公开(公告)号：US20180223832A1

公开(公告)日：2018-08-09

申请号：US15506407

申请日：2014-12-17

申请人： Hitachi Industrial Equipment Systems Co., Ltd.

发明人： Zhijia REN ,  Yoshiyuki KANEMOTO

IPC分类号： F04B49/20 ,  F04B49/06

CPC分类号： F04B49/20 ,  F04B35/04 ,  F04B49/06 ,  F04B49/065 ,  F04B49/08 ,  F04B2203/0209 ,  F04B2205/05 ,  F04B2205/063 ,  F04B2207/043 ,  F04B2207/0442

摘要： The purpose of the present invention is to provide an air compressing apparatus capable of establishing a sufficient air-filling rate while reducing noise at the initiation of operations. To solve this problem, in the present invention, the air compressing apparatus comprises a compressor body that compresses air, a motor that drives the compressor body, an inverter that controls the rotation speed of the motor, a control circuit connected to the inverter, and a pressure sensor that detects the pressure of air compressed in the compressor body, wherein the control circuit controls operation of the compressor body by operating at a low speed activation mode that operates the compressor body at a low speed rotational frequency lower than a maximum rotational speed when the air compressing apparatus is activated, and on the basis of a pressure value detected by the pressure sensor and elapsed time from activation, switching from the low speed activation mode to a normal operating mode that operates at variable frequencies including a maximum rotational frequency.

公开(公告)号：US5628188A

公开(公告)日：1997-05-13

申请号：US212804

申请日：1994-03-15

申请人： Rolf Kordak

发明人： Rolf Kordak

IPC分类号： F02D45/00 ,  F04B1/08 ,  F16H61/4096 ,  F16H61/46 ,  F16H61/472 ,  G01M15/04 ,  G01D1/16 ,  G05D17/00

CPC分类号： F16H61/4096 ,  F04B1/08 ,  F16H61/46 ,  F16H61/472 ,  F04B2201/12051 ,  F04B2205/05 ,  F04B2207/0441 ,  F04B2207/0442 ,  F16H2059/6853

摘要： A circuit arrangement for controlling the output torque of a hydrostatic machine connected to a hydraulic system having an impressed operating pressure. The circuit arrangement has a control element for changing the output torque of the machine based upon operating parameters corresponding to pressure, speed, temperature and the like. Control means are supplied with a desired torque value for generating a control signal for actuating the control element. Pick-up means are connected to the control means and to the control element for picking up a pivotal angle .alpha. or an eccentricity E, respectively, representing an actual displacement volume of the hydrostatic machine. The pivotal angle .alpha. and the eccentricity E are measured in either an analog or a digital manner. When measured in an analog manner, the desired value of the pivotal angle is .alpha.=M/P and the desired value of the eccentricity is E=M/P, where M is the torque and P is the pressure. When measured in a digital manner, the desired value for the pivotal angle and the eccentricity, respectively, are determined from previously determined measured values.

摘要翻译： 一种用于控制连接到具有压缩工作压力的液压系统的静液压机器的输出扭矩的电路装置。 电路装置具有用于根据对应于压力，速度，温度等的操作参数改变机器的输出转矩的控制元件。 控制装置被提供有期望的扭矩值，用于产生用于致动控制元件的控制信号。 拾取装置连接到控制装置和控制元件，用于分别拾取表示静液压机器的实际排量的枢轴角α或偏心度E。 枢轴角α和偏心率E以模拟或数字方式测量。 当以模拟方式测量时，枢转角度的期望值为α= M / P，偏心率的期望值为E = M / P，其中M为转矩，P为压力。 当以数字方式测量时，分别根据先前确定的测量值确定枢转角度和偏心率的期望值。