Knock Detection in Spark Ignition Engines Base on Complementary Ensemble Empirical Mode Decomposition-Hilbert Transform

Figure 16

(a) Hilbert transform results of IMF1 for cylinder pressure signal of cylinder 1. (b) Hilbert transform results of IMF1 for cylinder pressure signal of cylinder 2. (c) Hilbert transform results of IMF1 for cylinder pressure signal of cylinder 3. (d) Hilbert transform results of IMF1 for cylinder pressure signal of cylinder 4.

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