Control device for exhaust gas recycled internal combustion engine
AssigneeYamaha Hatsukoko Kabushiki Kaisha
InventorsHiromitsu Matsumoto, Keiichi Sugiyama
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Abstract
An internal combustion engine having a relatively large main induction system that supplies the engine charge requirements at partial and full load and a relatively small cross-sectional area auxiliary induction system that provides the charge requirements at idle and low load conditions. An exhaust gas recirculating system is also incorporated with a control whereby exhaust gases are recirculated to the engine combustion chambers only at the time when the auxiliary induction system is supplying the major portion of the engine charge requirements. This permits effective combustion control without necessitating modifications to the conventional spark timing device of the engine.
Claims10
In an internal combustion engine having a variable volume chamber in which combustion occurs, a main intake passage communicating with said chamber through a main intake port for delivering a charge thereto, an auxiliary intake passage communicating with said chamber through an auxiliary intake port, said auxiliary intake passage having an effective cross-sectional area substantially less than the effective cross-section area of said main intake passage for causing a given mass flow of charge through said auxiliary intake port to enter said chamber at a significantly greater velocity, an emission system for discharging a gas for further treatment by combustion within said chamber, valve means for controlling the ratio of communication of said auxiliary and main intake passages with said chambers during a given cycle of operation, and conduit means for delivering the gases from said emission system to said chamber, the improvement comprising means for precluding flow of said emission system gases to said chamber when a substantial portion of the chamber charge is being supplied by said main intake passage.
Dependencies are inferred from the claim text.