NO_x传感器布置位置对测量准确度影响的试验研究

甄雷，刘帅，朱兴军，邵宏鑫

潍柴动力股份有限公司，山东 潍坊  261061

摘要：为提高NO_x传感器的测量准确性，采用不同工况的正交试验和排气均匀性仿真建模，分析不同布置位置下NO_x传感器的测量偏差及原因，研究不同位置下的NO_x传感器的测量准确度。结果表明：NO_x传感器应布置在混合气流较均匀的位置且在涡后自氧化催化器前至尾管后的排气管路上；沿尾管随气流方向越靠后的位置，测量准确度越高；气流分布不均匀是影响NO_x传感器测量准确度的主要因素。

关键词：NO_x传感器；精度；气流均匀性；布置位置；测量准确度

Experimental study on the measurement accuracy influenced by NO_x sensor position

ZHEN Lei, LIU Shuai, ZHU Xingjun, SHAO Hongxin

Weichai Power Co., Ltd.,Weifang 261061,China

Abstract：To improve the measurement accuracy of NO_x sensors, the accuracy of NO_x sensors in different locations is studied. Different sensor locations and model using orthogonal test methods and uniformity simulation for different operating conditions are investigated, the measurement deviations and causes at different placement locations are analyzed. The result shows that the NO_x sensor should be placed at a more uniform location of the mixed air flow, and the more accurate the position behind the wind (the tail pipe moves backwards in the direction of the air flow) on the post-turbo to exhaust line. The uneven distribution of air flow is a major factor affecting the accuracy of the NO_x sensor.

Keywords:NO_x sensor; precision; airflow uniformity; installation position; measurement accuracy