Air conditioner for vehicle capable of preventing inverter overheating

An air conditioner and overheating technology, which is applied to irreversible cycle compressors, vehicle components, air handling equipment, etc., can solve the problems of motor drive unit temperature rise, pressure rise, and refrigerant flow path damage
CN100432432CActive Publication Date: 2008-11-12DENSO CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
DENSO CORP
Publication Date
2008-11-12

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Abstract

An inverter 6 that drives an electric motor 4 of the electric compressor 3 operates in a protection-against-overheat mode, in which the electric motor is driven at a rotational speed for protection against heat different from a rotational speed specifying value from an air conditioning control unit 20 , in order to ensure the flow rate of the refrigerant and cool the inverter itself when the temperature detected by an inverter temperature sensor 22 g exceeds a predetermined value. At this time, if the refrigerant pressure increases or the evaporator discharge temperature falls, the air conditioning control unit stops the protection-against-overheat mode operation of the inverter and directs the inverter to forcedly stop the electric motor. Due to this, an excessive increase in the refrigerant pressure and evaporator freezeing can be prevented, and thus the function of the refrigerating cycle can be protected.
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Description

technical field

[0001] The present invention relates to a vehicle air conditioner having a protection function of protecting a cooling system by using an electric compressor. Background technique

[0002] According to the prior art, the electric compressor in the known vehicle air conditioner has a compressor for absorbing and discharging refrigerant, a compressing part for compressing the sucked refrigerant into the compressor, an electric motor for driving the compressing part, and a motor for driving and controlling the compressor. A motor-driven unit of an electric motor, the known air conditioner is used in a refrigeration cycle with a condenser, a pressure reducing device and an evaporator.

[0003] In such a vehicle air conditioner, the temperature of the motor drive unit that drives and controls the motor compressor rises due to the heat generated by the motor drive unit's own operation and the heat discharged from other heat sources such as the engine, and includes ...

Claims

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