Method and system for controlling a compressor
First Claim
1. A method for controlling a compressor in a refrigerant circuit of an air-conditioning system in a motor vehicle driven by an engine, comprising:
- determining an instantaneous load torque (M) of the compressor as a function (f) of at least one variable;
determining a predetermined maximum limiting torque (Mlimit) as a function (f) of at least one variable and based on parameters set by a controller of the engine;
comparing M with Mlimit, and if M>
Mlimit;
using an inverted function (finv) which is derived from function (f) to generate a control signal for the compressor based on Mlimit; and
controlling the compressor based at least in part on the generated control signal.
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Abstract
The invention relates to a method and system for controlling a compressor in a refrigerant circuit of an air-conditioning system of a motor vehicle. The instantaneous load torque is determined and compared with a maximum limiting torque prescribed by an engine controller, and the compressor is controlled depending on the comparison value resulting therefrom. In order to avoid complete shutdown of the compressor, the instantaneous load torque is represented as a function of variables, such as compressor speed and high pressure of the refrigerant, and, using an inverted function belonging to this function, a control signal for the compressor, for example, a set-point value for the high pressure of the refrigerant, is determined as a function of the maximum limiting torque and employed to control the compressor.
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Citations
23 Claims
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1. A method for controlling a compressor in a refrigerant circuit of an air-conditioning system in a motor vehicle driven by an engine, comprising:
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determining an instantaneous load torque (M) of the compressor as a function (f) of at least one variable;
determining a predetermined maximum limiting torque (Mlimit) as a function (f) of at least one variable and based on parameters set by a controller of the engine;
comparing M with Mlimit, and if M>
Mlimit;
using an inverted function (finv) which is derived from function (f) to generate a control signal for the compressor based on Mlimit; and
controlling the compressor based at least in part on the generated control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A control system for controlling a compressor in a refrigerant circuit of an air-conditioning system in a motor vehicle driven by an engine, comprising:
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a circuit for determining an instantaneous load torque (M) of the compressor as a function (f) of at least one variable, wherein function (f) is stored in a look-up table;
a circuit for determining a predetermined maximum limiting torque (Mlimit) as a function (f) of at least one variable and based on parameters set by a controller of the engine;
a comparator for comparing M with Mlimit;
a circuit for generating, when M>
Mlimit and using an inverted function (finv) which is derived from function (f), a control signal for the compressor based on Mlimit; and
a control circuit for controlling the compressor based at least in part on the generated control signal. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23)
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Specification