Abstract: Provided is an internal combustion engine control device that is capable of accurately estimating a stable combustion state at low cost. An internal combustion engine control device according to one aspect of the present invention includes: a rotational speed calculation unit 122a that calculates a time-series value of a crank rotational speed of an internal combustion engine; a rotational, speed phase calculation unit 122b that calculates a phase of the crank rotational speed from the time-series value of the crank rotational speed calculated by the rotational speed calculation unit; and a cycle variation calculation unit 122c that calculates the magnitude of variation between cycles of the phase of the crank rotational speed calculated by the rotational speed phase calculation unit.

Abstract: To accurately estimate a combustion state even in a case where the combustion state in a combustion chamber greatly changes.

Abstract: Provided is an internal combustion engine control device that is capable of accurately estimating a stable combustion state at low cost. An internal combustion engine control device according to one aspect of the present invention includes: a rotational speed calculation unit 122a that calculates a time-series value of a crank rotational speed of an internal combustion engine; a rotational, speed phase calculation unit 122b that calculates a phase of the crank rotational speed from the time-series value of the crank rotational speed calculated by the rotational speed calculation unit; and a cycle variation calculation unit 122c that calculates the magnitude of variation between cycles of the phase of the crank rotational speed calculated by the rotational speed phase calculation unit.

Abstract: Provided is an internal combustion engine control unit that controls an engine by detecting combustion characteristics with a simple configuration robust to disturbance such as noise. Therefore, the internal combustion engine control unit (ECU 12) of the present embodiment includes a rotational speed calculation unit 122a that calculates a crank rotational speed of an internal combustion engine (engine 1); an extreme value timing calculation unit 122b that calculates an extreme value timing of the crank rotational speed calculated by the rotational speed calculation unit 122a; and a combustion state estimation unit (combustion phase calculation unit 122c) that estimates a combustion state based on the extreme value timing of the crank speed calculated by the extreme value timing calculation unit 122b.

Abstract: Provided is a novel internal-combustion engine control device that can accurately determine a combustion state of an air-fuel mixture in a combustion chamber even in a case where operation is switched between a steady operation state and a transient operation state. For this purpose, the internal-combustion engine control device includes a physical quantity detection unit that detects a physical quantity that fluctuates output of the internal-combustion engine, an output fluctuation value calculation unit that calculates an output fluctuation value for each cylinder based on a detection result of the physical quantity detection unit, and a state determination unit that determines a transient operation state or a steady operation state based on a difference or a ratio between a first output fluctuation value of a predetermined first cylinder and a second output fluctuation value of a predetermined second cylinder calculated by the output fluctuation value calculation unit.

Abstract: An object of the present invention is to enable forming of fuel sprays capable of suppressing discharge of PN, HC, and the like. Thus, in a fuel injection device 100 having a plurality of injection holes, the fuel injection device includes a first injection hole group 801 that is directed in a direction on an exhaust valve 211 side with respect to an intake valve 205 side, and a second injection hole group 802 that is directed in a direction on the intake valve 205 side with respect to the exhaust valve 211 side. A flow rate of the second injection hole group 802 is larger than a flow rate of the first injection hole group 801.

Abstract: Provided is a hybrid vehicle control device excellent in quietness while suppressing knocking within an allowable limit. The hybrid vehicle control device of an aspect of the invention is a hybrid vehicle control device that controls a hybrid vehicle including a motor that drives wheels, a generator that supplies electric power to the motor, and an engine configured by an internal combustion engine that drives the generator, and includes a control unit that calculates a knock index value indicating a knock degree of the engine at an engine operating point represented by a relationship between an engine rotational speed and an engine torque, and controls the engine rotational speed and the engine torque based on the knock index value. As the knock index value decreases, the control unit sets the target engine rotation speed to be lower and the target engine torque to be higher in the target power generation amount.

Abstract: A shot variation in injection quantity of a fuel injection device is reduced. A control device according to an aspect of the present invention performs a first current control for a solenoid by a first current waveform by applying a reverse voltage to the solenoid before a mover or a valve collides with a fixed portion, when an injection quantity of a fuel from opening to closing of the valve of the fuel injection device is a set value or more. In addition, the control device performs a second current control for the solenoid by a second current waveform so that a current larger than a holding current holding the mover or the valve in a state of being in contact with the fixed portion flows to the solenoid, until the mover or the valve collides with the fixed portion, when the injection quantity of the fuel from opening to closing of the valve is less than the set value.

Abstract: In an internal combustion engine, combustion stability is improved while exhaust gas emission is suppressed. For this purpose, a control device (1) for controlling an injector (103) is configured to include a control unit (21) that controls the injector (103) to perform a first fuel injection (1001) for injecting fuel at a first fuel pressure from the injector (103) in an intake stroke (S1) in one combustion cycle of an internal combustion engine (100) and a second fuel injection (1002) for injecting fuel at a second fuel pressure higher than the first fuel pressure from the injector (103) after the first fuel injection (1001) in the same one combustion cycle in the intake stroke (S1).

Abstract: An object of the present invention is to provide a control device of an injector capable of suppressing the influence of pressure reduction boiling even if pressure in a combustion chamber is low. In a case where the temperature of fuel injected from a fuel injection valve is within a set high temperature region and the pressure of the combustion chamber is within a set low pressure region, the control device of an in-cylinder direct injection-type injector according to the present invention controls to increase a lift amount of the injector as compared to the case of a low temperature region or a high pressure region.

Abstract: Emission of unburned hydrocarbons and soot is reduced while ensuring startability (ignitability) in a cold start mode of an internal combustion engine. Thus, fuel is injected with a first injection rate as an injection rate of a fuel injection valve 100 in a warm state in which a temperature of an engine 30 is equal to or higher than a set temperature, and the fuel is injected with a second injection rate lower than the first injection rate as the injection rate of the fuel injection valve 100 in a cold state in which the temperature of the engine 30 is lower than the set temperature at the same fuel pressure as that in the warm state.

Abstract: Provided is a novel internal-combustion engine control device that can accurately determine a combustion state of an air-fuel mixture in a combustion chamber even in a case where operation is switched between a steady operation state and a transient operation state. For this purpose, the internal-combustion engine control device includes a physical quantity detection unit that detects a physical quantity that fluctuates output of the internal-combustion engine, an output fluctuation value calculation unit that calculates an output fluctuation value for each cylinder based on a detection result of the physical quantity detection unit, and a state determination unit that determines a transient operation state or a steady operation state based on a difference or a ratio between a first output fluctuation value of a predetermined first cylinder and a second output fluctuation value of a predetermined second cylinder calculated by the output fluctuation value calculation unit.

Abstract: Provided is a fuel injection device and a control unit therefor which enable reliable ignition even in a case where fuel pressure is low immediately after starting an engine. In the control unit for controlling an injector injecting fuel into an internal combustion engine, a plurality of injectors is provided in the internal combustion engine, a static flow rate of a first injector is configured to be smaller than a static flow rate of a second injector. In a case where a fuel pressure of fuel supplied by a pressurizing unit is lower than a set value set lower than a fuel pressure in warming up, an injection ratio of the first injector is controlled to increase according to a difference between a fuel pressure of fuel from the pressurizing unit and a fuel pressure in warming up.

Abstract: Provided is a control device for an internal combustion engine, which can control an injection amount of water injected into each cylinder of the internal combustion engine to a minimum injection amount that allows knock to be suppressed for each cylinder. Therefore, in a control device 1 that controls water supply valves 35 (water supply devices) that supply water into each of combustion chambers of a plurality of cylinders R (cylinders R1 to R3 in the embodiment) of an internal combustion engine 100, the control device 1 includes a water supply amount calculation unit 2 that calculates a supply amount of water supplied to each of the combustion chambers of the plurality of cylinders R1 to R3 for each cylinder, and a water supply control unit 3 that controls the water supply valves 35 based on the supply amount of water calculated by the water supply amount calculation unit 2 for each cylinder.

Abstract: Combustion stability can be improved while HC and PN discharged from a combustion chamber are prevented. In an ECU that controls a fuel injection device installed in a combustion chamber of an internal-combustion engine so as to be able to inject fuel in a direction intersecting with a sliding direction of a piston, a pressure value of the fuel supplied to the fuel injection device is acquired, control is performed such that the fuel injection device injects the fuel at least twice in a compression stroke, and control is performed such that fuel injection timing of at least one time in the compression stroke is advanced earlier than fuel injection timing of a time corresponding to the high pressure value of the fuel when the acquired fuel pressure value is low.

Abstract: An object of the present invention is to provide a control device of an injector capable of suppressing the influence of pressure reduction boiling even if pressure in a combustion chamber is low. In a case where the temperature of fuel injected from a fuel injection valve is within a set high temperature region and the pressure of the combustion chamber is within a set low pressure region, the control device of an in-cylinder direct injection-type injector according to the present invention controls to increase a lift amount of the injector as compared to the case of a low temperature region or a high pressure region.

Abstract: It is an object of the present invention to provide a novel internal-combustion engine piston which makes it possible to achieve both an improvement in thermal efficiency and a reduction in exhaust harmful components, and to suppress the occurrence of abnormal combustion such as knocking and pre-ignition. A cooling passage is formed in a piston, and on a top face of the piston are provided a first heat shielding layer composed of a material having a lower thermal conductivity and volumetric specific heat than those of a piston base material, and a second heat shielding layer composed of a material having a lower thermal conductivity and volumetric specific heat than those of the first heat shielding layer, wherein a first distance between the first heat shielding layer and the cooling passage is set to be less than a second distance between the second heat shielding layer and the cooling passage.

Abstract: Provided is a control device for an internal combustion engine, which can control an injection amount of water injected into each cylinder of the internal combustion engine to a minimum injection amount that allows knock to be suppressed for each cylinder. Therefore, in a control device 1 that controls water supply valves 35 (water supply devices) that supply water into each of combustion chambers of a plurality of cylinders R (cylinders R1 to R3 in the embodiment) of an internal combustion engine 100, the control device 1 includes a water supply amount calculation unit 2 that calculates a supply amount of water supplied to each of the combustion chambers of the plurality of cylinders R1 to R3 for each cylinder, and a water supply control unit 3 that controls the water supply valves 35 based on the supply amount of water calculated by the water supply amount calculation unit 2 for each cylinder.

Abstract: The invention provides an internal combustion engine control device capable of performing a stable combustion at a lean combustion limit. In an internal combustion engine control device that controls an internal combustion engine provided with an ignition device igniting an air-fuel mixture formed inside a combustion chamber, an intake side air temperature of the internal combustion engine is controlled in response to a compression ratio of the combustion chamber.

Abstract: Provided is a fuel injector that is capable of reducing penetration. The fuel injector of the present invention includes a valve body having a valve body side seat surface, a valve seat side seat surface that abuts on the valve body side seat surface, and an injection hole that is provided downstream of a position at which the valve body side seat surface abuts on the valve seat side seat surface. The valve body has a projection that is formed from the valve body side seat surface toward the injection hole, and the projection is formed to be smaller in a direction of fuel flow between seats than a radius of an upstream opening surface of the injection hole.