Patent ID: 9702607
Date: 2017-07-11
CPC Classifications: B60H,F25B,Y02B

Claim:
1. An air-conditioner system for a vehicle which comprises: a variable capacity compressor; a condenser for condensing refrigerant discharged from the compressor; an electronic expansion valve which expands the refrigerant discharged from the condenser and is controlled in the degree of opening by a control signal of a controller; and an evaporator for evaporating the refrigerant discharged at the electronic expansion valve and which is controlled to a target superheat degree by a control of the degree of opening of the electronic expansion valve; wherein the controller is configured to change the target superheat degree depending on a variation in an amount of refrigerant discharged from the compressor and control the electronic expansion valve based on the changed target superheat degree; wherein the compressor operates in a variable area to vary the amount of refrigerant discharged and the controller restrains a change in the superheat degree by decreasing the target superheat degree in response to a decrease in the amount of refrigerant discharged from the compressor operating in the variable area; wherein when an amount of refrigerant discharged from the compressor is below a first set value (A), the controller controls the degree of opening of the electronic expansion valve based on a first target superheat degree which is lower than the target superheat degree; and wherein when the amount of refrigerant discharged from the compressor is below a second set value (B), the controller controls the degree of opening of the electronic expansion valve based on a second target superheat degree which is lower than the first target superheat degree; and wherein the controller controls the electronic expansion valve in multiple stages by dropping the target superheat degree by stages as the amount of refrigerant discharged from the compressor decreases.