US 12,421,881 B2
System and method for reducing internal combustion engine emissions
Emmanuel Laigle, Courbevoie (FR); Christophe Chaillou, Rueil-Malmaison (FR); and Caroline Norsic, Rueil-Malmaison (FR)
Assigned to SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed by SAUDI ARABIAN OIL COMPANY, Dhahran (SA)
Filed on May 26, 2023, as Appl. No. 18/324,764.
Prior Publication US 2024/0392711 A1, Nov. 28, 2024
Int. Cl. F01N 3/031 (2006.01); F01N 9/00 (2006.01)
CPC F01N 3/031 (2013.01) [F01N 9/002 (2013.01); F01N 2240/38 (2013.01); F01N 2900/08 (2013.01)] 11 Claims
OG exemplary drawing
 
1. A system for reducing internal combustion engine emissions, comprising:
an exhaust line for feeding an exhaust from an internal combustion engine to a catalytic converter and a particulate filter producing a filtered exhaust;
a filter effluent line for feeding the filtered exhaust to a tailpipe;
a bypass filtration system comprising a bypass inlet configured for receiving filtered exhaust from the filter effluent line, a bypass filter for further filtering the filtered exhaust to produce a bypass filtered stream, and a bypass filter effluent line connected to the filter effluent line, the bypass filter effluent line configured to return the bypass filtered stream to the filter effluent line upstream of the tailpipe;
an ozone generator configured to generate ozone;
a flow line for feeding the ozone to the bypass filtration system downstream of the bypass inlet and upstream of the bypass filter when the bypass filter has a temperature of −40 to 220° C.; and
a control system configured to control an operation of a bypass inlet valve system, the ozone generator, or both,
wherein the bypass inlet valve system is configured for diverting the filtered exhaust from the filter effluent line into the bypass filtration system, and
wherein:
a bypass filter porosity is smaller than a particulate filter porosity, and
a bypass filter pore size is smaller than a particulate filter pore size.