Automatic Correction Method of Blow By Measurement on Diesel Engine Bench

LIU Jie; CHEN Chuang; XIE Jun; DONG Hongxia; WANG Yu; LI Chuang

doi:10.3969/j.issn.1001-2222.2024.03.014

Vehicle Engine ›› 2024, Vol. 0 ›› Issue (3) : 88-92. DOI: 10.3969/j.issn.1001-2222.2024.03.014

Automatic Correction Method of Blow By Measurement on Diesel Engine Bench

LIU Jie¹，CHEN Chuang¹，XIE Jun¹，DONG Hongxia²，WANG Yu¹，LI Chuang¹

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Abstract

During the development and testing stage of diesel engine, the matching performance of piston, piston ring and cylinder was usually evaluated by the blow-by. By studying the measurement mechanism of AVL442 blow-by meter, it was found that there was significant difference between the actual temperature and pressure and the reference ones achieved by blow-by meter measurement, which would affect the accurate measurement of blow-by to a certain extent. Automatic correction method of blow-by measurement was hence put forward. The temperature and pressure of blow-by gas were measured before passing through the meter, then blow-by correction algorithm was configured based on the LAM acquisition and formula editing of bench data acquisition system, and the automatic correction was hence conducted during the measurement of blow-by. Accordingly, the correlation between the bench and test equipment was improved, and the accuracy of blow-by measurement was also improved.

Key words

blow-by / blow-by meter / temperature measurement / pressure measurement / correction

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LIU Jie，CHEN Chuang，XIE Jun，DONG Hongxia，WANG Yu，LI Chuang. Automatic Correction Method of Blow By Measurement on Diesel Engine Bench[J]. Vehicle Engine. 2024, 0(3): 88-92 https://doi.org/10.3969/j.issn.1001-2222.2024.03.014