Abstract: This invention provides a control apparatus for an internal combustion engine that can accurately determine the existence or non-existence of an operational abnormality of a WGV in an internal combustion engine with a turbocharger that is equipped with an EGR system. The internal combustion engine includes a turbocharger, a WGV arranged in an exhaust bypass passage, an EGR valve arranged in an EGR passage, and a pressure sensor that acquires an intake pipe pressure of the internal combustion engine. The existence or non-existence of an operational abnormality of the WGV is determined based on a change in an intake pipe pressure when a valve opening request to the WGV is acquired. At such time, the EGR valve is controlled so as to enter a predetermined open state prior to the valve opening request to the WGV.

Abstract: The present invention intends to perform control for detecting a change in air-fuel ratio with high accuracy by an exhaust gas sensor in an internal combustion engine having a turbocharger with a wastegate valve. A control apparatus for an internal combustion engine according to the present invention includes: a turbocharger; a wastegate through which an exhaust gas passes while bypassing a turbine; a wastegate valve for opening/closing the wastegate; an exhaust gas sensor provided in an exhaust passage on the downstream side from the turbine and the wastegate valve; and air-fuel ratio change detection controlling means for executing air-fuel ratio change detection control to change an air-fuel ratio on the upstream side from the turbine and the wastegate valve and detect a change in the air-fuel ratio by the exhaust gas sensor.

Abstract: Provided is a control apparatus for an internal combustion engine, which can introduce external EGR gas during a cold condition, while favorably suppressing an occurrence of condensed water from the EGR gas. A twin entry type turbo supercharger (18) is provided. A first exhaust passage (14a) through which first exhaust gas exhausted from a first cylinder group (#2 and #3) and a second exhaust passage (14b) through which second exhaust gas exhausted from a second cylinder group (#1 and #4) are provided. A sub cooling system including a sub cooling passage (32) for cooling the first exhaust passage (14a) is provided. A main cooling system including a main cooling passage (30) for cooling the second exhaust passage (14b) is provided. An EGR passage (24) connected between the first exhaust passage (14a) and an intake passage (12), and an EGR valve (26) playing a role in opening and closing the EGR passage (24) are provided.

Abstract: This invention relates to an internal combustion engine and a control device for the internal combustion engine and has an object to provide an internal combustion engine and a control device therefore that can suppress occurrence of knocking if an EGR rate is increased. An EGR gas can be made to flow separately through one path via one EGR passage and an other path via another EGR passage. The EGR gas flow through the other path can be cooled by an intercooler. Since the intercooler usually has a capacity larger than that of an EGR cooler, its cooling capability is high, and the EGR gas can be made to flow into a surge tank in a state where heat of the EGR gas has been sufficiently emitted.

Abstract: An object of the present invention is that after return from fuel cut, an oxygen storage amount in a catalyst in an exhaust path and an oxygen storage amount in a catalyst in an exhaust gas recirculating path are promptly adjusted to be in appropriate states, respectively. A control apparatus for an internal combustion engine of the present invention controls the internal combustion engine including a recirculating gas generating cylinder and a recirculating gas nongenerating cylinder. The control apparatus includes: an exhaust gas recirculating path for connecting the exhaust path through which exhaust gas only in the recirculating gas generating cylinder is delivered and an intake system; a recirculating catalyst provided on the exhaust gas recirculating path; and rich control means that performs rich control for controlling an air-fuel ratio to be temporarily richer than a theoretical air-fuel ratio when fuel injection is restarted after return from the fuel cut.

Abstract: Provided is a control apparatus for an internal combustion engine, which can introduce external EGR gas during a cold condition, while favorably suppressing an occurrence of condensed water from the EGR gas. A twin entry type turbo supercharger (18) is provided. A first exhaust passage (14a) through which first exhaust gas exhausted from a first cylinder group (#2 and #3) and a second exhaust passage (14b) through which second exhaust gas exhausted from a second cylinder group (#1 and #4) are provided. A sub cooling system including a sub cooling passage (32) for cooling the first exhaust passage (14a) is provided. A main cooling system including a main cooling passage (30) for cooling the second exhaust passage (14b) is provided. An EGR passage (24) connected between the first exhaust passage (14a) and an intake passage (12), and an EGR valve (26) playing a role in opening and closing the EGR passage (24) are provided.

Abstract: In an internal combustion engine with separate cylinder banks, separate exhaust passages are connected to each cylinder bank of an engine and a shared intake passage is connected to both cylinder banks. One end of an EGR passage is connected to the separate exhaust passage of one cylinder bank, and the other end of the EGR is connected to the shared intake passage. If it is determined that an EGR valve in the EGR passage is stuck in an open state, a fuel-cut control is executed in the cylinder bank that is connected to the separate exhaust passage to which the EGR passage is connected. Thus, even when the EGR valve is stuck in an open state, it is possible to prevent the internal combustion engine from operating unstably.

Abstract: An object of the invention is to provide an internal combustion engine control apparatus that can restrain an EGR amount from becoming excessive, and restrain destabilization of combustion . . . . First, in response to a change of an operation condition, operation amounts of a plurality of actuators that influence the EGR amount are set. When the operation amounts of the plurality of actuators are set, operation of an actuator that decreases the EGR amount (referring to an external EGR amount, an internal EGR amount or both, the same applying to the following) is started (S140), and thereafter, operation of another actuator that increases the EGR amount is started (S150).

Abstract: An exhaust purification system for an internal combustion engine capable of lean-burn driving comprises: an NSR catalyst disposed in an exhaust passageway; an SCR disposed downstream of the NSR catalyst; a NOx sensor, disposed downstream of the SCR, for producing output in response to NOx concentration; and rich-spike means for causing a rich-spike. When the NOx sensor has produced output indicative of a NOx concentration higher than a given NOx concentration, the system increases the amount of the NOx contained in the exhaust gas discharged during the rich-spike. Under a given high-load condition, the air-fuel ratio is made stoichiometric during the rich-spike caused at a particular timing. Under a given low-load condition, the amount of exhaust gas is increased during the rich-spike.

Abstract: Disclosed is a valve stopping device for an internal combustion engine that does not allow valves for all cylinders to stop in the closed state even in the event of a failure. The valve stopping device includes a control device 2 and a plurality of actuators 4A, 4B, 4C, 4D, which stop either an intake valve or an exhaust valve. The actuators 4A, 4D for some of a plurality of cylinders included in the internal combustion engine stop a valve in the closed state when energized. The actuators 4B, 4C for the remaining cylinders stop a valve in the closed state when energized. The control device 2 provides control on an individual actuator basis to determine whether or not to energize the actuators 4A, 4B, 4C, 4D.

Abstract: This invention relates to an internal combustion engine and a control device for the internal combustion engine and has an object to provide an internal combustion engine and a control device therefore that can suppress occurrence of knocking if an EGR rate is increased. An EGR gas can be made to flow separately through one path via one EGR passage and an other path via another EGR passage. The EGR gas flow through the other path can be cooled by an intercooler. Since the intercooler usually has a capacity larger than that of an EGR cooler, its cooling capability is high, and the EGR gas can be made to flow into a surge tank in a state where heat of the EGR gas has been sufficiently emitted.

Abstract: An exhaust purification system for an internal combustion engine capable of lean-burn driving comprises: an NSR catalyst disposed in an exhaust passageway; an SCR disposed downstream of the NSR catalyst; a NOx sensor, disposed downstream of the SCR, for producing output in response to NOx concentration; and rich-spike means for causing a rich-spike. When the NOx sensor has produced output indicative of a NOx concentration higher than a given NOx concentration, the system increases the amount of the NOx contained in the exhaust gas discharged during the rich-spike. Under a given high-load condition, the air-fuel ratio is made stoichiometric during the rich-spike caused at a particular timing. Under a given low-load condition, the amount of exhaust gas is increased during the rich-spike.

Abstract: An abnormality detection device for an exhaust gas recirculation apparatus is provided that can perform abnormality detection with respect to an EGR valve while suppressing the influence of a size relationship between an intake pressure and an exhaust pressure. An ECU (Electronic Control Unit) executes processing for extracting a pulse from an intake pipe pressure value. The ECU executes arithmetic processing for performing Fast Fourier Transform (FFT) with respect to an output waveform of an intake pressure sensor obtained by sampling processing, and also executes extraction processing that extracts a “frequency component corresponding to a period of an exhaust pulse”. The ECU executes processing that determines, in steps, whether or not the size of the extracted pulse (amplitude size) exceeds a threshold value. If the amplitude size exceeds the threshold value, the ECU executes processing that determines that a totally closed abnormality is occurring in the EGR valve.

Abstract: An amount of fuel injected into an internal combustion engine is controlled to adjust an air-fuel ratio. An air-fuel ratio sensor is disposed upstream of a three-way catalyst. An ammonia sensor is disposed downstream of the three-way catalyst. Main feedback control based on the air-fuel ratio sensor is performed such that the air-fuel ratio of exhaust gas becomes close to a target air-fuel ratio in the neighborhood of a stoichiometric air-fuel ratio. Sub-feedback control is performed on the basis of an output value of the ammonia sensor.

Abstract: This invention provides a control apparatus for an internal combustion engine that can accurately determine the existence or non-existence of an operational abnormality of a WGV in an internal combustion engine with a turbocharger that is equipped with an EGR system. The internal combustion engine includes a turbocharger, a WGV arranged in an exhaust bypass passage, an EGR valve arranged in an EGR passage, and a pressure sensor that acquires an intake pipe pressure of the internal combustion engine, The existence or non-existence of an operational abnormality of the WGV is determined based on a change in an intake pipe pressure when a valve opening request to the WGV is acquired. At such time, the EGR valve is controlled so as to enter a predetermined open state prior to the valve opening request to the WGV.

Abstract: An object is to provide an abnormal combustion determining apparatus for an internal combustion engine that can identify a major factor causing an oil to flow into a cylinder. The abnormal combustion determining apparatus for the internal combustion engine that includes a plurality of cylinders detects, for each cylinder, a cylinder in which abnormal combustion has occurred. The cylinder in which the abnormal combustion has occurred, and a history of load applied during an operation are stored in memory. It is determined whether or not the cylinder in which the abnormal combustion has occurred and which is stored in memory, is a specific cylinder. It is determined whether or not load present in the history stored in memory and used prior to the occurrence of the abnormal combustion is higher than a threshold value.

Abstract: The control device of the internal combustion engine appropriately controls plural exhaust valves to effectively perform sulfur poisoning recovery in an exhaust gas purifying catalyst. The control device controls the internal combustion engine which performs lean burn. The exhaust system of the internal combustion engine includes: first exhaust valves and second exhaust valves provided in each of the plural cylinders; a first exhaust passage communicating with the first exhaust valves; a second exhaust passage communicating with the second exhaust valves; a first exhaust gas purifying catalyst provided at least one of the first exhaust passage and the second exhaust passage; and a second exhaust gas purifying catalyst provided on an exhaust passage downstream of a junction of the first exhaust passage and the second exhaust passage.

Abstract: A hybrid vehicle including an engine, a generator capable of generating power by being driven by the engine, an electric motor capable of running on power supplied from the generator, a power split device that transmits output from the engine to a driving wheel and the generator and also transmits output from the electric motor to the driving wheel, and a main ECU that controls an output ratio of the engine and an output ratio of the electric motor using the power split device according to the running state of the vehicle. When the operating mode of the engine is switched between a lean burn operating mode and a stoichiometric burn operating mode, the main ECU selectively increases and decreases the output ratio of the electric motor so that the total output, which is the combined output of the engine and the electric motor, is constant.

Abstract: An exhaust gas recirculation device (50) of an internal combustion engine (1) includes an EGR passage (51) linking an exhaust passage (6) and an intake passage (3) of the internal combustion engine, an EGR valve (54) that blocks the EGR passage when closed, an EGR catalyst (52) that is provided between a connection portion with the exhaust passage (6) in the EGR passage and an installation position of the EGR valve and that purifies an exhaust gas flowing in the EGR passage. The exhaust gas recirculation device performs exhaust gas recirculation control by which the EGR valve is opened and the exhaust gas flowing in the exhaust passage is recirculated to the intake passage via the EGR passage. The EGR catalyst is arranged in the vicinity of the connection portion (55) in the EGR passage.

Abstract: An individual exhaust passage is provided independently for each cylinder group in an internal combustion engine having a plurality of cylinder groups each having a plurality of cylinders. A first catalyst is provided in each of the individual exhaust passages. Downstream of those first catalysts, the individual exhaust passages merge to form a common exhaust passage in which a second catalyst is provided. When control of the internal combustion engine is switched from cylinder group-specific control to stoichiometric control, an air-fuel ratio control portion makes the air-fuel ratio of a cylinder group in which the air-fuel ratio was made rich by cylinder group-specific control lean for a predetermined period of time, and makes the air-fuel ratio of a cylinder group in which the air-fuel ratio was made lean by the cylinder group-specific control rich for a predetermined period of time.