Combustion and emission control method and device for flexible dual-fuel hpcc engine

Abstract

The invention discloses a flexible dual-fuel high pressure combustion chamber (HPCC) engine combustion and discharge control method and deivce. An engine comprises an air inlet channel oil injector, an air inlet valve, an air cylinder direct injection oil injector, a spark plug, an exhaust valve, a variable valve actuation (VVA) mechanism and an electronic control unit (ECU). The ECU respectively reads engine rotation speed signals and accelerator position signals, judges the engine current operation conditions according to the received engine rotation speed signals and accelerator position signals, determines the combustion mode, and further controls oil injection times, oil injection time and oil injection pulse width of two fuels, spark plug ignition time and VVA actions. According to the flexible dual-fuel HPCC engine combustion and discharge control method and deivce, different combustion modes are adopted for different loads, namely the combustion modes can be controlled timely and flexibly, and the characteristics of fuels in a cylinder can be controlled timely and flexibly; and the device has the advantages of various fuel flexibility and various fuel mode adaptability, and the purpose of effective and clean combustion in the normal working condition range of passenger vehicles can be achieved simply by adopting a diesel engine oxidation and catalyzing postprocessor DOC.

Description

technical field [0001] The invention relates to the technical field of internal combustion engines, in particular to a method and device for controlling combustion and emission of a dual-fuel engine that is flexible and adaptable to various fuels and uses a combination of intake port injection and in-cylinder direct injection. Background technique [0002] Under the dual pressure of energy and environmental crisis, it is necessary to break through the limits of the highest thermal efficiency and lowest emission of traditional internal combustion engines. Researchers have proposed a new generation of internal combustion engine combustion technology represented by Homogeneous Charge Compression Ignition (HCCI). Although HCCI can simultaneously reduce NOx and soot emissions and maintain high thermal efficiency, the combustion process is mainly controlled by chemical kinetics, which makes it difficult to control the ignition time and combustion reaction speed, and the operating r...

AI Technical Summary

Problems solved by technology

Although HCCI can simultaneously reduce NOx and soot emissions and maintain high thermal efficiency, the combustion process is mainly controlled by chemical kinetics, making it difficult to control the ignition time and combustion reaction speed, and the operating range is narrow

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