US Patent No. 9,267,409

REVERSE FLOW HYDROCARBON TRAP


Patent No. 9,267,409
Issue Date February 23, 2016
Title Reverse Flow Hydrocarbon Trap
Inventorship Gang Guo, Ann Arbor, MI (US)
Giovanni Cavataio, Dearborn, MI (US)
Lifeng Xu, Northville, MI (US)
Manish Sharma, Inkster, MI (US)
Jeffrey Scott Hepburn, Birmingham, MI (US)
Assignee Ford Global Technologies, LLC, Dearborn, MI (US)

Claim of US Patent No. 9,267,409

1. A hydrocarbon trap for reducing cold start vehicle emissions comprising:
a substrate having at least one exhaust gas passage therethrough, the walls of said exhaust gas passage including a hydrocarbon
trapping material and an oxidative catalyst thereon;

said substrate including an inlet for hot exhaust gas from a vehicle engine and an outlet for said exhaust gas;
said exhaust gas passage further including an inlet channel having first and second ends, said first end of said inlet channel
communicating with said exhaust gas inlet, an outlet channel having first and second ends, said second end of said outlet
channel communicating with said exhaust gas outlet, and

an intermediate channel having first and second ends, said first end of said intermediate channel communicating with said
second end of said inlet channel and said second end of said intermediate channel communicating with said first end of said
outlet channel, wherein said intermediate channel is oriented such that the flow of exhaust gas through said at least one
exhaust gas passage is reversed from the direction of flow in said inlet and outlet channels.