JPS5762945A - Fail-safe system for o2-sensor of air-fuel ratio controlling system for internal combustion engine - Google Patents
Fail-safe system for o2-sensor of air-fuel ratio controlling system for internal combustion engineInfo
- Publication number
- JPS5762945A JPS5762945A JP12657580A JP12657580A JPS5762945A JP S5762945 A JPS5762945 A JP S5762945A JP 12657580 A JP12657580 A JP 12657580A JP 12657580 A JP12657580 A JP 12657580A JP S5762945 A JPS5762945 A JP S5762945A
- Authority
- JP
- Japan
- Prior art keywords
- air
- fuel ratio
- sensor
- signal
- producing
- 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 the air-fuel ratio from being controlled to an abnormal value, by producing an O2- sensor abnormality signal when the temperature of cooling water is high and the following conditions are satisfied that the air-fuel ratio is not under open loop control and an activation signal of the O2- sensor is not given continuously for a prescribed time period.
CONSTITUTION: An air-fuel ratio controlling system shown in the drawing comprises an ECU (electronic control unit) 6 which controls a pulse motor 5 for operating an air-fuel ratio controlling valve attached to a carburetor so as to feedback control the air-fuel ratio to a required value in response to an output signal V of an O2- sensor. The ECU6 includes an O2- sensor activation detecting circuit 61 for producing an activation signal of the O2- sensor and an engine condition detecting circuit 65 for detecting the open loop control of the air-fuel ratio. Further, the ECU6 is provided additionally with a fail-safe system A, which includes an abnormal ity judging circuit 75 for producing an abnormality signal when a high-temperature signal is produced by a circuit 74 for detecting the temperature of cooling water and the following conditions are satisfied that not open-looped signal is given and no activation signal is given continuously for a prescribed time period.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12657580A JPS5762945A (en) | 1980-09-10 | 1980-09-10 | Fail-safe system for o2-sensor of air-fuel ratio controlling system for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12657580A JPS5762945A (en) | 1980-09-10 | 1980-09-10 | Fail-safe system for o2-sensor of air-fuel ratio controlling system for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5762945A true JPS5762945A (en) | 1982-04-16 |
Family
ID=14938554
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12657580A Pending JPS5762945A (en) | 1980-09-10 | 1980-09-10 | Fail-safe system for o2-sensor of air-fuel ratio controlling system for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5762945A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7103467B2 (en) * | 2004-03-25 | 2006-09-05 | Denso Corporation | Device for detecting response characteristics of sensor |
-
1980
- 1980-09-10 JP JP12657580A patent/JPS5762945A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7103467B2 (en) * | 2004-03-25 | 2006-09-05 | Denso Corporation | Device for detecting response characteristics of sensor |
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