US4075989A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for operating 2-cycle internal combustion engine
Assignee: Denso Corp
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Filing: 1976-06-16
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Granted: 1978-02-28
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Expires: 1996-06-16
Abstract
Abstract An ignition timing for a 2-cycle internal combustion engine is sharply and continuously retarded as the engine speed increases above a set engine speed at which the engine can produce a maximum output power, whereby the engine output power is gradually decreased above the set engine speed.
Inventors
- 👤 Masao Nagasawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:07
CPC Classifications
F; F02; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/155; F02P5/1553; F02P5/1556; F02P5/1555; F02B; F02B75/00; F02B75/02; F02B2075/022; F02B2075/025; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
106 words
A method for operating a 2-cycle internal combustion engine having a combustion chamber comprising the steps of; introducing an air-fuel mixture into said combustion chamber; compressing the air-fuel mixture during the compression stroke of said engine; igniting the compressed air-fuel mixture before said compression stroke ends, to thereby produce a power therein, the ignition timing for each igniting step being gradually advanced as the engine speed increases up to a set engine speed at which the engine can produce a maximum output power, the ignition timing being sharply and continuously retarded as the engine speed increases above said set engine speed; and discharging the burnt gases.
Claim 2
Independent Claim
106 words
A method for operating a 2-cycle internal combustion engine having a combustion chamber comprising the steps of; introducing an air-fuel mixture into said combustion chamber; compressing the air-fuel mixture during the compression stroke of said engine; igniting the compressed air-fuel mixture before said compression stroke ends, to thereby produce a power therein, the ignition timing for each igniting step being gradually advanced as the engine speed increases up to a set engine speed at which the engine can produce a maximum output power, the ignition timing being sharply and continuously retarded as the engine speed increases above said set engine speed; and discharging the burnt gases.
Claim 3
Independent Claim
127 words
A method for operating a 2-cycle internal combustion engine having a combustion chamber comprising the steps of; introducing an air-fuel mixture into said combustion chamber; compressing the air-fuel mixture during the compression stroke of said engine; igniting the compressed air-fuel mixture before said compression stroke comes to an end, at ignition timings gradually advancing for each igniting step as the engine speed increases up to a set engine speed at which the engine can produce a maximum output power, to thereby produce a power therein; and discharging burnt gases from said combustion chamber, wherein an improved method comprises the step of igniting the compressed air-fuel mixture for each igniting step at ignition timings sharply and continuously retarding as the engine speed increases above said set engine speed.
Claim 4
Independent Claim
127 words
A method for operating a 2-cycle internal combustion engine having a combustion chamber comprising the steps of; introducing an air-fuel mixture into said combustion chamber; compressing the air-fuel mixture during the compression stroke of said engine; igniting the compressed air-fuel mixture before said compression stroke comes to an end, at ignition timings gradually advancing for each igniting step as the engine speed increases up to a set engine speed at which the engine can produce a maximum output power, to thereby produce a power therein; and discharging burnt gases from said combustion chamber, wherein an improved method comprises the step of igniting the compressed air-fuel mixture for each igniting step at ignition timings sharply and continuously retarding as the engine speed increases above said set engine speed.
Claim 5
Dependent Claim
34 words
A method for operating a 2-cycle internal combustion engine as set forth in claim 2, wherein the ignition timing is retarded at a rate of a degree from 10 to 20 per 1,000 rpm.
Claim 6
Independent Claim
64 words
A method for operating a 2-cycle internal combustion engine which comprises the steps of igniting compressed air-fuel mixture at an ignition timing and advancing said ignition timing for normal engine operation, wherein the improvement comprises the step of: sharply and continuously retarding said ignition timing as the engine speed increases above a set engine speed at which said engine produces a maximum output power.
Claim 7
Independent Claim
64 words
A method for operating a 2-cycle internal combustion engine which comprises the steps of igniting compressed air-fuel mixture at an ignition timing and advancing said ignition timing for normal engine operation, wherein the improvement comprises the step of: sharply and continuously retarding said ignition timing as the engine speed increases above a set engine speed at which said engine produces a maximum output power.
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) | 1981-02-27 | 1981-08-29 | 1982-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-02-27 | 1985-08-29 | 1986-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-02-27 | 1989-08-29 | 1990-02-28 | $7700.00 | Window Closed / Lapsed |