Patent US4633844A successfully refreshed from Google Patents.
US4633844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ignition timing control for a supercharged engine
Assignee: Mazda Motor Corp
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Filing: 1985-05-28
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Granted: 1987-01-06
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Expires: 2005-05-28
Abstract
Abstract A supercharged engine having a supercharger which is operated only when the engine load is greater than a predetermined value. An ignition timing control device is provided for determining a basic ignition timing in accordance with the engine operating condition. The basic ignition timing is retarded by a predetermined value when a supercharging signal is produced for commencing the supercharging, and is gradually advanced to the basic ignition timing in a predetermined time period.
Inventors
- 👤 Haruo Okimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 03:23
CPC Classifications
F; F02; F02B; F02B33/00; F02B33/44; F02B33/446; F02B39/00; F02B39/02; F02B39/12; F02P; F02P5/00; F02P5/04; F02P5/145; F02P5/15; F02P5/1502; F02P5/1516; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
97 words
A supercharged engine including combustion chamber means, supercharging means for producing a supercharging pressure, means for introducing the supercharging pressure into said combustion chamber means under an engine load greater than a predetermined value, supercharging start signal generating means for generating a supercharging start signal when the engine load increases beyond the predetermined value, and ignition timing control means responsive to said supercharging start signal to retard ignition timing, wherein said ignition timing control means includes means for retarding the ignition timing for a predetermined time period from an instant when the supercharging start signal is produced.
Claim 2
Dependent Claim
97 words
A supercharged engine including combustion chamber means, supercharging means for producing a supercharging pressure, means for introducing the supercharging pressure into said combustion chamber means under an engine load greater than a predetermined value, supercharging start signal generating means for generating a supercharging start signal when the engine load increases beyond the predetermined value, and ignition timing control means responsive to said supercharging start signal to retard ignition timing, wherein said ignition timing control means includes means for retarding the ignition timing for a predetermined time period from an instant when the supercharging start signal is produced.
Claim 3
Dependent Claim
109 words
A supercharged engine including combustion chamber means, supercharging means for producing a supercharging pressure, means for introducing the supercharging pressure into said combustion chamber means under an engine load greater than a predetermined value, supercharging start signal generating means for generating a supercharging start signal when the engine load increases beyond the predetermined value, and ignition timing control means responsive to said supercharging start signal to retard ignition timing, wherein said ignition timing control means includes means for retarding the ignition timing by a predetermined value and gradually advancing in a predetermined time period the ignition timing to a value determined for an actual engine operating condition under supercharging.
Claim 4
Dependent Claim
109 words
A supercharged engine including combustion chamber means, supercharging means for producing a supercharging pressure, means for introducing the supercharging pressure into said combustion chamber means under an engine load greater than a predetermined value, supercharging start signal generating means for generating a supercharging start signal when the engine load increases beyond the predetermined value, and ignition timing control means responsive to said supercharging start signal to retard ignition timing, wherein said ignition timing control means includes means for retarding the ignition timing by a predetermined value and gradually advancing in a predetermined time period the ignition timing to a value determined for an actual engine operating condition under supercharging.
Claim 5
Dependent Claim
34 words
A supercharged engine in accordance with claim 1 which includes drive means for connecting said supercharging means to an engine output shaft so that said supercharging means is driven by the engine output shaft.
Claim 6
Dependent Claim
28 words
A supercharged engine in accordance with claim 3 in which said drive means includes clutch means which is engaged under an engine load greater than said predetermined value.
Claim 7
Dependent Claim
26 words
A supercharged engine in accordance with claim 3 in which said drive means includes clutch means which is engaged when the supercharging start signal is received.
Claim 8
Dependent Claim
171 words
A supercharged engine including combustion chamber means, first intake passage means leading to said combustion chamber means for providing a supply of intake air, second intake passage means leading to said combustion chamber means, said second intake passage means introducing the supercharging air into the combustion chamber means in addition to said intake air from the first passage means at least in the compression stroke, supercharging means provided in said second intake passage means for providing a supply of supercharging air, supercharging control means for producing a supercharging signal under an engine load greater than a predetermined value so that the supercharging air is introduced under the engine load greater than the predetermined value, ignition timing control means for controlling ignition timing in accordance with engine operating conditions, said ignition timing control means including modifying means responsive to said supercharging signal for retarding said ignition timing, wherein said modifying means is means for retarding the ignition timing for a predetermined time period from an instant when the supercharging signal is produced.
Claim 9
Dependent Claim
171 words
A supercharged engine including combustion chamber means, first intake passage means leading to said combustion chamber means for providing a supply of intake air, second intake passage means leading to said combustion chamber means, said second intake passage means introducing the supercharging air into the combustion chamber means in addition to said intake air from the first passage means at least in the compression stroke, supercharging means provided in said second intake passage means for providing a supply of supercharging air, supercharging control means for producing a supercharging signal under an engine load greater than a predetermined value so that the supercharging air is introduced under the engine load greater than the predetermined value, ignition timing control means for controlling ignition timing in accordance with engine operating conditions, said ignition timing control means including modifying means responsive to said supercharging signal for retarding said ignition timing, wherein said modifying means is means for retarding the ignition timing for a predetermined time period from an instant when the supercharging signal is produced.
Claim 10
Dependent Claim
40 words
A supercharged engine in accordance with claim 6 which includes valve means provided in said second intake passage means downstream of the supercharging means and, means for opening said valve means under an engine load greater than the predetermined value.
Claim 11
Dependent Claim
190 words
A supercharged engine including combustion chamber means, first intake passage means leading to said combustion chamber means for providing a supply of intake air, second intake passage means leading to said combustion chamber means, said second intake passage means introducing the supercharging air into the combustion chamber means in addition to said intake air from the first passage means at least in the compression stroke, supercharging means provided in said second intake passage means for providing a supply of supercharging air, supercharging control means for producing a supercharging signal under an engine load greater than a predetermined value so that the supercharging air is introduced under the engine load greater than the predetermined value, ignition timing control means for controlling ignition timing in accordance with engine operating conditions, said ignition timing control means including modifying means responsive to said supercharging signal for retarding said ignition timing, wherein said modifying means is means for retarding the ignition timing by a predetermined value when the supercharging signal is produced and gradually advancing in a predetermined time period the ignition timing to a value determined for an actual engine operating condition under supercharging.
Claim 12
Dependent Claim
190 words
A supercharged engine including combustion chamber means, first intake passage means leading to said combustion chamber means for providing a supply of intake air, second intake passage means leading to said combustion chamber means, said second intake passage means introducing the supercharging air into the combustion chamber means in addition to said intake air from the first passage means at least in the compression stroke, supercharging means provided in said second intake passage means for providing a supply of supercharging air, supercharging control means for producing a supercharging signal under an engine load greater than a predetermined value so that the supercharging air is introduced under the engine load greater than the predetermined value, ignition timing control means for controlling ignition timing in accordance with engine operating conditions, said ignition timing control means including modifying means responsive to said supercharging signal for retarding said ignition timing, wherein said modifying means is means for retarding the ignition timing by a predetermined value when the supercharging signal is produced and gradually advancing in a predetermined time period the ignition timing to a value determined for an actual engine operating condition under supercharging.
Claim 13
Dependent Claim
43 words
A supercharged engine in accordance with claim 7 which includes throttle valve means provided in said first intake passage means, and said supercharging control means is means for producing the supercharging signal when said throttle valve means is opened beyond a predetermined value.
Claim 14
Dependent Claim
42 words
A supercharged engine in accordance with claim 9 in which said valve means in said second intake passage means is interconnected with said throttle valve means so as to be opened when said throttle valve means is opened beyond said predetermined value.
Claim 15
Dependent Claim
34 words
A supercharged engine in accordance with claim 6 which includes drive menas for connecting said supercharging means to an engine output shaft so that said supercharging means is driven by the engine output shaft.
Claim 16
Dependent Claim
25 words
A supercharged engine in accordance with claim 11 in which said drive means includes clutch means which is engaged when the supercharging signal is produced.
Claim 17
Dependent Claim
28 words
A supercharged engine in accordance with claim 11 in which said drive means includes clutch means which is engaged under an engine load greater than said predetermined value.
Claim 18
Dependent Claim
68 words
A supercharged engine in accordance with claim 7 in which said modifying means is means for retarding the ignition timing by a predetermined value when the supercharging signal is produced and gradually advancing in a predetermined time period the ignition timing to a value determined for an actual engine operating condition under supercharging said drive means including clutch means which is engaged when the supercharging signal is produced.
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) | 1990-01-05 | 1990-07-07 | 1991-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-05 | 1994-07-07 | 1995-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-05 | 1998-07-07 | 1999-01-06 | $7700.00 | Window Closed / Lapsed |