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A system includes a compressor and an expansion valve. The exit side of the compressor and the inlet side of the expansion valve are connected by a high pressure conduit, and the exit side of the expansion valve and the inlet side of the compressor are connected by a low pressure conduit. A bypass c

A system includes a compressor and an expansion valve. The exit side of the compressor and the inlet side of the expansion valve are connected by a high pressure conduit, and the exit side of the expansion valve and the inlet side of the compressor are connected by a low pressure conduit. A bypass conduit is connected to the high pressure conduit and the low pressure conduit and a flow rate regulating valve is mounted on the bypass conduit. A control unit controls the expansion valve and the flow rate regulating valve to perform two starting operations in such a way that the flow rate regulating valve is open and the expansion valve is closed in a first starting operation, and the flow rate regulating valve is closed and the electronic expansion valve is open to a predetermined extent in a second starting operation. The compressor is controlled by a duty control signal having a period shorter than a period during a normal operation for starting operations.

대표청구항 ▼

A system includes a compressor and an expansion valve. The exit side of the compressor and the inlet side of the expansion valve are connected by a high pressure conduit, and the exit side of the expansion valve and the inlet side of the compressor are connected by a low pressure conduit. A bypass c

A system includes a compressor and an expansion valve. The exit side of the compressor and the inlet side of the expansion valve are connected by a high pressure conduit, and the exit side of the expansion valve and the inlet side of the compressor are connected by a low pressure conduit. A bypass conduit is connected to the high pressure conduit and the low pressure conduit and a flow rate regulating valve is mounted on the bypass conduit. A control unit controls the expansion valve and the flow rate regulating valve to perform two starting operations in such a way that the flow rate regulating valve is open and the expansion valve is closed in a first starting operation, and the flow rate regulating valve is closed and the electronic expansion valve is open to a predetermined extent in a second starting operation. The compressor is controlled by a duty control signal having a period shorter than a period during a normal operation for starting operations. rkov model, and wherein said second hidden Markov model contains fewer acoustic parameters than said first hidden Markov model. 20. The apparatus of claim 19 wherein each of said first speaker dependent speech model and said second speaker dependent speech model comprises a single state hidden Markov model. 21. The apparatus of claim 13 wherein said previously provided training speech comprises a plurality of repetitions of a phrase comprising one or more words, and wherein said speech utterance spoken by the speaker also comprises said phrase comprising said one or more words. 22. The apparatus of claim 13 wherein said speech utterance spoken by the speaker comprises a phrase comprising one or more words, and wherein said previously provided training speech does not include said phrase comprising said one or more words. 23. The apparatus of claim 13 wherein said means for verifying said proffered identity of the speaker comprises means for comparing said value reflecting a differential between said first score and said second score to a predetermined threshold. 24. The apparatus of claim 23 wherein said predetermined threshold equals one.