Abstract: The disclosure describes an internal combustion engine and a method for operating an internal combustion engine, in which an electronic controller is programmed to determine whether the internal combustion engine is operating within a cylinder cutout enabling region and, when the engine operates in the cylinder cutout enabling region, to cutout one or more of the engine cylinders by causing the cutout cylinder's fuel injector to cease injecting fuel into cutout cylinder, and to also cause the still-active engine cylinders to operate with an additional amount of fuel such that a steady state engine torque output remains unchanged before and after the second cylinder is cutout.

Abstract: The disclosure describes an internal combustion engine and a method for operating an internal combustion engine, in which an electronic controller is programmed to determine whether the internal combustion engine is operating within a cylinder cutout enabling region and, when the engine operates in the cylinder cutout enabling region, to cutout one or more of the engine cylinders by causing the cutout cylinder's fuel injector to cease injecting fuel into cutout cylinder, and to also cause the still-active engine cylinders to operate with an additional amount of fuel such that a steady state engine torque output remains unchanged before and after the second cylinder is cutout.

Abstract: An exhaust gas recirculation (EGR) system is provided. The EGR system includes an engine having an intake manifold. The intake manifold is adapted to receive intake air from an aftercooler. The EGR system also includes an exhaust manifold. The exhaust manifold is adapted to receive exhaust gas from a plurality of cylinders of the engine. The EGR system further includes an EGR line. The EGR line is fluidly coupled between the intake manifold and the exhaust manifold. The EGR system includes an EGR valve disposed in the EGR line. The EGR system also includes a pressure line. The pressure line is coupled between the intake manifold and the EGR valve. The EGR valve is movable to an open position from a closed position, based on an intake pressure communicated to the EGR valve via the pressure line.

Abstract: A method to control an injection pressure level of fuel within a unit injector is provided. The method includes provision of a second spill valve in the unit injector, which is connected in parallel to a first spill valve. The fuel is delivered to the unit injector with the first spill valve maintained in a passive state. This facilitates return of the first portion of the fuel to the low-pressure fuel manifold. The first spill valve is actuated to an active state to block the flow of fuel to the low-pressure fuel manifold, to maintain the unit injector at the injection pressure level. The second spill valve is actuated concurrently or prior to the actuation of the first spill valve. This facilitates return of a second portion of the fuel to the low-pressure fuel manifold. This is done to limit the injection pressure level within the unit injector.