Abstract: A system for controlling boost pressure at various different altitudes of operation of a turbo charged internal combustion engine includes a wastegate valve, an actuator, and a controller. Signals delivered from an engine speed sensor, a boost pressure transducer, a barometric pressure sensor, and a turbocharger speed sensor are processed in the controller. A control signal delivered from the controller to the actuator controls the position of the wastegate valve, bypass of exhaust gasses, and the speed of the turbocharger. The controller is configured to compare the turbocharger speed to a predetermined threshold value and determine the control signal based on the comparison.

Abstract: A method of controlling an engine during an engine startup or shutdown condition includes operating a valve to open a port of a combustion chamber to allow fluid to flow between the combustion chamber and the port for at least one entire engine cycle. The method also includes preventing combustion of fuel during a combustion stroke of the at least one engine cycle. The engine cycle occurs during the engine startup or shutdown condition.

Abstract: A turbocharger for an engine is provided. The turbocharger has a turbine and a housing enclosing the turbine. The housing has a first annular passageway and a second annular passageway. Both of the first and second annular passageways extend to the turbine. The turbocharger also has a valve mechanism disposed within an inlet of the housing. The valve mechanism has a valve element pivotally attached to a portion of the housing. The valve element is movable between a first position at which exhaust flow through the first annular passageway is blocked and a second position at which exhaust flows through both of the first and second annular passageways. A controller controls positioning of the valve element based on a sensed operational parameter of the engine and also controls functions of the engine.

Abstract: A method for altering an operating condition of a filter includes actively increasing the temperature of the filter to a desired temperature below a regeneration temperature and sensing a filter operating condition at about the desired temperature. The method also includes comparing the sensed filter operating condition to an expected filter operating condition range and actively increasing the temperature of the filter to the regeneration temperature in response to the comparison.

Abstract: A particulate trap regeneration system is provided. The system may include a particulate trap configured to remove one or more types of particulate matter from an exhaust flow of an engine. The system may also include a regeneration device configured to reduce an amount of particulate matter in the particulate trap. The system may further include a controller configured to activate the regeneration device in response to the first to occur of at least three trigger conditions.

Abstract: A turbocharger for a power system is provided. The turbocharger has a turbine and a housing enclosing the turbine. The housing has a first annular passageway and a second annular passageway. Both of the first and second annular passageways extend from an inlet of the housing to the turbine. The turbocharger also has a valve mechanism disposed within the inlet of the housing. The valve mechanism has a valve element pivotally attached to an outer portion of the housing. The valve element is movable between a first position at which exhaust flow through the first annular passageway is blocked and a second position at which exhaust flows through both of the first and second annular passageways.

Abstract: A method of controlling an engine having a valve actuation system is provided. The engine is started. A first parameter indicative of a first temperature of the engine is sensed. A second parameter indicative of a second temperature of the engine is sensed. The valve actuation system is disabled to prevent the implementation of a variation on conventional engine valve actuation timing in response to each of the first and second temperatures being below a predetermined value.

Abstract: Having the ability to quickly and easily test whether a variable valve mechanism is operating properly can avoid unnecessary down time and the expense associated with potentially replacing a good component on an internal combustion engine. A test can include inducing a misfire in a cylinder of the engine at least in part by commanding a change to a state of a variable valve mechanism at a predetermined timing. For instance, in the case of a diesel engine, a variable valve mechanism can be tested by closing an intake valve late so as to reduce a cylinder compression ratio to a point that autoignition of fuel does not occur, resulting in a misfire. If a misfire is detected, either audibly by a person or possibly electronically via a sensor, then proper activation of the variable valve mechanism is confirmed.

Abstract: A method of controlling an engine having a valve actuation system is provided. The engine is started. A first parameter indicative of a first temperature of the engine is sensed. A second parameter indicative of a second temperature of the engine is sensed. The valve actuation system is disabled to prevent the implementation of a variation on conventional engine valve actuation timing in response to each of the first and second temperatures being below a predetermined value.