초록 ▼

A method of engine compression braking for an internal combustion engine is disclosed wherein the engine is converted to a two-cycle mode for braking. Exhaust valves are opened in cylinders wherein associated pistons are near top dead center and substantially simultaneously, exhaust valves are opene

A method of engine compression braking for an internal combustion engine is disclosed wherein the engine is converted to a two-cycle mode for braking. Exhaust valves are opened in cylinders wherein associated pistons are near top dead center and substantially simultaneously, exhaust valves are opened in cylinders wherein associated pistons are nominally past bottom dead center. The method results in an advantageous braking power increase due to back-filling of the cylinders wherein the pistons are nominally past bottom dead center. A similar method is disclosed for use during four-cycle braking.

대표청구항 ▼

[ We claim:] [1.] A method of compression braking of an internal combustion engine having three or more combustion chambers, each combustion chamber being in flow communication with an exhaust valve movable between an open position and a closed position for selectively placing three or more combusti

[ We claim:] [1.] A method of compression braking of an internal combustion engine having three or more combustion chambers, each combustion chamber being in flow communication with an exhaust valve movable between an open position and a closed position for selectively placing three or more combustion chambers in flow communication with a common exhaust manifold having an average pressure therein, the method comprising the steps of:opening a first exhaust valve in flow communication with a first combustion chamber at a time corresponding to an elevated pressure condition in the first combustion chamber relative to the average pressure;opening a second exhaust valve in flow communication with a second combustion chamber substantially simultaneously with the opening of the first exhaust valve and at a time corresponding to a lower but increasing pressure condition in the second combustion chamber relative to the average pressure; andmaintaining at least a third exhaust valve, in flow communication with a third combustion chamber, in the closed position throughout a period of time during which either of the first exhaust valve or the second exhaust valve is in the open position.