JPS57186126A - Knock detector - Google Patents
Knock detectorInfo
- Publication number
- JPS57186126A JPS57186126A JP7092681A JP7092681A JPS57186126A JP S57186126 A JPS57186126 A JP S57186126A JP 7092681 A JP7092681 A JP 7092681A JP 7092681 A JP7092681 A JP 7092681A JP S57186126 A JPS57186126 A JP S57186126A
- Authority
- JP
- Japan
- Prior art keywords
- knock
- output
- specific frequency
- amplitude level
- threshold value
- 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
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
- G01L23/22—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
- G01L23/221—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines
- G01L23/225—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines circuit arrangements therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H1/00—Measuring characteristics of vibrations in solids by using direct conduction to the detector
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Mechanical Vibrations Or Ultrasonic Waves (AREA)
- Testing Of Engines (AREA)
- Electrical Control Of Ignition Timing (AREA)
Abstract
PURPOSE:To achieve accurate knock detection by deciding on a threshold value easily without paying attention to the influence of an increase in amplitude level caused by some factor except a knock, by finding the amount of variation in amplitude level in the specific frequency band of an oscillation signal. CONSTITUTION:The vibration of an internal combustion engine is transduced into an electric signal by an electric signal trnsducing part 1, and an amplitude level at specific frequency is extracted by a specific frequency extraction part 2. A sampling part 3 samples the output of the specific frequency extraction part 2 at constant intervals of time to output sampled values Si successively. A variation amount calculation part 4 sends out the absolute value di=¦Si-Si-1¦ of a difference between the last output Si-1 and new output Si of the sampling part 3. A knock discrimination part 5 detects a knock when the output di of the variation amount calculation part 4 surpasses a predetermined threshold value, and then outputs a knock detection signal.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7092681A JPS57186126A (en) | 1981-05-12 | 1981-05-12 | Knock detector |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7092681A JPS57186126A (en) | 1981-05-12 | 1981-05-12 | Knock detector |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57186126A true JPS57186126A (en) | 1982-11-16 |
Family
ID=13445595
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7092681A Pending JPS57186126A (en) | 1981-05-12 | 1981-05-12 | Knock detector |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57186126A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62277535A (en) * | 1986-03-28 | 1987-12-02 | ソシエテ、デテユ−ド・ドウ・マシ−ヌ・テルミツク・エス.ウ.エム.テ−. | Method of monitoring operation of internal combustion engineunder usage |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54141180A (en) * | 1978-04-24 | 1979-11-02 | Nippon Soken | Knocking detector for internal combustion engine |
-
1981
- 1981-05-12 JP JP7092681A patent/JPS57186126A/en active Pending
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54141180A (en) * | 1978-04-24 | 1979-11-02 | Nippon Soken | Knocking detector for internal combustion engine |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS62277535A (en) * | 1986-03-28 | 1987-12-02 | ソシエテ、デテユ−ド・ドウ・マシ−ヌ・テルミツク・エス.ウ.エム.テ−. | Method of monitoring operation of internal combustion engineunder usage |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
FR2403683A1 (en) | OVERLOAD DETECTION CIRCUIT FOR PWM TYPE AMPLIFIER | |
JPS5693079A (en) | Measurement of time duration | |
JPS5487308A (en) | Knocking detector for internal combustion engine | |
EP0720734A1 (en) | Knock detection method and apparatus with dual integration windows | |
US4444042A (en) | Engine-knock detection method and apparatus | |
JPS57186126A (en) | Knock detector | |
JPS54103911A (en) | Knock detector and ignition time controller for internal combustion engine | |
JPS57355A (en) | Injection timing detector | |
WO1991013363A3 (en) | Signal conditioning circuit | |
JPS5494212A (en) | Discriminator for voice or voiceless condition | |
JPS6464581A (en) | Revolution counter for dc motor | |
FR2178410A5 (en) | ||
JPS5742821A (en) | Knocking vibration detector | |
JPS55118100A (en) | Periodic adjustment and setting of new operation level for detection threshold | |
JPS57132005A (en) | Detector for extent of movement | |
JPS56162264A (en) | Ignition timing controller | |
JPS6454227A (en) | Knocking detector for engine | |
JPS5742822A (en) | Knocking vibration detector | |
RU2078323C1 (en) | Method to reveal knocking in integral combustion engine with spark ignition | |
JPS5752838A (en) | Method for detecting surge phenomenon of supercharger | |
JPS562469A (en) | Knocking detector | |
JPS55163427A (en) | Detecting method of and apparatus for knocking of engine | |
JPS57200826A (en) | Knocking detecting device | |
JPS5654964A (en) | Ignition system with knocking signal detector | |
JPS5664621A (en) | Detecting device of knocking in internal combustion engine |