Transient fuel control method for air inlet passage injection type gasoline engine

Abstract

The invention discloses a transient fuel control method which is simple and effect and aims at actual application. The transient fuel control method can be divided into short fuel film control, long fuel film control and fuel attenuation control. The short fuel film control is used for fast compensating the evaporated fuel film on the inner wall of a manifold. The long fuel film control is used for being matched with the short fuel film to prevent vehicle jittering. The transient fuel attenuation control controls the attenuation of both the short fuel film control and the long fuel film control. The transient fuel control method is important content of emission calibration. The transient fuel control method has the advantages that each key parameter which influences fuel quantity and air quantity is taken into full consideration, and the method is theoretically consistent with a fuel film evaporation theory, that is to say, the air-fuel ratio of the mixed air in a cylinder is allowed to theoretical; engine rotation speed and car speed can be increased fast, and transient power requirements can be satisfied.

Description

technical field [0001] The invention relates to the field of automobile fuel control, in particular to a transient fuel control method for an intake port injection gasoline engine. Background technique [0002] For the port injection gasoline engine, the fuel is injected on the back of the intake valve, and the combustion heat transmitted by the intake valve is used to heat the oil film, accelerate the evaporation of fuel, and obtain a good atomization effect. The engine with this injection method must have a "wet wall effect", that is, only part of the injected fuel enters the cylinder to participate in combustion, and the other part is deposited on the inner wall of the intake port to form an oil film. [0003] The throttle valve controls the intake air volume of the engine. When the engine accelerates, the throttle valve opens suddenly, the pressure of the intake pipe increases suddenly, the fuel evaporation slows down, and the fuel deposits on the inner wall of the intak...

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Problems solved by technology

[0011] The disadvantages of the above methods are: some parameters are not considered comprehensive enough, and some use complex mathematical algorithms

Due to the limited computing power and memory of the single-chip computer, some parameters in the engine control strategy need to be captured in a very short time. If complex mathematical algorithms are used, there are high requirements for the memory and operation speed of the single-chip computer, and the real-time performance is poor. Memory resources are consumed too much Big

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