Abstract: Systems and methods for controlling operation of dual fuel internal combustion engines in response to a load shedding event are disclosed. The control techniques mitigate the amount of uncombusted gaseous fuel passing into the exhaust and/or aftertreatment system and reduce the rate at which uncombusted gaseous fuel enters the cylinders to reduce engine torque output and/or speed in response to the load shedding event.

Abstract: Systems and methods for controlling intake flow to dual fuel internal combustion engines are disclosed. The system includes an intake system for providing a charge flow to a plurality of cylinders of the engine through at least two asymmetric intake passages connected to respective intake ports of each cylinder of the engine. At least one or both intake passages includes a throttle to control the intake flow therethrough. The characteristics of the charge flow into the cylinders is controlled by the throttles in response to operating conditions of the dual fuel engine.

Abstract: A sheathed electrical resistance heater is provided with a metal corrugated resistance heating element located internally within a surrounding metal sheath and separated from the sheath by a compacted insulating material such as magnesium oxide. The preferred corrugated resistance element is a flat strip of metal that has been corrugated such as by passing the strip through the nip of a pair of gears. The corrugated strip resistance element is thicker than a foil and may be used to provide sheathed, electrical resistance heaters where it is too difficult to wind large diameter wires, which are desired for a low resistance ohm of 0.12 ohm/inch or less, on a small arbor to form a coiled wire resistance element. A heater may be formed with a resistance of 0.05 ohm/inch using the corrugated metal ribbon and may be 200 inches in length and have a finned sheath. Preferably, the sheath is compressed in a die to reduce the cross-sectional area of the heater without a substantial elongation of the sheath.

Abstract: A sheathed electrical resistance heater is provided with a metal corrugated resistance heating element located internally within a surrounding metal sheath and separated from the sheath by a compacted insulating material such as magnesium oxide. The preferred corrugated resistance element is a flat strip of metal that has been corrugated such as by passing the strip through the nip of a pair of gears. The corrugated strip resistance element is thicker than a foil and may be used to provide sheathed, electrical resistance heaters where it is too difficult to wind large diameter wires, which are desired for a low resistance ohm of 0.12 ohm/inch or less, on a small arbor to form a coiled wire resistance element. A heater may be formed with a resistance of 0.05 ohm/inch using the corrugated metal ribbon and may be 200 inches in length and have a finned sheath. Preferably, the sheath is compressed in a die to reduce the cross-sectional area of the heater without a substantial elongation of the sheath.

Abstract: A turbocompound engine having a power turbine bypass valve and a control module for controlling opening and closing of the bypass valve. The turbocompound engine is capable of operating in a compression braking mode, and the control module opens the bypass valve in response to actuation of the compression braking, resulting in improved braking.

Abstract: A bi-directional internal/external gear pump with advanced porting includes inlet and outlet ports symmetrical about a line perpendicular to the port centerline. An internal/external gear set is rotatable on parallel axes establishing the hydraulic centerline, which is advanced relative to the port centerline by some predetermined angle. One axis may be revolved about the other to shift the hydraulic centerline by substantially 180.degree. minus twice the angle of advance.