Patent US3930478A successfully refreshed from Google Patents.
US3930478A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for the detoxication of exhaust gases
Assignee: Robert Bosch GmbH
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Filing: 1973-09-12
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Granted: 1976-01-06
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Expires: 1993-09-12
Abstract
Abstract An exhaust gas-detoxicating system for an externally ignited internal combustion engine having at least one air intake suction tube wherein a fuel/air mixture is produced by metering into said tube fuel from a fuel metering device, and wherein the fuel air mixture, before its entry into a cylinder of the engine, can be deviated through a heated-up bypass of at least one suction tube by means of a flap valve being disposed in said suction tube and being controllable in dependence on characteristic engine data, is improved by providing, in combination, measuring means for detecting the amount of air flowing through the said suction tube and means for controlling the flap valve in dependence on the detected air amount. Preferably, the measuring means comprise a Venturi constriction in the suction tube, a pneumatic-mechanical converter, and means actuating the converter in dependence on the pressure difference between the air pressure upstream, and the air pressure in the Venturi constriction at the narrowest cross sectional area of the latter.
Inventors
- 👤 Johannes Brettshneider
- 👤 Heinrich Knapp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:01
CPC Classifications
F; F02; F02M; F02M31/00; F02M31/02; F02M31/04; F02M31/06; F02M31/08; F02M31/0805; F02M7/00; F02M7/12; F02M7/14; F02M7/16; F02M7/17; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
187 words
In an exhaust gas-detoxicating system for an externally ignited internal combustion engine having at least one air intake suction tube in which a fuel/air mixture is produced by metering into said suction tube fuel from a fuel metering device, and wherein the fuel/air mixture, before its entry into a cylinder of said engine, can be deviated through a heated-up bypass of at least one such suction tube by means of a flap valve being disposed in said suction tube and being controllable in dependence on characteristic engine data, the improvement comprising, in combination measuring means for detecting the amount of air flowing through said suction tube and a pneumatic-mechanical converter for controlling said flap valve in dependence on the detected air amount and independently of engine load, wherein said measuring means comprise a Venturi constriction provided in said suction tube, and means for actuating said pneumatic-mechanical converter in dependence on the pressure difference between the air pressure in the narrowest cross-sectional area of said Venturi constriction and the air pressure upstream of said measuring means, and wherein said pneumatic-mechanical converter is connected directly to the flap valve.
Claim 2
Dependent Claim
187 words
In an exhaust gas-detoxicating system for an externally ignited internal combustion engine having at least one air intake suction tube in which a fuel/air mixture is produced by metering into said suction tube fuel from a fuel metering device, and wherein the fuel/air mixture, before its entry into a cylinder of said engine, can be deviated through a heated-up bypass of at least one such suction tube by means of a flap valve being disposed in said suction tube and being controllable in dependence on characteristic engine data, the improvement comprising, in combination measuring means for detecting the amount of air flowing through said suction tube and a pneumatic-mechanical converter for controlling said flap valve in dependence on the detected air amount and independently of engine load, wherein said measuring means comprise a Venturi constriction provided in said suction tube, and means for actuating said pneumatic-mechanical converter in dependence on the pressure difference between the air pressure in the narrowest cross-sectional area of said Venturi constriction and the air pressure upstream of said measuring means, and wherein said pneumatic-mechanical converter is connected directly to the flap valve.
Claim 3
Dependent Claim
25 words
The improvement as described in claim 1, further comprising means for passing hot exhaust gas from said engine through said bypass, thereby heating the latter.
Claim 4
Dependent Claim
25 words
The improvement as described in claim 1, wherein said heatable bypass is common to at least two suction tubes acting in parallel in said engine.
Claim 5
Dependent Claim
189 words
In an exhaust gas-detoxicating system for an externally ignited internal combustion engine having at least one air intake suction tube in which a fuel/air mixture is produced by metering into said suction tube fuel from a fuel metering device, and wherein the fuel/air mixture, before its entry into a cylinder of said engine, can be deviated through a heated-up bypass of at least one such suction tube by means of a flap valve being disposed in said suction tube and being controllable in dependence on characteristic engine data, the improvement comprising, in combination measuring means for detecting the amount of air flowing through said suction tube independently of engine load, and control means connected between the measuring means and the flap valve for controlling said flap valve in dependence on the detected air amount, wherein said measuring means is adapted for emitting a mechanical regulating signal and said control means comprises a converter connected to the flap valve, and electrical means for detecting the mechanical signal, generating a comparable electrical signal and applying said electrical signal to said converter which controls thereby the relative position of the flap valve.
Claim 6
Dependent Claim
189 words
In an exhaust gas-detoxicating system for an externally ignited internal combustion engine having at least one air intake suction tube in which a fuel/air mixture is produced by metering into said suction tube fuel from a fuel metering device, and wherein the fuel/air mixture, before its entry into a cylinder of said engine, can be deviated through a heated-up bypass of at least one such suction tube by means of a flap valve being disposed in said suction tube and being controllable in dependence on characteristic engine data, the improvement comprising, in combination measuring means for detecting the amount of air flowing through said suction tube independently of engine load, and control means connected between the measuring means and the flap valve for controlling said flap valve in dependence on the detected air amount, wherein said measuring means is adapted for emitting a mechanical regulating signal and said control means comprises a converter connected to the flap valve, and electrical means for detecting the mechanical signal, generating a comparable electrical signal and applying said electrical signal to said converter which controls thereby the relative position of the flap valve.
Claim 7
Dependent Claim
25 words
The improvement as described in claim 4, further comprising means for passing hot exhaust gas from said enging through said bypass, thereby heating the latter.
Claim 8
Dependent Claim
25 words
The improvement as described in claim 4, wherein said heatable bypass is common to at least two suction tubes acting in parallel in said engine.
Claim 9
Dependent Claim
62 words
The improvement as described in claim 4, wherein said converter comprises a servo-motor, and wherein said electrical means comprises an inductive motion pickup and an amplifier, said pickup serving to detect the mechanical signal and generating the electrical signal which is amplified by the amplifier and delivered to the servo-motor to actuate said servo-motor in controlling the position of the flap valve.
Claim 10
Dependent Claim
24 words
The improvement as described in claim 1, wherein said suction tube comprises means for varying the narrowest cross sectional area of said Venturi constriction.
Claim 11
Dependent Claim
18 words
The improvement as described in claim 4, wherein said measuring means is associated with said fuel metering device.
Claim 12
Dependent Claim
42 words
The improvement as described in claim 4, wherein said measuring means comprises a carburetor piston and wherein the displacement of said piston in response to the detected amount of air serves as a regulating distance which is proportional to the mechanical signal.
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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) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |