Method for controlling a first reference temperature in a device for compressing gas

A method for controlling a first reference temperature in a device (1) for compressing gas to a first desired temperature value,

• wherein the device (1) comprises:
• an oil-injected element (2) for suctioning the gas at an inlet (3) of the device (1) and compressing this gas to an operating pressure at an outlet (4) of the oil-injected element (2);
• an oil injection pipe network (6) with a discharge (7) for injecting oil into the oil-injected element (2), comprising:
• an apportioning means (8) for apportioning the oil into a first part and into a second part;
• an oil cooler (10) cooled by a fan (9), for cooling the first part;
• and
• a bypass (11) for diverting the second part past the oil cooler (10),
• wherein the method comprises:
• determining a required apportioning proportion of the first part for directing a second reference temperature in the device (1) to a second desired temperature value;
• controlling an apportioning proportion of the first part to the required apportioning proportion;
• determining a required speed of the fan (9) for directing the first reference temperature to the first desired temperature value, wherein, if the first reference temperature is the same as the second reference temperature, determining the required speed on the basis of the second desired temperature value and the apportioning proportion;
• and
• controlling a speed of the fan (9) to the required speed,
• wherein the apportioning proportion is controlled using a control unit (15) on the basis of a non-fuzzy logic algorithm with the following as input:
• a first current value al for the second reference temperature;
• and
• the second desired temperature value.