Abstract: Based on an internal EGR ratio and desired external and internal EGR ratios, an EGR valve opening degree is feedback-controlled based on a desired EGR ratio, calculated in such a way as to perform correction so that a total EGR ratio becomes constant, and an EGR effective opening area obtained through learning of the relationship between an EGR valve opening degree and an effective opening area; thus, a correct characteristic of EGR valve opening degree vs. effective opening area can be maintained and hence it is made possible to absorb variations, changes with time, and even environmental conditions, while making an EGR valve and an intake/exhaust VVT collaborate with each other; therefore, an EGR flow rate can accurately be estimated.

Abstract: Provided is a control device for an internal combustion engine, capable of controlling acceleration-response characteristics, performing an operation at an optimal fuel-efficiency point, and learning variation factors in an internal combustion engine provided with a supercharger including a wastegate valve. A target throttle-valve upstream pressure is calculated based on a target charging efficiency and a rotation speed. An exhaust-gas flow rate is calculated based on an air/fuel ratio and an intake-airflow rate. A target compressor driving force is calculated based on a target intake-airflow rate and a target throttle-valve upstream pressure. A wastegate-valve control value is calculated from the exhaust-gas flow rate and the target compressor driving force by using the relationship in which the relation expression expressing the characteristics of the exhaust-gas flow rate and the target compressor driving force depends only on the wastegate-valve control value.

Abstract: An estimation device for a cylinder intake air amount in an internal combustion engine can estimate a cylinder intake air amount to a sufficient accuracy for suitable engine control, in either of steady state operation and transient operation with a small number of adaptation constants and a small amount of calculation load, without requiring a huge memory capacity. The relation between an opening degree and an effective opening area of a throttle valve has been learned, while calculating the cylinder intake air amount in an S/D method from a volumetric efficiency correction factor map adapted by valve timing at the time of steady state operation, and in a period from a transient change until an exhaust manifold temperature is converged, an intake air amount is calculated based on the relation thus learned. The cylinder intake air amount is calculated based on a physical model of an intake system response delay.

Abstract: A control apparatus for an internal combustion engine comprises a throttle upstream pressure estimation unit which calculates, based on an AFS intake air amount from an AFS and an intake manifold pressure, an average density ?ave(n) in a region combining a supercharged portion from a downstream of a compressor to an upstream of a throttle valve and an intake manifold, and estimates a throttle upstream pressure based on the intake manifold pressure and the average density ?ave(n). Further, the throttle upstream pressure estimation unit learns a relationship between a throttle opening degree and an effective opening area to correct a throttle upstream pressure estimated value (estimated P2) based on a range of a throttle opening degree learning value, the throttle opening degree learning value, and a dispersion of the actual throttle opening degree error.

Abstract: Provided are a control device and a control method for an internal combustion engine, which enable a throttle-valve upstream pressure through simple calculation processing without being affected by a state of an opening degree of a wastegate valve (WGV). When a wastegate (WG) command value to a WGV driving section (212) for driving a WGV (33a) provided in a bypass passage (33) which bypasses a turbocharger (32) is to control supercharging to be weakened to the lowest level, the throttle-valve upstream pressure is estimated from an exhaust-gas amount. Otherwise, a value obtained by adding a preset value to an intake-manifold pressure is used as a throttle-valve upstream pressure estimate value. As a result, the throttle-valve upstream pressure is estimated with high accuracy by an inexpensive configuration without mounting a throttle-valve upstream pressure sensor, and then engine control is performed.

Abstract: Provided is a cylinder intake air amount estimation apparatus for an internal combustion engine, which is capable of highly precisely calculating a cylinder intake air amount based on an AFS intake air amount in a control system for an engine including a supercharger. A cylinder intake air amount calculation part calculates the cylinder intake air amount based on an intake opening intake air amount by using a physical model of an intake system derived based on a volume efficiency acquired by considering an intake manifold as a reference, which is a volume efficiency of air entering a cylinder from the intake manifold, a virtual intake manifold volume, and a stroke volume per cylinder, the physical model being adapted to the control system for an engine including a supercharger.

Abstract: An estimation device for a cylinder intake air amount and an internal EGR rate in an internal combustion engine is provided which is capable of making an estimation with a high degree of accuracy in a small number of adaptation constants. The estimation device calculates a volumetric efficiency corresponding value and the internal EGR rate based on an exhaust efficiency (a linear function of intake pipe internal pressure) which is an index indicating an amount of residual gas which is an exhaust gas after combustion remaining in the cylinder without being discharged from the cylinder to an exhaust pipe, and an intake efficiency (a linear function of intake pipe internal pressure) which is an index indicating an amount of air coming into the cylinder from the intake pipe excluding the residual gas.

Abstract: In the control device, a relationship of a throttle-upstream pressure with respect to an exhaust-gas amount is used in a state where a supercharge pressure becomes the lowest by a WG-instruction value with respect to a WGV-control component 220 for driving a WGV 33a provided at a bypass passage 33 bypassing a turbocharger 32, and a relationship of a throttle-upstream pressure with respect to an aperture of a throttle valve 23, a rotational speed of an engine, and an intake-manifold pressure is used, and any of the throttle-upstream pressures, whichever is higher, being calculated in accordance with each of the relationship, is defined as a throttle-upstream-estimation value, whereby the throttle-upstream pressure is estimated by a cheap means with high accuracy so as to control the engine.

Abstract: In a control device of an internal combustion engine, an atmospheric pressure estimation portion includes an effective opening area calculation portion calculating an effective opening area corresponding to a throttle opening, a throttle opening learning value calculation portion calculating a learning value in a relation of the effective opening area and the throttle opening, an error variation calculation portion calculating an error variation from an error from the corrected learning value, a variation range determination portion determining whether the error variation is within a predetermined range, an atmospheric pressure estimated value update portion updating an atmospheric pressure estimated value, and a target throttle opening calculation portion calculating a target throttle opening using the updated atmospheric pressure estimated value. The throttle opening is controlled to be the target throttle opening.

Abstract: An internal combustion engine inner-cylinder pressure estimation apparatus includes a detection unit that detects an operation condition of an internal combustion engine, a calculation unit that calculates an ignition delay that is an interval from an ignition timing to a starting timing of heat generation by combustion, based on an operation condition detected by the detection unit, and a combustion velocity calculation unit that calculates a combustion velocity, based on the operation condition. There is simulated a phenomenon that after an ignition delay period following an ignition timing has elapsed, a flame generated at the gap portion of an ignition plug expands up to the inner-cylinder wall surface at the combustion velocity and in the shape of an ellipsoid whose center is the gap portion of the ignition plug.

Abstract: An estimation device for a cylinder intake air amount in an internal combustion engine is obtained which can estimate an amount of air actually sucked into a cylinder with a high degree of accuracy by using a physical model of an intake system. A volumetric efficiency corresponding value is calculated based on an exhaust efficiency (a linear function of intake pipe internal pressure) which is an index indicating an amount of residual gas which is an exhaust gas after combustion remaining in the cylinder without being discharged from the interior of the cylinder to an exhaust pipe, and an intake efficiency (a linear function of intake pipe internal pressure) which is an index indicating an amount of air coming into the cylinder from an intake pipe excluding the residual gas, whereby the estimation is carried out to a high degree of accuracy with a small number of adaptation constants.

Abstract: There is provided an internal combustion engine control apparatus that can more accurately calculate a volume efficiency correction coefficient and can more accurately estimate the amount of air that flows into a cylinder and the external exhaust gas recirculation amount. In an internal combustion engine provided with an exhaust gas recirculation apparatus including an exhaust gas recirculation valve and an exhaust gas recirculation path, based on a cylinder flow rate, an exhaust gas recirculation amount, an inner-intake-pipe density, and an inner-intake-pipe density changing amount, a volume efficiency correction coefficient, as a volume efficiency corresponding value, is calculated; then, by use of the calculated volume efficiency correction coefficient, a cylinder intake air amount and a recirculation amount of exhaust gas that is taken into the cylinder are calculated.

Abstract: Provided are a control device and a control method for an internal combustion engine, which enable a throttle-valve upstream pressure through simple calculation processing without being affected by a state of an opening degree of a wastegate valve (WGV). When a wastegate (WG) command value to a WGV driving section (212) for driving a WGV (33a) provided in a bypass passage (33) which bypasses a turbocharger (32) is to control supercharging to be weakened to the lowest level, the throttle-valve upstream pressure is estimated from an exhaust-gas amount. Otherwise, a value obtained by adding a preset value to an intake-manifold pressure is used as a throttle-valve upstream pressure estimate value. As a result, the throttle-valve upstream pressure is estimated with high accuracy by an inexpensive configuration without mounting a throttle-valve upstream pressure sensor, and then engine control is performed.

Abstract: A knock control apparatus for internal combustion engine includes: a knock signal normalization unit that normalizes a knock signal extracted from an output signal of a knock sensor; a knock determination threshold setting unit that sets a knock determination threshold on the basis of the normalized knock signal; a knock intensity computation unit that calculates knock intensity on the basis of the normalized knock signal and the set knock determination threshold; a knock determination unit that determines a presence or absence of a knock on the basis of the calculated knock intensity; and a knock correction amount computation unit that calculates a knock correction amount to correct the calculated knock intensity in a case where an occurrence of a knock is determined. The knock signal normalization unit normalizes a standard deviation of the knock signal by dividing the knock signal by an average value of the knock signal.

Abstract: There is provided an internal combustion engine control apparatus including an exhaust gas recirculation amount estimation unit that can estimate an EGR flow rate with an accuracy enough to appropriately control an internal combustion engine. An internal combustion engine control apparatus according to the present invention has an exhaust gas recirculation amount estimation unit that learns the relationship between a detected opening degree of an exhaust gas recirculation valve and a calculated effective opening area of the exhaust gas recirculation valve and estimates an exhaust gas recirculation amount, based on the relationship between a control exhaust gas recirculation valve effective opening area calculated based on the learning and an opening degree of the exhaust gas recirculation valve; for controlling an internal combustion engine, the internal combustion engine control apparatus utilizes the exhaust gas recirculation amount estimated by the exhaust gas recirculation amount estimation unit.

Abstract: There is provided an internal combustion engine control apparatus having an exhaust gas recirculation amount estimation unit that learns the relationship between an exhaust gas recirculation valve opening area calculated by an exhaust gas recirculation valve opening area calculation unit and an opening degree of the exhaust gas recirculation valve and estimates an recirculation amount of exhaust gas utilized in controlling an internal combustion engine, based on the relationship between the exhaust gas recirculation valve opening area and the opening degree of the exhaust gas recirculation valve.

Abstract: A pre-ignition estimation/control device includes: an octane number estimation module for estimating an octane number of a fuel based on detection signals received from an intake air temperature sensor, a water temperature sensor, etc; a pre-ignition-occurrence-index calculation module for calculating a pre-ignition occurrence index based on the estimated octane number and the like; a pre-ignition-occurrence-index correction module for correcting the pre-ignition occurrence index so as to cause the pre-ignition more likely to occur; an effective-compression-ratio-boundary calculation module for calculating a boundary of an effective compression ratio based on the pre-ignition occurrence index; an intake-cam-phase-advance calculation module for calculating a phase advance of an intake cam based on the boundary of the effective compression ratio and the like; and an intake-cam-phase control module for controlling an intake-cam variable phasing system based on the phase advance of the intake cam, to thereby rest

Abstract: An estimation device for a cylinder intake air amount in an internal combustion engine can estimate a cylinder intake air amount to a sufficient accuracy for suitable engine control, in either of steady state operation and transient operation with a small number of adaptation constants and a small amount of calculation load, without requiring a huge memory capacity. The relation between an opening degree and an effective opening area of a throttle valve has been learned, while calculating the cylinder intake air amount in an S/D method from a volumetric efficiency correction factor map adapted by valve timing at the time of steady state operation, and in a period from a transient change until an exhaust manifold temperature is converged, an intake air amount is calculated based on the relation thus learned. The cylinder intake air amount is calculated based on a physical model of an intake system response delay.

Abstract: A knock correction amount computation portion computes, on the basis of intensity of a knock in a case where the presence of an occurrence of the knock is determined, a knock correction amount by which to move a spark timing of the internal combustion engine to be on a retard side and returns the knock correction amount to be back on an advance side in a case where the absence of an occurrence of a knock is determined. In a case where a value of the knock correction amount to be on the retard side becomes equal to or exceeds a predetermined value, the knock correction amount computation portion limits and holds the knock correction amount at the predetermined value and returns the limited knock correction amount to be back on the advance side in a case where the absence of an occurrence of a knock is determined.

Abstract: An estimation device for a cylinder intake air amount in an internal combustion engine can make calculations in real time with a high accuracy in a small number of adaptation constants. The device includes an AFS, a volumetric efficiency corresponding value calculation unit that calculates a volumetric efficiency correction factor which is an index indicating an amount of air entering a cylinder, a physical model that models a response delay of an intake system, and a unit that calculates a cylinder intake air amount actually sucked into the cylinder by using the amount of intake air, the volumetric efficiency correction factor and the physical model. The volumetric efficiency correction factor required for calculating the amount of air sucked into the cylinder by a response delay model of the intake system is calculated by using the intake air amount, an intake manifold density, and an intake manifold density change amount.