A control method capable of realizing high-efficiency clean compression ignition of gasoline in the full range of operating conditions

Abstract

The invention discloses a control method capable of realizing high-efficiency clean compression ignition of gasoline in the full range of working conditions: the electronic control unit reads the engine speed signal and the accelerator pedal position signal, and judges the operating condition of the engine; if the judgment result of the first step is The engine is in the start-up or light-load condition, and the engine adopts in-cylinder direct injection, internal EGR, and executes the corresponding intake air temperature control strategy and intake valve control strategy; In general, the engine adopts a dual-injection strategy combining port injection and in-cylinder direct injection, and at the same time cooperates with an appropriate proportion of external intercooler EGR rate, and implements a corresponding intake air temperature control strategy and intake valve control strategy. The invention solves the problem of high particle number emission existing in the current in-cylinder direct injection technology, and solves the problem of rough operation at high load in order to improve gasoline compression ignition combustion instability at low load.

Description

technical field [0001] The invention relates to the field of internal combustion engines, and more specifically relates to a control method capable of realizing high-efficiency 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 is widely used. ...

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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 method that can realize high-efficiency clean compression ignition of gasoline in the full range of working conditions, and solve the problem of high particle number emissions in the current in-cylinder direct injection (GDI) technology. 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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