Patent US4561389A successfully refreshed from Google Patents.
US4561389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Engine operation control means for suppressing rough engine operations
Assignee: Mazda Motor Corp
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Filing: 1985-02-04
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Granted: 1985-12-31
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Expires: 2005-02-04
Abstract
Abstract An engine operation control system comprising a vibration detector for detecting engine vibrations and producing an engine vibration signal, an engine speed detector for detecting engine speed and producing an engine speed signal, an engine combustion control device for controlling at least one factor which governs engine combustion, an engine roughness control device adapted for receiving the engine vibration signal to distinguish engine roughness and effect control for a time period on the engine combustion control device so that the engine roughness is suppressed, a control time changing device adapted for receiving the engine speed signal and determining the time period wherein the engine combustion control device is controlled in accordance with the engine speed so that the time period is decreased as the engine speed increases.
Inventors
- 👤 Tokuichi Matsumoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:52
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1497
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
148 words
An engine operation control system comprising: (a) vibration detecting means for detecting low frequency engine vibrations representative of engine roughness, and for providing an engine roughness signal; (b) engine intake mixture control means responsive to said engine roughness signal for controlling at least one intake mixture parameter affecting engine combustion in a manner to avoid misfiring and for providing a control output signal for a predetermined time period; (c) actuator means responsive to said control output signal for continuously controlling said intake mixture parameter in a direction which avoids engine roughness due to misfiring; (d) engine speed sensing means to provide an engine speed signal; (e) said intake mixture control means detecting when said engine speed reaches a predetermined value and subsequently adjusting said actuator means at a more rapid rate when said predetermined value is exceeded in order to minimize overcontrol by said intake mixture control means.
Claim 2
Dependent Claim
148 words
An engine operation control system comprising: (a) vibration detecting means for detecting low frequency engine vibrations representative of engine roughness, and for providing an engine roughness signal; (b) engine intake mixture control means responsive to said engine roughness signal for controlling at least one intake mixture parameter affecting engine combustion in a manner to avoid misfiring and for providing a control output signal for a predetermined time period; (c) actuator means responsive to said control output signal for continuously controlling said intake mixture parameter in a direction which avoids engine roughness due to misfiring; (d) engine speed sensing means to provide an engine speed signal; (e) said intake mixture control means detecting when said engine speed reaches a predetermined value and subsequently adjusting said actuator means at a more rapid rate when said predetermined value is exceeded in order to minimize overcontrol by said intake mixture control means.
Claim 3
Dependent Claim
47 words
An engine operation control system in accordance with claim 1 wherein said vibration detecting means includes a vibration sensor to sense engine vibrations and to provide a vibration signal, and low-pass filter means for selectively passing vibration signals below a predetermined frequency and representative of engine roughness.
Claim 4
Dependent Claim
33 words
An engine operation control system in accordance with claim 1 wherein said intake mixture control means includes air-fuel ratio control means operable to enrich the engine air-fuel mixture when engine roughness is detected.
Claim 5
Dependent Claim
42 words
An engine operation control system in accordance with claim 1 wherein said intake mixture control means includes exhaust gas recirculation control means operable to admit exhaust gas into the engine intake and to decrease recirculated exhaust gas when engine roughness is detected.
Claim 6
Dependent Claim
74 words
An engine operation control system in accordance with claim 1 wherein the engine intake mixture control means includes air bleed means for selectively introducing bleed air into the engine intake mixture to control air-fuel ratio, said air bleed means including air bleed valve means and actuator means responsive to the control output signal from said mixture control means to position said air bleed valve means to reduce bleed air flow to minimize engine roughness.
Claim 7
Dependent Claim
44 words
An engine operation control system in accordance with claim 1 which further includes means for continuously controlling said engine intake mixture control means to control one intake mixture parameter continuously to a value below a value at which engine roughness is likely to occur.
Claim 8
Dependent Claim
49 words
An engine operation control system in accordance with claim 3 wherein the engine intake mixture control means includes fuel injection means for controlling the air-fuel ratio of the engine intake mixture, said fuel injection means including fuel injection nozzle means and air flow meter means for controlling air-fuel ratio.
Claim 9
Dependent Claim
108 words
An engine operation control system in accordance with claim 3 wherein said air-fuel ratio control means includes an air and fuel intake passage including means for providing a desired air-fuel mixture to an engine; an air-bleed passage means in said intake passage for admitting additional air to said air-fuel mixture; actuator means connected to said air-bleed passage means for controlling the amount of bleed air admitted to said intake passage; said control signal applied to said actuator means to control the air-fuel mixture by reducing the quantity of bleed air to enrich the intake mixture by a predetermined rate in each engine operating cycle to suppress engine roughness.
Claim 10
Dependent Claim
22 words
An engine operation control system in accordance with claim 8 wherein said means for providing a desired air-fuel mixture is a carburetor.
Claim 11
Dependent Claim
77 words
An engine operation control system in accordance with claim 4 wherein the engine intake mixture control means includes exhaust gas recirculation means for selectively controlling the volume of exhaust gas recirculated to the engine intake system, said exhaust gas recirculation means including an exhaust gas recirculation valve and actuator means responsive to the control output signal from said mixture control means to position said exhaust gas recirculation valve to reduce exhaust gas recirculation and minimize engine roughness.
Claim 12
Dependent Claim
36 words
An engine operation control system in accordance with claim 4 which further includes means for continuously controlling the exhaust gas recirculating means to control the amount of the exhaust gas recirculated to the engine intake system.
Claim 13
Dependent Claim
101 words
An engine operation control system in accordance with claim 4 wherein said control system includes an air flowmeter in said intake system to provide an air flow output signal to said intake mixture control means; an air and fuel intake passage including means for providing a desired air-fuel mixture to an engine; and said exhaust gas recirculating means includes actuator means to control the operation of an exhaust gas recirculation control valve; said control signal applied to said actuator means to control the quantity of exhaust gas recirculated by a predetermined rate in each engine operating cycle to suppress engine roughness.
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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) | 1988-12-30 | 1989-07-01 | 1989-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-12-30 | 1993-07-01 | 1993-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-12-30 | 1997-07-01 | 1997-12-31 | $7700.00 | Window Closed / Lapsed |