Abstract: To include a carrier-wave generation unit to generate a first carrier wave with a frequency higher than a modulation wave, and a second carrier wave with a frequency lower than the first carrier wave, a comparison unit to compare either the first carrier wave or the second carrier wave to the modulation wave in order to generate a switching signal. The carrier-wave generation unit outputs the second carrier wave when a modulation factor is lower than a threshold value, and outputs the first carrier wave when the modulation factor is equal to or higher than the threshold value. When the modulation factor is equal to or higher than the threshold value, a power conversion unit operates in an overmodulation mode, in which the switching operation is stopped during a period longer than one cycle of the second carrier wave.

Abstract: A fuel injection valve includes a valve housing having an injection hole and a valve seat surface tapering toward a downstream side, a valve component that is accommodated in the valve housing and is coaxially separated from or seated on the valve seat surface, and an elastic component biasing the valve component toward the valve seat surface. The valve component includes an inner convex surface curved in a partial spherical shape with a predetermined curvature radius, and an outer convex surface that is provided continuously to the outer peripheral side of the inner convex surface and curved in a partial spherical shape having a smaller curvature radius than the inner convex surface. A boundary portion between the inner convex surface and the outer convex surface protrudes toward the valve seat surface so as to be able to be separated from or seated on the valve seat surface.

Abstract: A DC/DC conversion device that includes three-level power conversion circuits in a plurality of phases. The DC/DC conversion device includes voltage detectors 21 and 22 that detect at least two voltages (Efc and EfcL) of an input DC voltage, a first divided voltage, and a second divided voltage; and a voltage control unit 3 that controls an output voltage of three-level power conversion circuits 12a and 12b. At least one phase (the power conversion circuit 12b) of the three-level power conversion circuits 12a and 12b operates as an imbalance-reduction phase that executes imbalance-reduction control such that one (EfcL) of the first and second divided voltages is divided into half of the input DC voltage Efc.

Abstract: An exhaust gas purification catalyst is provided for which a purification performance is excellent and particle growth of a catalyst metal is suppressed. The exhaust gas purification catalyst is provided with a substrate and a catalyst layer formed on the substrate. The catalyst layer contains a catalyst metal that functions as an oxidation and/or reduction catalyst and contains a support that supports the catalyst metal. The support is constituted of a porous ceramic that, in its volumetric pore diameter distribution measured based on a nitrogen gas adsorption method, has a pore diameter P10 corresponding to a cumulative 10% from a small pore side and a pore diameter P90 corresponding to a cumulative 90% from the small pore side that are both in a range from 5 to 50 nm.

Abstract: To include a carrier-wave generation unit to generate a first carrier wave with a frequency higher than a modulation wave, and a second carrier wave with a frequency lower than the first carrier wave, a comparison unit to compare either the first carrier wave or the second carrier wave to the modulation wave in order to generate a switching signal. The carrier-wave generation unit outputs the second carrier wave when a modulation factor is lower than a threshold value, and outputs the first carrier wave when the modulation factor is equal to or higher than the threshold value. When the modulation factor is equal to or higher than the threshold value, a power conversion unit operates in an overmodulation mode, in which the switching operation is stopped during a period longer than one cycle of the second carrier wave.

Abstract: A resistance calculation activator determines whether or not an electric car is stopped on the basis of a drive command signal and an external signal, and activates a resistance calculator if a powering command is input as the drive command when it is determined that the electric car is stopped. The activated resistance calculator computes, within a resistance calculation period, a resistance value of an AC motor that produces driving force for the electric car, on the basis of a d-axis voltage command value and a d-axis current value supplied to the AC motor.

Abstract: A motor control apparatus includes a secondary-magnetic-flux-command calculating unit including a minimum-current-secondary-magnetic-flux-command calculating unit that calculates a secondary magnetic flux command for minimizing a current root-mean-square value due to a torque current and an excitation current and a PWM-signal generating unit that generates a torque current command for outputting a desired torque command and an excitation current command for outputting the secondary magnetic flux command, performs vector control such that a q-axis current, which is a detection value of the torque current, and a d-axis current, which is a detection value of the excitation current, respectively coincide with the torque current command and the excitation current command, and generates control signals for turning on and off a switching element in an inverter.

Abstract: The present invention provides an electric vehicle control system that controls power consumption in each electric vehicle in a train configured by a plurality of electric vehicles, which includes: a plurality of power conversion devices, each of which converts power supplied from an overhead line to generate driving power for an AC motor when the train is running, and which convert regenerative power generated by the AC motor to return to the overhead line and determine as to whether the train is in a light load regenerative state when the train uses a regenerative brake; and a plurality of power consuming apparatuses that change an operation mode when at least one of the power conversion devices is in the light load regenerative state.

Abstract: A ground device includes a control unit, a storage unit, and a ground transmitting and receiving unit. A ground antenna is connected to the ground transmitting and receiving unit. Train information from an on-board device is received by the ground transmitting and receiving unit via the ground antenna, and is then transmitted to the control unit. Meanwhile, information from the control unit is transmitted to the on-board device via the ground transmitting and receiving unit and the on-board antenna. The control unit accumulates the train information on a train in the storage unit, and also transmits, to the on-board device, command information for a device installed in the train.

Abstract: A DC/DC conversion device that includes three-level power conversion circuits in a plurality of phases. The DC/DC conversion device includes voltage detectors 21 and 22 that detect at least two voltages (Efc and EfcL) of an input DC voltage, a first divided voltage, and a second divided voltage; and a voltage control unit 3 that controls an output voltage of three-level power conversion circuits 12a and 12b. At least one phase (the power conversion circuit 12b) of the three-level power conversion circuits 12a and 12b operates as an imbalance-reduction phase that executes imbalance-reduction control such that one (EfcL) of the first and second divided voltages is divided into half of the input DC voltage Efc.

Abstract: A control section for controlling a 3-level power conversion circuit. The control section calculates ON voltage error based on time ratios of three potentials in a predetermined certain period and a current value from a current detection section for detecting current outputted from the 3-level power conversion circuit, corrects a voltage command value based on a voltage correction amount for correcting the ON voltage error, and performs ON/OFF control for semiconductor switching elements of the 3-level power conversion circuit based on the corrected voltage command value.

Abstract: The present invention provides an electric vehicle control system that controls power consumption in each electric vehicle in a train configured by a plurality of electric vehicles, which includes: a plurality of power conversion devices, each of which converts power supplied from an overhead line to generate driving power for an AC motor when the train is running, and which convert regenerative power generated by the AC motor to return to the overhead line and determine as to whether the train is in a light load regenerative state when the train uses a regenerative brake; and a plurality of power consuming apparatuses that change an operation mode when at least one of the power conversion devices is in the light load regenerative state.

Abstract: A valve member of a pressure relief valve has a shaft portion, a pressure receiving portion, and a guide portion, wherein the valve member is axially movable in a fuel return passage. When a forward end of the shaft portion is seated on a valve seta, the fuel return passage is closed, while the shaft portion is separated from the valve seat the fuel return passage is opened. A notched portion is formed at an outer wall of the guide portion to thereby form an outer-surface passage. A fuel inlet port is formed in the valve member for communicating a fuel inlet chamber to the fuel return passage at a downstream side of the valve member.

Abstract: In a nozzle management system provided with multiple nozzle management devices, a control device includes a housed nozzle information acquisition section that acquires information related to all suction nozzles housed in multiple nozzle management devices, first determination section that determines whether all the required suction nozzles to be transferred to a nozzle tray are housed in a prescribed nozzle housing device, and a second determination section that determines whether non-housed suction nozzles which are not housed in the prescribed nozzle housing device from among the required suction nozzles are housed in another suction nozzle housing device.

Abstract: A control section for controlling a 3-level power conversion circuit. The control section calculates ON voltage error based on time ratios of three potentials in a predetermined certain period and a current value from a current detection section for detecting current outputted from the 3-level power conversion circuit, corrects a voltage command value based on a voltage correction amount for correcting the ON voltage error, and performs ON/OFF control for semiconductor switching elements of the 3-level power conversion circuit based on the corrected voltage command value.

Abstract: A resistance calculation activator determines whether or not an electric car is stopped on the basis of a drive command signal and an external signal, and activates a resistance calculator if a powering command is input as the drive command when it is determined that the electric car is stopped. The activated resistance calculator computes, within a resistance calculation period, a resistance value of an AC motor that produces driving force for the electric car, on the basis of a d-axis voltage command value and a d-axis current value supplied to the AC motor.

Abstract: An electric-vehicle control device includes a light-load-regeneration control operation unit performing a control operation for returning, to an overhead wire, regenerative power generated by a motor driven by an inverter that converts voltage of a filter capacitor, which accumulates electric power supplied from the overhead wire, into desired alternating-current voltage. The light-load-regeneration control operation unit includes a proportional control system calculating, based on a filter capacitor voltage EFC, VECESL for suppressing regenerative torque of the motor and a regenerative-power control system calculating, based on regenerative power, which is calculated using an overhead wire voltage ES and an overhead wire current IS, and a torque pattern PTRN serving as a torque command, WEFCLMP for suppressing the regenerative torque of the motor, and the regenerative torque of the motor is controlled using output of the sum of VECESL and WEFCLMP as a torque control amount (a torque reduction amount).

Abstract: A motor control apparatus includes a secondary-magnetic-flux-command calculating unit including a minimum-current-secondary-magnetic-flux-command calculating unit that calculates a secondary magnetic flux command for minimizing a current root-mean-square value due to a torque current and an excitation current and a PWM-signal generating unit that generates a torque current command for outputting a desired torque command and an excitation current command for outputting the secondary magnetic flux command, performs vector control such that a q-axis current, which is a detection value of the torque current, and a d-axis current, which is a detection value of the excitation current, respectively coincide with the torque current command and the excitation current command, and generates control signals for turning on and off a switching element in an inverter.

Abstract: An electric-vehicle control device includes a light-load-regeneration control operation unit performing a control operation for returning, to an overhead wire, regenerative power generated by a motor driven by an inverter that converts voltage of a filter capacitor, which accumulates electric power supplied from the overhead wire, into desired alternating-current voltage. The light-load-regeneration control operation unit includes a proportional control system calculating, based on a filter capacitor voltage EFC, VECESL for suppressing regenerative torque of the motor and a regenerative-power control system calculating, based on regenerative power, which is calculated using an overhead wire voltage ES and an overhead wire current IS, and a torque pattern PTRN serving as a torque command, WEFCLMP for suppressing the regenerative torque of the motor, and the regenerative torque of the motor is controlled using output of the sum of VECESL and WEFCLMP as a torque control amount (a torque reduction amount).

Abstract: A control apparatus for an AC rotary machine includes: a current detection section detecting current from a power converter to the AC rotary machine; and a control section generating a three-phase AC voltage instruction to the power converter, based on current detected by the current detection section and a torque instruction. The control section includes: an observer calculating a magnetic flux estimated value of the AC rotary machine, based on detected current and the voltage instruction; a current instruction calculation unit calculating current instruction values on rotational two axes, based on the torque instruction and the magnetic flux estimated value from the observer; and a voltage instruction calculation unit calculating the voltage instruction, based on the current instruction values from the current instruction calculation unit and the magnetic flux estimated value from the observer.