Control system and method capable of achieving efficient and clean compression ignition of gasoline in full condition range

Abstract

The invention discloses a control system and a method capable of achieving efficient and clean compression ignition of gasoline in a full condition range. The method comprises the steps of allowing anelectronic control unit to read an engine speed signal and an accelerator pedal position signal to judge an operation condition of an engine, if a judgment result in the first step is that the engineis under a start-up or small load condition, allowing the engine to adopt direct injection and internal EGR (exhaust gas recirculation) and execute a corresponding intake temperature control strategyand an intake valve control strategy, and if the judgment result of the first step is that the engine is under a moderate or heavy load condition, allowing the engine to employ a combined intake portinjection and direct injection strategy together with an appropriate external intercooling EGR rate and execute a corresponding intake temperature control strategy and an intake valve control strategy. The control system and the method solve the problems of high particle emission in the current direct injection technology, as well as unstable light load compression ignition and violent heavy loadcompression ignition of the gasoline.

Description

technical field [0001] The invention relates to the field of internal combustion engines, and more specifically relates to a control system and method capable of realizing high-efficiency and clean compression ignition of gasoline in the full range of working conditions. Background technique [0002] With the increasing number of automobiles, people pay more and more attention to their negative effects on energy and environment. Countries have also enacted stricter emission regulations to limit harmful emissions and CO 2 and other greenhouse gas emissions. Therefore, it is of great significance to explore the control technology of high-efficiency and clean combustion of internal combustion engines for countries to achieve energy conservation and emission reduction. [0003] The traditional gasoline engine is controlled by equivalence ratio combustion, and the aftertreatment can completely rely on a simple three-way catalyst. Because of its low cost and simple control, it i...

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies in the prior art, provide a control system and method capable of realizing high-efficiency clean compression ignition of gasoline in the full range of working conditions, and solve the problem of particle number emissions in the current in-cylinder direct injection (GDI) technology High problem; Solve the problem of unstable combustion at low load and rough work at high load in order to improve gasoline compression ignition

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