Analysis of the Metering Behavior and the Energy Efficiency of a Dosing Pump

Petzold, Martin; Weber, Jürgen; Dautry, Etienne; Ohligschläger, Olaf; Müller, Axel

doi:10.4271/2012-01-2039

Cited by 2 publications

(2 citation statements)

References 6 publications

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“…The metering accuracy is an important index of the AUDS performance, and it is calculated through equations (15)- (17) and (19). The steady-state accuracy is calculated by three measurement results, and the repetitive accuracy and linearity are 10 measurement results.…”

Section: Metering Accuracy Of the Prototypementioning

confidence: 99%

“…Wu et al 18 introduced the design of the UDS in the SCR system with the versatility and openness to meet use requirements and achieve higher metering accuracy, and the test results indicated the design achieves the intended purpose. Petzold et al 19 presented a simulation model with the piston motion and the check valve for elevating the high level of metering accuracy of the UDS, which explained a methodology to locate and reduce potential critical flow areas, such as regions with high flow velocities and low static pressure. Meanwhile, he developed a measurement method for the motion of the piston and valve, which verified the accuracy of the simulation model.…”

Section: Introductionmentioning

confidence: 99%

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Effects of operation conditions and suction pipeline parameters on flow characteristics and metering accuracy for selective catalytic reduction air-assisted urea dosing system

et al. 2019

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Selective catalytic reduction is the main technology to reduce oxides of nitrogen of diesel exhaust. As an important part of the selective catalytic reduction system, the air-assisted urea dosing system regulates the flow rate by adjusting the pump speed, and the flow rate and its metering accuracy directly affect the efficiency of oxides of nitrogen conversion. A mathematical model coupled with the air-assisted urea dosing system and the suction pipeline was built, and the influences of the discharge pressure, pump speed, suction pipeline length, and diameter on the flow characteristics and metering accuracy of the air-assisted urea dosing system were analyzed. The flow rate and metering accuracy of a prototype of the air-assisted urea dosing system were tested under different conditions on a test rig. Results show that the flow stability and metering accuracy of the prototype elevate with increasing the discharge pressure when the prototype has no overfeeding, and it gets down under any discharge pressure when the prototype occurs overfeeding. The flow stability and metering accuracy of the prototype improve with increasing the pump speed, and increase significantly when the suction pipeline length becomes shorter and the diameter gets larger. The metering accuracy of the prototype can achieve to ±2% by optimizing the suction pipeline parameters. The experimental results prove that the proposed mathematical model is effective.

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Section: Metering Accuracy Of the Prototypementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%