Abstract: A method of estimating antiknock properties of a multi-fuel injection internal combustion engine includes: acquiring a first antiknock property-correlated parameter value while only a first fuel having a low octane rating is injected in a first load range; estimating a first antiknock property of the first fuel based on the first antiknock property-correlated parameter value; acquiring a second antiknock property-correlated parameter value while the first fuel and a second fuel which has a high octane rating higher than the low octane rating are injected in a second load range higher than the first load range; and estimating a second antiknock property of the second fuel based on the second antiknock property-correlated parameter value and the first antiknock property of the first fuel.

Abstract: An internal combustion engine fuel supply system includes a first fuel tank, a separator, and circuitry. The first fuel tank is to store fuel. The separator is connected to the first fuel tank to separate the fuel supplied from the first fuel tank into a high octane fuel and a low octane fuel which are to be supplied to an internal combustion engine. The high octane fuel has a first octane number. The low octane fuel has a second octane number lower than the first octane number. The circuitry is configured to determine whether fuel has been supplied to the first fuel tank, and to operate the separator to separate the fuel into the high octane fuel and the low octane fuel when it is determined that fuel has been supplied to the first fuel tank.

Abstract: A control device includes first and second level ratio calculators and an adjuster. The first level ratio calculator calculates a first level ratio of an amount of a first fuel stored in a first tank to a full tank capacity of the first tank. The second level ratio calculator calculates a second level ratio of an amount of a second fuel stored in a second tank to a full tank capacity of the second tank. An octane number of the second fuel is higher than an octane number of the first fuel. The adjuster adjusts a first fuel ratio of the first fuel in a supplied fuel which is supplied to an internal combustion engine and a second fuel ratio of the second fuel in the supplied fuel such that a deviation ratio of the first level ratio and the second level ratio is within a predetermined range.

Abstract: A control apparatus for an internal combustion engine, includes circuitry. The circuitry is configured to control a ratio of an amount of low octane number fuel to be supplied to a cylinder to a total amount of the low octane number fuel and a high octane number fuel to be supplied to the cylinder in order to control an overall octane number of fuel to be supplied to the cylinder. The high octane number fuel has a second octane number higher than a first octane number of the low octane number fuel. The circuitry is configured to calculate a maximum octane number of the fuel to be supplied into the cylinder. The circuitry is configured to restrict a power generated by the internal combustion engine based on the maximum octane number.

Abstract: A fuel injection control apparatus for an internal combustion engine having cylinders each of which includes a fuel injection valve and an intake valve, includes an intake valve controller, a parameter acquiring device, and an injection quantity correcting device. The intake valve controller performs an effective-compression-ratio reducing operation. The parameter acquiring device acquires a correction parameter including at least one of a rotational speed of the internal combustion engine, the valve closing timing of the intake valve, and an intake parameter indicating an intake fresh air amount flowing into the cylinders through an intake system. The injection quantity correcting device corrects a fuel injection quantity for the fuel injection valve in accordance with the acquired correction parameter to suppress variations among air/fuel ratios of air fuel mixtures in the cylinders while the intake valve controller performs the effective-compression-ratio reducing operation.

Abstract: Provided is a control device of an internal combustion engine for suppressing variation in the internal EGR amount among cylinders and improving the merchantability. A control device 1 of an internal combustion engine 3 has an ECU 2, wherein the internal combustion engine 3 includes an electric turbocharger 5 and first to fourth cylinders #1 to #4. The ECU 2 sets a target rotation change amount DN#i for a turbine 5b of the electric turbocharger 5 corresponding to each cylinder according to the operation state of the internal combustion engine 3 (Step 35), and controls a TC motor 5c of the electric turbocharger 5 in a control period, which includes an exhaust stroke in one combustion cycle of each cylinder, to match the target rotation change amount DN#i (Step 23).

Abstract: A knocking detector is to detect knocking in the internal combustion engine in which a low-octane fuel is injected into a cylinder and a high-octane fuel whose octane number higher than an octane number of the low-octane fuel is injected into an inlet port. A knocking suppressor includes a first knocking suppressor and a second knocking suppressor. The first knocking suppressor is to increase a high-octane fuel ratio of an injection quantity of the high-octane fuel to a sum of an injection quantity of the low-octane fuel and the injection quantity of the high-octane fuel in order to suppress knocking in the internal combustion engine when the knocking detector detects the knocking. The second knocking suppressor is to suppress knocking of the internal combustion engine at a beginning of a period while the first knocking suppressor increases the high-octane fuel ratio.

Abstract: A method for controlling an internal-combustion engine includes detecting knocking in the internal-combustion engine. An EGR gas quantity of EGR gas is increased in a case where the knocking is detected. A part of exhaust gas is circulated into an intake passage as the EGR gas. A fuel octane number of fuel supplied to a cylinder is increased in the case. The fuel octane number is decreased after the fuel octane number has been increased. The EGR gas quantity is maintained so as to prevent the knocking after the EGR gas quantity has been increased.

Abstract: A control apparatus for an internal combustion engine, includes circuitry. The circuitry is configured to control a ratio of an amount of low octane number fuel to be supplied to a cylinder to a total amount of the low octane number fuel and a high octane number fuel to be supplied to the cylinder in order to control an overall octane number of fuel to be supplied to the cylinder. The high octane number fuel has a second octane number higher than a first octane number of the low octane number fuel. The circuitry is configured to calculate a maximum octane number of the fuel to be supplied into the cylinder. The circuitry is configured to restrict a power generated by the internal combustion engine based on the maximum octane number.

Abstract: A control device for an internal-combustion engine to utilize low octane fuel and high octane fuel having a high octane value higher than a low octane value of the low octane fuel, the control device includes an inclination state sensor and a computer processor. The inclination state sensor detects an inclination state of a high octane fuel tank to store the high octane fuel. The computer processor acquires a remaining quantity of the high octane fuel in the high octane fuel tank. The computer processor restricts a power generated by the internal-combustion engine in accordance with the inclination state and the remaining quantity.

Abstract: An internal combustion engine fuel supply system includes a first fuel tank, a separator, and circuitry. The first fuel tank is to store fuel. The separator is connected to the first fuel tank to separate the fuel supplied from the first fuel tank into a high octane fuel and a low octane fuel which are to be supplied to an internal combustion engine. The high octane fuel has a first octane number. The low octane fuel has a second octane number lower than the first octane number. The circuitry is configured to determine whether fuel has been supplied to the first fuel tank, and to operate the separator to separate the fuel into the high octane fuel and the low octane fuel when it is determined that fuel has been supplied to the first fuel tank.

Abstract: A method for controlling an internal-combustion engine includes detecting knocking in the internal-combustion engine. An EGR gas quantity of EGR gas is increased in a case where the knocking is detected. A part of exhaust gas is circulated into an intake passage as the EGR gas. A fuel octane number of fuel supplied to a cylinder is increased in the case. The fuel octane number is decreased after the fuel octane number has been increased. The EGR gas quantity is maintained so as to prevent the knocking after the EGR gas quantity has been increased.

Abstract: A control device includes first and second level ratio calculators and an adjuster. The first level ratio calculator calculates a first level ratio of an amount of a first fuel stored in a first tank to a full tank capacity of the first tank. The second level ratio calculator calculates a second level ratio of an amount of a second fuel stored in a second tank to a full tank capacity of the second tank. An octane number of the second fuel is higher than an octane number of the first fuel. The adjuster adjusts a first fuel ratio of the first fuel in a supplied fuel which is supplied to an internal combustion engine and a second fuel ratio of the second fuel in the supplied fuel such that a deviation ratio of the first level ratio and the second level ratio is within a predetermined range.

Abstract: A fuel injection control apparatus for an internal combustion engine having cylinders each of which includes a fuel injection valve and an intake valve, includes an intake valve controller, a parameter acquiring device, and an injection quantity correcting device. The intake valve controller performs an effective-compression-ratio reducing operation. The parameter acquiring device acquires a correction parameter including at least one of a rotational speed of the internal combustion engine, the valve closing timing of the intake valve, and an intake parameter indicating an intake fresh air amount flowing into the cylinders through an intake system. The injection quantity correcting device corrects a fuel injection quantity for the fuel injection valve in accordance with the acquired correction parameter to suppress variations among air/fuel ratios of air fuel mixtures in the cylinders while the intake valve controller performs the effective-compression-ratio reducing operation.

Abstract: A knocking detector is to detect knocking in the internal combustion engine in which a low-octane fuel is injected into a cylinder and a high-octane fuel whose octane number higher than an octane number of the low-octane fuel is injected into an inlet port. A knocking suppressor includes a first knocking suppressor and a second knocking suppressor. The first knocking suppressor is to increase a high-octane fuel ratio of an injection quantity of the high-octane fuel to a sum of an injection quantity of the low-octane fuel and the injection quantity of the high-octane fuel in order to suppress knocking in the internal combustion engine when the knocking detector detects the knocking. The second knocking suppressor is to suppress knocking of the internal combustion engine at a beginning of a period while the first knocking suppressor increases the high-octane fuel ratio.

Abstract: A method of estimating antiknock properties of a multi-fuel injection internal combustion engine includes: acquiring a first antiknock property-correlated parameter value while only a first fuel having a low octane rating is injected in a first load range; estimating a first antiknock property of the first fuel based on the first antiknock property-correlated parameter value; acquiring a second antiknock property-correlated parameter value while the first fuel and a second fuel which has a high octane rating higher than the low octane rating are injected in a second load range higher than the first load range; and estimating a second antiknock property of the second fuel based on the second antiknock property-correlated parameter value and the first antiknock property of the first fuel.

Abstract: A controller for internal combustion engine has an intake cam for low-load operation and an intake cam for high-load operation. The controller switches the intake cam used to open/close an intake valve and changes the phase angle of each intake cam according to load on the internal combustion engine. The controller changes the phase angle at start of opening of intake valve by the intake cam for low-load operation in lag angle direction within a predetermined range as load on the internal combustion engine increases, and changes the phase angle at start of opening of intake valve by the intake cam for high-load operation in lead angle direction within the predetermined range as load on the internal combustion engine increases. Switching between the two intake cams is performed where the phase angles of the intake cams are controlled to predetermined phase angles on a lag angle side.

Abstract: A system for separating an ethanol-gasoline blended fuel into gasoline and ethanol-water mixture by mixing water therewith with a lightweight, compact and simple configuration is provided. The system includes a fuel tank for storing a blended fuel; pump means for sucking the blended fuel in the fuel tank, separating the blended fuel into gasoline and ethanol-water mixture by mixing water therewith, and pressure-feeding the separated gasoline and ethanol-water mixture; a separation tank provided inside the fuel tank, and storing the gasoline and the ethanol-water mixture pressure-fed by the pump means in a state separated from each other and in a pressurized state; gasoline drawing means for drawing the gasoline stored in the separation tank via a first on-off valve; and ethanol drawing means for drawing the ethanol-water mixture stored in the separation tank via a second on-off valve.

Abstract: A controller for internal combustion engine has an intake cam for low-load operation and an intake cam for high-load operation. The controller switches the intake cam used to open/close an intake valve and changes the phase angle of each intake cam according to load on the internal combustion engine. The controller changes the phase angle at start of opening of intake valve by the intake cam for low-load operation in lag angle direction within a predetermined range as load on the internal combustion engine increases, and changes the phase angle at start of opening of intake valve by the intake cam for high-load operation in lead angle direction within the predetermined range as load on the internal combustion engine increases. Switching between the two intake cams is performed where the phase angles of the intake cams are controlled to predetermined phase angles on a lag angle side.

Abstract: A HCCI engine (1) is able to supply two types of fuels with different octane numbers to each cylinder (3) through fuel supply devices (17 and 18). A fuel supply control means (50) of a controller (2) increases a proportion of a supplied quantity of a low-octane fuel in the entire supplied quantity of the respective two types of fuels to a combustion chamber greater than a normal proportion defined by a normal control operation value group determined by a predefined control rule according to a FC correction processor (57) in a predefined duration immediately after a return of a working mode from a fuel-cut mode to a normal mode. Thereby, it is able to efficiently perform combustion of the fuel-air mixture in the combustion chamber even after the return of the working mode from the fuel-cut mode to the normal mode when a temperature in the combustion chamber is low.