US4457167A
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Method for measuring the pulsating air mass aspirated by an internal combustion engine
Assignee: Robert Bosch GmbH
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Filing: 1982-09-14
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Granted: 1984-07-03
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Expires: 2002-09-14
Abstract
Abstract A method is proposed for measuring the pulsating air mass aspirated by an internal combustion engine in a flow cross section. To this end, an upper reference value (U or ) is determined from the rpm of the engine, above which value a reversed flow of the air takes place, and an actual flowthrough measurement value (U s ) furnished by a flowthrough measuring device is compared with this upper reference value (U or ). Upon the attainment of the upper reference value (U or ) by the actual flowthrough measurement value (U s ), a time period (t r ) begins to run, which ends whenever the actual flowthrough measurement value (U s ) has again dropped down to the upper reference value (U or ). The time period (t r ) is stored in memory and serves in such a manner to correct the flowthrough measurement value (U s ) upon the occurrence of reversed flow that the polarity of the actual flowthrough measurement value (U s ) is reversed, at the most for the time period (t r ), whenever the actual flowthrough measurement value (U s ) attains a predetermined lower reference value (U ur , U smin ).
Inventors
- 👤 Jaihind S. Sumal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 10:44
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/72; F; F02; F02D; F02D41/00; F02D41/02; F02D41/18; F02D41/187
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
195 words
A method for measuring the pulsating air mass aspirated by an internal combustion system in a flow cross section by means of a flowthrough measuring device, which furnishes a flowthrough measurement value (U s ) associated with a flowthrough value (Q) of the air mass and for the correction of the flowthrough measurement value (U s ) in the event of reversed flow, comprising the steps of, ascertaining an upper reference value (U or ) in accordance with the rpm (n) of the engine, above which a reversed flow of the air takes place, comparing the actual flowthrough measurement value (U s ) furnished by the flowthrough measuring device with the upper reference value (U or ), detecting a time period (t r ) to begin upon attainment of the upper reference value (U or ) by the actual flowthrough measurement value (U s ), which time period ends whenever the actual flowthrough measurement value (U s ) has again dropped to the upper reference value (U or ), and storing the time period (t r ) for subsequent correction of the flowthrough measurement value (U s ) in the event of a reversed flow.
Claim 2
Independent Claim
195 words
A method for measuring the pulsating air mass aspirated by an internal combustion system in a flow cross section by means of a flowthrough measuring device, which furnishes a flowthrough measurement value (U s ) associated with a flowthrough value (Q) of the air mass and for the correction of the flowthrough measurement value (U s ) in the event of reversed flow, comprising the steps of, ascertaining an upper reference value (U or ) in accordance with the rpm (n) of the engine, above which a reversed flow of the air takes place, comparing the actual flowthrough measurement value (U s ) furnished by the flowthrough measuring device with the upper reference value (U or ), detecting a time period (t r ) to begin upon attainment of the upper reference value (U or ) by the actual flowthrough measurement value (U s ), which time period ends whenever the actual flowthrough measurement value (U s ) has again dropped to the upper reference value (U or ), and storing the time period (t r ) for subsequent correction of the flowthrough measurement value (U s ) in the event of a reversed flow.
Claim 3
Dependent Claim
49 words
A method as defined by claim 1, wherein the polarity of the actual flowthrough measurement value (U s ) is reversed for the time period (t r ) whenever the actual flowthrough measurement value (U s ) attains a predetermined lower reference value (U ur , U smin ).
Claim 4
Dependent Claim
45 words
A method as defined by claim 2, wherein the polarity reversal of the actual flowthrough measurement value (U s ) is terminated whenever the actual flowthrough measurement value (U s ) once again attains the predetermined lower reference value (U ur , U smin ).
Claim 5
Dependent Claim
28 words
A method as defined in claim 2 or 3, wherein the actual minimum flowthrough measurement value (U smin ) serves as the lower reference value (U ur ).
Claim 6
Dependent Claim
75 words
A method as defined by claim 2, further comprising the step of, detecting the oscillation period (t p ) of the pulsating air from the rpm (n) of the engine, and wherein the polarity reversal of the actual flowthrough measurement value (U s ) is terminated whenever half the oscillation duration (t p /2) has elapsed after the actual flowthrough measurement value (U s ) has dropped to the upper reference value (U or ).
Claim 7
Dependent Claim
93 words
A method as defined by claim 2, further comprising the step of, detecting the oscillation duration (t p ) of the pulsating air from the rpm (n) of the engine, and wherein the polarity reversal of the actual flowthrough measurement value (U s ) is terminated whenever a time ((t r +t p )/2) has elapsed after the attainment of the maximum actual flowthrough measurement value (U smax ), which time represents half the sum of the time period (t r ) for the reversed flow and the oscillation duration (t p ).
Claim 8
Dependent Claim
100 words
A method as defined by claim 2, further comprising the step of, detecting the oscillation duration (t p ) of the pulsating air from the rpm (n) of the engine, and wherein the polarity reversal of the actual flowthrough measurement value (U s ) is terminated whenever a time (t r +t p /2) has elapsed after the attainment of the upper reference value (U or ) by the actual flowthrough measurement value (U s ), which time represents the sum of the time period (t r ) for the reversed flow plus half the oscillation duration (t p /2).
Claim 9
Dependent Claim
63 words
A method as defined by claim 1, further comprising the step of, detecting the maximum mean flowthrough value (Q mv ) at full load as a function of the rpm (n) of the engine and doubling the value thereof, and wherein the upper reference value (U or ) is ascertained to correspond to twice the maximum mean flowthrough measurement value (2Q mv ).
References Cited (Backward Citations)
US4275695A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-03 | 1988-01-02 | 1988-07-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-03 | 1992-01-02 | 1992-07-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-03 | 1996-01-02 | 1996-07-03 | $7700.00 | Window Closed / Lapsed |