A few days ago, it was learned from China National Heavy Duty Truck Corporation that the heavy-duty vehicle IV emission standard above 3.5 tons will be fully implemented as early as 2012 and will be implemented in 2013 at the latest. This news was confirmed by the relevant person from the Ministry of Environmental Protection.
At the end of 2009, the heavy-duty vehicle emission standard IV that was originally scheduled to be implemented on January 1, 2010 was delayed in the form of an undisclosed notification document. Afterwards, the topic of when China IV was implemented was always the focus of attention in the industry. In November 2010, China Aircraft Technical Service Center opened the registration of the National IV heavy-duty engine family declaration system. This incident was interpreted by many people as the next year's national IV emission standards will be implemented.
However, in early December 2010, according to the latest reports, the National IV emission standards will not be implemented until 2012 at the earliest. The Ministry of Environmental Protection has made a clearer statement on the implementation time, which is conducive to the preparation of vehicle and engine companies for production and technology research and development. It is understood that to maintain the normal operation of the State IV Diesel Engine SCR catalytic reduction device, trucks, passenger cars and other commercial vehicles must be able to add urea solution in time while driving, and at present there are only a few gas stations in major cities have urea filling stations; Coupled with the short-term national IV oil products are difficult to spread throughout the country, these are considered to be an important reason for the environmental protection department to delay the implementation of the National IV.
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For the multi-Cylinder Diesel Engine , each cylinder of working cycle has four processes: intake, compression, power and exhaust. In a working cycle, only one stroke is work. The remaining three trips are to create conditions for the auxiliary stroke power stroke
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