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Diesel engine indicator diagram measuring method

A measurement method and diesel engine technology, applied in power metering, measuring devices, internal combustion engine testing, etc., can solve problems such as inaccurate data, and achieve the effect of avoiding error factors and improving accuracy

Inactive Publication Date: 2013-10-30
CRRC DALIAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it can be seen from Table 1 that the angle of the maximum pressure value drifts too much, with a difference of about 11°, which shows that the measured data is inaccurate

Method used

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  • Diesel engine indicator diagram measuring method
  • Diesel engine indicator diagram measuring method
  • Diesel engine indicator diagram measuring method

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Experimental program
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Embodiment Construction

[0019] Since the lower the speed of the diesel engine, the closer the calibrated top dead center is to the actual physical top dead center of the diesel engine, therefore, the top dead center of the diesel engine can be calibrated approximately at the idle speed of the diesel engine. However, although the angular drift of the maximum pressure is the smallest at the idle speed, this phenomenon cannot be ignored. Therefore, it is necessary to increase the sensor to measure the physical top dead center of the diesel engine. The method of measuring the physical top dead center is as follows:

[0020] Crank the diesel engine to 0°, at this time, cylinder 1 is at top dead center. Then paste a thin iron sheet with a height of about 15 mm on the timing plate of the diesel engine, and the iron sheet is located in the middle of the sensor contact.

[0021] Both the timing plate and the end of the generator can be pasted with iron sheets, but the timing plate is finally selected because...

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Abstract

The invention discloses a diesel engine indicator diagram measuring method. A crank angle signal generator and a pressure sensor of a combustion analyzer are arranged on a diesel engine for logging, a cylinder pressure sensor is connected at the outer side of an explosion detecting valve, and a crank angle signal instrument is connected at the tail end of a power generator. The method is characterized in that firstly, physical top dead centers are measured under various rotation speeds, and the diesel engine is turned to be in 0 degree; and then a thin iron sheet of 15mm height is pasted on a timing plate of the diesel engine, the iron sheet is positioned in a middle position of a sensor contact, and the sensor is connected with the crank angle signal generator, so that the physical top dead centers under the different rotating speeds can be measured. By using the method of demarcating the physical top dead centers, error factors brought by the cylinder sensor and the crank angle signal instrument can be effectively avoided. In later tests, principles of error generation in the report can be considered completely, the error generation can be reduced to the greatest extent, and the method is suitable for logging of a diesel engine indicator diagram.

Description

technical field [0001] The invention relates to the technical field of diesel engines. Background technique [0002] Measuring the cylinder pressure of an internal combustion engine is one of the basic means for experimental research on an internal combustion engine. From the indicator diagram, we can observe the different stages of the working cycle of the internal combustion engine (compression, combustion, expansion) and the pressure changes in the intake and exhaust strokes. Through data processing and the use of thermodynamic knowledge, we can further digest and absorb the performance of diesel engines. Computational analysis provides the basis. [0003] When measuring, the angle marker of the combustion analyzer and the cylinder pressure sensor are installed on the diesel engine. The angle marker is used to measure the relative change of the diesel engine’s rotation angle and time, and the cylinder pressure sensor is used to measure the relationship between the pressu...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01L23/00G01L3/24G01M15/08
Inventor 刘骞张健
Owner CRRC DALIAN CO LTD
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