Abstract: A control system for an internal combustion engine, which is capable of properly controlling both the temperature of an exhaust system and the air-fuel ratio of exhaust gases even when the control range of the air-fuel ratio of a combustion air-fuel mixture is limited, thereby improving the reduction of exhaust emissions. In the control system, a demanded torque-calculating section calculates a demanded torque. A first controller calculates a target equivalent ratio such that a DeNOx catalyst temperature converges to a predetermined target temperature. A second controller calculates three feedback correction values such that an output value from an oxygen concentration sensor converges to a target output value. A third controller calculates a torque fuel injection amount for generating the combustion air-fuel mixture, a post fuel injection amount for supplying unburned fuel to a DeNOx catalyst, etc. based on five values.

Abstract: An exemplary method of controlling an internal combustion engine system is described herein. The internal combustion engine system includes an internal combustion engine, a valve driving mechanism which reciprocally drives an intake valve and an exhaust valve for a combustion chamber of the internal combustion engine, a turbocharger including a turbine and a compressor, and a first EGR passage which communicates an exhaust passage downstream of the emission control device and an intake passage upstream of the compressor. The exemplary method includes shutting off supplying fuel to the combustion chamber under a predetermined condition, and decreasing a lift of the intake or exhaust valve for the combustion chamber during the shutting off supplying fuel to the combustion chamber compared to in a case of supplying fuel to said combustion chamber.

Abstract: A system and method are provided for controlling a flow of intake air entering an internal combustion engine. At least some of the intake air is diverted away from the engine in response to detection of a first operating condition that is indicative of a minimum engine fueling rate. A second operating condition that is indicative of a flow rate of the intake air entering the engine is monitored, and diverting at least some of the intake air away from the engine is discontinued if the second operating condition indicates that the flow rate of the intake air entering the engine is within a threshold value of a target flow rate.

Abstract: A method and apparatus are provided for controlling combustion in a pilot ignition gas engine connected to an electric generator of a power generator unit installed near a coal mine. The engine utilizes recovered methane gas and ventilation air methane gas from the coal mine by adjusting methane concentration to produce a lean air-methane gas mixture. Gas engine output torque is controlled to maintain |?Td|?|?Ts|>0, where |?Td| is the absolute value of change rate of load torque Td required to drive the generator in relation to engine rotation speed, and |?Ts| is the absolute value of change rate of output torque Ts in relation to engine rotation speed at an intersection of torque curves. Excess air ratio is controlled to be 2 or larger so that lean mixture burning is performed while avoiding misfiring and knocking by controlling the mixing ratio of recovered methane gas with ventilation air methane.

Abstract: The ratio between the amount of exhaust gas recirculated by a high-pressure EGR device and the amount of exhaust gas recirculated by a low-pressure EGR device (mixture ratio) is controlled based on the operating state of an internal combustion engine and the correlation between the fuel consumption rate of the internal combustion engine and the mixture ratio. Thus, high-pressure EGR and low-pressure EGR are performed at the mixture ratio (optimum mixture ratio) at which the fuel consumption rate is at or around the minimum value.

Abstract: An internal combustion engine is provided in which a prescribed amount of fuel is injected over a predetermined period until an air-fuel ratio sensor is activated when fuel cut control of the internal combustion engine is stopped to resume normal engine operation. If an EGR gas is inducted immediately before the fuel cut control is started, the prescribed amount is reduced.

Abstract: In a hybrid electric vehicle powered by an internal combustion engine that produces torque and an electric machine that produces torque, a method for operating the electric machine to produce electric assist to the engine includes determining a magnitude of power requested by the vehicle operator, determining a minimum power limit and a maximum power limit of the engine that will produce a response to a torque request within a desired period following the torque request, using the magnitude of power requested, the minimum and maximum power limits of the engine to determine the upper and lower limits of the electric power assist such that the requested torque will be provided within the desired period, and operating the electric machine to provide electric power assist within said upper and lower limits.

Abstract: A control system for an internal combustion engine having an exhaust gas recirculation device for recirculating a part of exhaust gases to an intake system of the engine is disclosed. An estimated exhaust gas recirculation amount is calculated using a neural network to which at least one engine operating parameter indicative of an operating condition of the engine is input. The neural network outputs an estimated value of an amount of exhaust gases recirculated by the exhaust gas recirculation device. At least one engine control parameter for controlling the engine is calculated based on the estimated exhaust gas recirculation amount.

Abstract: Various embodiments of an apparatus, system, and method are disclosed for improving the tracking bandwidth of an air handling system of an internal combustion engine. For example, one embodiment of an apparatus includes an intake charge module configured to determine a desired air intake flow rate into the combustion chamber based at least partially on a desired oxygen concentration in the combustion chamber. The apparatus also includes an EGR system module configured to determine a desired EGR gas flow rate into the combustion chamber based at least partially on the desired oxygen concentration in the combustion chamber. Additionally, the apparatus includes a pre-filter module configured to modify the desired air intake flow rate and the desired EGR gas flow rate based at least partially on predetermined transient response characteristics of the air handling system.

Abstract: A system for detecting individual cylinder misfire in a multiple cylinder internal combustion (IC) engine having exhaust gas recirculation (EGR). The system includes: a device for predicting EGR flow rate on a cylinder to cylinder basis; a device for sensing actual EGR flow rate on a cylinder to cylinder basis with all cylinders firing; and a device for comparing the predicted EGR flow rate to the actual EGR flow to determine individual cylinder misfire.

Abstract: An engine control system includes a unit which outputs a command for changing an air-fuel ratio of an exhaust gas, a unit which computes an in-cylinder oxygen concentration, a memory which stores a first value and a second value of parameters (ignition timing, injection pressure, pilot injection quantity). The first value is set in a case that the in-cylinder oxygen concentration is a first oxygen concentration. The second value is set in a case that the in-cylinder oxygen concentration is a second oxygen concentration which is higher than the first oxygen concentration. The values of the parameters are set in such a manner as to correlate to the in-cylinder oxygen concentration of during a transition period of the air-fuel ratio. The values of the parameters are obtained by an interpolation based on the first and the second value of the parameter and the in-cylinder oxygen concentration.

Abstract: This invention aims at providing a fuel admission control unit to control a diesel engine, with which ensuring compatibility between the exhaust gas performance and the engine speed response performance is achieved by a simple control with a consideration of the residual oxygen in the EGR gas.

Abstract: In a method of maintaining temperature of engine exhaust gas from cylinders of a multi-cylinder engine (23) with a desired range, exhaust gas from a first group of cylinders (25) including at least one cylinder is routed to at least one of an EGR system (53) and an exhaust system (41). Exhaust gas from a second group of cylinders (27) including at least one of the cylinders is routed to the exhaust system (41). Routing of the exhaust gas from the first group of cylinders between the EGR system and the exhaust system is controlled to maintain a temperature of engine exhaust gas within a desired range. An engine (23), a control system (69), and a controller (71), as well as an exhaust gas mixture, are also disclosed.

Abstract: An internal combustion engine exhaust gas system includes a filter arranged in an exhaust passage of the internal combustion engine, a fuel adding valve which is arranged upstream of the filter and supplies fuel into the exhaust passage, and a low-pressure exhaust gas recirculation apparatus that removes some of the exhaust gas from downstream of the filter as EGR gas. An EGR rate is controlled taking into account the amount of fuel supplied by the fuel adding valve such that an oxygen concentration of intake gas, which is drawn into a cylinder of the internal combustion engine in a state in which the EGR gas that is introduced by the low-pressure exhaust gas recirculation apparatus is mixed with air introduced into an intake passage, is constant before and after fuel is supplied by the fuel adding valve.

Abstract: The present invention provides a control device that is used with an internal combustion engine and capable of achieving a target torque with high accuracy and without being affected by EGR. A target torque setup device sets a target torque for the internal combustion engine. A target EGR rate setup device sets a target EGR rate. A target torque correction device and calculates a correction factor for correcting the influence of EGR on torque in accordance with the target EGR rate and an air amount, and corrects the target torque with the correction factor. A target air amount calculation device calculates a target air amount from the corrected target torque. A controller controls the operations of a plurality of actuators for adjusting an in-cylinder air amount and EGR rate in accordance with the target air amount calculated from the corrected target torque and with the target EGR rate.

Abstract: An engine system includes a nitrogen oxide (NOx) estimation module and a diagnostic module. The NOx estimation module estimates an amount of NOx in an exhaust gas produced by an engine based on a predetermined function of a position of at least one of a camshaft phaser and an exhaust gas recirculation (EGR) valve. The diagnostic module determines a state of at least one of the camshaft phaser and the EGR valve based on a predetermined threshold and a difference between the estimated amount of NOx and an actual amount of NOx in the exhaust gas measured by a NOx sensor.

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: A control apparatus for an internal combustion engine has an exhaust-gas turbocharger regulator which, as a function of a setpoint boost pressure and an actual boost pressure, determines a controlled actuating-variable exhaust-gas back-pressure. An exhaust-gas recirculation regulator determines, as a function of a setpoint air mass flow and an actual air mass flow, a controlled actuating-variable exhaust-gas recirculation mass flow. A first decoupling unit determines a decoupling mass flow in an exhaust-gas section. A second decoupling unit determines a decoupling exhaust-gas back-pressure. A first conversion unit determines a signal for the exhaust-gas turbocharger actuator as a function of the pilot-control actuating-variable exhaust-gas back-pressure, the controlled actuating-variable exhaust-gas back-pressure and the decoupling mass flow.

Abstract: A system for determining the level of sulphur poisoning of a depollution device integrated into the exhaust line of a motor vehicle engine involves controlling the operation thereof, switching the system between a lean storage mode and a rich storage mode, calculating the sulphur storage speed in the lean mode, calculating the sulphur elimination speed in the rich mode, calculating the quantity of sulphur stored in the depollution device during the operation of the engine and comparing the quantity of sulphur with threshold values for determining a poisoning level of the depollution device.

Abstract: In a method for operating a drive unit, for at least one operating quantity of the drive unit, a deviation from an initial value is represented by an adaptation value, which adaptation value is determined at various times. In an extreme value storage unit, a first adaptation value, determined at a first point in time, is stored. A second adaptation value, determined at a second point in time after the first point in time, is compared with the first adaptation value stored in the extreme value storage unit to determine whether the second adaptation value exceeds the first adaptation value in a prespecified direction. In this case, the extreme value storage unit is overwritten by the second adaptation value.

Abstract: An exhaust probe is arranged on an internal combustion engine with multiple cylinders and the injection valves provided for the cylinders measure the fuel. The exhaust probe is arranged on an exhaust manifold, and the measured signal is characteristic of the air/fuel ratio in the corresponding cylinder. The measured signal is recorded at a given crankshaft angle with relation to a reference position for the piston and allocated to the corresponding cylinder. A set parameter for adjustment of the air/fuel ratio in the corresponding cylinder is generated depending on the measured signal recorded for each cylinder. The given crankshaft angle is adjusted depending on a value criterion which depends on a uneven running of an output shaft from the internal combustion engine.

Abstract: An apparatus and method to detect combustion conditions using ion signals for use in a feedback control of a reciprocation engine is presented. The ion signals are used as a feedback signal to control EGR and diesel injection timing. The apparatus is an ignition system with a spark plug type of sensor. The ignition system is used to provide a cold start mechanism for diesel engines and start of combustion for spark ignition engines. The ignition is combined with ion sensing feedback that can control the engine.

Abstract: An internal combustion engine includes at least two cylinders, an intake duct, an exhaust gas section and an exhaust gas recirculation line. The cylinders include a combustion chamber. The intake duct communicates with the combustion chambers via a cylinder inlet channel of the intake duct depending upon a switch position of a gas inlet valve. The exhaust gas section communicates with the combustion chambers depending upon a switch position of at least one gas outlet valve. Exhaust gas is guided back to the inlet channels via the exhaust gas recirculation line dependent upon a switch position of the exhaust gas recirculation valve. To detect a mixing air temperature in the inlet channels, a mixing air temperature sensor is provided. The determined mixing air temperatures are compared. Exhaust gas guided back due to uneven distribution is identified if a difference between the determined mixing air temperature is greater than a predetermined threshold value.

Abstract: A method and system are provided for controlling a throttle valve and an EGR valve in internal combustion engine. The method includes, but is not limited to the steps of measuring an actual fresh mass air flow value entering the engine, determining an exhaust oxygen concentration set point ([O2]spEM) indicative of the oxygen concentration in the exhaust manifold, calculating an air reference value (Airreference) as a function of the exhaust oxygen concentration set point ([O2]spEM) and determining an oxygen concentration feedback value ([O2]fdIM, [O2]fdEM) representative of the oxygen concentration in the engine. The method further includes, but is not limited to the steps of obtaining a position information for the throttvalve by by comparing the actual fresh mass air flow value and air reference value (Airreference) and obtaining a position information for the EGR valve by comparing the oxygen concentration feedback value ([O2]fdIM, [O2]fdEM) and oxygen concentration set point ([O2]spEM).

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: In a feedback control system in which a base gain having a constant value or a variable gain is set as a feedback gain in accordance with the state of the system and an input value is calculated based on a function having, as variables, a proportional term and an integral term, the integral term is recalculated when a discriminant value obtained by substituting a base proportional term calculated using the base gain for the proportional term and a normal integral term calculated using the feedback gain for the integral term in the function is larger than an upper limit value. The integral term is recalculated in such a way that a value obtained by substituting the base proportional term for the proportional term and the recalculated integral term for the integral term in the function becomes equal to or smaller than the upper limit value.

Abstract: In a low load region where torque is lower than T1 but is not lower than T2, the present invention uses a lean single valve small operating angle mode to provide a lean burn in a single valve small operating angle state or uses an EGR single valve small operating angle mode to provide external EGR in a single valve small operating angle mode.

Abstract: A dead time in the case where an output of an air-fuel ratio sensor changes in a lean direction and a dead time in the case where the output changes in a rich direction are sensed respectively. The number of elements constituting data of past feedback correction amounts used for calculating a present feedback correction amount is changed in accordance with the larger one of the dead times. A lean direction response time and a rich direction response time are sensed respectively. A control gain is corrected in accordance with the lean direction response time when the output of the air-fuel ratio sensor changes in the lean direction. The control gain is corrected in accordance with the rich direction response time when the output changes in the rich direction.

Abstract: A system includes a hydrogen fueled internal combustion engine, a fuel system configured to provide a flow of hydrogen fuel to the engine, and an exhaust gas recirculation (EGR) system configured to provide a flow of recirculated gas to the engine which includes exhaust gases. The system also includes an engine controller configured to control the fuel system and the EGR system, such that the engine receives a mixture which includes the hydrogen fuel, the ambient air and the recirculated gas in a stoichiometric fuel/air ratio that meets the torque demand on the engine. A method includes the steps of providing a flow of gaseous hydrogen fuel, a flow of ambient air, and a flow of recirculated exhaust gas to the engine.

Abstract: An internal combustion engine is selectively operative in a spark ignition combustion mode and a controlled auto-ignition combustion mode. An EGR valve operative to control flow of exhaust gas to an intake manifold is monitored, including commanding the EGR valve to a closed position and monitoring operation of the internal combustion engine. An intake manifold pressure due to a fresh air charge is estimated based upon the operation of the engine. The intake manifold pressure is measured, and the estimated intake manifold pressure is compared to the measured intake manifold pressure.

Abstract: At high temperature, namely, when the temperature of intake air is higher than a predetermined normal temperature range, an ECU (25) controls a variable valve timing mechanism (24) such that the timing for closing an exhaust valve (9) is adjusted to a retard side, thereby reducing the amount of high-temperature internal EGR gas to avoid the occurrence of pre-ignition. At intermediate load and high load, the ECU (25) makes the retard amount of the timing for closing the exhaust valve (9) larger than that at low load, thereby reducing the amount of internal EGR gas. At intermediate load and in an intermediate-revolution range or a high-revolution range, the rotating speed of an electric motor (16) is increased to raise a supercharging pressure exerted by a supercharger (17).

Abstract: An air breathing fuel consuming internal combustion engine with EGR and a control for the quantity of EGR. The total gas flow of the engine is calculated by measuring temperature and pressure at the intake to the engine. The fresh air flow is measured by an orifice or venturi at any point in the flow path for fresh air for combustion by the engine prior to the introduction of the EGR flow. The difference between the calculated total flow and fresh air flow is the actual EGR flow which is used to set the EGR relative to total flow according to one of a number of selected control algorithms.

Abstract: Embodiments of an exhaust gas recirculation (EGR) mixing device include an air inlet port and an outlet port disposed at opposite ends of the mixing pipe, an exhaust feeder having a scroll mixing chamber and occupying a portion of the mixing pipe between the air inlet port and the outlet port. The exhaust feeder includes an exhaust feed splitter beam disposed within an open-ended exhaust inlet tube and the scroll mixing chamber, and can be configured to split an exhaust stream into a plurality of exhaust streams before entering the scroll mixing chamber.

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 control apparatus and method for an internal combustion engine are provided for ensuring a stable combustion state and improving the fuel efficiency when an air-fuel mixture is burnt with self ignition while auxiliarily using a spark ignition. The control apparatus for an internal combustion engine which is operated in a plurality of modes including a torch self ignition combustion mode comprises an ECU. In the torch self ignition combustion mode, the ECU controls an internal EGR amount, calculates an actual exhaust closing angle, calculates a target exhaust closing angle, calculates a closing angle deviation, calculates a fuel injection amount for forming a homogeneous air-fuel mixture, calculates a correction coefficient in accordance with the closing angle deviation, and corrects a basic value by the correction coefficient to calculate a fuel injection amount for forming a stratified air-fuel mixture.

Abstract: An engine that re-circulates its exhaust gas suffers decreased accuracy in estimating an EGR rate real-time especially while the operating state of the engine is in a transitional state, which often results in torque fluctuations and deteriorated exhaust gas. A sensor for directly detecting an EGR flow rate is disposed in an EGR path. An EGR rate and in-cylinder oxygen concentration are calculated from the output value of that sensor. In addition, when this EGR rate calculation method is used, the calculation is properly switched between a steady operation state characterized by a low load and small rotational fluctuations and a transitional operating state including the acceleration and deceleration. This makes it possible to correctly estimate the EGR rate and the in-cylinder oxygen concentration under a wide range of engine operation conditions, and thereby to avoid the fluctuation of torque and the deterioration of exhaust gas.

Abstract: Various systems and methods are described for controlling an engine in a vehicle which includes an exhaust passage and an exhaust gas recirculation system. One example method comprises adjusting an engine operating parameter based on an exhaust gas recirculation amount, the exhaust gas recirculation amount based on a first humidity and a second humidity, the first humidity generated from a first humidity sensor at a first location and the second humidity generated from a second humidity sensor located in the exhaust passage of the engine.

Abstract: The invention relates to a method for operating an internal combustion engine, in which the exhaust gas generated by the internal combustion engine is returned to the internal combustion engine by means of an exhaust gas recirculation device having at least two cooling devices which are each associated with a bypass, the exhaust gas being cooled in the exhaust gas recirculation device as a function of the load state of the internal combustion engine. The operation of the internal combustion engine is divided into at least four load states, and as a function of the instantaneous load state the exhaust gas is returned to the internal combustion engine via a flow path in the exhaust gas recirculation device specifically assigned to this load state. The invention further relates to an internal combustion engine having an exhaust gas recirculation device.

Abstract: An EGR control apparatus and method for an internal combustion engine which burns an air-fuel mixture with self ignition in addition to a flame propagation combustion, are provided for improving the combustion efficiency, engine output, drivability, and exhaust gas characteristics in an internal combustion engine which involves a self ignition combustion of an air-fuel mixture in addition to a flame propagation combustion.

Abstract: In a system for controlling a plant (engine) 10 having an input u, there are provided with applying device (vibration signal) 100 for applying a component p that changes at a predetermined cycle to the plant, parameter calculating device (Washout Filter) 102 for calculating a parameter h based on an output y of the plant, integrating device (finite interval integrator) 104 for integrating a value j obtained by multiplying the calculated parameter h by the applied component p in an interval of integral multiple of a cycle of the component p, and input calculating devices (infinite interval integrator 106a, multiplier 106b, adder 106c) for calculating the input u based on the integrated value g obtained by the integration. Owing to this configuration, it becomes possible to provide a system that can optimize the output y, while preventing the resonance of the control system while, thereby enabling to control the output of the plant to the extremum point.

Abstract: A method for the transition of a gasoline engine with direct gasoline injection and with a variable valve train assembly from an initial mode of operation to a target mode of operation, whereby the initial mode of operation and the target mode of operation are either a mode of operation with an externally-supplied ignition or a mode of operation with a self-ignition, wherein the method comprises adapting operating parameters of the initial mode of operation to required values for the target mode of operation in a map-based pilot control phase; shifting the mode of operation after the map-based pilot control phase; and controlling the operation parameters after the shift.

Abstract: A low pressure EGR valve is controlled by mixing EGR gas into an intake air. Steps of the method include detecting temperature and pressure of an intake air passing through an air cleaner, detecting temperature and pressure of the intake air at a downstream side of an intercooler, detecting temperature and pressure of an EGR gas at an upstream side of an EGR cooler, determining a control duty of the low pressure EGR valve on the basis of the detected temperature and pressure of the air passing through the air cleaner, the detected temperature and pressure at the downstream side of the intercooler, and the detected temperature and pressure at the upstream side of the EGR cooler, and controlling the low pressure EGR valve based on the determined control duty. An apparatus for executing the method is also provided.

Abstract: Upon satisfaction of the condition for making the malfunction diagnosis at least one of the EGR system, the air-fuel ratio sensor 135a and the oxygen sensor 135b during the fuel cut of the engine 22, a fuel cut of the engine 22 and performing the mortaring of the engine 22 by means of the motor MG1 are continued until the completion of the malfunction diagnoses of all objects, of which the each condition for making the malfunction diagnosis is satisfied among the EGR system, the air-fuel ratio sensor 135a and the oxygen sensor 135b. This arrangement ensures the occasions for making the malfunction diagnoses of the EGR system, the air-fuel ratio sensor 135a and the oxygen sensor 135b.

Abstract: A control apparatus for a hybrid vehicle, which outputs motive power to a drive shaft from an internal combustion engine and motor generators as motive power sources, including: a recirculating gas control portion that performs valve opening control on a recirculation valve so that an amount of recirculating exhaust reaches a control target valve, and that closes the recirculation valve completely when a deceleration request by a driver is detected; a throttle control portion that performs valve closing control on a throttle valve so that the amount of air circulating through an intake pipe decreases at a predetermined speed when the deceleration request issued by the driver is detected; and a braking control portion that controls regenerative braking forces of the motor generators so that at least one of the motor generators absorbs the motive power generated by the engine while valve closing control is executed on the throttle valve.

Abstract: An internal EGR control device for an internal combustion engine, which is capable of properly controlling an internal EGR amount, while causing conditions of burned gases to be reflected thereon in controlling the internal EGR by changing valve-closing timing of an exhaust valve. An internal EGR control device sets a target internal EGR amount EGRINCMD as a target of the internal EGR amount according to detected operating conditions of an internal combustion engine, and a target internal EGR amount EGRINC is determined by correcting the target internal EGR amount based on a gas state equation, using obtained temperature and pressure of exhaust gases, and a calculated gas constant R. Then, according to the corrected target internal EGR amount EGRINC, the valve-closing timing of an exhaust valve is calculated, and a variable valve mechanism is controlled based on the calculated valve-closing timing of the exhaust valve.

Abstract: A method of operating an internal combustion engine with direct gasoline injection and controlled self-ignition, wherein the internal combustion engine includes a combustion chamber, at least one intake valve and at least one exhaust valve each having an adjustable opening time. The method includes compressing an ignitable gas mixture that contains residual gas in the combustion chamber during a compression stroke, where the gas mixture self ignites, and altering step-wise over multiple combustion cycles at least one of a residual gas volume and a point of injection time to an interim value other than a value assigned to a target load during a load transfer from an initial load to the target load.

Abstract: A combustion control system for a vehicle comprises a pressure ratio (PR) module, a pressure ratio difference (PRD) module, and a pressure ratio difference rate (PRDR) module. The PR module determines fired PR values and measured motored PR values based on cylinder pressures measured by a cylinder pressure sensor when a cylinder of an engine is fired and motored, respectively. The PRD module determines PRD values for predetermined crankshaft angles, wherein each of the PRD values is determined based on one of the fired PR values and one of the measured motored PR values at one of the predetermined crankshaft angles. The PRDR module determines and outputs a PRDR value based on a rate of change of the PRD values over a range of the predetermined crankshaft angles.

Abstract: A control system for an internal combustion engine, which is capable of estimating a property of fuel accurately even when the engine is in an operating condition other than idling. An in-cylinder pressure sensor detects an amount of change in pressure in a cylinder #1 of the engine as a pressure change amount. An ECU calculates an amount of heat released in the cylinder #1 as a heat release amount, according to the pressure change amount. A vehicle speed sensor, a crank angle sensor, and an accelerator pedal opening sensor detect load on the engine. The ECU estimates a cetane number of fuel based on the calculated heat release amount and the detected load on the engine.

Abstract: A method for the diagnosis of an exhaust gas recirculation system in an internal combustion engine, including providing a pressure difference reading, which gives a pressure difference in an air supply section of the internal combustion engine or a pressure difference over the exhaust gas recirculation system; determining a pressure difference reference value as a function of one or more operating variables of the internal combustion engine; and detecting a fault in the exhaust gas recirculation system as a function of the pressure difference reading and of the pressure difference reference value.

Abstract: In a method of operating an internal combustion engine having at least two combustion chambers, each combustion chamber contributes torque to the total torque of the internal combustion engine, and the internal combustion engine is designed in such a way that a quantity of exhaust gas can be recycled into combustion chambers. The method has the steps: (a) detecting the torque contributions of at least two combustion chambers, then (b) changing the quantity of exhaust gas recycled into the combustion chambers, the torque contribution of which has been detected in step (a), then (c) detecting the torque contributions of at least two combustion chambers, the torque contribution of which has been detected in step (a), then (d) determining the change in the torque contributions as a result of the change in the quantity of recycled exhaust gas, and then (e) outputting a signal as a function of the change in the torque contributions.