3/11/2023 0 Comments Knock sensor microphonePulling an injector can be a pain but pulling a spark plug or throttle body and sticking a mic (or endoscope) nearby should be a breeze in comparison. Those of us with hearing loss can use the spectral graph to compare with a good injector. With a good headset and ears you should be able to hear the spray and tell if it's crisp or dribbly due to a sticky pintle. How about putting a mic on the end of a gooseneck and sticking it near the output of the injector and triggering it with a pulser? Run the mic through an amp then split the output to both headphones and an audio app that can do a spectral graph. To me it sounds like (pun intended) an electret microphone element. You want a wide band sensor that's cheap, has a flat response curve, and standardized. An injector event covers a wide frequency range - the pintle movement and the spray.Ĭ. You are trying to interpret audio into a visual means.ī. I'm not an auto mechanic by trade so bear with me.Ī. That's all I had prepared at the start of this reply so now I need to type out loud to organize my thoughts. On top of that, a simple trace will only show amplitude, and a higher trace only shows what that particular sensor thinks is loud within it's sensitivity range AND that range may not be linear and can be effected by it's own resonance. Using a knock sensor, which is tuned for events of a much lower frequency, will filter out the very data you are trying to read. Please pardon my ignorance but it seems that you are limiting yourself.
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