In a recent interview, relevant person in charge of a heavy truck company told reporters that despite the pressure of rising gas prices, most LNG heavy truck engines are currently optimized and improved on the basis of diesel engines and are not targeted at natural gas. Due to the special design and development of fuel characteristics, there is a lot of room for improvement in its technology and the prospects for LNG development are very large.
However, after the actual investigation, the reporter found that engine companies are not as optimistic about the development of LNG vehicles as vehicle manufacturers, and are also particularly interested in the development of gas engines.
OEMs: LNG heavy trucks grew optimistic <br> <br> due to its high economic, technological maturity, reliability, and other characteristics, with the guidance of national policy to develop natural gas in recent years, China's natural gas vehicles, especially commercial vehicles LNG Rapid development.
At the same time, gas price adjustment has become an unstable factor in the future development of LNG vehicles. It is estimated that when the gas price increase reaches the critical value of 0.75 times the fuel price, the economic advantage of LNG vehicles will be quickly lost. For example, after the Mid-China Development and Reform Commission raised the price of gas last year, there were heavy truck dealers who reflected many potential users and began to switch to diesel vehicles or wait and see, and LNG heavy truck sales were affected.
However, even if there are natural gas prices, due to the low sales base of LNG heavy trucks, the year-on-year growth in sales volume remains high. Heavy truck industry is still optimistic about the sales of LNG heavy trucks. Another point of view is that with the implementation of the National IV standard, due to the substantial increase in the cost of the National IV heavy truck, natural gas heavy trucks will usher in more market opportunities.
The relevant person in charge of the above-mentioned heavy truck companies further pointed out that China's natural gas vehicle technology is still in its infancy. Although gas prices have risen, natural gas has a broader prospect than gasoline and diesel as an energy substitute, and LNG heavy trucks have potential for technological upgrading. Very large, so he still optimistic about the prospects for the development of LNG heavy trucks.
Engine plant: the new R & D time-consuming <br> <br> no intention to present the majority of natural gas engines are based on diesel engines improved on to say, engine insiders responded that this development path in line with the gas machine.
“Gas engines are indeed transformed from diesel engines. This is not a unique practice in China.†Tang Wei, Vice Minister of Research and Development of FAW Xichai, said that foreign advanced engine companies are developing on the basis of diesel engines in the early stages of gas engine development. Optimized and improved. The reason why we did not choose forward R&D was mainly due to the low demand for gas engines and the high production cost of independent platforms. Based on cost considerations, most engine manufacturers gave up the research and development of new products.
"In fact, the cost is only one of them." Wang Hui, chief engineer of engine combustion technology for light vehicles at the Yuchai Engineering Research Institute, said that from a R&D point of view, the process of R&D and application of diesel engines is comparatively long-term. Taking it as a reference object, it can make gas. The performance of the machine is more reliable. Therefore, it should be considered as a more feasible solution on the basis of diesel engines.
In addition, Wang Hui pointed out that in the past gas engines only had demand in local areas, but the demand for gas engines has increased rapidly in recent years. If a new model is developed according to the characteristics of the gas engine at this time, the development cycle will take about five years, and the product stability and production consistency will also need to be verified for a long time. This kind of long-term R & D model must not be able to cope with the explosive growth demand. For these reasons, almost all domestic engine plants use diesel engines as prototypes to develop gas engines.
Dongfeng Chaochai chief designer Jia Guiqi told reporters that although the sales volume of gas engines has increased significantly in recent years, the current domestic engine plants are still mainly producing diesel engines, and the proportion of gas engines in the total output of enterprises is still very high. Small, therefore, it takes a lot of time and effort to develop new research and development, and it is probably not worth the candle.
Singing the bad prospect gas machine to enhance the limited space <br> A number of interviewees told reporters that they would not consider developing gas engine products specifically for the characteristics of natural gas, and some people even bluntly stated that “unless the gas engine is equivalent to diesel engine salesâ€.
So in terms of technology alone, there is much room for future gas engines to improve fuel economy. The engine industry's answer is not certain.
"Gas engines have room for improvement in technology." Tang said that before the automotive industry's investment in gas engines and R & D efforts were insufficient, with the rapid development of this market segment, the engine plant in the practice of continuous accumulation of experience, And formed a certain amount of technical reserves. However, at present, domestic gas engines still have certain gaps from foreign advanced products, whether they are from enhanced indicators, gas consumption, or emissions. “We are still in the initial stage, there are still many aspects that need to be upgraded and optimized. Therefore, there is definitely a potential for improvement in the future of gas engines,†he said.
Yao Chunde, deputy director of Tianjin University’s State Key Laboratory of Combustion of Internal Combustion Engines, also believes that from a technical point of view, the gas cylinder bore diameter is relatively large, and the flame propagation speed of natural gas is relatively slow, which restricts the gas engine further relying on spark ignition to improve performance.
Yao Chunde further stated that the main reason for the limited development potential of gas engines is the lack of gas resources. In addition, natural gas prices are bound to increase substantially as the government continues to push forward. Once the price advantage is lost, it will be difficult for gas engines to develop further.
Wang Hui also believes that although the gas engine still has many areas for improvement, he is not optimistic about its future development prospects. “The ease of use of products is an important factor in determining their future market prospects. For now, the natural gas supporting facilities are not complete, the gas source is not enough, and some areas even have serious 'gas shortages'. Once these negative factors affect the user's use, They are likely to consider replacing the diesel engine, so compared to the future, the diesel engine may have more market space than the gas engine,†he said.
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