Abstract: A air-fuel ratio control apparatus, applied to an internal combustion engine having a catalyst disposed in an exhaust passage of the engine, includes a downstream air-fuel ratio sensor (oxygen concentration cell type oxygen concentration sensor) disposed at a position downstream of the catalyst, and air-fuel ratio control means for controlling, based on an output value of the downstream air-fuel ratio sensor, an air-fuel ratio of a mixture supplied to the engine so as to change an air-fuel ratio of a catalyst inflow gas. Further, the air-fuel ratio control means controls the air-fuel ratio of the mixture supplied to the engine.

Abstract: To provide a control system for an internal combustion engine, which is capable of providing a stable intake air amount through reduction of pumping loss and blow-back of combustion gases by appropriately controlling the valve-opening timing of the intake valves, and thereby being capable of securing excellent drivability. In the control system 1, the valve-closing timing of the exhaust valve 9 is changed by an exhaust-side variable valve-operating mechanism 60, whereby the internal EGR amount is controlled, and the valve-opening timing of an intake valve 8 of an internal combustion engine 3 is changed by an intake-side variable valve-operating mechanism 40.

Abstract: A method includes combusting air within a plurality of cylinders of an internal combustion engine by injecting a fuel into the plurality of cylinders. The method further includes expanding a first portion of an exhaust gas generated from the plurality of combustion cylinders via a turbine. The method further includes controlling at least one of feeding a second portion of the exhaust gas via an exhaust channel bypassing the turbine; and recirculating a third portion of the exhaust gas to the plurality of combustion cylinders via a recirculation channel, as a function of an intake manifold air temperature and pressure at which the engine is operated.

Abstract: An exhaust gas recirculation device of an internal combustion engine (1) including a low-pressure EGR passage (20), a high-pressure EGR passage (21), a low-pressure EGR valve (23) and a high-pressure EGR valve (24) further includes an air-fuel ratio sensor (12) that is disposed in the exhaust passage (4) upstream of the position of its connection with the low-pressure EGR passage (20). In the case where a predetermined fuel-cut condition is satisfied, an ECU (30) estimates the flow amounts of exhaust gas flowing in the low-pressure EGR passage (20) and the high-pressure EGR passage (21), on the basis of the oxygen concentrations acquired by the air-fuel ratio sensor (12) at timings at which the exhaust gases recirculated into the intake passage (3) via the low-pressure EGR passage (20) and via the high-pressure EGR passage (21) reach the air-fuel ratio sensor (12), respectively.

Abstract: A vehicle includes an internal combustion engine, an air-fuel ratio sensor provided in an exhaust passage of the internal combustion engine, and a controller. The controller is configured to diagnose a responsiveness of the air-fuel ratio sensor on the basis of an output voltage of the air-fuel ratio sensor in a predefined period. The period is a period over which exhaust gas goes through the air-fuel ratio sensor during the internal combustion engine is rotating without fuel injection.

Abstract: The present invention relates to a method for adjusting a mass flow of an exhaust gas return of an internal combustion engine, taking into consideration a NOx behavior, wherein a controlling system provides a coupling of a virtual NOx determination with a real NOx control. Furthermore, an internal combustion engine with appropriate controlling means is proposed.

Abstract: A closed-loop system having a controllable variable is monitored to detect the off-nominal behavior and raise an alert when fault is detected. The faults show up in such a way that the tracking error signal is impacted and this impact manifests itself as a change in the frequency components. A filter isolates a band of frequency components of the tracking error signal that are more impacted than others by deviation caused by a fault to be detected. The filter can effectively amplify the section of the error tracking signal that contains the frequency components having impact. In addition, the filter will also have the characteristics to attenuate the impact of other frequency components. An accumulated error signal is generated from the filtered tracking error signal, compared with a predetermined fault threshold characteristic, and a fault alert is provided if a predetermined threshold is satisfied.

Abstract: Various embodiments related to controlling EGR in an engine are disclosed. In one embodiment, a first EGR amount is supplied to a cylinder at a first temperature and a first engine speed and load. Further, at the first engine speed and load, as engine temperature increases from the first temperature to a second temperature, a first fuel amount is injected after exhaust valve closing and before intake valve opening while a second EGR amount is supplied to the cylinder that is greater than the first EGR amount.

Abstract: Methods and systems are provided for draining water separated from diesel fuel into an EGR system. In response to the water volume in the fuel system and EGR flow at pre-determined levels, water may be introduced into the EGR system. EGR flow may also be controlled in response to introducing water into the EGR system and engine operating conditions.

Abstract: This disclosure provides a method of controlling a diesel engine, which includes executing a premix combustion pattern fuel injection containing one or more injections at a first timing, while introducing an amount of EGR gas according to an operating condition of the engine into a cylinder, when an engine load is low, to operate in a premix combustion mode, executing a diffusion combustion pattern fuel injection containing one or more injections at a second timing that is later than the first timing, when the engine load is high, to operate in a diffusion combustion mode, and executing a diffusion combustion pattern fuel injection at a third timing that is later than the second timing, while introducing the amount of EGR gas according to the operating condition of the engine into the cylinder, when shifting from the diffusion combustion mode to the premix combustion mode with a decrease in engine load.

Abstract: Various methods and systems are provided for lowering exhaust gas temperature. In one embodiment, a method comprises increasing an air-to-fuel ratio of an engine in response to an exhaust gas temperature exceeding a threshold temperature value to lower the exhaust gas temperature to a temperature below the threshold temperature value.

Abstract: A control apparatus for an internal combustion engine includes phase change means (60) for advancing or retarding phases of an opening timing and a closing timing of an intake valve (62); duration change means (60) for increasing or decreasing a duration of the intake valve (62); and EGR gas amount increase means (50) for increasing an amount of EGR gas, based on an operating state of an internal combustion engine. The control apparatus further includes intake-valve closing timing advancing means (50) for advancing the intake-valve closing timing when the amount of EGR gas is increased. The intake-valve closing timing advancing means (50) advances the intake-valve closing timing by performing a first operation that advances the phases using the phase change means (60), and performing a second operation that decreases the duration using the duration change means (60), and makes a timing at which the second operation is started later than a timing at which the first operation is started.

Abstract: Methods and systems are provided for operating a turbocharged engine including a particulate filter positioned upstream of a turbocharger turbine, a catalyst positioned downstream of the turbine, and an EGR passage coupled between an engine exhaust and engine intake. In one example, the method comprises, diverting exhaust gas from downstream of the filter to the engine intake via the EGR passage, and adjusting an amount of diverted exhaust gas based on filter operating conditions.

Abstract: A control apparatus for an internal combustion engine is provided that can successfully achieve a desired acceleration by avoiding an absence of torque of the internal combustion engine due to an influence of EGR gas when the torque increases toward a required torque. A required throttle valve opening degree TAreq is set based on a required torque TQreq in accordance with a required throttle valve opening degree map that defines a relation between the required torque TQreq and the required throttle valve opening degree TAreq. In addition, a required EGR valve opening degree EGRreq is set based on a required load factor KLreq in accordance with a required EGR valve opening degree map that defines a relation between the required load factor KLreq and the required EGR valve opening degree EGRreq.

Abstract: In a method for controlling operation of an engine in which an EGR system is incorporated therein, when the engine is in a pressure-accumulable operational state in which EGR gas can be pressure-accumulated in an EGR passage between an EGR control valve and an on-off valve, these valves are brought into a full closed state, respectively. In addition, when an intake pressure transmitted from an air intake passage to the engine becomes more than or equal to a target value of the intake pressure set based on an operational state of the engine, the on-off valve is switched to a full open state, and then the on-off valve is switched to the full closed state again after elapse of a predetermined time, and high-pressure EGR gas of a low oxygen concentration is temporarily stored in the EGR passage.

Abstract: Methods and systems are provided for detecting hydrocarbon ingestion into an engine based on the simultaneous monitoring of cylinder imbalance and an elevated exhaust exotherm. Crankshaft acceleration data is monitored during steady-state and transient engine conditions while exhaust temperatures are estimated during non-regeneration conditions. Engine speed and load is limited to reduce further hydrocarbon ingestion.

Abstract: A method to operate an electronic controlled internal combustion engine to perform on board NOx emissions level diagnostics. In one embodiment, the method may include operating the engine to maintain a predetermined temperature for a predetermined period of time, determining whether the engine operating status is stable for one of cruise control, idle engine speed, engine torque, or high idle regeneration for a predetermined period of time, cycling the EGR valve between a first position for a predetermined period of time and then in a second position for a predetermined period of time, a determining a change in engine out NOx levels to determine whether an engine component or system is malfunctioning.

Abstract: A method to control an exhaust gas recirculation and a manifold air pressure in an engine includes utilizing a decoupling matrix within a multiple input and multiple output controller to determine an exhaust gas recirculation command and a manifold air pressure command, wherein the decoupling matrix is configured based upon a diagonally dominant model of the engine compensated by the determined exhaust gas recirculation command and the manifold air pressure command. The exhaust gas recirculation and manifold air pressure are controlled based upon the determined exhaust gas recirculation command and the determined manifold air pressure command.

Abstract: A method includes substantially reducing specific fuel consumption and exhaust emissions of an engine by adjusting an exhaust flow from a set of predetermined cylinders among a plurality of cylinders of the engine through an exhaust gas recirculation system to an intake manifold, by adjusting a temperature of a cooler of the exhaust gas recirculation system, and by adjusting a fuel injection timing, in response to variance in a plurality of parameters of the engine.

Abstract: Methods and systems are provided for adjusting cylinder valve timings to enable a group of cylinders to operate and combust while another group of cylinders on a second are selectively deactivated. Valve timing may be adjusted to allow flow of air through the inactive cylinders to be reduced, lowering catalyst regeneration requirements upon reactivation. The valve timing may alternatively be adjusted to enable exhaust gas to be recirculated to the active cylinders via the inactive cylinders, providing cooled EGR benefits.

Abstract: A method of controlling engine internal exhaust gas recirculation may include estimating a flow restriction through a diesel particulate filter in an exhaust system of an engine assembly and adjusting a backpressure control valve in the exhaust system downstream of the diesel particulate filter based on the flow restriction. A controlled amount of internal exhaust gas recirculation may be provided to the engine assembly based on adjusting the backpressure control valve.

Abstract: The invention relates to an air-fuel ratio control device of an internal combustion engine, comprising a plurality of means for independently introducing into each combustion chamber an exhaust gas discharged from combustion chambers to an exhaust passage. When at least one exhaust gas introduction means is under an exhaust gas introduction shortage state, a target value of an air-fuel ratio of a mixture gas is changed depending on whether an exhaust gas introduction control for introducing the exhaust gas into the combustion chamber by the exhaust gas introduction means is performed.

Abstract: An engine control system and method for determining if an exhaust gas recirculation EGR runner between an EGR valve and a cylinder inlet is obstructed using a single exhaust gas sensor and individual cylinder fuel control (ICFC). A controller determines an off-state value based on an off-state air/fuel combustion ratio of a particular cylinder indicated by the single exhaust gas sensor while the EGR valve is operated to the off-state and while the engine is operating at a first speed-load condition, and determines an on-state value based on an on-state air/fuel combustion ratio of the particular cylinder indicated by the single exhaust gas sensor while the EGR valve is operated to the on-state and while the engine is operating at a second speed-load condition. The controller then determines if the EGR runner associated with the particular cylinder is obstructed based on the off-state value and the on-state value.

Abstract: An engine control system for an engine equipped with a catalyst that purifies exhaust gas includes: a catalyst temperature acquisition section that acquires the temperature of the catalyst; and a control section that controls an engine such that a rate of increase in engine output speed is changed in accordance with the temperature of the catalyst.

Abstract: Methods and products for controlling exhaust gas recirculation.

Abstract: A method for controlling charge flow in an internal combustion engine includes operating an engine having a VGT. The method includes determining a target and current charge flow and EGR flow. The method further includes determining an error term for the charge flow and the EGR flow, and determining an exhaust pressure feedback command in response to the error terms. The exhaust pressure feedback command is combined with an exhaust pressure feedforward command, and the VGT is controlled in response to the exhaust pressure feedback command. The method additionally includes determining the exhaust pressure feedback command in response to a current EGR valve position. The method further includes controlling an EGR flow rate with the EGR valve at relatively closed EGR valve positions, and controlling the EGR flow rate with exhaust pressure at relatively open EGR valve positions.

Abstract: A waste heat recovering and cooling apparatus for an engine includes a water pump that ejects cooling water of an engine; an EGR cooler that cools EGR gas introduced into an intake pipe from an exhaust pipe of the engine by using some of the cooling water ejected from the water pump; an EGR valve that opens and closes the channel of the EGR gas passing through the EGR cooler; and a transmission warmer that heats lubricating oil of a transmission by the cooling water passing through the EGR cooler.

Abstract: After completion of warm-up of an engine, upon satisfaction of an exhaust gas recirculation condition by setting the drive mode of a hybrid vehicle to a normal mode according to the driver's accelerator operation, when a power difference ?Pe representing a decrease rate of a power demand Pe* required for the engine is less than a preset reference value ?, the engine and motors MG1 and MG2 are controlled to ensure output of a power equivalent to the power demand Pe* from the engine with prohibition for exhaust gas recirculation via an EGR valve and to ensure output of a torque equivalent to a torque demand Tr* to a ring gear shaft or an axle (steps S300 to S330 and step S390).

Abstract: A dynamic feedforward amount to realize a predetermined transient response characteristic by compensating a transient response characteristic of an engine having a Variable Nozzle Turbo (VNT) and an Exhaust Gas Recirculator (EGR) is calculated for a nozzle opening degree of the VNT and a valve opening degree of the EGR. The transient response characteristic of the engine responds to a setting value of an injection quantity or the like. Then, command values of the nozzle opening degree of the VNT and the valve opening degree of the EGR are calculated by using the dynamic feedforward amount. In the transient state, the followingness to the target value is improved.

Abstract: A spark ignition type internal combustion engine of the present invention comprises a variable closing timing mechanism able to change a closing timing of an intake valve after intake bottom dead center and an EGR mechanism making a part of the exhaust gas flow again into a combustion chamber as EGR gas. The EGR mechanism is controlled so that the amount of EGR gas is reduced when the closing timing of the intake valve is at a retarded side, compared with when it is at an advanced side. Due to this, occurrence of variation among cylinders in the air-fuel ratio and intake resistance along with blowback of intake gas can be suppressed.

Abstract: A method for the adaptive lambda control of an internal combustion engine involves a controller limiting lambda control by a maximum control stroke. A lambda variable is a controlled variable, a metering variable of a metering device is a manipulated variable, and a lambda setpoint variable is a setpoint variable. In addition, an adapter carries out a lambda adaptation, which is limited by a maximum adaptation speed. A control speed of the lambda control is greater than the maximum adaptation speed. The maximum control stroke and/or the maximum adaptation speed is/are a function of a deviation of the lambda variable from the lambda setpoint value.

Abstract: An EGR device for an internal combustion engine returns an EGR gas from an exhaust passage to an intake passage of an engine. The EGR device is configured to determine a target EGR ratio from an engine rotation number and an engine load and calculate an estimate EGR ratio from an intake air amount to the engine and a cylinder intake gas amount to detect a response delay of the EGR gas from a difference between the target and estimate EGR ratios.

Abstract: An automobile-mount diesel engine with a turbocharger is provided, which includes an engine body with the turbocharger, the engine body being mounted in the automobile and supplied with fuel containing diesel fuel as its main component, a fuel injection valve arranged in the engine body so as to be oriented toward a cylinder of the engine body and for directly injecting the fuel into the cylinder, an injection control module for controlling a mode of injecting the fuel into the cylinder through the fuel injection valve, and an EGR amount control module for adjusting an amount of EGR gas introduced into the cylinder. EGR and fuel injection are adjusted based on speed-load conditions of the engine.

Abstract: One embodiment may include a method of controlling exhaust gas recirculation (EGR) in a turbocharged compression-ignition engine system including a high pressure (HP) EGR path and a low pressure (LP) EGR path. The method may include determining a target total EGR fraction for compliance with exhaust emissions criteria, and determining a target HP/LP EGR ratio to optimize other engine system criteria within the constraints of the determined target total EGR fraction. The determining of the target HP/LP EGR ratio may include using at least engine speed and load as input to a base model to output a base EGR value, using at least one other engine system parameter as input to at least one adjustment model to output at least one EGR adjustment value, and adjusting the base EGR value with the at least one EGR adjustment value to generate at least one adjusted EGR value.

Abstract: An intake system for an internal combustion engine comprises an exhaust driven turbocharger configured to deliver compressed intake charge, comprising exhaust gas from the exhaust system and ambient air, through an intake charge conduit and to cylinders of the internal combustion engine. An intake charge cooler is in fluid communication with the intake charge conduit. A cooling system, independent of the cooling system for the internal combustion engine, is in fluid communication with the intake charge cooler through a cooling system conduit. A coolant pump delivers a low temperature cooling medium from the cooling system to and through the intake charge cooler for the transfer of heat from the compressed intake charge thereto. A low temperature cooler receives the heated cooling medium through the cooling system conduit for the transfer of heat therefrom.

Abstract: A communication system for a vehicle includes: a plurality of controllers mounted on the vehicle; a data communication network for coupling the plurality of controllers with each other so that the controllers transmit data to and receive data from each other via the data communication network; a failure diagnosis device for diagnosing whether each controller is normal; a failure diagnosis activation device for activating the failure diagnosis device; and an avoiding condition setting device for setting an avoiding condition, which provides to avoid execution of the failure diagnosis when the failure diagnosis device is activated.

Abstract: An intake system for an internal combustion engine includes an intake passage connected with an intake port of the internal combustion engine; an EGR passage merged with the intake passage at a junction portion; a gas sensor attached to the intake passage and configured to detect a concentration of specific gas; and a control section configured to control the internal combustion engine on the basis of an output signal of the gas sensor. A diameter-enlarged portion having an inner diameter larger than an inner diameter of the junction portion is formed at a portion of the intake passage which is located on a downstream side of the junction portion. The gas sensor is located downstream from the diameter-enlarged portion.

Abstract: A method of stoichiometrically operating a diesel-fueled internal combustion engine. A control unit is provide with stored data representing, within a range of exhaust valve timing or event modifications, an amount of fresh air flow and exhaust gas residuals resulting from each modification. During operation of the engine, the control unit is used to determine a desired amount of exhaust gas residuals for a given engine load; to access the stored data to determine a modification that will provide the desired amount of exhaust gas residuals; and to generate a control signal that will result in the desired modification.

Abstract: Provided are an apparatus and method for preventing the inflow of exhaust gas of a vehicle. The apparatus includes a mode door provided in an air conditioner of a vehicle in such a manner as to close an air inlet, being in air-close mode, so that only inside air is circulated, or to open the air inlet, being in air-open mode, so that outer air is introduced, and a controller designed, in the air-close mode and above a certain vehicle speed, to control the mode door to tilt and open at a certain angle towards the air-open mode.

Abstract: A control system includes an error module, a selection module, a control module, and a hysteresis module. The error module determines an error value based on a difference between a desired position and a measured position of one of a throttle valve and an exhaust gas recirculation (EGR) valve of a vehicle. The selection module sets a control value equal to one of the error value and zero based on a comparison of the error value and a hysteresis value. The control module generates a control signal based on the desired position and the control value and actuates the one of the throttle valve and the EGR valve using the control signal. The hysteresis module selectively varies the hysteresis value.

Abstract: A method of controlling a charging pressure of an internal combustion engine having a particle filter for the treatment of exhaust gases, wherein the charging pressure is controlled to achieve a nominal charging pressure value and wherein the nominal charging pressure value is set as a function of operating parameters, wherein there is determined a first value for a charging pressure minimising a fuel consumption, taking into account a direct influence of the charging pressure on the fuel consumption of an internal combustion engine; as well as an internal combustion engine having a particle filter for the treatment of exhaust gases, using such a control method.

Abstract: A controller includes an exhaust gas recirculation (EGR) system for performing EGR control, the system including an EGR passage for recirculating exhaust gas per cylinder and an EGR device for controlling a flow rate of the exhaust gas to be recirculated. The controller is arranged to perform internal combustion engine by learning control of an air-fuel ratio (A/F) during the EGR control. This controller includes a blocking determination section including first and second determination sections to determine blocking of the EGR passage in a specified cylinder. The blocking determination section is configured so that the first determination section makes preliminary determination of blocking of the EGR passage and the second determination section makes main determination of blocking of the EGR passage.

Abstract: Method for controlling the power plant of a motor vehicle with partial exhaust gas recirculation in which the fresh air flow rate and the partially recirculated gases flow rate are regulated either on a rich mixture control structure or on a lean mixture control structure and in which the flow rates are set, on the rich mixture control structure, to the setpoint values equal to the flow rate setpoint values of the lean mixture control structure during a transition from a rich mixture control structure to a lean mixture control structure.

Abstract: A method for controlling emissions in the exhaust gas of a diesel engine, the engine having an exhaust gas recirculation (EGR) system. The engine's exhaust aftertreatment system need have only an oxidation catalyst and a particulate filter (with no NOx reduction or adsorption device). In “normal” engine conditions, the engine is operated with a lean air-fuel ratio, with “normal” engine conditions being engine conditions other than transient load increase engine conditions. Also, during normal engine conditions, the EGR system is used to reduce engine-out NOx. During transient load increase engine conditions, the engine is operated stoichiometrically or near stoichiometrically and the use of EGR is interrupted.

Abstract: This disclosure provides a thermal management system and method that can recommend operational behavior to an operator of an engine system to optimize fuel economy over a period of time in which a components of the engine system is in a warm up and/or regeneration state. In one representative embodiment, the expected temperature change of the engine component at a later time is determined based on inefficient operation of the engine, such as a transmission down shift resulting in higher engine speed and lower engine torque, and the expected temperature change of the engine component resulting from operating the engine under current conditions or expected conditions at that later time is determined. A determination is made as to whether the inefficient engine operation is the optimal operation in view of fuel economy and a recommendation is generated for the operator based if optimal operation is determined.

Abstract: A system for controlling a diesel internal combustion engine including a circuit for partially recirculating exhaust gases, including a mechanism estimating set values of intake-air parameters; a mechanism estimating richness of the exhaust gas; a mechanism determining a set value of the intake richness according to set values of the intake-air parameters; and a mechanism correcting at least one of the set values of the intake-air parameters according to the estimation of the richness of the exhaust gas and the richness set value.

Abstract: Methods and systems are provided for controlling exhaust emissions by adjusting a fuel injection into an engine cylinder from a plurality of fuel injectors based on the fuel type of the injected fuel and further based on the soot load of the engine. Soot generated from direct fuel injection is reduced by decreasing an amount of direct injection into a cylinder as the engine soot load increases.

Abstract: A fuel control system of an engine system comprises a pre-catalyst exhaust gas oxygen (EGO) sensor, a setpoint generator module, a sensor offset module, and a control module. The pre-catalyst EGO sensor generates a pre-catalyst EGO signal based on an air-fuel ratio of an exhaust gas. The setpoint generator module generates a desired pre-catalyst equivalence ratio (EQR) signal based on a desired EQR of the exhaust gas. The sensor offset module determines an offset value of the pre-catalyst EGO sensor. The control module generates an expected pre-catalyst EGO signal based on the desired pre-catalyst EQR signal and the offset value.

Abstract: Embodiments for estimating intake air humidity in an engine are provided. In one example, an engine method comprises adjusting an engine parameter in response to intake air humidity estimated based on a concentration of one or more engine-out emissions. In this way, one or more exhaust emission sensors may be used to estimate intake air humidity.

Abstract: An exhaust gas recirculation device of an engine (10) of the invention comprises a first exhaust gas recirculation passage (50) for connecting an exhaust passage (40) and an intake passage (30) to each other and introducing into the intake passage an exhaust gas discharged from a combustion chamber (21) to the exhaust passage, and a second exhaust gas recirculation passage (55) for connecting the exhaust passage upstream of a part of the exhaust passage connected to the first exhaust gas recirculation passage and the intake passage downstream of a part of the intake passage connected to the first exhaust gas recirculation passage to each other and introducing into the intake passage the exhaust gas discharged from the combustion chamber to the exhaust passage.