China is expected to compete with Europe and the United States in the field of energy saving for medium and heavy commercial vehicles

Ministry of Industry and Information Industry seeks advice from the industry on the measurement of fuel consumption of medium and heavy commercial vehicles

For a long time, China's medium- and heavy-duty commercial vehicles have no standard method for measuring fuel consumption. The reporter learned from the website of the Ministry of Industry and Information Technology on June 1 that the recently recommended national standard “Measuring methods for the fuel consumption of medium and heavy commercial vehicles” (hereinafter referred to as the “Methods”) has been issued by the Ministry of Industry and Information Technology of the Ministry of Industry and Information Technology to collect opinions from the industry and enterprises. To all related companies and departments.

The "Method" is based on the "Notice on the Structural Adjustment Opinions of the Auto Industry" issued by the National Development and Reform Commission in 2006. It states that "the limits of fuel consumption for large-scale commercial vehicles shall be issued as soon as possible" and the State Council shall "enhance fuel-saving measures further in 2008." The requirements for improving the fuel economy of vehicles required in the notice of power-saving work clearly require that “the introduction of the standards for the limits of fuel consumption for heavy-duty commercial vehicles” should be stipulated, and that the State Standardization Administration Committee should release the resource conservation in 2008 in December 2008. It has been compiled and formulated in accordance with the spirit of documents such as the comprehensive utilization of national standard revision plans.

Using chassis dynamometer method and simulation calculation method

The production and modification of medium- and heavy-duty commercial vehicles in China are numerous, and the vehicle models and supporting engine models are relatively complicated, and the technical level is uneven. The use and the conditions of use of medium- and heavy-duty commercial vehicles are complex. Therefore, the "Method" firstly studies and analyzes the ownership structure and technical level of heavy-duty commercial vehicles, and classifies heavy commercial vehicles into different categories according to their uses and conditions of use. Based on different types of vehicles, it can be determined to represent their uses and The actual driving conditions of the typical driving conditions, and then study the corresponding test methods.

The relevant person in charge of the China Automotive Technology and Research Center, which is responsible for organizing the "Methods", told reporters that the determination of the fuel consumption of medium- and heavy-duty commercial vehicles can be carried out through road tests, drum tests, and simulation tests. Among them, the road test has lower requirements on the equipment, the test is simple and easy, and can be used for the determination of constant speed fuel consumption with relatively simple test conditions. However, the test is easily affected by road conditions and test personnel, and the comparability and repeatability are poor. In addition, road tests are only suitable for simple modal conditions and cannot achieve transient conditions (field, driving). Drum test can simulate a variety of complex road test conditions and test data is reliable and repeatable; but large drums are more expensive, especially vehicle load, sliding resistance settings have a greater impact on the results. Based on the engine test, the simulation test method can simulate and measure the fuel consumption of the vehicle under various operating conditions on a computer. It has the advantages of reliable data and good repeatability, and the cost is relatively low. The accurate engine map is a simulation test. The necessary conditions of the law; In addition, vehicle load and coasting resistance settings have a greater impact on the results.

After a comprehensive analysis of the advantages and disadvantages of the above various test schemes, it was determined that a parallel study of drum tests and simulation tests was conducted. At the same time, two test schemes, chassis dynamometer method and simulation calculation method, were proposed: For basic vehicles, chassis dynamometers should be used. The fuel consumption is determined by the machine method; for the variant vehicle, the vehicle manufacturer may choose to use a simulation calculation method or a chassis dynamometer method to determine the fuel consumption. The C-WTVC cycle adopted in the final "method" is composed of three parts: the urban area, the highway, and the high-speed operating conditions. It is based on the world's unified heavy-duty commercial vehicle transient vehicle cycle (WTVC, World Transient Vehicle Cycle). Adjust the driving cycle formed by acceleration and deceleration.

From staged consensus to request for comments text

"Method" from the preparation to the development of the formulation, is a process after many rounds of exploration, experimentation and consensus.

In May 2007, representatives of domestic and foreign commercial vehicle and engine manufacturers and experts organized by the China Automotive Technology and Research Center began to study the feasibility of formulating a fuel consumption limit standard for medium- and heavy-duty commercial vehicles in China. The meeting proposed an overall plan for the establishment of a fuel consumption standard system for medium- and heavy-duty commercial vehicles in China. The specific implementation steps are: First, the in-depth research and analysis of the ownership structure of medium- and heavy-duty commercial vehicles should be conducted. Commercial vehicles are divided into different types; secondly, according to different types of vehicles, typical driving conditions that can represent their uses and actual conditions of use are determined, and corresponding test methods are developed; thirdly, unified testing methods are applied to various types of major The statistical analysis of the technical level and fuel consumption status of medium- and heavy-duty commercial vehicles is based on in-depth and detailed statistical analysis. Based on the actual form of China's medium- and heavy-duty commercial vehicles, and in accordance with the national targets for energy conservation and consumption reduction, various types of Heavy commercial vehicle fuel consumption limits.

In June 2008, the "Preparatory Meeting for the Working Group on Standardization of Test Methods for Fuel Consumption of Heavy Commercial Vehicles" was held. It is considered that the simulation method is the most feasible under the current conditions, and the model classification and mileage allocation should be carefully studied; Research on the level of fuel consumption, driving resistance, and the current state of matching engine and transmission parameters should also be carried out.

From October 2008 to April 2010, the "Working Group for Standardization of Test Methods for Fuel Consumption of Medium- and Heavy-duty Commercial Vehicles" was established and held six working meetings successively. Several stages were reached for the simulation of the fuel consumption of medium- and heavy-duty commercial vehicles and the test methods. Consensus, including consensus on the framework of the standard framework, the improvement of procedures and functions, the determination of fuel density, adjustment of the drag coefficient of the original semi-trailer tractors, trucks and passenger cars, and the determination of the weighted coefficient table of the characteristic mileage allocation, etc. The text of the recommended national standard “Measuring method for fuel consumption of medium and heavy commercial vehicles” (draft for comment) was finally formed.

China is expected to compete with Europe and the United States on the fuel consumption measurement of medium- and heavy-duty commercial vehicles.

In 2009, China became the world’s largest automotive producer and automotive consumer market. With the continuous increase in the total number of car ownership, the proportion of vehicle fuel consumption in China’s total oil consumption has been increasing and it has become the main body of China’s new oil consumption. The resulting energy and environmental problems have become increasingly prominent, affecting China’s automobile industry. And other related industries for sustainable and healthy development.

The relevant person in charge of the "Standard Working Group for the Testing of Fuel Consumption of Medium-heavy Commercial Vehicles" stated that medium- and heavy-duty commercial vehicles, as the main body of China's road transport, especially passenger and cargo transportation, play an important role in the ownership of vehicles in China. However, due to the relative lag in technological development, the energy consumption of medium- and heavy-duty commercial vehicles has become increasingly prominent. There is a large gap between the fuel economy and the international advanced level. Prior to this, China has not established a national standard for testing fuel consumption of medium and heavy-duty commercial vehicles with a capacity of more than 3.5 tons and limits. This has led to high energy-consuming transport vehicles entering the road transportation industry, even though the road transport industry has taken a lot of energy conservation and consumption reduction. Measures also make it difficult to significantly reduce the energy consumption of vehicles.
In response to the increasing shortage of oil and gas and climate change caused by greenhouse gas emissions, the EU, the United States, Japan and other countries and regions have successively formulated or updated fuel economy regulations for passenger cars and light commercial vehicles. The requirements for fuel consumption of passenger cars and light vehicles have been tightened, and the focus of energy conservation in automobiles has shifted from passenger cars (light cars) to medium- and heavy-duty commercial vehicles. In 2006, Japan issued a test method and limit standard for the fuel consumption of medium- and heavy-duty commercial vehicles. In 2007, the "Energy Security and Independence Act" passed by the United States clearly required the Ministry of Transportation and the Environmental Protection Agency to jointly carry out fuel consumption legislation for medium- and heavy-duty commercial vehicles. Work; In addition, Europe is also working to establish a medium and heavy commercial vehicle fuel consumption evaluation method.

Since 2001, China has successively formulated and issued a series of technical standards and related policies aimed at improving the fuel economy of passenger vehicles and light commercial vehicles. It has played an active role in promoting the progress of energy-saving technologies in automobiles, and has effectively reduced The gap between China's light vehicle fuel consumption and foreign advanced level. In order to further promote the energy conservation of medium- and heavy-duty commercial vehicles, the national competent authorities clearly proposed to pay close attention to the test methods and limit standards for fuel consumption of heavy-duty commercial vehicles in Taiwan. If this standard combining China’s actual traffic and vehicle conditions can be implemented after perfection, it will greatly promote the domestic transportation market and medium- and heavy-duty commercial vehicle products in terms of energy saving, and thus affect related industries and The overall reduction in dependence on fossil fuels will stabilize and increase the competitive position of China's related products in the global market.

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