JPS6449929A - Knocking detecting device for engine - Google Patents
Knocking detecting device for engineInfo
- Publication number
- JPS6449929A JPS6449929A JP20593287A JP20593287A JPS6449929A JP S6449929 A JPS6449929 A JP S6449929A JP 20593287 A JP20593287 A JP 20593287A JP 20593287 A JP20593287 A JP 20593287A JP S6449929 A JPS6449929 A JP S6449929A
- Authority
- JP
- Japan
- Prior art keywords
- output
- knocking
- filter
- engine
- exhaust gas
- 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
- Testing Of Engines (AREA)
Abstract
PURPOSE:To improve knocking detection accuracy by varying the frequency band or reference level of a knocking sensor according to the temperature of exhaust gas, etc. CONSTITUTION:The output of a knocking sensor 1 which is mounted on the cylinder block, etc., of the engine and detects vibration is inputted to a multiplexer 5 through an amplifying circuit 2 and a 1st filter of 12kHz peak frequency or 2nd filter 4 of 14kHz peak frequency. A control unit 7 controls the multiplexer 5 so that the output of the 1st filter 3 when the output of an exhaust gas sensor 8 is <=700 deg.C or the output of the 2nd filter 4 when >=700 deg.C is selected and inputted to a peak holding circuit 6. The control unit 7 performs knocking detection according to the output of a peak holding circuit 6. The knocking frequency varies with the combustion temperature and pressure in the engine, so the accurate detection is performed by varying the frequency band according the exhaust gas temperature and suction pressure.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20593287A JPS6449929A (en) | 1987-08-19 | 1987-08-19 | Knocking detecting device for engine |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP20593287A JPS6449929A (en) | 1987-08-19 | 1987-08-19 | Knocking detecting device for engine |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6449929A true JPS6449929A (en) | 1989-02-27 |
Family
ID=16515121
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP20593287A Pending JPS6449929A (en) | 1987-08-19 | 1987-08-19 | Knocking detecting device for engine |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6449929A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06108915A (en) * | 1992-09-30 | 1994-04-19 | Hitachi Ltd | Knocking detecting method and ignition timing control method for internal combustion engine |
CN103758641A (en) * | 2014-01-14 | 2014-04-30 | 上海交通大学 | Gasoline engine knocking judging and occurrence time predicting method considering influence of external exhaust gas recirculation (EGR) |
-
1987
- 1987-08-19 JP JP20593287A patent/JPS6449929A/en active Pending
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06108915A (en) * | 1992-09-30 | 1994-04-19 | Hitachi Ltd | Knocking detecting method and ignition timing control method for internal combustion engine |
CN103758641A (en) * | 2014-01-14 | 2014-04-30 | 上海交通大学 | Gasoline engine knocking judging and occurrence time predicting method considering influence of external exhaust gas recirculation (EGR) |
CN103758641B (en) * | 2014-01-14 | 2016-02-10 | 上海交通大学 | A kind of Engine Knock comprising external exhaust gas recirculation impact judges and the Forecasting Methodology in moment occurs |
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