Systems and methods for reducing vehicle emissions
AssigneeFord Global Technologies, LLC
InventorAed M. Dudar
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for taking mitigating action where a canister purge valve configured to control an amount of fuel vapors inducted into the engine during purging operations of a fuel vapor storage canister, is indicated as being degraded. In one example, a method comprises controlling an amount of pressure directed to a fuel tank and the fuel vapor storage canister via a pump positioned downstream of the fuel tank and canister to actively route fuel vapors to the canister during a refueling event. In this way, fuel vapors may be prevented from being routed to engine intake under conditions of a degraded canister purge valve, which may reduce opportunity for vehicle stall, improve driveability, and which may reduce release of undesired evaporative emissions to atmosphere.
Claims20
A method, comprising:
- controlling an amount of pressure directed to a fuel tank that supplies fuel to an engine of a vehicle, and to a fuel vapor storage canister receiving fuel vapors from the fuel tank, via a pump positioned downstream of the fuel tank and the canister, to actively route fuel vapors to the canister during a refueling event where fuel is added to the fuel tank.
A method, comprising:
- actively routing fuel vapors to a fuel vapor storage canister configured to receive fuel vapors from a fuel tank in a vehicle, the fuel tank supplying fuel to an engine, during a refueling event where a canister purge valve configured to selectively couple the fuel vapor storage canister to the engine is degraded, and where actively routing the fuel vapors involves activating a pump positioned downstream of the fuel tank and the canister.
A system for a hybrid vehicle, comprising:
- a controller with computer readable instructions stored in non-transitory memory that, when executed, cause the controller to:
- actively route fuel vapors generated during a refueling event where fuel is added to a fuel tank of the vehicle to either a fuel vapor storage canister positioned in an evaporative emissions system of the vehicle or to an exhaust catalyst positioned in an exhaust system of an engine for propelling the vehicle under conditions where a canister purge valve configured to selectively couple the fuel vapor storage canister to atmosphere is degraded, where actively routing fuel vapors includes activating a pump positioned downstream of the fuel tank and the fuel vapor storage canister.
Dependencies are inferred from the claim text.