US4528962A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for lambda regulation in an internal combustion engine
Assignee: Robert Bosch GmbH
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Filing: 1984-08-24
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Granted: 1985-07-16
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Expires: 2004-08-24
Abstract
Abstract A method and an apparatus for lambda regulation are proposed which provide an optimizing of the integrator inclination in accordance with the time elapsed following a switching process of the lambda sensor. The processable time can adjust itself to the rpm of the internal combustion engine. Minimum and maximum values, at least, of the integrator inclination are efficaciously dependent on rpm and/or load. It is furthermore provided that fuel quantity values be determined during quasi-stationary operating states via an average-value formation of minimum and maximum correction values. In addition to a possible hardware realization, a computer realization having a learning regulation system is also proposed.
Inventors
- 👤 Werner Auth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 04:37
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1477; F02D41/1482
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
119 words
A method for lambda regulation in a lambda regulator of an internal combustion engine having an integrator in which the regulating data is controlled between at least two switchover periods of a lambda sensor in accordance with operating parameters such as load, rpm and time, comprising the steps of, continuously optimizing the integrator slope of the lambda regulator according to at least a time-dependent function wherein the integrator slope is dependent upon at least one of an integrator slope during a previous switchover period prior to the last switchover period of said lambda sensor and the time period of a previously elapsed switchover period prior to the last switchover period of said lambda sensor, and switching over said integrator.
Claim 2
Independent Claim
119 words
A method for lambda regulation in a lambda regulator of an internal combustion engine having an integrator in which the regulating data is controlled between at least two switchover periods of a lambda sensor in accordance with operating parameters such as load, rpm and time, comprising the steps of, continuously optimizing the integrator slope of the lambda regulator according to at least a time-dependent function wherein the integrator slope is dependent upon at least one of an integrator slope during a previous switchover period prior to the last switchover period of said lambda sensor and the time period of a previously elapsed switchover period prior to the last switchover period of said lambda sensor, and switching over said integrator.
Claim 3
Dependent Claim
29 words
A method as defined by claim 1, wherein the integrator inclination is varied after the elapse of a predetermined period of time following one switching process of the sensor.
Claim 4
Dependent Claim
22 words
A method as defined by claim 1, wherein the period of time depends on a predetermined number of revolutions of the engine.
Claim 5
Dependent Claim
27 words
A method as defined by claim 1, further comprising the steps of, forming an average-value formation of correction values following the attainment of the least integrator inclination.
Claim 6
Dependent Claim
45 words
A method as defined by claim 4, further comprising the step of shutting off the lambda regulation following the attainment of the minimum permissible integrator inclination, whereby the control value adjusts itself to at least one of the average value and a value derived therefrom.
Claim 7
Dependent Claim
22 words
A method as defined by claim 5 wherein said corrected characteristic curve values are stored for use with a learning regulating system.
Claim 8
Dependent Claim
23 words
A method as defined by claim 4, wherein by means of the averaged correction values engine operating characteristic curve values are additively corrected.
Claim 9
Dependent Claim
23 words
A method as defined by claim 4, wherein by means of the averaged correction values engine operating characteristic curve values are multiplicatively corrected.
Claim 10
Dependent Claim
22 words
A method as defined by claim 8 wherein said corrected characteristic curve values are stored for use with a learning regulating system.
Claim 11
Dependent Claim
142 words
A lambda regulator having an integrator for performing the lambda regulation in an internal combustion engine having a fuel metering system which can be controlled electrically and sensors at least for the load, rpm and exhaust gas compostion, comprising, a sensor-signal evaluation circuit means responsive to an exhaust gas sensor; means for detecting the period of time of at least one of: the time period following one switching process of said exhaust gas sensor and the time period between sequential switchover periods of said exhaust gas sensor prior to the last switchover period of said exhaust gas sensor, and means for controlling in accordance with at least one of the duration of said time period and the I component during a previous switchover period prior to the last switchover period of said exhaust gas sensor the I component of the lambda regulator.
Claim 12
Dependent Claim
142 words
A lambda regulator having an integrator for performing the lambda regulation in an internal combustion engine having a fuel metering system which can be controlled electrically and sensors at least for the load, rpm and exhaust gas compostion, comprising, a sensor-signal evaluation circuit means responsive to an exhaust gas sensor; means for detecting the period of time of at least one of: the time period following one switching process of said exhaust gas sensor and the time period between sequential switchover periods of said exhaust gas sensor prior to the last switchover period of said exhaust gas sensor, and means for controlling in accordance with at least one of the duration of said time period and the I component during a previous switchover period prior to the last switchover period of said exhaust gas sensor the I component of the lambda regulator.
Claim 13
Dependent Claim
33 words
An apparatus as defined by claim 10 further comprising, integrator means for increasing the integration constant of said lambda regulator with increasing duration of said period of time following a sensor signal change.
Claim 14
Dependent Claim
35 words
An apparatus as defined by claim 11, wherein the detecting means comprises a means for storing correction values and a means for counting said values, whereby the number of said values determines the integrator slope.
Claim 15
Dependent Claim
16 words
An apparatus as defined by claim 12, wherein initial values of said counting values are variable.
Claim 16
Dependent Claim
32 words
An apparatus as defined by claim 12, wherein said means for storing values forms the average values between minimum and maximum correction values, whereby the average values control in quasi-stationary operating states.
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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) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |