Leak detection for canister purge valve
First Claim
Patent Images
1. A method for a vehicle with an engine comprising:
- indicating a leak in response to a temperature change in a fuel vapor canister coupled to a fuel tank in an emission control system while the engine is in operation and a purge valve is closed;
wherein indicating the leak in response to the fuel vapor canister temperature change is performed in response to a fault in a pressure sensor coupled to the fuel tank.
1 Assignment
0 Petitions
Accused Products
Abstract
Methods and systems for detecting a leak in a canister purge valve are disclosed. In one example approach, a method comprises indicating a leak in response to a temperature change in a fuel vapor canister coupled to a fuel tank in an emission control system while the engine is in operation and a purge valve is closed.
41 Citations
17 Claims
-
1. A method for a vehicle with an engine comprising:
-
indicating a leak in response to a temperature change in a fuel vapor canister coupled to a fuel tank in an emission control system while the engine is in operation and a purge valve is closed; wherein indicating the leak in response to the fuel vapor canister temperature change is performed in response to a fault in a pressure sensor coupled to the fuel tank. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method for a vehicle with an engine comprising:
-
during engine-on conditions; closing or maintaining a purge valve closed; and indicating a leak in response to a temperature change in a fuel vapor canister coupled to a fuel tank in an emission control system; wherein indicating the leak in response to the temperature change in the fuel vapor canister comprises indicating a leak in the purge valve. - View Dependent Claims (11, 12, 13, 14, 15)
-
-
16. A method for a vehicle with an engine comprising:
-
indicating a leak in response to a temperature decrease in a fuel vapor canister coupled to a fuel tank in an emission control system while the engine is in operation and a purge valve is closed, where the purge valve is disposed in a conduit coupling the canister to an intake of the engine; and wherein indicating the leak in response to the temperature decrease in the fuel vapor canister is performed in response to a fault in a pressure sensor coupled to the fuel tank. - View Dependent Claims (17)
-
Specification