the problem , it is the burden of responsibility by the respective manufacturers .
" Preparation phase is a continuous learning process , the only way to make the product better and better consistency , if the enterprise does not always seek a breakthrough , product consistency can only be empty talk ." The official said .
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