Abstract: Provided is a novel control device of an internal combustion engine capable of estimating an EGR rate in a transient state with high accuracy. Thus, in the present invention, unit spaces are formed by dividing a reference space of the intake passage into a plurality of spaces along a streamline through which the gas mixture of the intake air and the EGR gas flows, a physical model based on an advection equation for estimating the EGR rate of the gas mixture is established so as to correspond to each of the unit spaces, and the EGR rate at which the gas mixture flows into the combustion chamber is estimated by sequentially estimating the EGR rates of the unit spaces connected to head unit spaces from the head unit spaces by the physical model.

Abstract: There is provided a novel throttle valve controller device for an internal combustion engine that is capable of accurately producing a target torque for the internal combustion engine. The present invention includes a target fresh intake air flow rate calculating section that calculates a target fresh intake air flow rate passing through a throttle valve, an EGR gas flow rate calculating section that calculates an estimated EGR gas flow rate passing through the throttle valve, a target throttle intake gas flow rate calculating section that calculates a target intake gas flow rate passing through the throttle valve on the basis of the target fresh intake air flow rate and the estimated EGR gas flow rate, and a target throttle valve opening calculating section that calculates a target throttle valve opening from the target intake gas flow rate.

Abstract: Provided is a novel control device of an internal combustion engine capable of estimating an EGR rate in a transient state with high accuracy. Thus, in the present invention, unit spaces are formed by dividing a reference space of the intake passage into a plurality of spaces along a streamline through which the gas mixture of the intake air and the EGR gas flows, a physical model based on an advection equation for estimating the EGR rate of the gas mixture is established so as to correspond to each of the unit spaces, and the EGR rate at which the gas mixture flows into the combustion chamber is estimated by sequentially estimating the EGR rates of the unit spaces connected to head unit spaces from the head unit spaces by the physical model.

Abstract: The present invention relates to a control device and a control method for an engine that includes a compression ratio variable mechanism for changing a top dead center position of a piston and a fuel injector for directly injecting a fuel into a cylinder. In the control device and the control method for the engine according to the invention, when a compression ratio is increased by the compression ratio variable mechanism, an injection timing, a fuel pressure, the number of times of split injections, and the like, in a fuel injection of the fuel injector are changed, to reduce a fuel adhering to a piston crown surface.

Abstract: The present invention relates to a control device and a control method for an engine that includes a compression ratio variable mechanism for changing a top dead center position of a piston and a fuel injector for directly injecting a fuel into a cylinder. In the control device and the control method for the engine according to the invention, when a compression ratio is increased by the compression ratio variable mechanism, an injection timing, a fuel pressure, the number of times of split injections, and the like, in a fuel injection of the fuel injector are changed, to reduce a fuel adhering to a piston crown surface.

Abstract: In an internal combustion engine equipped with a variable compression ratio mechanism, the occurrence of knocking is reduced during deceleration. When it is determined that a target compression ratio of the variable compression ratio mechanism is greater than a threshold PRSL during the deceleration, an air bypass valve interposed in a passage for bypassing a compressor of an exhaust turbo supercharger is opened to return intake air upstream (between the compressor and a throttle valve) of the throttle valve to upstream of the compressor, thereby reducing intake pressure upstream of the throttle valve and reducing in-cylinder compression pressure to reduce the occurrence of knocking.

Abstract: An anomaly in a high-pressure fuel system of an internal combustion engine is diagnosed early on and with high precision, and, further, the anomaly site is identified.

Abstract: When the opening of a throttle valve provided in an intake system of an engine with a supercharger is substantially fully opened, an electronic control unit estimates atmospheric pressure based on intake air pressure in the downstream of the throttle valve at the time of start of supercharging by the supercharger. Here, the meaning that the opening of the throttle valve is substantially fully opened includes such a state that the opening becomes equal to or greater than a predetermined opening and hence is considered to be approximately fully opened, as well as the state that the opening of the throttle valve is 100% (full throttle).

Abstract: An anomaly in a high-pressure fuel system of an internal combustion engine is diagnosed early on and with high precision, and, further, the anomaly site is identified.

Abstract: Any anomaly in energy transfer is appropriately diagnosed in a vehicle. The energy transfer system of a vehicle is provided with: an input energy computation means (e.g., the chemical energy of fuel computation means) for determining the input energy of the energy transfer system; an output energy computation means (e.g., the vehicle kinetic energy computation means) for determining the energy output of the energy transfer system; and a comparing means (e.g., the comparing means) for comparing the input energy with the output energy. Any anomaly in the energy transfer system (e.g., any anomaly in fuel efficiency) is determined based on the result of comparison by the comparing means.

Abstract: A control apparatus for an internal combustion engine has an oxygen storage volume computing unit for computing an oxygen storage volume of a catalyst by using a real air/fuel ratio detected by an air/fuel ratio sensor installed on the upstream side of a catalyst, a center air/fuel ratio representing a stoichiometric air/fuel ratio and an estimated air flow volume or detecting a flow rate of air flowing into the catalyst. A center air/fuel ratio correcting unit for correcting a center air/fuel ratio based on output of a rear air/fuel ratio sensor provided on the downstream side of the catalyst, and an oxygen storage volume computed by an oxygen storage volume computing unit, and the oxygen storage volume computing unit computes an oxygen storage volume by using a center air/fuel ratio corrected by the center air/fuel ratio correcting unit.

Abstract: An engine control apparatus controls changeover of a combustion mode in an engine in which each cylinder has an injector that can perform fuel injection a predetermined number of times for each cylinder combustion. A control unit controls fuel injection and ignition timing from a spark plug. Upon combustion mode changeover from a first combustion mode, in which fuel injection is performed at least once for each cylinder combustion, to a second combustion mode, in which fuel injection is performed a greater number of times with a larger intake air volume than the first combustion mode, the control unit performs the steps of changing in the first combustion mode a target intake air volume required in the second combustion mode; retarding the ignition timing; changing to the second combustion mode; and further retarding the ignition timing.

Abstract: In a diagnosis apparatus for an internal combustion engine which determines the abnormality of a linear A/F sensor which is disposed on the upstream side of a catalyst of the engine and detects the A/F of exhaust gas, the apparatus includes a response/gain deterioration detection unit that separately detects the response deterioration in which the response of the linear A/F sensor is delayed and the gain deterioration in which the detection sensitivity of the linear A/F sensor is abnormal.

Abstract: There is provided a control apparatus for a cylinder injection internal combustion engine which suppresses fuel pulsation caused by cam phase deviation and thereby prevents internal combustion engine exhaust deterioration, so that the reliability of a high-pressure fuel system using a high-pressure fuel pump is improved. The control apparatus for a cylinder injection internal combustion engine includes a high-pressure fuel pump that raises the pressure of fuel and discharges the fuel to a fuel rail, and a fuel pressure sensor that detects a pressure of fuel stored in the fuel rail. The control apparatus controls the high-pressure fuel pump based on the fuel pressure detected by the fuel pressure sensor.

Abstract: A control apparatus for an internal combustion engine has an oxygen storage volume computing unit for computing an oxygen storage volume of a catalyst by using a real air/fuel ratio detected by an air/fuel ratio sensor installed on the upstream side of a catalyst, a center air/fuel ratio representing a stoichiometric air/fuel ratio and an estimated air flow volume or detecting a flow rate of air flowing into the catalyst. A center air/fuel ratio correcting unit for correcting a center air/fuel ratio based on output of a rear air/fuel ratio sensor provided on the downstream side of the catalyst, and an oxygen storage volume computed by an oxygen storage volume computing unit, and the oxygen storage volume computing unit computes an oxygen storage volume by using a center air/fuel ratio corrected by the center air/fuel ratio correcting unit.

Abstract: A diagnosis apparatus for an internal combustion engine equipped with a cold start emission reduction strategy unit, includes: a temperature measuring unit for detecting a temperature of coolant of the internal combustion engine; a temperature estimating unit for calculating an estimated temperature of the coolant in accordance with a running state of the internal combustion engine; and a cold start emission reduction strategy abnormality judging unit for judging abnormality of the cold start emission reduction strategy unit in accordance with the temperature detected with the coolant temperature measuring means and the estimated temperature.

Abstract: A diagnostic apparatus is combined with a high-pressure fuel supply system including a high-pressure fuel pump, a fuel rail, injectors, and a fuel pressure measuring unit for measuring fuel pressure in the fuel rail. The diagnostic apparatus is capable of detecting troubles in the high-pressure fuel pump and injectors and of discriminating between a trouble in the high-pressure fuel pump and a trouble in the injectors includes.

Abstract: A control apparatus for an internal combustion engine has an oxygen storage volume computing unit for computing an oxygen storage volume of a catalyst by using a real air/fuel ratio detected by an air/fuel ratio sensor installed on the upstream side of a catalyst, a center air/fuel ratio representing a stoichiometric air/fuel ratio and an estimated air flow volume or detecting a flow rate of air flowing into the catalyst. A center air/fuel ratio correcting unit for correcting a center air/fuel ratio based on output of a rear air/fuel ratio sensor provided on the downstream side of the catalyst, and an oxygen storage volume computed by an oxygen storage volume computing unit, and the oxygen storage volume computing unit computes an oxygen storage volume by using a center air/fuel ratio corrected by the center air/fuel ratio correcting unit.

Abstract: The present invention reduces exhaust emissions at startup, provides improved fuel pressure control performance in a low-load region, and detects high-pressure fuel system abnormalities. Disclosed is a high-pressure fuel system control device which includes a high-pressure pump for pressurizing fuel and discharging the pressurized fuel to a fuel rail, an injector for injecting the fuel stored in the fuel rail, and a fuel pressure sensor for measuring the pressure of the fuel stored in the fuel rail, and controls the high-pressure pump and the injector in accordance with an output generated from the fuel pressure sensor.

Abstract: A diagnostic device and method of an engine exhaust purifying system, which perform active control of an air-fuel ratio and can make diagnosis of air-fuel ratio sensors, catalysts, etc. in the engine exhaust purifying system with high accuracy and reliability while avoiding a worsening of exhaust emissions, an increase of revolution variations, etc.