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US4891978A
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Apparatus for measuring the mass of a flowing medium and method for producing an apparatus for measuring the mass of a flowing medium
Assignee: Robert Bosch GmbH
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Filing: 1989-02-08
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Granted: 1990-01-09
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Expires: 2009-02-08
Abstract
Abstract An apparatus for measuring the mass of a flowing medium and a method for producing the apparatus. The apparatus includes a carrier, to which at least one resistor layer is applied. To calibrate the resistance value of the resistor layer, material can be removed in a calibration zone on the end of the resistor layer remote from the incident direction of flow. To this end, the resistor layer is connected with a current source furnishing a constant current. The temperature of the resistor layer is measured by means of a temperature measuring device and compared in an electronic device with a predetermined temperature, and the electronic device, upon a deviation of the measured temperature from the predetermined temperature triggers a material removing device for the removal of resistor material in the calibration zone (trimming zone).
Inventors
- 👤 Jaihind S. Sumal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:29
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/68; G01F1/684; G01F1/688; G01F1/69; G01F1/692; G01F25/00; G01F25/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
98 words
A device for measuring the mass of a flow medium of an intake tube of an internal combustion engine, which comprises a substrate with parallel faces having a leading edge and a trailing edge, a resistor layer covering a major portion of at least one face of said substrate with said resistor layer extending from said leading edge toward said trailing edge, with a portion of said substrate extending along said trailing edge thereof free of said resistor layer, means for supporting said substrate in said intake tube with said trailing edge positioned down-stream in said flow medium.
Claim 2
Independent Claim
98 words
A device for measuring the mass of a flow medium of an intake tube of an internal combustion engine, which comprises a substrate with parallel faces having a leading edge and a trailing edge, a resistor layer covering a major portion of at least one face of said substrate with said resistor layer extending from said leading edge toward said trailing edge, with a portion of said substrate extending along said trailing edge thereof free of said resistor layer, means for supporting said substrate in said intake tube with said trailing edge positioned down-stream in said flow medium.
Claim 3
Dependent Claim
37 words
A device as set forth in claim 1, in which said device includes a resistor layer formed on each side of said substrate with each face having corresponding resistor layer-free portions along one end of said substrate.
Claim 4
Independent Claim
133 words
A method of positioning a device including a substrate with parallel faces having a leading edge and a trailing edge with a resistor layer covering a major portion of at least one face of said substrate, said resistor layer extending from said leading edge toward said trailing edge, with a resistor layer-free portion extending along said trailing edge of said substrate, which comprises positioning said substrate in an intake tube of an internal combustion engine for measuring a flow medium, positioning said substrate within said intake tube with said leading edge toward the direction from which said flow medium flows with said parallel faces parallel with a direction of a flow of said flow medium, and positioning said trailing edge of said substrate down-stream of the direction of flow of said flow medium.
Claim 5
Independent Claim
133 words
A method of positioning a device including a substrate with parallel faces having a leading edge and a trailing edge with a resistor layer covering a major portion of at least one face of said substrate, said resistor layer extending from said leading edge toward said trailing edge, with a resistor layer-free portion extending along said trailing edge of said substrate, which comprises positioning said substrate in an intake tube of an internal combustion engine for measuring a flow medium, positioning said substrate within said intake tube with said leading edge toward the direction from which said flow medium flows with said parallel faces parallel with a direction of a flow of said flow medium, and positioning said trailing edge of said substrate down-stream of the direction of flow of said flow medium.
Claim 6
Dependent Claim
37 words
A method as set forth in claim 3, in which said substrate includes a resistor layer on each of said parallel faces, with each parallel face having corresponding resistor layer-free portions along one end of said substrate.
References Cited (Backward Citations)
US4213335A
Cited
US4399697A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-08 | 1993-07-10 | 1994-01-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-08 | 1997-07-10 | 1998-01-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-08 | 2001-07-10 | 2002-01-09 | $7700.00 | Window Closed / Lapsed |