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Authors
Stotsky, Alexander

Identifier
10.3182/20070820-3-US-2918.00044

Index Terms
trigonometric interpolation,filtering techniques,engine knock,six sigma,spark ignition engines

Abstract
A knock detection circuit which is based on the signal of the accelerometer installed on the engine block of spark ignition automotive engine has a band-pass filter with a certain frequency as a parameter to be calibrated. New statistical method for determination of the frequency which is the most suitable for the knock detection in real-time applications is proposed. The knock detectability is associated with a statistical hypothesis for testing the equality of two mean values, i.e., mean values of the amplitudes for knocking and nonknocking cycles, and signal-to-noise ratio is associated with the value of the statistic. The frequency with the largest signal-to-noise ratio is chosen for implementation in the engine knock detection circuit.

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