Electric Compressor
ELECTRIC COMPRESSOR
Description
COMPONENT DESCRIPTION
Electric Compressor
- The Air Conditioning (A/C) inverter is integrated with the compressor.
- The electric motor is actuated by 3-phase alternating current supplied by the A/C inverter. As a result, the air conditioning control system is actuated without depending on the operation of the engine, thus realizing a comfortable air conditioning system and low fuel consumption.
- Due to the use of an electric compressor, the compressor speed can be controlled at the required speed calculated by the auto amp. Thus, the cooling and dehumidification performance and power consumption have been optimized.
- Low-moisture permeation hoses are used for the suction and discharge hoses at the compressor in order to minimize the entry of moisture into the refrigeration cycle.
- For details on the electric compressor control effected by the auto amp.
- The electric compressor consists of a spirally wound fixed scroll and orbiting scroll that form a pair, a brushless motor, an oil separator, a motor shaft and A/C inverter.
- The fixed scroll is integrated with the housing. Because the rotation of the shaft causes the orbiting scroll to revolve while maintaining the same posture, the volume of the space that is partitioned by both scrolls varies to perform the suction, compression, and the discharge of the refrigerant gas.
- Locating the suction port directly above the scrolls enables direct suction, thus realizing improved suction efficiency.
- Containing a built-in oil separator, this compressor is able to separate the compressor oil that is intermixed with the refrigerant and circulates in the refrigeration cycle, thus realizing a reduction in the oil circulation rate.
- This inverter converts the HV battery's nominal voltage of DC 244.8 V into AC and supplies power to operate the compressor.
Operation
Suction
As the capacity of the compression chamber, which is created between the orbiting scroll and the fixed scroll, increases in accordance with the revolution of the orbiting scroll, refrigerant gas is drawn in from the intake port.
Compression
From the state at which the suction process has been completed, as the revolution of the orbiting scroll advances further, the capacity of the compression chamber decreases gradually. Consequently, the refrigerant gas that has been drawn in becomes compressed gradually and is sent to the center of the fixed scroll. The compression of the refrigerant gas is completed when the orbiting scroll completes approximately 2 revolutions.
Discharge
When the compression of the refrigerant gas is completed and the refrigerant pressure becomes high, the refrigerant gas discharges through the discharge port located in the center of the fixed scroll by pushing the discharge valve.
Component Function Check
1.CONFIRM SYMPTOM BY PERFORMING THE FOLLOWING OPERATIONAL CHECK
1. Turn ignition switch ON (READY).
2. Press AUTO switch and A/C switch.
3. Each switch indicator will turn ON. Confirm that the electric compressor operate. (Discharge air and blower speed will depend on ambient, in-vehicle and set temperatures.)
Does the electric compressor operate?
YES - Inspection End.
NO - Go to Diagnosis Procedure. SEE Diagnosis Procedure.
Diagnosis Procedure
1.CHECK DTC
Check DTC.
Is DTC detected?
YES - Check according to Testing and Inspection.
NO - Inspection End.
2.CHECK REFRIGERANT PRESSURE SENSOR
1. Turn ignition switch ON (READY).
2. Check voltage of refrigerant pressure sensor in "DATA MONITOR". Automatic Air Conditioner.
Is the inspection result normal?
YES - Replace ECM. Special Repair Requirement.
NO - Refrigerant Pressure Sensor.
Component Inspection
REFRIGERANT PRESSURE SENSOR
The refrigerant pressure sensor (1) is attached to the liquid tank.
Make sure that the A/C refrigerant pressure and the sensor output voltage are within the specified range as shown in the A/C operating condition figure. Refrigerant Pressure Sensor.
