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Evolution of Lean-NOx Traps on PFI and DISI Lean Burn Vehicles
ISSN: 0148-7191, e-ISSN: 2688-3627
Published October 25, 1999 by SAE International in United States
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This paper charts the development of three three-way catalyst (TWC) and four lean-NOx trap (LNT) formulations in four vehicle systems over a four-year period. All LNTs were installed in an underbody location behind a close-coupled TWC on vehicles equipped with either port fuel injection (PFI) or direct injection spark ignition (DISI) engines. In addition to the standard regulatory European drive cycles, a series of steady-state tests were conducted to determine changes in LNT NOx efficiency with increasing NOx storage, and changes in the levels of individual nitrogen-containing exhaust components. Each vehicle system was subjected to a durability cycle up to an equivalent of 80,000 km. The early LNT formulations on systems ‘1’ and ‘2’ suffered from inadequate thermal durability with system efficiencies for NOx deteriorating to ≤ 55% after vehicle aging under lean operating drive cycle conditions (from ≥ 80% when fresh). As a result, improvements were made to the LNT formulations on systems ‘3’ and ‘4’. Only minor deterioration in lean NOx performance was observed after vehicle aging on these systems (≥ 90% NOx efficiency after aging). These improvements have been such that ECE Stage III and IV NOx emission targets have been achieved after aging with PFI and DISI lean-burn gasoline technology, respectively.
- D. Gregory - Dunton Engineering Centre, Ford Motor Company Ltd.
- R. A. Marshall - Dunton Engineering Centre, Ford Motor Company Ltd.
- B. Eves - Dunton Engineering Centre, Ford Motor Company Ltd.
- M. Dearth - Research Laboratory, Ford Motor Company.
- J. Hepburn - Research Laboratory, Ford Motor Company.
- M. Brogan - Johnson Matthey Catalytic Systems Division
- D. Swallow - Johnson Matthey Catalytic Systems Division
CitationGregory, D., Marshall, R., Eves, B., Dearth, M. et al., "Evolution of Lean-NOx Traps on PFI and DISI Lean Burn Vehicles," SAE Technical Paper 1999-01-3498, 1999, https://doi.org/10.4271/1999-01-3498.
SAE 1999 Transactions - Journal of Fuels and Lubricants
Number: V108-4; Published: 2000-09-15
Number: V108-4; Published: 2000-09-15
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