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US3919983A
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Method and apparatus repetitively controlling the composition of exhaust emissions from internal combustion engines, in predetermined intervals
Assignee: Robert Bosch GmbH
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Filing: 1973-09-12
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Granted: 1975-11-18
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Expires: 1993-09-12
Abstract
Abstract Certain intervals are determined in which output signals from an exhaust gas sensing device are sensed, and then applied to a control circuit, to control the fuel supply system (carburetor, or fuel injection system) in such a direction that a predetermined ratio of fuel and air is being supplied to the engine to provide exhaust gases of predetermined composition. The intervals are determined by a logic circuit which has applied thereto engine operating parameters such as operating time of the engine after having been started, engine speed, engine power condition (idling, or supplying power), engine temperature, or the like.
Inventors
- 👤 Josef Wahl
- 👤 Peter Jurgen Schmidt
- 👤 Richard Zechnall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:09
CPC Classifications
F; F02; F02D; F02D9/00; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1473; F02D41/1474; F02D41/24; F02D41/2406; F02D41/2425; F02D41/2429; F02D41/2451; F02D41/2454; F02D2250/00; F02D2250/14; F02D2700/00; F02D2700/09
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
145 words
Method of controlling the composition of the exhaust gases from internal cOmbustion engines, including the step of controlling the relative proportion ( lambda ) of air and fuel being applied to the engine; sensing operating parameters of the engine, comprising at least one of: operating time of the engine upon starting, after having been stopped; engine speed; engine operation under idling, or power supplying condition; engine temperature; sensing composition of the exhaust gases and providing an exhaust output signal representative thereof; sensing if a predetermined operating condition of the engine prevails for a predetermined time limit; comparing the exhaust sensed signal with a reference if said operating conditions persisted beyond said predetermined time limit; generating a timing signal; and controlling said relative proportion ( lambda ) of air and fuel in accordance with sensed composition, as represented by the exhaust signal, during said timing signal.
Claim 2
Dependent Claim
145 words
Method of controlling the composition of the exhaust gases from internal cOmbustion engines, including the step of controlling the relative proportion ( lambda ) of air and fuel being applied to the engine; sensing operating parameters of the engine, comprising at least one of: operating time of the engine upon starting, after having been stopped; engine speed; engine operation under idling, or power supplying condition; engine temperature; sensing composition of the exhaust gases and providing an exhaust output signal representative thereof; sensing if a predetermined operating condition of the engine prevails for a predetermined time limit; comparing the exhaust sensed signal with a reference if said operating conditions persisted beyond said predetermined time limit; generating a timing signal; and controlling said relative proportion ( lambda ) of air and fuel in accordance with sensed composition, as represented by the exhaust signal, during said timing signal.
Claim 3
Dependent Claim
43 words
Method according to claim 1 wherein an exhaust sensing element (15) is provided, further comprising the step of exposing said sensing element to the exhaust gases for a time period which is short with respect to the operating time of the combustion engine.
Claim 4
Dependent Claim
17 words
Method according to claim 2 wherein said exposing step is controlled by occurrence of said sensing signal.
Claim 5
Dependent Claim
27 words
Method according to claim 1 wherein an exhaust sensing element is provided, further comprising the step of continually exposing said sensing element (15) to the exhaust gases.
Claim 6
Dependent Claim
58 words
Method according to claim 1 wherein step of sensing an operating parameter of the engine comprises sensing that the engine is operating under idling conditions, has reached a predetermined temperature level, has a speed within a predetermined range, and that these conditions pertain for the first time upon repeated operation of the engine after it had been stopped.
Claim 7
Dependent Claim
165 words
Method of controlling the composition of the exhaust gases from internal combustion engines, including the step of controlling the relative proportion ( lambda ) of air and fuel being applied to the engine; generating an operating time signal having a limited time duration with respect to operating time of the engine, after starting of the engine subsequent to the engine having been stopped; sensing operating parameters of the engine, comprising at least one of: engine speed; engine operation under idling, or power supplying condition; engine temperature; providing an indication signal of at least one of said operating parameters having reached a predetermined value; sensing composition of the exhaust gases and providing an exhaust output signal representative thereof; and controlling the relative proportion of air and fuel in dependence on said exhaust output signal upon conjunction of occurrence of said timing signal and said indication signal, to change, if required, said relative proportion, and only during concurrent presence of the indication signal and said timing signal.
Claim 8
Dependent Claim
165 words
Method of controlling the composition of the exhaust gases from internal combustion engines, including the step of controlling the relative proportion ( lambda ) of air and fuel being applied to the engine; generating an operating time signal having a limited time duration with respect to operating time of the engine, after starting of the engine subsequent to the engine having been stopped; sensing operating parameters of the engine, comprising at least one of: engine speed; engine operation under idling, or power supplying condition; engine temperature; providing an indication signal of at least one of said operating parameters having reached a predetermined value; sensing composition of the exhaust gases and providing an exhaust output signal representative thereof; and controlling the relative proportion of air and fuel in dependence on said exhaust output signal upon conjunction of occurrence of said timing signal and said indication signal, to change, if required, said relative proportion, and only during concurrent presence of the indication signal and said timing signal.
Claim 9
Dependent Claim
44 words
Method according to claim 6, wherein an exhaust sensing element (15) is provided, further comprising the step of intermittently exposing said sensing element to the exhaust gases for a time period which is short with respect to the operating time of the combustion engine.
Claim 10
Dependent Claim
21 words
Method according to claim 7 wherein the time period of said exposing step is controlled by occurrence of said indication signal.
Claim 11
Dependent Claim
27 words
Method according to claim 6, wherein an exhaust sensing element is provided, further comprising the step of continually exposing said sensing element (15) to the exhaust gases.
Claim 12
Dependent Claim
58 words
Method according to claim 6, wherein the step of sensing operating parameters of the engine comprises sensing that the engine is operating under idling conditions, has reached a predetermined temperature level, has a speed within a predetermined range, and that these conditions pertain for the first time upon repeated operation of the engine after it had been stopped.
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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) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |