Engine dilution control by combustion pressure harmonic amplitud

Details Engine dilution control by combustion pressure harmonic amplitud Engine dilution control by combustion pressure harmonic amplitud

1986-11-17

1987-10-13

Dolinar, Andrew M.

Internal-combustion engines

Charge forming device

Including cylinder pressure or temperature responsive means

F02D 4114

Patent

active

046991077

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

REFERENCES:
patent: 4061116 (1977-12-01), Saida et al.
patent: 4531499 (1985-07-01), Eckert et al.
patent: 4624229 (1986-11-01), Matekunas

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