Internal-combustion engines – Charge forming device – Including cylinder pressure or temperature responsive means
Patent
1983-12-29
1985-12-10
Lall, Parshotam S.
Internal-combustion engines
Charge forming device
Including cylinder pressure or temperature responsive means
73 35, 123436, F02M 700, G01M 1500
Patent
active
045572364
ABSTRACT:
A servo control which adjusts the supply of combustion diluent (either excess air or EGR) upwards until the statistical variation of flame speed achieves a set limit. The system is intended as a control coefficient input to an automatic control system capable of more rapid dynamic response than the roughness controller itself. For engines characterized by exceptional homogeneity and in-cylinder flow control, control of flame speed variability up to set limit nearly minimizes NO.sub.x emissions and very nearly optimizes fuel efficiency at all engine speeds and loads. Two "measures" of flame speed are disclosed, first peak blowdown pressure in the exhaust, and second, the ionization breakdown voltage of an additional spark fired a specified number of crank angles after the ignition spark.
REFERENCES:
patent: 2517976 (1950-08-01), Clarke
patent: 4153013 (1979-05-01), Bianchi et al.
patent: 4161162 (1979-07-01), Latsch et al.
patent: 4232545 (1980-11-01), Dobler et al.
patent: 4233943 (1980-11-01), Rogora et al.
patent: 4314534 (1982-02-01), Nakajima et al.
Automotive Engine Associates
Lall Parshotam S.
Wolfe W. R.
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