Abstract: Methods and systems are provided for exhaust heat recovery and hydrocarbon trapping at an exhaust bypass assembly. Exhaust gas may flow in both directions through an exhaust bypass passage and each of a HC trap and a heat exchanger coupled to the bypass passage. The HC trap may be purged with the hot exhaust and heat from the exhaust may be recovered at the heat exchanger.

Abstract: A method is disclosed for operating an aftertreatment system having a diesel particulate filter of an internal combustion engine of an automotive system. A regeneration event of the diesel particulate filter is started. The presence of an object ahead of the automotive system is detected. A value of a deceleration that the automotive system should perform in order to avoid a collision with the object is determined. A temperature of the diesel particulate filter is reduced if the value of the deceleration is greater than a first predetermined threshold value.

Abstract: A method for determining a mass flow of ammonia between two SCR catalytic converters disposed one after the other in an SCR catalytic converter system in an exhaust system, which comprises only one reduction agent dosing unit upstream of the first SCR catalytic converter, characterized in that the determination is carried out from the signal of a NOx sensor disposed between the two SCR catalytic converters and the signal of a NOx sensor disposed downstream of the second SCR catalytic converter.

Abstract: The present invention relates to a manifold for receiving exhausts from a multi-cylindrical internal combustion engine. The internal combustion engine has such a firing order that the riser in the manifold receives exhausts from two cylinders during an overlapping stage, simultaneously via an inlet opening arranged upstream and from an inlet opening arranged downstream in the riser. The riser comprises a substantially constant cross sectional area, except in one area, which is located in a position in connection with the inlet opening arranged downstream of the two inlet openings, receiving exhausts simultaneously. Said area has a geometry facilitating receipt and flow of exhausts in the predetermined direction in the riser, on occasions when the two inlet openings receive exhausts simultaneously.

Abstract: A muffler for an exhaust system includes an exhaust gas duct pipe (20) and a wall (26). The wall (26) is connected to the exhaust gas duct pipe (20) in a first connection area (24) thereof by a thread meshing.

Abstract: A muffler includes an elongated muffler shell body with a first muffler end cap mounted on the first end of the muffler shell body in a manner defining a first muffler joint and a second muffler end cap mounted on the second end of the muffler shell body in a manner defining a second muffler joint. A louver and baffle assembly is mounted within an interior of the muffler shell body. The first end of the muffler shell body includes a first shell bead/ridge and the second end of the muffler shell body includes a second shell bead/ridge, and each of the circumferential edges of the first muffler end cap and the second muffler end cap are formed to define cap bead/ridges shaped and dimensioned for engagement with the first shell bead/ridge of the first end of the muffler shell body and the second shell bead/ridge of the second end of the muffler shell body.

Abstract: A work vehicle includes a hood, an engine, a radiator, an air cleaner, and a condenser. The hood covers an engine compartment located on a front portion of a traveling body. The engine is a drive source. The radiator supplies a coolant to the engine. The air cleaner takes in outside air and supplies the air to the engine. The condenser cools a refrigerant. In front of the radiator, the air cleaner and the condenser are disposed one above the other. The condenser is withdrawable in the left and right direction.

Abstract: An apparatus includes two pumps and a circuit-changing valve connected to two cooling circuits, with the valve being controlled by a pressure differential created by the pumps. This simplifies controls, reduces components of the pumping system, and also provides a backup pump for each system. The valve's spool is controlled so that when the first pump is started before the second pump (or it generates a higher fluid pressure), the valve causes the two pumps to be connected in a serial arrangement with fluid being pumped through the first circuit and then through the second circuit. But when the second pump is started before the first pump, the valve causes the two pumps to be connected in a parallel arrangement so that the first pump moves fluid only through the first circuit, and the second pump moves fluid only through the second circuit. The valve includes an anti-dithering device.

Abstract: The disclosure relates to a supercharged internal combustion engine with an intake system and an exhaust gas discharge system that include two turbochargers arranged in series, a turbo-generator, and an electrically-driven compressor. During engine operation with mid-to-high exhaust gas flow rates, excess exhaust gas that bypasses the high-pressure turbocharger may be directed through the turbo-generator to generate electricity that may be provided to drive the electrically-driven compressor.

Abstract: A control device for a vehicle includes an opening degree sensor to detect an opening degree of a wastegate valve disposed in a bypass passage bypassing a turbine. Circuitry is configured to stop an internal combustion engine while the vehicle is driven by a motor in a motor drive mode. The circuitry is configured to calculate a target opening degree of the wastegate valve to be larger than a maximum error between the opening degree detected by the opening degree sensor and an actual opening degree of the wastegate valve. The circuitry is configured to control the wastegate valve such that the opening degree detected by the opening degree sensor is equal to the target opening degree while the vehicle is driven in the motor drive mode.

Abstract: A turbocharger is provided with a valve body which is disposed in a suction flow path leading from an inflow port of a housing covering a turbine rotor blade to a scroll portion and composed of a single piece or multiple divided pieces to supply a fluid to the turbine rotor blade with the inner surface thereof formed using a first wall surface and a second wall surface facing the first wall surface as part thereof, extends from the upstream side to the downstream side of the flow of the fluid, is rotatably provided in the housing in a direction toward and away from the first wall surface and the second wall surface, forms an upstream-side narrowed flow path with the first wall surface therebetween at an end on the upstream side, and forms a downstream-side narrowed flow path with the second wall surface therebetween at an end on the downstream side.

Abstract: Systems, methods and apparatus for controlling operation of an engine structured to combust gaseous fuel such as a dual fuel engine, including an estimation of key parameters dependent on natural gas quality, are disclosed. The natural gas quality parameters are estimated from natural gas properties obtained from various sensed parameters associated with the engine.

Abstract: A variable compression cylinder head assembly usable with an internal combustion engine having at least one piston, the cylinder head assembly including a cylinder head housing having a combustion chamber formed therein, a compression control piston disposed within the combustion chamber, a compression head actuator coupled to the cylinder head housing, the compression head actuator including an actuator housing defining an actuator reservoir, a fluid port coupled to the actuator housing to receive a fluid, a movable force plate disposed within the actuator reservoir and coupled to the compression control piston, wherein the force plate and the compression control piston move between a first position and a second position when the fluid enters the actuator reservoir.

Abstract: Methods and systems are provided for the design and manufacture of a crankshaft of a piston internal combustion engine. In one example, a crankshaft comprises a crankshaft throw, the crankshaft throw comprising a crankpin and crank webs. The crank webs are formed asymmetrically in a region of the crankpin with respect to a plane intersecting an axis of rotation of the crankshaft and a center axis of the crankpin, such that the breaking strength of the crankshaft throw is increased at a crankshaft angle of rotation which differs from the top dead center position of a piston to which the crankpin is coupled, and at which the piston exerts a maximum combustion-induced force on the crankpin.

Abstract: A zero-emission, closed-loop and hybrid solar-produced syngas power cycle is introduced utilizing an oxygen transport reactor (OTR). The fuel is syngas produced within the cycle. The separated oxygen inside the OTR through the ion transport membrane (ITM) is used in the syngas-oxygen combustion process in the permeate side of the OTR. The combustion products in the permeate side of the OTR are CO2 and H2O. The combustion gases are used in a turbine for power production and energy utilization then a condenser is used to separate H2O from CO2. CO2 is compressed to the feed side of the OTR. H2O is evaporated after separation from CO2 and fed to the feed side of the OTR.

Abstract: Instrumented airflow path components configured to determine airflow path distortion in an airflow path of a gas turbine engine (e.g., using for propulsion of an aircraft) are provided. In one embodiment, a gas turbine engine for an aircraft can include a compressor section, a combustion section, and turbine section in series flow. The compressor section, combustion section, and turbine section define at a portion of an engine airflow path for the gas turbine engine. The gas turbine engine further includes one or more members extending at least partially into the engine airflow path of the gas turbine engine and one or more pressure sensor devices at least partially integrated into the one or more members extending at least partially into the engine airflow path. The one or more pressure sensor devices are configured to obtain measurements for determining a distortion condition for the gas turbine engine.

Abstract: Systems and methods for adjusting airflow distortion in a gas turbine engine on an aircraft. The gas turbine engine can include a compressor section, a combustion section, and a turbine section in series flow. An engine airflow can flow through the compressor section, the combustion suction, and turbine section of the gas turbine engine. In one example, a method can include determining a distortion condition associated with one or more members extending at least partially into the engine airflow path. The method can further include controlling at least one sector of a plurality of sectors of variable guide vanes positioned at least partially within the engine airflow path to adjust the distortion condition.

Abstract: A hydraulic fracturing system for fracturing a subterranean formation is disclosed. In an embodiment, the system may include a plurality of electric pumps configured to pump fluid into a wellbore associated with a well at a high pressure; at least one turbine generator electrically coupled to the plurality of electric pumps so as to generate electricity for use by the plurality of electric pumps, each turbine generator having at least one air intake channel; and an air chiller system associated with the at least one turbine generator, the air chiller system comprising: a chiller unit configured to chill a fluid; and at least one coil in fluid communication with the chiller unit and positioned adjacent to the at least one air intake channel, wherein the air chiller system is configured to increase a power output of the at least one turbine generator.

Abstract: A gas turbine engine has a main compressor section. A turbine section has a variable vane positioned upstream of a rotor blade, and the variable vane is provided with an actuator operable to control an orientation of the variable vane. A tap line taps air from the compressor section, and passes the tapped air through a cooling compressor. The cooling compressor is a fixed flow compressor. Air downstream of the cooling compressor is delivered into the turbine section.

Abstract: A cooling air system for use in a gas turbine engine includes a fuel-air heat exchanger. The fuel-air heat exchanger allows heat transfer between a flow of cooling air used to cool components of the engine and a flow of fuel used to drive the engine.

Abstract: A gas turbine engine fuel system (100) comprises: a combustor (20) comprising at least one fuel injector (106), a fuel manifold (104) configured to supply fuel to each injector (106) and a drain tank (108) in fluid communication with the fuel manifold (104). Each fuel injector (106) comprises a first check valve (132) configured to allow one-way flow from the manifold (104) to the fuel injector (106), and a second check valve (134) configured to allow one-way flow from the fuel injector (106) to the fuel manifold (104). The system (100) further comprises a vacuum generator (112) configured to selectively provide below atmospheric pressure to the drain tank (108).

Abstract: A device for integrity testing a system for rapid reactivation of a turboshaft engine of a helicopter includes a pneumatic turbine that is mechanically connected to said turboshaft engine and is supplied with gas, upon a command, by a pneumatic supply circuit such that it is possible to rotate the turboshaft engine and ensure that it is reactivated. The testing device has an apparatus configured to withdraw pressurised air from the turboshaft engine; a duct for conveying the withdrawn air to the pneumatic circuit for supplying the pneumatic turbine with gas The device further includes a sensor for determining the rotational speed of the pneumatic turbine.

Abstract: An accessory system for a gas turbine engine having a driveshaft with an axis of rotation is provided. The accessory system includes a towershaft coupled to the driveshaft and driven by the driveshaft along a towershaft axis of rotation. The accessory system also includes a shaft including a first shaft bevel gear coupled to a towershaft bevel gear. The shaft is rotatable by the towershaft along a shaft axis of rotation. The shaft axis of rotation is transverse to the towershaft axis of rotation. The accessory system includes a first accessory drive shaft having a first accessory bevel gear driven by the shaft. The accessory system also includes a second accessory drive shaft having a second accessory bevel gear driven by the shaft. A first accessory axis of rotation and a second accessory axis of rotation are substantially transverse to the shaft axis of rotation.

Abstract: A gas turbine engine includes a gear system that provides a speed reduction between a fan drive turbine and a fan rotor. Aspects of the gear system are provided with some flexibility. The fan drive turbine has a first exit area and rotates at a first speed. A second turbine section has a second exit area and rotates at a second speed, which is faster than said first speed. A performance quantity can be defined for both turbine sections as the products of the respective areas and respective speeds squared. A performance quantity ratio of the performance quantity for the fan drive turbine to the performance quantity for the second turbine section is relatively high.

Abstract: A gas turbine engine includes a gear system that provides a speed reduction between a fan drive turbine and a fan rotor. Aspects of the gear system are provided with defined flexibility. The fan drive turbine has a first exit area and rotates at a first speed. A second turbine section has a second exit area and rotates at a second speed, which is faster than said first speed. A performance quantity can be defined for both turbine sections as the products of the respective areas and respective speeds squared. A performance quantity ratio of the performance quantity for the fan drive turbine to the performance quantity for the second turbine section is between 0.5 and 1.5.

Abstract: Embodiments of the disclosure can relate to NOx measurement and turbine control. In one embodiment, a method for NOx measurement and turbine control can include receiving a signal from at least one electrochemical NOx sensor mounted in a gas flow path of a turbine. Based at least in part on the received signal, a NOx emission value associated with a gas flow in or from the turbine can be determined. Based at least in part on the determined NOx emission value, a control action for the turbine can be determined. The method further comprises facilitating the control action for the turbine.

Abstract: An inlet bleed heat system for use with a turbine assembly includes a first discharge line coupled in flow communication between a compressor and an intake manifold assembly. A first control valve that is coupled to the first discharge line and operable to control a first discharge flow through the first discharge line from the compressor to the intake manifold assembly during a first operational mode. A second discharge line that is coupled in flow communication between the compressor and the intake manifold assembly and a second control valve that is coupled to the second discharge line and operable to control a second discharge flow through the second discharge line from the compressor to the intake manifold assembly during a second operational mode.

Abstract: Methods and apparatus to adjust bleed ports on an aircraft engine are disclosed. An example method to extract bleed air from an aircraft engine includes extracting, via a plenum positioned in a compressor of the aircraft engine, bleed air from a first bleed port associated with a first stage of a compressor and a second bleed port associated with a second stage of the compressor. The plenum is configured to combine the extracted bleed air from the first and second bleed ports and fluidly couple the extracted bleed air to one or more systems of an aircraft. The method includes regulating a pressure of the extracted bleed air in the plenum by adjusting a flow of bleed air through the first bleed port via a first valve associated with the first bleed port and adjusting a flow of bleed air through the second port via a second valve associated with the second bleed port.

Abstract: A method for controlling a gas turbine engine on an aircraft in response to airflow distortion in an airflow path of the gas turbine engine is provided. In one embodiment, a method can include determining, by one or more control devices located on an aircraft, a distortion condition associated with the gas turbine engine. The method can further include determining, by the one or more control devices, a stall margin for the gas turbine engine based at least in part on the distortion condition. The method can further include determining, by the one or more control devices, an engine control parameter based at least in part on the stall margin. The method can further include controlling, by the one or more control devices, a component of the gas turbine engine based at least in part on the engine control parameter.

Abstract: There is described an oil and fuel control system and method for an engine. The system comprises an electric machine having a single rotor coupled to a dual channel stator comprising a first stator and a second stator, for operating as a motor to generate motive power; a dual channel motor drive unit coupled to the electric machine; a dual channel full authority digital engine control (FADEC) coupled to the dual channel motor drive unit; an oil delivery system comprising an oil pump and oil accessories, coupled to the single rotor of the electric machine; and a fuel delivery system comprising a fuel pump and fuel accessories, coupled to the single rotor of the electric machine.

Abstract: This invention is related to a non-contact sensor device for electric throttle, comprising a body and a cover. A drive assembly is set in the body and has a shaft corresponded to the on/off state of a throttle valve. An adaptor is installed on the shaft, and a magnet element is set on the adaptor. A Hall element is set on the cover to correspond to the magnet element for detecting the rotation angle of the shaft, thereby knowing the air inflow value and the open angle of the throttle valve to control the fuel injection of fuel-air mixture.

Abstract: A method for operating a system having a plurality of internal combustion engines coupled together such that then outputs are drawn off by a common load, a downstream individual exhaust gas aftertreatment device, in which the exhaust gas of a particular engine undergoes an individual exhaust gas aftertreatment, positioned downstream of each engine, or a common exhaust gas aftertreatment device, in which the exhaust gas undergoes a common exhaust gas aftertreatment, positioned downstream of to the engine. To regenerate an exhaust gas aftertreatment device, the drive output of one engine is reduced, the temperature of the exhaust gas is increased, and the drive output of a second engine is increased such that the drive output reduction is at least partially compensated for.

Abstract: A method of operating an internal combustion engine, and more particularly a fuel injector is disclosed. The fuel injector is commanded to inject a fuel requested quantity. The fuel requested quantity is adjusted by closed-loop for controlling an engine speed to match a target value thereof. A value of a first parameter indicative of an amount of electrical energy supplied to an electric battery by an electric generator coupled to the internal combustion engine is measured. A value of a voltage generated by the electric battery and a value of the engine speed are measured. A reference value of the fuel requested quantity is calculated on the basis of the voltage value, the engine speed value and the value of the first parameter. A difference between the value of the adjusted fuel requested quantity and the reference value is calculated and used to control the internal combustion engine.

Abstract: A method and system of periodically cycling an air shutoff valve, upon a pre-determined length of time elapsing since the last valve cycle; or upon the cumulative run time of an engine since the last valve cycle exceeding a pre-determined value.

Abstract: An engine system incorporating an engine, one or more sensors, and a controller. The controller may be connected to the one or more sensors and the engine. The one or more sensors may be configured to sense one or more parameters related to operation of the engine. The controller may incorporate an air-path state estimator configured to estimate one or more air-path state parameters in the engine based on values of one or more parameters sensed by the sensors. The controller may have an on-line and an off-line portion, where the on-line portion may incorporate the air-path state estimator and the off-line portion may configure and/or calibrate a model for the air-path state estimator.

Abstract: A control device for an internal-combustion engine includes circuitry. The circuitry is configured to calculate, in accordance with an operating state of the internal-combustion engine, a basic supercharging pressure of intake gas generated by a supercharger provided in the internal-combustion engine. The circuitry is configured to acquire a flow rate change state parameter that correlates with a change state of the flow rate of the intake gas controlled by a flow rate control mechanism provided in the internal-combustion engine. The circuitry is configured to calculate a correction value in accordance with the flow rate change state parameter. The circuitry is configured to calculate an estimated supercharging pressure of the intake gas by correcting the basic supercharging pressure with the correction value. The circuitry is configured to control operation of the internal-combustion engine using the estimated supercharging pressure.

Abstract: Methods, systems, and apparatus for acceleration event prediction. A system includes one or more external databases connected through a network to a vehicle. The vehicle includes a navigation unit, one or more sensors and an electronic control unit coupled to at least the navigation unit and the one or more sensors. The electronic control unit is configured to obtain navigational map information and vehicle information, determine a predicted route set including a destination location based on the the navigational map information and the vehicle information, determine one or more predicted acceleration events for the predicted route set, detect a respective acceleration event of the one or more predicted acceleration events based on the predicted route set and a first location of the vehicle and send or transmit a signal to a turbocharger that is coupled to an engine to prepare for the respective acceleration event.

Abstract: A method, a combustion engine controller, and a combustion engine incorporating the controller to implement the method are provided. The method includes determining a first dedicated exhaust gas recirculation (D-EGR) cylinder parameter value of a first D-EGR cylinder parameter associated with a first D-EGR cylinder of the combustion engine; and regenerating the first D-EGR cylinder responsive to the first D-EGR cylinder parameter value satisfying a threshold indicative of a carbon build-up level.

Abstract: A control system and a control method for an internal combustion engine, which are capable of accurately calculating an in-cylinder gas amount and an EGR ratio by a relatively simple method even in a case where an in-cylinder gas temperature is changed by execution of internal EGR, and properly controlling the engine using the EGR ratio thus calculated. An in-cylinder gas amount Gact actually filled in the cylinder is calculated by correcting an ideal in-cylinder gas amount Gth, which is an amount of gases filled in a cylinder in an ideal state in which it is assumed that no exhaust gases of the engine are recirculated into the cylinder, using an ideal in-cylinder gas temperature Tcylth according to an in-cylinder gas temperature Tcyl, and an EGR ratio REGRT is calculated using the in-cylinder gas amount Gact and an intake air amount Gaircyl.

Abstract: Methods and systems are provided for exhaust gas heat recovery at a split exhaust gas heat exchanger. Exhaust gas may flow in both directions through an exhaust bypass passage and the heat exchanger coupled to the bypass passage. Warm or cold EGR may be delivered from the exhaust passage to the engine intake manifold and heat from the exhaust gas may be recovered at the heat exchanger.

Abstract: Internal combustion engine having cam actuated valves that can be controlled to facilitate the use of different air charge levels in different cylinders or sets of cylinders are described. In one aspect a first set of cylinders is operated in a skip fire manner in which the corresponding cylinders are deactivated during skipped working cycles. Cam actuated intake valves associated with a second set of cylinders are operated differently so that the air charge in the cylinders in the second set is different than the air charge in fired cylinders subject to the skip fire control. According to another aspect, an engine having cam actuated intake valves is operated in a dynamic firing level modulation mode. During the dynamic firing level modulation operation, the cam actuated intake valves are controlled in at least two different manners to such that different cylinder working cycles have different air charges.

Abstract: In one aspect, a method for controlling operation of an internal combustion engine is described. The engine is operated in a skip fire manner such that selected skipped working cycles are skipped and selected active working cycles are fired to deliver a desired engine output. A particular level of torque output is selected for each of the fired working chambers. Various methods, arrangements and systems related to the above method are also described.

Abstract: An internal combustion engine comprises: an exhaust purification catalyst; a downstream side air-fuel ratio sensor which is arranged at a downstream side of the exhaust purification catalyst; and an air-fuel ratio control system which performs feedback control so that the air-fuel ratio of the exhaust gas flowing into the exhaust purification catalyst becomes a target air-fuel ratio.

Abstract: A method for operating a transmission device and a transmission with at least one oil chamber, in which is arranged a wheelset of the transmission device. At the same time, in order to determine the temperature in the oil chamber, an overall level is determined for the oil chamber, wherein an initial value is determined from the overall energy level at the start of the operation of the transmission device with the following steps: determination of a standardized shutdown time as a function of an external temperature and of the overall energy level that is present with the shutdown of the transmission device, determination of a corrected shutdown time as a function of the standardized shutdown time and a measured shutdown time, and determination of the initial value as a function of the corrected shutdown time and of the momentary external temperature.

Abstract: A system according to the principles of the present disclosure includes an engine stall module and an actuator control module. The engine stall module identifies a potential engine stall based on a speed of an engine and a rate of change in the engine speed. The actuator control module selectively adjusts an actuator of a powertrain system to prevent the engine from stalling when a potential engine stall is identified.

Abstract: A method and apparatus to assist a vehicle ascending a hill are disclosed. An example apparatus includes a trailer connection component configured to determine whether a trailer is connected to the vehicle. The example apparatus also includes a road geometry component configured to determine a slope of a road on which the vehicle is driving. The example apparatus also includes a vehicle payload component configured to determine a gross vehicle weight of the vehicle. The example apparatus also includes a throttle adjuster configured to adjust a throttle based on the gross vehicle weight to maintain a set speed.

Abstract: A mass air flow measurement apparatus for an internal combustion engine includes: a plurality of pressure sensors disposed at different locations along an air intake path of the internal combustion engine, each pressure sensor adapted to sense a pressure of air flowing into the internal combustion engine and output an electrical signal as a pressure signal corresponding to the sensed air pressure; a carburetor having a plurality of booster venturis, the carburetor rendered permanently inoperable to mix fuel with air flowing in the air intake path, a body of the carburetor configured to accept one or more of the plurality of pressure sensors for each of the plurality of booster venturis; and a calculation section that receives the pressure signals and generates a mass air flow signal as an output signal to an engine management system to control an electronic fuel injection system based on the received pressure signals.

Abstract: The present disclosure relates to internal combustion engines and the teachings thereof may be embodied in methods and apparatus for detecting a malfunctioning rail pressure sensor. Some embodiments may include a method for detecting a malfunctioning rail pressure sensor comprising: delivering an analog output signal characterizing the rail pressure to a control unit; generating a differential rail pressure signal as a digital output signal; delivering the differential rail pressure signal of the rail pressure sensor to the control unit; analyzing the analog output signal and the differential rail pressure signal in the control unit; and detecting a malfunctioning rail pressure sensor based on the analysis by the control unit.

Abstract: The internal combustion engine comprises an exhaust purification catalyst able to store oxygen, and a downstream side air-fuel ratio sensor arranged at a downstream side of the exhaust purification catalyst in a direction of exhaust flow. The control system performs feedback control of an amount of fuel fed to a combustion chamber of the internal combustion engine so that an air-fuel ratio of exhaust gas flowing into the exhaust purification catalyst becomes a target air-fuel ratio and performs learning control to correct a parameter relating to the feedback control based on an air-fuel ratio of exhaust gas detected by the downstream side air-fuel ratio sensor. The target air-fuel ratio is alternately switched between a rich set air-fuel ratio and a lean set air-fuel ratio leaner. When a condition for learning acceleration, which is satisfied when it is necessary to accelerate correction of the parameter by the learning control, is satisfied, a rich degree of the rich set air-fuel ratio is increased.

Abstract: A fuel supply device according to the present invention comprises a first fuel pump for forcing fuel from a fuel tank to a fuel passage, a first electric motor for driving the first fuel pump, a second fuel pump for forcing fuel from the fuel tank to the fuel passage, a second electric motor for driving the second fuel pump, a supply flow rate sensor for detecting flow rate in the supply passage, and a control device for controlling the flow rate in the supply passage to follow a desired value thereof, by regulating rotational speeds of the first and second electric motors depending on a difference between the desired value and a detected value of flow rate in the supply passage.