Glow plug integrated pressure sensor

Details Glow plug integrated pressure sensor Glow plug integrated pressure sensor

2007-04-24

2007-04-24

Lefkowitz, Edward (Department: 2855)

Measuring and testing

Test stand

For engine

C073S117020, C073S117020, C073S118040, C073S114220, C073S115060

Reexamination Certificate

active

11059920

ABSTRACT:
A pressure-sensing element for an internal combustion engine is located in the sleeve of a ceramic glow plug heater having axial and radial pressure channels connecting the sensor diaphragm to the combustion chamber. The sensor signal conditioner is encapsulated in an automotive-type connector either directly attached to the glow plug body or located at the end of a cable pigtail containing the sensor fibers and the heater positive potential wire. A high temperature rated fiber optic pressure sensor capable of measuring either dynamic or absolute pressure is used. The absolute pressure sensor relies on three optical fibers combined in a common ferrule in the sensor head area and connected to one light source (LED) and two detectors (photodiodes) in the signal conditioner area. The fibers can either be identical by being spaced unequally in the ferrule or can have different diameters, numerical aperatures, or both, and be spaced equally or unequally. The fiber parameters or their spacing are selected to maximize the difference in the response of the “measurement” and “reference” detectors to changing pressure.

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