Compound injection dual fuel internal combustion engine variable egr intake system and method

Abstract

The invention belongs to the technical field of internal combustion engines, and particularly relates to a variable EGR air intake system of a compound injection dual-fuel internal combustion engine and a control method. Based on torque requirements under working conditions with different loads and the purpose of achieving the maximum EGR rate, the invention discloses the variable EGR air intake system and the control method. According to the system, the EGR distribution states can be quickly switched; when in middle and small loads, homogeneous EGR distribution is achieved in an internal combustion engine cylinder; when in high loads, layered EGR distribution is achieved in the internal combustion engine cylinder; a venturi tube and an airflow pressure stabilization cavity are mounted on an EGR air intake introduction pipeline, so that the negative pressure in the pipeline can be conveniently controlled, the EGR tolerance is further improved, the exhaust gas pressure in the pipeline is maintained stable, and the airflow disturbance is reduced; the NOx emission can be effectively reduced, the requirements of loads for EGR distribution form and size are met, the internal combustion engine thermal efficiency can be improved, the fuel consumption rate is decreased, the fuel economy and emission performance of the internal combustion engine are effectively improved, and the large EGR rate is practicable.

Description

technical field [0001] The invention belongs to the technical field of internal combustion engines, and in particular relates to a variable EGR air intake system and a control method of a compound injection (in-cylinder direct injection plus gas port injection) dual-fuel ignition type internal combustion engine. It is suitable for compound injection dual fuel ignition type internal combustion engine adopting EGR technology. Background technique [0002] Petroleum is a non-renewable fossil energy. With the rapid development of the world economy and the rapid increase of automobile production and ownership, the pressure on oil demand is also increasing. How to achieve cleaner and more efficient combustion has become a major issue in the world. The main problems faced by automobile manufacturers, so countries around the world have extensively carried out research on alternative fuels for automobile internal combustion engines and EGR technology. In-cylinder direct injection in...

AI Technical Summary

Problems solved by technology

[0005] At present, for the EGR technology used on ignition internal combustion engines, there is only a single form of EGR intake air distribution, but there is a lack of variable EGR distribution technology based on internal combustion engine load demand adjustment

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