Abstract: A control device for an internal combustion engine according to the present embodiment, includes: cooling units 40L and 40R arranged on a path where a coolant is circulated, and cooling an exhaust gas of the internal combustion engine with the coolant flowing through the cooling units 40L and 40R; and ECUs 7L and 7R estimating a heat quantity of the exhaust gas, and deciding whether or not to prohibit an idle reduction control in response to the estimated heat quantity of the exhaust gas.

Abstract: A control device for an internal combustion engine according to an embodiment includes: cooling units arranged on a path where a coolant is circulated, and cooling an exhaust gas of the internal combustion engine with the coolant flowing through the cooling units; a pump circulating the coolant; and ECUs estimating a heat quantity of the exhaust gas and deciding whether or not to operate the pump after an ignition switch is detected to be OFF in response to the estimated heat quantity of the exhaust gas.

Abstract: A control apparatus and control method is provided for an internal combustion engine that includes a vaporized fuel tank in which vaporized fuel is stored, and a normally-closed vaporized fuel supply valve that opens and closes a connecting portion between the vaporized fuel tank and a surge tank. This apparatus and method produce vaporized fuel by injecting fuel into the tank while the vaporized fuel supply valve is closed while the engine is operating, then open the vaporized fuel supply valve at engine startup and supply the vaporized fuel stored in the tank to the surge tank. If there is no vaporized fuel remaining in the vaporized fuel tank when the engine stops, vacuum is generated in the vaporized fuel tank by temporarily opening the vaporized fuel supply valve before the engine stops. Vaporized fuel is then produced by injecting fuel into the vaporized fuel tank in this vacuum state.

Abstract: In a control of an internal combustion engine control apparatus, the control apparatus includes: a fuel tank that stores a fuel; a vaporized fuel tank that is connected to an intermediate portion of an intake passageway of an internal combustion engine and that stores a vaporized fuel that is formed by vaporization of the fuel; an in-tank fuel supply device that supplies the fuel from the fuel tank into the vaporized fuel tank; and a normally-closed vaporized fuel supply valve that opens and closes a connecting portion between the vaporized fuel tank and the intake passageway. The control apparatus estimates air/fuel ratio in the vaporized fuel tank, and produces the vaporized fuel in the vaporized fuel tank by driving the in-tank fuel supply device, with the vaporized fuel supply valve closed, until the estimated air/fuel ratio becomes substantially zero, during operation of the engine.

Abstract: A control apparatus for an internal combustion engine includes a fuel tank; a vaporized fuel tank that is connected to an intake passage; an in-tank fuel supplying portion that supplies fuel in the fuel tank to the vaporized fuel tank; a vaporized fuel supply valve that opens and closes a connecting portion between the vaporized fuel tank and the intake passage; an air introduction valve provided in the vaporized fuel tank; a throttle valve; a vaporized fuel producing portion that produces vaporized fuel in the vaporized fuel tank; a vaporized fuel supplying portion that supplies vaporized fuel stored in the vaporized fuel tank; and a supply amount controlling portion that controls a supply amount of vaporized fuel according to an opening amount of the throttle valve by driving the throttle valve when supplying vaporized fuel.

Abstract: A fuel feed chamber and a residual fuel chamber that are connectable to each other via a shutoff valve are provided in a fuel tank. When the fuel tank is refueled, the fuel feed chamber and the residual fuel chamber, which have been connected to each other so far, are disconnected and then fuel is fed only into the fuel feed chamber to refuel the fuel tank. When the engine is restarted after the refueling, only the fuel in the residual fuel chamber is supplied to the engine while the fuel feed chamber and the residual fuel chamber remain disconnected from each other, and the engine is controlled in accordance with the property of the fuel in the residual fuel chamber, which has been determined in advance.

Abstract: When an engine shifts to idle operation in a process of stopping an automobile, a target engine speed of an engine idle speed control is reduced and a threshold engine speed of an engine speed reduction prevention control is also reduced accordingly, provided that the automobile is traveling on a road surface with low friction coefficient.

Abstract: When an automobile is traveling on a road surface with a low friction coefficient upon a shift of an engine to idle operation in the process of stopping the automobile from traveling, a target engine speed of the engine is reduced by a value equivalent to a reduction in a drive request value for any auxiliary at a time point corresponding to start of reduction of the drive request value.

Abstract: A fuel injection controlling apparatus (electronic control unit) of an internal combustion engine, which can cause first to fourth fuel injection valves of respective cylinders connected to a fuel delivery pipe to inject a fuel, which is heated after fed from a fuel pump (feed pump), is provided with a fuel pump control unit that stops a drive of the fuel pump (feed pump) until the heated fuel in the fuel delivery pipe is reduced to a predetermined amount or less.

Abstract: A multifuel internal combustion engine in which single low boiling point component fuel and at least one kind of fuel having properties different from those of the single low boiling point component fuel are introduced into a combustion chamber CC separately or together thereby operating the multifuel internal combustion engine, includes lubricant-oil temperature detecting unit means (temperature sensor 91) that detects a temperature of lubricant oil, or lubricant-oil temperature estimating unit means that estimates the temperature, and purge control unit means (electronic control unit 1) that prohibits purge control by an evaporation gas purge apparatus (evaporation gas passage 42, check valve 43, canister 44, on-off valve 45) or reduces a purge flow rate of evaporation gas in the purge control, when the detected or estimated temperature of the lubricant oil is near a boiling point temperature of the single low boiling point component fuel at which it is necessary to reduce a fuel injection amount from a fue

Abstract: A fuel feed chamber and a residual fuel chamber that are connectable to each other via a shutoff valve are provided in a fuel tank. When the fuel tank is refueled, the fuel feed chamber and the residual fuel chamber, which have been connected to each other so far, are disconnected and then fuel is fed only into the fuel feed chamber to refuel the fuel tank. When the engine is restarted after the refueling, only the fuel in the residual fuel chamber is supplied to the engine while the fuel feed chamber and the residual fuel chamber remain disconnected from each other, and the engine is controlled in accordance with the property of the fuel in the residual fuel chamber, which has been determined in advance.

Abstract: A combustion condition for each of plural cylinders included in an internal combustion engine is set by the following control that is performed according to an intake air amount in each of the plural cylinders. A reference cylinder is set to a cylinder in which the intake air amount is smallest, and a fuel injection amount for the reference cylinder is set to a fuel injection amount for realizing a stoichiometric air-fuel ratio. The air-fuel ratio in each of the cylinders other than the reference cylinder is set according to the intake air amount in each of the cylinders such that the torque equal to reference torque generated in the reference cylinder is generated. When this setting is performed, air-fuel ratios that are out of a predetermined region in the vicinity of the stoichiometric air-fuel ratio (i.e., air-fuel ratios that are in an avoidance region) are excluded.

Abstract: A cylinder air filling amount is divided into a first amount of air and a second amount of air, the first amount of air and the second amount of air are calculated, and the first amount of air and the second amount of air are totaled to calculate a cylinder air filling amount. The first amount of air is the excess of the cylinder air filling amount with respect to the throttle valve air passage amount occurring due to an intake stroke being performed. The drop in intake pressure occurring due to an intake stroke being performed is detected for each cylinder and the total value of the intake pressure drop in a 720° crank angle range is calculated. The first amount of air is calculated based on an intake pressure drop and the intake pressure drop total value. Due to this, it is possible to simply and accurately calculate a cylinder air filling amount.

Abstract: A control device of a multicylinder internal combustion engine provided with a valve operating characteristic control means for controlling a valve operating characteristic of at least one of an intake valve and exhaust valve, which estimates an intake difference of cylinders and limits a control range of said valve operating characteristic in accordance with said estimated intake difference.

Abstract: An intake pressure is successively detected by a pressure sensor, and an intake pressure derivative is calculated. Next, a peak pressure detecting range for each cylinder is set based on the intake pressure derivative. Next, an upward peak pressure and a downward peak pressure of the intake pressure, included in the peak pressure detecting range, are detected for each cylinder. Next, an intake pressure drop for each cylinder is calculated from the upward peak pressure and the downward peak pressure. The in-cylinder charged air amount is calculated based on the intake pressure drop.

Abstract: A cylinder air filling amount is divided into a first amount of air and a second amount of air, the first amount of air and the second amount of air are calculated, and the first amount of air and the second amount of air are totaled to calculate a cylinder air filling amount. The first amount of air is the excess of the cylinder air filling amount with respect to the throttle valve air passage amount occurring due to an intake stroke being performed. The drop in intake pressure occurring due to an intake stroke being performed is detected for each cylinder and the total value of the intake pressure drop in a 720° crank angle range is calculated. The first amount of air is calculated based on an intake pressure drop and the intake pressure drop total value. Due to this, it is possible to simply and accurately calculate a cylinder air filling amount.

Abstract: An engine body includes a plurality of cylinders, and the intake valve lift-amount of each cylinder is changed based on the engine operating state. A pressure sensor continuously detects the intake pressure, which is the pressure in an intake pipe, to detect the intake pressure decrease amount, which is the amount of decrease in the intake pressure caused due to execution of the intake stroke, of each cylinder. The air quantity variation correction coefficient, which is used to compensate for the variation in the in-cylinder supplied-air quality with each cylinder, is calculated based on the detected intake pressure decrease amount, and the fuel injection amount is corrected using the air quantity variation correction coefficient.

Abstract: An intake pressure is successively detected by a pressure sensor, and an intake pressure derivative is calculated. Next, a peak pressure detecting range for each cylinder is set based on the intake pressure derivative. Next, an upward peak pressure and a downward peak pressure of the intake pressure, included in the peak pressure detecting range, are detected for each cylinder. Next, an intake pressure drop for each cylinder is calculated from the upward peak pressure and the downward peak pressure. The in-cylinder charged air amount is calculated based on the intake pressure drop.

Abstract: A control device of a multicylinder internal combustion engine provided with a valve operating characteristic control means for controlling a valve operating characteristic of at least one of an intake valve and exhaust valve, which estimates an intake difference of cylinders and limits a control range of said valve operating characteristic in accordance with said estimated intake difference.

Abstract: An engine body includes a plurality of cylinders, and the intake valve lift-amount of each cylinder is changed based on the engine operating state. A pressure sensor continuously detects the intake pressure, which is the pressure in an intake pipe, to detect the intake pressure decrease amount, which is the amount of decrease in the intake pressure caused due to execution of the intake stroke, of each cylinder. The air quantity variation correction coefficient, which is used to compensate for the variation in the in-cylinder supplied-air quality with each cylinder, is calculated based on the detected intake pressure decrease amount, and the fuel injection amount is corrected using the air quantity variation correction coefficient.