JPS5741440A - Air fuel ratio controller for internal combustion engine - Google Patents
Air fuel ratio controller for internal combustion engineInfo
- Publication number
- JPS5741440A JPS5741440A JP11687780A JP11687780A JPS5741440A JP S5741440 A JPS5741440 A JP S5741440A JP 11687780 A JP11687780 A JP 11687780A JP 11687780 A JP11687780 A JP 11687780A JP S5741440 A JPS5741440 A JP S5741440A
- Authority
- JP
- Japan
- Prior art keywords
- valve
- over
- fuel ratio
- fresh air
- air fuel
- 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 an engine from stop and a catalytic converter from overheat in idling or the like by introducing fresh air into an exhaust manifold.
CONSTITUTION: A manifold change-over valve 18 comprising first and second change-over valves 26, 28 is changed over to the exhaust manifold 22 side according to throttle valve full-closing signal or the like of a throttle sensor 6. Also, an air fuel ratio ratio controller comprising a control circuit 13 and the like for changing over the valve 18 to the intake manifold 20 side according to rich air fuel ratio signals of an O2 sensor 8 is provided to introduce fresh air into the exhaust manifold 22 in idling or the like. When a valve 32 is closesd in the idling or the like, the output full closing signal is generated from the sensor 6 and the circuit 12 sends the output change-over signal to a negative pressure changing-over valve 36 which is changed over to introduce negative pressure applied to a port 38 into a diaphragm chamber in the valve 28. Then, the valve 28 is opened corresponding to the size of the negative pressure to open a fresh air introducing path 4 for exhaust and introduce fresh air into pipe 22. Thus, fresh air is introduced into the intake manifold 20 in deceleration or the like to prevent an engine from stop without providing lean air fuel ratio.
COPYRIGHT: (C)1982,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11687780A JPS5741440A (en) | 1980-08-25 | 1980-08-25 | Air fuel ratio controller for internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11687780A JPS5741440A (en) | 1980-08-25 | 1980-08-25 | Air fuel ratio controller for internal combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5741440A true JPS5741440A (en) | 1982-03-08 |
Family
ID=14697839
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11687780A Pending JPS5741440A (en) | 1980-08-25 | 1980-08-25 | Air fuel ratio controller for internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5741440A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0433772A2 (en) * | 1989-12-06 | 1991-06-26 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification system for an internal combustion engine |
| US5331809A (en) * | 1989-12-06 | 1994-07-26 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification system for an internal combustion engine |
-
1980
- 1980-08-25 JP JP11687780A patent/JPS5741440A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0433772A2 (en) * | 1989-12-06 | 1991-06-26 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification system for an internal combustion engine |
| US5331809A (en) * | 1989-12-06 | 1994-07-26 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purification system for an internal combustion engine |
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