Patent US5162930A successfully refreshed from Google Patents.
US4424705A
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US
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Engine knock sensing apparatus
Assignee: Toyota Motor Corp
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Filing: 1981-12-28
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Granted: 1984-01-10
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Expires: 2001-12-28
Abstract
Abstract A knocking sensing apparatus for sensing a knocking taking place in an internal combustion engine. The apparatus includes a diaphragm adapted to operate in response to the pressure of cooling water circulated in the engine, magnetism generating device, magnetic circuit including the diaphragm, and a magnetic flux detecting device adapted to detect in a manner like alternating current the change in the magnetic flux in the magnetic circuit caused by the operation of the diaphragm.
Inventors
- 👤 Tadashi Hattori
- 👤 Masanori Hanaoka
- 👤 Yukihide Hashiguchi
- 👤 Yoshinori Ootsuka
- 👤 Hiroaki Yamaguchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 03:19
CPC Classifications
G; G01; G01H; G01H11/00; G01H11/02; G01L; G01L23/00; G01L23/22; G01L23/221; G01L23/223
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
79 words
An apparatus for sensing a knocking taking place in an internal combustion engine having a cylinder block through which cooling water circulates comprising: a diaphragm mounted to the block and directly responsive to a pulsation in pressure of the cooling water, said diaphragm being of a substantially partially spherical surface; means adjacent said diaphragm for sensing the pulsating movement thereof in a manner like alternating current; and means for producing an output corresponding to said pulsation in fluid pressure.
Claim 2
Independent Claim
79 words
An apparatus for sensing a knocking taking place in an internal combustion engine having a cylinder block through which cooling water circulates comprising: a diaphragm mounted to the block and directly responsive to a pulsation in pressure of the cooling water, said diaphragm being of a substantially partially spherical surface; means adjacent said diaphragm for sensing the pulsating movement thereof in a manner like alternating current; and means for producing an output corresponding to said pulsation in fluid pressure.
Claim 3
Dependent Claim
54 words
An apparatus as set forth in claim 1 further comprising means for generating magnetism; a magnetic circuit means including said diaphragm as its portion; means for detecting in a manner like alternating current that change in a magnetic flux existent in said circuit means which is caused by the pulsating movement of said diaphragm.
Claim 4
Dependent Claim
30 words
An apparatus as set forth in claim 1 further comprising a piezoelectric element attached to said diaphragm to sense the pulsation of said diaphragm in a manner like alternating current.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-01-09 | 1987-07-11 | 1988-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-01-09 | 1991-07-11 | 1992-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-01-09 | 1995-07-11 | 1996-01-10 | $7700.00 | Window Closed / Lapsed |