scr closed loop ammonia sensors

Ammonia sensor for closed-loop SCR control | TNO Publications

Selective Catalytic Reduction (SCR) is the dominant solution for meeting future NOx reduction regulations for heavy-duty diesel powertrains. SCR systems benefit from closed-loop control if an appropriate exhaust gas sensor were available. An ammonia sensor has recently been developed for use as a feedback element in closed-loop control of urea dosing in a diesel SCR aftertreatment system.

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SCR Systems: Delphi SCR ammonia (NH3) sensor technology ...

· The ammonia sensor is the first technology that enables an SCR system to have a direct closed loop control system; allowing the optimisation of the urea dosage to be controlled by measurement of the emissions. Future innovation and design SCR systems have been developed and improved upon very quickly since the EU implemented their emissions strategy and the standards for …

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Ammonia Cross-Sensitivity Eliminatin Method of NOx Sensor ...

Abstract: This paper reports an ammonia cross-sensitivity elimination filter for SCR systems. Since NO X sensors are cross sensitive to NH 3, a reading of NO X sensor could not be accurate. As the reading is inaccurate, the closed-loop SCR systems is unpredictable. The proposed filter can be applied to any kinds of NO X sensors and effectively remove the cross-sensitivity.

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Ammonia sensor for closed-loop SCR control — Technische ...

Closed-loop control of SCR dosing enables the SCR system to be robust against disturbances and to meet conformity of production (COP) and in-use compliance norms. The ammonia sensor is based on a non-equilibrium electrochemical principle and outputs emf signals. The sensor performs well when tested in a diesel engine exhaust environment and has ...

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Model Based Control of SCR Dosing and OBD Strategies with ...

SCR chemistry model and a NH3 sensor. The control algorithm consists of a number of control features designed to enhance ammonia storage control and closed-loop compensation using the mid-brick NH3 sensor. An adaptive control algorithm is developed to demonstrate robustness of the feedback control system to compensate for catalyst aging, urea injection malfunction, or dosing fluid ...

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Number : 2008-01-0919 Ammonia Sensor for Closed-Loop SCR ...

Selective Catalytic Reduction (SCR) is the dominant solution for meeting future NOx reduction regulations for heavy-duty diesel powertrains. SCR systems benefit from closed-loop control if an appropriate exhaust gas sensor were available. An ammonia sensor has recently been developed for use as a feedback element in closed-loop control of urea dosing in a diesel SCR aftertreatment system.

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Selective ammonia exhaust gas sensor for automotive ...

· Such a closed control loop system offers the chance to reduce both weight and cost of the SCR system. In addition, the ammonia sensor offers a convenient method for reliable on board diagnosis (OBD) of the ammonia dosing system. Several attempts for the detection of ammonia have been proposed in the literature. Sensors based on functional films of organic materials (examples in , …

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Ammonia Sensor for Closed-Loop SCR Control

· Ammonia Sensor for Closed-Loop SCR Control 2008-01-0919 Selective Catalytic Reduction (SCR) is the dominant solution for meeting future NO x reduction regulations for heavy-duty diesel powertrains. SCR systems benefit from closed-loop control if an appropriate exhaust gas sensor …

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[PDF] Ammonia sensor for closed-loop SCR control ...

Selective Catalytic Reduction (SCR) is the dominant solution for meeting future NOx reduction regulations for heavy-duty diesel powertrains. SCR systems benefit from closed-loop control if an appropriate exhaust gas sensor were available. An ammonia sensor has recently been developed for use as a feedback element in closed-loop control of urea dosing in a diesel SCR aftertreatment system.

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Ammonia Sensor for Closed-Loop SCR Control

Closed-loop control of SCR dosing enables the SCR system to be robust against disturbances and to meet conformity of production (COP) and in-use compliance norms. The ammonia sensor is based on a non-equilibrium electrochemical principle and outputs emf signals. The sensor performs well when tested in a diesel engine exhaust environment and has ...

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SCR CLOSED LOOP CONTROL SYSTEM - VOLVO LASTVAGNAR AB

SCR CLOSED LOOP CONTROL SYSTEM. Document Type and Number: WIPO Patent Application WO/2010/068147 . Kind Code: A1 . Abstract: The invention relates to a method for an exhaust after treatment system (10) of an engine (12) comprising at least one selective catalyst reaction (SCR) (70) at least one clean up catalyst (80) downstream said SCR (70), an urea injector (62) upstream said SCR …

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Ammonia sensor for closed-loop SCR control | TU Delft ...

SCR systems benefit from closed-loop control if an appropriate exhaust gas sensor were available. An ammonia sensor has recently been developed for use as a feedback element in closed-loop control of urea dosing in a diesel SCR aftertreatment system. Closed-loop control of SCR dosing enables the SCR system to be robust against disturbances and to meet conformity of production (COP) and in-use ...

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1 06 01-18

Selective Catalyst Reduction Closed Loop Control at Maximum Limit (Multiples Sources) Table 1. SPN 520371/FMI 16 Description The Fault Indicates High DEF Delivery Monitored Parameter NOx Conversion Efficiency Typical Enabling Conditions Closed Loop DEF Dosing Monitor Sequence None Execution Frequency Always Enabled Typical Duration Two Seconds Dash Lamps None Engine Reaction None …

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Experimental closed-loop control of SCR aftertreatment ...

· Experimental closed-loop control of SCR aftertreatment systems using NOx sensors cross-sensitive to NH3. Automatic Control Engineering. Ecole Nationale Supérieure des Mines de Paris, 2013. English. ￿NNT: 2013ENMP0097￿. ￿tel-01139394￿ T H È S E INSTITUT DES SCIENCES ET TECHNOLOGIES ÉcoledoctoralenO432:SciencesdesMétiersdel’Ingénieur DoctoratParisTech PhD …

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Ammonia Sensor for Closed-Loop SCR Control

Closed-loop control of SCR dosing enables the SCR system to be robust against disturbances and to meet conformity of production (COP) and in-use compliance norms. The ammonia sensor is based on a non-equilibrium electrochemical principle and outputs emf signals. The sensor performs well when tested in a diesel engine exhaust environment and has minimum cross interference with CO, HC, NO, NO2 ...

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Ammonia sensor for closed-loop SCR control — Technische ...

An ammonia sensor has recently been developed for use as a feedback element in closed-loop control of urea dosing in a diesel SCR aftertreatment system. Closed-loop control of SCR dosing enables the SCR system to be robust against disturbances and to meet conformity of production (COP) and in-use compliance norms. The ammonia sensor is based on a non-equilibrium electrochemical principle and ...

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