Closed-loop mixture controlled fuel injection system
원문보기
IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
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출원번호 |
US-0574458
(1984-01-27)
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우선권정보 |
JP-0013518 (1983-01-28) |
발명자
/ 주소 |
- Takao, Mitsunori
- Kimura, Takahiko
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출원인 / 주소 |
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대리인 / 주소 |
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인용정보 |
피인용 횟수 :
7 인용 특허 :
10 |
초록
▼
A closed-loop mixture control system for an internal combustion engine comprises an intake air pressure sensor, an engine speed sensor, an exhaust gas sensor for detecting the concentration of a predetermined composition of exhaust emissions from said engine, said concentration varying as a function
A closed-loop mixture control system for an internal combustion engine comprises an intake air pressure sensor, an engine speed sensor, an exhaust gas sensor for detecting the concentration of a predetermined composition of exhaust emissions from said engine, said concentration varying as a function of the air-fuel ratio of a mixture supplied to the engine, a memory having a plurality of storage locations, and a data processor. The processor derives a basic quantity of fuel to be injected to the engine as a function of the detected pressure and engine speed, a mixture trimming value as a function of the detected concentration, a fuel injection trimming value dependent on the mixture trimming value, and stores the fuel injection trimming value into a memory location exclusively addressable as a function of the detected engine speed. The stored fuel injection trimming value is read as a function of the detected engine speed from the memory and summed with the basic quantity in response to which the fuel quantity to be injected to the engine is controlled.
대표청구항
▼
1. A mixture control system for an internal combustion engine, comprising: first means for detecting the pressure of air inducted to said engine; second means for detecting the speed of said engine; third means for detecting the concentration of a predetermined composition of exhaust emissions
1. A mixture control system for an internal combustion engine, comprising: first means for detecting the pressure of air inducted to said engine; second means for detecting the speed of said engine; third means for detecting the concentration of a predetermined composition of exhaust emissions from said engine, said concentration varying as a function of the air-fuel ratio of a mixture supplied to said engine; a memory having a plurality of storage locations; control means effective to determine the optimum value of the air-fuel ratio of a mixture to be inducted to said engine, said control means including means for: (a) deriving a basic quantity of fuel to be injected to said engine as a function of the detected pressure and engine speed, (b) deriving a first trimming value as a function of the detected concentration, (c) determining a second trimming value as a function of one of a plurality of ranges of different engine speed values to which the detected engine speed belongs, (d) correcting said second trimming value dependant on said first trimming value, (e) storing the corrected second trimming value into a storage location of said memory exclusively addressable as a function of the detected engine speed, (f) reading the stored second trimming value as a function of the detected engine speed from said memory, and (g) trimming said basic quantity by adding thereto the read second trimming value; and means for injecting fuel to said engine in response to the trimmed quantity. 2. A system as claimed in claim 1, wherein said memory is of a nonvolatile type. 3. A system as claimed in claim 1, wherein said storage locations of said memory are addressable as a function of an engine speed value, said memory storing second trimming values one of which corresponds to one of a plurality of ranges of different engine speed values, and wherein said control means is arranged to successively detect to which one of said ranges the detected engine speed belongs in order to successively determine one of the stored second trimming values corresponding to the detected engine speed value, said stored second trimming values being corrected in dependance on said first trimming value, said first trimming value being corrected in accordance with the output state of said third means. 4. A system as claimed in claim 3, wherein control means is arranged to accumulate said first trimming value, derive an average value of the accumulated first trimming values and trim said stored second trimming value by a predetermined amount in a direction depending on said average value. 5. A mixture control system for an internal combustion engine, comprising: first means for detecting the pressure of air inducted to said engine; second means for detecting the speed of said engine; third means for detecting the concentration of a predetermined constituent of exhaust gases from said engine, said concentration varying as a function of the air-fuel ratio of a mixture supplied to said engine; a memory having a plurality of storage locations; data processing means programmed to perform the step of: (a) deriving a basic quantity of fuel to be injected to said engine as a function of the detected pressure and engine speed; (b) deriving a first trimming value as a function of the detected concentration; (c) repeating the step (b) a number of predetermined times to derive an average value of the derived first trimming values; (d) determining a second trimming value as a function of one of a plurality of ranges of different engine speed values to which the detected engine speed belongs; (e) correcting said second trimming value according to said average value; storing the corrected second trimming value into a storage location of said memory exclusively addressable as a function of the detected engine speed; (g) reading the stored second trimming value as a function of the detected engine speed from said memory; (h) trimming said basic quantity by adding thereto the read second trimming value; and (i) further trimming the trimmed basic quantity by multiplying said average value of derived first trimming values thereby; and means for injecting fuel to said engine in response to the basic quantity trimmed in the step (i). 6. A system as claimed in claim 5, wherein said memory is of a nonvolatile type. 7. A system as claimed in claim 5, wherein said storage locations of said memory are addressable as a function of an engine speed value, said memory storing second trimming values one of which corresponds to one of a plurality of ranges of different engine speed values, and wherein said data processing means is further programmed to perform the steps of: (A) successively detecting to which one of said ranges the detected engine speed belongs; (B) detecting a match between the successively detected ranges; and (C) correcting the stored second trimming value in dependance on said first trimming value in response to said match being detected. 8. A system as claimed in claim 7, wherein data processing means is further programmed to perform the steps of: accumulating said first trimming value; deriving an average value of the accumulated first trimming values; and wherein in the step (C) the stored second trimming value is trimmed by a predetermined amount in a direction depending on said average value of the first trimming values.
이 특허에 인용된 특허 (10)
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Kobayashi Akio (Kariya JPX) Kikuchi Takehiro (Kariya JPX) Kondo Toshio (Anjo JPX) Tajima Masahiko (Takahama JPX), Air-fuel ratio control apparatus.
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Kondo Toshio (Anjo JPX) Sagisaka Yasuo (Kariya JPX) Tajima Masahiko (Takahama JPX) Kobayashi Akio (Kariya JPX), Air-fuel ratio control method and its apparatus.
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Sagisaka Yasuo (Kariya JPX) Kondo Toshio (Anjo JPX) Tajima Masahiko (Takahama JPX), Air-fuel ratio controlling method and apparatus therefor.
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Bowler ; Lauren L. ; Lahiff ; John E., Fuel control system with calibration learning capability for motor vehicle internal combustion engine.
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Rice John O. (Utica MI), Fuel control with learning capability for motor vehicle combustion engine.
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Kondo Toshio (Anjo JPX) Kobayashi Akio (Kariya JPX) Eino Tomomi (Kariya JPX) Tajima Masahiko (Takahama JPX), Method and apparatus for controlling air/fuel ratio in internal combustion engines.
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Tajima Masahiko (Takahama JPX) Sagisaka Yasuo (Kariya JPX) Kondo Toshio (Anjo JPX) Kobayashi Akio (Kariya JPX), Method for preventing overheating of an exhaust purifying device.
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Kondo Toshio (Anjo JPX) Kobayashi Akio (Kariya JPX) Eino Tomomi (Kariya JPX) Fukue Naofumi (Chiryu JPX), Method of feedback controlling air-fuel ratio.
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Ninomiya Masakazu (Kariya JPX), Optimum air-fuel ratio control for internal combustion engine.
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Felger Gnter (Leonberg DEX) Glckler Otto (Renningen DEX) Kauff Helmut (Schwieberdingen DEX) Kiencke Uwe (Ludwigsburg DEX) Knapp Heinrich (Leonberg DEX) Stocker Herbert (Leonberg DEX), Regulating device for a fuel metering system.
이 특허를 인용한 특허 (7)
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Gregory G. Hafner ; Brian G. McGee, Accurate deliver of total fuel when two injection events are closely coupled.
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Kevin P. Duffy ; Brian G. McGee ; Matthew R. Roth, Apparatus and method for controlling fuel injection signals during engine acceleration and deceleration.
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Stewart,Gregory E.; Shahed,Syed M.; Kolavennu,Soumitri N., Calibration of engine control systems.
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Machida, Kenichi; Hirakata, Yoshiaki; Yuhara, Tomomi; Abe, Masahiko, Fuel injection control apparatus.
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Brian G. McGee, Method and apparatus for controlling overlap of two fuel shots in multi-shot fuel injection events.
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Yasuoka Akimasa (Tokyo JPX) Kiuchi Takeo (Tokyo JPX), Method for controlling air/fuel ratio of fuel supply for an internal combustion engine.
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Ohishi Hiroshi (Hohya JPX), Method for controlling fuel injection for automotive engines.
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