Appeal No. 95-0181
Application 08/012,401
in the flexible diaphragm portion of the sensor are avoided by
use of a diaphragm that has a resonance frequency above the
oscillation frequency range of the pressure to be detected in the
cylinder of the engine.
Claim 1 is the only independent claim on appeal, and it
reads as follows:
1. A pressure sensor for sensing a pressure within a
cylinder of an internal combustion engine, comprising:
a hollow main body defining a bore extending
therethrough and adapted to be mounted to an engine cylinder;
a pressure sensing assembly disposed within said bore
of said main body and dividing said bore into a detection cavity
for transmitting therethrough the pressure to be detected at a
pressure receiving end thereof disposed in communication with an
interior of the cylinder and an output cavity through which an
output signal from said pressure sensing assembly is to be
supplied;
a flexible metal diaphragm attached to said main body
at said pressure receiving end of said detection cavity for
sealing said detection cavity;
a pressure transmitting medium filled within said
detection cavity; and
means for preventing resonant vibrations of the
flexible metal diaphragm due to oscillations of the pressure
being detected, said preventing means comprising
said flexible metal diaphragm being configured and
dimensioned to have a resonance frequency above an oscillation
frequency range of the pressure to be detected.
The reference relied on by the examiner is:
Kodama et al. (Kodama) 5,161,415 Nov. 10, 1992
2
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