 |
This is a good waveform |
 View larger image
 Download this waveform file for use with PicoScope
Knock Sensor Waveform Notes
The optimal point at which the High Tension (HT) ignites the Air/Fuel mixture will be just before pinking occurs, it would appear inevitable that at certain times and under certain conditions knock (detonation) will occur.
A knock sensor is fitted to some management systems, the sensor being a small piezo-electrical device that, when coupled with the Electronic Control Modules (ECM), can identify when knock occurs and retard the ignition timing accordingly.
The frequency of knocking (pinking) is approximately 15 KHz. As the response of the sensor is very fast an appropriate time scale must be set, in the case of the example waveform 0-500 ms and a 0-5 volt scale. The best way to test a knock sensor is to remove the knock sensor from the engine and to tap it with a small spanner, the resultant waveform should be similar to the example shown.
NOTE: When refitting the sensor tighten to the correct torque setting as over tightening can damage the sensor.
汽車診斷 | 汽車診斷儀 | 汽車故障診斷儀 | 汽車測試儀 | 汽車分析儀 | 汽車診斷示波器 | 汽車電路測試儀 | 汽車電路分析儀 | 發(fā)動機(jī)分析儀 | 發(fā)動機(jī)綜合分析儀 | 發(fā)動機(jī)檢測中心 | 點火分析儀 | 點火測試儀 | 汽車傳感器測試儀 | CAN總線示波器 | LIN總線示波器 | 汽車故障記錄儀 | 汽車傳感器分析儀 | 汽車檢測儀 | 噴油嘴測試儀 | 點火線圈測試儀 | 蓄電池測試儀 | 發(fā)電機(jī)測試儀 | 起動機(jī)測試儀 | ABS傳感器測試儀 | ECU測試儀 | ECM測試儀 | 進(jìn)氣真空/壓力測試儀 | 排氣壓力測試儀 | 汽車技術(shù)培訓(xùn) | 爆震傳感器測試儀 | 缺火測試儀 | 缺缸測試儀 | 線路測試儀 | 引出線 | 汽車數(shù)字示波器 | 真空傳感器 | 高壓感應(yīng)測試頭 | 無分電器點火測試頭 | 獨立點火（COP）感應(yīng)測試頭 | 漏電測試儀 | 氣缸相對壓縮測試 | 電腦測試儀 | 發(fā)動機(jī)控制器測試儀 | 泄漏測試儀 | 熒光檢漏 | 超聲波檢漏 | 汽車數(shù)字萬用表 | 電流鉗表 | 電流勾表 | 點火正時燈 |
