2 Delta E Series Inverter Automotive Air Conditioning System Solution
With the continuous development of automotive air-conditioning technology, the technology of compressor evaporators is also constantly improving, and with the increasing demand for energy-saving and environmental protection, Delta's electromechanical industry has taken the lead in the field of motor drive. , providing its variable frequency drive solution in the automotive air conditioning industry. The Delta E-series intelligent frequency converter embedded in the simple PLC has good applicability for the vehicle-passed and economical drive control requirements.
2.1 Inverter refrigeration system
Figure 2 system control chart
The inverter refrigeration system control is shown in Figure 2. The system uses Delta E series 15KW inverter to drive the compressor, and 7.5KW inverter drives the evaporator. The inverter battery collinear bus detects the supply voltage value, and is calculated by the internal PLC program. It is determined that the compressor and the evaporator should work in that state at this time to obtain the output frequency value of the inverter. At the same time, the external PLC detects the returning frequency through the temperature sensor and the temperature value set by the controller to calculate the frequency at which the inverter should work, so that the inverter accelerates or decelerates to adjust the temperature change inside the vehicle to reach the temperature inside the vehicle. The purpose of automatic adjustment.
2.2 Electronic control system design
Since the automotive electrical system is a DC power supply system, the frequency converter should be able to use DC power directly. Delta E Series
The inverter can use the DC bus collinearly, so it can be directly powered by DC. However, considering that it is only using DC power supply, it is recommended that the customer connect the positive and negative terminals to the RT input of the power input of the E series inverter. To prevent the fool, it can also prevent the inverter bus voltage from being recharged.
In addition, if the power supply of the inverter is too high or too low, it will cause a fault alarm, and the voltage of the power system of the car is generally low. Therefore, in order to make the system work normally, the low voltage alarm of the special inverter designed for the automobile air conditioner is accurate. Bit
It will be lower than the standard inverter. The car air conditioning electronic control system is shown in Figure 3. The actual project of the automotive air conditioning electronic control system is shown in Figure 4.
Figure 3 Principle of automotive air conditioning electronic control system
Figure 4 Actual system diagram of car air conditioner
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