Method of controlling electric compressor

Abstract

A method of controlling an electric compressor, includes aligning a position of a rotor after an electric compressor is powered on; determining whether a refrigerant is in a liquid phase or in a gas phase; preheating the refrigerant by applying power to the electric compressor according to the phase of the refrigerant; and controlling the electric compressor wherein the electric compressor is operated after the refrigerant is preheated.

What is claimed is: 
     
         1 . A method of controlling an electric compressor, comprising:
 aligning a position of a rotor after an electric compressor is powered on;   determining whether a refrigerant is in a liquid phase or in a gas phase;   preheating the refrigerant by applying power to the electric compressor according to a phase of the refrigerant; and   controlling the electric compressor wherein the electric compressor is operated after the refrigerant is preheated.   
     
     
         2 . The method according to  claim 1 , wherein the aligning step further comprises setting positions of operation of the rotor and a stator of the electric compressor by applying DC power to the electric compressor for a predetermined amount of time. 
     
     
         3 . The method according to  claim 1 , wherein the determining step further comprises:
 detecting a temperature in the electric compressor; and   detecting a pressure in the electric compressor.   
     
     
         4 . The method according to  claim 3 , wherein the determining step further comprises determining enthalpy data based on the temperature and the pressure in the electric compressor. 
     
     
         5 . The method according to  claim 1 , wherein the preheating step further comprises performing a first preheating for differently controlling an intensity and an application time of DC power applied to the electric compressor. 
     
     
         6 . The method according to  claim 5 , wherein the preheating step further comprises performing a second preheating for uniformly controlling the intensity and the application time of the DC power applied to the electric compressor after the first preheating step. 
     
     
         7 . A method of controlling an electric compressor, comprising:
 aligning a position of a rotor after an electric compressor is powered on;   determining whether a refrigerant is in a liquid phase or in a gas phase;   providing a current state information of the electric compressor for an operator according to the phase of the refrigerant in the electric compressor;   preheating the refrigerant by applying power to the electric compressor according to whether a control command of the operator is present; and   controlling the electric compressor wherein the electric compressor is operated after the refrigerant is preheated.   
     
     
         8 . The method according to  claim 7 , wherein the providing step further comprises:
 communicating with a server through a communication module provided in a mounting object equipped with the electric compressor; and   displaying state information of the refrigerant in the electric compressor on a terminal of the operator.   
     
     
         9 . The method according to  claim 7 , wherein the preheating step further comprises:
 preheating the refrigerant by applying DC power to the electric compressor when the control command is received from the operator; and   providing the current state information of the electric compressor for the operator while repeatedly warning the operator of the current state information for a plurality of times when the operator does not transmit the control command.   
     
     
         10 . The method according to  claim 9 , wherein the preheating the refrigerant by applying DC power step further comprises automatically controlling the electric compressor when the control command is not received from the operator after the providing the state information of the electric compressor for the operator step. 
     
     
         11 . A method of controlling an electric compressor, comprising:
 determining whether a refrigerant in an electric compressor is in a liquid phase or in a gas phase when a vehicle is stopped;   preheating the refrigerant by applying power to the electric compressor according to a phase of the refrigerant, regardless of starting of the vehicle; and   transmitting current state information of the electric compressor to an operator after the refrigerant is preheated.   
     
     
         12 . The method according to  claim 11 , wherein the preheating step further comprises:
 uniformly applying an intensity and an application time of DC power applied to the electric compressor for a predetermined period of time; and   controlling the electric compressor wherein the DC power applied to the electric compressor is powered off after the DC power is applied to the electric compressor for the predetermined period of time.