US3734069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
System for purifying the exhaust gas of a two-cycle gasoline injection engine
Assignee: Subaru Corp
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Filing: 1970-11-16
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Granted: 1973-05-22
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Expires: 1990-11-16
Abstract
Abstract A system for purifying an exhaust gas of two-cycle gasoline injection engine has an automatic injection nozzle disposed relative to a cylinder displaced from the central axis of the cylinder toward the exhaust port to eject the gasoline in the direction intermediate the center of the piston crown when disposed at the bottom dead center point and the cylinder wall opposite the exhaust port and also against the scavenging gas stream flowing from the scavenging port to the cylinder head. The spray angle is selected in the range of 15* to 60*. The end of stationary injection timing is selected in the range from the bottom dead center to 30* after the bottom dead center, and its injection duration held to less than 1.5 millisecond. An injection pump completely shuts off the fuel during high speed no load operations, and the throttle valve, accelerator pedal and ignition timing means are interlocked so that the throttle valve may not close less than a predetermined opening upon light load operation to maintain the idle speed of the engine. Its ignition timing is changed in response to the opening of the accelerator less than the predetermined opening in order to reduce the concentration of exhaust hydrocarbon and carbon monoxide.
Inventors
- 👤 Y Akiyama
- 👤 T Sato
- 👤 S Koyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:58
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/02; F02B; F02B25/00; F02B1/00; F02B1/02; F02B1/04; F02B2720/00; F02B2720/13; F02B2720/137
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
379 words
A system for purifying exhaust gases of a two-cycle gasoline spark-ignition engine having fuel injection comprising: an automatic injection nozzle positioned in a cylinder head of said engine for injecting fuel into the interior of a cylinder, said automatic injection nozzle being disposed in a position displaced from the central longitudinal axis of the cylinder in a direction toward the exhaust port side of said engine, said injection nozZle injecting fuel in a direction intermediate the center of the piston crown of said engine when the piston is disposed at bottom dead center and the cylinder wall of said engine opposite the exhaust port, said injection nozzle being further disposed in the direction opposite the scavenging gas stream flowing into the cylinder from the scavenging port of said engine to the cylinder head, the spraying angle of said injection nozzle being selected in the range from 15* to 60*, the end of stationary injection timing of said injection nozzle being selected in the range from bottom dead center to 30* after the bottom dead center position of the piston, the duration of the injection selected to be less than 1.5 milleseconds; an injection pump operatively connected to said injection nozzle for supplying fuel to said injection nozzle, said injection pump adapted to completely shut off the supply of fuel to said injection nozzle upon a high speed - no load operation of said engine; a throttle valve for controlling the supply of air to said engine; an ignition timing means for advancing and retarding the timing of the ignition of the spark plug of said two-cycle gasoline engine; an accelerator pedal means for controlling said throttle valve, said fuel injection pump and said ignition timing means; and linkage means operatively connecting said accelerator pedal with said throttle valve, said fuel injection pump and said ignition timing means, said linkage means including stop means to prevent the closing of said throttle valve less than a predetermined opening to maintain an idle speed of the engine upon light load engine operation, said linkage means interconnecting said accelerator pedal and said ignition timing means to permit selective retardation of the ignition timing during light load operations during movement of said accelerator pedal less than said predetermined opening position of said throttle valve.
Claim 2
Independent Claim
379 words
A system for purifying exhaust gases of a two-cycle gasoline spark-ignition engine having fuel injection comprising: an automatic injection nozzle positioned in a cylinder head of said engine for injecting fuel into the interior of a cylinder, said automatic injection nozzle being disposed in a position displaced from the central longitudinal axis of the cylinder in a direction toward the exhaust port side of said engine, said injection nozZle injecting fuel in a direction intermediate the center of the piston crown of said engine when the piston is disposed at bottom dead center and the cylinder wall of said engine opposite the exhaust port, said injection nozzle being further disposed in the direction opposite the scavenging gas stream flowing into the cylinder from the scavenging port of said engine to the cylinder head, the spraying angle of said injection nozzle being selected in the range from 15* to 60*, the end of stationary injection timing of said injection nozzle being selected in the range from bottom dead center to 30* after the bottom dead center position of the piston, the duration of the injection selected to be less than 1.5 milleseconds; an injection pump operatively connected to said injection nozzle for supplying fuel to said injection nozzle, said injection pump adapted to completely shut off the supply of fuel to said injection nozzle upon a high speed - no load operation of said engine; a throttle valve for controlling the supply of air to said engine; an ignition timing means for advancing and retarding the timing of the ignition of the spark plug of said two-cycle gasoline engine; an accelerator pedal means for controlling said throttle valve, said fuel injection pump and said ignition timing means; and linkage means operatively connecting said accelerator pedal with said throttle valve, said fuel injection pump and said ignition timing means, said linkage means including stop means to prevent the closing of said throttle valve less than a predetermined opening to maintain an idle speed of the engine upon light load engine operation, said linkage means interconnecting said accelerator pedal and said ignition timing means to permit selective retardation of the ignition timing during light load operations during movement of said accelerator pedal less than said predetermined opening position of said throttle valve.
Claim 3
Dependent Claim
149 words
The system as set forth in claim 1, wherein said linkage means comprises: a butterfly throttle valve provided in an air intake passage and integrally coupled to a shaft supported by said engine, first and second levers rotating integrally with said shaft, a third lever freely rotatable about a bearing portion supported by said engine, a first return spring engaged with said second lever for urging said second lever, a stopper for stopping said second lever so that it may not close to less than a predetermined limit, a fourth lever interconnected to said linkage consisting of said first, second and third levers, a second return spring engaged with said fourth lever for urging said fourth lever, a cam groove within said fourth lever, a fifth lever operatively received by said cam groove, a sixth lever interconnecting said fifth lever and said ignition contact breaker to rotate the same.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |