JPS6454227A - Knocking detector for engine - Google Patents
Knocking detector for engineInfo
- Publication number
- JPS6454227A JPS6454227A JP21181487A JP21181487A JPS6454227A JP S6454227 A JPS6454227 A JP S6454227A JP 21181487 A JP21181487 A JP 21181487A JP 21181487 A JP21181487 A JP 21181487A JP S6454227 A JPS6454227 A JP S6454227A
- Authority
- JP
- Japan
- Prior art keywords
- knocking
- engine
- peak level
- filters
- band pass
- 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)
- Electrical Control Of Ignition Timing (AREA)
Abstract
PURPOSE:To enable positive detection of possible fine knocking with a higher S/N ratio in the detection of knocking, by providing a means to set a filter band of a band pass filter narrower and altering the filter band. CONSTITUTION:A knocking sensor 15 is mounted at a cylinder 2 portion of an engine 1 to detect vibration of the engine 1 and peak level of engine vibration signals passing through three band pass filters 17S1, 17M and 17S2 is detected with a peak level detection circuit 18. Then, a knocking frequency detection circuit 20 detects an actual frequency of generated knocking vibration from three peak level values and cutoff frequencies of three filters and a cutoff frequency alteration circuit 21 alters cutoff frequencies of the three filters. A knocking decision circuit 19 compares a peak level of an output of the band pass filter 17M with a reference value corresponding to the moment of generating a knocking a decide on the movement of generating knocking.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21181487A JPS6454227A (en) | 1987-08-25 | 1987-08-25 | Knocking detector for engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21181487A JPS6454227A (en) | 1987-08-25 | 1987-08-25 | Knocking detector for engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6454227A true JPS6454227A (en) | 1989-03-01 |
Family
ID=16612036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21181487A Pending JPS6454227A (en) | 1987-08-25 | 1987-08-25 | Knocking detector for engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6454227A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH048850A (en) * | 1990-04-27 | 1992-01-13 | Hitachi Ltd | Knocking detecting means for internal combustion engine |
| JP2011140960A (en) * | 2000-08-11 | 2011-07-21 | Robert Bosch Gmbh | Method and device for identifying knocking of internal combustion engine having at least one cylinder |
-
1987
- 1987-08-25 JP JP21181487A patent/JPS6454227A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH048850A (en) * | 1990-04-27 | 1992-01-13 | Hitachi Ltd | Knocking detecting means for internal combustion engine |
| JP2011140960A (en) * | 2000-08-11 | 2011-07-21 | Robert Bosch Gmbh | Method and device for identifying knocking of internal combustion engine having at least one cylinder |
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