Engine dilution control by combustion pressure harmonic amplitude ratio

摘要: A charge dilution control for an internal combustion engine subjects a pressure signal to multiple switched capacitor bandpass filters with frequencies controlled in phase lock loop from speed generate harmonic wave signals at which are constant multiples of the varying firing frequency. The amplitude ratio between peaks two harmonics, one preferably fundamental frequency, is used apparatus such as EGR or variable valve lift maintain predetermined ratio. compared may be higher subharmonic. Ignition timing difference zero harmonics second and fourth.