Patent ID: 8042504
Filing Date: 2011-10-25
Classification: F01L,F02D,Y02T

Abstract:
1. A method to operate a four-stroke, internal-combustion engine having first-bank cylinders and second-bank cylinders, a first intake camshaft actuating intake poppet valves coupled to the first-bank cylinders, a first exhaust camshaft actuating exhaust poppet valves coupled to the first-bank cylinders, a second intake camshaft actuating intake poppet valves coupled to the second-bank cylinders, and a second exhaust camshaft actuating exhaust poppet valves coupled to the second-bank cylinders, a first intake camshaft adjuster coupled to the first intake camshaft, and a first exhaust camshaft adjuster coupled to the first exhaust camshaft, the method comprising: commanding the first exhaust camshaft adjuster to adjust the first exhaust camshaft to a position such that a first quantity of gases inducted into the first-bank cylinders from an engine exhaust is at least as much as a second quantity of gases exhausted from the first-bank cylinders into an engine exhaust wherein the commanding of the first exhaust camshaft adjuster causes the first exhaust camshaft to rotate with respect to the first intake camshaft.