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US 7,025,084 B2Granted
Integrated pressure management system for a fuel system
AssigneeSiemens VDO Automotive Corporation
InventorsPaul D. Perry, John E. Cook
Life of this patent
Estimating the term…
Abstract
An integrated pressure management system manages pressure and detects leaks in a fuel system. The integrated pressure management system also performs a leak diagnostic for the head space in a fuel tank, a canister that collects volatile fuel vapors from the head space, a purge valve, and all associated.
Claims15
A method of managing pressure in a fuel system of an internal combustion engine, the fuel system including a fuel tank, a purge valve and a charcoal canister, the method comprising:
- coupling an integrated assembly in fluid communication between the charcoal canister and a vent port at ambient atmospheric pressure, the integrated assembly including a switch actuated in response to the pressure and a pressure operable device actuated to relieve the pressure;
- and
- signaling with the switch a negative pressure, relative to ambient atmospheric pressure, at a first pressure level when the internal combustion engine is not operating, the signaling including the pressure operable device actuating the switch prior to the pressure operable device being actuated to relieve negative pressure.
Dependencies are inferred from the claim text.