Flow control device for gases through engine cylinder head - uses gas ducts in walls of manifold to reduce swirl effects and increase flow-rates

摘要

The cylinder has the inlet manifold (12) and the exhaust manifold (19) meeting in a gas transfer section (4) bounded by the inlet and outlet valves set at angles. Swirl effects at the manifold edges, generated by tight contours and by the valve guides, are reduced by gas compensation ducts (10, 13, 16, 17) linked to a variable gas control. Gas is either taken from the swirl areas, exhaust gases recycled, air pumped into the swirl areas or a combination of the options are applied to optimise the gas flow through the manifolds. The air pressure is generated by an air pump (35) and the suction by a venturi pump (41). Two multi-way control valves (31, 33) and a processor control (40) regulate the compensation. ADVANTAGE - Improved gas flow, improved exhaust emission control.