Abstract: A method of operating an IC engine in an agricultural harvester includes the steps of: operating the IC engine in a normal mode with a base torque curve as a function of engine operating speed and engine power output, the base torque curve being generally isochronous at a rated operating speed over a power output range terminating at a rated power output; and operating the IC engine in a boost mode with a boost torque curve when a power boost is required above the rated power output, the boost torque curve having a power output which is above the base torque curve over a predefined range of the operating speed.

Abstract: A method of operating an internal combustion engine including the steps of detecting, determining, and switching. The detecting step detects a load on the engine. The determining step determines if the load is below a predetermined value. The switching step switches the engine to operate at a selected one of a plurality of torque power curves, dependent upon the determining step.

Abstract: A method of operating an IC engine in an agricultural harvester includes the steps of: operating the IC engine in a normal mode with a base torque curve as a function of engine operating speed and engine power output, the base torque curve being generally isochronous at a rated operating speed over a power output range terminating at a rated power output; and operating the IC engine in a boost mode with a boost torque curve when a power boost is required above the rated power output, the boost torque curve having a power output which is above the base torque curve over a predefined range of the operating speed.

Abstract: A diffuser for a work machine having an air breathing fuel consuming internal combustion engine with an exhaust aftertreatment device periodically elevating the exhaust temperatures to a high level. The diffuser has a venturi section and the excess contaminants from an intake air pre-cleaner are directed to the throat of the venturi to aspirate and dispose of excess contaminants while cooling the exhaust flow. Additional openings in the divergent section of the diffuser assist in providing significant reductions in exhaust temperatures within a short axial envelope.

Abstract: A method of operating an internal combustion engine including the steps of detecting, determining, and switching. The detecting step detects a load on the engine. The determining step determines if the load is below a predetermined value. The switching step switches the engine to operate at a selected one of a plurality of torque power curves, dependent upon the determining step.

Abstract: A diffuser for a work machine having an air breathing fuel consuming internal combustion engine with an exhaust aftertreatment device periodically elevating the exhaust temperatures to a high level. The diffuser has a venturi section and the excess contaminants from an intake air pre-cleaner are directed to the throat of the venturi to aspirate and dispose of excess contaminants while cooling the exhaust flow. Additional openings in the divergent section of the diffuser assist in providing significant reductions in exhaust temperatures within a short axial envelope.