Hydrocarbon retaining and purging system for flex-fuel combustion engine
First Claim
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1. An engine method, comprising:
- selectively routing exhaust gases through a hydrocarbon trap to store exhaust hydrocarbons;
initiating purging stored hydrocarbons from the hydrocarbon trap, through a purge canister, and then to an engine intake responsive to an alcohol content of injected fuel; and
varying termination of the selective routing responsive to the alcohol content of the injected fuel by delaying the termination as the alcohol content increases.
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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.
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Citations
18 Claims
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1. An engine method, comprising:
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selectively routing exhaust gases through a hydrocarbon trap to store exhaust hydrocarbons; initiating purging stored hydrocarbons from the hydrocarbon trap, through a purge canister, and then to an engine intake responsive to an alcohol content of injected fuel; and varying termination of the selective routing responsive to the alcohol content of the injected fuel by delaying the termination as the alcohol content increases. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method, comprising:
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selectively routing engine exhaust gases through a hydrocarbon trap to store exhaust hydrocarbons; adjusting an initiation of purging stored hydrocarbons from the hydrocarbon trap, through a purge canister, and then to an engine intake to higher temperatures as an alcohol content of injected fuel increases; and delaying termination of the selective routing as the alcohol content increases. - View Dependent Claims (14, 15, 16)
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17. A method, comprising:
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selectively routing engine exhaust gases through first and second hydrocarbon traps to store exhaust hydrocarbons; initiating purging stored hydrocarbons from the hydrocarbon traps, through a purge canister, and then to an engine intake based on an alcohol content of injected fuel; and delaying termination of the selective routing as the alcohol content increases. - View Dependent Claims (18)
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Specification