Abstract: An exhaust leak detecting apparatus includes an exhaust pressure sensor to detect the exhaust pressure in a portion of an exhaust passage that allows exhaust gas discharged from an engine to flow therethrough, the portion being located at a position upstream of a catalyst for purifying exhaust gas, and an exhaust leak determining part to determine that exhaust gas is leaking or may leak from the exhaust passage upstream of the catalyst and generate a warning when the exhaust pressure detected by the exhaust pressure sensor falls outside a predetermined range.

Abstract: Exhaust gas treatment system (100) for a motor vehicle, comprising a first catalytic converter (101-1) for selective catalytic reduction; a second catalytic converter (101-2) for selective catalytic reduction; a first nitrogen oxide sensor (103-1) upstream of the first catalytic converter (101-1) for detecting a first nitrogen oxide value (NOx-1); a second nitrogen oxide sensor (103-2) between the first and the second catalytic converter (101-1; 101-2) for detecting a second nitrogen oxide value (NOx-2); a third nitrogen oxide sensor (103-3) downstream of the second catalytic converter (101-2) for detecting a third nitrogen oxide value (NOx-3); an electronic evaluation device (105) for calculating a first efficiency of the first catalytic converter (101-1) on the basis of the first and the second nitrogen oxide value (NOx-1; NOx-2), a second efficiency of the second catalytic converter (101-2) on the basis of the second and the third nitrogen oxide value (NOx-2; NOx-3) and a total efficiency of the exhaust ga

Abstract: A sensor mounting table for mounting sensors to an aftertreatment system may include a sensor mounting plate having a substantially flat mounting surface for mounting one or more sensors associated with the aftertreatment system. The substantially flat mounting surface may be offset from a heat shield of the aftertreatment system. The sensor mounting table may further include an insulative material disposed between at least a portion of the substantially flat mounting surface of the sensor mounting plate and the heat shield. The sensor mounting plate may be configured to be attached to the aftertreatment system to secure the insulative material between the substantially flat mounting surface of the sensor mounting plate and the heat shield.

Abstract: A silencer insert (10) for a silencer of an exhaust system includes a first and a second partition wall (11, 12) and a connecting wall (13) arranged therebetween. The first partition wall (11) defines a first plane (E1), the second partition wall (12) defines a second plane (E2), and the connecting wall (13) defines a third plane (E3). At least one of the first partition wall, the second partition wall, and the connecting wall includes at least one perforated area (15). The connecting wall (13) is formed in one piece with the first partition wall (11) and the second partition wall (12). The first plane encloses with the second plane an angle of not more than 60°, the first plane and the second plane being particularly in parallel. A silencer is provided including a housing (1) receiving the silencer insert (10). A method is provided for manufacturing the silencer insert.

Abstract: A muffler, connected to an engine through an exhaust pipe, includes a shell serving as a muffler body, an inlet pipe configured to introduce exhaust gas from the engine into the shell, an outlet pipe configured to discharge the exhaust gas out of the shell, and a cap configured to be attached to a narrowed portion of the inlet pipe and control the direction in which the exhaust gas flows out. The cap is provided with an opening through which the exhaust gas passes and which regulates the direction in which the exhaust gas flows out.

Abstract: A 2-cycle, direct-injection diesel engine configured to accommodate low cetane diesel and jet fuels. The engine includes combustion chambers having surfaces which are operable at high temperatures during engine operation to increase the combustion rate of low cetane fuels. The engine is further configured to reduce starting times in cold and/or low pressure situations such as those experienced during attempts to restart a plane engine at relatively high altitudes.

Abstract: A cooling circuit for a vehicle includes: an electronic device disposed on a sub-water-cooling line; an intercooler disposed in parallel with the electronic device on the sub-water-cooling line; and a sub-radiator disposed on the sub-water-cooling line and configured to cool cooling water which passes through the electronic device and the intercooler before passing through the sub-radiator.

Abstract: A mining machine is provided. The machine includes a frame and an engine mounted on the frame. The machine also includes a heat exchanger and an aftertreatment system mounted on the frame. The machine further includes a cooling system disposed between the heat exchanger and the aftertreatment system. The cooling system includes a shroud member and a plurality of fans mounted on the shroud member. Each of the plurality of fans is adapted to provide a flow of air across the heat exchanger and around at least a portion of the aftertreatment system. The shroud member is split into a plurality of sections and each of the plurality of sections includes at least one of the plurality of fans therein.

Abstract: The invention relates to a cooling circuit (1) which comprises a first cooling loop I designed to provide thermal control of a first member and at least one second cooling loop II, III designed to provide thermal control of a second member; moreover, the cooling circuit (1) comprises a single degassing tank (6) in fluid connection with the first loop and with the at least one second cooling loop II, III and an isolating valve (70, 700) inserted between the degassing tank (6) and the at least one second cooling loop II, III designed for selectively blocking the flow between the degassing tank 6 and the at least one second cooling loop II, III.

Abstract: A coolant control valve unit includes a valve housing. The valve housing includes a first coolant supply passage and a second coolant supply passage, a coolant chamber in which coolant supplied through the first and second supply passages gathers, a first distribution passage and a second distribution passage being distributed from the coolant chamber to coolant components, and a bypass passage bypassing the first distribution passage. The coolant control valve unit also includes first and second valves disposed to open and close the first distribution passage and the second supply passage, a thermostat of a temperature sensitive type installed at the bypass and operating by a coolant temperature, a valve operator controlling movement of the first and second valves, respectively, and a wall formed at one side of the thermostat and in which a cooling passage is formed such that the coolant flows from the coolant supply passage to the second distribution passage.

Abstract: Methods and systems are provided for selectively re-cooling intake air downstream of a charge air cooler. In one example, a system may include a cylinder head defining a plurality of cylinders, the cylinder head including a plurality of inlet ports each fluidically coupled to a respective cylinder, a refrigerant supply, and a refrigerant passage surrounding each inlet port and fluidically coupled to the refrigerant supply, the refrigerant passage shaped to correspond to an outer profile of each inlet port.

Abstract: A snowmobile has a frame including an inverted U-shaped tunnel having top, left and right portions at least partly enclosing a space. A drive track, operatively connected to an engine, is disposed around a rear suspension and at least partly in the space. An air intake system has a heat exchanger surface disposed in or adjacent to the space. Air flowing through the intake system contacts the heat exchanger surface to be cooled thereby before entering the engine.

Abstract: A heat exchanger includes crimping plates fixed to an inlet and an outlet of a duct and having frame shapes corresponding to opening shapes of the inlet and the outlet. Each of the crimping plates includes a beam connecting two different positions on an inner periphery of the crimping plate. The beam has a rib.

Abstract: An electric turbocharger includes an electric motor which rotationally drives a rotating blade, a motor housing which accommodates the electric motor therein, a controller which is disposed outside the motor housing and controls the driving of the electric motor, and a power supply mechanism which supplies a current from the controller to the electric motor through a through-hole communicating the inside and the outside of the motor housing, in which the power supply mechanism includes a rod which is hermetically sealed while being inserted through the through-hole, a connector which is connected to at least one end of the rod, and a busbar which is connected to the connector, and in which the connector absorbs a relative positional displacement of the rod with respect to the connector.

Abstract: Method and internal-combustion engine arrangement, which comprises an internal-combustion engine comprising at least one cylinder and piston, which is arranged to operate according to the split-cycle principle, a turbocharger connected to the exhaust side of the engine for compressing the air with the aid of the exhaust gases of the internal-combustion engine in the first stage, a first intercooler for cooling the compressed air, and a mechanical compressor for further compressing the aid in the second stage, a second intercooler for cooling the compressed air, and in which the output of the mechanical compressor can be regulated according to the air requirement of the engine. The air thus compressed and cooled is led to the cylinder (cylinders) of the engine with the aid of its (their) extremely fast intake-air valve system as the engine's piston moves towards its upper dead centre.

Abstract: A multi-stage turbo supercharging system includes: a bypass passage which bypasses a turbocharger from among a plurality of turbochargers, in an intake passage or an exhaust passage of the engine; a bypass valve disposed in the bypass passage; an operation mode selection part; a bypass valve opening degree map selection part configured to select at least one bypass valve opening degree map in accordance with the operation mode selected by the operation mode selection part, from among a plurality of bypass valve opening degree maps which represent respective relationships between a plurality of control parameters of the engine and an opening degree of the bypass valve; a bypass valve opening degree determination part configured to determine an opening degree command value for the bypass valve on the basis of the bypass valve opening degree map and control parameter information representing the plurality of control parameters; and a bypass valve opening degree control part configured to control the opening degr

Abstract: A smooth shift is achieved between an operating region in which a first turbocharger is mainly operated and an operating region in which a second turbocharger is mainly operated. A PCM controls a throttle valve to use a first supercharging region in which a gas flow through an exhaust bypass passage is reduced and a second supercharging region in which the gas flow through the exhaust bypass passage is promoted differently based on the operating state of an engine. In an early stage of a shift from the first supercharging region to the second supercharging region, the PCM executes bridge control to allow the flow velocity of exhaust gas flowing into a large turbine to be higher than at a point in time at which the shift starts.

Abstract: A turbocharger system includes a wastegate with a bypass passage and a valve assembly. The valve assembly includes a poppet with an axis. The valve assembly also includes an arm that is attached to the poppet and that supports movement of the poppet between a closed position and an open position. Additionally, the valve assembly includes a plurality of biasing members that are disposed within a joint between the poppet and the arm. The plurality of biasing members provides a biasing force directed in a radial direction relative to the axis. The plurality of biasing members is disposed substantially symmetrically with respect to a first radial line of symmetry and a second radial line of symmetry.

Abstract: In a vehicle, a rod of a waste gate valve actuator reciprocates along a virtual plane which is parallel to both the central axis of a connecting shaft of a turbocharger and the cylinder axis of a cylinder hole. When viewed in the left or right direction of the vehicle, a main catalyst of a catalyst portion is provided forward of the cylinder axis of the cylinder hole. The flow direction of the exhaust gas in the main catalyst intersects with the reciprocating direction of the rod of the waste gate valve actuator when viewed in a direction orthogonal to both the central axis of the connecting shaft of the turbocharger and the central axis of the cylinder hole.

Abstract: A bottoming cycle power system includes an expander disposed on a crankshaft. The expander being operable to receive a flow of exhaust gas from a combustion process and to rotate the crankshaft as the exhaust gas passes through. An absorption chiller system has a generator section having a first heat exchanger to receive the flow of exhaust gas from the expander and to remove heat from the exhaust gas after the exhaust gas has passed through the expander. An evaporator section has a second heat exchanger to receive the flow of exhaust gas from the generator section and to remove heat from the exhaust gas after the exhaust gas has passed through the generator section. A compressor is disposed on the crankshaft and connected to the flow of exhaust gas. The compressor is operable to compress the exhaust gas after the exhaust gas has passed through the second heat exchanger.

Abstract: Various embodiments may include a turbocharger for an internal combustion engine comprising: a bearing housing with a rotor shaft mounted therein and an end shield comprising a housing end face; a turbine wheel on the rotor having a rear side facing the end shield; a turbine housing mechanically fixed to the bearing housing; a spiral path formed by the turbine housing and arranged around the turbine wheel, via which an exhaust-gas flow may supply a flow to the turbine wheel; and a first insulating element arranged in the spiral path providing thermal insulation of the turbine housing from the exhaust-gas flow, the first insulating element covering at least part of a spiral-path inner wall and comprising an integrated bearing housing heat shield providing thermal insulation of the bearing housing from the exhaust-gas flow.

Abstract: A chambered sparkplug carrier and a natural gas engine management system are provided for reducing NOx emissions of pre-chambered combustion natural gas engines. A method for retro-fitting a pre-chambered combustion natural gas engine with a chambered sparkplug is also described.

Abstract: A genset enclosure assembly comprises a first enclosure defining a first internal volume. A genset engine is positioned within the first internal volume. A first opening is defined in a first sidewall of a first side of the first enclosure. The genset enclosure assembly also includes a second enclosure defining a second internal volume. The second enclosure is positioned adjacent to the first side and removably coupled to the first side of the first enclosure. A first genset module is positioned in the second internal volume and operably coupled to the genset engine through the first opening.

Abstract: The invention relates to a reciprocating-piston engine, in particular an internal combustion engine having a variable compression ratio with a length adjusting device which is arranged in a connecting rod and which can be activated by a switching unit arranged in the connecting rod, wherein an actuating mechanism is operatively connected to the switching unit in the region of a connecting rod bearing in order to introduce a switching pulse into the connecting rod. The actuating mechanism has a deflection element with at least one first force-application region and at least one second force-application region, and the first force-application region and the second force-application region can be selectively contacted with at least one actuating device.

Abstract: A high-performance internal combustion engine includes: a crankshaft chamber; at least two cylinder chambers; a crankshaft linkage mechanism, disposed in the crankshaft chamber; at least two pistons, connected to the crankshaft linkage mechanism and accommodated in the cylinder chambers; an inlet pipe, only communicated with the crankshaft chamber; at least two flow guiding pipes, having one end thereof only communicated with the crankshaft chamber and another end thereof only communicated with the cylinder chamber; and a check valve unit, including a check valve disposed at a connecting location of the inlet pipe and the crankshaft chamber, and two first switch valves disposed at connecting locations of the flow guiding pipes and the cylinder chambers. Accordingly, the working efficiency of the high-performance internal combustion engine can be increased.

Abstract: A closed loop thermal cycle expander bypass flow control is described. An expander is positioned within and surrounded by a housing to receive a working fluid and rotate in response to expansion of the working fluid flowing through the expander. A bypass channel is positioned within and surrounded by the housing to define a fluid flow path that bypasses the expander. A fluid flow control sub-assembly is fluidically coupled to the expander and the bypass channel, and attached to the housing. The fluid flow control sub-assembly can receive the working fluid at a housing inlet and either flow the working fluid through the expander and block the working fluid from flowing through the bypass channel, or flow the working fluid through the housing bypassing the expander, flow the working fluid out via a housing outlet, and block the working fluid from flowing through the expander.

Abstract: A turbofan engine comprises a nacelle and an engine core having a core cowling. The internal surface of the nacelle and the external surface of the core cowling define a bypass duct having an exhaust end defining a bypass duct exit plane generally normal to the longitudinal axis of the engine. The core cowling extends aft of the bypass duct exit plane and has an annular or partly-annular exit ventilation nozzle located aft of a first longitudinal position and fore of a second longitudinal position, the first and second longitudinal positions being respectively fore of and either aft of or coincident with the bypass duct exit plane, the core cowling otherwise being free of exit ventilation nozzles fore of the second longitudinal position. The engine has a lower specific fuel consumption than an equivalent engine having an exit ventilation nozzle in a conventional position aft of the second longitudinal position.

Abstract: Combustion equipment includes annular combustion chamber having an annular upstream wall structure. Annular outer casing surrounds and is spaced from annular combustion chamber and annular inner casing is within and spaced from annular combustion chamber. Ogee shaped annular cowl is positioned upstream of annular upstream wall structure and a stage of compressor outlet guide vanes is positioned upstream of annular cowl. Pre-diffuser extends in downstream direction from stage of compressor outlet guide vanes, pre-diffuser is positioned upstream of cowl. Stage of compressor outlet guide vanes is connected to outer and inner casing. Outer fairing extends radially inwardly from outer casing such that annular outer casing, outer fairing and pre-diffuser define annular outer cavity and outer fairing is spaced from cowl or inner fairing extends radially outwardly from inner casing such that annular inner casing, inner fairing and pre-diffuser define an annular inner cavity and inner fairing is spaced from cowl.

Abstract: A gas turbine engine includes a bearing compartment that has at least one seal, a bearing disposed in the bearing compartment, a deoiler fluidly connected with the bearing compartment, and a vacuum generator fluidly connected with the deoiler.

Abstract: A fuel conduit for a fuel injector includes a coiled tube with a longitudinal segment arranged along a flow axis and a radial segment. The radial segment extends about the flow axis and is in fluid communication with the longitudinal segment. The wall one or more of the longitudinal and radial segments increases at a thickness transition location offset from a minimum radius of curvature location along the fuel conduit to limit stress within the fuel conduit. Fuel injectors and methods of making fuel injectors are also described.

Abstract: A fuel supply system has a fuel tank, a first fuel pump, and a first oxygen removal unit. The first fuel pump delivers fuel from the fuel tank into the first oxygen removal unit. A valve downstream of the first oxygen removal unit is operable to selectively deliver fuel back to the fuel tank in a bypass position or downstream to a use in a use position. A controller programmed to control the valve and the first fuel pump maintains the valve in the bypass position when an associated gas turbine engine is not operating. The controller moves the valve to the use positon when the associated gas turbine engine is operating. A gas turbine engine and a method of operating a fuel supply system are also disclosed.

Abstract: An exhaust processing system that includes: an exhaust passageway for directing exhaust gases, the exhaust passageway having passageway walls that define and enclose the exhaust passageway between an upstream position and a downstream position; and an acoustic liner formed against and covering at least one of the passageway walls of the exhaust passageway. The acoustic liner may include uniformly configured modular acoustic blocks fitted against each other. The modular acoustic blocks each may include interior cavities having different lengths configured to dampen targeted sound frequencies.

Abstract: An apparatus and a method for a circuit can include a voltage divider having a first and a second impedance in series, and having a voltage divider output. A switchable element is arranged in parallel with the first impedance and connected with the voltage divider output. The switchable element has an open state and a closed state. A spark gap device is configured to not generate a spark when the switchable element is in the open state and generate a spark when the switchable element is in the closed state.

Abstract: A gas turbine and a method for operating a gas turbine having a fuel gas monitoring system are presented. The fuel gas monitoring system may provide a measurement of a parameter of a fuel gas in real time. An operation of a gas turbine may be optimized to adapt variation in hydrocarbon content of a fuel gas from the measurement. The fuel gas monitoring system may provide an optical, flow through, online monitoring of fuel gas composition.

Abstract: Methods and systems are provided for operating a split exhaust engine system that provides blowthrough air and exhaust gas recirculation to an intake passage via a first exhaust manifold and exhaust gas to an exhaust passage via a second exhaust manifold. In one example, one or more valves of a set of first exhaust valves coupled to the second exhaust manifold may be deactivated in response to select engine operating conditions, while maintaining active all valves of a set of second exhaust valves coupled to the first exhaust manifold. The select engine operating conditions may include one or more of a deceleration fuel shut-off condition, a part throttle condition, and a cold start condition.

Abstract: Methods and systems are provided for improving calibration of a variable compression ratio engine. Cylinder-to-cylinder compression ratio variations are detected and accounted for by comparing cylinder fuel flow and IMEP at each compression ratio setting. Dilution parameters including EGR and VCT schedule are also calibrated to account for the cylinder-to-cylinder compression ratio variations.

Abstract: A control system of an internal combustion engine includes an S/V ratio changing mechanism able to change an S/V ratio of a combustion chamber and a detection device having an output value changing in accordance with a hydrogen concentration in exhaust gas, which increases along with an increase in the S/V ratio, the internal combustion engine being controlled by the output value of the detection device. Further, the output value of the detection device or a parameter relating to operation of the internal combustion engine is corrected in accordance with the S/V ratio of the above S/V ratio changing mechanism.

Abstract: A dual-fuel fuel injection system for an internal combustion engine has a liquid fuel injection branch and a gas fuel injection branch, in which a gas injector assembly that is controllable via a control fluid is situated. The liquid fuel forms the control fluid of the gas injector assembly.

Abstract: Methods and systems for operating an engine that includes four compressors for two cylinder banks are described. In one example, output of two compressors and positions of valves are adjusted responsive to an engine air flow amount to prevent air from back flowing through a compressor. Output from the two compressors may be combined for higher engine air flow amounts.

Abstract: The present disclosure provides a method for predicting a fluid type, comprising sensing, by a first sensor, mass flow data of a fluid in an engine, wherein the first sensor operates based on a first fluid property; sensing, by a second sensor, mass flow data of the fluid, wherein the second sensor operates based on a second fluid property; and detecting, by a logic circuit of a controller, a percent difference in the mass flow data provided by the first and second sensors, the percent difference indicating that the fluid is comprised of at least a first fluid type.

Abstract: A fuel reforming system is provided. The system includes an engine combusting reformed gas to generate mechanical power and an intake line connected with the engine to supply the reformed gas and air to the engine. An exhaust line is connected with the engine to circulate exhaust gas and a fuel reformer disposed at an exhaust gas recirculation (EGR) line diverging from the exhaust line mixes the exhaust gas passing through the EGR line with fuel and reforms the mixed fuel. An exhaust gas purifying catalyst disposed at the exhaust line purifies nitrogen oxide in the exhaust gas. A temperature sensor at the exhaust line of the exhaust gas purifying catalyst measures temperature of the exhaust gas purifying catalyst. A bypass controller then operates a bypass valve to supply or cut off the exhaust gas into the fuel reformer according to temperature of the exhaust gas purifying catalyst.

Abstract: A system and method to perform bypass actuation detection includes alternating control of a bypass valve within an exhaust gas recirculation (EGR) system of a vehicle to direct flow of gas through a cooler module or a bypass module within the EGR system. The method also includes determining a position of an EGR valve that directs the gas into the EGR system, and verifying operation of the bypass valve based on the position of the EGR valve.

Abstract: An internal combustion engine includes a filter, which is configured to trap particulate matter in exhaust gas, an EGR passage, which connects a section of an exhaust passage that is upstream of the filter to an intake passage, and an EGR valve, which is configured to adjust a cross-sectional flow area of the EGR passage. A controller for the internal combustion engine includes processing circuitry, which is configured to execute a limiting process of limiting an opening degree of the EGR valve such that the opening degree is likely to decrease when an amount of the particulate matter trapped by the filter is great as compared to when the amount is small.

Abstract: A vehicle system includes: an engine including a combustion chamber in which an air-fuel mixture is burned to generate energy, an intake manifold which supplies air to the combustion chamber, an injector which supplies fuel to the combustion chamber, and an exhaust manifold which discharges exhaust gas generated by combustion of the air-fuel mixture through an exhaust pipe; a hybrid starter and generator (HSG) which generates electricity by starting the engine or by using energy generated in the engine; a soot filter which is mounted to the exhaust pipe and collects particulate matters (soot) included in exhaust gas; and a control unit which controls an operation of the injector and controls an operation of the HSG, in which when the quantity of soot is larger than a predetermined quantity, the control unit increases a size of a load of the HSG by a predetermined load quantity until a temperature of the soot filter reaches a predetermined temperature.

Abstract: Various embodiments include a method for operating an internal combustion engine with a fuel injection system including a piezo actuator comprising: stopping the discharge phase of the actuator during an injection cycle; measuring a voltage profile at the actuator; comparing a feedback signal at the actuator with a setpoint value; varying the discharge time of the actuator in successive injection cycles until the feedback signal corresponds to the setpoint value; defining a servo valve closing time as a defined offset with respect to the optimized discharge time; and using the defined servo valve closing time to set an injection quantity of fuel for future injection cycles.

Abstract: A filter monitor system (“FMS”) module is installed on the engine/vehicle and is connected to the filter systems, sensors and devices to monitor various performance parameters. The module also connects to the engine control module (“ECM”) and draws parameters from the ECM. The FMS module is capable of interfacing with various output devices such as a smartphone application, a display monitor, an OEM telematics system or a service technician's tool on a computer. The FMS module consists of hardware and software algorithms which constantly monitor filter systems and provide information to the end-user. FMS module provides necessary inputs and outputs for electronic sensors and devices.

Abstract: An abnormality detection device includes: an opening degree acquisition unit, which acquires a plurality of opening degree data indicating an opening degree of a valve provided in a vehicle, the opening degree being measured during a certain period; an integration unit, which calculates an integrated value of a plurality of differences by integrating the plurality of differences between a plurality of opening degree actual measurement values indicated by the plurality of opening degree data acquired by the opening degree acquisition unit and an opening degree target value of the valve; and a determination unit, which determines that there is an abnormality in the vehicle when the integrated value integrated by the integration unit is higher than a certain value.

Abstract: An engine diagnostic system includes a control system having a controller operatively connected to an engine. A monitoring system has a sensor operatively connected to the engine. A diagnostic system is operatively connected to the engine. The diagnostic system is configured to implement a sensor diagnostic procedure that includes a sensor health test. The sensor health test includes comparing a measured value of a sensor to an expected value and determining the health of the sensor based on the difference between the measured value and the expected value. The sensor diagnostic procedure can also include telematics data analysis.

Abstract: Methods and systems are provided for improving calibration of a variable compression ratio engine. Cylinder-to-cylinder compression ratio variations are detected and accounted for by comparing cylinder fuel flow and IMEP at each compression ratio setting. Dilution parameters including EGR and VCT schedule are also calibrated to account for the cylinder-to-cylinder compression ratio variations.

Abstract: A fuel injection control system is usable with an engine, e.g., a diesel engine of a mild hybrid electric vehicle. The control system includes an auxiliary battery, a high-voltage (HV) battery, e.g., 48 VDC, a switching circuit with first and second switching pairs, a controller, and a fuel injector system. The controller opens and closes the switches to command an electrical current from the auxiliary or HV battery according to a predetermined injector current profile. The fuel injector system has one or more control solenoids. Windings of the solenoids are electrically connectable to the HV battery during a boost phase of the profile via opening of the first switching pair and closing of the second switching pair, and to the auxiliary battery during peak, by-pass, hold, and end-of-injection phases of the profile via closing of the first switching pair and opening of the second switching pair.