Environment for Dajiang Huainavista experts teach you to use the national engine
The national policy on diesel vehicles has been implemented for a period of time in the country. Recently, the reporter learned from some users that users generally do not fully understand the products of the state-owned diesel vehicles. In addition, the prices of the products of the National IV diesel vehicles are generally too high, and the users are deciding Whether buying hesitant. It is understood that in the first quarter sales in the card and heavy truck markets fell by more than 30% year-on-year, and the light -card market declined by more than 20%. This has a certain relationship with the implementation of the National IV policy. The national four-vehicle is mainly modified on the engine. The technical route of the national four-engine is mainly divided into two kinds of EGR and SCR. The engine adopting the EGR post-processing technology does not need to use vehicle urea, and is mainly used for light engines on light trucks. The engines that use the SCR after-treatment technology require urea, which is mainly used in medium- and heavy-duty engines. At present, due to the strict control of emission standards by the state, the intensity of supervision has increased. The truck manufacturers have now fully manufactured four trucks, and the three have already Prohibit sales. The reporter learned that, although the country has regulations and restrictions, in order to reduce costs, some truck users will add water to vehicle urea, as well as the purchase of low-grade car urea, and even some users will use the method of shielding OBD without adding urea and other channels. In response to this phenomenon, the reporter interviewed Wang Yuntao, a technical expert in the performance development department of JAC Navistar. He said that in order to support the national emission standards, JAC Navistar and some engine OEMs have fully taken into account this situation and diluted the water In the case of urea and the use of inferior urea, technical precautions were taken. Jianghuai Navistar State 4 Engine ECU is equipped with sensors. When the nitrogen oxide emission reaches 5g/kW·h, the alarm signal will be displayed on the dashboard of the vehicle; when the nitrogen oxide emission reaches 7g/kW·h The engine will immediately restrict torsion, this situation is generally exhausted car urea or no urea at all, if the use of poor quality car urea will also seriously damage the SCR system, and a set of SCR processing equipment is very expensive , To repair or replace will not be worth the candle, so Jianghuai Navistar reminds the correct use of vehicle urea is essential. Wang Yuntao pointed out to reporters that for some users who illegally shielded the engine OBD, vehicles that do not use vehicle urea could not be detected by the engine ECU. For this reason, JAC Navistar controls the source. First of all, the engine ECU has strict control measures. Only high-level personnel have the authority to access the ECU of the engine. If any illegal OBD is discovered, it will be dealt with seriously. The engine will have the right to refuse any future problems. The implementation of the Fourth National Policy has brought a great deal of pressure to users. According to the statistics of the reporter, the four national models currently sold on the market, the light trucks are generally more expensive than the national three models, and the heavy trucks are 20,000 to 20,000. The consumption of urea solution for vehicles is about 3%-5% of that for diesel fuel. The price of urea for automobiles on the general market was calculated by a reporter. It takes about 16 yuan per 100 kilometers for vehicle urea and one year for a heavy vehicle. Calculating from 100,000 kilometers, it will cost about 15,000 yuan more, which will increase users' operating costs. However, the society is always making progress. Users feel the driving comfort and safety improvement while they feel the cost of car purchase and the increase of the use cost. The most important thing is that the environment will also benefit. In fact, if considering environmental protection, users should not ignore the environmental sustainability for the benefit of the moment. Let's talk about this, recalling the “Under the Dome†in 2014 and taking a look at the sandstorms and haze that have broken out across the country. If we think about the various environmental issues that have erupted in recent years, should we do some reflections? If we do not begin to pay attention to environmental protection, who will pay for us in the future?
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There are four phenomena in the market 
Wang Yuntao, Technical Expert, Performance Development Department, Jianghuai Navistar 
Jianghuai Navistar State Fourth Engine