A diesel engine in-cylinder pressure feedback control device, control system and method

Abstract

The invention relates to a pressure feedback control device, control system and control method in a diesel engine cylinder. Each cylinder pressure sensor device and angle marker of the control device are connected to the input of the combustion feedback unit; the output of the combustion feedback unit is connected to The input of the fuel injection wear control unit; the output of the fuel injection wear control unit is connected to the indicator light. The combustion feedback unit calculates the combustion phase CA50 of each cylinder according to the cylinder pressure signal and the crank angle signal. The fuel injection wear control unit compares the current fuel injection advance angle of each cylinder with the initial value of the fuel injection advance angle. When the deviation exceeds the threshold, it judges that the fuel injector has excessive wear, and the output signal controls the corresponding indicator light to turn on. The invention can realize the wear judgment of a single fuel injector, and prompts for replacement when the wear is too large, thereby saving the use and maintenance cost of the user.

Description

technical field [0001] The invention belongs to the technical field of control, and relates to an in-cylinder pressure feedback control device, control system and method that can be used for heavy-duty diesel engines and light-duty diesel engines. Background technique [0002] At present, the diesel engine cylinder pressure feedback control technology is in the research stage in China, mainly based on low-temperature combustion technology based on cylinder pressure feedback control. Foreign countries mainly apply cylinder pressure feedback control technology in low-temperature combustion fields such as HCCI, which can effectively control the combustion state in the cylinder and make low-temperature combustion stable and efficient. At the same time, the cylinder pressure feedback control technology can also be applied to improve the unevenness of each cylinder, improve the dispersion of the system, improve the fuel adaptability of the engine, monitor the combustion state, and...

AI Technical Summary

Problems solved by technology

Some international suppliers such as BOSCH, denso and other companies, their control computer diagnosis strategy will judge the wear of the fuel injector according to the fuel supply status of the fuel pump, and prompt the user for maintenance, but cannot prompt the wear of a single fuel injector, and cannot fully identify a single fuel injector at the repair station. For the wear of the injector, the method of replacing all the injectors is usually adopted, which puts users under great economic pressure

At the same time, the wear of the injector will lead to the deterioration of combustion and the increase of fuel consumption. At present, BOSCH, denso and other companies have not carried out fuel injection correction, which is the main reason for the increase of fuel consumption.

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