Diagnosing apparatus for evaporation purge system and pressure sensor
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United States of America Patent
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Nov 12, 2002
Grant Date -
Jun 28, 2001
app pub date -
Dec 21, 2000
filing date -
Dec 27, 1999
priority date (Note) -
Expired
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Abstract
A highly accurate diagnosing apparatus for an evaporation purge system, which is not so easily affected by fluctuation in an atmospheric pressure. An evaporation system including a fuel tank is set in a pressure state different from an atmospheric pressure, and then hermetically sealed during leakage diagnosis. A reference pressure is introduced to the reference pressure introduction side of a relative pressure sensor, and a pressure in the evaporation system is introduced to the detected pressure introduction side thereof. In an atmosphere introduction passage for opening the reference pressure introduction side of the relative pressure sensor to atmosphere, a solenoid valve is provided for the relative pressure sensor. During the leakage diagnosis, a control unit sets the solenoid valve in a closed state, holds the reference pressure at a constant value, and then determines the presence of leakage in the evaporation system based on a relative pressure change detected by the relative pressure sensor.
First Claim
Family
- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
- FUJI JUKOGYO KABUSHIKI KAISHA
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
---|---|---|---|
Yamaki, Masahito | Tokyo, JP | 3 | 164 |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
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