Method and system for controlling intake flow between direct and

Details Method and system for controlling intake flow between direct and Method and system for controlling intake flow between direct and

1983-06-14

1985-07-09

Lazarus, Ira S.

Internal-combustion engines

Valve

Valve head cooperates with manifold

123308, F02F 142

Patent

active

045275190

ABSTRACT:
A method for controlling intake flow of an internal combustion engine having an intake port including a helical passage and a straight passage both extending towards a common port end opening which opens to the combustion chamber of the engine, in such a manner that a minimum proportion of intake flow is directed through the straight passage during idling operation of the engine regardless of the temperature condition of the engine, a maximum proportion of intake flow is directed through the straight passage during loaded operation at any non idling load of the engine when the engine is not warmed up, and a proportion of intake flow increasing according to the level of engine load is directed through the straight passage during loaded operation of the engine when the engine has been warmed up. This method is performed by an intake passage switchover control valve system operated conveniently by utilizing intake vacuum under a proper switchover thereof which itself incorporates the engine load performance.

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