System and method for purging fuel vapors using exhaust gas
First Claim
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1. A system for a vehicle, comprising:
- an engine;
an air intake passage coupled to the engine;
an exhaust passage coupled to the engine;
a fuel vapor storage system fluidly coupled with the air intake passage and the exhaust passage, said fuel vapor storage system configured to store and release fuel vapors, the fuel vapor storage system being fluidly coupled with the air intake passage via a fuel vapor purging passage;
a fuel storage tank having an ullage space that is fluidly coupled with the fuel vapor purging passage between the fuel vapor storage system and the air intake passage; and
a control system configured to;
during a first mode, route exhaust gas from the engine to the fuel vapor storage system via at least the exhaust passage; and
during a second mode, route at least fresh air to the fuel vapor storage system to release fuel vapors from the fuel vapor storage system before being inducted into the engine via the air intake passage to be burned.
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Abstract
A system for a vehicle, comprising of an engine, an air intake passage coupled to the engine, an exhaust passage coupled to the engine, a fuel vapor storage system fluidly coupled with the intake air passage and the exhaust passage, said fuel vapor storage system configured to store and release fuel vapors, a control system configured to during a first mode, route exhaust gas from the engine to the fuel vapor storage system via at least the exhaust passage, and during a second mode, route at least fresh air to the fuel vapor storage system to release fuel vapors from the fuel vapor storage system before being inducted into the engine via the air intake passage to be burned.
29 Citations
15 Claims
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1. A system for a vehicle, comprising:
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an engine; an air intake passage coupled to the engine; an exhaust passage coupled to the engine; a fuel vapor storage system fluidly coupled with the air intake passage and the exhaust passage, said fuel vapor storage system configured to store and release fuel vapors, the fuel vapor storage system being fluidly coupled with the air intake passage via a fuel vapor purging passage; a fuel storage tank having an ullage space that is fluidly coupled with the fuel vapor purging passage between the fuel vapor storage system and the air intake passage; and a control system configured to; during a first mode, route exhaust gas from the engine to the fuel vapor storage system via at least the exhaust passage; and during a second mode, route at least fresh air to the fuel vapor storage system to release fuel vapors from the fuel vapor storage system before being inducted into the engine via the air intake passage to be burned. - View Dependent Claims (2, 3, 4, 5, 6, 7, 15)
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8. A method for operating an engine of a vehicle, including at least a fuel tank and a fuel vapor storage system coupled to the engine, the method comprising:
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during a first condition, adjusting an amount of exhaust gas fed to the fuel vapor storage system; during a second condition, feeding fresh air to the fuel vapor purging system and adjusting an amount of the fresh air that is fed to the fuel vapor storage system based on an exhaust air-fuel ratio of the engine, and releasing fuel vapors stored in the fuel vapor storage system into at least said fed fresh air; and routing at least said fresh air from the fuel vapor storage system to an intake manifold of the engine so that at least the fresh air is introduced into the engine to be burned carrying the released fuel vapors. - View Dependent Claims (9, 10, 11, 12, 13)
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14. A method for operating an engine of a vehicle, including at least a fuel tank and a fuel vapor storage system coupled to the engine, the method comprising:
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during a first condition, adjusting an amount of exhaust gas fed to the fuel vapor storage system; during a second condition, adjusting an amount of fresh air fed to the fuel vapor storage system and releasing fuel vapors stored in the fuel vapor storage system into at least said fed fresh air, and adjusting an amount of the exhaust gas fed to the fuel vapor storage system; and routing at least said fresh air from the fuel vapor storage system to an intake manifold of the engine so that at least the fresh air is introduced into the engine to be burned carrying the released fuel vapors.
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Specification