Abstract: A control system for a power unit having a supply of fuel and a supply of reductant is disclosed. The control system may have a first sensor associated with the supply of fuel to generate a signal indicative of a quantity of fuel remaining. The control system may also have a second sensor associated with the supply of reductant to generate a signal indicative of a quantity of the reductant remaining. The control system may further have a controller in communication with the first and second sensors. The controller may be configured to affect operation of the power unit such that the remaining fuel is consumed before consumption of the remaining reductant.

Abstract: A method for recirculating exhaust gas includes operating an intake valve to open an intake port of a combustion chamber, operating an exhaust valve to open an exhaust port of the combustion chamber, and directing exhaust gas from the exhaust port to an exhaust recirculation port of the combustion chamber. The method also includes operating an exhaust recirculation valve to open the exhaust recirculation port to allow the exhaust gas to enter the combustion chamber and determining at least one valve actuation condition for controlling actuation of each of the intake valve and the exhaust recirculation valve.

Abstract: An engine system for a power unit is disclosed. The engine system includes an exhaust system having at least one exhaust treatment device and an air induction system having at least one heater. The heater is configured to raise the temperature of an intake flow in the air induction system in response to a physical property of the exhaust treatment device.

Abstract: A control system for a power unit having a supply of fuel and a supply of reductant is disclosed. The control system may have a first sensor associated with the supply of fuel to generate a signal indicative of a quantity of fuel remaining. The control system may also have a second sensor associated with the supply of reductant to generate a signal indicative of a quantity of the reductant remaining. The control system may further have a controller in communication with the first and second sensors. The controller may be configured to affect operation of the power unit such that the remaining fuel is consumed before consumption of the remaining reductant.

Abstract: Electronically controlled internal combustion engines are operated based upon control calibration algorithms that can come in a variety of forms, including maps, equations, surfaces and other mathematical techniques. Each combination of a control calibration algorithm and a particular engine must satisfy certain constraints such as customer acceptance and value demands, and should have the ability to perform a variety of expected duty cycles for the given engine application. A plurality of different engine control calibration algorithms are made available to an engine control system. Each of the engine calibration algorithms corresponds to a particular duty cycle while being optimized for a performance parameter such as reduced emissions, while meeting a variety of constraints.

Abstract: Electronically controlled internal combustion engines are operated based upon control calibration algorithms that can come in a variety of forms, including maps, equations, surfaces and other mathematical techniques. Each combination of a control calibration algorithm and a particular engine must satisfy certain constraints such as customer acceptance and value demands, and should have the ability to perform a variety of expected duty cycles for the given engine application. A plurality of different engine control calibration algorithms are made available to an engine control system. Each of the engine calibration algorithms corresponds to a particular duty cycle while being optimized for a performance parameter such as reduced emissions, while meeting a variety of constraints.

Abstract: The present invention finds application in engines using mechanically actuated electronically controlled fuel injectors having direct control needle valves. In valves such as these, a spill control valve member controls fuel pressurization within the injector while a needle control valve member controls the timing and duration of the injection event. However, when the momentum of fuel exiting the fuel injector past the spill valve is greater than that of the tappet and plunger moving toward their downward positions, engine components upstream of the tappet can briefly separate and re-engage, which can result in increased mechanical noise levels. Therefore, the present invention is directed to maintaining sufficient contact force in the various engine components to reduce the mechanical noise levels by positioning a flow restriction between the fuel pressurization chamber of the fuel injector and a fuel source.

Abstract: The present invention finds application in engines using mechanically actuated electronically controlled fuel injectors having direct control needle valves. In valves such as these, a spill control valve member controls fuel pressurization within the injector while a needle control valve member controls the timing and duration of the injection event. However, when the momentum of fuel exiting the fuel injector past the spill valve is greater than that of the tappet and plunger moving toward their downward positions, engine components upstream of the tappet can briefly separate and re-engage, which can result in increased mechanical noise levels. Therefore, the present invention is directed to maintaining sufficient contact force in the various engine components to reduce the mechanical noise levels by positioning a flow restriction between the fuel pressurization chamber of the fuel injector and a fuel source.

Abstract: Past exhaust emission control systems have required additional add on or hang on components. The present exhaust emission recirculation system reduces the emissions emitted from an engine. The present exhaust emission recirculation system is comprised of a head being attached to a block having of a cylinder therein. The head has an intake passage therein and an intake valve interposed the intake passage and the cylinder. The head has a recirculation passage therein having an exhaust gas recirculation valve interposed the intake passage and the cylinder. And, the exhaust gas recirculation valve is movable between a closed position and an open position in which an exhaust gas is communicated from the cylinder to the intake passage.

Abstract: A speed-governed lean burn engine and its fuel and air delivery apparatus are provided with a control system that monitors engine conditions, including actual speed relative to a desired speed setting, to determine which of two air to fuel ratios the engine operates with under the existing conditions: either a stoichiometric ratio or a lean-burn ratio. A stoichiometric ratio is to provide short periods of smooth and rapid response to an increased load during which NOx emissions are reduced by a three-way catalyst in the exhaust from the engine. The lean-burn ratio during other periods of operation is sufficiently lean to exhibit low NOx emissions and allows operation with low fuel consumption. The invention can be applied to improve performance of gas fueled truck engines, for example.