Ⅳ emission standards for diesel vehicles this year, to be implemented July 1. Due to heavy vehicles make the country Ⅳ emission SCR technology widely used route, you need to add urea solution. Many companies saw this market, join the ranks of automotive production and sales of urea solution, and vehicle quality urea solution is directly related to whether the normal operation of the vehicle, there is an urgent need to be standardized. Today, however, the national standard urea solution yet to be introduced. China Beijing, Shenzhen, Shanghai has only three places where the standard car with urea solution. China is a large agricultural country, the amount of production and use of urea impressive, but car urea solution in the preparation and production of urea for agricultural use, but with a big difference. Deputy director of the State Key Laboratory of Engines, Tianjin University Yaochun De said vehicle urea solution refers to the urea concentration of 32.5% urea solution, you must use high-purity water as a solution in the preparation process, the use of water as a common solution will result in urea solution too many impurities, and high or low concentrations of urea, urea solution crystallization solution will cause performance degradation or frost. If the vehicle does not meet the standard urea solution, engine exhaust after-treatment system will be greatly affected. This is the significance of the development of technical specifications. How can we ensure that after the implementation of the country Ⅳ emissions, vehicle urea solution in the production and use of links to spec? By reporters, industry experts and business people are believed to promote the car needs more joint efforts with the specification urea solution. After the implementation of the country Ⅳ emission standards, vehicle urea solution will undoubtedly be using SCR exhaust aftertreatment system of the vehicle as a necessity. The interesting is, whether it is on the network, or in real life, there is a sound, the country Ⅳ car without urea okay? * Certainly is not. According Yaochun De introduction, through the car automatically diagnose system (OBDⅡ) can monitor whether the vehicle using the vehicle of urea. By a sensor monitoring the content of nitrogen oxides in the exhaust gas after-treatment system of nitrogen oxides, if the content of nitrogen oxides in the exhaust gas exceeds the limit, ECU the engine speed and torque will be limited, forcing the vehicle user to add urea. Qin Jian believes that by vehicles or exhaust after treatment strategies to monitor whether the vehicle urea only one hand, more importantly, for the majority of the vehicle after the driver and vehicle exhaust treatment popularize knowledge urea solution, so that they truly understand that adding urea importance. Vehicle control strategies were developed after all, it is understood that the current market has already been engaged in the crack OBD system to monitor urea functions. And the premise does not currently have enforceable standards, technical specifications can really be implemented, many industry experts and business people have recognized the need to strengthen the guidance and supervision of the government. In addition, I hope the car with the national standard urea solution as soon as possible. Vehicle urea storage temperature required given life vehicles on the four countries of urea SCR system for heavy trucks we already know, the four countries for the implementation of such an important part of what the storage requirements? It is demanding requirements of the container? Are sensitive to temperature changes? Chinese truck net "you do not understand vehicle urea" series continues topic for you in detail. Due to its basic characteristics, vehicle storage materials for urea has special requirements, while automotive urea solution shelf life but will change with temperature. Car alkaline urea, copper, cast iron, solder, cast aluminum corrosion great. Because of the water-soluble urea crystallization point is -11 ℃, so some pumping pipeline needs insulation, while the temperature is not too large, easily lead to decomposition of urea.