Internal-combustion engines – Charge forming device – Supercharger
Patent
1993-09-22
1995-06-27
Koczo, Michael
Internal-combustion engines
Charge forming device
Supercharger
123 9015, 12318453, F02B 3336, F02B 2700, F01L 1344
Patent
active
054270782
ABSTRACT:
A supercharging apparatus for an internal combustion engine comprises an intake air passage communicating with a cylinder of an engine through an intake valve; a mechanical supercharger provided in the intake air passage; a variable valve timing mechanism for varying a closing timing of the intake valve with respect to a bottom dead center of an engine piston; a control unit for controlling the variable valve timing mechanism in accordance with an engine speed at least in a supercharging region wherein the mechanical supercharger is operative to supply supercharged air into the cylinder, in such a manner that the closing timing of the intake valve is switched between an advanced timing and a delayed timing; and an assist intake system for causing a dynamic supercharging effect in the intake air passage when the closing timing of the intake valve is switched to the delayed timing, thereby assisting the mechanical supercharger in a low engine operational region.
REFERENCES:
patent: 4958606 (1990-09-01), Hitomi et al.
patent: 5033268 (1991-07-01), Hitomi et al.
patent: 5090202 (1992-02-01), Hitomi et al.
patent: 5138839 (1992-08-01), Hitomi et al.
Hitomi Mitsuo
Sasaki Junsou
Koczo Michael
Mazda Motor Corporation
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