Mitsubishi Heavy Industries Limited

Atsushi Kakino

Hiroshi Saito

Kenta Kawasaki

Takashi Oka

Takashi Miura

Masahiro Toyama

Ports (and) are formed in a port plate (). A plurality of valve plate holes are arranged on a circumference around the rotation axis (S). The port plate () includes a plurality of bridges () configured to divide the port () into a circumferential direction to provide a plurality of port holes (), and a plurality of bridges () configured to divide the port () into the circumferential direction to provide a plurality of port holes (). A summation of the number of port holes () and the number of port holes () is greater than the number of valve plate holes.

Fluid pressure pump

An actuator monitoring system is provided with an electric actuator having a motor and a control unit which outputs a control command (CMD) to the motor to control the operation of the motor. The control unit calculates a use time of the electric actuator based on the control command (CMD) outputted to the motor. Moreover, the control unit estimates the lifetime of the electric actuator based on the calculated use time.

Actuator monitoring system

In a multiple redundant control system each of the control systems detects whether failures occur in the system itself and the other systems, and outputs a control signal corresponding to an amount of control of a controlled object by the control system on the basis of the result of failure detection. In the multiple redundant control system at least one controlled object is driven or controlled by a controller having a plurality of control systems that are connected to each other and each output information regarding the system itself and received input of information regarding other systems. Based on control signals, a main control signal for driving or controlling the controlled object is generated by a main control signal generator.

Multiple redundant control system

A double redundancy electro hydrostatic actuator system includes two hydraulic pumps; two fail safe valves connected with the two hydraulic pumps, respectively; one dual tandem hydraulic cylinder connected with the two fail safe valves and having a piston rod, wherein the piston rod is moved by switching supply and discharge of the fluid; two switching valves connected with the two fail safe valves; two accumulators connected with the two switching valves and the two hydraulic pumps, respectively; and two chambers connected with the two switching valves, respectively. Each of the two accumulators accumulates the fluid from a corresponding one of the two hydraulic pumps, and sends the fluid to a corresponding one of the two fail safe valves. The two chambers receive the fluid from the two fail safe valves, respectively.

Double redundancy electro hydrostatic actuator system

A fluid pressure actuator includes an output cylinder, a fluid pressure pump, an electric motor, a first output cylinder passage, a second output cylinder passage, a return passage and a swash plate control cylinder. The output cylinder includes a first output cylinder chamber, a second output cylinder chamber and an output piston arranged between the first output cylinder chamber and the second output cylinder chamber. The fluid pressure pump includes a first supply and discharge port, a second supply and discharge port and a swash plate for changing displacement of the fluid pressure pump. The electric motor drives the fluid pressure pump. The first output cylinder passage connects the first output cylinder chamber and the first supply and discharge port. The second output cylinder passage connects the second output cylinder chamber and the second supply and discharge port.

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Tokyo, Japan

Atsushi Kakino