A novel microwave-based approach for monitoring the state of aftertreatment systems such as diesel particulate filters (DPFs), three-way catalytic converters (TWCs), and selective catalytic reduction (SCR) catalysts is proposed. The volume inside the metallic housing of the DPF, TWC, or SCR is considered as a wireless communication channel between two terminals of a communication system. It is ...

Materials which catalyse the reduction of gas phase nitrogen oxides (NOx), from combustion devices such as diesel engines, are needed to meet emissions regulations and improve air quality. Here we use flow tube engine laboratory systems investigate an iron silicate material (LowCat) catalyses CO oxidation NOx simultaneously is effective at low temperatures. LowCat’s potential for mitigation was...

The Lean NOx Trap (LNT) is an aftertreatment device used to attain a reduction in nitrogen oxide emissions for Diesel and lean burn engines. The LNT is typically used as a storage device, capturing NOx during lean engine operation. The trap can be regenerated by controlling the exhaust air-fuel ratio to create a rich gas mixture. Under rich conditions, the stored NOx is released and catalytical...

Strict environmental regulations on air quality coupled with a consumer desire for more efficient engines has forced the automotive industry to start developing more advanced emissions aftertreatment technologies. Of the common diesel exhaust treatment methods for NOx removal, Lean NOx Traps (LNT) have been recognized as the most practical for use in small displacement engines. The current stat...

Aftertreatment technologies in Tier 4 off-road engines have resulted significant emission reductions compared to older tier without aftertreatments. The appropriate characterization of engine emissions consideration aftertreatment operation is important for projecting and developing mitigation strategies. current method aggregating over an entire duty cycle averaging them by load has a limitati...