Process of operating the air conditioning system of a cab of a machine

1. A process for operating a machine having a cab having an access, comprising the steps of:

providing an air conditioning system including a circuit configured for supplying the cab with air coming from a recycling branch fed with air coming from an interior of the cab and an exterior branch fed with air coming from an exterior of the cab, a fan for providing an air flow inside the circuit, a filtration system for removing pollutants from the air blown in the cab through the circuit, the air conditioning system being operable to control an amount of air coming from the recycling branch versus an amount of air coming from the exterior branch in a supplied air flow;

operating the air conditioning system in a regular procedure for controlling the air supplied by each of the recycling and exterior branches;

monitoring a consecutive opening signal and a closing signal of the access;

only upon a detection of the closing signal, operating the air conditioning system in a flushing procedure, wherein the flushing procedure of the air conditioning system includes:

increasing the air flow supplied in the cab by the fan through the circuit;

controlling a flow of air to supply air coming only from the exterior branch by closing the recycling branch; and

opening an exhaust flap within the cab for increasing a flow of air evacuated from the cab the flushing procedure being performed for a determined period of time before performing the regular procedure again.

2. The process according to claim 1 , wherein the filtration system includes a first filter having a first level of filtration for removing pollutants.

3. The process according to claim 2 , wherein the filtration system further includes a second filter having a second level of filtration for removing pollutants.

4. The process according to claim 3 , wherein the air conditioning system further includes at least one filter selection valve, and the process further includes a step of switching from the first filter to the second filter, by the at least one filter selection valve, to filter air coming from the exterior branch at the second level of filtration for removing pollutants.

5. The process according to claim 1 , wherein the process further includes a step of checking a closing of the at least one access of the cab before performing the flushing procedure.

6. The process according to claim 1 , wherein the regular procedure provides for operating the air conditioning system so that the air flow from the exterior branch supplied in the cab presents a flow rate of at least 30 m 3 /h with an overpressure in the cab of at least 20 Pa.

7. The process according to claim 1 , wherein the flushing procedure provides for operating the fan to supply the cab with the air flow having a flow rate greater than 40 m 3 /h.

8. The process according to claim 1 , wherein the determined period of time for performing the flushing procedure is between 120 and 140 seconds.

9. A machine, comprising:

a cab having an interior and an exterior and an access; and

an air conditioning system including:

a circuit configured for supplying the cab with air coming from a recycling branch fed with air coming from the interior of the cab and an exterior branch fed with air coming from the exterior of the cab;

an exhaust flap within the cab;

a fan for providing an air flow inside the circuit;

a filtration system for removing pollutants from the air blown in the cab through the circuit, the air conditioning system being operable to control an amount of air coming from the recycling branch versus an amount of air coming from the exterior branch in a supplied air flow such that the air conditioning system is operable in a regular procedure and a flushing procedure for a determined period of time before operating in the regular procedure again; and

at least one pressure sensor configured for monitoring a consecutive opening and closing of the access of the cab and for providing an opening signal and a closing signal of the access such that the flushing procedure is performed only upon a detection of the closing signal,

wherein in the regular procedure the air conditioning system controls the air supplied by each of the recycling and exterior branches, and

wherein in the flushing procedure the air conditioning system increases the air flow supplied in the cab by the fan through the circuit, closes the recycling branch, thereby only allowing air coming from the exterior branch, and opens the exhaust flap for increasing a flow of air evacuated from the cab, the flushing procedure being performed before performing the regular procedure again.

10. The machine according to claim 9 , wherein the filtration system includes a first filter having a first level of filtration for removing pollutants.

11. The machine according to claim 10 , wherein the filtration system further includes a second filter having a second level of filtration for removing pollutants.

12. The machine according to claim 11 , wherein the air conditioning system further includes at least one filter selection valve configured for selectively switching between the first filter and the second filter.