Engine starting control for engine with hydrocarbon retaining system
AssigneeFord Global Technologies, LLC
InventorsMichael James Uhrich, Shane Elwart, James Michael Kerns, Jason Aaron Lupescu
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Abstract
Systems, methods, and computer readable storage media are described in which exhaust gas is routed to a hydrocarbon retaining device during starting, and purged to the engine intake manifold. Various alternative approaches are described for controlling operation and diagnosing degradation. Further, various interrelated configurations are described.
Claims16
A method of operating an engine, comprising:
- during engine starting, flowing exhaust gas through a first hydrocarbon trap, storing engine exhaust hydrocarbons in the first hydrocarbon trap, flowing the exhaust gas through a second hydrocarbon trap, and storing engine exhaust hydrocarbons in the second hydrocarbon trap;
- and
- selectively purging stored hydrocarbons from the first and second hydrocarbon traps in parallel to an engine air intake.
A method of operating an engine having an intake, an exhaust and a hydrocarbon retaining system, the engine combusting fuel and the exhaust including a catalytic emission control device, the method comprising:
- in a first mode performed during a first engine start when the catalytic emission control device is below a light-off temperature, routing exhaust gases to the hydrocarbon retaining system and operating during at least a portion of the first mode with spark at a first timing, and a first engine air-fuel ratio;
- and
- in a second mode performed during a second engine start when the catalytic emission control device is below a light-off temperature, bypassing the hydrocarbon retaining system and operating during at least a portion of the second mode with spark at a second timing more retarded than the first timing or a second engine air-fuel ratio leaner than the first engine air-fuel ratio.
A method of operating an engine, comprising:
- selectively serially routing fuel tank gases to two hydrocarbon traps of a hydrocarbon retaining system;
- and
- selectively purging stored hydrocarbons from the two hydrocarbon traps in parallel to an activated charcoal purge canister and an engine air intake, the activated charcoal purge canister including hydrocarbons from fuel tank vapors.
Dependencies are inferred from the claim text.