Fuel injectors with integral fiber optic pressure sensors and associated compensation and status monitoring devices
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United States of America Patent
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Mar 4, 2008
Grant Date -
N/A
app pub date -
Sep 22, 2003
filing date -
Feb 6, 1997
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Fuel injectors (10) for internal combustion engines are modified and equipped with fiber optic fuel pressure sensors (12) and fiber optic combustion pressure sensors (14). The combustion pressure sensors (14) are located in separate channels (26) formed in the fuel injectors with the lower portion (22) of the channels leading to the combustion chambers. Above the combustion pressure sensors (14) are fiber optic leads (24). In the preferred embodiments the sensors (46) are equipped with diaphragms (40) of novel shape (48) and employ multiple pairs of fibers (86, 88), temperature sensitive components (72, 74, 126) and novel compensation and status monitoring circuits (FIGS. 6, 9, 10, 14, 15, 18).
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