Onboard Emissions Monitoring on a HD Truck with an SCR System Using Nox Sensors

Hofmann, Lothar; Rusch, Klaus; Fischer, Stefan; Lemire, Bertrand

doi:10.4271/2004-01-1290

Cited by 31 publications

(12 citation statements)

References 8 publications

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“…On the one hand, the existing pronounced NH 3 cross-sensitivity of the planar zirconia-based amperometric NO x sensor as described in Ref. [11] can be used to detect the ammonia concentration in the exhaust [12], e.g., by implementing a cross-sensitivity factor [13]. This behavior can be easily understood if one considers that at the high sensor operation temperatures a part of the ammonia gets oxidized according to…”

Section: Introductionmentioning

confidence: 98%

Selective mixed potential ammonia exhaust gas sensor

Schönauer

Wiesner

Fleischer

et al. 2009

Sensors and Actuators B: Chemical

111

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Section: Introductionmentioning

confidence: 98%

Selective mixed potential ammonia exhaust gas sensor

Schönauer

Wiesner

Fleischer

et al. 2009

Sensors and Actuators B: Chemical

111

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“…The Kalman filter as an efficient recursive filter can estimate the state of a linear dynamic system from a series of measurement noise [15]. It can also be successfully applied in state estimation of continuous-time nonlinear system after its discretization.…”

Section: Nonlinear State Observer Of Scr Catalytic Convertermentioning

confidence: 99%

Model-based urea injection control strategy and ammonia storage estimation for diesel engine SCR system

Liu

Zhu

et al. 2015

The 27th Chinese Control and Decision Conference (2015 CCDC)

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The selective catalytic reduction (SCR) technology is one of the most effective approaches of reducing the diesel engine exhaust emissions. A brief introduction to the features of the diesel exhaust aftertreatment system is given , then the ammonia storage characteristics of SCR catalyst is studied based on the nonlinear continuous-time model for SCR system. A closed-loop control system of urea measurement and injection is proposed. The state observer based on the extended Kalman filter (EKF) and closed-loop controller is designed. SCR test bench is set up for the experimental validation of the control strategy. The experimental results show that the closed-loop control system is satisfying for the diesel engine exhaust aftertreatment SCR system. It also can effectively reduce the diesel nitrogen oxide emissions and avoid the secondary pollution caused by the ammonia leakage.

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“…It shows only very small cross-sensitivities to components that are usually present in the exhaust (CO 2 , O 2 , CO, HC, H 2 , SO 2 ) [10]. The remaining cross-sensitivity for ammonia can be used for SCR purposes (see below) [12]. Due to its two pumping chambers and the electronic circuitry to deal with very small currents, the sensor is relatively complex and costly.…”

Section: No X Sensorsmentioning

confidence: 99%

New Approaches for Exhaust Gas Sensing

Moos

2011

Springer Series on Chemical Sensors and Biosensors

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Steadily increasing emission standards for passenger cars and heavy duty vehicles combined with the need for fuel efficiency lead to novel powertrain concepts, for example to leanly operated gasoline direct injection engines, or to novel exhaust gas aftertreatment concepts such as Lean NO x Traps (LNT), ammonia selective catalytic reduction catalysts for NO x reduction (SCR), or even to a combination of both. Also, diesel particulate filters (DPF) are in series production.To control these novel exhaust gas aftertreatment systems and to monitor onboard the proper operation of these systems (on-board diagnosis, OBD), novel exhaust gas sensors are required or are at least be very helpful. Since the development of exhaust gas sensors has always to be seen in interaction with the corresponding exhaust gas aftertreatment systems, novel types of exhaust gas sensors have gained in importance just recently, when the time was ripe for novel exhaust gas aftertreatment concepts. This article reports on several types of NO x sensors and ammonia sensors.Additionally, a very recent novel concept is presented. Here, the catalyst itself works as a sensing device that gives directly information on its own status. The readout can be wirebound (demonstrated for LNT and SCR) or even be wireless by applying radio frequency techniques. It will be shown that this allows to detect the oxygen loading degree of three-way catalysts very precisely. It can be also applied to determine the ammonia loading of SCR catalysts and the soot loading of DPF.As a conclusion, these novel methods may provide a future alternative for low emission-aiming engine control as well as for OBD of low emission vehicles with novel exhaust gas aftertreatment systems. However, it is clear that all novel sensors or systems do not only have to meet the technical requirements but also have to be very inexpensive, reliable, and cost effective.R. Moos (*)

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Onboard Emissions Monitoring on a HD Truck with an SCR System Using Nox Sensors

Cited by 31 publications

References 8 publications

Selective mixed potential ammonia exhaust gas sensor

Selective mixed potential ammonia exhaust gas sensor

Model-based urea injection control strategy and ammonia storage estimation for diesel engine SCR system

New Approaches for Exhaust Gas Sensing

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