公开(公告)号：EP3115570A1

公开(公告)日：2017-01-11

申请号：EP14884758.5

申请日：2014-11-17

Applicant: Hitachi Construction Machinery Co., Ltd.

Inventor： KANEHAMA, Mitsuhiko ,  SATO, Kensuke ,  NAKAMURA, Tsuyoshi

IPC: F01P7/04 ,  E02F9/00 ,  F01P5/04 ,  F01P5/06 ,  F01P11/08 ,  F01P11/14

CPC classification number: E02F9/226 ,  B60Y2200/412 ,  E02F9/00 ,  E02F9/0808 ,  E02F9/2095 ,  E02F9/2292 ,  F01P5/04 ,  F01P7/044 ,  F15B11/08 ,  F15B13/0401 ,  F15B21/042 ,  F16H61/4148

Abstract: The purpose of the present invention is to provide a cooling fan control device for a construction machine, whereby the effects of heat caused by warm-up operation can be suppressed. This cooling fan control device is equipped with a control unit (10a) that controls the rotational speed of a cooling fan (21) in accordance with a main pump discharge pressure (P) detected by a main pump discharge pressure sensor (25), an engine cooling water temperature (Tw) detected by an engine cooling water temperature sensor (26), a hydraulic oil temperature (To) detected by a hydraulic oil temperature sensor (27), and an engine rotational speed (E) detected by an engine rotational speed sensor (28). The cooling fan (21) is rotated at the rotational speed controlled by the control unit (10a), thereby sending the generated cooling air to an oil cooler (19) and a control valve (13).

Abstract translation: 本发明的目的是提供一种用于建筑机械的冷却风扇控制装置，由此可以抑制由预热操作引起的热的影响。 该冷却风扇控制装置配备有根据由主泵排出压力传感器（25）检测到的主泵排出压力（P）来控制冷却风扇（21）的转速的控制单元（10a）， 由发动机冷却水温度传感器（26）检测到的发动机冷却水温度（Tw），由液压油温度传感器（27）检测到的液压油温度（To）和通过发动机转速检测的发动机转速（E） 速度传感器（28）。 冷却风扇21以由控制单元10a控制的转速旋转，从而将产生的冷却空气送到油冷却器19和控制阀13。

公开(公告)号：EP4191073A1

公开(公告)日：2023-06-07

申请号：EP21910026.0

申请日：2021-11-11

Applicant: Hitachi Construction Machinery Co., Ltd.

Inventor： AKITA, Tarou ,  SHIRAKAWA, Yoshihiro ,  OGURA, Kohei ,  KANEHAMA, Mitsuhiko

IPC: F15B11/00 ,  E02F9/22 ,  F15B11/08 ,  F15B11/16 ,  F15B21/0427

Abstract: A work machine includes a flow control valve that controls a flow rate of a hydraulic fluid supplied to a hydraulic actuator, a center bypass line that introduces the hydraulic fluid from a pump through a center bypass passage section of the flow control valve into the tank, a bypass cutoff valve that controls an opening of the center bypass line, a solenoid proportional valve that generates a pilot pressure for controlling the bypass cutoff valve, a pilot valve that generates a pilot pressure for controlling the flow control valve on the basis of an amount of operation of an operation device, and a controller that controls the solenoid proportional valve on the basis of the amount of operation. The controller controls the solenoid proportional valve to reduce an opening area of the bypass cutoff valve according to an increase in the amount of operation in a case the amount of operation is less than a predetermined amount of operation, and controls the solenoid proportional valve to make the opening area of the bypass cutoff valve larger than the minimum opening area in a case the amount of operation is a maximum amount of operation.