JPS5467826A - Operation diagnosis system for exhaust gas re-circulation valve - Google Patents
Operation diagnosis system for exhaust gas re-circulation valveInfo
- Publication number
- JPS5467826A JPS5467826A JP13457377A JP13457377A JPS5467826A JP S5467826 A JPS5467826 A JP S5467826A JP 13457377 A JP13457377 A JP 13457377A JP 13457377 A JP13457377 A JP 13457377A JP S5467826 A JPS5467826 A JP S5467826A
- Authority
- JP
- Japan
- Prior art keywords
- negative pressure
- load
- egr valve
- valve
- intake
- 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
- Exhaust-Gas Circulating Devices (AREA)
Abstract
PURPOSE: To provide an operation diagnosis apparatus, which permits diagnosis of the operation of an EGR valve in the loaded state of a vehicle simply by checking whether the operation is right or not through measurement of the difference in the intake negative pressure between the operative and inoperative states of the EGR valve.
CONSTITUTION: In a system provided with a carburetor 1, a throttle vlave 2, a negative pressure passage 3, an EGR valve 4, an EGR passage 5 and an engine 6, a running resistance load is applied to the engine 6 by a diamometer 7, and the load can be set to a desired value by suitably selecting the combination of load selection switches 8 with a processing unit 9. The throttle valve 2 is controlled through a control unit 10, and the intake load is detected by a negative pressure converter 11, the output of which is coupled to the processing unit 9. At the time of the diagnosis, the intake negative pressure values of the loads B and C are compared, and the operative and inoperative states of the EGR valve 4 are diagnosed from the size of the difference. Load A represents intake negative pressure at the time of the operation of the valve 4.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13457377A JPS5467826A (en) | 1977-11-11 | 1977-11-11 | Operation diagnosis system for exhaust gas re-circulation valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13457377A JPS5467826A (en) | 1977-11-11 | 1977-11-11 | Operation diagnosis system for exhaust gas re-circulation valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5467826A true JPS5467826A (en) | 1979-05-31 |
Family
ID=15131498
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13457377A Pending JPS5467826A (en) | 1977-11-11 | 1977-11-11 | Operation diagnosis system for exhaust gas re-circulation valve |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5467826A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63111274A (en) * | 1986-10-28 | 1988-05-16 | Daihatsu Motor Co Ltd | Diagnostic method for trouble of exhaust gas recirculation control device |
-
1977
- 1977-11-11 JP JP13457377A patent/JPS5467826A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63111274A (en) * | 1986-10-28 | 1988-05-16 | Daihatsu Motor Co Ltd | Diagnostic method for trouble of exhaust gas recirculation control device |
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