Abstract: An object of the invention is to provide a technique for excellently controlling a supercharger equipped with an electric motor. A supercharging system for an internal combustion engine according to the present invention is provided with a supercharger equipped with an electric motor, where rotation of the rotary shaft of the supercharger is assisted by the electric motor, and control unit for controlling assisting force of said electric motor in such a way that the rotation speed of the supercharger becomes a target rotation speed.

Abstract: The purpose of the present invention is providing a supercharging system which uses both of a mechanism such as VN or the like and an electric motor generating an assist force while making the supercharger operate smoothly when the assist by the electric motor is stopped. The system controls the electric motor in a feedback manner so that enough assist force is generated (FIG. 2A and FIG. 2B) while controlling the VN in an open manner (FIG. 2D) until status of the supercharger reaches target status (time t1) when an accelerator requirement arises in a low revolution region. The control of the electric motor is changed to an open control, and the control of the VN is changed to a feedback control, respectively, at time t1. The open control of the electric motor is continued so that necessary complement torque occurs until time t2. After time t2, the system maintains the target status only by the feedback control of the VN.

Abstract: An exhaust gas recirculation system includes: a turbocharger (8) that includes a compressor (8a) and a turbine (8b); a throttle valve (7), provided in an intake passage (3) upstream of the compressor (8a); an EGR passage (11) through which a portion of exhaust gas from the exhaust passage (4) is recirculated to the intake passage (3) between the throttle valve (7) and the compressor (8a); and an EGR valve (13) that regulates a flow rate of exhaust flowing in the EGR passage (11). The exhaust gas recirculation system further includes valve control means that controls the opening degree of the throttle valve (7) and the opening degree of the EGR valve (13) so that the pressure in the intake passage (3) between the throttle valve (7) and the compressor (8a) is maintained at or above a predetermined pressure.

Abstract: An air flow amount passing through a centrifugal compressor is acquired on the basis of outputs of an air flow meter. A surge limit compressor rotation speed is acquired on the basis of the obtained air flow amount passing through the compressor. A current compressor rotation speed (turbo rotation speed) is acquired by a turbo rotation speed sensor. A rotation speed of the compressor is controlled on the basis of the surge limit compressor rotation speed and the current compressor rotation speed. More specifically, while being limited so as to be equal or less than the surge limit compressor rotation speed, a target compressor rotation speed is controlled so as to be a value according to the operating conditions, such as accelerator opening and engine speed, of an internal combustion engine. In addition, the surge of the compressor is judged on the basis of the surge limit compressor rotation speed and the current compressor rotation speed.

Abstract: An internal combustion engine to which the inventive device for controlling an internal combustion engine is applied includes an intake control valve provided in an air-intake path at a position upstream from an intake valve, the intake control valve being controlled to be either in an operative state operating in relation to the operation of the intake valve or in an non-operative state maintaining the air-intake path always open, and, in the operative state, closed at least prior to the opening of the intake valve and opened after the opening of the intake valve to generate the pressure difference between the upstream and downstream from the intake control valve.

Abstract: An engine comprises an intake control valve disposed in an intake passage at an upstream side of an intake valve in each cylinder for individually opening/closing the intake passage, an actuator for opening/closing the intake control valve, and a control device for controlling an operation of the actuator, wherein the control device controls the actuator to delay opening of the intake control valve in relation to opening of the intake valve, thus performing the supercharge. Supercharge correction is further performed for correcting operating timing of the actuator so that unbalance in a supercharge air quantity between the cylinders in the engine is suppressed.

Abstract: An internal combustion engine to which the inventive device for controlling an internal combustion engine is applied includes an intake control valve provided in an air-intake path at a position upstream from an intake valve, the intake control valve being controlled to be either in an operative state operating in relation to the operation of the intake valve or in an non-operative state maintaining the air-intake path always open, and, in the operative state, closed at least prior to the opening of the intake valve and opened after the opening of the intake valve to generate the pressure difference between the upstream and downstream from the intake control valve.

Abstract: An air flow amount passing through a centrifugal compressor is acquired on the basis of outputs of an air flow meter. A surge limit compressor rotation speed is acquired on the basis of the obtained air flow amount passing through the compressor. A current compressor rotation speed (turbo rotation speed) is acquired by a turbo rotation speed sensor. A rotation speed of the compressor is controlled on the basis of the surge limit compressor rotation speed and the current compressor rotation speed. More specifically, while being limited so as to be equal or less than the surge limit compressor rotation speed, a target compressor rotation speed is controlled so as to be a value according to the operating conditions, such as accelerator opening and engine speed, of an internal combustion engine. In addition, the surge of the compressor is judged on the basis of the surge limit compressor rotation speed and the current compressor rotation speed.

Abstract: An object of the invention is to provide a technique for excellently controlling a supercharger equipped with an electric motor. A supercharging system for an internal combustion engine according to the present invention is provided with a supercharger equipped with an electric motor, where rotation of the rotary shaft of the supercharger is assisted by the electric motor, and control unit for controlling assisting force of said electric motor in such a way that the rotation speed of the supercharger becomes a target rotation speed.

Abstract: For accurately estimating an air quantity flowing into a cylinder at the time of operating an intake control valve, a control apparatus for an engine according to the present invention is provided with an intake control valve which can open/close an intake passage in synchronization with opening/closing of an intake valve, intake control valve controlling means which opens the intake control valve in the midst of the intake stroke and thereafter, closes the intake control valve, and air quantity estimating means which estimates an air quantity flowing into a cylinder after the intake control valve has opened, based upon opening timing of the intake control valve, closing timing or an opening period of the intake control valve, and a pressure at a downstream side of the intake control valve at the opening timing of the intake control valve.

Abstract: For accurately estimating an air quantity flowing into a cylinder at the time of operating an intake control valve, a control apparatus for an engine according to the present invention is provided with an intake control valve which can open/close an intake passage in synchronization with opening/closing of an intake valve, intake control valve controlling means which opens the intake control valve in the midst of the intake stroke and thereafter, closes the intake control valve, and air quantity estimating means which estimates an air quantity flowing into a cylinder after the intake control valve has opened, based upon opening timing of the intake control valve, closing timing or an opening period of the intake control valve, and a pressure at a downstream side of the intake control valve at the opening timing of the intake control valve.

Abstract: End-mill machining control method and apparatus in which cutting forces tangential and normal to tool motion are detected and machining is controlled based on the detected cutting force values. A primary component Ft and motion axis components Fx, Fy of a cutting force are determined from current values of a spindle motor and motion axis motors for tool feed. A cutting-engaged angle ?en is determined from a radius R of a tool and a depth of cut I into a workpiece. A motion direction angle ? is determined from distribution motion amounts ?X, ?Y to the axes. The cutting forces Fm, Fs tangential and normal to tool motion are determined from the primary component Ft and a motion axis component Fx or Fy whichever is the largest, the cutting-engaged angle ?en, the motion direction angle ?. The accuracy of the determined cutting forces Fm, Fs is high since they are determined from the primary component Ft less affected by disturbance and the largest axis component of the cutting force.

Abstract: An internal combustion engine includes a circulation system which circulates a heat medium, a cylinder head part channel which circulates the heat medium into a cylinder head, a cylinder block part channel which circulates the heat medium into a cylinder block, a connecting channel which connects the cylinder head part channel with the cylinder block part channel, a heat supply device that supplies heat accumulated in the regenerator to the internal combustion engine, and restraining device that restrains heat circulation in the connecting channel when heat is supplied by the heat supply device or the internal combustion engine is under cold conditions.

Abstract: Disclosed is a technology capable of efficiently supplying a heater core 12 or a heat accumulation system 15 or an internal combustion engine body 1 with cooling water heated by a cooling water heating mechanism 20 by restraining an unnecessary heat radiation from the cooling water in an internal combustion engine including the heat accumulation system.

Abstract: The internal combustion engine includes an engine preheating apparatus for preheating the internal combustion engine upon or before starting thereof. This internal combustion engine further includes an air-fuel ratio controller for setting an air-fuel ratio of the internal combustion engine that is preheated, to a value higher than that of the internal combustion engine that is not preheated, and/or an ignition-timing controller for retarding an ignition timing of the internal combustion engine that is preheated as compared with the ignition timing of the internal combustion engine that is not preheated.

Abstract: End-mill machining control method and apparatus in which cutting forces tangential and normal to tool motion are detected and machining is controlled based on the detected cutting force values. A primary component Ft and motion axis components Fx, Fy of a cutting force are determined from current values of a spindle motor and motion axis motors for tool feed. A cutting-engaged angle &agr;en is determined from a radius R of a tool and a depth of cut I into a workpiece. A motion direction angle &bgr; is determined from distribution motion amounts &Dgr;X, &Dgr;Y to the axes. The cutting forces Fm, Fs tangential and normal to tool motion are determined from the primary component Ft and a motion axis component Fx or Fy whichever is the largest, the cutting-engaged angle &agr;en, the motion direction angle &bgr;. The accuracy of the determined cutting forces Fm, Fs is high since they are determined from the primary component Ft less affected by disturbance and the largest axis component of the cutting force.

Abstract: A maximum undeformed chip thickness, a cutting arc length or an engage angle, and an active angle for each tooth of the end mill are calculated when a ball end mill is used in machining, or the maximum undeformed chip thickness, the cutting arc length or the engage angle, and an axial depth of cut for each tooth of the end mill are calculated when a straight end mill is used in machining. Then, the estimated value of the cutting force Fxy or Fxyz in each portion of the tool path is calculated on the basis of a response surface whose explanation variables are composed of the above-mentioned calculated values, whereby the feed rate contained in an equation for the maximum undeformed chip thickness tm is determined to maintain the obtained estimated value of the cutting force Fxy or Fxyz at an appropriate value.

Abstract: An internal combustion engine includes a circulation system which circulates a heat medium, a cylinder head part channel which circulates the heat medium into a cylinder head, a cylinder block part channel which circulates the heat medium into a cylinder block, a connecting channel which connects the cylinder head part channel with the cylinder block part channel, a heat supply device that supplies heat accumulated in the regenerator to the internal combustion engine, and restraining device that restrains heat circulation in the connecting channel when heat is supplied by the heat supply device or the internal combustion engine is under cold conditions.

Abstract: The internal combustion engine includes an engine preheating apparatus for preheating the internal combustion engine upon or before starting thereof. This internal combustion engine further includes an air-fuel ratio controller for setting an air-fuel ratio of the internal combustion engine that is preheated, to a value higher than that of the internal combustion engine that is not preheated, and/or an ignition-timing controller for retarding an ignition timing of the internal combustion engine that is preheated as compared with the ignition timing of the internal combustion engine that is not preheated.

Abstract: An internal combustion engine includes a circulation system which circulates a heat medium, a cylinder head part channel which circulates the heat medium into a cylinder head, a cylinder block part channel which circulates the heat medium into a cylinder block, a connecting channel which connects the cylinder head part channel with the cylinder block part channel, a heat supply device that supplies heat accumulated in the regenerator to the internal combustion engine, and restraining device that restrains heat circulation in the connecting channel when heat is supplied by the heat supply device or the internal combustion engine is under cold conditions.