公开(公告)号：US06330802B1

公开(公告)日：2001-12-18

申请号：US09510703

申请日：2000-02-22

申请人： Robert W. Cummings ,  Thien D. Ta

发明人： Robert W. Cummings ,  Thien D. Ta

IPC分类号： F25B4902

CPC分类号： B60H1/00978 ,  B60H1/3225 ,  F25B49/005 ,  F25B2500/222 ,  F25B2700/195 ,  F25B2700/21174 ,  F25B2700/21175

摘要： A method for detecting a low level of refrigerant circulating through a motor vehicle refrigerant circuit having a compressor (12), a condenser (14), an evaporator (16), and an accumulator (18), includes detecting a partial loss of a refrigerant fluid by measuring the temperature difference of the refrigerant fluid between an evaporator inlet and an evaporator outlet. The method further includes detecting a complete loss of refrigerant by measuring the pressure of the refrigerant in the liquid phase between the condenser (14) and the evaporator (16). The temperature and pressure measurements are converted to engineering units and then compared to predetermined engineering units that correspond to separate ranges of ambient temperatures for determining the if the refrigerant level is low.

摘要翻译： 一种用于检测通过具有压缩机（12），冷凝器（14），蒸发器（16）和蓄能器（18）的机动车辆制冷剂回路循环的低水平制冷剂的方法，包括检测制冷剂的部分损失 流体，通过测量蒸发器入口和蒸发器出口之间的制冷剂流体的温差。 该方法还包括通过测量在冷凝器（14）和蒸发器（16）之间的液相中的制冷剂的压力来检测制冷剂的完全损失。 将温度和压力测量值转换为工程单位，然后与对应于单独的环境温度范围的预定工程单位进行比较，以确定制冷剂水平是否低。