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US 12,018,625 B1Granted
Methods and systems for an evaporative emission system
AssigneeFord Global Technologies, LLC
InventorAed Dudar
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for a fuel system. In one example, a method may include monitoring uncontrolled venting events when a controller is off and adjusting a cleaning schedule of a canister based on a venting event count including venting events when the controller is on and off.
Claims20
A method for a fuel system of a vehicle, comprising:
- monitoring a sensed fuel tank pressure transducer (FTPT) pressure;
- tracking a number of events comprising where the sensed FTPT pressure changed by a threshold pressure change;
- and
- adjusting a canister cleaning schedule based on the number of events.
1 more element
A method for a fuel system of a hybrid vehicle comprising a fuel system coupled to an engine, the fuel system comprising a fuel tank, a canister, and a fuel tank pressure transducer (FTPT), the method, comprising:
- waking up a controller in response to a pressure change sensed by the FTPT being greater than a threshold change;
- increasing a venting event count;
- and
- adjusting a cleaning schedule of the canister based on the venting event count.
1 more element
A system for a hybrid vehicle, comprising:
- an electric motor coupled to an energy storage device;
- an engine coupled to a fuel system, the fuel system comprising a fuel tank, a canister, a fuel tank pressure transducer (FTPT), a fuel tank isolation valve (FTIV), and a relief valve;
- and
- a controller with computer-readable instructions stored on memory thereof that enable the controller to:
- adjust a cleaning schedule of the canister in response to a learned canister load equaling a threshold canister load, wherein the learned canister load accounts for venting events that occur during vehicle on and vehicle off conditions.
2 more elements
Dependencies are inferred from the claim text.