JPS5578140A - Circuit breakage detection for air/fuel sensor - Google Patents

Circuit breakage detection for air/fuel sensor

Info

Publication number
JPS5578140A
JPS5578140A JP15289978A JP15289978A JPS5578140A JP S5578140 A JPS5578140 A JP S5578140A JP 15289978 A JP15289978 A JP 15289978A JP 15289978 A JP15289978 A JP 15289978A JP S5578140 A JPS5578140 A JP S5578140A
Authority
JP
Japan
Prior art keywords
air
comparator
circuit
detection voltage
fuel ratio
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
JP15289978A
Other languages
Japanese (ja)
Inventor
Takashi Wakabayashi
Masao Tsujii
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.)
Denso Corp
Original Assignee
NipponDenso 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 NipponDenso Co Ltd filed Critical NipponDenso Co Ltd
Priority to JP15289978A priority Critical patent/JPS5578140A/en
Publication of JPS5578140A publication Critical patent/JPS5578140A/en
Pending legal-status Critical Current

Links

Abstract

PURPOSE: To prevent erroneous detection by the method wherein when the air/fuel ratio sensor terminal voltage has risen from No.1 emergency detection voltage, which is set higher than the normal detection voltage, to No.2 emergency detection voltage, which is set still higher, within a certain time, it is judged as a circuit breakage.
CONSTITUTION: When an open circuit has occurred in air/fuel ratio sensor 10 of air/fuel ratio detection unit 1, its terminal voltage VIN1, that is, output VIN2 of buffer 402 of open circuit detection circuit 4, exceeds No.1 emergency detection voltage VC1, which is the comparison level of No.1 comparator 409, and at the same time, within delay time TD2, which is determined by No.3 comparator 417, it also exceeds No.2 emergency detection voltage VC2, which is the comparison level of No.2 comparator 420. That is, because the time required for VC1 to reach VC2 is within fixed delay time TD2, No.2 comparator 420 outputs decision signal V0 informing of an open circuit, and the number of open circuits, including poor contacts, are stored in and displayed by memory-display circuit 5.
COPYRIGHT: (C)1980,JPO&Japio
JP15289978A 1978-12-08 1978-12-08 Circuit breakage detection for air/fuel sensor Pending JPS5578140A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP15289978A JPS5578140A (en) 1978-12-08 1978-12-08 Circuit breakage detection for air/fuel sensor

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP15289978A JPS5578140A (en) 1978-12-08 1978-12-08 Circuit breakage detection for air/fuel sensor

Publications (1)

Publication Number Publication Date
JPS5578140A true JPS5578140A (en) 1980-06-12

Family

ID=15550558

Family Applications (1)

Application Number Title Priority Date Filing Date
JP15289978A Pending JPS5578140A (en) 1978-12-08 1978-12-08 Circuit breakage detection for air/fuel sensor

Country Status (1)

Country Link
JP (1) JPS5578140A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61118540A (en) * 1984-11-15 1986-06-05 Nissan Motor Co Ltd Air-fuel ratio controller for internal-combustion engine
JPH06129286A (en) * 1992-09-18 1994-05-10 Kohler Co Mixture control system of internal combusion engine
US7233151B2 (en) 2005-11-11 2007-06-19 Hyundai Motor Company Apparatus and method for diagnosing failure of fuel level sensors

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS61118540A (en) * 1984-11-15 1986-06-05 Nissan Motor Co Ltd Air-fuel ratio controller for internal-combustion engine
JPH06129286A (en) * 1992-09-18 1994-05-10 Kohler Co Mixture control system of internal combusion engine
US7233151B2 (en) 2005-11-11 2007-06-19 Hyundai Motor Company Apparatus and method for diagnosing failure of fuel level sensors

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