Systems and methods for a fuel vapor canister heating element
First Claim
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1. A method, comprising:
- during a first condition, including an engine-off condition, activating a fuel vapor canister heating element;
directing atmospheric air through a fuel vapor canister and into an engine intake; and
indicating degradation of the fuel vapor canister heating element based on an output of an engine intake air temperature sensor.
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Abstract
A method is presented, wherein a fuel vapor canister heating element is activated during a first condition, which includes an engine-off condition, and atmospheric air is directed through the fuel vapor canister and into an engine intake. Degradation of the fuel vapor canister heating element is indicated based on an output of an engine intake air temperature sensor. In this way, the integrity of the fuel vapor canister heating element can be determined without relying on canister temperature sensors, which may be confounded by the cooling of the fuel vapor canister during fuel vapor desorption.
11 Citations
20 Claims
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1. A method, comprising:
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during a first condition, including an engine-off condition, activating a fuel vapor canister heating element; directing atmospheric air through a fuel vapor canister and into an engine intake; and indicating degradation of the fuel vapor canister heating element based on an output of an engine intake air temperature sensor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A system for an engine, comprising:
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a fuel vapor canister; a fuel vapor canister heating element coupled to the fuel vapor canister; an intake air temperature sensor coupled within an engine intake; an engine coolant temperature sensor; a vacuum pump coupled between the fuel vapor canister and atmosphere; and a controller configured with instructions stored in non-transitory memory, that when executed, cause the controller to; during a first condition, including a fuel vapor canister load below a threshold and an intake air temperature within a threshold of an engine coolant temperature, activating the fuel vapor canister heating element; activating the vacuum pump to flow atmospheric air through the fuel vapor canister; and indicating degradation of the fuel vapor canister heating element responsive to a change in intake air temperature less than a threshold. - View Dependent Claims (15, 16, 17, 18)
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19. A method for an evaporative emissions system, comprising:
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following a vehicle-off condition, responsive to a fuel vapor canister load less than a threshold and an engine coolant temperature within a threshold of an engine intake air temperature, activating a fuel vapor canister heating element; isolating a fuel vapor canister from a fuel tank; coupling the fuel vapor canister to atmosphere via an evaporative leak check module vacuum pump; activating the evaporative leak check module vacuum pump in a conformation to pump atmospheric air into the fuel vapor canister; opening a canister purge valve; opening an air intake throttle; indicating degradation of the fuel vapor canister heating element responsive to a change in intake air temperature less than a threshold; and adjusting one or more evaporative emissions system parameters responsive to an indication of degradation of the fuel vapor canister heating element. - View Dependent Claims (20)
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Specification