Optimization method for integrated optimization matching of EGR system and pressurization system

Abstract

The invention belongs to the technical field of engines, and discloses an optimization method for integrated optimization matching of an EGR system and a pressurization system, and the optimization method for the integrated optimization matching of the EGR system and the pressurization system comprises the steps: building and verifying a simulation model of the working process of a supercharged engine; performing system characteristic simulation analysis on the Miller cycle supercharged engine; constructing an optimization algorithm for integrated optimization matching of the EGR system and the pressurization system; and optimizing the parameters of the EGR system and the supercharging system of the Miller cycle engine based on the genetic algorithm. According to the method, a certain domestic engine is used as a prototype engine for paper research, a mathematical model of the working process of each subsystem of the turbocharged gasoline engine is established, and the gasoline engine simulation calculation model established based on GT-POWER is compared with test data to verify the accuracy of the model; and the design of a high-efficiency domestic hybrid gasoline engine is promoted, the overall performance of the engine is improved, and important academic value significance and engineering application value are achieved.

Description

technical field [0001] The invention belongs to the technical field of engines, and in particular relates to an optimization method for the integration, optimization and matching of an EGR system and a supercharging system. Background technique [0002] At present, with the sharp increase in the number of automobiles in China, the demand for oil as a fuel source for automobiles is also rising rapidly. The increase in oil consumption has led to a substantial increase in the emission of carbon dioxide and other pollutants, and the increase in carbon emission is related to climate warming and the more important greenhouse effect. Facing the dual pressure of increasingly severe carbon emissions and rapidly growing energy consumption, China's energy structure is facing severe challenges. Therefore, it is necessary to actively promote and apply advanced engine energy-saving technologies under strict national energy-saving emission reduction and fuel consumption restrictions. Due...

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Problems solved by technology

[0059] (1) Although the Miller cycle engine has high thermal efficiency, the intake air recirculation leads to low engine power, especially under light load conditions

[0060] (2) Since the internal EGR system does not need to install a special EGR device, it can be realized only by opening and closing the intake and exhaust valves, so its structure is simple, but it is difficult to accurately control the EGR rate

[0061] (3) In te

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