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Knock constrains engine performance and efficiency. Severe knock is potentially damaging to the engine. Traditionally, knock has been detected with either a piezoelectric transducer or an accelerometer. However, knock can also be detected with an ionization probe. For a piezoelectric transducer, knock is characterized by ringing on the combustion pressure signal where the amplitude of the ringing indicates knock intensity. This classical ring of knock can also be detected on an ion curve. Similarly, the amplitude of the ringing on the ion curve also indicates knock intensity. Ionization can detect knock on a cycle-bycycle basis, but technical difficulties have forced most ionization systems to use heavy averaging and/or filtering, destroying the classic ring signature of knock. However, certain ionization sensing ignition systems are able to accomplish robust ionization sensing without resorting to excessive filtering or averaging. In these systems, characteristic knock ring frequencies are preserved. This preservation provides the ability to offer closed loop knock control. The unique nature of the knock detection on the ion curve is the key to easy calibration on an engine. Once calibrated, a percentage of light knock can be used with closed loop control of the timing to avoid heavy knock. This control can extend the performance and efficiency of an engine by allowing the engine to further approach the knock limit without damaging the engine.
Your Price $195.00
List Price $195.00