Real-time monitoring method for highest temperature in cylinder head of internal combustion engine

Abstract

The invention discloses a real-time monitoring method for the highest temperature in a cylinder head of an internal combustion engine. The real-time monitoring method includes the steps that (1) a temperature measuring experiment for the cylinder head of the internal combustion engine is conducted, and numerical simulation of a cylinder head temperature field is conducted, so that the highest temperature, temperature distribution and heat flow distribution in the cylinder head are obtained; (2) numerical simulation of external flow of the internal combustion engine is carried out, and the position of a peripheral temperature measuring point on the cylinder head is obtained; (3) a correlation model for the highest temperature in the cylinder head and the temperature at the peripheral temperature measuring point is determined by means of results of the highest temperature, temperature distribution and heat flow distribution; and (4) during actual work of the internal combustion engine, by measuring the temperature of the peripheral temperature measuring point of the cylinder head in real time with the peripheral temperature measuring point as a temperature measuring point and utilizing a calibrated thermal network model, the highest temperature in the cylinder head can be obtained in real time through inverse estimation. By means of the real-time monitoring method, real-time monitoring on the highest temperature of high-temperature parts which cannot be directly measured or are not suitable for being directly measured for a long time can be achieved, and the reliability of the parts is ensured.

Description

technical field [0001] The invention belongs to the technical field of internal combustion engines, and in particular relates to a method for real-time monitoring of the maximum temperature in a cylinder head of an internal combustion engine. Background technique [0002] As one of the most widely used power machines, the internal combustion engine is widely used in automobiles, ships, railways, construction, agriculture and other fields, and has become an indispensable part of national construction. With the development of my country's economy and the advancement of science and technology, the internal combustion engine industry has developed vigorously, and the assembly of internal combustion engines in mobile machinery such as automobiles, ships, and aircraft has increased significantly. With the development of internal combustion engine technology and the improvement of social needs, the power density of internal combustion engines is getting higher and higher, which mak...

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Problems solved by technology

However, the above method cannot directly measure the maximum temperature of the "nose bridge area" of the fire surface, and there are many small holes for measurement, which will affect the temperature field distribution of the cylinder head, reduce the strength of the cylinder head, and accelerate the damage of the cylinder head; in addition , the fluid-solid coupling numerical method needs to carry out numerical simulation offline on the temperature data measured in the experiment in step 1, and it is impossible to know the maximum temperature in the cylinder head in real time when the internal combustion engine is working, so it is impossible to calculate the maximum temperature of the cylinder head under the actual working state of the internal combustion engine. real time monitoring

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