Patent ID: 7357103

Claim:
An automotive system, comprising: an internal combustion engine, comprising: at least one cylinder; a piston whose compression action causes a mixture of air and fuel within a combustion chamber of said cylinder to be ignited; at least one inlet valve for admitting gas which includes fresh air into said cylinder; at least one exhaust valve for exhausting combusted gases from said cylinder; a fuel injection system having at least one fuel injector, through which fuel is injected into said combustion chamber of said cylinder; an intake air charging system for supplying air under pressure to an engine air intake manifold; at least one sensor for measuring an engine operating parameter; and a controller operating said engine in a first combustion mode, said controller subsequently switching engine operation to a second combustion mode wherein manifold pressure in said second combustion mode is lower than manifold pressure in said first combustion mode; and controlling said intake air charging system to cause a temporary airflow reversal thereby equalizing a pressure difference between said intake valve and said exhaust valve.