System and method for purging a canister purge valve filter
a technology of purging valve and purging system, which is applied in the direction of machines/engines, electrical control, separation processes, etc., can solve the problems of reducing the flow rate from the canister to the engine, and the evaporative emission system may not operate as intended, so as to reduce the amount of fuel vapor and reduce the flow rate
Active Publication Date: 2022-04-21
FORD GLOBAL TECH LLC
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- Description
- Claims
- Application Information
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Benefits of technology
The patent describes a system for reducing fuel vapor emissions from a vehicle. It captures fuel vapor during parked periods, refueling, and operation. The system uses a canister filled with a purge valve to release the fuel vapor to the engine. However, a filter in the system may become clogged with contaminants, reducing the flow rate. To solve this problem, the patent proposes a method to regenerate the filter, which eliminates the need for service. The system uses existing turbocharger or pump technology, reducing system cost. The patent also includes a method to determine if the purge valve is clogged, allowing for efficient purging.
Problems solved by technology
However, over time, the filter may fill with contaminants and it may reduce a flow rate from the canister to the engine.
If the filter becomes too clogged with contaminants, the evaporative emissions system may not operate as intended.
Method used
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[0016]The present description is related to diagnosing and purging a canister purge valve filter of an evaporative emissions system of a vehicle. The canister purge valve filter may reduce degradation of a canister purge valve by keeping contaminants from flowing from a fuel vapor storage canister to the canister purge valve. The canister purge valve may selectively allow fuel vapors to flow to an engine as is shown in FIG. 1. The engine may be supplied fuel from a fuel system including an evaporative emissions system as is shown in FIGS. 2 and 5. The canister purge valve filter may be evaluated for clogging by contaminants according to the sequences of FIGS. 3D and 6. An example pumping module that includes a control valve and pump is shown in FIGS. 3A-3C. Methods for purging contaminants from a canister purge valve filter are shown in FIGS. 4 and 7.
[0017]Referring to FIG. 1, internal combustion engine 10, comprising a plurality of cylinders, one cylinder of which is shown in FIG. ...
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Abstract
Systems and methods for regenerating a canister purge valve filter that is included in an evaporative emissions system are disclosed. In one example, pressurized air is applied to a canister purge valve filter to dislodge contaminants from the filter. The contaminants may be discharged from the evaporative emissions system via a check valve that opens in response to the pressurized air.
Description
FIELD[0001]The present description relates to methods and systems for clearing contaminants from a canister purge valve filter. The methods may expel contaminants that are trapped in the canister purge valve filter to outside of a fuel vapor storage system.BACKGROUND AND SUMMARY[0002]A vehicle may be equipped with an evaporative emissions system for reducing an amount of fuel vapor that may escape from a vehicle. The evaporative emissions system may capture fuel vapors while the vehicle is parked and not operating, while the vehicle is being refueled, and while the vehicle is being operated. The vehicle may trap fuel vapors in a fuel vapor storage canister for subsequent introduction to an engine after the engine is started. The fuel vapor may flow from the fuel vapor storage canister to the engine via a canister purge valve. The canister purge valve may be protected from contaminants in the fuel vapor storage system via a filter. However, over time, the filter may fill with contami...
Claims
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IPC IPC(8): F02D41/00B01D53/04F02M25/08B01D46/00B01D46/71
CPCF02D41/0077B01D53/0415F02M25/0836B01D46/0036B01D2259/40086B01D53/0446B01D46/71B01D2259/4516F02M25/0872F02M25/08F02M25/0854F02B77/04F02B2077/045F02D41/0032B01D2279/60
Inventor DUDAR, AED
Owner FORD GLOBAL TECH LLC