System and methods for controlling fuel vapor canister purge operations
First Claim
1. A method comprising:
- during vehicle operation, monitoring tire pressure in one or more vehicle tires; and
responsive to a tire pressure decrease greater than a threshold;
sealing an evaporative emissions control system comprising a fuel vapor canister for capturing and storing fuel vapors, the evaporative emissions control system coupled to an engine intake manifold; and
suspending purging of the fuel vapor canister.
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Accused Products
Abstract
Methods and systems are provided for controlling fuel vapor canister purging operations in an evaporative emissions control system of a vehicle. In one example, responsive to an indication of a decrease in tire pressure greater than a threshold, the evaporative emissions control system may be sealed and canister purging operations may be suspended until the tire pressure rises to another threshold. In this way, during conditions wherein tire pressure is indicated to decrease to a threshold, sealing the evaporative emissions control system and suspending canister purging operations may serve to prevent ingestion of water into the fuel vapor canister, thus prolonging the useful life of the fuel vapor canister and reducing the potential for evaporative emissions.
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Citations
20 Claims
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1. A method comprising:
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during vehicle operation, monitoring tire pressure in one or more vehicle tires; and responsive to a tire pressure decrease greater than a threshold; sealing an evaporative emissions control system comprising a fuel vapor canister for capturing and storing fuel vapors, the evaporative emissions control system coupled to an engine intake manifold; and suspending purging of the fuel vapor canister. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method comprising:
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venting a vapor storage canister to atmosphere, the canister coupled to both a fuel tank and an engine intake manifold of a motor vehicle having at least four tires; and ceasing the venting in response to a tire pressure change in a predetermined number of tires exceeding a pressure threshold. - View Dependent Claims (16, 17, 18)
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19. A system for a vehicle, comprising:
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an engine; a fuel vapor canister, configured within an evaporative emissions control system, fluidically coupled to an engine intake manifold via a canister purge valve, and fluidically coupled to atmosphere via a canister vent valve; a barometric pressure sensor in the engine intake manifold; an intake throttle in the intake of the engine; one or more lateral sensors; one or more tire pressure sensors coupled to one or more tires of the vehicle; a controller storing instructions in non-transitory memory, that when executed, cause the controller to; responsive to the vehicle being propelled in a forward direction by an engine coupled to one or more sets of drive wheels; monitor tire pressure in the one or more vehicle tires; monitor barometric pressure via the barometric pressure sensor; control an intake air amount inducted into the engine intake manifold via the throttle when the vehicle is being propelled in the forward direction by the engine; monitor vehicle pitch angle via the one or more lateral sensors in the vehicle, wherein a vehicle pitch angle greater than a threshold pitch angle indicates the vehicle is traveling downhill; seal the evaporative emissions control system by closing the canister purge valve and closing the canister vent valve, and suspend purging of the fuel vapor canister responsive to a tire pressure decrease greater than a threshold and an absence of change in barometric pressure; wherein the absence of change in barometric pressure includes indicating that a throttle position is greater than a throttle position threshold, the throttle position greater than the throttle position threshold indicating accurate barometric pressure readings as monitored by the barometric pressure sensor; and wherein responsive to the absence of a change in barometric pressure and the throttle position less than the throttle position threshold, sealing the evaporative emissions control system and suspending purging of the fuel vapor canister responsive to the vehicle pitch angle less than the threshold pitch angle. - View Dependent Claims (20)
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Specification