Abstract: A first control valve is disposed downstream of a junction point of a first exhaust passage, and a second catalytic converter is disposed downstream of a junction point of the second exhaust passage. The first control valve and the second control valve are controlled so that the exhaust gas of all of the cylinders mainly passes one of the first catalytic converter disposed in the first exhaust passage and the second catalytic converter disposed in the second exhaust passage during a fuel-supply cutoff period.

Abstract: In an exhaust system of an internal combustion engine having a plurality of cylinders, a control valve is disposed downstream of a junction point of one of two exhaust passages of the engine, and a control valve and a catalytic converter are disposed downstream of a junction point of the other of the exhaust passages. The control valves of the two exhaust passages are controlled so that exhaust gas of all of the cylinders mainly passages the catalytic converter of the other exhaust passage during startup of the engine.

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: 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: 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: In a V-type six cylinder engine, cylinder groups are provided in which a plurality of cylinders are arranged divided into left and right first and second banks. An intake pipe, a first exhaust pipe, and a second exhaust pipe are connected to the cylinder groups of the banks. A first upstream three-way catalyst and a first control valve are provided in one exhaust pipe while a second upstream three-way catalyst and a second control valve are provided in the other exhaust pipe. The exhaust pipes are communicated together upstream of the upstream three-way catalysts and the control valves by a communicating pipe. A third control valve that adjusts the flowrate of exhaust gas is provided in the communicating pipe.

Abstract: The invention provides a throttle valve control apparatus of an internal combustion engine having at least a first cylinder group (B1) and a second cylinder group (B2). A first throttle valve (S1) is arranged in an intake passage (31) of the first cylinder group and a second throttle valve (S2) is arranged in an intake passage (32) of the second cylinder group. The throttle valve control apparatus includes a controller that, when there is a demand to switch a combustion air-fuel ratio of the internal combustion engine without changing engine output, first changes an opening amount of the first throttle valve, and then changes an opening amount of the second throttle valve.

Abstract: The present invention has an object to make abnormal combustion of an internal combustion engine detectable by simple means at low cost. For this purpose, an abnormal combustion detecting device provided by the present invention uses a direct injection injector as means for detecting abnormal combustion. In the direct injection injector relating to the abnormal combustion detecting device, a sack chamber is provided at a tip end of a nozzle body, and a nozzle hole is formed to cause the sack chamber and a combustion chamber to communicate with each other. A needle is housed inside the nozzle body, and the sack chamber is opened and closed by the needle, whereby a fuel is directly injected into the combustion chamber.

Abstract: The present invention relates to an exhaust gas purifying apparatus for an internal combustion engine. An object of the invention is to reduce the amount of particulate matter that flows out from a catalytic converter that continuously burns particulate matter contained in an exhaust gas. The exhaust gas purifying apparatus for an internal combustion engine of the present invention includes a catalytic converter that continuously burns particulate matter contained in an exhaust gas; particle amount acquisition means that acquires an inflow amount of particulate matter to the catalytic converter; and particle amount increase means that, when an acquired inflow amount of particulate matter is less than a predetermined threshold value ?, changes a value of a control parameter of the internal combustion engine in a direction such that the inflow amount of particulate matter to the catalytic converter increases.

Abstract: A control device for an internal combustion engine including a turbocharger including a first exhaust channel leading to a turbine of the turbocharger, a second exhaust channel that does not lead to the turbine, a first exhaust valve that opens and closes the first exhaust channel, a second exhaust valve that opens and closes the second exhaust channel, and an exhaust variable valve mechanism that has a medium cam and a small cam as cams that drive the second exhaust valve and can change a lift amount and a working angle of the second exhaust valve by switching the cam profiles. The adjustment of the amount of exhaust energy supplied to the turbine and the adjustment of the turbine revolution speed and supercharge pressure are performed by switching the cam profiles of the second exhaust valve.

Abstract: Concerning an internal combustion engine equipped with an NSR catalyst and an SCR, this invention is intended to provide an exhaust gas purification system for an internal combustion engine, the system being used to suppress degradation of emissions due to blow-through of NOx. The exhaust gas purification system, used for the internal combustion engine susceptible of lean-burn operation, includes an NSR catalyst disposed in an exhaust passageway of the internal combustion engine, an SCR disposed on a downstream side relative to the NSR catalyst, and an element for executing rich-spike control at a predetermined interval during lean-burn operation.

Abstract: An engine has a first cylinder group and a second cylinder group. The first cylinder group and the second cylinder group are connected to a common NOx storage reduction catalyst via their corresponding exhaust passageways and their corresponding three-way catalysts, respectively. When the temperature of the NOx storage reduction catalyst is to be raised, the average air-fuel ratio of the first cylinder group is made rich, and the average air-fuel ration of the second cylinder group is made lean. At this time, in the first cylinder group, the air-fuel of two cylinders is made rich and the air-fuel ration of one cylinder is made lean, and in the second cylinder group, the air-fuel ratio of two cylinders is made lean and the air-fuel ratio of one cylinder is made rich, in accordance with an embodiment.

Abstract: A control device for an internal combustion engine includes a fuel injection device that injects a fuel in accordance with a required injection amount that is required for combustion in a combustion chamber that is performed to produce an output of the internal combustion engine, and a fuel property specific determination device that specifically determines a fuel property of the fuel injected. The control device further includes a control device that performs an output correction process of controlling at least a portion of the internal combustion engine so as to correct the produced output based on a difference in the specifically determined fuel property. According to the control device and a control method thereof, driveability is secured even in the case where a blended fuel is used during a high load region of the internal combustion engine.

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: In an internal combustion engine which can switch the number of cylinders in operation between the total number of cylinders and some of the cylinders, an EGR rate at a time of a transitional operation can be kept correct at a time of any of a full cylinder operation and a partial cylinder operation. A throttle is operated to an opening degree corresponding to an accelerator operating amount and the number of cylinders in operation so that outputs with respective to the accelerator operating amount become equal at the time of the full cylinder operation and at the time of the partial cylinder operation. When the opening degree of the throttle is changed due to change in the accelerator operating amount, the opening degree of the EGR valve is changed at a relatively high speed at the time of the full cylinder operation, and the opening degree of the EGR valve is changed at a relatively low speed at the time of the partial cylinder operation.

Abstract: An upstream catalyst and a downstream catalyst are arranged in series and are housed in a common casing disposed in an engine exhaust passage. The upstream catalyst including a NOx storage-reduction catalyst that adsorbs NOx contained in incoming exhaust gas when the air-fuel ratio of the incoming exhaust gas is lean, and releases and reduces the adsorbed NOx when the air-fuel ratio of the incoming exhaust gas becomes rich, and the downstream catalyst includes a three-way catalyst. The upstream catalyst has a higher oxidizing capability than the downstream catalyst, and the downstream catalyst has a higher reducing capability than the upstream catalyst. The upstream catalyst has a multi-layer structure including an upper layer and a lower layer, and is prepared such that the upper layer has a higher oxidizing capability than the lower layer, and the lower layer has a higher reducing capability than the upper layer.

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: In an exhaust purification system that purifies exhaust from a plurality of cylinder groups of an internal combustion engine, an exhaust passageway (1,51) from each cylinder group is divided into a plurality of passageways (2a, 2b, 52a, 52b/3,53). With regard to one or more of the divided exhaust passageways (3,53), the amount of exhaust passing therethrough is reduced so as to reduce the heat release to the outside from the exhaust as a whole. In this manner, the temperature of exhaust introduced into an exhaust purification device (4,54) is kept at high temperature.

Abstract: A dual injection type internal combustion engine including an injector for in-cylinder injection and an injector for intake manifold injection includes a learning device for learning a background noise level based on an output signal of a knock sensor, and a knocking suppression control device for performing, while learning the background noise level, knocking suppression control by controlling fuel injection of the injector for in-cylinder injection or the injector for intake manifold injection. Alternatively, the engine includes a fixing device for fixing, while learning the background noise level, a start timing or end timing of fuel injection by the injector for in-cylinder injection at a basic timing determined by an operating state of the engine.

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.