Patent application number | Description | Published |
20090277247 | CONTROL APPARATUS FOR INTERNAL COMBUSTION ENGINE - Provided is a control apparatus for an internal combustion engine with which temporal and frequency resolutions necessary for analysis of a frequency of knock by digital signal processing are ensured with limited amounts of processing and memory. The control apparatus includes a lowpass filter for eliminating a high frequency component of an output signal from a knock sensor or a cylinder internal pressure sensor, an A/D conversion unit for performing A/D conversion on the output signal from the filter, and DFT processing units for performing digital signal processing on data obtained by the A/D conversion as knock detection units, each of the DFT processing units includes observation interval setting units for dividing the A/D-converted data to set observation intervals each containing a predetermined number of samples, and a multi-frequency simultaneous analysis unit for simultaneously analyzing multiple frequencies by a discrete Fourier transform for each of the set observation intervals. | 11-12-2009 |
20110282561 | CONTROLLER OF INTERNAL COMBUSTION ENGINE | 11-17-2011 |
20140067287 | CYLINDER INTAKE AIR AMOUNT ESTIMATION APPARATUS FOR INTERNAL COMBUSTION ENGINE - 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. | 03-06-2014 |
20150142294 | INTERNAL COMBUSTION ENGINE INNER-CYLINDER PRESSURE ESTIMATION APPARATUS - 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. | 05-21-2015 |
20150226137 | CONTROL DEVICE OF INTERNAL COMBUSTION ENGINE - 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. An exact atmospheric pressure can be thus estimated even in the presence of a variation in throttle machine difference. | 08-13-2015 |
20150377156 | CONTROL APPARATUS FOR AN INTERNAL COMBUSTION ENGINE - 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 ρave(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 ρave(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 P | 12-31-2015 |
20160069285 | INTERNAL COMBUSTION ENGINE EGR FLOW RATE ESTIMATION APPARATUS AND INTERNAL COMBUSTION ENGINE CONTROL APPARATUS - 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. | 03-10-2016 |
20160084176 | CONTROL DEVICE AND CONTROL METHOD FOR AN INTERNAL COMBUSTION ENGINE WITH A SUPERCHARGER - In a control device and method for an internal combustion engine with a supercharger, a first/second temperature sensor and a first/second air pressure sensor are respectively provided on an upstream/downstream side of a supercharging path from a compressor to a throttle valve. A control portion calculates an inflow air mass to the supercharging path and an outflow air mass from the supercharging path, calculates a throttle upstream air mass in a high operational load state from those air masses, calculates a throttle upstream air mass in a low operational load state from outputs of the first temperature sensor and the first air pressure sensor, selects either one of the throttle upstream air masses depending on an operational load state of the engine, and calculates a throttle upstream pressure based on the upstream air mass selected and a second temperature detected by the second temperature sensor. | 03-24-2016 |