Vapor recovery system
AssigneeFord Global Technologies, LLC
InventorsMarcus William Fried, Peter Charles Moilanen, William Jeffrey Clemens
Life of this patent
Estimating the term…
Abstract
A fuel vapor recovery system for a direct injection internal combustion engine operating in both stratified and homogenous modes includes using fuel vapor with air assisted injectors. A compressor compresses a controlled mixture of fresh air and fuel vapor which is then delivered to the air supply of air assisted injectors, allowing fuel vapors to be purged from the vapor recovery system during all engine operating modes.
Claims11
A fuel vapor recovery system for maintaining charge stratification of a direct injection internal combustion engine comprising:
- a plurality of air assisted injectors for injecting fuel and air into the engine;
- a compressor, for compressing a mixture of fuel vapor and air, coupled to an air supply of each of the plurality of air assisted injectors;
- a control valve for controlling a flow of fuel vapor and a flow of air in said mixture responsive to a desired vapor purge rate;
- and
- a fuel vapor source for supplying fuel vapor to said control valve.
A fuel vapor recovery control system for maintaining charge stratification of a direct injection internal combustion engine comprising:
- a plurality of air assisted injectors for injecting fuel and air into the engine;
- a compressor, for supplying a compressed mixture of fuel vapor and air, coupled to an air supply of each of the plurality of air assisted injectors;
- a first control valve connected to the compressor for controlling a purge rate of fuel vapor;
- a second control valve connected to the compressor for controlling a fresh air rate of fresh air;
- a vapor source connected to the first control valve for supplying fuel vapor to said first control valve;
- and
- a controller for controlling a purge vapor flow rate by adjusting the first control valve and second control valve in response to a desired purge rate.
A fuel vapor recovery control method for maintaining charge stratification of a direct injection internal combustion engine comprising a plurality of air assisted injectors for injecting fuel and air into the engine, a compressor, for supplying a compressed mixture of fuel vapor and air, coupled to an air supply of each of the plurality of air assisted injectors, a first control valve connected to the compressor for allowing fuel vapor to enter the compressor, a second control valve connected to the compressor for allowing fresh air to enter the compressor, a vapor source connected to the first control valve for supplying fuel vapor to said first control valve, and a third control valve connected to the vapor source for allowing fresh air into the vapor source, the method comprising the steps of:
- adjusting a vapor purge rate by changing a ratio of a first area of the first control valve and a second area of the second control valve in response to a desired purge rate;
- and
- changing a third area of the third control valve in response to the desired purge rate.
A fuel vapor recovery system for maintaining charge stratification of a direct injection internal combustion engine comprising:
- a plurality of air assisted injectors for injecting fuel and air into the engine;
- a compressor, for compressing a mixture of fuel vapor and air, coupled to an air supply of each of the plurality of air assisted injectors;
- a pair of control valves for controlling a ratio of fuel vapor and air in said mixture responsive to a desired vapor purge rate;
- and
- a fuel vapor source for supplying fuel vapor to said control valve.
Dependencies are inferred from the claim text.