Correcting method of crank angle value of combustion cylinder pressure testing curve of reciprocating engine

Abstract

The invention discloses a correcting method of the crank angle value of the combustion cylinder pressure testing curve of a reciprocating engine. In the shut-down state, the diesel engine 10 is moved to the theoretically top dead center position of an air cylinder to be measured through a jigger, thin sheet iron 6 is bonded onto a timing disk 11, a pulse sensor 7 is installed above the sheet iron 6, and the other end of the sensor 7 is connected into a combustion analysis meter 9. The diesel engine 10 is adjusted to be in the working condition in need of measurement, a fuel pump rack of the air cylinder to be measured is pulled up, and the curve generated by software in the combustion analysis meter 9 and a pulse signal of the pulse sensor at the moment are obtained. The angle value of the pulse signal is a, the angle position of the maximum cylinder pressure is b, the corrected crank angle value of the combustion cylinder pressure testing curve is -b+a, and therefore the position of the actual crank angle corresponding to the combustion cylinder pressure curve can be located accurately.

Description

technical field [0001] The invention relates to a method for correcting the crank angle value of the combustion cylinder pressure test curve of a reciprocating engine, belonging to the technical field of internal combustion engines. Background technique [0002] Testing the combustion cylinder pressure curve is an important means in the diesel engine combustion analysis test. Because it is difficult to drill holes in the cylinder head of a diesel engine, the pressure sensor is directly installed on the ignition surface, and the existing structure on the cylinder head is generally used for measurement. It is common practice to mount the sensor on the explosion detection valve. Since the explosion detection valve port is connected with the wall of the combustion chamber by a passage, the sensor cannot be installed flush with the cylinder head, but the pressure in the cylinder is measured through the pressure measurement passage. The high-pressure gas is introduced into the n...

AI Technical Summary

Problems solved by technology

The compression line method is relatively simple to measure, and the accuracy is higher than that of the capacitive sensor. However, due to the channel effect and the elastic connection between the angle marker and the diesel engine, the compression top dead center of the diesel engine is not the same under different working conditions, so this method It is also difficult to eliminate the errors caused by the above two points

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