柴油机在研发试验阶段都会通过活塞漏气量来评价活塞、活塞环和缸体的设计质量。通过研究AVL442活塞漏气仪测量机理，发现在台架漏气量的实际测量中，漏出气体的温度、压力与漏气仪测量的参考温度、压力有明显差别，会在一定程度上影响漏气量测量。为此提出一种漏气量测量自动修正方法，在漏出气体进入漏气仪前测量其温度和压力，并基于台架数据采集系统的Calculation、LAM模块配置漏气量修正计算，在漏气量采集过程中自动修正测量值，从而提高台架漏气量测量准确度，提升台架与测试设备的关联分析能力。
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.
