Integrated pressure management system for a fuel system
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F02M-033/02
F16K-031/02
출원번호
US-0102786
(2002-03-22)
발명자
/ 주소
Perry, Paul D.
Cook, John E.
출원인 / 주소
Siemens VDO Automotive Inc.
인용정보
피인용 횟수 :
0인용 특허 :
66
초록▼
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 associa
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.
대표청구항▼
1. An integrated pressure management apparatus for a fuel system of an internal combustion engine, comprising:a leak detector sensing negative pressure in the fuel system at a first pressure level when the internal combustion engine is not operating, the leak detector including a diaphragm; and a pr
1. An integrated pressure management apparatus for a fuel system of an internal combustion engine, comprising:a leak detector sensing negative pressure in the fuel system at a first pressure level when the internal combustion engine is not operating, the leak detector including a diaphragm; and a pressure operable valve operatively connected to the leak detector, the pressure operable valve being contiguously disengaged from the leak detector when relieving negative pressure in the fuel system below the first pressure level and contiguously engaging the leak detector when, in response to movement of the diaphragm, relieving positive pressure above a second pressure level. 2. An integrated pressure management apparatus for a fuel system of an internal combustion engine, comprising:a leak detector sensing negative pressure in the fuel system at a first pressure level when the internal combustion engine is not operating; and a pressure operable valve operatively connected to the leak detector, the pressure operable valve being contiguously disengaged from the leak detector when relieving negative pressure in the fuel system below the first pressure level and contiguously engaging the leak detector when relieving positive pressure above a second pressure level, the pressure operable valve separates a chamber into a first portion communicating with the fuel system and a second portion communicating with a vent port to ambient conditions, and the pressure operable valve permits fluid communication between the fuel system and the vent port in a first configuration and prevents fluid communication between the fuel system and the vent port in a second configuration. 3. The integrated pressure management apparatus according to claim 2, wherein the leak detector comprises a switch signaling displacement of a diaphragm in response to negative pressure at the first pressure level in the first portion of the chamber.4. The integrated pressure management apparatus according to claim 2, wherein the leak detector comprises a signal chamber in fluid communication with the first portion of the chamber, and a diaphragm further separates the signal chamber from the second portion of the chamber.5. The integrated pressure management apparatus according to claim 2, wherein the pressure operable valve comprises:a poppet preventing fluid communication between the fuel system and the vent port in the second configuration; and a spring biasing the poppet toward the second configuration. 6. An integrated pressure management apparatus for a fuel system, comprising:a leak detector sensing negative pressure in the fuel system at a first pressure level; and a pressure operable device operatively connected to the leak detector, the pressure operable device separating a chamber into a first portion communicating with the fuel system and a second portion communicating with a vent port to ambient conditions, and the pressure operable device permitting fluid communication between the fuel system and the vent port in a first configuration and preventing fluid communication between the fuel system and the vent port in a second configuration, the pressure operable device including: a poppet preventing fluid communication between the fuel system and the vent port in the second configuration; a spring biasing the poppet toward the second configuration; and a diaphragm partially defining both the second portion of the chamber, and a signal chamber in fluid communication with the first portion of the chamber, fluid communication between the signal chamber and the second portion of the chamber being prevented in the second configuration; wherein the pressure operable device relieves negative pressure in the fuel system below the first pressure level and relieves positive pressure above a second pressure level, and the negative pressure below the first pressure level displaces the poppet against the spring bias to the first configuration. 7. An integrated pressure management apparatus for a fuel system, comprising:a leak detector sensing negative pressure in the fuel system at a first pressure level; and a pressure operable device operatively connected to the leak detector, the pressure operable device separating a chamber into a first portion communicating with the fuel system and a second portion communicating with a vent port to ambient conditions, and the pressure operable device permitting fluid communication between the fuel system and the vent port in a first configuration and preventing fluid communication between the fuel system and the vent port in a second configuration, the pressure operable device including: a poppet preventing fluid communication between the fuel system and the vent port in the second configuration; a spring biasing the poppet toward the second configuration; and a diaphragm partially defining both the second portion of the chamber, and a signal chamber in fluid communication with the first portion of the chamber, fluid communication between the signal chamber and the second portion of the chamber being prevented in the second configuration; wherein the pressure operable device relieves negative pressure in the fuel system below the first pressure level and relieves positive pressure above a second pressure level, and the positive pressure above the second pressure level in the signal chamber displaces the diaphragm and the poppet against the spring bias to the first configuration. 8. The integrated pressure management apparatus according to claim 2, further comprising:a solenoid displacing the pressure operable valve from the first configuration to the second configuration. 9. An integrated pressure management apparatus for a fuel system, comprising:a housing including first and second portions, the first portion in fluid communication with the fuel system, and the second portion being in fluid communication with ambient conditions; and a poppet movable between first and second configurations with respect to the housing, the first configuration permitting fluid communication between the fuel system and ambient conditions, and the second configuration preventing fluid communication between the fuel system and ambient conditions; and a diaphragm separating the first and second portions, the diaphragm being movable to a first position sensing negative pressure in the fuel system at a first pressure level, and being movable to a second position relieving positive pressure above a second pressure level, the first and second portions being isolated in the second configuration. 10. An integrated pressure management apparatus according to claim 9, wherein the diaphragm in the second position displaces the poppet relative to the housing.
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