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 having an intake, an exhaust, and a hydrocarbon-retaining system, the engine combusting fuel, the method comprising:
- during engine starting:
- selectively routing exhaust gases of the engine to the hydrocarbon retaining system to store exhaust hydrocarbons and operating with spark advance close to a peak torque timing;
- and
- selectively purging stored hydrocarbons from the hydrocarbon retaining system to the engine 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:
- during an engine start when catalytic emission control device is below a light-off temperature:
- in a first mode, routing exhaust gases to the hydrocarbon retaining system and operating during at least a portion of first mode with spark at first timing, and a first exhaust air-fuel ratio;
- in a second mode, 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 first timing or a second exhaust air-fuel ratio leaner than the first exhaust air-fuel ratio.
A method of operating an engine having an intake, an exhaust, and a hydrocarbon-retaining system, the engine combusting fuel, the method comprising:
- during engine starting:
- selectively routing exhaust gases of the engine to the hydrocarbon retaining system to store exhaust hydrocarbons and operating with exhaust air-fuel ratio slightly rich;
- and
- selectively purging stored hydrocarbons from the hydrocarbon retaining system to the engine intake.
Dependencies are inferred from the claim text.