JPS5629154A - Control unit for air fuel ratio - Google Patents

Control unit for air fuel ratio

Info

Publication number
JPS5629154A
JPS5629154A JP10501279A JP10501279A JPS5629154A JP S5629154 A JPS5629154 A JP S5629154A JP 10501279 A JP10501279 A JP 10501279A JP 10501279 A JP10501279 A JP 10501279A JP S5629154 A JPS5629154 A JP S5629154A
Authority
JP
Japan
Prior art keywords
value
control
switching
stability
taking
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
JP10501279A
Other languages
Japanese (ja)
Inventor
Shoji Furuhashi
Hideyuki Tamura
Toshio Enoshima
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nissan Motor Co Ltd
Original Assignee
Nissan Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Nissan Motor Co Ltd filed Critical Nissan Motor Co Ltd
Priority to JP10501279A priority Critical patent/JPS5629154A/en
Publication of JPS5629154A publication Critical patent/JPS5629154A/en
Pending legal-status Critical Current

Links

Landscapes

  • Measuring Oxygen Concentration In Cells (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

PURPOSE: To simplify the control and to increase the stability at control switching, by stopping the closed loop control when the maximum value of output voltage of exhaust sensor due to current flowing is less than the specified value.
CONSTITUTION: The constant voltage Vc is divided with resistances R1 and R2, and fed to the exhaust sensor 15 represented in the internal resistance R3 and electromotive force V2, and appearent output voltage V0 is obtained from the terminal 18. In this case, taking the leakage current of the operational amplifier A1 as IA, the voltage V0 is V0=R0V2/(R0+R3)+R3V1/(R0+R3)+R0R3IA/ (R0+R3). Taking VR and VL as the value of V0 at the over concentrated and dilute states of mixed gas, as the resistance R3 approaches the infinite with the temperature decrease, the value of V0 converges to V1, and VR is greater and VL is smaller with temperature rise. Accordingly, by deciding the value of VR, VSH corresponding to the temperature when the closed loop control is switched into open control, and by switching when the maximum value VR of V0 is less than VSH, the stability at switching can be made with a simple operation.
COPYRIGHT: (C)1981,JPO&Japio
JP10501279A 1979-08-20 1979-08-20 Control unit for air fuel ratio Pending JPS5629154A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10501279A JPS5629154A (en) 1979-08-20 1979-08-20 Control unit for air fuel ratio

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10501279A JPS5629154A (en) 1979-08-20 1979-08-20 Control unit for air fuel ratio

Publications (1)

Publication Number Publication Date
JPS5629154A true JPS5629154A (en) 1981-03-23

Family

ID=14396149

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10501279A Pending JPS5629154A (en) 1979-08-20 1979-08-20 Control unit for air fuel ratio

Country Status (1)

Country Link
JP (1) JPS5629154A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59126048A (en) * 1982-12-29 1984-07-20 Toyota Motor Corp Air-fuel ratio controlling method for internal- combustion engine for vehicle
JPS617695U (en) * 1984-06-20 1986-01-17 本田技研工業株式会社 Joint device in mold

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59126048A (en) * 1982-12-29 1984-07-20 Toyota Motor Corp Air-fuel ratio controlling method for internal- combustion engine for vehicle
JPH0429856B2 (en) * 1982-12-29 1992-05-20
JPS617695U (en) * 1984-06-20 1986-01-17 本田技研工業株式会社 Joint device in mold

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