Abstract: In a control device for an internal combustion engine, when a fuel-supply cutoff process ends and fuel injection restarts, an increase ratio based on which a base injection amount is increased is set such that the increase ratio when a duration of the fuel-supply cutoff process is long is higher than the increase ratio when a duration of the fuel-supply cutoff process is short. In addition, the increase ratio is decreased with a lapse of time after fuel injection restarts. Further, a decrease rate that is an amount by which the increase ratio is decreased within a prescribed period of time is set such that the decrease rate in the case where the duration of the fuel-supply cutoff process is long is higher than the decrease rate in the case where the duration of the fuel-supply cutoff process is short.

Abstract: An MBT ignition time and a knock ignition time are acquired from an engine rotation speed and engine load, and an ignition time on a delay angle side, out of these ignition times, is set as the most advance angle ignition time. An ignition time on the delay angle side only by the KCS learning value with respect to the most advance angle ignition time is set as a required ignition time, and when an actual ignition time set by a knock control system exceeds a predetermined amount and is positioned on the delay angle side with respect to the required ignition time, it is determined that abnormality occurs in an oil jet. Fail-safe processing to the effect that the opening degrees of a throttle valve are corrected to a closed side is executed in response to the abnormality determination.

Abstract: Provided is a control apparatus for an internal combustion engine, which can adequately perform the control of a fuel injection amount even when an abnormality, a disconnection or the like of a fuel pressure sensor occurs and thereby accurate fuel pressure information is not able to be obtained. A fuel injection valve (26) is provided which is capable of directly injecting fuel into a cylinder. If a target fuel injection amount is smaller than a minimum fuel injection amount that is minimum and is capable of injecting during one opening and closing operation of the fuel injection valve (26), the start timing of fuel injection is set within a period in which an exhaust valve is opened during an exhaust stroke.

Abstract: The internal combustion engine includes a turbocharger and a waste-gate valve. When the operation resumption request is generated while the internal combustion engine is stopped due to automatic stop control, the waste-gate valve fully opens as far as the engine speed is not lower than a predetermined revolution speed. Further, self-recovery control is executed over the internal combustion engine (or more specifically, a fuel injection and ignition operation is resumed). Meanwhile, in a case where the engine speed is lower than the predetermined revolution speed when the operation resumption request is generated, the waste-gate valve fully closes. Subsequently, stop control, which has already been initiated, is continuously executed to bring the internal combustion engine to a complete stop. The waste-gate valve reverts to an open position in preparation for the restart of the internal combustion engine.

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: A diagnostic apparatus for a multicylinder internal combustion engine includes: an EGR portion capable of executing an individual-cylinder EGR in which EGR gas is distributed and supplied individually to cylinders of the engine; a knock detection portion that detects a knock index value that represents degree of knocking, separately for each of the cylinders; an abnormality detection portion that determines presence or absence of a variation abnormality of air/fuel ratios of the cylinders during execution of the individual-cylinder EGR, and that pinpoints an abnormal cylinder after determining that the variation abnormality is present, and that calculates an imbalance index value that represents the degree of variation regarding the abnormal cylinder; and an abnormality location pinpointing portion that pinpoints an abnormality location in the abnormal cylinder based on the imbalance index value and the knock index value of the abnormal cylinder.

Abstract: A control system of an internal combustion engine provided with a first fuel injection valve that injects fuel into a cylinder of the internal combustion engine, a second fuel injection valve that injects fuel into an intake port of the internal combustion engine, an EGR passage that introduces an EGR gas from an exhaust passage of the internal combustion engine to an intake passage thereof, an EGR valve that is arranged in the EGR passage, and an obtaining unit that obtains an amount of intake air in the internal combustion engine. When the EGR valve is open, a determination is made as to whether the amount of intake air is in an increasing tendency or in a decreasing tendency with respect to a change in the cylinder injection ratio, and a value of the amount of intake air thus obtained is corrected based on the determination.

Abstract: A control device for a multi-cylinder internal combustion engine executes feedback control such that an air-fuel ratio detected by an air-fuel ratio detecting unit becomes a target air-fuel ratio, carries out external EGR, and, when an abnormal deviation that an air-fuel ratio of at least any one of cylinders deviates from the target air-fuel ratio has occurred during the feedback control, detects the abnormal deviation and an abnormal cylinder. When the abnormal deviation has been detected during feedback control and external EGR, the control device corrects the target air-fuel ratio to compensate for a detection error of the air-fuel ratio detecting unit due to the influence of specific components of exhaust gas. The control device changes the correction mode on the basis of whether the abnormal cylinder causes more intensive gas flow or equal or less intensive gas flow against the air-fuel ratio detecting unit than the other cylinders.

Abstract: With a control apparatus of a multiple cylinder internal combustion engine, external EGR that circulates exhaust gas in an exhaust passage to an intake passage is executed, and an air-fuel ratio is feedback-controlled such that an air-fuel ratio of the exhaust gas comes to match a predetermined target air-fuel ratio. When a rich deviation in which the air-fuel ratio of a portion of cylinders is off to a rich side from the target air-fuel ratio is detected, a parameter indicative of an amount of the rich deviation is calculated. The target air-fuel ratio is corrected to the rich side according to the calculated parameter. A value of a parameter at which the rich correction is started is changed according to whether external EGR is being executed.

Abstract: In some cylinder deactivation modes (e.g. virtual V-four operation mode in which two cylinders of a V-six engine are deactivated), ignition/combustion may take place in operating cylinders at uneven intervals. In this case, the output torque varies between the immediately subsequent operating cylinders after the deactivated cylinders in the firing order and the other operating cylinders. A multicylinder engine includes an ignition timing adjustment unit. When the ignition takes place in the operating cylinders at uneven intervals during cylinder deactivation, the ignition timing adjustment unit adjusts ignition timing in each of the operating cylinders to smooth the output torque of the operating cylinders.

Abstract: Provided is a control apparatus for an internal combustion engine, which can adequately perform the control of a fuel injection amount even when an abnormality, a disconnection or the like of a fuel pressure sensor occurs and thereby accurate fuel pressure information is not able to be obtained. A fuel injection valve (26) is provided which is capable of directly injecting fuel into a cylinder. If a target fuel injection amount is smaller than a minimum fuel injection amount that is minimum and is capable of injecting during one opening and closing operation of the fuel injection valve (26), the start timing of fuel injection is set within a period in which an exhaust valve is opened during an exhaust stroke.

Abstract: Disclosed is a control device that is for an internal combustion engine with a supercharger and capable of handling an operation resumption request during an internal combustion engine stop period in a situation where waste-gate valve control is exercised in consideration of pumping loss at the time of internal combustion engine stop. The internal combustion engine includes a turbocharger and a waste-gate valve. When the operation resumption request is generated while the internal combustion engine is stopped due to automatic stop control, the waste-gate valve fully opens as far as the engine speed is not lower than a predetermined revolution speed. Further, self-recovery control is exercised over the internal combustion engine (or more specifically, a fuel injection and ignition operation is resumed). Meanwhile, in a case where the engine speed is lower than the predetermined revolution speed when the operation resumption request is generated, the waste-gate valve fully closes.

Abstract: A diagnostic apparatus for a multicylinder internal combustion engine includes: an EGR portion capable of executing an individual-cylinder EGR in which EGR gas is distributed and supplied individually to cylinders of the engine; a knock detection portion that detects a knock index value that represents degree of knocking, separately for each of the cylinders; an abnormality detection portion that determines presence or absence of a variation abnormality of air/fuel ratios of the cylinders during execution of the individual-cylinder EGR, and that pinpoints an abnormal cylinder after determining that the variation abnormality is present, and that calculates an imbalance index value that represents the degree of variation regarding the abnormal cylinder; and an abnormality location pinpointing portion that pinpoints an abnormality location in the abnormal cylinder based on the imbalance index value and the knock index value of the abnormal cylinder.

Abstract: A control device for a multi-cylinder internal combustion engine executes feedback control such that an air-fuel ratio detected by an air-fuel ratio detecting unit becomes a target air-fuel ratio, carries out external EGR, and, when an abnormal deviation that an air-fuel ratio of at least any one of cylinders deviates from the target air-fuel ratio has occurred during the feedback control, detects the abnormal deviation and an abnormal cylinder. When the abnormal deviation has been detected during feedback control and external EGR, the control device corrects the target air-fuel ratio to compensate for a detection error of the air-fuel ratio detecting unit due to the influence of specific components of exhaust gas. The control device changes the correction mode on the basis of whether the abnormal cylinder causes more intensive gas flow or equal or less intensive gas flow against the air-fuel ratio detecting unit than the other cylinders.

Abstract: An internal combustion engine control apparatus includes a fuel supplying mechanism supplying fuel to the internal combustion engine; an exhaust gas recirculating mechanism recirculating exhaust gas of the internal combustion engine to an intake side of the internal combustion engine; a flow adjuster selectively increasing and decreasing a strength of flow of the supplied fuel and the recirculated exhaust gas in a cylinder of the internal combustion engine; a stop controller controlling the fuel supplying mechanism to stop the supply of fuel and controlling the exhaust gas recirculating mechanism to stop the recirculation of exhaust gas, when the internal combustion engine is operated in a predetermined deceleration mode; and in-cylinder flow controller controlling the flow adjuster to increase the strength of the flow when the control to stop the supply of fuel is cancelled.

Abstract: With a control apparatus of a multiple cylinder internal combustion engine, external EGR that circulates exhaust gas in an exhaust passage to an intake passage is executed, and an air-fuel ratio is feedback-controlled such that an air-fuel ratio of the exhaust gas comes to match a predetermined target air-fuel ratio. When a rich deviation in which the air-fuel ratio of a portion of cylinders is off to a rich side from the target air-fuel ratio is detected, a parameter indicative of an amount of the rich deviation is calculated. The target air-fuel ratio is corrected to the rich side according to the calculated parameter. A value of a parameter at which the rich correction is started is changed according to whether external EGR is being executed.

Abstract: In an internal combustion engine using hydrocarbon fuel and hydrogen gas as fuels and including a fuel injection device that injects liquid fuel, a hydrogen-blended fuel in which hydrogen gas is contained in the form of minute bubbles in a liquid hydrocarbon fuel, that is supplied to the fuel injection device. The hydrogen-blended fuel is stored in a fuel tank. Hydrogen gas that has escaped from the hydrogen-blended fuel in the fuel tank is fed to a minute-bubble producing device, which forms the fuel gas into minute bubbles and mixes the minute bubbles back into the hydrogen-blended fuel.

Abstract: The present invention has an object to obtain an accurate amount of intake air at the time of an operation of an EGR mechanism in a control system of an internal combustion engine which is provided with a first fuel injection valve for injecting fuel into a cylinder, a second fuel injection valve for injecting fuel into an intake port, and the EGR mechanism.

Abstract: A medium circulating apparatus of engine oil, which improves startability and warm up ability of an internal combustion engine, includes a microbubble generator that generates microbubbles and mixes the microbubbles into the circulating engine oil. Further, the medium circulating apparatus includes a medium temperature acquiring unit that acquires a temperature of the engine oil. The microbubbles are generated by the microbubble generator when the temperature of the engine oil is less than or equal to a predetermined value in order to decrease a viscosity, a heat conductivity, and a heat capacity of the engine oil in which the microbubbles are mixed.

Abstract: When the amount of fresh air drawn into a combustion chamber is designated Ma and the amounts of exhaust gas recirculated into the combustion chamber by external and internal recirculation mechanisms are designated Megre and Megri, respectively, the exhaust gas recirculation rate (Regre) is defined as (Megre+Megri)/(Ma+Megre+Megri). The base ignition timing applied when Regr=0 is set based on the operating state of an internal combustion engine. An advance amount (IGad) is set such that the characteristic of an increase in IGad with respect to an increase in Regr is a downward convex characteristic. The ultimate ignition timing is set to a timing that is advanced from the base ignition timing by the advance amount (IGad).