CONTROL DEVICE FOR VARIABLE DISPLACEMENT COMPRESSOR, AND CONTROL METHOD FOR THE VARIABLE DISPLACEMENT COMPRESSOR

WIPO Patent Application WO/2008/018549

A1

Provided is a control method for a variable displacement compressor (8) to control a compression displacement by using a displacement control valve (13) for sensing a differential pressure between a high-side pressure (Pd) and a low-side pressure (Ps) in a cooling cycle (7a). The control method comprises calculating a target duty value (Dt1) of the displacement control valve (13) from a target evaporator blow-out temperature (TMeva) and a real evaporator blow-out temperature (Teva), calculating a drive torque (Trq2) of the compressor (8) at the instant when it is assumed from the high-side pressure (Pd) that the variable displacement compressor (8) is in a full stroke state, as the upper-limit drive torque (Trq2), calculating an estimated drive torque (Trq1) of the compressor (8) from a real control current value (Isolc), setting the target duty value (Dt1) as an output duty value (Dtc) in case the estimated drive torque (Trq1) is less than the upper-limit drive torque value (Trq2), and sets a duty value (Dt2) calculated from the upper-limit drive torque (Trq2), as the output duty value (Dtc) in case the estimated drive torque (Trq1) is the upper-limit drive torque value (Trq2) or more.

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TAKAHASHI EIJI

PCT/JP2007/065628

February 14, 2008

August 09, 2007

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CALSONIC KANSEI CORP (JP)
TAKAHASHI EIJI

F04B27/14; B60H1/32; F04B49/06

JP2004211663A	2004-07-29
JP2005188290A	2005-07-14
JP2006077621A	2006-03-23
JP2004175290A	2004-06-24

MIYOSHI, Hidekazu et al. (2-8 Toranomon 1-chome,Minato-k, Tokyo 01, JP)

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