Control device of compressor, electronic control valve used for same, electric compressor comprising same

Abstract

A control device of a compressor includes a piston which reciprocates by a swash plate, a crankcase receiving the swash plate mounted such that an inclination angle thereof is variable, a discharge chamber from which a compressed working fluid is discharged, a suction chamber sucking the working fluid to be compressed, a first communication channel connecting the suction chamber and the crankcase, a second communication channel connecting the discharge chamber and the crankcase, and a control valve which selectively opens and closes the first communication channel and the second communication channel. The control device includes a suction pressure sensor measuring a pressure of the suction chamber, a valve control unit determining a target suction pressure on the basis of the value measured by the suction pressure sensor and a set temperature, and a valve driving unit controlling the opening degree of the control valve to achieve the target suction pressure.

1 . A control device of a compressor, the control device comprising:
 a piston which reciprocates by a swash plate;   a crankcase for receiving the swash plate which is mounted such that an inclination angle thereof with respect to a rotational shaft is variable;   a discharge chamber from which a compressed working fluid is discharged;   a suction chamber for sucking the working fluid to be compressed;   a first communication channel for connecting the suction chamber and the crankcase,   a second communication channel for connecting the discharge chamber and the crankcase;   a control valve which selectively opens and closes the first communication channel and the second communication channel;   a suction pressure sensor for measuring a pressure of the suction chamber;   a valve control unit for controlling an opening degree of the first communication channel and the second communication channel within the control valve by comparing a measured suction pressure value by the suction pressure sensor and a target suction pressure; and   a valve driving unit for operating an actuator which moves a valve body of the control valve to a determined position from the valve control unit to achieve the target suction pressure.   
     
     
         2 . The control device of  claim 1 , wherein information on an outside air state and on a set temperature of an outlet of an evaporator is provided from a control system of a vehicle air conditioner to the valve control unit. 
     
     
         3 . The control device of  claim 1 , wherein, when cooling is required, the valve control unit sets the target suction pressure to be lower than the measured suction pressure. 
     
     
         4 . The control device of  claim 3 , wherein, when target suction pressure is lower than the measured suction pressure, the valve driving unit increases the opening degree of the first communication channel. 
     
     
         5 . The control device of  claim 4 , wherein, when the first communication channel is at least partially opened, the second communication channel is in a closed state. 
     
     
         6 . The control device of  claim 1 , further comprising a transmitter-receiver for transmitting and receiving a signal to and from a control system of a vehicle air conditioner, wherein the valve control unit and the valve driving unit are provided separately from the control system of the vehicle air conditioner. 
     
     
         7 . The control device of  claim 1 , wherein the valve control unit and the valve driving unit are provided integrally with a control system of a vehicle air conditioner. 
     
     
         8 . The control device of  claim 1 , further comprising:
 a secondary sensing means for sensing at least any one of a discharge pressure, a stroke of the piston, and an operating speed of the compressor; and   a compressor torque management unit which determines torque required to drive the compressor on a basis of the measured suction pressure and information from the secondary sensing means.   
     
     
         9 . The control device of  claim 8 , wherein the valve control unit provides the torque determined to an external control device. 
     
     
         10 . The control device of  claim 1 , further comprising:
 a secondary sensing means for sensing at least any one of a discharge pressure, a stroke of the piston, and an operating speed of the compressor; and   an abnormality detection unit which detects whether the compressor is abnormal or not on a basis of the measured suction pressure and information from the secondary sensing means.   
     
     
         11 . The control device of  claim 8 , wherein the compressor further comprises an electronic clutch means which selectively transmits rotational torque to the rotational shaft, and wherein the control device of the compressor further comprises a clutch control unit which controls an operation of the electronic clutch means by selectively transmitting the rotational torque to the rotational shaft in accordance with the torque determined by the compressor torque management unit. 
     
     
         12 . A control valve comprising:
 a casing in which a space portion is formed therewithin and an electronic actuator is provided on one side end thereof;   a valve body which is mounted to move within the casing;   a first through hole which communicates with the space portion of the casing and a suction chamber of a compressor on which the valve body is mounted;   second and third through holes which communicate with the space portion of the casing and a crankcase of the compressor on which the valve body is mounted; and   a fourth through hole which communicates with the space portion of the casing and a discharge chamber of the compressor on which the valve body is mounted, wherein the second and third through holes are selectively opened and closed while the valve body moves along a longitudinal direction of the valve body.   
     
     
         13 . The control valve of  claim 12 , wherein the first and fourth through holes remain in an open state regardless of a position of the valve body. 
     
     
         14 . The control valve of  claim 13 , further comprising at least one filter which is installed in at least any one of the first and fourth through holes. 
     
     
         15 . The control valve of  claim 12 , wherein the space portion comprises a large diameter portion having a relatively large inner diameter and a small diameter portion having a relatively small inner diameter, and wherein the second through hole disposed relatively adjacent to the first through hole is disposed in the large diameter portion. 
     
     
         16 . The control valve of  claim 15 , wherein the third through hole disposed relatively adjacent to the fourth through hole is disposed in the small diameter portion. 
     
     
         17 . The control valve of  claim 12 , wherein, when the third through hole is at least partially opened, the second through hole remains in a fully closed state. 
     
     
         18 . The control valve of  claim 15 , wherein the valve body comprises a stepped portion facing an interface between the large diameter portion and the small diameter portion, and wherein an internal flow path extending from the stepped portion to an outer surface of the valve body is further formed. 
     
     
         19 . The control valve of  claim 15 , wherein the valve body comprises a tapered surface on a surface facing the second through hole or the third through hole. 
     
     
         20 . A compressor comprising:
 the control valve of  claim 12 ;   a rear housing in which the control valve is received and in which the suction chamber and the discharge chamber are formed respectively;   a cylinder housing which comprises a plurality of cylinder bores radially formed therein and is coupled to the rear housing; and   a front housing which is coupled to the cylinder housing and comprises the crankcase in which a swash plate is disposed therein, wherein a first communication channel which communicates the suction chamber and the crankcase is defined by the cylinder housing, the rear housing, the second through hole, and the first through hole, and a second communication channel which communicates the discharge chamber and the crankcase is defined by the cylinder housing, the rear housing, the fourth through hole, and the third through hole.   
     
     
         21 . The compressor of  claim 20 , wherein the first communication channel and the second communication channel are formed separately and have no overlapping section.