Abstract: In order to improve the reliability of a system, sub-system or component, a method for controlling the operation of a system, sub-system or component, comprises the steps of a) repeatedly recording an operation time of said system, sub-system or component and at least one further parameter relevant to system, sub-system or component aging b) evaluating a usage profile based on said recorded operation time and said at least one further parameter, said usage profile being indicative of the accumulated stress at the time of the evaluation, and c) if a difference between said evaluated usage profile and a nominal usage value at the time of the evaluation exceeds a predetermined threshold value, adjusting an operation parameter of said system, sub-system or component.

Abstract: In order to improve the reliability of a system, sub-system or component, a method for controlling the operation of a system, sub-system or component, comprises the steps of

Abstract: An air conditioning system (10) for the passenger compartment of a motor vehicle comprising a main tube (22) for fluidly connecting a compressor (12) to an outside heat exchanger (14), the outside heat exchanger to an expansion device (16), the expansion device to an inside heat exchanger (18), the inside heat exchanger to an accumulator (20), and the accumulator to the compressor; a bypass tube (28) fluidly connected to the main tube between the compressor and the outside heat exchanger and between the expansion device and the inside heat exchanger; and a valve (30) positioned in the bypass tube; wherein the valve has a closed position when refrigerant fluid flows through the main tube in a first direction (X) from the compressor through the outside heat exchanger, the expansion device, the inside heat exchanger and the accumulator back to the compressor, for cooling of the passenger compartment, and an open position when refrigerant fluid flows in the first direction and through the bypass tube and the valv