US5339680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System and method for sensing temperature
Assignee: Robert Bosch GmbH
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Filing: 1992-06-03
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Granted: 1994-08-23
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Expires: 2012-06-03
Abstract
Abstract A method for sensing the temperature of the air supplied to the combustion chambers of an internal combustion engine for the purpose of detecting air mass. Air temperature can be measured using an inexpensive detector having a transfer function exhibiting a delayed response. Dynamic performance is improved by applying to the detected temperature a temperature correction value that is obtained by applying a transfer function that is substantially the inverse of the transfer function of the temperature detector.
Inventors
- 👤 Bernhard Bronkal
- 👤 Wolfram Gerwing
- 👤 Hermann Grieshaber
- 👤 Manfred Birk
- 👤 Gerhard Engel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:17
CPC Classifications
G; G01; G01K; G01K13/00; G01K13/02; G01F; G01F15/00; G01F15/02; G01F15/04; G01F15/043; G01F15/046; F; F02; F02D; F02D2200/00; F02D2200/02; F02D2200/04; F02D2200/0414
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
110 words
A method of determining an amount of air flowing into an internal combustion engine, comprising the steps of: detecting the temperature of the air flowing into the engine through the use of a temperature detector having a first transfer function, and generating a detected temperature value based thereon; and applying a second transfer function to the detected temperature value for correcting the detected temperature value and for generating a corrected temperature value indicative of the amount of air flowing into the engine, wherein the first transfer function includes a transfer function of a time-delay element and the second transfer function includes a substantially reciprocal function of the first transfer function.
Claim 2
Independent Claim
110 words
A method of determining an amount of air flowing into an internal combustion engine, comprising the steps of: detecting the temperature of the air flowing into the engine through the use of a temperature detector having a first transfer function, and generating a detected temperature value based thereon; and applying a second transfer function to the detected temperature value for correcting the detected temperature value and for generating a corrected temperature value indicative of the amount of air flowing into the engine, wherein the first transfer function includes a transfer function of a time-delay element and the second transfer function includes a substantially reciprocal function of the first transfer function.
Claim 3
Dependent Claim
19 words
The method as recited in claim 1, wherein the second transfer function includes a transfer function of a differentiator.
Claim 4
Independent Claim
111 words
A method of determining an amount of air flowing into an internal combustion engine, comprising the steps of: detecting a temperature of the air flowing into the engine with the use of a temperature detector having a first transfer function, and generating a detected temperature value based thereon; determining a pressure of the air flowing into the internal combustion engine, and generating a simulation temperature value based thereon; generating a temperature correction value by applying a second transfer function to the simulation temperature value; and adding the temperature correction value to the detected temperature value for generating a corrected temperature value indicative of the amount of air flowing into the engine.
Claim 5
Independent Claim
111 words
A method of determining an amount of air flowing into an internal combustion engine, comprising the steps of: detecting a temperature of the air flowing into the engine with the use of a temperature detector having a first transfer function, and generating a detected temperature value based thereon; determining a pressure of the air flowing into the internal combustion engine, and generating a simulation temperature value based thereon; generating a temperature correction value by applying a second transfer function to the simulation temperature value; and adding the temperature correction value to the detected temperature value for generating a corrected temperature value indicative of the amount of air flowing into the engine.
Claim 6
Dependent Claim
20 words
The method as recited in claim 3, wherein the sum of the first and second transfer functions is approximately one.
Claim 7
Dependent Claim
20 words
The method as recited in claim 3, wherein the first transfer function includes a transfer function of a time-delay element.
Claim 8
Dependent Claim
19 words
The method as recited in claim 3, wherein the second transfer function includes a transfer function of a differentiator.
Claim 9
Dependent Claim
19 words
The method as recited in claim 3, wherein the simulation temperature value is based on an outside air pressure.
Claim 10
Dependent Claim
22 words
The method as recited in claim 3, wherein the step of generating the simulation temperature value includes using an engine characteristics map.
Claim 11
Dependent Claim
21 words
The method as recited in claim 3, wherein the step of generating the simulation temperature value includes following a characteristic curve.
Claim 12
Dependent Claim
25 words
The method as recited in claim 9, wherein the characteristic curve corresponds to a derivative of the simulation temperature with respect to the air pressure.
Claim 13
Dependent Claim
50 words
The method as recited in claim 3, wherein the method further comprises the steps of applying a third transfer function to the detected temperature value, generating a third transfer function output value based thereon, and choosing the larger of the corrected temperature value and the third transfer function output value.
Claim 14
Dependent Claim
50 words
The method as recited in claim 11, wherein the method further comprises the steps of adding the third transfer function output value to the detected temperature value, generating a further corrected temperature value based thereon, and choosing the larger of the corrected temperature value and the further corrected temperature value.
Claim 15
Dependent Claim
43 words
The method as recited in claim 3, wherein the method further comprises a step of formulating the temperature of the air flowing into the engine based on an outside air temperature, a rotational frequency of the engine, and the pressure of the air.
Claim 16
Dependent Claim
15 words
The method as recited in claim 13, wherein a characteristic map performs the formulating step.
Claim 17
Dependent Claim
29 words
The method as recited in claim 3, wherein the method further comprises the step of applying a correction value to the detected temperature value when the engine is restarted.
Claim 18
Dependent Claim
24 words
The method as recited in claim 15, wherein the method further comprises a step of subtracting the correction value from the simulation temperature value.
Claim 19
Dependent Claim
34 words
The method as recited in claim 15, wherein the method further comprises a step of selecting the correction value from a plurality of possible correction values based upon the temperature of the temperature detector.
Claim 20
Dependent Claim
26 words
The method as recited in claim 15, wherein the correction value is applied only when the temperature of the temperature detector exceeds a predetermined threshold value.
Claim 21
Dependent Claim
31 words
The method as recited in claim 15, wherein the correction value depends upon a change in the pressure of the air and a change in the rotational frequency of the engine.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-08-22 | 1998-02-21 | 1998-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-08-22 | 2002-02-21 | 2002-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-08-22 | 2006-02-21 | 2006-08-23 | $7700.00 | Window Closed / Lapsed |