US3685295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control system for purifying exhaust gas of an internal combustion engine
Assignee: Mazda Motor Corp
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Filing: 1970-03-10
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Granted: 1972-08-22
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Expires: 1990-03-10
Abstract
Abstract An air pump driven by the engine supplies secondary air through a conduit to the exhaust passage of the engine. The ignition system of the engine has the actuation of ignition means varied by delaying or cutting off ignition at low vehicle or engine speed but maintaining normal actuation of ignition means over a predetermined speed while supplying secondary air from the air pump to the exhaust passage within a predetermined low engine or vehicle speed but preventing the secondary air from reaching the exhaust passage above a predetermined speed.
Inventors
- 👤 Yasuo Tatsutomi
- 👤 Tomoo Takokoro
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:01
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/22; F01N3/222; F01N3/227; F02; F02P; F02P5/00; F02P5/04; F02P5/05; F02P5/10; F02P5/103; F02P5/106; Y; Y02; Y02A; Y02A50/00; Y02A50/20
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
224 words
A control system for purifying exhaust gas of an internal combustion engine comprising in combination: a. an exhaust passage; b. conduit means for delivering secondary air to said exhaust passage; c. ignition means for said engine; d. means capable of varying the actuation of said ignition means; e. means carried by said conduit means for allowing secondary air to be supplied to the exhaust passage below a predetermined engine speed and for preventing secondary air from reaching the exhaust passage above said predetermined speed; f. ignition timing control means for substantially varying the actuation of said ignition means at engine speeds below said predetermined engine speed and for maintaining normal actuation of said ignition means above said predetermined speed, wherein said ignition timing control means includes an engine speed responsive switch and wherein said engine includes a distributor having normal ignition timing contacts and delayed ignition timing contacts, and wherein said engine speed responsive switch acts to connect said delayed ignition timing contacts to said ignition means at speeds below said predetermined engine speed and to connect said normal ignition timing contacts to said ignition means at speeds above said predetermined engine speed; and g. means responsive to the idling operation of said engine for maintaining said ignition timing at the engine''s normal state regardless of the operation of said ignition timing control means.
Claim 2
Dependent Claim
224 words
A control system for purifying exhaust gas of an internal combustion engine comprising in combination: a. an exhaust passage; b. conduit means for delivering secondary air to said exhaust passage; c. ignition means for said engine; d. means capable of varying the actuation of said ignition means; e. means carried by said conduit means for allowing secondary air to be supplied to the exhaust passage below a predetermined engine speed and for preventing secondary air from reaching the exhaust passage above said predetermined speed; f. ignition timing control means for substantially varying the actuation of said ignition means at engine speeds below said predetermined engine speed and for maintaining normal actuation of said ignition means above said predetermined speed, wherein said ignition timing control means includes an engine speed responsive switch and wherein said engine includes a distributor having normal ignition timing contacts and delayed ignition timing contacts, and wherein said engine speed responsive switch acts to connect said delayed ignition timing contacts to said ignition means at speeds below said predetermined engine speed and to connect said normal ignition timing contacts to said ignition means at speeds above said predetermined engine speed; and g. means responsive to the idling operation of said engine for maintaining said ignition timing at the engine''s normal state regardless of the operation of said ignition timing control means.
Claim 3
Dependent Claim
79 words
The control system as claimed in claim 1 wherein said means for mAintaining normal ignition timing regardless of operation of said ignition timing control means during idling operation of the engine comprises a vacuum pressure switch fluid coupled to said engine carburetor intake wherein said vacuum pressure switch includes a multiple position switch mechanically coupled to a vacuum motor, whereby, during engine idling the pressure signal to said vacuum switch maintains an ignition circuit through said normal ignition contacts.
Claim 4
Dependent Claim
175 words
A control system for purifying exhaust gas for internal combustion engines comprising in combination: a. an exhaust passage; b. conduit means for delivering secondary air to said exhaust passage; c. ignition means for said engine including a distributor having delayed ignition timing contacts and normal ignition timing contacts; d. means capable of varying the actuation of said ignition timing means; e. means carried by said conduit means for allowing secondary air to be supplied to the exhaust passage below a predetermined engine speed and for preventing secondary air from reaching the exhaust passage above a predetermined speed; f. ignition timing control means for substantially varying the actuation of said ignition means at engine speeds below said predetermined engine speed and for maintaining normal actuation of said ignition means above said predetermined speed; and g. means for completing an ignition circuit through said delayed ignition timing contacts when said engine operates below said predetermined speed and means for completing an ignition circuit through said normal ignition timing contacts when said engine operates above said predetermined speed.
Claim 5
Dependent Claim
175 words
A control system for purifying exhaust gas for internal combustion engines comprising in combination: a. an exhaust passage; b. conduit means for delivering secondary air to said exhaust passage; c. ignition means for said engine including a distributor having delayed ignition timing contacts and normal ignition timing contacts; d. means capable of varying the actuation of said ignition timing means; e. means carried by said conduit means for allowing secondary air to be supplied to the exhaust passage below a predetermined engine speed and for preventing secondary air from reaching the exhaust passage above a predetermined speed; f. ignition timing control means for substantially varying the actuation of said ignition means at engine speeds below said predetermined engine speed and for maintaining normal actuation of said ignition means above said predetermined speed; and g. means for completing an ignition circuit through said delayed ignition timing contacts when said engine operates below said predetermined speed and means for completing an ignition circuit through said normal ignition timing contacts when said engine operates above said predetermined speed.
Claim 6
Dependent Claim
163 words
A control system for purifying exhaust gas of an internal combustion engine comprising in combination: a. an exhaust passage; b. conduit means for delivering secondary air to said exhaust passage; c. ignition means for said engine including first and second ignition plugs; d. means capable of varying the actuation of said ignition means; e. means carried by said conduit means for allowing secondary air to be supplied to the exhaust passage below a predetermined engine speed and for preventing secondary air from reaching the exhaust passage above said predetermined speed; and f. ignition timing control means for substantially varying the actuation of said ignition means at engine speeds below said predetermined engine speed and for maintaining normal actuation of said ignition means above said predetermined speed, said ignition timing control means including means for terminating the firing of said first plug after said engine reaches a predetermined speed and for maintaining the firing of said second plug throughout the range of engine speeds.
Claim 7
Dependent Claim
163 words
A control system for purifying exhaust gas of an internal combustion engine comprising in combination: a. an exhaust passage; b. conduit means for delivering secondary air to said exhaust passage; c. ignition means for said engine including first and second ignition plugs; d. means capable of varying the actuation of said ignition means; e. means carried by said conduit means for allowing secondary air to be supplied to the exhaust passage below a predetermined engine speed and for preventing secondary air from reaching the exhaust passage above said predetermined speed; and f. ignition timing control means for substantially varying the actuation of said ignition means at engine speeds below said predetermined engine speed and for maintaining normal actuation of said ignition means above said predetermined speed, said ignition timing control means including means for terminating the firing of said first plug after said engine reaches a predetermined speed and for maintaining the firing of said second plug throughout the range of engine speeds.
Claim 8
Dependent Claim
191 words
A control system for purifying exhaust gas for an internal combustion engine comprising in combination: a. an exhaust passage; b. conduit means for delivering secondary air to said exhaust passage; c. ignition means for said engine including first and second ignition plugs; d. means capable of varying the actuation of said ignition means; e. means carried by said conduit means for allowing secondary air to be supplied to the exhaust passage below a predetermined engine speed and for preventing secondary air from reaching the exhaust passage above said predetermined speed; f. ignition timing control means for substantially varying the actuation of said engine means at engine speeds below said predetermined engine speed and for maintaining normal actuation of said ignition means above said predetermined speed, said ignition timing control means including means for terminating firing of said first plug after said engine reaches said predetermined speed and for maintaining firing of said second plug throughout the operation of said engine; and g. means responsive to the idling operation of said engine for maintaining said ignition timing at the engine''s normal state regardless of the operation of said ignition timing control means.
Claim 9
Dependent Claim
191 words
A control system for purifying exhaust gas for an internal combustion engine comprising in combination: a. an exhaust passage; b. conduit means for delivering secondary air to said exhaust passage; c. ignition means for said engine including first and second ignition plugs; d. means capable of varying the actuation of said ignition means; e. means carried by said conduit means for allowing secondary air to be supplied to the exhaust passage below a predetermined engine speed and for preventing secondary air from reaching the exhaust passage above said predetermined speed; f. ignition timing control means for substantially varying the actuation of said engine means at engine speeds below said predetermined engine speed and for maintaining normal actuation of said ignition means above said predetermined speed, said ignition timing control means including means for terminating firing of said first plug after said engine reaches said predetermined speed and for maintaining firing of said second plug throughout the operation of said engine; and g. means responsive to the idling operation of said engine for maintaining said ignition timing at the engine''s normal state regardless of the operation of said ignition timing control means.
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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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |