Detection of Urea Injection System Faults for SCR Systems

Sun, Yuwen; Wang, Yue-Yun; Chang, Chen-Fang; Levijoki, Stephen

doi:10.4271/2012-01-0431

Cited by 9 publications

(2 citation statements)

References 7 publications

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“…Various studies have been carried out regarding the detection and correction of under-dosing or over-dosing problems in urea injection. 29,30 In addition, several research studies have focused on optimum control of the NH 3 storage on SCR catalysts. [31][32][33] It is well known that the deNO x efficiency and the NH 3 slip out of the SCR catalyst are dependent on the amount of NH 3 stored on the catalyst.…”

Section: Introductionmentioning

confidence: 99%

Simulation study on improving the selective catalytic reduction efficiency by using the temperature rise in a non-road transient cycle

Wang¹,

Kim²,

Ahn³

2016

Proceedings of the Institution of Mechanical Engineers, Part D:

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In this study, the transient nitrogen oxide reduction performance of a urea selective catalytic reduction system installed on a non-road diesel engine was tested on an engine dynamometer bench over a scheduled non-road transient cycle mode. Based on the measurement results, the characteristics of the transient selective catalytic reduction behaviours of nitrogen oxide reduction were evaluated. Also, in this study, the effects of several thermal management strategies for improving the selective catalytic reduction efficiency was investigated by transient selective catalytic reduction simulations. The kinetic parameters of the current simulation code for selective catalytic reduction were calibrated and validated by comparison with the measurement data. As a result of this study, it was found that a thermal management strategy utilizing a partial temperature rise in the transient time domain can be an efficient approach for improving the transient selective catalytic reduction efficiency, in comparison with the temperature rise over the entire cycle period. Furthermore, this study can provide some guideline data for the magnitude and the duration of the temperature rise required to obtain the target selective catalytic reduction efficiency over the non-road transient cycle mode. In the last part of this study, the impact of the variation in the space velocity on the transient selective catalytic reduction efficiency was assessed using transient selective catalytic reduction simulations.

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Section: Introductionmentioning

confidence: 99%

Simulation study on improving the selective catalytic reduction efficiency by using the temperature rise in a non-road transient cycle

Wang¹,

Kim²,

Ahn³

2016

Proceedings of the Institution of Mechanical Engineers, Part D:

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show abstract

“…The methodology was based on the estimation of the injected urea flow by a linear parameter varying (LPV) model, which presented good performances in vehicle tests. Sun et al [20] found a relationship between injector pulse amplitude modulated (PAM) commands and line pressures in their study, and a fault diagnosis algorithm was proposed based on power spectrum and time domain analysis. The diagnostic method was verified in a urea SCR system, which was shown to be effective.…”

Section: Introductionmentioning

confidence: 99%

Model-Based Temperature Sensor Fault Detection and Fault-Tolerant Control of Urea-Selective Catalyst Reduction Control Systems

Wang

Zeng

et al. 2018

Energies

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This paper aims at investigating the fault diagnosis of the selective catalyst reduction (SCR) outlet temperature sensors and fault-tolerant control methods of the SCR system, and three typical faults of downstream temperature sensors were modeled and analyzed to present influences of different faults on the SCR system performances (such as nitrogen oxides (NO x ) emission and conversion efficiency, NH 3 slip, urea dosage and ammonia coverage estimation). A temperature model was established to estimate the SCR outlet temperature, and diagnostics were developed based on the differences between model estimates and sensor measurements. Once a downstream temperature sensor fault was detected, the fault-tolerant control will be enabled, and the output of the sensor may be substituted with the estimates of the model. Thus, SCR performances shall be maintained within the acceptable ranges. Moreover, a 0-D SCR model was also established to validate the capability of diagnostics and fault-tolerant control strategy over the European transient cycle (ETC).

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Simultaneous estimation of ammonia injection rate and state of diesel urea-SCR system based on high gain observer

Zhang

Sun

et al. 2022

ISA Transactions

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Detection of Urea Injection System Faults for SCR Systems

Cited by 9 publications

References 7 publications

Simulation study on improving the selective catalytic reduction efficiency by using the temperature rise in a non-road transient cycle

Simulation study on improving the selective catalytic reduction efficiency by using the temperature rise in a non-road transient cycle

Model-Based Temperature Sensor Fault Detection and Fault-Tolerant Control of Urea-Selective Catalyst Reduction Control Systems

Simultaneous estimation of ammonia injection rate and state of diesel urea-SCR system based on high gain observer

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