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1. (WO2019027382) TRAILER MODE ESTIMATION METHOD FROM REAR SUSPENSION LOAD
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CLAIMS

1 A trailer mode estimation method (100) which allows for determining, from the load amount of the rear suspension of the tow truck (C), whether the trailer (D) is in detachment or unloading mode in heavy commercial vehicles with air suspension (S) in the rear axle used as tow trucks, said method comprising the process steps of:

measuring the load value of the air suspension (S) (110), and

- determining the decreasing tendency of the load value of the air suspension

(S) (120), and characterized by the process steps of:

lowering the height of the air suspension (S) (130),

re-measuring the load value of the air suspension (S) (140),

understanding that the trailer (D) unloading mode is present if the load value of the air suspension (S) is maintained, and performing no operation in this mode (150),

understanding that the trailer (D) detachment mode is present if the load value of the air suspension (S) tends to decrease (160), and

lowering the air suspension (S) down to the defined height value (170).

2. A trailer mode estimation method (100) as in Claim 1, characterized by determining whether there is any decrease based on the load value measured through the pressure sensor (B) by means of the control unit (ECU), in the process step of determining the decreasing tendency of the load value of the air suspension (S) (120).

3. A trailer mode estimation method (100) as in Claim 1, characterized by signaling, in order to detect the reason for the decreasing tendency in the load value, the control valve (V) connected to the air bellows (H) by the control unit (ECU) so that the air bellows (H) will be deflated, in the process step of decreasing the air suspension (S) height (130).

4. A trailer mode estimation method (100) as in Claim 1, characterized by re-measuring the air suspension (S) load by the control unit (ECU) and re-measuring the load value of the air suspension (S) through the pressure sensor (B), in the process step of measuring the load value of the air suspension (S) (140).

5. A trailer mode estimation method (100) as in Claim 1, characterized by detecting the decrease in the load value of the air suspension (S) due to the unloading mode of the trailer (D) by the control unit (ECU) and performing no operation, in the process step of understanding that the trailer (D) unloading mode is present if the load value of the air suspension (S) is maintained and performing no operation (150).

6. A trailer mode estimation method (100) as in Claim 1, characterized by re-measuring the air suspension (S) load through the pressure sensor (B) when the air suspension (S) height is lowered by the control unit (ECU), and detecting, via the control unit (ECU) again, that the trailer is in detachment mode if a decrease in the load value is measured upon lowering the height, in the process step of understanding that the trailer (D) detachment mode is present if the load value of the air suspension (S) tends to decrease (160).

7. A trailer mode estimation method (100) as in Claim 1, characterized by signaling the control valve (V) to deflate the air bellows (H) by the control unit (ECU) in order to decrease the air suspension (S) height and lowering the air suspension (S) down to the height value defined in the memory thereof, in the process step of lowering the air suspension (S) down to the defined height value (170).

8. A trailer mode estimation method (100) as in Claim 7, characterized by measuring the load status of the air suspension (S) and lowering the level of the air suspension (S) when the load status approximates to the empty load of the tow truck (C), and lowering it down to the height value defined for the tow truck (C) by means of the control unit (ECU), in the process step of lowering the air suspension (S) down to the defined height value (170).

9. A trailer mode estimation method (100) as in Claim 7, characterized by waiting until the tow truck (C) operates and starts to accelerate and lowering the level of the air suspension (S) when the tow truck (C) starts to accelerate, and lowering it down to the height value defined for the tow truck (C) by means of the control unit (ECU), in the process step of lowering the air suspension (S) down to the defined height value (170).