Engine intake apparatus

Details Engine intake apparatus Engine intake apparatus

1993-09-22

1995-06-06

Kamen, Noah P.

Internal-combustion engines

Intake manifold

Manifold tuning, balancing or pressure regulating means

123 9017, 1235591, 12318431, F02B 7518

Patent

active

054212960

ABSTRACT:
An engine intake apparatus includes a mechanical supercharger: a plurality of engine cylinders, each of the engine cylinders communicating with an intake air passage through an intake valve and an exhaust gas passage through an exhaust valve; and a variable valve timing mechanism for varying a valve overlap period between the intake and exhaust valves. The variable valve timing mechanism widens the valve overlap period in a predetermined high engine speed region and narrows the valve overlap period in predetermined low engine speed region. When the valve overlap is large, an inertia supercharging effect is generated so that a negative-pressure wave caused during an engine intake stroke propagates in the independent intake air passage from the engine cylinder to an upstream part thereof, in turn, is reflected at a volumetrically enlarged portion and, then, becomes a positive-pressure wave and returns to the engine cylinder. On the other hand, when the valve overlap is small, a resonance supercharging effect is generated so that the engine cylinders belonging to the same group are not contiguous with each other in their intake orders for causing a resonance supercharging effect.

REFERENCES:
patent: 4530318 (1985-07-01), Semple
patent: 5125369 (1992-06-01), Hitomi et al.

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