US4878381A
Expired / Lapsed
US
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Evaluation device for measuring signals of a lambda probe
Assignee: Robert Bosch GmbH
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Filing: 1988-11-23
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Granted: 1989-11-07
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Expires: 2008-11-23
Abstract
Abstract An evaluation device for producing an interference free output signal from a measuring signal of a lambda probe arranged in an exhaust gas outlet of an internal combustion engine includes the following function units: an integrator for integrating the measuring signal from the probe for an adjustable time interval; a computer for computing from predetermined operational variables of the engine periods of pressure pulsations of the exhaust gas; and a computerized timer cooperating with the computer to define a time interval for the integrating operation corresponding to an integer multiple of a period of special pulsations computed by the computer.
Inventors
- 👤 Winfried Moser
- 👤 Christian Klinke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:19
CPC Classifications
G; G01; G01M; G01M15/00; G01M15/04; G01M15/10; G01M15/102; G01M15/104; F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1477; F02D41/1482
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
110 words
An evaluation device for neutralizing interference components of a measuring signal from a lambda probe arranged in an exhaust gas stream of an internal combustion engine, comprising means for computing from predetermined operational variables of the engine periods of pressure pulsation of the exhaust gas; means for integrating the measuring signal from the probe for an adjustable time interval to produce an integrated output signal; and means for timing said integrating means to integrate for a time interval corresponding to an integer multiple of a period of pressure pulsations computed by said computing means such that the integrated output signal corresponds to an interference free measuring signal from the probe.
Claim 2
Dependent Claim
110 words
An evaluation device for neutralizing interference components of a measuring signal from a lambda probe arranged in an exhaust gas stream of an internal combustion engine, comprising means for computing from predetermined operational variables of the engine periods of pressure pulsation of the exhaust gas; means for integrating the measuring signal from the probe for an adjustable time interval to produce an integrated output signal; and means for timing said integrating means to integrate for a time interval corresponding to an integer multiple of a period of pressure pulsations computed by said computing means such that the integrated output signal corresponds to an interference free measuring signal from the probe.
Claim 3
Dependent Claim
87 words
An evaluation device as defined in claim 1, wherein said integrating means includes an integrator having a data input for receiving said measuring signal, clock inputs for receiving start and stop pulses, a data output for delivering an integrated output signal; said computing means including a plurality of data inputs for receiving input signals corresponding to the operational variables of the engine; and said timing means including a timer controlled by said computing means to deliver at its output said start and stop pulses for said integrator.
Claim 4
Dependent Claim
77 words
An evaluation device as defined in claim 2, wherein said internal combustion engine has a plurality of cylinders, said integer multiple of a period of pressure pulsations computed by said computing means being a multiplication factor "1", and said timer depending on the magnitude of said operational variables of the engine delivering a start point for the integrator at a time point at which the exhaust gas stream from a predetermined cylinder has reached the lambda probe.
Claim 5
Dependent Claim
35 words
An evaluation device as defined in claim 3, wherein said computing means includes a storage for start time points, said storage being addressable by predetermined operational variables of the engine, particularly by the rotary speed.
Claim 6
Dependent Claim
29 words
An evaluation device as defined in claim 3, wherein said computing means computes the start time point for the integrator from the momentary actual values of said operational variables.
Claim 7
Dependent Claim
41 words
An evaluation device as defined in claim 3; further comprising a plurality of intermediate storage means assigned to respective cylinders.of the engine, said intermediate storage means cooperating with said integrator to store the integrated output signals pertaining to the corresponding cylinders.
Claim 8
Dependent Claim
32 words
An evaluation device as defined in claim 3, wherein said timer delivers the integration start signal at an arbitrary time point without regard to the differences between individual cylinders of the engine.
Claim 9
Dependent Claim
29 words
An evaluation device as defined in c1aim 2, wherein the start time points for the integrator are defined by the angle of rotation of the crankshaft of the engine.
Claim 10
Dependent Claim
29 words
An evaluation device as defined in c1aim 2, wherein the start time points for the integrator are defined by the angle of rotation of the crankshaft of the engine.
Claim 11
Dependent Claim
23 words
An evaluation device as defined in claim 2, wherein said computing means and said timing means are in the form of a microcomputer.
Claim 12
Dependent Claim
31 words
An evaluation device as defined in claim 9, wherein said integrator is a discrete structural unit including an RC integrating member and inputs for resetting and for sampling the RC member.
Claim 13
Dependent Claim
28 words
An evaluation device as defined in claim 2, wherein said integrating means include a time standardizing device for standardizing the integrated output signal to said period of pulsation.
Claim 14
Dependent Claim
22 words
An evaluation device as defined in claim 11, wherein said standardizing device divides said integrated output signal by said period of pulsations.
Claim 15
Dependent Claim
24 words
An evaluation device as defined in claim 11, wherein said standardization device multiplies said integrated output signal by the rotary speed of the engine.
References Cited (Backward Citations)
US4601276A
Cited
US4601273A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-06 | 1993-05-08 | 1993-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-06 | 1997-05-08 | 1997-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-06 | 2001-05-08 | 2001-11-07 | $7700.00 | Window Closed / Lapsed |