METHOD FOR OPERATING A COOLANT CIRCUIT FOR A VEHICLE AIR-CONDITIONING SYSTEM
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Abstract
A method for operating a cooling circuit. It is provided that a) the actuation signal ST of the coolant compressor is provided so as to increase over time from a minimum value (STmin) in order to generate a start-up phase of the coolant compressor, b) a control signal maximum value (STmax) and a control signal threshold (STSW) are provided, where STSW<STmax, c) the actuation signal (ST) is limited to the control signal maximum value (STmax) if the actuation signal (ST) reaches the control signal threshold (STSW) and the measured high and/or low-pressure value (PHD, PND) satisfies a condition.
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15 Claims
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1-8. -8. (canceled)
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9. A method for operating a cooling circuit for a vehicle air-conditioning system with
a coolant compressor which can be controlled by means of an actuation signal (ST) for controlling the compressor capacity, a condenser or gas cooler, an evaporator (3) with associated expansion device, and at least one pressure sensor means (pT1, pT3) for measuring the coolant pressure on the high-pressure and/or low-pressure side of the cooling circuit, comprising: -
a) the actuation signal ST of the coolant compressor is provided so as to increase over time from a minimum value (STmin) in order to generate a start-up phase of the coolant compressor, b) a control signal maximum value (STmax) and a control signal threshold (STSW) are provided, where STSW<
STmax,c) the actuation signal (ST) is limited to the control signal maximum value (STmax) if the actuation signal (ST) reaches the control signal threshold (STSW) and the measured high- and/or low-pressure pressure value (PHD, PND) satisfies or satisfy one of the following conditions; (I) the high-pressure value (PHD) is less than a high-pressure threshold (SP_HD), (II) the low-pressure value (PND) is greater than a low-pressure threshold (SP_ND), and/or (III) the difference (Δ
P) between high-pressure value (PHD) and low-pressure value (PND) is less than a differential pressure threshold (SΔ
P), andd) after the expiration of a defined duration (t), the start-up phase of the coolant compressor is terminated if the measured high-pressure value (PHD) and/or the measured low-pressure value (PND) still satisfy or satisfies one of the conditions (I) to (III). - View Dependent Claims (10, 11, 12, 13, 14, 15)
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Specification