Glow plug integrated pressure sensor with filter trap

Electric heating – Heating devices – Resistive element: igniter type

Reexamination Certificate

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Details

C123S14500A, C123S14500A, C073S705000, C073S756000, C073S116070

Reexamination Certificate

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11191601

ABSTRACT:
In an integrated glow plug and pressure sensor having a passage leading to the pressure sensor, a porous filter is inserted in the passage. The porous filter provides a four-fold improvement in pressure measurement by (1) acting as a trap for combustion deposits, (2) burning combustion deposits when the glow plug heater is on, (3) acting as a heat shield for reducing thermal shock error of the pressure sensor, and (4) damping acoustic high frequency ringing associated with the pressure passage.

REFERENCES:
patent: 6122971 (2000-09-01), Wlodarczyk
patent: 6575039 (2003-06-01), Murai et al.
patent: 6923042 (2005-08-01), Hiramatsu
patent: 6973820 (2005-12-01), Watarai et al.
patent: 6979801 (2005-12-01), Okazaki et al.

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