Question

3. a) The knock resonance frequency for an SI engine can be determined from [10 rn the relation I. CoNT/273 d where Co is the speed of sound at 273 K, T is the temperature in Kelvin inside the combustion chamber, d is the cylinder diameter, and P are the Bessel functions. For a given Si engine, the temperature inside the combustion chamber is 2227 C and the cylinder has a diameter of 89 mm. The values of the first three Bessel functions are: A0:0586], β ,-0.9722, βο-|.2197. Determine the first three knock resonance frequencies. Assume Co-330 m/s. b) Describe the two schemes (fast and slow) of electronic engine knock control system with necessary diagrams.

Answer 1

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