China is the oil importing countries, so save fuel internal combustion engine industry has been an important industrial policy. At present, China's passenger car diesel engine development is still blank. For now diesel-powered, usually high noise, high vibration, high pollution phenomenon has gone forever. A new generation of diesel engines has been almost entirely the use of standard gasoline engines to meet the higher level user's needs. In China, even though many of diesel engine production enterprises such as: the fuel, Yuchai, the firewood, Xichai are already developed the use of advanced technology to achieve national environmental standards for diesel engines, but it does not mean diesel engine in the development of our country has entered easy, some of the external factors constraining its promotion and application:

China has yet to be upgrading the quality of diesel. Fuel quality will have a direct impact on the normal operation of automobile engine life, fuel consumption and exhaust emissions, the need for environment-friendly engines matched with the clean fuel, high-quality implementation of the fuel emission standards prerequisite. Many countries have adopted the mandatory regulations to improve fuel quality. China's diesel and the current poor quality, high-sulphur, which is only equivalent Europe and the United States pre-1990 levels, diesel standards proposed amendments are seriously lagging behind.