Abstract: To provide a controller and a control method for an internal combustion engine capable of estimating a discharge plasma length accurately by easy method. Controller for internal combustion engine is provided with a secondary voltage detector that detects secondary voltage which is voltage generated by secondary coil, a secondary voltage minimum value calculator that calculates minimum value of secondary voltage during discharge period, and a discharge plasma length calculator that calculates length of the discharge plasma based on secondary voltage and minimum value of secondary voltage.

Abstract: There is provided an internal combustion engine controller and a control method thereof that can accurately estimate an EGR rate even when the humidity of intake air (the atmospheric air) changes. In the internal combustion engine controller and the control method thereof, an EGR rate is calculated based on an inner-manifold water vapor partial pressure ratio calculated based on a manifold pressure, a manifold temperature, and a manifold humidity and an inner-intake-air water vapor partial pressure ratio calculated based on an intake-air pressure, an intake-air temperature, and an intake-air humidity.

Abstract: To provide a controller and a control method for an internal combustion engine capable of learning the individual difference and the aging change of the flow characteristic of the EGR valve, by a method which is hardly influenced by the individual difference and the aging change of the internal combustion engine body, and improving the estimation accuracy of the flow rate of recirculation exhaust gas. The controller for an internal combustion engine calculates an oxygen concentration detecting EGR rate Regr based on the inner-manifold oxygen concentration; calculates an oxygen concentration detecting recirculation flow rate based on the oxygen concentration detecting EGR rate and the intake air flow rate, and calculates a learning value of the opening area of EGR valve; and calculates a flow rate of recirculation exhaust gas for control based on the learned opening area.

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: To provide a controller and a control method for an internal combustion engine capable of estimating a discharge plasma length accurately by easy method. Controller for internal combustion engine is provided with a secondary voltage detector that detects secondary voltage which is voltage generated by secondary coil, a secondary voltage minimum value calculator that calculates minimum value of secondary voltage during discharge period, and a discharge plasma length calculator that calculates length of the discharge plasma based on secondary voltage and minimum value of secondary voltage.

Abstract: To provide a controller and a control method for an internal combustion engine capable of learning the individual difference and the aging change of the flow characteristic of the EGR valve, by a method which is hardly influenced by the individual difference and the aging change of the internal combustion engine body, and improving the estimation accuracy of the flow rate of recirculation exhaust gas. The controller for an internal combustion engine calculates an oxygen concentration detecting EGR rate Regr based on the inner-manifold oxygen concentration; calculates an oxygen concentration detecting recirculation flow rate based on the oxygen concentration detecting EGR rate and the intake air flow rate, and calculates a learning value of the opening area of EGR valve; and calculates a flow rate of recirculation exhaust gas for control based on the learned opening area.

Abstract: 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.

Abstract: The objective of the present invention is to provide a controller for a supercharger-equipped internal combustion engine and a control method that can reduce man-hours for data measurement and matching, which are required to perform while the internal combustion engine and the supercharger are combined. In a controller, a target turbine flow rate for realizing a target compressor driving force is calculated; a target wastegate flow rate is calculated based on an exhaust gas flow rate and the target turbine flow rate; a target turbine-upstream pressure is calculated based on a target before/after-turbine pressure ratio for realizing the target compressor driving force and a turbine-downstream pressure; a target gate effective opening area is calculated based on the target wastegate flow rate, the target before/after-turbine pressure ratio, and the target turbine-upstream pressure; then, a gate valve control value is calculated.

Abstract: A target injector valve opening period is calculated based on a target fuel injection amount, and an injector (2) is controlled by a current supply control unit (51) in accordance with an injector drive period acquired based on the target injector valve opening period. An actual valve closing delay period is calculated based on a drive waveform of the injector (2) at this time, and a difference between an actual valve closing delay period and a valve closing delay period calculated from a target injector valve opening period is learned. Then, the injector drive period is corrected by feedback control using a result of this learning.

Abstract: To provide a controller and a control method for a supercharger-equipped internal combustion engine capable of assisting the insufficient part if supercharging pressure supercharged by the turbocharger, with a good responsiveness by the electric compressor, using simple calculation, even though using a plurality of superchargers. The controller for supercharger-equipped internal combustion engine calculates, as a target intermediate supercharging pressure, a value subtracting, from the target supercharging pressure, a pressure difference subtracting the real intermediate supercharging pressure from the real supercharging pressure; calculates a pressure ratio of the target intermediate supercharging pressure and the real atmospheric pressure; calculates a target rotational speed of the electric compressor based on the pressure ratio and the real intake air flow rate; and controls the electric motor.

Abstract: A control device for an internal combustion engine is configured to: calculate a target intake air amount and a target charging efficiency based on a target torque; control an opening degree of a throttle valve (6) based on the target intake air amount; calculate a target supercharger downstream pressure based on the target charging efficiency; detect a pressure on an upstream side of a supercharger; calculate a target compressor driving force based on the target intake air amount, the target supercharger downstream pressure, and the supercharger upstream pressure; and calculate a target bypass valve opening degree based on the target compressor driving force, to thereby control an opening degree of a bypass valve (12) provided to a bypass passage for bypassing the supercharger.

Abstract: There is provided a controller and a control method for an internal combustion engine capable of correcting a detection error of a crankshaft angle with high accuracy. The controller of the internal combustion engine is provided with an angle information detection unit that detects an angle interval and a time interval with a specific crank angle sensor, an angle information correction unit that corrects the angle interval or the time interval by the correction value, an angle information calculation unit that calculates a first crank angle acceleration based on the corrected values of first interval number and calculates a second crank angle acceleration based on the corrected values of second interval number which is larger number than the first interval number, and a correction value change unit that changes the correction value so that the first crank angle acceleration approaches the second crank angle acceleration.

Abstract: By calculating a throttle opening learning value based on an actual effective opening area calculated based on the actual flow rate of intake air and an actual throttle opening with respect to variations caused by type differences of throttle valves and by calculating a throttle opening learning completion range indicating the region for which throttle opening learning completion has been determined based on the state of deviation between an effective opening area corrected by throttle opening learning and the actual effective opening area, control that applies the throttle opening learning value or fail-safe of an air flow sensor is performed in a contiguous throttle opening learning completion range.

Abstract: To provide a controller and a control method for an internal combustion engine capable of estimating the cylinder internal pressure of the combustion cylinder accurately in consideration of the torsional vibration of the crankshaft. A controller for an internal combustion engine includes a torsional torque calculator that calculates a value which has an amplitude of the maximum value of torsional vibration torque calculated based on a crank angle acceleration in the combustion period, and vibrates with a preliminarily set natural angular frequency, as a torsional vibration torque in the combustion period; and a cylinder internal pressure estimator that calculates a combustion gas pressure torque, by use of the equation of motion of the rotation system of the crankshaft, based on the crank angle, the crank angle acceleration, and the torsional vibration torque, and estimates the cylinder internal pressure of the combustion cylinder based on the combustion gas pressure torque.

Abstract: There is provided a controller and a control method for an internal combustion engine capable of correcting a detection error of a crankshaft angle with high accuracy. A controller for an internal combustion engine includes an angle information detector that detects an angle interval and a time interval by a specific crank angle sensor; an angle information correction calculator that corrects the angle interval or the time interval by the correction value; an angle information calculator that calculates a crank angle speed, a crank angle acceleration, and an angular acceleration change amount based on the corrected angle interval and the corrected time interval; and a correction value change calculator that change the correction value so that the angular acceleration change amount approaches zero.

Abstract: In an engine control device, a saturated water vapor pressure Ps is calculated from an intake temperature detected by an intake air temperature sensor. A water vapor partial pressure is worked out from the saturated water vapor pressure and humidity detected by a humidity sensor. A specific humidity q and a molar fraction are worked out from the water vapor partial pressure and an atmospheric pressure detected by an atmospheric pressure sensor. A moist air amount is calculated from an intake air amount detected by an AFS on the basis of the molar fraction, and a dry air amount is calculated from this moist air amount on the basis of the specific humidity. A fuel injection amount, an ignition timing, and a target throttle opening are then calculated on the basis of various operation information, using the moist air amount, the dry air amount, and the specific humidity.

Abstract: The control device includes an operation state detector, an intake manifold pressure detector, an air humidity detector, an air temperature detector, an atmospheric pressure detector, and a controller that controls the engine output on the basis of detection results of the detectors. The controller generates humidity information on the air which is taken in by the internal combustion engine, from the humidity, temperature, and atmospheric pressure, calculates a dry air partial pressure by correcting the pressure detected by the intake manifold pressure detector, by using the humidity information, and controls the engine output by taking the pressure detected by the intake manifold pressure detector as a wet air pressure and selecting, according to a control element, either one of the wet air pressure and the dry air partial pressure as a pressure to be used for the engine output control.

Abstract: There is provided a controller, for a supercharger-equipped internal combustion engine, that can accurately estimate a supercharging pressure, without providing a pressure sensor for detecting the supercharging pressure. In a controller for a supercharger-equipped internal combustion engine, a correction value for correcting a supercharging pressure estimation value is changed so that an effective opening area estimation value, estimated based on a supercharging pressure estimation value and the like, approaches a preliminarily set effective opening area default value corresponding to a throttle opening degree detection value.

Abstract: There is provided a controller and a control method for an internal combustion engine capable of correcting a detection error of a crankshaft angle with high accuracy. The controller of the internal combustion engine is provided with an angle information detection unit that detects an angle interval and a time interval with a specific crank angle sensor, an angle information correction unit that corrects the angle interval or the time interval by the correction value, an angle information calculation unit that calculates a first crank angle acceleration based on the corrected values of first interval number and calculates a second crank angle acceleration based on the corrected values of second interval number which is larger number than the first interval number, and a correction value change unit that changes the correction value so that the first crank angle acceleration approaches the second crank angle acceleration.

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.