Engine control system and method with atmospheric humidity compe

Details Engine control system and method with atmospheric humidity compe Engine control system and method with atmospheric humidity compe

1998-10-15

2000-05-16

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

12340612, 12340655, 12356824, F02M 2507, F02P 515

Patent

active

060622040

ABSTRACT:
An internal combustion engine includes an exhaust gas recirculation (EGR) mechanism for directing a controlled amount of exhaust gas generated by the engine from the exhaust manifold to an intake manifold of the engine. An electronic engine controller (EEC) controls the EGR by determining a base EGR rate as a function of a plurality of engine operating parameters. The base EGR rate is then modified by a multiplier to compensate the EGR rate for the effect of humidity. The multiplier represents the EGR percent change per grain of humidity deviation from a predetermined humidity level. The EEC further controls the borderline spark timing of the engine by determining a base spark timing as a function of a plurality of engine operating parameters at a predetermined humidity level. The spark rate is then modified by a multiplier to compensate the spark timing for the effect of humidity. The multiplier represents the degree of spark change per grains of humidity possible without incurring engine knock.

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