US5546916A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for adapting air values from a performance graph
Assignee: Siemens AG
•
Filing: 1995-01-30
•
Granted: 1996-08-20
•
Expires: 2015-01-30
Abstract
Abstract A method and an apparatus are provided for adapting air values from a substitute performance graph to currently prevailing variables of state of ambient air. The air values are used for controlling mixture preparation if pulsations of air occur in an intake tube of an internal combustion engine instead of using measured values supplied by an air meter. The air values are adapted by multiplying the air values by an adaptation factor. In one embodiment the adaptation factor is calculated by dividing a measured value supplied by the air meter in the intake tube of the internal combustion engine by an air value taken from the substitute performance graph and subjecting the adaptation factor to sliding averaging, at times when no pulsations are present; and using a lambda-control-average value as the adaptation factor and subjecting the adaptation factor to sliding averaging, at times when pulsations are present. In another embodiment the adaptation factor is calculated by taking a substitute air value from the substitute performance graph, multiplying the substitute air value by a temperature value, multiplying a reciprocal value of the multiplication by a measured value supplied by the air meter in the intake tube, and subjecting the result to sliding averaging, at times when no pulsations are present; and using a lambda-control-average value as the adaptation factor and subjecting the adaptation factor to sliding averaging, at times when pulsations are present.
Inventors
- 👤 Michael Sudholt
- 👤 Manfred Wier
- 👤 Stephan Krebs
- 👤 Bernhard Bauer
- 👤 Wolfgang Reupke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:44
CPC Classifications
G; G01; G01F; G01F1/00; G01F1/72; F; F02; F02D; F02D41/00; F02D41/02; F02D41/18; F02D41/187; G01F1/68; G01F1/696; G01F1/6965
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
152 words
A method for controlling mixture preparation in an intake tube of an internal combustion engine, which comprises the steps of: 1. measuring air values in an intake tube of an internal combustion engine with an air mass meter; 2. adapting the air values by multiplying the air values by an adaptation factor, and calculating the adaptation factor by: a. dividing a measured value supplied by the air meter in the intake tube of the internal combustion engine by an air value taken from a substitute performance graph and subjecting the adaptation factor to sliding averaging, at times when no pulsations are present; and b. using a lambda-control-average value as the adaptation factor and subjecting the adaptation factor to sliding averaging, at times when pulsations are present; and 3. controlling mixture preparation in the intake tube of the internal combustion engine by employing adapted air values as a signal to a fuel injector.
Claim 2
Independent Claim
152 words
A method for controlling mixture preparation in an intake tube of an internal combustion engine, which comprises the steps of: 1. measuring air values in an intake tube of an internal combustion engine with an air mass meter; 2. adapting the air values by multiplying the air values by an adaptation factor, and calculating the adaptation factor by: a. dividing a measured value supplied by the air meter in the intake tube of the internal combustion engine by an air value taken from a substitute performance graph and subjecting the adaptation factor to sliding averaging, at times when no pulsations are present; and b. using a lambda-control-average value as the adaptation factor and subjecting the adaptation factor to sliding averaging, at times when pulsations are present; and 3. controlling mixture preparation in the intake tube of the internal combustion engine by employing adapted air values as a signal to a fuel injector.
Claim 3
Independent Claim
171 words
A method for controlling mixture preparation in an intake tube of an internal combustion engine, which comprises the steps of: 1. measuring air values in an intake tube of an internal combustion engine with an air mass meter; 2. adapting the air values by multiplying the air values by an adaptation factor, and calculating the adaptation factor by: a. taking a substitute air value from a substitute performance graph, multiplying the substitute air value by a temperature value, multiplying a reciprocal value of the multiplication by a measured value supplied by the air meter in the intake tube of the internal combustion engine to obtain a result, and subjecting the result to sliding averaging, at times when no pulsations are present; and b. using a lambda-control-average value as the adaptation factor and subjecting the adaptation factor to sliding averaging, at times when pulsations are present; and 3. controlling mixture preparation in the intake tube of the internal combustion engine by employing adapted air values as a signal to a fuel injector.
Claim 4
Independent Claim
171 words
A method for controlling mixture preparation in an intake tube of an internal combustion engine, which comprises the steps of: 1. measuring air values in an intake tube of an internal combustion engine with an air mass meter; 2. adapting the air values by multiplying the air values by an adaptation factor, and calculating the adaptation factor by: a. taking a substitute air value from a substitute performance graph, multiplying the substitute air value by a temperature value, multiplying a reciprocal value of the multiplication by a measured value supplied by the air meter in the intake tube of the internal combustion engine to obtain a result, and subjecting the result to sliding averaging, at times when no pulsations are present; and b. using a lambda-control-average value as the adaptation factor and subjecting the adaptation factor to sliding averaging, at times when pulsations are present; and 3. controlling mixture preparation in the intake tube of the internal combustion engine by employing adapted air values as a signal to a fuel injector.
Claim 5
Dependent Claim
43 words
The method according to claim 2, which comprises calculating the temperature factor by: adding 273K to the measured ambient temperature to obtain a sum; multiplying the reciprocal of the sum by 293K to obtain a total; and taking a root from the total.
Claim 6
Dependent Claim
27 words
The method according to claim 1, which comprises calculating no new adaptation factor if the internal combustion engine is in an operating range having an acceleration buildup.
Claim 7
Dependent Claim
27 words
The method according to claim 1, which comprises calculating no new adaptation factor if the internal combustion engine is in an operating range having a thrust reduction.
Claim 8
Dependent Claim
27 words
The method according to claim 1, which comprises calculating no new adaptation factor if the internal combustion engine is in an operating range having a run on.
Claim 9
Dependent Claim
36 words
The method according to claim 1, which comprises calculating no new adaptation factor if the internal combustion engine is in an operating range in which the measured air value is smaller than a predetermined minimum value.
Claim 10
Dependent Claim
27 words
The method according to claim 2, which comprises calculating no new adaptation factor if the internal combustion engine is in an operating range having an acceleration buildup.
Claim 11
Dependent Claim
27 words
The method according to claim 2, which comprises calculating no new adaptation factor if the internal combustion engine is in an operating range having a thrust reduction.
Claim 12
Dependent Claim
27 words
The method according to claim 2, which comprises calculating no new adaptation factor if the internal combustion engine is in an operating range having a run on.
Claim 13
Dependent Claim
36 words
The method according to claim 2, which comprises calculating no new adaptation factor if the internal combustion engine is in an operating range in which the measured air value is smaller than a predetermined minimum value.
Claim 14
Dependent Claim
54 words
The method according to claim 1, which comprises modifying the adaptation factor with a first load factor when the measured air value is smaller than a predetermined minimum value, and modifying the adaptation factor with a second load factor when the measured air value is at least as large as a predetermined minimum value.
Claim 15
Dependent Claim
54 words
The method according to claim 2, which comprises modifying the adaptation factor with a first load factor when the measured air value is smaller than a predetermined minimum value, and modifying the adaptation factor with a second load factor when the measured air value is at least as large as a predetermined minimum value.
Claim 16
Dependent Claim
45 words
The method according to claim 1, which comprises carrying out the sliding averaging of the adaptation factor according to a formula AFM=AF.sub.(n-1) * (1-MITKO)+AF.sub.(n) * MITKO, wherein AF is the adaptation factor, and MITKO is a selectable average constant having values between 0 and 1.
Claim 17
Dependent Claim
45 words
The method according to claim 2, which comprises carrying out the sliding averaging of the adaptation factor according to a formula AFM=AF.sub.(n-1) * (1-MITKO)+AF.sub.(n) * MITKO, wherein AF is the adaptation factor, and MITKO is a selectable average constant having values between 0 and 1.
Claim 18
Dependent Claim
39 words
The method according to claim 1, which comprises setting the adaptation factor to 1 during a new start and setting the adaptation factor to the last determined and stored value of the last engine operation during each further start.
Claim 19
Dependent Claim
39 words
The method according to claim 2, which comprises setting the adaptation factor to 1 during a new start and setting the adaptation factor to the last determined and stored value of the last engine operation during each further start.
Claim 20
Independent Claim
173 words
An apparatus for adapting air values to currently prevailing variables of state of ambient air for controlling mixture preparation in an intake tube of an internal combustion engine having an air meter connected to the air intake tube for supplying measured values, a substitute performance graph for supplying the air values, and a fuel injector for supplying fuel to the engine, the apparatus comprising: a processor unit being associated with an air meter, with a substitute performance graph and with a fuel injector and being programmed for: 1. adapting air values by multiplying the air values by an adaptation factor, and calculating the adaptation factor by: dividing a measured value supplied by the air meter in an intake tube of an internal combustion engine by an air value taken from the substitute performance graph and subjecting the adaptation factor to sliding averaging, at times when no pulsations are present; and using a lambda-control-average value as the adaptation factor and subjecting the adaptation factor to sliding averaging, at times when pulsations are present; and
Claim 21
Independent Claim
173 words
An apparatus for adapting air values to currently prevailing variables of state of ambient air for controlling mixture preparation in an intake tube of an internal combustion engine having an air meter connected to the air intake tube for supplying measured values, a substitute performance graph for supplying the air values, and a fuel injector for supplying fuel to the engine, the apparatus comprising: a processor unit being associated with an air meter, with a substitute performance graph and with a fuel injector and being programmed for: 1. adapting air values by multiplying the air values by an adaptation factor, and calculating the adaptation factor by: dividing a measured value supplied by the air meter in an intake tube of an internal combustion engine by an air value taken from the substitute performance graph and subjecting the adaptation factor to sliding averaging, at times when no pulsations are present; and using a lambda-control-average value as the adaptation factor and subjecting the adaptation factor to sliding averaging, at times when pulsations are present; and
Claim 22
Dependent Claim
24 words
controlling mixture preparation in the intake tube of the internal combustion engine by employing adapted air values as a signal to the fuel injector.
Claim 23
Dependent Claim
24 words
controlling mixture preparation in the intake tube of the internal combustion engine by employing adapted air values as a signal to the fuel injector.
Claim 24
Independent Claim
217 words
An apparatus for adapting air values to currently prevailing variables of state of ambient air for controlling mixture preparation in an intake tube of an internal combustion engine having an air meter connected to the air intake tube for supplying measured values, a substitute performance graph for supplying the air values, and a fuel injector for supplying fuel to the engine, the apparatus comprising: a processor unit being associated with an air meter, with a substitute performance graph and with a fuel injector and being programmed for: 1. adapting air values by multiplying the air values by an adaptation factor, and calculating the adaptation factor by: taking a substitute air value from the substitute performance graph, multiplying the substitute air value by a temperature value, multiplying a reciprocal value of the multiplication by a measured value supplied by the air meter in an intake tube of an internal combustion engine to obtain a result, and subjecting the result to sliding averaging, at times when no pulsations are present; and using a lambda-control-average value as the adaptation factor and subjecting the adaptation factor to sliding averaging, at times when pulsations are present; and 2. controlling mixture preparation in the intake tube of the internal combustion engine by employing adapted air values as a signal to the fuel injector.
Claim 25
Independent Claim
217 words
An apparatus for adapting air values to currently prevailing variables of state of ambient air for controlling mixture preparation in an intake tube of an internal combustion engine having an air meter connected to the air intake tube for supplying measured values, a substitute performance graph for supplying the air values, and a fuel injector for supplying fuel to the engine, the apparatus comprising: a processor unit being associated with an air meter, with a substitute performance graph and with a fuel injector and being programmed for: 1. adapting air values by multiplying the air values by an adaptation factor, and calculating the adaptation factor by: taking a substitute air value from the substitute performance graph, multiplying the substitute air value by a temperature value, multiplying a reciprocal value of the multiplication by a measured value supplied by the air meter in an intake tube of an internal combustion engine to obtain a result, and subjecting the result to sliding averaging, at times when no pulsations are present; and using a lambda-control-average value as the adaptation factor and subjecting the adaptation factor to sliding averaging, at times when pulsations are present; and 2. controlling mixture preparation in the intake tube of the internal combustion engine by employing adapted air values as a signal to the fuel injector.
References Cited (Backward Citations)
EP0087809A2
Cited
EP0275507A2
Cited
US4933863A
Cited
US4945883A
Cited
US5053968A
Cited
US5131372A
Cited
US5001643A
Cited
US4999781A
Cited
WO1991002225A1
Cited
US5243951A
Cited
DE4018776A1
Cited
US5158062A
Cited
US5404861A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-08-20 | 2000-02-19 | 2000-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-08-20 | 2004-02-19 | 2004-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-08-20 | 2008-02-19 | 2008-08-20 | $7700.00 | Window Closed / Lapsed |