Patent ID: 7913672

Claim:
A system for a vehicle including an engine having an intake and an exhaust, the system comprising: a fuel system of the vehicle; a hydrocarbon retaining system selectively coupled to the engine intake, engine exhaust, and fuel system; the hydrocarbon retaining system including a first and second hydrocarbon retaining device, the second hydrocarbon retaining device having a smaller porosity than the first hydrocarbon retaining device; and a controller for selectively routing exhaust gases of the engine to the first hydrocarbon retaining device and then to the second hydrocarbon retaining device to store exhaust hydrocarbons; selectively routing fuel vapors from the fuel system to the hydrocarbon retaining system; selectively purging stored hydrocarbons from the hydrocarbon retaining system to the engine intake; and selectively drawing fresh air through the first and second hydrocarbon retaining devices in parallel to purge stored hydrocarbons to the engine intake.