Turbosupercharging through-flow matching method for internal combustion engine

Abstract

The invention relates to a turbosupercharging through-flow matching method for an internal combustion engine, which is characterized by comprising the following steps: 1) clearing the characteristics of cyclic operation conditions and performance parameter target values of the internal combustion engine against the target internal combustion engine, thereby determining the required performance parameter target values of a turbine and a gas compressor in a turbosupercharger; 2) selecting geometric parameters of the gas compressor and the turbine according to the performance parameter target values which are determined in the step 1) of the gas compressor and the turbine in the turbosupercharger, combining with parameters of the internal combustion engine, and calculating performance parameter values of the internal combustion engine; and 3) judging whether the performance parameters calculated in the step 2) of the internal combustion engine reach the target values determined in the step 1) or not, and outputting the geometric parameters of the turbine and a supercharger in the turbosupercharger when achieving the target values; otherwise, adjusting the geometric parameters of the turbine and the supercharger and returning to the step 2). The method has short cycle and low cost, and can improve the all condition performances of the internal combustion engine, and be applicable to the field of design and matching of the turbosuperchargers.

Description

technical field [0001] The invention relates to a turbocharging flow matching method for an internal combustion engine. Background technique [0002] Turbocharging technology is an energy-saving and CO 2 The key technology of emission reduction, turbocharger design and supercharging system matching method have an important impact on improving the performance of supercharged internal combustion engines. As the requirements for the economy, power and emissions of internal combustion engines continue to increase, the design and matching method of turbochargers have gradually become the key to restricting the performance of internal combustion engines. In addition, the emergence of compound supercharging technology and variable cross-section supercharging technology also puts forward higher requirements for the design and matching method of turbochargers. [0003] The traditional turbocharger matching method is mainly based on the turbocharger performance test MAP diagram, whi...

AI Technical Summary

Problems solved by technology

In this method, the geometric parameters of the turbocharger cannot be changed freely, and the relationship between the geometric parameters of the turbocharger and the performance of the internal combustion engine cannot be directly established, making it difficult to carry out the integrated design and optimization of the internal combustion engine and turbocharger

(2) The existing turbocharger performance test methods are difficult to cover all the working conditions of the turbine and compressor when the whole machine is running. For this, interpolation and extrapolation are usually used when matching turbochargers. Its accuracy is low, and it is difficult to meet the transient matching requirements of boosting in vehicle working conditions

(3) In complex supercharging schemes such as compound supercharging and variable cross-section supercharging, the range of the supercharger performance MAP diagram is large, which increases the difficulty of the experiment and the coverage of the data, making the supercharging of these schemes Matching is very difficult under the matching method based on the experimental MAP graph

(4) Due to the matching method of the turbocharger test MAP diagram, repeated type selection and testing are required, and there are disadvantages such as long matching period and high cost

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