Engine exhaust flow calculation method and system

Abstract

The invention discloses an engine exhaust flow calculation method and a system based on exhaust pressure difference. The engine exhaust flow can be calculated according to the real-time rotating speedof an engine. The method comprises the following steps of obtaining current engine exhaust pressure difference data, engine exhaust temperature data, engine exhaust absolute pressure data and enginerotating speed data; performing multi-point moving average fairing filtering processing on the current engine exhaust pressure difference data; calculating a single cycle period of the engine according to the engine speed; calculating the average point number of the engine exhaust pressure difference according to the engine single cycle period; averaging the current engine exhaust pressure difference data subjected to the multi-point moving average fairing according to the pressure difference average point number to obtain an engine average exhaust pressure difference; and calculating the exhaust flow value of the engine by utilizing the average exhaust pressure difference of the engine.

Description

technical field [0001] The present disclosure relates to the technical field of engine testing, in particular to a method and system for calculating engine exhaust flow based on exhaust pressure difference. Background technique [0002] As an indispensable power output device for human society, the engine plays a vital role in our daily life. From the design and development of the engine to the loading application, there are several tests in between. Especially in today's increasingly stringent emission regulations, engine emission testing is becoming more and more important. The engine exhaust flow rate is a crucial parameter in engine testing. Based on this parameter, the engine emission value can be estimated and compared with regulations. [0003] The exhaust flow of the engine is due to its high temperature, large pulsation, and the fact that the flow detection equipment cannot produce a large pressure drop, which affects the normal operation of the engine. At present...

AI Technical Summary

Problems solved by technology

At present, most of the differential pressure flowmeters adopt the method of continuous fixed-point moving average, which has the following disadvantages: (1) The number of moving average points is large, and the processing speed of the processor is slow; (2) It cannot be linked to the engine speed, and the dynamic Not responsive enough

[0005] The inventor found during the research and development process that the method of measuring engine exhaust flow based on differential pressure usually has higher requirements on the acquisition system, which requires a higher acquisition frequency and resolution, which undoubtedly increases the complexity and price of the system

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