Abstract: Methods and systems are provided for estimating exhaust gas recirculation (EGR) flow in an engine including an EGR system. In one example, a method may include operating the EGR system in an open loop feed forward mode based on an intake carbon di oxide sensor output above a threshold engine load and/or when a manifold absolute pressure (MAP) is above a threshold pressure, and operating the EGR system in a closed loop feedback mode based on a differential pressure sensor output when the engine load decreases below the threshold load and/or when the MAP decreases below the threshold pressure.

Abstract: Methods and systems are provided for increasing airflow through a charge air cooler (CAC) in order to purge condensate from the CAC. In one example, a method includes increasing airflow through the CAC while maintaining torque by selectively deactivating one or more engine cylinders and increasing boost. The number of deactivated cylinders may be based on an amount of condensate within the CAC.

Abstract: Methods and systems for simultaneously operating port fuel injectors and direct fuel injectors of an internal combustion engine are described. In one example, operation of a port fuel injector is deactivated in response to an indication of reduced performance of a direct fuel injector so that degradation of the direct fuel injector may be reduced.

Abstract: Methods and systems are provided for estimating exhaust gas recirculation (EGR) flow in an engine including an EGR system. In one example, a method may include operating the EGR system in an open loop feed forward mode based on an intake carbon di oxide sensor output above a threshold engine load and/or when a manifold absolute pressure (MAP) is above a threshold pressure, and operating the EGR system in a closed loop feedback mode based on a differential pressure sensor output when the engine load decreases below the threshold load and/or when the MAP decreases below the threshold pressure.

Abstract: Methods and systems are provided for estimating exhaust gas recirculation (EGR) flow in an engine including an EGR system. In one example, a method may include operating the EGR system in an open loop feed forward mode based on an intake carbon di oxide sensor output above a threshold engine load and/or when a manifold absolute pressure (MAP) is above a threshold pressure, and operating the EGR system in a closed loop feedback mode based on a differential pressure sensor output when the engine load decreases below the threshold load and/or when the MAP decreases below the threshold pressure.

Abstract: Methods and systems are provided for estimating exhaust gas recirculation (EGR) flow in an engine including an EGR system. In one example, a method may include operating the EGR system in an open loop feed forward mode based on an intake carbon di oxide sensor output above a threshold engine load and/or when a manifold absolute pressure (MAP) is above a threshold pressure, and operating the EGR system in a closed loop feedback mode based on a differential pressure sensor output when the engine load decreases below the threshold load and/or when the MAP decreases below the threshold pressure.

Abstract: A system and method for controlling a multiple cylinder internal combustion engine having an exhaust gas turbocharger with a compressor coupled to a turbine include redirecting substantially all intake airflow around the compressor and substantially all exhaust flow around the turbine when an engine operating parameter exceeds an associated threshold. In one embodiment, turbocharger boost is provided below an associated engine speed threshold with the turbocharger compressor and turbine bypassed at higher engine speeds such that the engine operates as a naturally aspirated engine.

Abstract: Methods and systems are provided for mitigating excessive exhaust pressures in an engine. In one example, a method may include adjusting an intake throttle responsive to exhaust pressure upstream of an exhaust turbine being higher than a threshold without reducing boost level. In this way, boost pressures may be maintained while reducing exhaust pressures.

Abstract: Methods and systems are provided for reducing hot fuel vapor formation in a port injection fuel rail. In one example, a method may include operating a dual fuel injection system with at least a calibrated minimum amount of port fuel injection over a wide range of engine operating conditions, even as conditions change. A direct fuel injection amount is adjusted in accordance.

Abstract: Methods and systems for simultaneously operating port fuel injectors and direct fuel injectors of an internal combustion engine are described. In one example, operation of a port fuel injector is deactivated in response to an indication of reduced performance of a direct fuel injector so that degradation of the direct fuel injector may be reduced.

Abstract: Methods and systems for simultaneously operating port fuel injectors and direct fuel injectors of an internal combustion engine are described. In one example, operation of all of an engine's port fuel injectors may be adjusted in response to degradation of a sole port fuel injector so that an engine may operate as desired with a plurality of direct fuel injectors.

Abstract: Methods and systems for simultaneously operating port fuel injectors and direct fuel injectors of an internal combustion engine are described. In one example, port fuel injection timing is adjusted to reduce particulate matter formation in the engine so that particulate filter loading may be reduced until a time when the particulate filter may be purged.

Abstract: Embodiments for generating vacuum at a throttle are presented. In one example, a system comprises a throttle positioned in an intake of an engine, and a peripheral venturi proximate the throttle, the venturi having an inlet positioned to interface with an edge of the throttle when the throttle is in a partially open position. In this way, vacuum may be generated by flow air through the venturi.

Abstract: Methods and systems are provided for increasing airflow through a charge air cooler (CAC) in order to purge condensate from the CAC. In one example, a method includes increasing airflow through the CAC while maintaining torque by selectively deactivating one or more engine cylinders and increasing boost. The number of deactivated cylinders may be based on an amount of condensate within the CAC.

Abstract: Methods and systems are provided for increasing airflow through a charge air cooler (CAC) in order to purge condensate from the CAC. In one example, a method includes increasing airflow through the CAC while maintaining torque by selectively deactivating one or more engine cylinders and increasing boost. The number of deactivated cylinders may be based on an amount of condensate within the CAC.

Abstract: Methods and systems are provided for increasing airflow through a charge air cooler (CAC) in order to purge condensate from the CAC. In one example, a method includes increasing airflow through the CAC while maintaining torque by one or more of selectively deactivating one or more engine cylinders and increasing boost or opening a compressor bypass valve and increasing boost. The amount of compressor bypass valve opening and number of deactivated cylinders may be based on an amount of condensate within the CAC.

Abstract: A turbocharger system is provided. The turbocharger system may include a first turbocharger including a first turbine in fluidic communication with a first cylinder, a second turbocharger including a second turbine in fluidic communication with a second cylinder, and a shared bypass conduit having a wastegate coupled thereto, the shared bypass conduit is in fluidic communication with an inlet of the first turbine and an inlet of the second turbine.

Abstract: Embodiments for generating vacuum at a throttle are presented. In one example, a system comprises a throttle positioned in an intake of an engine, and a peripheral venturi proximate the throttle, the venturi having an inlet positioned to interface with an edge of the throttle when the throttle is in a partially open position. In this way, vacuum may be generated by flow air through the venturi.

Abstract: A turbocharger system is provided. The turbocharger system may include a first turbocharger including a first turbine in fluidic communication with a first cylinder, a second turbocharger including a second turbine in fluidic communication with a second cylinder, and a shared bypass conduit having a wastegate coupled thereto, the shared bypass conduit is in fluidic communication with an inlet of the first turbine and an inlet of the second turbine.

Abstract: A method of forming a bowl in a top surface of a piston for an internal combustion engine includes machining the top surface of the piston to form a spherical depression in the top surface wherein the top surface comprises a dome prior to the machining and a center of the bowl is displaced from a center of the piston by at least one-quarter of a diameter of the piston. In one embodiment, the method includes machining recesses in the top surface aligned, respectively, with intake valves, an exhaust valve, and spark plug when installed. Because the bowl is smooth and shallow, the surface area of the combustion chamber is less than with a deeper bowl of complicated shape. Lowering surface area in the combustion chamber leads to improved fuel economy.