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Recently, the "Bus Engine Energy-saving and Environmental Protection and New Technology Exchange Conference" sponsored by the China Internal Combustion Engine Industry Association was held in Beijing. The conference was chaired by Xing Min, executive vice president and secretary-general of the China Internal Combustion Engine Industry Association. Leaders of various public transport companies from Beijing, Shanghai and other cities, relevant responsible persons of domestic engine companies, and many industry participants attended the conference. The conference conducted in-depth analysis and discussion on a series of current hot issues such as the new requirements for energy conservation and emission reduction in the bus industry and new technologies for the development of the engine industry.
The bus industry needs energy-saving and environmentally friendly products
At the meeting, major engine companies introduced some of the current research and development of public transport engines. Weichai Power Co., Ltd., Deputy Manager of the Passenger Vehicle Power Division of Weeping Diesel Power Co., Ltd., and Jin Qiang, an engineer, said: “Because the common operating conditions of buses are concentrated in the idling zone and low-speed, low-torque areas, we use low-speed power. The advantage is that it is safer and more reliable, and more economical. It saves 5% of the energy of the engine body and 10% of the energy of the whole vehicle. In the field of diesel-electric hybrid and gas-electric hybrid buses, it can improve the fuel economy of the vehicle by 30% and reduce emissions. 30%."
Tang Hao, Deputy Director of the Research and Development Department of Wuxi Diesel Engine Factory of FAW Jiefang Automobile Co., Ltd. pointed out that currently the engine manufacturers do not manufacture products for the bus sector. “For buses, the operating area of ​​the engine will vary greatly due to the different operating routes, traffic conditions, and driver’s operating habits. Xichai uses a VNT nozzle booster to regulate the cross-sectional area of ​​the nozzle VANE. Change the flow rate, pressure, and flow of exhaust gas into the volute to optimize intake pressure and reduce pumping losses to increase engine torque.For bus-specific models, a wider range of low fuel consumption speeds, a 5%~10 reduction in vehicle fuel consumption %.†Tang said.
The earlier Guangxi Yuchai entered the passenger vehicle sector also had its own understanding on the bus-dedicated engines: “Urban buses have features such as low average speed, frequent start-up acceleration, and faster shifting of gears. Yuchai designed and developed a diesel engine for these conditions. Oil technology ensures the economy of bus operation, said Wang Hui, chief engineer of engine combustion technology for light vehicles at the Engineering Research Institute of Guangxi Yuchai Machinery Co., Ltd.
Insufficient autonomous engine
In fact, there is still a certain gap between the development level of China's internal combustion engine industry and that of the international market. The core technologies of the engine's related parts and components are still in the hands of foreign companies. Mr. Xu, the person in charge of Beijing Bafangda Bus Company, deeply feels this. "After several years of use, we have found that the difference between domestic brands and foreign brands in product performance is not obvious. However, in terms of maintenance costs, since the core components of domestic products are all foreign brands, their cost is much higher. Moreover, the upgrading of self-owned brand products is relatively frequent, resulting in a lack of commonality in maintenance. The comparison of imported brands' after-sales maintenance has become a system, which is also a direction for domestic independent brands to strive for in the future, said Xu.
Chang Chung, Minister of Changchun Public Transport Technology Department, said: “The EFI system has gradually replaced the traditional mechanical systems (such as carburetor) to control the engine's fuel supply process. However, in actual use, buses using carburetor are more use than The buses of the electronic control devices are more fuel-efficient.†Wu Yongsen, deputy general manager of the original Shanghai Bus and Wuxi Bus Company, also stated that there are obvious shortages of domestic engines compared to imported brands, but domestic brands have never had a vicious accident for many years. There are foreign brands, at this point domestic brands are still worthy of recognition.
In response to the current demand for the use of engines in the bus industry, Xing Min pointed out that it is imperative to speed up the development of energy-saving and environmental-friendly technologies for bus engines. "To promote energy-saving and emission-reduction work, we must base our efforts on ensuring China's energy security, coping with climate change, and improving the competitiveness of the internal combustion engine industry, with a view to reducing energy consumption and reducing carbon dioxide emissions as the main line, with the overall goal of reducing fuel consumption and playing a major role in the enterprise. , Focus on breakthroughs, accelerate the research, development and promotion of new technologies for internal combustion engine energy-saving, speed up the diversified application of internal combustion engine energy, and accelerate the development of remanufacturing industry."
With good printing performance of rolling material for multi-color continuous printing.
With 360 degree of installment equip, ease of operation, and stability. The part of transmission is adopted with gear structure with full sealing lubrication.
The tension system is adopted with magnetic powder clutch controller, the parts of rewinding is adopted with torque motor With double oven passage design, fast printing. Winding and rewinding are both double working mechanisms to make the material complete with non-stop.
Printing mode of color-range from one to eight colors can be chosen freely at will.
Bus companies value fuel-efficient and environmentally friendly engines