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Control of a Combined SCR on Filter and Under-Floor SCR System for Low Emission Passenger Cars
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Control of a Combined SCR on Filter and Under-Floor SCR System for Low Emission Passenger Cars
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Journal Article
Control of a Combined SCR on Filter and Under-Floor SCR System for Low Emission Passenger Cars
2014
Overview
Similar to single-brick SCR architectures, the multi-brick SCR systems described in this paper require urea injection control software that meets the NOₓ conversion performance target while maintaining the tailpipe NH₃ slip below a given threshold, under all driving conditions.
The SCR architectures containing a close-coupled SCRoF and underfloor SCR are temperature-wise more favorable than the under-floor location and lead to significant improvement of the global NOₓ conversion, compared to a single-brick system. But in order to maximize the benefit of close-coupling, the urea injection control must maximize the NH₃ stored in the SCRoF.
The under-floor SCR catalyst can be used as an NH₃ slip buffer, lowering the risk of NH₃ slip at the tailpipe with some benefit on the global NOₓ conversion of the system. With this approach, the urea injection strategy has a limited control on the NH₃ coverage of the under-floor SCR catalyst.
To take more advantage of the under-floor SCR catalyst for improving the NOₓ conversion, the NH₃ coverage of the under-floor SCR must be taken into account, and therefore a combined control of both catalysts is required. This paper presents a control strategy proposal for such multi-brick SCR systems: the NH₃ coverage of the SCRoF is optimized while taking into account the current states of front and rear SCR catalysts. The strategy focuses on achieving highest NOₓ conversion efficiency while preventing excessive tailpipe NH₃ slip, even in the worst driving conditions, such as sudden full-load acceleration.
Publisher
SAE International,SAE International, a Pennsylvania Not-for Profit
