Air conditioner for a vehicle and controlling method thereof

Abstract

An object of the present invention is to provide an air conditioner and a controlling method thereof capable of effectively conditioning air in an operator cab of a vehicle even if a windshield or door of the operator cab is opened. An air conditioner for conditioning air in an operator cab of a vehicle comprises: a first blowout port for blowing out the conditioned air to a front of the operator; a second blowout port for blowing out the conditioned air; an open/close sensor for detecting whether the operator cab is opened or closed; and an air volume ratio adjustment unit for setting a ratio of the volume of the conditioned air, which is blown out from the first blowout port when the open/close sensor detects that the operator cab is opened to be higher than the ratio when the operator cab is closed.

1 . An air conditioner for conditioning air in an operator cab of a vehicle comprising:
 an air-conditioning unit for generating conditioned air;   a first blowout port for blowing out conditioned air to a front of the operator;   a second blowout port for blowing out the conditioned air;   an open/close sensor for detecting whether said operator cab is opened or closed; and   an air volume ratio adjustment unit for setting a ratio of the volume of the conditioner air, which is blown out from said first blowout port, to the volume of the conditioned air, which is blown out from said first and said second blowout port, when said open/close sensor detects that said operator cab is opened, to be higher than the ratio of the volume of the conditioner air when said operator cab is closed.   
   
   
       2 . An air conditioner according to  claim 1 , further comprising an air volume setting unit for setting the volume of the conditioned air which is blown out from said first and second blowout port, so that the volume of the conditioned air which is blown out from said first blowout port when said open/close sensor detects that said operator cab is opened, is larger than the volume of the conditioned air which is blown out from said first blowout port when said operator cab is closed. 
   
   
       3 . An air conditioner according to  claim 1 , further comprising a temperature adjustment unit for setting a temperature of the conditioned air so that the temperature of the conditioned air, which is blown out from said first blowout port when said open/close sensor detects that said operator cab is opened, is lower than the temperature of the conditioned air when said operator cab is closed. 
   
   
       4 . An air conditioner according to  claim 1 , wherein said second blowout port is arranged at the rear of an operator's seat. 
   
   
       5 . An air conditioner according to  claim 4 , wherein said air volume ratio adjustment unit sets the ratio of volume of the conditioned air so that when said open/close sensor detects that said operator cab is opened, the volume of the conditioned air which is blown out from said first blowout port, is equal or larger than the volume of the conditioned air which is blown out from said second blowout port, and when said open/close sensor detects that said operator cab is closed, the volume of the conditioned air which is blown out from said first blowout port, is smaller than the volume of the conditioned air which is blown out from said second blowout port. 
   
   
       6 . An air conditioner according to  claim 1 , further comprising a temperature sensor for measuring a temperature of air in said operator cab or a temperature of air out said operator cab, wherein
 the air volume ratio adjusting unit sets the ratio of volume of the conditioned air when said open/close sensor detects that said operator cab is opened and the measured temperature of the outside air or the inside air is equal or higher than a predetermined temperature, to be higher than the ratio of volume of the conditioned air when said operator cab is closed.   
   
   
       7 . An air conditioner according to  claim 1 , wherein said vehicle is a construction vehicle. 
   
   
       8 . A method of controlling an air conditioner for conditioning air in an operator cab of a vehicle, the air conditioner comprising an air conditioning unit for generating conditioned air, a first blowout port for blowing out the conditioned air to a front of the operator and a second blowout port for blowing out the conditioned air,
 the method comprising:   detecting whether said operator cab is opened or closed; and   setting a ratio of volume of the conditioned air which is blown out from said first blowout port, in the conditioned air which is blown out from each blowout port, so that the ratio of volume of the conditioned air when it is detected that said operator cab is opened, is higher than the ratio of volume of the conditioned air when it is detected that said operator cab is closed.