Internal-combustion engines – Charge forming device – Having fuel vapor recovery and storage system
Patent
1997-06-30
1999-02-09
Moulis, Thomas N.
Internal-combustion engines
Charge forming device
Having fuel vapor recovery and storage system
F02M 3304
Patent
active
058681205
ABSTRACT:
When a tank filler tube cap is closed, several flow paths having solenoid-operated valves are selectively operated by an engine management computer to control pressurizing of a bladder disposed in a fuel tank and of surrounding fuel vapor space not occupied by the bladder to attenuate fuel vapor generation. Venting of the bladder to atmosphere and of the vapor headspace to a canister are also controlled. The control further regulates the pressure in the bladder relative to that in the vapor headspace. On-board testing for leakage can be automatically accomplished for ascertaining compliance with relevant regulations. When the tank is to be re-fueled, a signal is sent to the computer. If conditions, as sensed by certain sensors, are appropriate, the computer unlatches an access door to the filler tube cap so that upon removal of the cap, no significant pressure differential that might cause vapor to be expelled from the tank to atmosphere, or impede the filling of the tank with fuel from the nozzle, is present. As liquid fuel is dispensed into the tank, the combined volumes of the bladder and the tank vapor headspace are reduced by the volume of liquid fuel introduced into the tank. The headspace cannot be re-pressurized until the cap again closes the filler tube.
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Cook John Edward
Hunter Ronald
Van Wetten Richard J.
Moulis Thomas N.
Siemens Canada Limited
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