US5315875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure sensor for detecting the pressure in the combustion chamber of internal-combustion engines
Assignee: Robert Bosch GmbH
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Filing: 1991-06-27
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Granted: 1994-05-31
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Expires: 2011-06-27
Abstract
Abstract A pressure sensor for detecting pressure in a combustion chamber of internal combustion engines has a housing, a sensor element composed of a piezoresistive material and arranged in the housing, a diaphragm, a punch introducing a pressure to be determined onto the sensor element and located between the diaphragm and the sensor element. The punch has a counterbearing, a hybrid has a base, and a preprocessing circuit has electronic components. The sensor element, the hybrid with its base and the electronic components of the preprocessing circuit are located on the counterbearing of the punch.
Inventors
- 👤 Walter Benedikt
- 👤 Manfred Vogel
- 👤 Werner Herden
- 👤 Johann Konrad
- 👤 Wolfgang Schmidt
- 👤 Josef Tosch
- 👤 Matthias Kuessel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:05
CPC Classifications
G; G01; G01L; G01L23/00; G01L23/08; G01L23/18; G01L9/00; G01L9/0041; G01L9/0051; G01L9/0052
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
135 words
A pressure sensor for detecting pressure in a combustion chamber of internal combustion engines, comprising a housing having an opening; a sensor element composed of a piezo-resistive material and arranged in said housing; a diaphragm fixedly mounted on said housing in the region of said opening of said housing so as to close said opening; a punch introducing a pressure to be determined onto said sensor element and located in said housing between said diaphragm and said sensor element, said punch having an end which bears against an inner surface of said diaphragm, said punch also having a counterbearing; a hybrid having a base; and a preprocessing circuit having electronic components, said sensor element, said hybrid with its base and said electronic components of said preprocessing circuit being located on said counterbearing of said punch.
Claim 2
Dependent Claim
135 words
A pressure sensor for detecting pressure in a combustion chamber of internal combustion engines, comprising a housing having an opening; a sensor element composed of a piezo-resistive material and arranged in said housing; a diaphragm fixedly mounted on said housing in the region of said opening of said housing so as to close said opening; a punch introducing a pressure to be determined onto said sensor element and located in said housing between said diaphragm and said sensor element, said punch having an end which bears against an inner surface of said diaphragm, said punch also having a counterbearing; a hybrid having a base; and a preprocessing circuit having electronic components, said sensor element, said hybrid with its base and said electronic components of said preprocessing circuit being located on said counterbearing of said punch.
Claim 3
Dependent Claim
20 words
A pressure sensor as defined in claim 1, wherein said sensor element is arranged on said base of said hybrid.
Claim 4
Dependent Claim
27 words
A pressure sensor as defined in claim 1, wherein said counterbearing has a side facing said punch, said hybrid being arranged on said side of said counterbearing.
Claim 5
Dependent Claim
27 words
A pressure sensor as defined in claim 1, wherein said hybrid is applied in an axial direction of said pressure sensor on a surface of said counterbearing.
Claim 6
Dependent Claim
22 words
A pressure sensor as defined in claim 1, wherein said base of said hybrid is composed of Al 2 O 3 .
Claim 7
Dependent Claim
20 words
A pressure sensor as defined in claim 1, wherein said base of said hybrid is composed of a Kapton film.
Claim 8
Dependent Claim
18 words
A pressure sensor as defined in claim 1, wherein said base of said hybrid is composed of SiCrAl.
Claim 9
Dependent Claim
24 words
A pressure sensor as defined in claim 1; and further comprising an insulation layer located between said base of said hybrid and said components.
Claim 10
Dependent Claim
23 words
A pressure sensor as defined in claim 8, wherein said hybrid is composed of SiCrAl, while said insulation layer is composed of glass.
Claim 11
Dependent Claim
23 words
A pressure sensor as defined in claim 1, wherein said counterbearing is composed of SiCrAl and serves as said base of said hybrid.
Claim 12
Dependent Claim
17 words
A pressure sensor as defined in claim 1; and further comprising means for bonding said electronic components.
Claim 13
Dependent Claim
19 words
A pressure sensor as defined in claim 11, wherein said bonding means include bonding wires and thick-film conductor tracks.
Claim 14
Dependent Claim
28 words
A pressure sensor as defined in claim 1, wherein said piezoresistive element has resistive films which are printed in direction of a current flowing through said resistive films.
Claim 15
Dependent Claim
16 words
A pressure sensor as defined in claim 1, wherein said punch is composed of glass ceramic.
Claim 16
Dependent Claim
16 words
A pressure sensor as defined in claim 1, wherein said counterbearing is pressed into said bearing.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-05-30 | 1997-11-29 | 1998-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-05-30 | 2001-11-29 | 2002-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-05-30 | 2005-11-29 | 2006-05-31 | $7700.00 | Window Closed / Lapsed |