In the overall downturn of the commercial vehicle market this year, natural gas products have performed well and have become a rare bright spot in the sluggish car market. In the commercial vehicle sector, natural gas passenger vehicles have maintained a good market performance. Even in this year's deteriorating truck market, natural gas trucks have performed well. Natural gas vehicle sales have also led to the sale of natural gas engines. In order to understand the situation of the natural gas engine market, the reporter did some research. Public enterprise competition The hot sales of natural gas vehicles have enabled major domestic engine manufacturers to join in the competition for the natural gas engine market. According to the relevant person in charge of the management department of FAW Xichai Management Co., Ltd., Xichai conducted research and development of natural gas engines as early as 10 years ago, using clean energy technology as an alternative fuel product that focuses on development. From 1998 to 2002, Xichai was mainly engaged in the development of dual-fuel engines. In 2003, it turned to the development of pure natural gas engines. In 2004, CA6SL1-24E3 was successfully developed. CA6SF2-19NE3 was successfully developed in 2006, and CA6SL1 and CA6SF2 were upgraded in 2008. Development and adaptive development of LNG. Following the lead of FAW Technology Center, it gradually developed high-power LNG natural gas engines. After 2010, it successfully developed three high-power LNG engines for the medium-duty LNG, CA6SL2-31E4N, 6SM2-37E4N, and CA6SN1-42E4N. Full coverage of natural gas engine power. At present, Xichai has the system capability of LNG engine sales, procurement, production, quality assurance, and thermal testing. The key components processing and assembly are capable of batch production. In 2012, it has an annual production capacity of 5,000 units. Through further technological transformation, it will have an annual production capacity of 20,000 units by 2015. In terms of sales, the above-mentioned person in charge said: “Xichai LNG products have actively participated in market competition after successful development. CA6SF2, CA6SL1, and CA6SL2 series of natural gas engines have gained good reputation and influence in the bus market. CA6SN1 is implemented on medium-sized mining trucks. Small batch sales have already had a good market foundation. In particular, the CA6SN1 has been recognized by users in harsh environments and has been successfully launched for the first time." Shanghai Diesel Engine Co., Ltd. (hereinafter referred to as Shangchai) also has a good performance in the natural gas engine market. According to related persons from Shangchai, natural gas engines are traditional superior products of Shangchai. Shangchai once occupied 70% of the market share in the large and medium-sized natural gas passenger car market. . Shangchai's leading products, the SC8DT and SC9DT series of natural gas engines, have compact structures and strong adaptability; low-speed torque and good dynamics; mature parts systems and low cost of use and maintenance have a wide range of applications in the bus market. Bus companies in Yinchuan, Xi’an, and Chongqing all have vehicles using diesel engines. Weichai also has a significant influence in the natural gas engine market. According to sources from the Weichai technical department, the development of the Weichai natural gas engine began in 2005. So far, a full range of gas engines has been developed. In 2008, Weichai jointly established Weichai Power Xikong New Energy Engine Co., Ltd. jointly with two other companies. The joint venture company has natural gas engine technology centered on high-pressure direct injection, integrating R&D, production, and sales into one, dedicated to China. And the international market provides natural gas engine series products for heavy truck, bus, marine, power generation, construction machinery and other fields. In March of this year, Weichai released China's first high-power, high-pressure, direct-injection natural gas engine and carried out a load matching test at Shaanxi Auto Heavy Truck. The performance indicators of the vehicles have reached the expected requirements, and will be delivered to the market one after another in small batches. Manufacturers are optimistic about market space Regarding the development prospects of the natural gas engine market, the relevant person in charge of Xichai said: “With the increasingly tense oil resources, China’s crude oil dependence on foreign countries has been increasing year by year, affecting China’s energy security. At the same time, China’s natural gas reserves are abundant, prices are low, and market demand is high. With the continuous increase in the proportion of natural gas in China’s primary energy sources, the research and development and mature applications of clean energy engines using natural gas as an alternative fuel can significantly reduce the cost of heavy trucks, effectively alleviate energy shortages, and reduce exhaust pollution. Energy vehicles, especially natural gas vehicles, are in line with various national laws and regulations and are strongly supported by the government. There will be great development in the LNG automobile industry in the future." The responsible person also stated that in response to Xichai's problems in the development of natural gas engine products, Xichai held a special natural gas conference in mid-June, and used natural gas engine products as an important part of Xichai's products to comprehensively plan and increase. Investment, strengthen personnel training, further optimize the natural gas engine development process, accelerate product improvement and design, and comprehensively improve product performance and reliability. Tan Xuguang, chairman of Weichai Power Co., Ltd., said that the first large-capacity, high-pressure, direct-injection, compression-ignition natural gas engine in Weichai announced that the energy-saving and emission reduction of China's internal combustion engine industry has a long way to go. China's crude oil dependence on foreign countries is as high as 60%, while the consumption of the internal combustion engine industry has reached 59.27%. Now the country's energy-saving and emission-reduction strategy puts forward higher energy-saving requirements for the internal combustion engine industry. Weichai, as one of the leading engines of Chinese engines, should shoulder the heavy responsibility of energy conservation and emission reduction. Social and government functional departments should formulate a series of relevant industrial policies to support the application and promotion of natural gas engines. The relevant person of Shangchai stated: “Shangchai has always been very optimistic about the natural gas engine market and began to develop the natural gas engine business 10 years ago. Afterwards, we will focus on exploring the natural gas engine market, increase its business share, and cultivate natural gas engines as an important profit for Shanghai Diesel Engine. point." Advantages of promotion Both LNG and CNG engines are natural gas engines. However, because natural gas is stored in different forms, it is also different in its use and promotion. The advantages of LNG engines in terms of economy, environmental protection and other aspects also make the market perform better. Regarding the advantages of LNG engines, Xichai relevant person in charge said: “LNG engines are more economical. Compared with CNG engines, LNG has relatively stable fuel performance, which not only saves oil resources but also has a lower price than diesel. The fuel cost of the vehicle is reduced, and the fuel cost per 100 kilometers is saved by more than 30%.The storage temperature of the LNG is low and the density is high, which not only facilitates storage and transportation, but also contributes to the weight reduction of the entire vehicle. Therefore, the vehicle driving the LNG engine has a longer driving range. At this point, LNG has more advantages than CNG, on the other hand, compared with common diesel engines, natural gas engines only need to match the oxidation catalytic tail gas aftertreatment device to meet the national IV standard, and the cost of emission standard upgrade is far lower than that of diesel. In terms of emissions, natural gas engines have reduced carbon monoxide emissions by 90%, carbon dioxide by 20%, hydrocarbons by 60%, and nitrogen oxides by 60%, helping to protect the environment. At the same time, natural gas engines are also reliable and durable. Natural gas engine does not produce carbon deposits, which can effectively reduce the wear of parts and components. Optimization of the structure, can withstand strong thermal load, extending engine life. Using optimum ignition coil and a spark plug, low maintenance costs. " Natural gas engines are not entirely free of defects. Because the operating principle is similar to that of gasoline engines, the thermal efficiency is lower than that of diesel engines. Therefore, the combustion temperature and exhaust temperature are higher than those of diesel engines, and the power is lower than that of diesel engines of the same displacement, and there is a problem that the wear resistance of valve seats deteriorates. . Lean-burn control strategy is adopted, which is sensitive to the ambient temperature, and the dynamic stability needs further improvement. The person in charge of Xichai stated that when developing and producing LNG engines, attention should be paid to the following two issues: “LNG engines are developed on the basis of diesel engines, but they differ greatly in structure and performance from diesel engines. The system and ignition system technologies are complex, and product reliability is a systematic project, involving all aspects, and the industrialization process is relatively long. On the other hand, China's gas facilities are not perfect, and the natural gas vehicle market is slow to cultivate, so long-term technical preparation is needed.†Surface Treatment Service Shenzhen Yuheng Precision Machinery Co., Ltd. , https://www.ypcncmachining.com