Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1984-10-26
1987-02-24
Budd, Mark O.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310319, H01L 4108
Patent
active
046459650
ABSTRACT:
A cylinder pressure transmitter has a body with a chamber open at one end accommodating pressure responsive piezoelectric means. A cup-shaped diaphragm member has a side wall secured with a laser weld to a neck portion of the body which is formed as a rim around the chamber opening. The bottom of the member extends over the opening and has a slightly domed portion exposed to the pressure in a cylinder of an internal combustion engine to serve as a diaphragm responsive to variations in cylinder pressure to apply corresponding pressure forces to the piezoelectric means, thereby to provide initial electrical signals corresponding to the cylinder pressures. Electronic means are carried on the body to amplify the initial electrical signals for transmission to computer control means at a location remote from the cylinder for regulating engine operation to improve performance. Force transmitting means such as a metal ball and a ceramic socket are arranged in sequence to be movable in the body chamber, include materials of relatively low thermal conductivity, and have portions of different areas and crosssections cooperating between the diaphragm member bottom and the piezoelectric means for accurately transmitting pressure forces from the diaphragm to the piezoelectric means while retarding transfer of heat from the cylinder environment to the piezoelectric means through the diaphragm.
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Budd Mark O.
Haug John A.
McAndrews James P.
Sharp Melvin
Texas Instruments Incorporated
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