Construction method for engine testing working condition

Abstract

Various types of engines of heavy-duty commercial vehicles are in the presence, a finished vehicle is complex in configuration, in addition, since a production enterprise is committed to the improvement of vehicle fuel economic efficiency and handling performance, an engine and drive system technology changes and make a progress all the time, the direct collection of engine data for constructing atest loop is difficult to be suitable for the dynamic development of a technology, and the long-term applicability, the independence and the stability of a working condition are guaranteed. The invention puts forward a construction method for an engine testing working condition. The method comprises a transient state testing working condition and a steady state testing working condition. A CHTC (China heavy-duty commercial vehicle test cycle) working condition curve is taken as a basis to construct the transient state testing working condition; according to a transient state testing working condition curve, an engine speed-load percentage simultaneous distribution heat map is taken as a basis to construct the steady state testing working condition; and when the transient state testing working condition is established, through an engine transmission model, vehicle speed in the CHTC working condition curve is converted into the engine speed.

Description

Technical field [0001] The invention belongs to the field of transportation, in particular to a method for constructing engine test conditions. Background technique [0002] Reducing automobile exhaust emissions is a problem that the automobile industry must face and solve. Energy conservation and pollution prevention of heavy commercial vehicles are important measures for the green development of my country's motor vehicles. As the country's energy consumption and emission regulations become stricter, heavy commercial vehicles face greater challenges in the optimization of energy conservation and emission reduction technologies. [0003] The emission certification of heavy-duty commercial vehicles is indirectly certified through the engine bench test, in which the engine test conditions are the necessary input parameters for the bench test. At present, the European ETC transient cycle and ESC steady-state cycle are used in the engine bench test of my country's heavy commercial ve...

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Problems solved by technology

At present, the European ETC transient cycle and ESC steady-state cycle are used in the engine bench test of heavy commercial vehicles in my country. Domestic related research shows that the engine speed and load distribution characteristics in the actual operation of vehicles in my country are quite different from the above cycle, so There is a large deviation between the emission data under the actual working conditions and the certification results under the legal working conditions

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