JPS5578140A - Circuit breakage detection for air/fuel sensor - Google Patents
Circuit breakage detection for air/fuel sensorInfo
- 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
Links
Landscapes
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
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
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)
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 |
-
1978
- 1978-12-08 JP JP15289978A patent/JPS5578140A/en active Pending
Cited By (3)
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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