Internal-combustion engines – Charge forming device – Exhaust gas used with the combustible mixture
Patent
1997-09-11
1999-07-13
Dollnar, Andrew M.
Internal-combustion engines
Charge forming device
Exhaust gas used with the combustible mixture
701108, F02D 2108, F02M 2507
Patent
active
059212233
ABSTRACT:
A control apparatus for an internal combustion engine with an exhaust gas recirculation system is disclosed. The control apparatus grasps an optimum relational expression between an excess air ratio and an EGR rate in a transient engine operating condition changing to a certain engine operating condition. Each combination of the excess air ratio and the EGR rate on the relational expression optimizes an amount of generated paticulates and an amount of generated NO.sub.x. The relational expression contains a combination of an optimum excess air ratio and an optimum EGR rate in the certain engine operating condition. The apparatus determines one of a current excess air ratio and a current EGR rate and controls the exhaust gas recirculation system so as to realize the other of an excess air ratio and an EGR rate satisfying the relational expression with respect to one of the current excess air ratio and the current EGR rate.
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Castro Arnold
Dollnar Andrew M.
Toyota Jidosha & Kabushiki Kaisha
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