|Table of Contents|

Fault simulation test of oxygen sensor for natural gas engine(PDF)

《交通运输工程学报》[ISSN:1671-1637/CN:61-1369/U]

Issue:
2013年03期
Page:
62-70
Research Field:
载运工具运用工程
Publishing date:

Info

Title:
Fault simulation test of oxygen sensor for natural gas engine
Author(s):
DONG Qiang-zhu1; 2;  YUAN Hua-zhi2;  JIAN Xiao-ping2;  LI Yang-yang2;  JIAO Sheng-jie1
1. National Engineering Laboratory of Highway Maitenance Equipment, Chang'an University, Xi'an 710064, Shaanxi, China; 2. School of Automobile, Chang'an University, Xi'an 710064, Shaanxi, China
Keywords:
automobile engineering;  natural gas engine;  oxygen sensor;  fault simulation;  signal loss;  signal anomaly
PACS:
U467.2
DOI:
-
Abstract:
On the self-built engine test bench, the bench test and emission analysis method were taken as foundations, the NI acquisition card, front-end signal processing circuit, the control circuit of signal loss and the control circuit of signal anomaly were taken as hardwares, the fault simulation system of oxygen sensor for natural gas engine was designed by LabVIEW software, and the influences of oxygen sensor fault on the power performance, economy performance and emission indexes of natural gas engine were analyzed. Test result shows that when rotation speed is 2 500 r·min-1, throttle opening degree is 25% and analog signal voltage is below 0.5 V, the excess air coefficient reduces, the concentration of mixed gas rises, torque changes slightly compared with normal value, CO emission rises, HC emission rises slightly, and NOx emission decreases. When signal voltage is high above 0.5 V, the excess air coefficient rises, the concentration of mixed gas decreases, torque drops significantly, CO emission decreases and is less than normal value, HC emission increases, and NOx is 0 basically. 2 tabs, 26 figs, 21 refs.

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Last Update: 2013-07-30