Patent ID: 8966918
Filing Date: 2015-03-03
Classification: B60H,E02F,F01P,F25D

Abstract:
1. A construction machine comprising: a cab; an air conditioning unit having a condenser, a compressor, an evaporator, a blower fan, and an air conditioning duct, the compressor being connected to the condenser, the evaporator being connected to the condenser and the compressor, the blower fan being configured to blow wind to the evaporator, the air conditioning duct communicating from the evaporator to inside the cab; a radiator configured to cool a refrigerant which circulates in an engine; a cooling fan configured to cool the condenser and the radiator; a hydraulic pump configured to drive the cooling fan, the hydraulic pump being configured to be driven by the engine, the hydraulic pump being a variable capacity type pump; an air conditioning switch configured to switch between operation and non-operation of the compressor; a temperature setting section configured to set a set temperature inside the cab; a room temperature sensor configured to detect a room temperature inside the cab; and a controller configured to control a rotational speed of the cooling fan to be equal to or larger than a predetermined rotational speed upon determining that operation is selected by the air conditioning switch and the room temperature inside the cab is higher than the set temperature, the controller being further configured to control the rotational speed of the cooling fan to be lower than the predetermined rotational speed by setting a pump capacity of the hydraulic pump to a minimum upon determining the non-operation is selected by the air conditioning switch or upon determining the room temperature inside the cab is lower than or equal to the set temperature, the controller being further configured to: