Mitsubishi Heavy Industries Limited

Mitsubishi Heavy Industries Marine Machinery & Equipment Co., Ltd.

Yoshihisa Ono

Keiichi Shiraishi

Yukio Yamashita

Musashi Sakamoto

Takeshi Tsuji

Yasuhiro Wada

Akihiro Miyanagi

Yoshitsugu Aono

Tadashi Yoshida

Kentaro Hayashi

Koichi Sugimoto

Hiroyuki Hosoya

Yukihiro Iwasa

Hidetaka Nishimura

Fumito Hiratani

Satoshi Makino

Masayoshi Tagawa

Ryoji Sasaki

Yushi Ono

Seokcheol Kim

An impeller back surface cooling structure for cooling a back surface of a compressor impeller of a supercharger includes: a first member facing a back surface of a compressor impeller via a gap; and a second member extending in a circumferential direction of the compressor impeller and forming, between the first member and the second member, a cooling passage through which a cooling medium being a liquid flows.

Impeller back surface cooling structure and supercharger

A hybrid turbocharger includes a first power conversion unit to convert direct-current power into alternating-current power to be output to a generator motor, a smoothing capacitor between direct-current buses, and a control unit that controls the first power conversion unit so as to cause actual generator motor speed to comply with an engine speed command of the generator motor input from an upstream controller during a motoring operation of the generator motor. The control unit changes the engine speed command to a value which is equal to or greater than the actual generator motor speed if the engine speed command of the generator motor is less than the actual generator motor speed and a direct-current bus voltage is equal to or greater than a predetermined first threshold value during the motoring operation. Accordingly, the direct-current bus voltage can be prevented from increasing during the motoring operation.

Marine vessel operated with hybrid turbocharged internal combustion engine

A method of suppressing shaft vibration of a turbocharger capable of being driven by a motor includes: a specific-vibration-state determination step of determining whether a rotor shaft of the turbocharger is in a specific vibration state in which a magnitude of shaft vibration of the rotor shaft is, or is likely to be, greater than a predetermined magnitude; an excited state determination step of determining whether the motor is in an excited state in which an exciting voltage is applied to the motor; and a vibration suppression execution step of applying the exciting voltage to the motor if it is determined that the rotor shaft is in the specific vibration state in the specific-vibration-state determination step and it is determined that the motor is not in the excited state in the excited state determination step.

Vibration suppression method and vibration suppression apparatus for turbocharger capable of being driven by motor

A device and a method for starting an internal combustion engine, provided with an exhaust turbine turbocharger, an electric motor generator, a power storage unit, an engine rotation starter device, injectors, and a control device that controls the electric motor generator, the engine rotation starter device, and the injectors, wherein when an engine rotation activation start signal is input and the rotational frequency of the exhaust turbine turbocharger reaches an engine rotation-activation-starting rotational frequency, the control device starts driving the engine rotation starter device, and when the engine rotational frequency reaches a fuel-supply-starting rotational frequency, the control device starts driving the injectors, thus improving the starting performance of the internal combustion engine.

Device and method for starting internal combustion engine

A noise reduction structure includes a compressor discharge-side pipe portion, a first porous plate having a plurality of through holes and extending circumferentially along an inner circumferential surface of the compressor discharge-side pipe portion so that an air layer is formed between the first porous plate and the inner circumferential surface, a partition dividing an interior of the compressor discharge-side pipe portion in a radial direction in a circumferential direction of the compressor discharge-side pipe portion so as to form a plurality of flow paths in the compressor discharge-side pipe portion, and a second porous plate having a plurality of through holes. The second porous plate is provided in each of the plurality of flow paths and extends along the partition so that an air layer is formed between the second porous plate and the partition.

Noise reduction structure and supercharging device

A method of manufacturing a turbocharger which allows easy performance of assembly operations of a motor rotor and a stator in a motor overhang structural turbocharger is provided. In a method of manufacturing a turbocharger in which a motor is attached to an end portion of a rotor shaft () connected to a compressor portion, the motor includes a cylindrical housing (), a stator () accommodated inside the housing (), and a motor rotor () which is connected to an end portion of the rotor shaft () with permanent magnets rotating inside the stator (), and the method includes a rotor installation step of connecting and attaching the motor rotor () to the rotor shaft (), a housing installation step of fixing and supporting the housing () coaxial to the rotor shaft (), and a stator installation step of using the housing () as a guide, and inserting the stator () into the housing () such that the stator () does not directly come into contact with the motor rotor () to incorporate the stator () into the housing ().

Method of manufacturing turbocharger and turbocharger

According to a device and a method for controlling an internal combustion engine, a control device () enables controllability of the internal combustion engine to be improved by preventing surging from occurring upon starting or stopping of the internal combustion engine, by opening a relief valve () as a turbine rotational speed reaches a surging rotational speed when the control device () causes a motor generator () to assist in rotation of the turbocharger () upon starting of a diesel engine body ().

Internal combustion engine, and device and method for controlling internal combustion engine

A control unit controls a first power converter so as to make the speed of a motor/generator coincide with a prescribed speed command. A speed command (N*) set by an upper stream control system is inputted to a smoothing unit of the control unit. In the smoothing unit, the speed command (N*) is smoothed by a first-order lag element, and the rate of change is limited by a rate limiter to a prescribed value or less. For the speed command (Ns*) outputted from the smoothing unit, the difference (&#x394;N) from the actual speed (N) of the motor/generator is calculated in a difference calculator, a control command (S) based on this difference (&#x394;N) is generated in a control signal generator, and the first power converter is controlled on the basis of this control command (S). Fluctuations in the supply of power to the electric motor are thereby suppressed.

Turbocharger and ship

A hybrid turbocharger includes a first power conversion unit to convert a direct-current power into alternating-current power to be output to a generator motor, a smoothing capacitor between direct-current buses, and a control unit that controls the first power conversion unit so as to cause actual generator motor speed to comply with an engine speed command of the generator motor input from an upstream controller during a motoring operation of the generator motor. The control unit changes the engine speed command to a value which is equal to or greater than the actual generator motor speed if the engine speed command of the generator motor is less than the actual generator motor speed and a direct-current bus voltage is equal to or greater than a predetermined first threshold value during the motoring operation. Accordingly, the direct-current bus voltage can be prevented from increasing during the motoring operation.

Turbocharger and marine vessel

In a power generation facility, there are provided a plurality of diesel engines, a plurality of turbochargers driven by exhaust gas from the diesel engines, a plurality of power generators connected to the plurality of turbochargers, a plurality of converters for converting AC power generated by the plurality of power generators to DC power, one inverter for converting the DC power outputted from the plurality of converters to AC power, and a main controller for controlling the converters in accordance with the AC power from the inverter, by which stable electric power can be generated.

Power generator power generation facility

A hybrid exhaust gas turbocharger is provided, which is capable of preventing the supercharger from being damaged due to a rotary shaft being moved to a large extent in an axial direction by vibration generated from the internal combustion engine and a rotary portion in contact with a stationary portion in the supercharger when the supercharger is mounted on an internal combustion engine. A restraint mechanism () including a thrust collar () attached to a shaft end of a rotary shaft () of a generator positioned on a side opposite to a flexible coupling and two thrust bearings () disposed to oppose both end surfaces forming a flange portion () of the thrust collar () is accommodated in a recess () formed on a front surface side of a shell housing positioned on a side opposite to the casing.

Hybrid exhaust gas turbocharger

A turbo charger generator () generates power with a generator () by driving a gas turbine () and a compressor () with exhaust gas from an internal combustion engine (). The generated AC power is supplied to an electric power system () via a power conversion unit (). The power conversion unit () has a converter () for converting AC power into DC power, a unit () for estimating a rotor rotation angle &#x3b8; based on a rotor magnetic flux, and a control unit () for coordinate-converting AC current into DC current by using the rotor rotation angle &#x3b8; as the reference, and controlling the output DC power of the converter () such that the magnitude of the DC current is maintained at a target DC current value.

Turbo charger generator

A generator housing that accommodates, in the interior thereof, a hollow-cylindrical liner and a stator that is disposed on a radially inner side of the liner has a split-in-two structure that can be divided into two parts at a plane including the rotation axis of the rotation shaft; and individual joints formed inside the generator housing between a pathway and a hole for supplying a cooling medium to the pathway, which is formed inside the liner, and also a hole for exhausting the cooling medium from the pathway are provided with ring-like members that are provided with front surfaces that face the liner and back surfaces that face the generator housing and that have a through-hole that communicates between the hole and the pathway or a through-hole that communicates between the hole and the pathway center portions thereof.

Growing community of inventors

Nagasaki, Japan

Yoshihisa Ono