Testing method and device of single cylinder engine simulation complete machine

Abstract

The invention discloses a testing method and device of a single cylinder engine simulation complete machine. The testing method comprises the following steps: S1 establishing simulation models; S2 operating a complete machine simulation model to obtain complete machine high-pressure indicated pressure and boundary parameters; S3 operating a single cylinder engine simulation model, and adjusting the high-pressure indicated pressure and the boundary parameters of the single cylinder engine simulation model to be equal to those of the complete machine; S4 operating a solid single cylinder engine to be detected and adjusting the high-pressure indicated pressure to be equal to that of the complete machine; adjusting an air inlet pressure adjusting valve, an air inlet temperature heater and an air discharging back pressure valve to be equal to records in the step S3; S5 substituting a combustion heat releasing rate curve of the solid single cylinder engine into the complete machine simulation model; S6 judging whether an error is greater than a preset ratio or not; S7 processing parameters of the solid single cylinder engine. The complete machine simulation model and the single cylinder engine simulation model are established, and air inlet pressure, air inlet temperature and air discharging back pressure are repeatedly debugged on the solid single cylinder engine to obtain reasonable parameters of the complete machine to be simulated, so that the precision of single cylinder engine simulation complete machines including diesel engines and the like is improved.

Description

technical field [0001] The invention relates to a test method and device for simulating a complete machine of a single-cylinder machine. Background technique [0002] At present, using single-cylinder engine test to predict the performance index of diesel engine can greatly reduce the workload of the whole engine test, which is of great significance for reducing the development cost of diesel engine and shortening the development cycle of diesel engine. The output of large diesel engine is small, the production cycle is long, the manufacturing cost of diesel engine is high, and the test cost is high, so it is often used as the main test prototype. [0003] The key to accurately simulating the performance index of the whole machine in the single-cylinder engine test is that the work done in the cylinder combustion stage and the intake and exhaust boundaries in the combustion stage are consistent with the whole machine. The work done in the combustion stage in the cylinder re...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the defects of large error when the cost single-cylinder machine simulates the whole machine in the prior art, and provide a test method and device for the single-cylinder machine to simulate the whole machine with smaller error and higher precision

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