초록 ▼

A reciprocating internal combustion engine has a pilot mask situated about the intake valve seat and extending into the engine cylinder and a variable camshaft timing drive system which positions the camshaft such that the lift of the intake valve and the height of the pilot mask are approximately e

A reciprocating internal combustion engine has a pilot mask situated about the intake valve seat and extending into the engine cylinder and a variable camshaft timing drive system which positions the camshaft such that the lift of the intake valve and the height of the pilot mask are approximately equal when the piston is moving at the point of its greatest velocity during the intake stroke.

대표청구항 ▼

[ What is claimed is:] [1.] A reciprocating four-stroke cycle internal combustion engine having a cylinder block with at least one cylinder, a piston, a crankshaft, a connecting rod joining the piston and the crankshaft, an intake manifold, and intake and exhaust poppet valves servicing the cylinder

[ What is claimed is:] [1.] A reciprocating four-stroke cycle internal combustion engine having a cylinder block with at least one cylinder, a piston, a crankshaft, a connecting rod joining the piston and the crankshaft, an intake manifold, and intake and exhaust poppet valves servicing the cylinder, with said engine further comprising:a cylinder head mounted upon the cylinder block so as to close the cylinder, with the cylinder block having at least one intake port having a valve seat for the intake valve;a pilot mask integral with the cylinder head and situated about the valve seat and extending into the cylinder;a camshaft for actuating at least said intake valve;a camshaft drive for rotating the camshaft and for adjusting the rotational timing of the camshaft with respect to the crankshaft, with the camshaft having a base timing; anda controller for operating the camshaft drive so as to position the camshaft such that the lift of the intake valve and the height of the pilot mask are approximately equal when the piston is moving at the point of its greatest velocity during the intake stroke.