On July 10, 2008, sponsored by China Automotive Dynamics Network, Guangxi Yuchai Machinery Co., Ltd. and China Yipinma Group co-organized the “2008 China Engine Industry Information Joint Conference Supported by the Motor Vehicle Sewage Disposal Monitoring Center of Ministry of Environmental Protection†The conference was held in Kunming, Yunnan. At the meeting, Mr. Xu Wanyi, the head of China Diesel Engine Co., Ltd. Yuchai Machinery Co., Ltd., made a report on the “Status and Development Trends of the State III Diesel Engineâ€. The report analyzes the advantages and disadvantages of the current technical route adopted by China's diesel engine companies in order to fully implement State III and develop new products.
Mr. Xu Wanyi pointed out that the regulations for exhaust emission of diesel vehicles have become increasingly stringent. With the approval of the State Council, starting from March 1, 2008, all cars with light-type ignition engines registered with the Beijing license (mass and commercial gasoline with a maximum total mass of 3.5 tons or less (cars) are subject to the implementation of State 4 standards; as of July 1, 2008, all public transport, sanitation, and postal services have been registered for Beijing-licensed heavy-duty compression-ignition engines and heavy-duty gas-fueled ignition engines (ie diesel and natural gas engines). The vehicle implements the national 4 emission standard and requires the installation of an on-board emission diagnostic system (OBD) that monitors the emission of nitrogen oxides. Since July 1, 2008, all newly-sold vehicles (gasoline, diesel) have been implemented nationwide. National III emission standards.
Emission regulations continue to strictly promote the technological advancement of diesel engines: the structure of diesel engines ranges from naturally aspirating to turbocharging, to turbocharging and intercooling, to EGR, control strategies, and transitions from mechanical control to electronic control; combustion processes Also from two valves to multiple valves, and increased fuel injection pressure; oil moisture and sulfur content have also been improved. In terms of technical routes, the current domestic use of high-pressure common rail, single pump, pump nozzles and electronically controlled inline pumps plus EGR four routes, from the perspective of foreign development, common rail and single pump is a more mature technology, but because of its The core components are monopolized by foreign companies such as Bosch, Denso and Delphi. Not only are the prices high, but the supply is also a problem. In order to solve this problem, domestic automakers and parts and components companies have jointly developed an electronically controlled inline pump plus EGR technology. This technology has obvious advantages in terms of cost and maintenance. Currently, it has been used in batches on the whole vehicle, and many companies are actively developing it.
As regards the development of products above State III, Mr. Xu believes that there are two alternative routes, EGR+PDF and SCR. Both routes have their own disadvantages. SCR requires an on-board urea container and requires a gas station to establish a urea-added infrastructure. EGR requires higher injection pressures, higher pressure boosts, greater cooling system capacity, better lubrication, and fuel consumption 10% higher than SCR. Currently, Yuchai and many companies have chosen the SCR route.
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