Abstract: A variable valve-operating system for an internal combustion engine, comprising a cylinder head having an intake or exhaust valve, a camshaft rotatably supported by the cylinder head, a cam body rotatably fitted around the camshaft and including a cam lobe having an outer peripheral surface for driving the valve and a boss protruding radially from the cam body, and a valve open period-varying mechanism supported on the camshaft and including an intermediate rotating member having a center of rotation offset from the camshaft, the mechanism transmits rotation of the camshaft to the boss of the cam body through the intermediate rotating member and also permits the valve open period of the valve to be varied through adjustment of the eccentric phase angle of the intermediate rotating member, wherein at least a part of the boss is so positioned as to overlap with the profile of a nose of the cam lobe when viewed in the axial direction of the cam body.

Abstract: A stator of an electric motor includes teeth, coils each wound about one of the teeth, and a yoke. Each tooth includes a tooth main body and a tooth reinforcing portion, which is integrally molded with at least a part of the surface of the tooth main body. The tooth main portions are formed a powder magnetic core material. The tooth reinforcing portions have a higher mechanical strength than that of the tooth main bodies. The yoke has fitting openings each receiving one of the teeth. Each tooth is fitted to the corresponding fitting opening in such a manner that the tooth reinforcing portion contacts a wall surface that defines the fitting opening.

Abstract: An engine includes an electric supercharger as a first supercharger, a turbocharger as a second supercharger, a secondary air supply passage, a secondary air valve and a catalyst. The electric supercharger is provided in an intake passage which is in communication with a combustion chamber, and supercharges intake air into the combustion chamber. The turbocharger is provided in the intake passage in series with respect to the electric supercharger, and supercharges intake air to the combustion chamber. The secondary air supply passage and the secondary air valve supply air compressed by the electric supercharger to a discharge passage which is in communication with the combustion chamber. The catalyst is provided in the discharge passage to purify exhaust gas.

Abstract: A variable valve mechanism for an internal combustion engine includes a rocker arm, a swing cam, and a transmission member which is interposed between the swing cam and a cam and transmits the displacement of the cam to the swing cam. The rocker arm is provided with a rolling roller member which includes a inner ring, an outer ring, and a plurality of rolling elements accommodated between the inner ring and the outer ring. The outer ring contacts with the swing cam. At least one of a first transmission part, in which the displacement of the cam is transmitted from the cam to the transmission member, and a second transmission part, in which the displacement of the cam is transmitted from the transmission member to the swing cam, includes a sliding roller member, wherein a sliding bearing mechanism is constituted between the sliding roller member and the support part.

Abstract: A stator of an electric motor includes teeth, coils each wound about one of the teeth, and a yoke. Each tooth includes a tooth main body and a tooth reinforcing portion, which is integrally molded with at least a part of the surface of the tooth main body. The tooth main portions are formed a powder magnetic core material. The tooth reinforcing portions have a higher mechanical strength than that of the tooth main bodies. The yoke has fitting openings each receiving one of the teeth. Each tooth is fitted to the corresponding fitting opening in such a manner that the tooth reinforcing portion contacts a wall surface that defines the fitting opening.

Abstract: In one coordinate system of arbitrary rectangular coordinate systems including a coordinate system in which the position of a stator is fixed, a coordinate system in which the position of a rotor is fixed, and a coordinate system which rotates at a rotational frequency which is n times (n is an integer which is not 0 or 1) that of the rotor, a filter on any other coordinate system is defined. Further, driving of a motor is controlled by utilizing this filter. As a result, a coordinate transformation operation need not be individually performed with respect to control variables.

Abstract: A drive control apparatus, which controls an AC motor subjected to rotational drive by applying a rectangular wave voltage thereto, comprising: an actual torque detection section for detecting an actual torque value T outputted from the AC motor; an estimated torque calculation section for calculating an estimated torque value Tm based on a motor model with the AC motor in a simulated state; and a voltage phase calculation section wherein the voltage phase calculation section calculates a first voltage phase ?fb based on the actual torque value T and a command torque value T*, and a second voltage phase ?ff based on the estimated torque value Tm and the command torque value T* respectively, and outputs a value obtained by making the voltage phase subjected to weighting addition, as a voltage phase ?v.

Abstract: A switching operation of two switching elements is controlled by a controller. Specifically, by adjusting the duty ratio concerning the lower switching element, a capacitor voltage is controlled to a target value. This control is executed not only by simply performing a PI control with respect to the capacitor voltage based on a deviation from the target value, but also by performing feedback control with respect to battery power and output energy. Further, a scheduling factor based on battery voltage, capacitor voltage, and the like is employed to control the gain of the feedback control.

Abstract: In one coordinate system of arbitrary rectangular coordinate systems including a coordinate system in which the position of a stator is fixed, a coordinate system in which the position of a rotor is fixed, and a coordinate system which rotates at a rotational frequency which is n times (n is an integer which is not 0 or 1) that of the rotor, a filter on any other coordinate system is defined. Further, driving of a motor is controlled by utilizing this filter. As a result, a coordinate transformation operation need not be individually performed with respect to control variables.

Abstract: In one coordinate system of arbitrary rectangular coordinate systems including a coordinate system in which the position of a stator is fixed, a coordinate system in which the position of a rotor is fixed, and a coordinate system which rotates at a rotational frequency which is n times (n is an integer which is not 0 or 1) that of the rotor, a filter on any other coordinate system is defined. Further, driving of a motor is controlled by utilizing this filter. As a result, a coordinate transformation operation need not be individually performed with respect to control variables.

Abstract: There is provided a valve timing control apparatus for an engine, which comprises a variable valve mechanism capable of varying at least one of an opening timing of intake valves and a closing timing of exhaust valves in an engine, an elapsed time detecting device that detects a time period elapsed after cold-starting of the engine, and a timing control device that controls the variable valve mechanism. The timing control device provides advance angle control such that the opening timing of the intake valves and/or the closing timing of the exhaust valves is advanced to be earlier than an exhaust top dead center until the elapsed time period detected by the elapsed time detecting device has reached a predetermined time period.

Abstract: A variable valve timing controller includes an intake-valve and an exhaust-valve. When the engine is started, the intake-valve and the exhaust-valve are operated in a first mode in which the exhaust-valve is closed before top dead center and then the intake-valve is opened. When a first predetermined condition is met, the intake-valve and the exhaust-valve are operated in a second mode in which the opening time of the intake-valve in the first mode is advanced before top dead center.

Abstract: An engine includes an electric supercharger as a first supercharger, a turbocharger as a second supercharger, a secondary air supply passage, a secondary air valve and a catalyst. The electric supercharger is provided in an intake passage which is in communication with a combustion chamber, and supercharges intake air into the combustion chamber. The turbocharger is provided in the intake passage in series with respect to the electric supercharger, and supercharges intake air to the combustion chamber. The secondary air supply passage and the secondary air valve supply air compressed by the electric supercharger to a discharge passage which is in communication with the combustion chamber. The catalyst is provided in the discharge passage to purify exhaust gas.

Abstract: In one coordinate system of arbitrary rectangular coordinate systems including a coordinate system in which the position of a stator is fixed, a coordinate system in which the position of a rotor is fixed, and a coordinate system which rotates at a rotational frequency which is n times (n is an integer which is not 0 or 1) that of the rotor, a filter on any other coordinate system is defined. Further, driving of a motor is controlled by utilizing this filter. As a result, a coordinate transformation operation need not be individually performed with respect to control variables.

Abstract: A switching operation of two switching elements is controlled by a controller. Specifically, by adjusting the duty ratio concerning the lower switching element, a capacitor voltage is controlled to a target value. This control is executed not only by simply performing a PI control with respect to the capacitor voltage based on a deviation from the target value, but also by performing feedback control with respect to battery power and output energy. Further, a scheduling factor based on battery voltage, capacitor voltage, and the like is employed to control the gain of the feedback control.

Abstract: A drive control apparatus, which controls an AC motor subjected to rotational drive by applying a rectangular wave voltage thereto, comprising: an actual torque detection section for detecting an actual torque value T outputted from the AC motor; an estimated torque calculation section for calculating an estimated torque value Tm based on a motor model with the AC motor in a simulated state; and a voltage phase calculation section wherein the voltage phase calculation section calculates a first voltage phase ?fb based on the actual torque value T and a command torque value T*, and a second voltage phase ?ff based on the estimated torque value Tm and the command torque value T* respectively, and outputs a value obtained by making the voltage phase subjected to weighting addition, as a voltage phase ?v.

Abstract: There is provided a valve timing control apparatus for an engine, which comprises a variable valve mechanism capable of varying at least one of an opening timing of intake valves and a closing timing of exhaust valves in an engine, an elapsed time detecting device that detects a time period elapsed after cold-starting of the engine, and a timing control device that controls the variable valve mechanism. The timing control device provides advance angle control such that the opening timing of the intake valves and/or the closing timing of the exhaust valves is advanced to be earlier than an exhaust top dead center until the elapsed time period detected by the elapsed time detecting device has reached a predetermined time period.

Abstract: An electronic control unit adjusts an electronic throttle valve to a starting opening in a cold start mode of an engine, then maintains the opening of the electronic throttle valve so that an engine rotational speed detected by a crank angle sensor increases to a target rotational speed, and increases the opening of the electronic throttle valve and retards an ignition timing if the engine rotational speed is increased above the target rotational speed.

Abstract: Two inverters (INV1, INV2) supply phase currents to three-phase coils (Y1, Y2). Although two phase currents must conventionally be measured and four current sensors are thus required, according to the present invention, the number of phase currents to be measured is reduced as a result of use of an observer for phase current estimation.

Abstract: An idle speed control apparatus for an internal combustion engine is provided which, when the internal combustion engine is started in a cold mode, provides ignition timing engine speed control (m1) such that ignition timing in which said ignition driving device performs ignition in the internal combustion engine is retarded and the engine speed of the internal combustion engine is controlled to the target engine speed, and then provides intake air quantity engine speed control (m2) such that the engine speed of the internal combustion engine is feedback-controlled to the target engine speed by controlling the intake air quantity of the internal combustion engine. As a result, it is possible to prevent the exhaust gas temperature from being increased insufficiently due to a deficiency in retard angle, and to prevent the activation of a catalytic converter from being delayed.