Research method for influence of EGR rate and EGR exhaust gas temperature on diesel engine emission

A technology of exhaust gas temperature and diesel engine, which is applied in the direction of engine testing, machine/structural component testing, internal combustion engine testing, etc. It can solve the problems of large financial resources and EGR system testing cost, and achieve low equipment requirements, shorten the research cycle, The effect of simple method

Inactive Publication Date: 2019-09-20
XIAN UNIV OF TECH
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Problems solved by technology

[0004] The purpose of the present invention is to provide a research method for the influence of EGR rate and EGR exhaust gas temperature on diesel engine emissions, which solves the technical problem that the detection of existing EGR systems consumes a lot of manpower, material resources and financial resources.

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  • Research method for influence of EGR rate and EGR exhaust gas temperature on diesel engine emission

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Embodiment Construction

[0021] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0022] The invention provides a research method for the influence of EGR rate and EGR exhaust gas temperature on the emission of diesel engines. The engine simulation software is used to establish the virtual prototype of the engine according to the existing engine model, and the engine is analyzed according to the torque external characteristic curve and the cylinder pressure curve of the engine. The simulation model is checked, and parameters such as cylinder combustion and crankcase structure are adjusted to make the simulation model approach the actual engine operation. Then build a virtual prototype model of the EGR system circuit on the basis of this model. Through the control of the EGR valve and the temperature of the EGR exhaust gas, the control of the mixing ratio of the exhaust gas and fresh air in the cylinder and the initial tempe...

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Abstract

The invention discloses a research method for the influence of an EGR rate and an EGR exhaust gas temperature on diesel engine emission. To be specific, the method includes: building an engine virtual prototype model based on actual model parameters of the engine and checking the model; building an EGR system loop based on the checked model; and then carrying out simulation testing on performances of the EGR system on the engine virtual prototype model with the EGR system. According to the disclosed method, the EGR system loop is built based on the engine simulation model; and the study of the influence on the diesel engine emission, torque, and oil consumption by the EGR system is carried out. The method is simple and is easy to implement; the research period is shortened effectively; the equipment requirement is low; and parameter data that can not be obtained or be obtained difficulty can be obtained by a simulation method to provide the data support for the EGR system study.

Description

technical field [0001] The invention belongs to the technical field of automobile engines, and relates to a research method for the influence of EGR rate and EGR exhaust gas temperature on diesel engine emission. Background technique [0002] With the rapid development of the automobile industry, the number of automobiles has increased sharply, and automobile exhaust has caused serious pollution to the urban atmosphere. Therefore, various countries and regions have formulated strict emission regulations. Therefore, the environmental protection technology of automobile engine has become an important topic in the development of engine technology, just like energy-saving technology. Exhaust gas recirculation (EGR) technology is a widely used emission control technology. The EGR system can introduce part of the exhaust gas from the engine into the intake pipe according to the temperature and load of the internal combustion engine, mix it with fresh air or fresh mixed gas, and th...

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Application Information

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IPC IPC(8): G01M15/10
CPCG01M15/102
Inventor 芮宏斌蔡斌郑文哲赵勇伟
Owner XIAN UNIV OF TECH
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