Abstract: A supercharged internal combustion engine, comprising a high-pressure turbine connected to a channel of a low-pressure turbine and a bypass line, branching from upstream the high-pressure turbine, connectable to the channels of the low-pressure turbine via a control element positioned within the bypass line, is provided. Adjusting the control element fluidly connects each of the channels of the low-pressure turbine to the bypass line responsive to the exhaust-gas flow rate to optimize the performance of the engine.

Abstract: An engine system may include a main intake line, a supplementary intake line branched from the main intake line and joined to the main intake line, an intake bypass valve mounted to the main intake line, a main exhaust line mounted to an exhaust manifold, a supplementary exhaust line branched from the exhaust manifold and joined to the main exhaust line, an exhaust bypass valve mounted to the main exhaust line and selectively opening the main exhaust line, a turbocharger disposed adjacent to the supplementary exhaust line and operated by exhaust gas passing through the supplementary exhaust line, and a control unit for controlling the intake bypass valve and the exhaust bypass valve depending on an operation condition, wherein the exhaust gas is re-circulated from an upstream side of the exhaust bypass valve to the main intake line passing through an EGR (Exhaust Gas Recirculation) cooler and an EGR valve.

Abstract: A turbocharging device of an engine for a vehicle is provided. The turbocharging device includes a turbocharger for turbocharging intake air, an introduction passage connected to an introducing section of a compressor of the turbocharger, a discharge passage connected to a discharging section of the compressor of the turbocharger, a bypass passage connecting the introduction passage to the discharge passage and bypassing the compressor, and a bypass valve for opening and closing the bypass passage. A throttle part throttling a flow passage area of the introduction passage is formed in an inner circumferential surface of a part of the introduction passage, upstream of a connection part of the introduction passage with the bypass passage.

Abstract: An arrangement for cooling of recirculating exhaust gases of a combustion engine (2) in a vehicle (1). The arrangement comprises a first EGR cooler (14), a driving means (15, 31) adapted to driving air through the first EGR cooler (14) in order to cool the exhaust gases in a return line (11) which are subjected to a first step of cooling in the first EGR cooler (14), and at least one second EGR cooler (19, 20) in which the exhaust gases in the return line (11) are intended to undergo a second step of cooling. The arrangement comprises an air line (16) which extends at least from the first EGR cooler (14) to the exhaust pipe (4) at a location between the turbine (5) and the exhaust-treating component (18a, 18b), which air line (16) is adapted to leading warm air from the first EGR cooler (14) into the exhaust line (4) at said location.

Abstract: An exhaust gas purification device to elevate the exhaust gas temperature on an inlet side of a diesel particulate filter. An oxidation catalyst and the diesel particulate filter are arranged in an exhaust path between exhaust ports of an engine and a turbocharger. The device also includes a urea spraying nozzle on an upstream side of the diesel particulate filter, and a selective catalytic reduction unit in an exhaust pipe on a downstream side of the turbocharger.

Abstract: Methods and systems are provided for managing a compressor temperature using EGR to address surge and condensation. A variable mixture of cooled compressor recirculation flow and hot EGR is provided to a compressor inlet. A composition of the mixture is adjusted to maintain a compressor inlet temperature sufficiently warm so as to reduce ingestion of condensation, and a compressor outlet temperature sufficiently cold to be within component temperature limits with flow above the surge limit.

Abstract: Methods and systems are provided for varying a proportion of compressed air recirculated to a compressor inlet from a location downstream of the compressor and upstream of a charge air cooler and a location downstream of the charge air cooler. A temperature-controlled compressor recirculation flow is used to reduce condensation from EGR being ingested into the compressor. The temperature-controlled compressor recirculation flow is also used to address compressor surge.

Abstract: In a method for operating a supercharged internal combustion engine of a motor vehicle, at the same time an internal exhaust gas recirculation and an external exhaust gas recirculation are carried out in an engine operating range with lean burn operation modes, wherein the exhaust gas recirculation rate of the internal and the external exhaust gas recirculation is increased with increasing load and/or speed of the internal combustion engine in the lean engine operating range and, at high engine speeds and loads, a homogenous mixture operation is carried out. The invention also reside in an internal combustion engine for performing the method.

Abstract: A method of adjusting an external exhaust gas recirculation mixture in response to engine knock of a spark-ignition turbocharged engine, and related products.

Abstract: Methods and systems are disclosed for controlling an exhaust gas recirculation valve in an engine by determining errors in exhaust backpressure estimates and adapting EGR flow estimations based on these errors to meet target EGR dilutions in the engine. In one example approach, a method comprises adjusting valve position based on desired EGR flow and estimated EGR flow, where the estimated flow is based on estimated exhaust backpressure, and the estimated exhaust backpressure is updated based on errors between actual and desired intake oxygen concentration.

Abstract: Exhaust temperature management strategies for an opposed-piston, two-stroke engine with EGR are based on control of a ratio of the mass of fresh air and external EGR delivered to a cylinder to the mass of the trapped charge (density of the delivered charge multiplied by the trapped volume at port closing).

Abstract: A fluid handling system for a use with an engine is provided. The fluid-handling system may have a first turbine connected to receive a portion of an exhaust flow from the engine, a first compressor driven by the first turbine to pressurize an airflow, and a heat exchanger configured to receive a remaining portion of the exhaust flow from the engine and the airflow from the first compressor. The fluid-handling system may also have a second turbine connected to receive the airflow from the heat exchanger, and a generator driven by the second turbine to generate power.

Abstract: The present disclosure relates to methods, apparatuses and systems to manage exhaust gas expelled from cylinders of an internal combustion engine. An exemplary system may comprise at least one cylinder of the engine configured to operate as a dedicated exhaust gas recirculation (EGR) cylinder, and wherein substantially all exhaust gas expelled from the dedicated EGR cylinder is recirculated to an intake system of the engine. In one embodiment, the system may include a flow restrictor configured and arranged to restrict a flow of the recirculated exhaust gas to the dedicated EGR cylinder without restricting a flow of the recirculated exhaust gas to the remaining cylinders of the engine. In another embodiment, exhaust gas may be expelled from the dedicated EGR cylinder in pulsations, and the intake system may be configured to reduce an amplitude of the pulsations of the exhaust gas expelled from the dedicated EGR cylinder.

Abstract: A Rankine circuit (40) includes, as a plurality of heat exchangers, an EGR cooler (36) of an EGR circuit and an exhaust gas heat exchanger (41) associated with an exhaust passage. The EGR cooler and the exhaust gas heat exchanger are arranged such that the EGR cooler is located upstream of the exhaust gas heat exchanger as viewed in the flowing direction of a working fluid in the Rankine circuit. The amount of heat transferred from EGR gas to the working fluid in the EGR cooler is controlled by a control unit (60) so that the temperature of the EGR gas detected by an EGR gas temperature detector (39) may fall within a predetermined temperature range (e.g., 150° C. to 200° C.).

Abstract: An exhaust system for an engine includes a first exhaust manifold configured to receive exhaust from the engine, a second exhaust manifold configured to receive exhaust from the engine in parallel with the first exhaust manifold, and at least two turbochargers configured to receive exhaust from the first and second exhaust manifolds. The system also includes a first turbocharger valve fluidly connected to one of the at least two turbochargers. The first turbocharger valve is configured to selectively fluidly connect the one of the at least two turbochargers to the first and second exhaust manifolds. The system further includes a recirculation circuit in fluid communication with the first exhaust manifold. The recirculation circuit includes a first recirculation valve configured to regulate passage of exhaust through the recirculation circuit.

Abstract: A disclosed method of operating an engine may include discharging exhaust gas from at least one combustion chamber of the engine. The method may also include recirculating at least a portion of the exhaust gas to the at least one combustion chamber through an EGR system, including directing at least a portion of the exhaust gas through an EGR duct. Additionally, the method may include sensing pressure in a portion of the EGR duct by directing the pressure to a first pressure sensor via a first sensor passage having a first end connected to a portion of the EGR duct and a second end connected to the first pressure sensor, while maintaining a temperature of gas in the first sensor passage adjacent the second end at a bulk temperature of at least about 75 percent of a bulk temperature of gas in the first sensor passage at the first end.

Abstract: A method of imposing a variable load upon the internal combustion engine as it is typically used in the performance of degassing operations includes coupling a crankshaft of the internal combustion engine to a secondary internal combustion engine.

Abstract: A device for cooling a gas flow of an internal combustion engine includes a housing, an inlet and an outlet for a gas of the internal combustion engine, which is to be cooled, an inlet and an outlet for a liquid coolant, a heat exchanger for heat transfer between the gas and the coolant, a first wall section of the housing, wherein the first wall section is arranged between the coolant and the gas flow, and a second wall section of the housing, wherein the second wall section is arranged between the coolant and the atmosphere, wherein the first wall section and the second wall section are integrally formed in one piece.

Abstract: A turbocharger is disclosed for use with an engine system. The turbocharger may have a housing at least partially defining a compressor shroud and a turbine shroud. The turbine shroud may form a first volute and a second volute, each having an inlet configured to receive exhaust from an exhaust manifold of the engine in a tangential direction, and an axial channel disposed downstream of the inlet. The turbocharger may also have a turbine wheel disposed within the turbine shroud and configured to receive exhaust from the axial channels of the first and second volutes, a compressor wheel disposed within the compressor shroud, and a shaft connecting the turbine wheel to the compressor wheel. The turbocharger may further have a nozzle ring in fluid communication with the axial channels of the first and second volutes at a location upstream of the turbine wheel.

Abstract: An engine system may include an electric or mechanical supercharger and an LP-EGR, basically with a turbocharger, an EGR valve, a channel control valve, and a bypass valve, which control the flow rate of external air and exhaust gas, may be integrally operated, and a operation section may be divided into a turbo-lag and low torque section, a mid-load section, and mid/high-load section such that the open amount of EGR valve, channel control valve, and bypass valve may be optimally controlled, such that it may be possible to improve availability for a low-speed/high-load section with turbo-lag reduced, using supercharger and considerably increase the ratio of fuel efficiency improvement in the low-speed/high-load section, using LP-EGR operating with supercharger.

Abstract: Systems and methods for operating a turbocharged engine are described. In one example, a turbocharger system, comprising: a bearing housing including a turbine and at least one compressor coupled to the turbine via a shaft; and wherein the turbine comprises a stator stage and a rotor stage mounted to the cylinder head by the bearing housing and positioned in an exhaust passage of a cylinder head. In this way, a more compact design is achieved which eliminates the cost and complexity of a turbine housing and improves turbine efficiency by positioning the turbine closer to the exhaust pulses.

Abstract: In an engine with a supercharger, a low pressure loop EGR apparatus includes a EGR passage to allow part of exhaust gas discharged from a combustion chamber of the engine to an exhaust passage to flow as EGR gas in an intake passage to return to the combustion chamber, and a EGR valve to regulate a flow of EGR gas in the EGR passage. The EGR passage has an inlet connected to the exhaust passage downstream of a turbine and an outlet connected to the intake passage upstream of a compressor. An ECU controls the EGR valve while the engine is in a predetermined operating condition, and determines whether or not the EGR valve is failed based on changes in intake amount in the intake passage during control of the EGR valve.

Abstract: A method for reducing turbolag in a turbocharged internal combustion engine includes demanding torque for shifting the internal combustion engine from a stationary engine mode to a transient engine mode, closing an exhaust gas recirculation (EGR) valve during the transient engine mode, repositioning guide vanes of a Variable Geometry Turbine (VGT) turbo unit from a first position when in the stationary engine mode to a second position when in the transient engine mode, increasing a duration of overlapping of at least one inlet valve and at least one outlet valve provided in a cylinder head of the internal combustion engine from as first duration when in the stationary mode to a second duration when in the transient mode for increasing the amount of air flowing from an inlet manifold to an exhaust manifold and thereby increasing acceleration of a turbine of the VGT turbo unit.

Abstract: An exemplary turbocharger system for an internal combustion engine is provided. The turbocharger system includes a first turbine and a second turbine. The first turbine is in fluid communication with the internal combustion engine. The first turbine receives a first portion exhaust gas discharged from the internal combustion engine and provides a first turbine exhaust gas. The second turbine is in fluid communication with the first turbine via an inter-stage channel. The inter-stage channel transports the first turbine exhaust gas from the first turbine to the second turbine. The inter-stage channel is in thermal connection with an exhaust gas recirculation channel defined between an inlet and an outlet of the internal combustion engine. The first turbine exhaust gas flowing through the inter-stage channel is capable of being heated by a second portion exhaust gas discharged from the internal combustion engine and flowing through the exhaust gas recirculation channel.

Abstract: A system and method for operating an engine turbocharger is described. In one example, the turbocharger is rotated in different directions in response to operating conditions. The system and method may reduce engine emissions.

Abstract: A waste heat recovery apparatus for use with an internal combustion engine includes a working fluid circuit having a first heating line and a second heating line parallel to the first heating line, a first heat exchanger in the first heating line operatively connected to transfer heat energy to the working fluid from a waste exhaust flow of an internal combustion engine, a second heat exchanger in the second heating line operatively connected to transfer heat energy to the working fluid from recirculating exhaust gas the internal combustion engine, and a recuperative heat exchanger operatively connected to transfer heat energy to the working fluid in the first heating line from the working fluid at a junction of an expander outlet and condenser inlet.

Abstract: The present disclosure refers to a turbocharged internal combustion engine with exhaust gas recycling, comprising an intake manifold, an exhaust manifold, a fresh air turbocharger and an exhaust supercharger, wherein the intake manifold is divided by a separating wall into a fresh air passage and an exhaust passage, one of the passages being connected to inlet openings of cylinders of the engine, the fresh air passage being connected to the outlet of the compressor of the fresh air turbocharger, the exhaust passage being connected to the outlet of the compressor of the exhaust supercharger and the separating wall being formed with orifices connecting the two passages.

Abstract: A fixed positive displacement exhaust gas recirculation (EGR) system includes an intake manifold in fluid communication with a fresh intake air source, an exhaust manifold, and an engine having at least one EGR cylinder and at least one non-EGR cylinder. The at least one EGR cylinder is in fixed fluid communication with the intake manifold such that substantially all of the exhaust gas flows from the at least one EGR cylinder to the intake manifold, and the at least one non-EGR cylinder is in communication with the exhaust manifold such that exhaust gas flows from the at least one non-EGR cylinder into the exhaust manifold.

Abstract: A method for adjusting an exhaust heat recovery valve is presented. In one embodiment, the method may control an amount of boost provided by a turbocharger to an engine.

Abstract: An engine is described having an engine control unit and two or more hydraulically operated wheels, wherein a fluid is flowed from an accumulator to the engine via the first wheel to assist in acceleration of the turbocharger in response to an acceleration signal from the engine control system and wherein the fluid is flowed from the engine to the accumulator via the second wheel to decelerate the turbocharger in response to a deceleration signal from the engine control unit. In one particular embodiment, the second wheel absorbs energy from the turbocharger in response to the deceleration signal from the engine control unit to decelerate the turbocharger. In some embodiments, the hydraulically operated wheels may be positioned on the same shaft of, and between, the turbine and compressor of the turbocharger.

Abstract: An internal combustion engine comprises a compressor disposed in an intake system configured to compress combustion air and deliver it to cylinders of the engine. A compressor inlet assembly has a combustion air inlet, in fluid communication with, and configured to receive combustion air from the intake system. A combustion air passage extends through the assembly to an outlet located downstream of the inlet and is configured for fluid communication with the compressor. An EGR mixing conduit is disposed within the compressor inlet assembly and has an EGR inlet configured for fluid communication with, and receipt of EGR from, an EGR supply conduit. An EGR passage extends from the EGR inlet to an EGR supply annulus disposed about the combustion air inlet opening and a plurality of EGR ports extend between the EGR supply annulus and the combustion air passage for delivery of EGR thereto.

Abstract: A supercharger-equipped internal combustion engine in the present invention includes a turbo-supercharger (20) which includes, at some point in an intake passage (26), a centrifugal compressor (20b) having an impeller section (20b4) for housing a compressor impeller (20b3). In the supercharger-equipped internal combustion engine, EGR gas and blow-by gas are introduced into an intake system in such a way as to flow into the centrifugal compressor (20b) via an EGR gas introduction section (40a) and a blow-by gas introduction section (48a). The supercharger-equipped internal combustion engine further includes a partition wall (52) which guides the EGR gas and the blow-by gas toward the centrifugal compressor (20b) so that the EGR gas and the blow-by gas are not mixed with each other until the EGR gas and the blow-by gas enter into the impeller section (20b4).

Abstract: Systems and methods for internal combustion engine operation with exhaust gas recirculation and turbocharging are disclosed. The systems include an exhaust gas recirculation loop for recirculating exhaust gas flow from a first portion of the cylinders of the engine into an intake system prior to combustion. The system further includes a turbine with first and second inlets for receiving exhaust gas flows from respective first and second parts of the exhaust gas of the remaining portion of the cylinders.

Abstract: An exhaust gas condensate control method includes selecting modeling objects from the exhaust gas recirculation (EGR) system, acquiring control factors from the modeling objects, such as mass, temperature, pressure, absolute humidity, relative humidity, partial water vapor pressure of the exhaust gas and a gas mixture, calculating an estimated relative humidity value, a desired relative humidity value from estimated relative humidity value, and an allowable relative humidity limit and a current relative humidity value of the EGR system, and precluding production of condensate in the EGR system by feedback-controlling the intake air flow rate of a mixing pipe line, the opening amount of an LP-EGR (low pressure) valve, and boost pressure by using an applied control value compensating the desired relative humidity value. An EGR system may be an LP-EGR type or an HP-EGR (high pressure)+LP-EGR type.

Abstract: A method for desulphurizing an exhaust-gas recirculation flow of an internal combustion engine supplied to the internal combustion engine on the fresh-air side includes branching a partial exhaust-gas flow from the exhaust-gas flow of the internal combustion engine. At least one reactant is supplied to the partial exhaust-gas flow that splits to form ammonia, and the thus laden partial exhaust-gas flow is supplied partially, as an exhaust-gas recirculation flow, to the fresh-air side and partially, as an aftertreatment partial flow, to an exhaust-gas aftertreatment system. The flow rate of the exhaust-gas recirculation flow supplied to the fresh-air side and the flow rate of the aftertreatment partial flow supplied to the exhaust gas aftertreatment system are predefined and/or varied by a regulating device as a function of at least one operating parameter that defines the respective operating state of the internal combustion engine.

Abstract: An internal combustion engine comprises a four stroke working cylinder, a four stroke EGR cylinder, an intake system for supplying a combustion air charge to the cylinders, a first exhaust system for removing exhaust gas from the four stroke working cylinder and to the atmosphere and a second exhaust system for removing exhaust from the four stroke EGR cylinder and to the intake system, wherein the combustion air charge is a combination of combustion air and exhaust gas from the four stroke EGR cylinder.

Abstract: A method is provided for controlling EGR flow in turbocharged engine. The method comprises operating a low-pressure exhaust gas recirculation (LP-EGR) system at a fixed EGR percentage rate of fresh airflow from mid-load down to a minimum engine load, even as load changes. In this way, errors in the delivered LP-EGR rate during transient conditions may be alleviated by providing a fixed EGR percentage of fresh airflow at all engine loads within a fixed mode range.

Abstract: An exhaust circulation apparatus that can improve fuel combustion and suppress discharged NOx by expanding an operating region in which homogeneous lean combustion is possible. The exhaust circulation apparatus includes a homogeneous lean combustion unit for performing homogeneous lean combustion in a predetermined lean-burn region, and an EGR apparatus for performing EGR that recirculates a portion of gas that flows through an exhaust system of the internal combustion engine to an intake system. When performing homogeneous lean combustion, the exhaust circulation apparatus controls the EGR apparatus to perform EGR. An LPL-EGR apparatus that recirculates gas flowing through an exhaust passage on a downstream side of a turbine to an intake passage on an upstream side of a compressor is used as the EGR apparatus. Preferably, an air-fuel ratio is controlled so as to be 22 and an EGR rate is controlled so as to be between 10% and 20%.

Abstract: An integrated water-gas-shift (WGS) and emissions control device (ECD) catalyst for treating exhaust from an internal combustion engine. The engine is assumed to have an EGR loop, such that exhaust is recirculated back to the engine's intake. A WGS catalyst on the EGR loop, for conditioning the EGR flow, is integrated with a catalyzed ECD on the main exhaust line, for reducing pollutant emissions.

Abstract: An internal combustion engine includes a plurality of cylinders, an air intake line and an exhaust line collecting exhaust gas. The engine also includes an EGR line for rerouting a part of the exhaust gas from the exhaust line towards the air intake line and at least a first turbocharger comprising a first turbine driven by the exhaust gas flowing towards the atmosphere, linked to a first compressor located on the air intake line. The engine further includes a variable geometry EGR turbine located on the EGR line, driven by the EGR gas flowing in the EGR line. Thus, thanks to the pressure reduction occurring in the turbine, the EGR gas temperature is lowered, and less cooling power from the engine cooling system is required to cool down the EGR.

Abstract: An exhaust system for a turbocharged internal combustion engine comprises a first exhaust conduit extending between a first engine cylinder and a turbocharger inlet and is configured to conduct exhaust gas therebetween. A second exhaust conduit extends between a second engine cylinder and an in inlet for an exhaust gas recirculation system and is configured to conduct exhaust therebetween. An exhaust gas bypass extends between, and is in fluid communication with, the first and second exhaust conduits and is configured to divert exhaust gas flowing through the second exhaust gas conduit to the first exhaust gas conduit, and the turbocharger inlet, under conditions of varying exhaust gas recirculation demand of the internal combustion engine.

Abstract: A turbine includes a turbine housing having two gas passages of substantially the same flow area. A nozzle ring is disposed in the housing and around the turbine wheel. The nozzle ring includes first and second outer rings, and an inner ring disposed between the first and second outer rings. First and second pluralities of vanes are disposed between the rings. The second outer ring has a thicker cross section than the first outer ring such that a larger flow area is created between the first outer ring and the inner ring than a flow area created between the second outer ring and the inner ring.

Abstract: A system and method are provided for estimating the operating speed of a turbocharger. A first pressure value corresponds to pressure at or near the air inlet of the compressor, and a second pressure value corresponds to pressure at or near the air outlet of the compressor. A temperature value corresponds to a temperature at or near the air inlet of the compressor, and a flow rate value corresponds to a flow rate of air entering the air inlet of the compressor. The operating speed of the turbocharger is estimated as a function of the first pressure value, the second pressure value, the temperature value and the flow rate value.

Abstract: A mixer, for use with an internal combustion engine, for mixing EGR gas from an EGR loop with fresh air from the engine's fresh air intake. The mixer has an outer shell having the general shape of a thin-shelled hollow cylinder with a side entry port. One end of the cylinder provides a straight entry port and the other end of the cylinder provides a straight exit port. An inner sleeve fits inside the outer shell such that a space is provided between the inner sleeve and the outer shell, and a passageway is formed inside the inner sleeve through the length of the mixer. The inner sleeve has a series of flow ribs extending from its outer surface within the space, and has entry holes for providing fluid communication from the space into the passageway.

Abstract: An engine system, comprising a first gaseous fuel source with a first gaseous fuel located therein coupled to one or more engine cylinders and an exhaust gas recirculation (EGR) system with a reform catalyst located therein, the reform catalyst reforming natural gas into a gas with a wider AFR operating range. The engine may thus operate at an AFR that may be outside of that available during natural gas combustion alone to allow for cooler engine operation.

Abstract: A method and system is provided for a turbocharged multi-cylinder internal combustion engine comprising a two-channel turbine and at least two groups of cylinders, wherein one group of cylinders is switchable responsive to an engine load over a threshold. Exhaust lines of each group of cylinders are arranged in a targeted manner to couple with the turbine such that the switchable group is attached to one channel and the active group is attached to the other channel to reduce the difference in distances that pressure pulses travel, wherein a shut-off element is provided in the channel attached to the switchable group and may be moved to block exhaust flow through the channel when the cylinders are deactivated, thus improving the partial deactivation and turbocharging characteristics of the engine.

Abstract: Various methods and systems are provided for flowing fluid through a passageway block. In one embodiment, a passageway block comprises a first passage and a second passage, each of the first passage and the second passage including inlets and outlets to the passageway block, none of the inlets and outlets being concentric with one another; but within the passageway block, for at least a portion, a third passage concentrically surrounds the second passage.

Abstract: A method for determining intake air leakage in a low pressure EGR system may include a first step of measuring an intake air leaking amount Leak_Air, a second step of determining whether intake air may be leaked by comparing the intake air leaking amount Leak_Air and an intake air leakage determination value Leak_Air_Det with each other, and a third step of notifying leakage information against an intake air leakage when the intake air leakage may be settled.

Abstract: A method to avoid over-dilution of an intake-air charge of an engine includes, during a first condition, applying at least some feedback control to the opening and closure of a valve that adjustably admits exhaust to the intake-air charge. During a second condition predictive of compressor surge, no feedback control is applied to the opening or the closure of the valve. Rather, feedforward control is applied to the closure of the valve so that stability in the engine is maintained even during surge conditions.

Abstract: A lubrication system for an engine is disclosed. The lubrication system may have an oil pump configured to lubricate the engine. The lubrication system may also have a valve configured to direct oil from the oil pump to a fuel pump associated with the engine. The lubrication system may further have a controller. The controller may be configured to determine an operating speed of the engine. The controller may also be configured to adjust the valve to selectively direct the oil to the fuel pump based on the operating speed.