| 摘要 |
A control method controlling a compression capacity of a variable capacity compressor (8), using a capacity control valve (13) which senses a pressure difference between a high pressure (Pd) and a low pressure (Ps) in a refrigeration cycle (7a), including: calculating a target duty factor (Dt1) for the capacity control valve (13) based on a target evaporator-exit temperature (TMeva) and an actual evaporator-exit temperature (Teva); calculating a driving torque (Trq2) of the compressor (8) as an upper-limit driving torque (Trq2) based on a high pressure (Pd) under an assumption that the compressor (8) is in a full-stroke state; calculating an estimated driving torque (Trq1) of the compressor (8) based on an actual control electric current (Isolc); and selecting the target duty factor (Dt1) as an output duty factor (Dtc) when the estimated driving torque (Trq1) is smaller than the upper-limit driving torque (Trq2), and selecting a duty factor (Dt2) calculated based on the upper-limit driving torque (Trq2) as the output duty factor (Dtc) when the estimated driving torque (Trq1) is equal to or larger than the upper-limit driving torque (Trq2).
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