Systems and methods for an evaporative emissions system and fuel system having a single delta pressure sensor
AssigneeFord Global Technologies, LLC
InventorAed M. Dudar
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for including a single pressure sensor in an evaporative emissions system and fuel system. In one example, a method may include venting a fuel tank of the fuel system, which is isolated from the evaporative emissions system by a fuel tank isolation valve (FTIV), in response to a depressurization condition determined based on a differential pressure measured by a delta pressure sensor coupled across the FTIV. The venting may include pulsing the FTIV open and closed and may further include adjusting the pulsing responsive to the differential pressure measured while the FTIV is closed and independent of the differential pressure measured while the FTIV is open.
Claims20
A method, comprising:
- operating with a depressurization condition;
- venting a fuel tank by pulsing a fuel tank isolation valve (FTIV) open and closed in response to the depressurization condition, the depressurization condition determined based on a differential pressure measured by a single delta pressure sensor coupled across the FTIV;
- and
- adjusting the pulsing responsive to a differential pressure measured while the FTIV is closed and independent of a differential pressure measured while the FTIV is open during the pulsing.
A method, comprising:
- measuring a differential pressure of a sealed fuel tank and an evaporative emissions system with only one delta pressure sensor coupled across a fuel tank isolation valve (FTIV), the FTIV positioned between the sealed fuel tank and a fuel vapor storage canister of the evaporative emissions system, while the FTIV is closed and not while the FTIV is open;
- and
- depressurizing the sealed fuel tank in response to the measured differential pressure being greater than a threshold pressure.
A system, comprising:
- an engine configured to combust air and fuel;
- a fuel system, including a fuel tank for storing the fuel;
- an evaporative emissions system in fluidic communication with the fuel system via a conduit, the conduit including a fuel tank isolation valve (FTIV), and an intake of the engine via a purge line, the evaporative emissions system including a fuel vapor storage canister;
- a delta pressure sensor coupled across the FTIV, the delta pressure sensor including a first pressure port fluidically coupled to the conduit between the fuel tank and the FTIV and a second pressure port fluidically coupled to the conduit between the fuel vapor storage canister and the FTIV;
- and
- a controller storing instructions in non-transitory memory that, when executed, cause the controller to:
- measure a differential pressure between the fuel system and the evaporative emissions system via the delta pressure sensor while the FTIV is closed and not while the FTIV is open;
- determine a depressurization condition of the fuel tank based on the measured differential pressure;
- vent the fuel tank responsive to the depressurization condition by pulsing the FTIV open and closed;
- and
- adjust the pulsing based on the measured differential pressure.
Dependencies are inferred from the claim text.