Abstract: Methods and systems for increasing exhaust gas temperatures of an engine are described. In one example, engine exhaust gas temperatures may be increased via deactivating cylinders and flowing exhaust gases through deactivated cylinder. Engine pumping losses may be reduced via the exhaust gases that flow through the deactivated cylinder so as to reduce engine fuel consumption while heating an exhaust gas after treatment device.

Abstract: An exhaust gas recirculation system for an engine includes a first conduit, a second conduit, and a mixer. The first conduit is configured to direct a first portion of exhaust gas away from a first exhaust manifold. The second conduit is configured to direct a second portion of exhaust gas away from a second exhaust manifold. The mixer is configured to direct the first and second portions of the exhaust gas from the first and second conduits, respectively, into an engine air intake system. The mixer is arranged to segregate the first and second portions of the exhaust gas while the first and second portions of the exhaust gas are within the mixer. The mixer forms a ring about a perforated tube. The mixer is configured to direct the first and second portions of the exhaust gas into the air intake system via the perforated tube.

Abstract: Methods and systems for maintaining a temperature of catalyst above a threshold temperature during vehicle braking and coasting is described. In one example, engine pumping work may be increased without increasing flow of cool fresh air through the engine's exhaust system to provide a desired level of engine braking. The net air flow through the engine may be reduced via activating a decompression actuator.

Abstract: Methods and systems for supplying post injection fuel to a two stroke diesel engine are described. In one example, post injection fuel timing is adjusted responsive to an amount of internal residual combustion products in a cylinder so that less post injected fuel may be trapped in the cylinder for a subsequent cycle of the cylinder. The start of post injection fuel timing and the amount of post injection fuel may be adjusted responsive to internal residual in the cylinder.

Abstract: Methods and systems for maintaining a temperature of catalyst above a threshold temperature during vehicle braking and coasting is described. In one example, engine pumping work may be increased without increasing flow of cool fresh air through the engine's exhaust system to provide a desired level of engine braking. The net air flow through the engine may be reduced via activating a decompression actuator.

Abstract: Methods and systems for increasing exhaust gas temperatures of an engine are described. In one example, engine exhaust gas temperatures may be increased via deactivating cylinders and flowing exhaust gases through deactivated cylinder. Engine pumping losses may be reduced via the exhaust gases that flow through the deactivated cylinder so as to reduce engine fuel consumption while heating an exhaust gas after treatment device.

Abstract: Methods and systems are provided for a vehicle wirelessly communicating with a central server. In one example, a method may include monitoring faults and sending engine conditions along with driver inputs to the central server for processing.

Abstract: Methods and systems are provided for cooling fuel in an engine. In one example, a fuel temperature is reduced by transferring heat from the fuel to a cooling fluid. The heat exchange may occur in an unpressurized region of a fuel system.

Abstract: Systems and methods are provided for using an electric machine as a generator to control boost during an engine cold start. In one example, a method may include receiving a request to increase an engine load during the engine cold start, determining an available capacity of a battery, operating the electric machine as a generator to increase the engine load with an electrical load, and responsive to the available capacity of the battery being less than a charge threshold, charging the battery with the electrical load while generating an increased boost pressure with an electric boosting device by powering the electric boosting device via the battery, and coordinating an amount of the increased boost pressure to compensate the electrical load. By increasing the engine load during the engine cold start, an exhaust gas temperature may be increased to achieve catalyst light-off.

Abstract: Methods and systems are provided for expediting heating of an engine and an emissions device upon cold startup of the engine. In one example, a method may include prior to cold startup of an engine, operating an e-compressor and opening a recirculation valve of a recirculation passage coupled across the e-compressor to flow compressed intake air from an outlet of the e-compressor through the recirculation passage to an inlet of the e-compressor and starting the engine upon a temperature at the outlet of the e-compressor reaching a threshold and continuing to operate the e-compressor while the engine is on. The heated intake air resulting from the flow of compressed intake air through the recirculation passage raises a temperature of combustion and a temperature of exhaust gas, which may decrease catalyst light-off time of the emissions device.

Abstract: Systems and methods are provided for using an electric machine as a generator to control boost during an engine cold start. In one example, a method may include receiving a request to increase an engine load during the engine cold start, determining an available capacity of a battery, operating the electric machine as a generator to increase the engine load with an electrical load, and responsive to the available capacity of the battery being less than a charge threshold, charging the battery with the electrical load while generating an increased boost pressure with an electric boosting device by powering the electric boosting device via the battery, and coordinating an amount of the increased boost pressure to compensate the electrical load. By increasing the engine load during the engine cold start, an exhaust gas temperature may be increased to achieve catalyst light-off.

Abstract: Compressors and methods for operating compressors are provided. In one example, a compressor is provided that comprises a ported shroud including a first port positioned upstream of a leading side of a rotor and a second port positioned downstream of the leading side of the rotor. The compressor also includes a muffler arranged in the ported shroud and comprising a plurality of projections, each of the plurality of projections radially extend from a base of the muffler and include an aperture extending through the base.

Abstract: Methods and systems for supplying fuel to a diesel engine during a cycle of a cylinder are described. In one example, a cylinder is supplied fuel via two fuel injectors having different fuel flow rates. The two fuel injectors may be operated to provide pilot, main, and post combustion fuel injections during a cycle of a cylinder.

Abstract: Systems are provided for cooling combustion chamber gasses and increasing an amount of air entrained in an injected fuel spray. In one example, a cooling passage may be included in an internal combustion engine, the cooling passage positioned exterior to a cylinder bore of the engine and coupled to the cylinder bore at a first opening and a second opening. The cooling passage may receive gasses from the cylinder bore via the first opening, and may cool the gasses as they travel through the cooling passage before returning the gasses to the cylinder bore via the second opening.

Abstract: Methods and systems for providing exhaust gas recirculation to a two stroke opposed piston diesel engine are described. In one example, high and low pressure exhaust gas recirculation systems may be activated or deactivated in response to exhaust gas hydrocarbon concentration and particulate matter flow rate from the engine. In addition, operation of the low and high pressure exhaust gas recirculation systems may be responsive to an operating state of a supercharger compressor.

Abstract: Methods and systems for providing engine braking for a two stroke diesel engine are described. In one example, a flow through a mechanically driven supercharger is adjusted to provide engine braking for a two stroke diesel engine when engine braking is requested. The level or amount of engine braking may be adjusted via increasing or decreasing flow through the mechanically driven supercharger.

Abstract: Methods and systems for providing engine braking for a two stroke diesel engine are described. In one example, a flow through a mechanically driven supercharger is adjusted to provide engine braking for a two stroke diesel engine when engine braking is requested. The level or amount of engine braking may be adjusted via increasing or decreasing flow through the mechanically driven supercharger.

Abstract: Methods and systems are provided for a ducted fuel injector. In one example, a method may include adjusting a temperature of combustion chamber gases in a combustion chamber and/or adjusting a fuel rail pressure in response to an amount of light sensed by a photodiode of the duct.

Abstract: Methods and systems are provided for actively heating pistons in combustion chambers to decrease a torque imbalance in an engine. In one example, a method for operation of an engine includes determining a variation between compression ratios in a first combustion chamber and a second combustion chamber and operating a piston heating system to apply a targeted amount of heat to a first piston assembly based on the variation between the compression ratios, the first piston assembly including a first piston positioned within the first combustion chamber.

Abstract: Methods and systems for estimating an amount of residual or retained fuel that remains in a cylinder from a first cycle of the cylinder to a second cycle of the cylinder are described. In one example, the amount of residual fuel is estimated in response to a temperature of an oxidation catalyst. The retained fuel amount may then be the basis for adjusting fuel injection amounts during the second cycle of the cylinder.