Calculation method of thermodynamic parameters in four-stroke diesel engine ventilation process

Abstract

The invention discloses a method for calculating thermodynamic parameters in the ventilation process of a four-stroke diesel engine. The invention is based on the fact that the intake air volume of the diesel engine system is equal to the sum of the air intake volume and the scavenging volume of the cylinder, and is related to the gas distribution phase angle and the closing time of the exhaust valve. The air intake volume in the cylinder at the time when the intake valve is closed, the calculation model of the intake air volume of the diesel engine system during the intake process of the four-stroke diesel engine is constructed; Gas volume, construct a calculation model for the thermal parameters of the exhaust pipe at the end of each exhaust process of the four-stroke diesel engine; use the constructed model to obtain the thermal parameters of the diesel engine's ventilation process. The invention has the advantages of simplicity, strong practicability and high precision, and the error with the actual thermal parameter is within 3%.

Description

technical field [0001] The invention belongs to the technical field of thermal process simulation of diesel engine performance, and in particular relates to a calculation method for thermal parameters of a four-stroke diesel engine ventilation process. Background technique [0002] The research on the gas exchange process of diesel engine mainly includes test method and computer numerical simulation method. The test method is the use of relevant test technology to conduct research on simulation and test machines, which is the premise and basis of theoretical research. However, due to the limitations of its superficial data, a single test method has been difficult to meet the research needs. At present, the calculation models used in numerical simulation methods can be roughly divided into filling and emptying method, mean value modeling, linearized modeling, and quasi-steady modeling. Wait. "Volume method model" is a commonly used analysis method for the ventilation proce...

AI Technical Summary

Problems solved by technology

"Volume method model" is a commonly used analysis method for the ventilation process of four-stroke diesel engines. It is mainly based on the solution of the differential equation about the crank angle of the mass and internal energy in the cylinder. It is very useful for the detailed experimental analysis of the engine, and its analysis results are rich. , meticulous and accurate, but requires a high-performance computer, a large computing space, a long computing time and a large number of parameter fitting

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