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US5239975A
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Method and arrangement for shifting the lambda mean value
Assignee: Robert Bosch GmbH
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Filing: 1992-10-19
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Granted: 1993-08-31
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Expires: 2012-10-19
Abstract
Abstract The invention is directed to a method of shifting the lambda value to that value at which a control in time average is effected with a two-point lambda control for an internal combustion engine. The method includes the steps of: forming a control deviation between the current value of a variable, which indicates the lambda value of the engine exhaust gas, and a pregiven fixed value; integrating to form an output variable component with the integration being in the direction of higher integration values in the presence of a control deviation indicating a lean mixture, and in the direction of lower integration values in the presence of a control deviation indicating a rich mixture; temporarily stopping the integration when there is a sign change of the control deviation to that sign which belongs to the desired lambda value shift, the lambda value shift being defined as a stop sign; utilizing an integration stop time span which is then always reset anew when the previous integration stop time span has run; and, permitting an integration stop over the entire integration stop time span when the output variable lies in that value range which belongs to the shift of the lambda mean value in the desired direction. The actual integration stop time span is provided only for the rich region of the control deviation. In this way, an unwanted shift of the lambda mean value in the lean direction does not occur with disturbances.
Inventors
- 👤 Georg Mallebrein
- 👤 Hans Rossmanith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:29
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1477; F02D41/1482
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
202 words
A method of shifting the lambda value to that value at which a control in time average is effected with a two-point lambda control for an internal combustion engine, the method comprising the steps of: forming a control deviation between the current value of a variable, which indicates the lambda value of the engine exhaust gas, and a pregiven fixed value; integrating to form an output variable component with the integration being in the direction of higher integration values (enrichment) in the presence of a control deviation indicating a lean mixture, and in the direction of lower integration values (leaning) in the presence of a control deviation indicating a rich mixture; temporarily stopping the integration when there is a sign change of the control deviation to that sign which belongs to the desired lambda value shift, said lambda value shift being defined as a stop sign; utilizing an integration stop time span which is then always reset anew when the previous integration stop time span has run; and, permitting an integration stop over the entire integration stop time span when the output variable lies in that value range which belongs to the shift of the lambda mean value in the desired direction.
Claim 2
Independent Claim
202 words
A method of shifting the lambda value to that value at which a control in time average is effected with a two-point lambda control for an internal combustion engine, the method comprising the steps of: forming a control deviation between the current value of a variable, which indicates the lambda value of the engine exhaust gas, and a pregiven fixed value; integrating to form an output variable component with the integration being in the direction of higher integration values (enrichment) in the presence of a control deviation indicating a lean mixture, and in the direction of lower integration values (leaning) in the presence of a control deviation indicating a rich mixture; temporarily stopping the integration when there is a sign change of the control deviation to that sign which belongs to the desired lambda value shift, said lambda value shift being defined as a stop sign; utilizing an integration stop time span which is then always reset anew when the previous integration stop time span has run; and, permitting an integration stop over the entire integration stop time span when the output variable lies in that value range which belongs to the shift of the lambda mean value in the desired direction.
Claim 3
Dependent Claim
66 words
The method of claim 1, comprising the further step of: stopping the integration always only for such subtime spans wherein the following conditions are fulfilled: the sum of the last subtime spans since the last integration stop time span has run and the current running subtime span has not yet reached the integration stop time; and, the sign of the control deviation is said stop sign.
Claim 4
Dependent Claim
91 words
The method of claim 1, comprising the further step of stopping the integration over the entire integration stop time span as soon as the sign of the control deviation changes to said stop sign and the output variable lies in that value range referred to the mean value of the output variable, the value range belonging to the shift of the lambda value in the desired direction; and, not stopping the integration as long as the output variable lies on the other side of the mean value of the output value.
Claim 5
Dependent Claim
233 words
An arrangement for shifting the lambda value to that value at which a control in time average is affected with a two-point lambda control for an internal combustion engine, the arrangement comprising: subtraction means for forming a control deviation between the current value of a variable indicating the lambda value of the exhaust gas and a pregiven fixed value; integration means for forming an output variable component with the integration taking place in the direction of higher integration values (enriching) when a control deviation is present indicating a lean mixture and with the integration taking place in the direction of lower integration values (leaning) when a control deviation is present indicating a rich mixture; and, means for temporarily stopping the integration for a change in sign of the control deviation to that sign which belongs to the desired lambda value shift defined as a stop sign; timing pulse generator means for setting an integration stop time span for the temporary stopping of the integration, the integration stop time span always being set anew when the previous integration stop time span has run; and, said integration means and said timing pulse generator means being so configured that an integration stop over the entire integration stop time span essentially only takes place when the output variable lies in that value range which belongs to the shift of the lambda mean value in the desired direction.
Claim 6
Dependent Claim
233 words
An arrangement for shifting the lambda value to that value at which a control in time average is affected with a two-point lambda control for an internal combustion engine, the arrangement comprising: subtraction means for forming a control deviation between the current value of a variable indicating the lambda value of the exhaust gas and a pregiven fixed value; integration means for forming an output variable component with the integration taking place in the direction of higher integration values (enriching) when a control deviation is present indicating a lean mixture and with the integration taking place in the direction of lower integration values (leaning) when a control deviation is present indicating a rich mixture; and, means for temporarily stopping the integration for a change in sign of the control deviation to that sign which belongs to the desired lambda value shift defined as a stop sign; timing pulse generator means for setting an integration stop time span for the temporary stopping of the integration, the integration stop time span always being set anew when the previous integration stop time span has run; and, said integration means and said timing pulse generator means being so configured that an integration stop over the entire integration stop time span essentially only takes place when the output variable lies in that value range which belongs to the shift of the lambda mean value in the desired direction.
Claim 7
Dependent Claim
71 words
The arrangement of claim 4, said integration means and said timing pulse generator means being so configured that the integration is always stopped only when for such subtime spans wherein the sum of last subtime spans since the last integration stop time span has run and the currently running subtime span has not yet reached the integration stop time span and the sign of the control deviation is said stop sign.
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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) | 1996-08-30 | 1997-03-01 | 1997-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-30 | 2001-03-01 | 2001-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-30 | 2005-03-01 | 2005-08-31 | $7700.00 | Window Closed / Lapsed |