Title:
建設機械
Document Type and Number:
Japanese Patent JP7001574
Kind Code:
B2
Abstract:
To provide a construction machine capable of obtaining a pump flow rate required for operating a hydraulic actuator while preventing deterioration of fuel consumption.SOLUTION: The construction machine comprises: a pump regulator 51a for controlling a discharge flow rate of a variable displacement pump 51; a controller 70 for controlling the pump regulator 51a; pressure sensors 56d and 56e for detecting an operation of an attachment actuator 30d and outputting a detection signal; and an engine ECU 42a for calculating an engine load ratio which is a ratio of an engine 42 to the maximum output at an arbitrary engine speed. The controller 70 comprises a target rotation speed setting unit 72 for setting a target rotation speed of the engine 42 from a first target rotation speed to a second target rotation speed higher than the first target rotation speed when the detection signals output from the pressure sensors 56d and 56e are received, a value of a negative control pressure is smaller than a preset negative control pressure reference value, and a value of an engine load factor is lower than a preset engine load factor reference value.SELECTED DRAWING: Figure 2
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Inventors:
Junya Ono
Application Number:
JP2018209479A
Publication Date:
January 19, 2022
Filing Date:
November 07, 2018
Export Citation:
Assignee:
Yanmar Power Technology Co., Ltd.
International Classes:
E02F9/22; F02D29/00; F02D41/04; F15B11/00; F15B11/02; F15B11/16
Domestic Patent References:
| JP2008223695A | ||||
| JP2001115495A | ||||
| JP2012197696A | ||||
| JP2018071434A | ||||
| JP10252521A | ||||
| JP2018127214A |
Attorney, Agent or Firm:
Patent Business Corporation Sano Patent Office
Patent Business Corporation Unias International Patent Office
Patent Business Corporation Unias International Patent Office
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