Patent US5136842A successfully refreshed from Google Patents.
US5136842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for heating an exhaust gas catalytic converter
Assignee: Siemens AG
•
Filing: 1991-08-01
•
Granted: 1992-08-11
•
Expires: 2011-08-01
Abstract
Abstract A method for heating an exhaust gas catalyst of an internal combustion engine to an operating temperature during a warmup phase includes establishing an enriched mixture as a function of an engine operating state, with a control system. A sensor signal corresponding to a rich or lean mixture is output from a lambda sensor in an exhaust gas system. A quantity of secondary air is blown downstream of outlet valves and upstream of the lambda sensor in the exhaust gas system, from a secondary air pump. A feed quantity of the secondary air pump is pilot-controlled to a stoichiometric exhaust gas ratio, as a function of engine operating parameters, with the control system. The pilot control is corrected with a superimposed closed-loop control in accordance with the sensor signal, starting with operational readiness of the lambda sensor.
Inventors
- 👤 Erwin Achleitner
- 👤 Friedrich Kapphan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:23
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/22; F01N3/222; F01N11/00; F01N3/20; F01N3/2006; F01N9/00; F01N2550/00; F01N2550/14; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y02T10/40
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
135 words
A method for heating an exhaust gas catalyst of an internal combustion engine to an operating temperature during a warmup phase, which comprises: establishing an enriched mixture as a function of an engine operating state, with a control system; outputing a sensor signal corresponding to a rich or lean mixture, from a lambda sensor in an exhaust gas system; blowing a quantity of secondary air downstream of outlet valves and upstream of the lambda sensor in the exhaust gas system, from a secondary air pump; pilot-controlling a feed quantity of the secondary air pump to a stoichiometric exhaust gas ratio, as a function of engine operating parameters, with the control system; and correcting the pilot control with a superimposed closed-loop control in accordance with the sensor signal, starting with operational readiness of the lambda sensor.
Claim 2
Independent Claim
135 words
A method for heating an exhaust gas catalyst of an internal combustion engine to an operating temperature during a warmup phase, which comprises: establishing an enriched mixture as a function of an engine operating state, with a control system; outputing a sensor signal corresponding to a rich or lean mixture, from a lambda sensor in an exhaust gas system; blowing a quantity of secondary air downstream of outlet valves and upstream of the lambda sensor in the exhaust gas system, from a secondary air pump; pilot-controlling a feed quantity of the secondary air pump to a stoichiometric exhaust gas ratio, as a function of engine operating parameters, with the control system; and correcting the pilot control with a superimposed closed-loop control in accordance with the sensor signal, starting with operational readiness of the lambda sensor.
Claim 3
Dependent Claim
24 words
The method according to claim 1, which comprises selecting an enrichment factor of the mixture and an aspirated air mass as the operating parameters.
Claim 4
Dependent Claim
20 words
The method according to claim 1, which comprises representing load, rpm and temperature of the engine with the operating parameters.
Claim 5
Dependent Claim
15 words
The method according to claim 3, which comprises determining the load from an air mass.
Claim 6
Dependent Claim
16 words
The method according to claim 3, which comprises determining the load from a throttle valve angle.
Claim 7
Dependent Claim
16 words
The method according to claim 3, which comprises determining the load from an intake pipe pressure.
Claim 8
Dependent Claim
18 words
The method according to claim 2, which comprises controlling an electric pump serving as the secondary air pump.
Claim 9
Dependent Claim
18 words
The method according to claim 3, which comprises controlling an electric pump serving as the secondary air pump.
Claim 10
Dependent Claim
25 words
The method according to claim 2, which comprises fixing a feed quantity and controlling a valve of a pump serving as the secondary air pump.
Claim 11
Dependent Claim
25 words
The method according to claim 3, which comprises fixing a feed quantity and controlling a valve of a pump serving as the secondary air pump.
Claim 12
Dependent Claim
20 words
The method according to claim 9, which comprises driving the secondary air pump with a starter motor of the engine.
Claim 13
Dependent Claim
20 words
The method according to claim 10, which comprises driving the secondary air pump with a starter motor of the engine.
Claim 14
Dependent Claim
17 words
The method according to claim 1, which comprises diagnosing a secondary air supply with a control deviation.
Claim 15
Dependent Claim
27 words
The method according to claim 13, which comprises recognizing an error of the secondary air supply if the control deviation does not decrease after a control intervention.
Claim 16
Dependent Claim
58 words
The method according to claim 13, which comprises recognizing an error of the secondary air supply if a product of the aspirated air mass and the enrichment factor is lower than a threshold value, if the secondary air pump is then set to full power, and if a control deviation demanding a greater secondary air quantity still exists.
References Cited (Backward Citations)
US3949551A
Cited
DE2329539A1
Cited
US4043310A
Cited
JPS5314222A
Cited
JPS5322917A
Cited
US4231220A
Cited
US4363210A
Cited
US4375746A
Cited
US4383408A
Cited
US4385491A
Cited
US4376369A
Cited
US4364227A
Cited
JPS5827809A
Cited
JPS58210311A
Cited
DE3436609A1
Cited
US4593524A
Cited
DE3506235A1
Cited
US4664081A
Cited
JPS6158912A
Cited
JPS61247810A
Cited
JPS62174524A
Cited
US5012421A
Cited
JPS6318122A
Cited
US4913122A
Cited
JPH01116213A
Cited
JPH01227815A
Cited
US5014670A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-08-11 | 1996-02-10 | 1996-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-08-11 | 2000-02-10 | 2000-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-08-11 | 2004-02-10 | 2004-08-11 | $7700.00 | Window Closed / Lapsed |