Abstract: Techniques for learning endstop position(s) of an actuator for a wastegate valve include detecting a learn condition and, in response to detecting the learn condition, performing a learn procedure for the actuator endstop position(s). The learn procedure includes commanding the actuator to a desired position past the endstop position corresponding to a fully-closed wastegate valve while rate-limiting a velocity of the actuator. When the difference reaches its maximum allowed value and the velocity falls below a fraction of its rate limit, the endstop position is learned. When the wastegate valve is requested open, the actuator is then controlled using the learned endstop position. Reference stiffness for a fully-closed wastegate valve could be obtained, and subsequent stiffness checks could then be periodically performed and, if less than the reference stiffness, a duty cycle of the actuator could be increased during open-loop control.

Abstract: A system and method for controlling condensation formation in an engine having EGR and forced induction includes a controller for determining a water vapor mass fraction of an exhaust stream based on a water vapor mass fraction of an intake stream and water vapor from combustion. An estimated condensation temperature (CT) is determined for a current EGR level based on the water vapor mass fractions and is compared to an intake stream temperature upstream of the compressor inlet. The controller commands the current EGR level as a maximum EGR level upon determining the intake stream temperature is less than the CT, and an increase in the current EGR level upon determining the intake stream temperature is greater than the CT. An air charge temperature (ACT) of the forced induction system may be controlled based on utilizing a target ACT as the CT to be controlled by a coolant pump.

Abstract: A technique is provided for compensating an untrimmed oxygen (O2) sensor utilized in operation of an exhaust gas recalculation (EGR) system associated with an engine. The technique includes, in one implementation, receiving a measurement from the O2 sensor at a known pressure, where the O2 sensor is positioned on an intake side of an engine system. Humidity compensation and pressure compensation are then determined for the O2 sensor measurement, where the pressure compensation is based in part on the humidity compensation. The EGR system is controlled using the untrimmed O2 sensor measurement that has been compensated for pressure and humidity.

Abstract: A control technique for an engine having a two-step variable valve lift system includes a controller receiving a pressure in an intake manifold of the engine from a manifold absolute pressure (MAP) sensor and a position of an EGR valve of the engine from an exhaust gas recirculation (EGR) sensor. In response to the controller detecting an upcoming HL-to-LL valve state transition, a set of airflow actuators of the engine is controlled, based on the intake manifold pressure and the EGR valve position, to generate a first torque reserve. In response to generating the first torque reserve, the controller then commands the HL-to-LL transition and depletion of the first torque reserve during the HL-to-LL transition to mitigate torque disturbance associated with this transition.

Abstract: A boost purge ejector tee arrangement is integrated into a turbocompressor associated with an engine and includes first and second passages, an inlet port and a nozzle. The first passage is formed into a housing of the turbocompressor and includes an outlet in communication with a turbocompressor inlet. The second passage is formed into the housing and includes a boost air inlet in communication with an internal outlet area of the turbocompressor and intersecting the first passage. The inlet port is associated with the housing and intersects the first passage. The nozzle is positioned in the first passage such that an outlet of the nozzle is proximate the intersection of the inlet port and first passage. During a boost mode of operation, the second passage is adapted to receive boost air flow, which flows through the nozzle thereby creating a vacuum and drawing purge through the inlet port.

Abstract: A control technique for an engine having a two-step variable valve lift system includes a controller receiving a pressure in an intake manifold of the engine from a manifold absolute pressure (MAP) sensor and a position of an EGR valve of the engine from an exhaust gas recirculation (EGR) sensor. In response to the controller detecting an upcoming HL-to-LL valve state transition, a set of airflow actuators of the engine is controlled, based on the intake manifold pressure and the EGR valve position, to generate a first torque reserve. In response to generating the first torque reserve, the controller then commands the HL-to-LL transition and depletion of the first torque reserve during the HL-to-LL transition to mitigate torque disturbance associated with this transition.

Abstract: Techniques for learning endstop position(s) of an actuator for a wastegate valve include detecting a learn condition and, in response to detecting the learn condition, performing a learn procedure for the actuator endstop position(s). The learn procedure includes commanding the actuator to a desired position past the endstop position corresponding to a fully-closed wastegate valve while rate-limiting a velocity of the actuator. When the difference reaches its maximum allowed value and the velocity falls below a fraction of its rate limit, the endstop position is learned. When the wastegate valve is requested open, the actuator is then controlled using the learned endstop position. Reference stiffness for a fully-closed wastegate valve could be obtained, and subsequent stiffness checks could then be periodically performed and, if less than the reference stiffness, a duty cycle of the actuator could be increased during open-loop control.

Abstract: A control system for an engine includes first and second modules. The first module estimates a total amount of exhaust gas recirculation (EGR) in the engine, wherein the total amount of EGR includes (i) EGR within cylinders of the engine and (ii) EGR flowing through an EGR system of the engine. The second module selectively controls an overlap of intake and exhaust valve timing in the engine based on (i) a position of an EGR valve in the EGR system and (ii) a comparison of the estimated total amount of EGR in the engine and an EGR threshold.

Abstract: A technique is provided for compensating an untrimmed oxygen (O2) sensor utilized in operation of an exhaust gas recalculation (EGR) system associated with an engine. The technique includes, in one implementation, receiving a measurement from the O2 sensor at a known pressure, where the O2 sensor is positioned on an intake side of an engine system. Humidity compensation and pressure compensation are then determined for the O2 sensor measurement, where the pressure compensation is based in part on the humidity compensation. The EGR system is controlled using the untrimmed O2 sensor measurement that has been compensated for pressure and humidity.

Abstract: A boost purge ejector tee arrangement is integrated into a turbocompressor associated with an engine and includes first and second passages, an inlet port and a nozzle. The first passage is formed into a housing of the turbocompressor and includes an outlet in communication with a turbocompressor inlet. The second passage is formed into the housing and includes a boost air inlet in communication with an internal outlet area of the turbocompressor and intersecting the first passage. The inlet port is associated with the housing and intersects the first passage. The nozzle is positioned in the first passage such that an outlet of the nozzle is proximate the intersection of the inlet port and first passage. During a boost mode of operation, the second passage is adapted to receive boost air flow, which flows through the nozzle thereby creating a vacuum and drawing purge through the inlet port.

Abstract: A waste heat recovery system that efficiently converts waste heat from an engine coolant and an engine exhaust in a vehicle. The system includes a coolant heat exchanger that receives heat from the engine coolant, an exhaust heat exchanger that receives heat from the engine exhaust and an economizer heat exchanger. A plurality of valves control the flow of the fluid in different modes as determined by a power ratio between the heat provided by the exhaust heat exchanger and the heat provided by the coolant heat exchanger, including an economizer heat exchanger after coolant heat exchanger mode at low power ratios, where the fluid from the pump flows to the economizer heat exchanger after the coolant heat exchanger and an economizer heat exchanger before coolant heat exchanger mode at high power ratios, where the fluid from the pump flows to the economizer heat exchanger before the coolant heat exchanger.

Abstract: A system and method of operating a waste heat recovery system for a vehicle is provided. The system includes an expander/compressor portion mechanically linked to wheels of the vehicle, the expander/compressor portion including an inlet valve and an exhaust valve. A combustion engine is provided having an exhaust portion. A working fluid path is thermally coupled between the combustion engine and a working fluid, the working fluid path being fluidly coupled to the expander/compressor portion. A boiler portion is fluidly coupled to the working fluid path, the boiler portion further being thermally coupled to the exhaust portion. An accumulator tank portion having a cavity is operative to receive and store the working fluid, the accumulator tank portion fluidly coupled to the inlet valve and the exhaust valve. A condenser is fluidly coupled to the working fluid path and the exhaust valve.

Abstract: An exhaust gas treatment device is disposed in an exhaust gas treatment system and comprises a rolled metal cylinder of corrugated metal sheet having longitudinally extending passages extending axially from an inlet end to an outlet end and a conduit disposed between layers of the rolled metal cylinder and configured for circulation of a heat transfer medium therethrough, the conduit extending axially and radially the rolled metal cylinder.

Abstract: A vehicle waste heat recovery system may include a first pump, an internal combustion engine, a waste heat recovery device and a condenser. The first pump may be in fluid communication with a fluid. The internal combustion engine may be operable to power rotation of a drive axle of a vehicle and may define an engine coolant passage having an inlet in fluid communication with an outlet of the first pump. The waste heat recovery device may have an inlet in fluid communication with an outlet of the engine coolant passage. The condenser may have an inlet in fluid communication with an outlet of the waste heat recovery device and an outlet in fluid communication with an inlet of the first pump.

Abstract: In one exemplary embodiment of an exhaust system, the system includes an exhaust manifold in fluid communication with an internal combustion engine and a forced induction device in fluid communication with the exhaust manifold, the forced induction device including a housing. The system further includes a flow control device to control fluid communication between the forced induction device and a catalyst substrate and to control fluid communication between the exhaust manifold and the catalyst substrate.

Abstract: A waste heat recovery system that efficiently converts waste heat from an engine coolant and an engine exhaust in a vehicle. The system includes a coolant heat exchanger that receives heat from the engine coolant, an exhaust heat exchanger that receives heat from the engine exhaust and an economizer heat exchanger. A plurality of valves control the flow of the fluid in different modes as determined by a power ratio between the heat provided by the exhaust heat exchanger and the heat provided by the coolant heat exchanger, including an economizer heat exchanger after coolant heat exchanger mode at low power ratios, where the fluid from the pump flows to the economizer heat exchanger after the coolant heat exchanger and an economizer heat exchanger before coolant heat exchanger mode at high power ratios, where the fluid from the pump flows to the economizer heat exchanger before the coolant heat exchanger.

Abstract: A control system for an engine includes first and second modules. The first module estimates a total amount of exhaust gas recirculation (EGR) in the engine, wherein the total amount of EGR includes (i) EGR within cylinders of the engine and (ii) EGR flowing through an EGR system of the engine. The second module selectively controls an overlap of intake and exhaust valve timing in the engine based on (i) a position of an EGR valve in the EGR system and (ii) a comparison of the estimated total amount of EGR in the engine and an EGR threshold.

Abstract: In one exemplary embodiment of an exhaust system, the system includes an exhaust manifold in fluid communication with an internal combustion engine and a forced induction device in fluid communication with the exhaust manifold, the forced induction device including a housing. The system further includes a flow control device to control fluid communication between the forced induction device and a catalyst substrate and to control fluid communication between the exhaust manifold and the catalyst substrate.

Abstract: A fluid flow valve in a cylinder head comprises a first valve end and an axially disposed second shaft end connected by a valve shaft. A first valve member is located at the first valve end and a second valve member is located axially from, and in fixed relationship to, the first valve member along the valve shaft. A valve support extends axially between and connects the first valve member and the second valve member; the valve support including an axially extending wall portion having circumferentially spaced support struts extending radially between the valve shaft and the wall portion. Fluid flow passages extend axially through the wall portion, between the circumferentially spaced support struts, wherein fluid flows simultaneously about the exterior of the wall portion and through the fluid flow passages in the wall portion when the valve member is biased to an open position.

Abstract: A HVAC-APU system is provided for a battery electric vehicle. The system includes, but is not limited to a refrigerant fluid. A power cycle loop section, a cabin heating cycle loop section, and a cabin refrigeration cycle loop section are in selective fluid communication with each other to advance the refrigerant fluid through the system. A compressor-expander train includes, but is not limited to a reversing compressor-expander and a high-pressure pump that are operably connected by a shaft. The high-pressure pump pressurizes the refrigerant fluid to form a high-pressure refrigerant fluid. An auxiliary fuel cell and combustion unit heats a heat transfer fluid. A heat exchanger transfers heat from the heated transfer fluid to the high-pressure refrigerant fluid to form a heated high-pressure refrigerant fluid. The reversing compressor-expander expands the heated high-pressure refrigerant fluid to rotate the shaft in a first direction to drive the high-pressure pump.