US5539638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Virtual emissions monitor for automobile
Assignee: Rockwell Automation Technologies Inc
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Filing: 1993-11-05
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Granted: 1996-07-23
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Expires: 2013-11-05
Abstract
Abstract An internal combustion engine [(360)] is provided with a plurality of sensors to monitor the operation thereof with respect to various temperature measurements, pressure measurements, etc. A predictive model processor [(322)] is provided that utilizes model parameters stored in the memory [(324)] to predict from the sensor inputs a predicted emissions output. The model is trained with inputs provided by the sensor and an actual emissions sensor output. During operation, this predicted output on line [(326)] can be utilized to provide an alarm or to be stored in a history database in a memory [(328)]. Additionally, the internal combustion engine [(260)] can have the predicted emissions output thereof periodically checked to determine the accuracy of the model. This is effected by connecting the output of the engine to an external emissions sensor [(310)] and taking the difference between the actual output and the predicted output to provide an error. This is compared to a threshold and, if the error exceeds the threshold, the predictive model processor [(322)] can be placed in a training operation wherein new model parameters are generated. Additionally, retraining could take place external to the predictive model processor [(322)]. During runtime, a control network [(350)] can be utilized to predict control parameters for minimizing the emissions output.
Inventors
- 👤 James D. Keeler
- 👤 John P. Havener
- 👤 Devendra Godbole
- 👤 II Ralph B. Ferguson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:39
CPC Classifications
G; G05; G05B; G05B13/00; G05B13/02; G05B13/04; G05B13/048; F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1401; G01; G01N; G01N33/00; G01N33/0004; G01N33/0009; G01N33/0073; G01N33/0075; G05B13/0265; G05B13/027; G05B17/00; G05B17/02; G05B23/00; G05B23/02; G05B23/0205; G05B23/0218; G05B23/0243; G05B23/0254; G05B23/0259; G05B23/0267; G05B23/027; F02D2041/1433; G01N33/0027; G01N33/0031; G01N33/0034
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
157 words
A method for monitoring emissions in an internal combustion engine that emits noxious pollutants and provides a plurality of attached sensors for measuring select parameters of the engine operation as sensor output values, comprising the steps of: storing in a predictive model a representation of the combined engine and a standard external emissions monitor, the standard external emissions monitor operable to measure the noxious pollutants output by the engine, the predictive model having an output that provides a prediction of the output of the standard external emissions monitor as a predicted emissions value and operable to receive as inputs select ones of the sensor output values; inputting the select ones of the sensor output values to the predictive model; and predicting the output of the combined engine and external emissions monitor to provide an indication of the noxious pollutants output by the emissions monitor without requiring the standard external emissions monitor to be present on the engine.
Claim 2
Independent Claim
157 words
A method for monitoring emissions in an internal combustion engine that emits noxious pollutants and provides a plurality of attached sensors for measuring select parameters of the engine operation as sensor output values, comprising the steps of: storing in a predictive model a representation of the combined engine and a standard external emissions monitor, the standard external emissions monitor operable to measure the noxious pollutants output by the engine, the predictive model having an output that provides a prediction of the output of the standard external emissions monitor as a predicted emissions value and operable to receive as inputs select ones of the sensor output values; inputting the select ones of the sensor output values to the predictive model; and predicting the output of the combined engine and external emissions monitor to provide an indication of the noxious pollutants output by the emissions monitor without requiring the standard external emissions monitor to be present on the engine.
Claim 3
Dependent Claim
68 words
The method of claim 1 and further comprising: attaching an external emissions monitor substantially similar to the standard external emissions monitor to the engine; comparing the output of the external emissions monitor to the predicted emissions value of the predictive model; and adjusting the stored representation in the predictive model whenever the predicted emissions value exceeds the actual output of the external emissions monitor by a predetermined amount.
Claim 4
Dependent Claim
64 words
The method of claim 2, wherein the stored representation in the predictive model is generated by training the predictive model on a training set of data comprised of actual sensor data received from the output of the sensors associated with the select ones of the sensor output values, and actual measured emissions output data from the external emissions monitor when connected to the engine.
Claim 5
Dependent Claim
33 words
The method of claim 3, wherein the step of adjusting comprises retraining the predictive model on a new set of training data utilizing the external emissions monitor to provide the actual output data.
Claim 6
Dependent Claim
32 words
The method of claim 3, wherein the step of adjusting comprises offsetting the predicted emissions value of the predictive model by a predetermined amount to minimize the error below a predefined level.
Claim 7
Dependent Claim
32 words
The method of claim 1, and further comprising: comparing the predicted emissions value with an internal threshold value; and generating an alarm when the predicted emissions value exceeds the internal threshold value.
Claim 8
Dependent Claim
14 words
The method of claim 6, wherein the alarm is a light on a display.
Claim 9
Dependent Claim
49 words
The method of claim 6, and further comprising, storing a plurality of stored threshold values in a memory and selecting only one of the plurality of threshold values for the threshold value to utilize in the step of comparing, the step of selecting performed in accordance with predetermined criteria.
Claim 10
Dependent Claim
26 words
The method of claim 1, and further comprising, storing a history of the predicted emissions values output by the predictive model as a function of time.
Claim 11
Dependent Claim
16 words
The method of claim 8, and further comprising, downloading the stored history on a periodic basis.
Claim 12
Dependent Claim
46 words
The method of claim 1, and further comprising: determining if the select measured parameters are outside of acceptable limits in accordance with predetermined criteria; and substituting a known value for the sensor output values when it is determined that they are outside of the acceptable limits.
Claim 13
Dependent Claim
35 words
The method of claim 11, wherein the step of substituting comprises predicting from a past history of the measured sensor output values to be substituted, a predicted value, the predicted value comprising the known values.
Claim 14
Dependent Claim
19 words
The method of claim 12, wherein the past history is a function of the other measured sensor output values.
Claim 15
Dependent Claim
116 words
The method of claim 11, wherein the step of determining comprises: providing a sensor validation predictive network having as an input the actual sensor values of the engine, the sensor validation predictive network having associated therewith a stored representation of each of the actual sensor output values as a function of the other of the actual sensor output values to provide on the output thereof a predicted sensor output value for each of the actual sensor values input thereto; predicting with the sensor validation predictive network the predicted sensor output value; and comparing each of the differences of the input actual sensor output values in the predictive sensor output values with predetermined limits for those differences.
Claim 16
Dependent Claim
62 words
The method of claim 1, and further comprising: comparing the predicted emissions value output by the predictive model with a desired emissions value; providing an emissions control system for modifying the operation of the engine; and controlling the emissions control system to operate in such a manner as to reduce any error between the predicted emissions value and the desired emissions value.
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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) | 1999-07-23 | 2000-01-22 | 2000-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-07-23 | 2004-01-22 | 2004-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-07-23 | 2008-01-22 | 2008-07-23 | $7700.00 | Window Closed / Lapsed |