US3782346A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Intake system for internal combustion engine
Assignee: Mazda Motor Corp
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Filing: 1971-03-29
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Granted: 1974-01-01
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Expires: 1991-03-29
Abstract
Abstract An intake system for an internal combustion engine which is effective to maintain the air-fuel mixture ratio at an appropriate value even when the engine is decelerated, so that complete combustion of the air-fuel mixture can be achieved with substantial elimination of noxious unburned compounds normally present in an exhaust gas emerged from the exhaust system of the engine. In addition, since complete combustion can be achieved, the occurrence of an after-burning in the exhaust system can be advantageously prevented.
Inventors
- 👤 Y Tatsutomi
- 👤 S Yoshimura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:39
CPC Classifications
F; F02; F02M; F02M7/00; F02M7/12; F02M7/133; F02M23/00; F02M23/04; F02M23/08; F02M23/09; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
215 words
An air-fuel intake arrangement for an internal combustion engine comprising: an air fuel intake channel leading to combustion chamber means of an engine, a carburetor for controlling the air-fuel mixture in said intake channel, said carburetor including a throttle valve arranged in said intake channel, primary air supplying means for supplying primary air to said intake channel during engine deceleration conditions, said primary air supplying means including a primary air passage with a primary air valve means arranged therein, said primary air passage having one end communicated with an air source and the other end open to the interior of said intake channel at a position downstream of said throttle valve, and additional fuel supplying means for supplying additional fuel to said intake channel during certain engine operating conditions, said additional fuel supplying means including a fuel passage with a fuel passage valve means arranged therein, said fuel passage having one end communicated with a fuel source and the other end communicating with said intake channel at a position downstream of said throttle valve, said fuel passage valve means including means operable to open said fuel passage during deceleration of said engine only whEn one of the engine speed and the speed of a vehicle powered by said engine is smaller than a predetermined value.
Claim 2
Dependent Claim
215 words
An air-fuel intake arrangement for an internal combustion engine comprising: an air fuel intake channel leading to combustion chamber means of an engine, a carburetor for controlling the air-fuel mixture in said intake channel, said carburetor including a throttle valve arranged in said intake channel, primary air supplying means for supplying primary air to said intake channel during engine deceleration conditions, said primary air supplying means including a primary air passage with a primary air valve means arranged therein, said primary air passage having one end communicated with an air source and the other end open to the interior of said intake channel at a position downstream of said throttle valve, and additional fuel supplying means for supplying additional fuel to said intake channel during certain engine operating conditions, said additional fuel supplying means including a fuel passage with a fuel passage valve means arranged therein, said fuel passage having one end communicated with a fuel source and the other end communicating with said intake channel at a position downstream of said throttle valve, said fuel passage valve means including means operable to open said fuel passage during deceleration of said engine only whEn one of the engine speed and the speed of a vehicle powered by said engine is smaller than a predetermined value.
Claim 3
Dependent Claim
30 words
An arrangement according to claim 1, wherein said fuel passage valve means includes means for opening said fuel passage only when the engine speed is smaller than a predetermined value.
Claim 4
Dependent Claim
36 words
An arrangement according to claim 1, wherein said fuel passage valve means includes means for opening said fuel passage only when the speed of a vehicle powered by said engine is smaller than a predetermined value.
Claim 5
Dependent Claim
63 words
An arrangement according to claim 2, wherein said other end of said fuel passage opens into said primary air passage at a position in said primary air passage upstream of said intake channel with respect to said primary air passage, whereby fuel is intermixed with said primary air in said primary passage prior to flow of said primary air into said intake channel.
Claim 6
Dependent Claim
60 words
An arrangement according to claim 4, wherein the opening of said fuel passage into said primary air passage is upstream of the position in said primary air passage where said primary air valve means controls the opening of said primary air passage, whereby flow of fuel to said intake channel is precluded when said primary air valve means is closed.
Claim 7
Dependent Claim
34 words
An arrangement according to claim 5, wherein said primary air valve means includes means responsive to negative pressure in said intake channel for opening said primary air passage with respect to said intake channel.
Claim 8
Dependent Claim
34 words
An arrangement according to claim 2, wherein said primary air valve means includes means responsive to negative pressure in said intake channel for opening said primary air passage with respect to said intake channel.
Claim 9
Dependent Claim
75 words
An arrangement according to claim 5, wherein said primary air passage includes a portion constructed as a venturi tube member having a diametrically reduced section adjoined by a diverging section extending in the direction of said intake channel, and wherein the opening of said fuel passage into said primary air passage is at said reduced section, whereby said additional fuel and primary air mixture is fed to said intake channel at a relatively high speed.
Claim 10
Dependent Claim
75 words
An arrangement according to claim 4, wherein said primary air passage includes a portion constructed as a venturi tube member having a diametrically reduced section adjoined by a diverging section extending in the direction of said intake channel, and wherein the opening of said fuel passage into said primary air passage is at said reduced section, whereby said additional fuel and primary air mixture is fed to said intake channel at a relatively high speed.
Claim 11
Dependent Claim
63 words
An arrangement according to claim 3, wherein said other end of said fuel passage opens into said primary air passage at a position in said primary air passage upstream of said intake channel with respect to said primary air passage, whereby fuel is intermixed with said primary air in said primary passage prior to flow of said primary air into said intake channel.
Claim 12
Dependent Claim
60 words
An arrangement according to claim 10, wherein the opening of said fuel passage into said primary air passage is upstream of the position in said primary air passage where said primary air valve means controls the opening of said primary air passage, whereby flow of fuel to said intake channel is precluded when said primary air valve means is closed.
Claim 13
Dependent Claim
34 words
An arrangement according to claim 11, wherein said primary air valve means includes means responsive to negative pressure in said intake channel for opening said primary air passage with respect to said intake channel.
Claim 14
Dependent Claim
75 words
An arrangement according to claim 11, wherein said primary air passage includes a portion constructed as a venturi tube member having a diametrically reduced section adjoined by a diverging section extending in the direction of said intake channel, and wherein the opening of said fuel passage into said primary air passage is at said reduced section, whereby said additional fuel and primary air mixture is fed to said intake channel At a relatively high speed.
Claim 15
Dependent Claim
34 words
An arrangement according to claim 8, wherein said primary air valve means includes means responsive to negative pressure in said intake channel for opening said primary air passage with respect to said intake channel.
Claim 16
Dependent Claim
34 words
An arrangement according to claim 13, wherein said primary air valve means includes means responsive to negative pressure in said intake channel for opening said primary air passage with respect to said intake channel.
Claim 17
Dependent Claim
88 words
An arrangement according to claim 6, wherein said primary air valve means includes a closing member facing inwardly into said intake channel, and biasing means for normally maintaining said closing member in position to close said primary air passage with respect to said intake channel, the biasing means and closing member being so configured that increased negative pressure in said intake channel occurring during deceleration causes movement of said closing member against the force of said biasing means to open said primary air passage to said intake channel.
Claim 18
Dependent Claim
88 words
An arrangement according to claim 7, wherein said primary air valve means includes a closing member facing inwardly into said intake channel, and biasing means for normally maintaining said closing member in position to close said primary air passage with respect to said intake channel, the biasing means and closing member being so configured that increased negative pressure in said intake channel occurring during deceleration causes movement of said closing member against the force of said biasing means to open said primary air passage to said intake channel.
Claim 19
Dependent Claim
88 words
An arrangement according to claim 14, wherein said primary air valve means includes a closing member facing inwardly into said intake channel, and biasing means for normally maintaining said closing member in position to close said primary air passage with respect to said intake channel, the biasing means and closing member being so configured that increased negative pressure in said intake channel occurring during deceleration causes movement of said closing member against the force of said biasing means to open said primary air passage to said intake channel.
Claim 20
Dependent Claim
88 words
An arrangement according to claim 15, wherein said primary air valve means includes a closing member facing inwardly into said intake channel, and biasing means for normally maintaining said closing member in position to close said primary air passage with respect to said intake channel, the biasing means and closing member being so configured that increased negative pressure in said intake channel occurring during deceleration causes movement of said closing member against the force of said biasing means to open said primary air passage to said intake channel.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-31 | 1977-07-02 | 1978-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-31 | 1981-07-02 | 1982-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-31 | 1985-07-02 | 1986-01-01 | $7700.00 | Window Closed / Lapsed |