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Patent US4590907A successfully refreshed from Google Patents.
US4590907A
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US
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Method of adaptively controlling individual cylinder fuel injection quantities in electronically controlled diesel engine and device therefor
Assignee: Toyota Motor Corp
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Filing: 1985-02-22
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Granted: 1986-05-27
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Expires: 2005-02-22
Abstract
Abstract In effecting individual cylinder fuel injection control in an electronically controlled diesel engine, wherein rpm variations with every explosion cylinder are detected and compared with one another, the increase or decrease in the fuel injection quantity with every cylinder is learned until rpm variations of the respective cylinders become uniform, and a fuel injection quantity control actuator is controlled with every cylinder, so that engine vibrations due to a dispersion in fuel injection quantity between the cylinders can be controlled, an adaptive correction quantity is determined in accordance with an rpm variation deviation obtained from a difference between a mean rpm variation and rpm variations of the respective cylinders, and the engine temperature or the fuel temperature, and the fuel injection quantity control actuator is controlled with every cylinder in accordance with the adaptive correction quantity, to thereby prevent the divergence of the correction quantity.
Inventors
- 👤 Keisuke Tsukamoto
- 👤 Masaomi Nagase
- 👤 Kiyotaka Matsuno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:31
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/008; F02D41/0085; F02D41/30; F02D41/38; F02D41/40; F02D41/406; F02D41/408; F02B; F02B1/00; F02B1/02; F02B1/04; F02B3/00; F02B3/06; F02D2200/00; F02D2200/02; F02D2200/04; F02D2200/0406; F02D2200/06; F02D2200/0606; F02D41/02; F02D41/14; F02D41/1497; F02D41/1498; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/40
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
174 words
A method of adaptively controlling individual cylinder fuel injection quantities in an electronically controlled diesel engine, wherein rpm variations of every explosion cylinder are detected from engine speeds and compared with a mean value of the rpm variations of all the cylinders, a correction quantity to be increased or decreased is learned in accordance with an rpm variation deviation or every cylinder until the rpm variations of the cylinders become uniform, and a spill actuator is adjusted for every cylinder, so that engine vibrations due to a dispersion in fuel injection quantity between the cylinders can be reduced, characterized in that said method comprises the steps of: detecting engine temperature or fuel temperature; determining an rpm variation deviation from a difference between a mean rpm variation of all the cylinders and the rpm variations of the respective cylinders; determining an everytime correction quantity in accordance with said rpm variation deviation and said engine temperature or said fuel temperature; and determining an individual cylinder correction quantity by integrating said everytime correction quantities of every cylinder.
Claim 2
Independent Claim
174 words
A method of adaptively controlling individual cylinder fuel injection quantities in an electronically controlled diesel engine, wherein rpm variations of every explosion cylinder are detected from engine speeds and compared with a mean value of the rpm variations of all the cylinders, a correction quantity to be increased or decreased is learned in accordance with an rpm variation deviation or every cylinder until the rpm variations of the cylinders become uniform, and a spill actuator is adjusted for every cylinder, so that engine vibrations due to a dispersion in fuel injection quantity between the cylinders can be reduced, characterized in that said method comprises the steps of: detecting engine temperature or fuel temperature; determining an rpm variation deviation from a difference between a mean rpm variation of all the cylinders and the rpm variations of the respective cylinders; determining an everytime correction quantity in accordance with said rpm variation deviation and said engine temperature or said fuel temperature; and determining an individual cylinder correction quantity by integrating said everytime correction quantities of every cylinder.
Claim 3
Dependent Claim
21 words
A method of adaptively controlling as set forth in claim 1, wherein said engine temperature is regarded as a coolant temperature.
Claim 4
Dependent Claim
26 words
A method of adaptively controlling as set forth in claim 1, wherein said fuel temperature is regarded as a fuel temperature in a fuel injection pump.
Claim 5
Dependent Claim
42 words
A method of adaptively controlling as set forth in claim 1, wherein said everytime correction quantity is reduced to a small value as said rpm variation deviation becomes smaller, when said engine temperature or said fuel temperature is lower than normal temperature.
Claim 6
Dependent Claim
53 words
A method of adaptively controlling as set forth in claim 1, wherein said everytime correction quantity is reduced to a small value as said rpm variation deviation becomes smaller, and a non-sensitive zone to said rpm variation deviation is expanded, when said engine temperature or said fuel temperature is lower than normal temperature.
Claim 7
Independent Claim
199 words
A device for adaptively controlling individual cylinder fuel injection quantities in an electronically controlled diesel engine, wherein said device comprises: a fuel injection pump including a spill ring and a spill actuator, for controlling fuel injection quantities; injection nozzles for injecting fuel discharged from a fuel injection pump into combustion chambers; an accelerator sensor for detecting an accelerator opening; an engine rotation sensor for detecting an engine speed; a temperature sensor for detecting engine temperature or fuel temperature; and a control unit for determining a target injection quantity at least from said accelerator opening and said engine speed, controlling said spill actuator so that fuel of target injection quantity can be discharged from said fuel injection pump, determining an everytime correction quantity in accordance with an rpm variation deviation, obtained from a difference between a mean rpm variation of all the cylinders and the rpm variations of the respective cylinders, and said engine temperature or said fuel temperature so as to eliminate a dispersion in the rpm variation, determining an individual cylinder correction quantity by interating said everytime correction quantities of every cylinder, and controlling said spill actuator for every cylinder in accordance with said individual cylinder correction quantity.
Claim 8
Independent Claim
199 words
A device for adaptively controlling individual cylinder fuel injection quantities in an electronically controlled diesel engine, wherein said device comprises: a fuel injection pump including a spill ring and a spill actuator, for controlling fuel injection quantities; injection nozzles for injecting fuel discharged from a fuel injection pump into combustion chambers; an accelerator sensor for detecting an accelerator opening; an engine rotation sensor for detecting an engine speed; a temperature sensor for detecting engine temperature or fuel temperature; and a control unit for determining a target injection quantity at least from said accelerator opening and said engine speed, controlling said spill actuator so that fuel of target injection quantity can be discharged from said fuel injection pump, determining an everytime correction quantity in accordance with an rpm variation deviation, obtained from a difference between a mean rpm variation of all the cylinders and the rpm variations of the respective cylinders, and said engine temperature or said fuel temperature so as to eliminate a dispersion in the rpm variation, determining an individual cylinder correction quantity by interating said everytime correction quantities of every cylinder, and controlling said spill actuator for every cylinder in accordance with said individual cylinder correction quantity.
Claim 9
Independent Claim
188 words
A method of adaptively controlling individual cylinder fuel injection quantities in an electronically controlled diesel engine, wherein rpm variations of every explosion cylinder are detected from engine speeds and compared with a mean value of the rpm variations of all the cylinders, a correction quantity to be increased or decreased is learned in accordance with an rpm variation deviation of every cylinder until the rpm variations of the cylinders become uniform, and a spill actuator is controlled with every cylinder, so that engine vibrations due to a dispersion in fuel injection quantity between the cylinders can be reduced, characterized in that said method comprises the steps of: detecting engine temperature or fuel temperature; determining the rpm variation deviation from a difference between a mean rpm variation and the rpm variations of the respective cylinders; determining an rpm variation deviation for the control in accordance with said rpm variation deviation and said engine temperature or said fuel temperature; determining an everytime correction quantity in accordance with said rpm variation deviation for the control; and determining an individual cylinder correction quantity by integrating said everytime correction quantities of every cylinder.
Claim 10
Independent Claim
188 words
A method of adaptively controlling individual cylinder fuel injection quantities in an electronically controlled diesel engine, wherein rpm variations of every explosion cylinder are detected from engine speeds and compared with a mean value of the rpm variations of all the cylinders, a correction quantity to be increased or decreased is learned in accordance with an rpm variation deviation of every cylinder until the rpm variations of the cylinders become uniform, and a spill actuator is controlled with every cylinder, so that engine vibrations due to a dispersion in fuel injection quantity between the cylinders can be reduced, characterized in that said method comprises the steps of: detecting engine temperature or fuel temperature; determining the rpm variation deviation from a difference between a mean rpm variation and the rpm variations of the respective cylinders; determining an rpm variation deviation for the control in accordance with said rpm variation deviation and said engine temperature or said fuel temperature; determining an everytime correction quantity in accordance with said rpm variation deviation for the control; and determining an individual cylinder correction quantity by integrating said everytime correction quantities of every cylinder.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-05-26 | 1989-11-25 | 1990-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-05-26 | 1993-11-25 | 1994-05-27 | $3760.00 | Window Closed / Lapsed |
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