天然气发动机氧传感器故障模拟试验

董强柱; 袁华智; 蹇小平; 李阳阳; 焦生杰

doi:10.19818/j.cnki.1671-1637.2013.03.009

天然气发动机氧传感器故障模拟试验

doi: 10.19818/j.cnki.1671-1637.2013.03.009

1.
长安大学公路养护装备国家工程实验室, 陕西西安 710064
2.
长安大学汽车学院, 陕西西安 710064

基金项目:

国家自然科学基金项目 51178158

陕西省交通科技项目 07-19K

详细信息

作者简介:
董强柱(1980-), 陕西户县人, 长安大学工学博士研究生, 从事机械工程研究

焦生杰(1955-), 陕西富平人, 长安大学教授, 工学博士

中图分类号: U467.2
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- 被引次数: 0
出版历程
- 收稿日期: 2012-12-18
- 刊出日期: 2013-06-25

Fault simulation test of oxygen sensor for natural gas engine

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

More Information

Author Bio:
DONG Qiang-zhu(1980-), male, doctoral student, +86-29-82339971, dqz@chd.edu.cn

JIAO Sheng-jie(1955-), male, professor, PhD, +86-29-82334496, jsj@chd.edu.cn

摘要

摘要: 在自行搭建的发动机试验台架上, 以台架试验与排放分析法为基础, 以NI采集卡、前端信号处理电路、信号丢失控制电路与信号异常控制电路等为硬件, 以LabVIEW软件为技术支持设计了天然气发动机氧传感器故障模拟系统, 分析了天然气发动机氧传感器故障对发动机动力性、经济性以及各项排放指标的影响。试验结果表明: 当转速为2 500 r.min^-1, 节气门开度为25%, 模拟信号电压低于0.5 V时, 过量空气系数变小, 混合气变浓, 转矩与正常值相比变化不大, CO排放上升, HC排放略有升高, 但变化不大, NO_x排放下降; 当模拟信号电压高于0.5 V时, 过量空气系数变大, 混合气变稀, 转矩下降较大, CO排放下降, 并低于正常值, HC排放上升, NO_x排放基本为0。
- 汽车工程 /
- 天然气发动机 /
- 氧传感器 /
- 故障模拟 /
- 信号丢失 /
- 信号异常
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 NO_x 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 NO_x is 0 basically.
- automobile engineering /
- natural gas engine /
- oxygen sensor /
- fault simulation /
- signal loss /
- signal anomaly

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图 1 试验台架

Figure 1. Test bench

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图 2 故障模拟系统

Figure 2. Fault simulation system

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图 3 低通滤波电路

Figure 3. Low-pass filter circuit

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图 4 运行流程

Figure 4. Operation process

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图 5 信号丢失控制电路

Figure 5. Control circuit of signal loss

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图 6 信号丢失控制程序

Figure 6. Control program of signal loss

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图 7 信号异常控制电路

Figure 7. Control circuit of signal anomaly

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图 8 信号异常控制程序

Figure 8. Control program of signal anomaly

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图 9 外特性曲线下的过量空气系数

Figure 9. Excess air coefficients under external characteristic curve

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图 10 外特性曲线下的气耗量

Figure 10. Air consumptions under external characteristic curve

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图 11 外特性曲线下的转矩和功率

Figure 11. Torques and powers under external characteristic curve

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图 12 负荷特性曲线下的过量空气系数

Figure 12. Excess air coefficients under load characteristic curve

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图 13 负荷特性曲线下的气耗量

Figure 13. Air consumptions under load characteristic curve

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图 14 负荷特性曲线下的比气耗

Figure 14. Specific gas consumptions under load characteristic curve

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图 15 信号丢失对CO排放的影响

Figure 15. Influence of signal loss on CO emissions

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图 16 信号丢失对HC排放的影响

Figure 16. Influence of signal loss on HC emissions

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图 17 信号丢失对NO_x排放的影响

Figure 17. Influence of signal loss on NO_x emissions

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图 18 怠速工况下信号异常对过量空气系数的影响

Figure 18. Influence of signal anomaly on excess air coefficient under idle condition

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图 19 怠速工况下信号异常对CO排放的影响

Figure 19. Influence of signal anomaly on CO emission under idle condition

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图 20 怠速工况下信号异常对HC排放的影响

Figure 20. Influence of signal anomaly on HC emission under idle condition

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图 21 怠速工况下信号异常对NO_x排放的影响

Figure 21. Influence of signal anomaly on NO_x emission under idle condition

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图 22 中等负荷工况下信号异常对过量空气系数的影响

Figure 22. Influence of signal anomaly on excess air coefficient under medium-load condition

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图 23 中等负荷工况下信号异常对转矩的影响

Figure 23. Influence of signal anomaly on torque under medium-load condition

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图 24 中等负荷工况下信号异常对CO排放的影响

Figure 24. Influence of signal anomaly on CO emission under medium-load condition

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图 25 中等负荷工况下信号异常对HC排放的影响

Figure 25. Influence of signal anomaly on HC emission under medium-load condition

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图 26 中等负荷工况下信号异常对NO_x排放的影响

Figure 26. Influence of signal anomaly on NO_x emission under medium-load condition

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表 1 发动机技术参数

Table 1. Technical parameters of engine

表 2 信号丢失对怠速工况的影响

Table 2. Influence of signal loss on idle condition

状态	转速/(r·min^-1)	喷气脉宽/ms	过量空气系数	CO排放/%	HC排放/10^-6	NO_x排放/10^-6
正常	780	5.2	1.114	0.26	60	8
丢失	731	4.9	1.212	0.08	146	3

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