Articulated self-propelled work machine

1. An articulated self-propelled work machine ( 1 ) comprising:

a front frame ( 11 ), provided with a pair of front wheels ( 111 );

a lift arm ( 2 ), adapted to support a load, hinged to said front frame ( 11 ) and mobile with respect thereto by means of at least one actuator ( 21 , 22 );

a rear frame ( 12 ), provided with a pair of rear wheels ( 121 ) and articulated to said front frame ( 11 );

at least one detecting means ( 51 , 53 , 54 ) for detecting an angular parameter relative to a steering angle between the front frame ( 11 ) and the rear frame ( 12 ); and

electronic processing means ( 6 ) configured to control the operation of said at least one actuator ( 21 , 22 ) on the basis of said angular parameter;

wherein the processing means ( 6 ) is configured to control the operation of the actuator or actuators ( 21 , 22 ) of the arm ( 2 ) in accordance with a load diagram selected as a function of the angular parameter detected.

2. The machine ( 1 ) according to claim 1 , comprising detecting means ( 52 ) for detecting a load parameter which is a function of torque to which the arm ( 2 ) is subjected, said processing means ( 6 ) being configured to control the operation of said actuator ( 21 , 22 ) on the basis of said load parameter.

3. The machine ( 1 ) according to claim 2 , wherein the processing means ( 6 ) comprises an electronic processing unit ( 6 ) which comprises a limitation module ( 62 ) configured to regulate the operation of the actuator or actuators ( 21 , 22 ) so as to limit the movement velocity of the arm ( 2 ); said limitation module ( 62 ) being activatable and deactivatable on the basis of said load parameter.

4. The machine according to claim 2 , wherein the processing unit ( 6 ) is configured to calculate said torque on the basis of the signal produced by a stress sensor ( 52 , 53 , 54 ), and wherein said detecting means of the load parameter comprises the stress sensor ( 52 ).

5. The machine ( 1 ) according to claim 1 , wherein said at least one actuator ( 21 , 22 ) comprises one or more first actuators ( 21 ); and wherein said arm ( 2 ) can be raised and lowered with respect to the front frame ( 11 ), by means of said one or more first actuators ( 21 ), the operation of which is subjected to the processing means ( 6 ).

6. The machine ( 1 ) according to claim 5 , wherein the processing means ( 6 ) comprises an electronic processing unit ( 6 ) which comprises a limitation module ( 62 ) configured to regulate the operation of the actuator or actuators ( 21 , 22 ) so as to limit the movement velocity of the arm ( 2 ); said limitation module ( 62 ) being activatable and deactivatable on the basis of a load parameter, and wherein the limitation module ( 62 ) is configured to prevent the arm ( 2 ) from lowering and/or extending with a velocity of greater than a limit value.

7. The machine ( 1 ) according to claim 5 , wherein the processing means ( 6 ) comprises an electronic processing unit ( 6 ) which comprises a limitation module ( 62 ) configured to regulate the operation of the actuator or actuators ( 21 , 22 ) so as to limit the movement velocity of the arm ( 2 ); said limitation module ( 62 ) being activatable and deactivatable on the basis of a load parameter, and wherein the limitation module ( 62 ) is configured to determine a slowing of the arm ( 2 ) during a descent and/or during an extension thereof.

8. The machine ( 1 ) according to claim 5 , wherein the processing means ( 6 ) comprises an electronic processing unit ( 6 ) provided with a velocity module configured to determine at which velocities the arm ( 2 ) can move, as a function of the angular parameter, and wherein the velocity module is configured to regulate the operation of the first actuator(s) so as to limit the descent velocity and/or the extending velocity of the arm ( 2 ), when the angular parameter exceeds a threshold value.

9. The machine ( 1 ) according to claim 5 , wherein the processing means ( 6 ) comprises an electronic processing unit ( 6 ) which includes a velocity module configured to determine a movement velocity of the arm ( 2 ), as a function of the load parameter, and wherein the velocity module is configured to regulate the operation of the first actuator(s) so as to limit the descent velocity and/or the extension velocity of the arm ( 2 ), when the load parameter exceeds a threshold value.

10. The machine ( 1 ) according to claim 1 , wherein said at least one actuator ( 21 , 22 ) comprises at least a second actuator ( 22 ); and wherein said arm ( 2 ) is extensible and retractable by means of said at least a second actuator ( 22 ), the operation of which is subjected to the processing means ( 6 ).

11. The machine ( 1 ) according to claim 1 , wherein the processing means ( 6 ) comprises an electronic processing unit ( 6 ) provided with a limitation module ( 62 ) configured to regulate the operation of the actuator or actuators ( 21 , 22 ), so as to limit a movement velocity of the arm ( 2 ); said limitation module ( 62 ) being activatable and deactivatable on the basis of said angular parameter.

12. The machine ( 1 ) according to claim 11 , wherein the processing means ( 6 ) comprises said electronic processing unit ( 6 ) which comprises said limitation module ( 62 ) configured to regulate the operation of the actuator or actuators ( 21 , 22 ) so as to limit the movement velocity of the arm ( 2 ); said limitation module ( 62 ) being activatable and deactivatable on the basis of a load parameter, and wherein the limitation module ( 62 ) is configured to prevent the arm ( 2 ) from lowering and/or extending with a velocity of greater than a limit value, and wherein the processing unit ( 6 ) includes an activation module ( 63 ) configured to activate the limitation module when the steering angle exceeds a threshold value.

13. The machine ( 1 ) according to claim 11 , wherein the processing means ( 6 ) comprises said electronic processing unit ( 6 ) which comprises said limitation module ( 62 ) configured to regulate the operation of the actuator or actuators ( 21 , 22 ) so as to limit the movement velocity of the arm ( 2 ); said limitation module ( 62 ) being activatable and deactivatable on the basis of a load parameter, and wherein the limitation module ( 62 ) is configured to prevent the arm ( 2 ) from lowering and/or extending with a velocity of greater than a limit value, and wherein the processing unit ( 6 ) includes an activation module ( 63 ) configured to activate the limitation module when a weight of said load exceeds a threshold value.

14. The machine ( 1 ) according to claim 1 , wherein the processing means ( 6 ) comprises an electronic processing unit ( 6 ) provided with a velocity module configured to determine at which velocities the arm ( 2 ) can move, as a function of the angular parameter.

15. The machine ( 1 ) according to claim 1 , wherein the processing means ( 6 ) comprises an electronic processing unit ( 6 ) which includes a velocity module configured to determine a movement velocity of the arm ( 2 ), as a function of the load parameter.

16. The machine according to claim 1 , wherein the processing unit ( 6 ) comprises a selection module configured to select said load diagram as a function of the value of the angular parameter.

17. The machine according to claim 16 , wherein said selection module is configured to change the load diagram when the angular parameter exceeds a threshold value.

18. The machine ( 1 ) according to claim 1 , wherein the front frame ( 11 ) is rotatable with respect to the rear frame ( 12 ) by means of at least a pair of steering actuators ( 41 , 42 ), each of which is hinged at opposite ends to the front frame ( 11 ) and to the rear frame ( 12 ), respectively, at least one of said steering actuators ( 41 , 42 ) being connected to at least a positioning sensor adapted to measure the extension and retraction of the respective steering actuator ( 41 , 42 ) and adapted to produce a signal.

19. The machine ( 1 ) according to claim 1 , wherein the front frame ( 11 ) and the rear frame are articulated by means of a hinge at which at least an angular measuring sensor ( 51 ) is arranged, adapted to produce a signal.

20. The machine ( 1 ) according to claim 1 , wherein said at least one detecting means ( 51 , 53 , 54 ) for detecting an angular parameter comprises at least a stress sensor ( 52 , 53 , 54 ) located at the front frame ( 11 ) and adapted to measure a dimensional deformation thereof and to produce a signal.

21. The machine ( 1 ) according to claim 20 , wherein at least two stress sensors ( 53 , 54 ) are located at distanced points on the front frame ( 11 ).

22. The machine ( 1 ) according to claim 21 , wherein an inclination module is adapted to carry out a comparison between the signals produced by said at least two stress sensors and thus determine the angular parameter.

23. The machine according to claim 20 , wherein the processing unit ( 6 ) is configured to calculate a torque on the basis of the signal produced by said at least a stress sensor ( 52 , 53 , 54 ).

24. An operating method of a self-propelled work machine ( 1 ) of an articulated type, comprising the following steps:

acquiring an angular parameter relative to a steering angle defined between a front frame ( 11 ) of the machine ( 1 ), provided with front wheels ( 111 ) and to which a lift arm ( 2 ) is hinged, adapted to bear a load, and a rear frame ( 12 ) of the machine ( 1 ), hinged to the front frame ( 11 ) and provided with rear wheels ( 121 ); and

controlling movements of said arm ( 2 ) as a function of said angular parameter; wherein the movements of the arm ( 2 ) are controlled by means of a load diagram selected as a function of the angular parameter acquired.

25. The method according to claim 24 , wherein the descent velocity and/or the extension velocity of the arm ( 2 ) is regulated as a function of the angular parameter.

26. The method according to claim 24 , comprising the step of acquiring a load parameter relative to the weight of the load borne by the arm ( 2 ), wherein the movements of the arm ( 2 ) are controlled as a function of said load parameter.

27. An electronic processing means ( 6 ) which is provided with a software program which, when running on said electronic processing means ( 6 ), is configured to actuate the method according to claim 24 .

28. An articulated self-propelled work machine ( 1 ) comprising:

a front frame ( 11 ), provided with a pair of front wheels ( 111 );

a lift arm ( 2 ), adapted to support a load, hinged to said front frame ( 11 ) and mobile with respect thereto by means of at least one actuator ( 21 , 22 );

a rear frame ( 12 ), provided with a pair of rear wheels ( 121 ) and articulated to said front frame ( 11 );

at least one detecting means ( 51 , 53 , 54 ) for detecting an angular parameter relative to a steering angle between the front frame ( 11 ) and the rear frame ( 12 ); and

electronic processing means ( 6 ) configured to control the operation of said at least one actuator ( 21 , 22 ) on the basis of said angular parameter;

wherein the processing means ( 6 ) comprises an electronic processing unit ( 6 ) provided with a limitation module ( 62 ) configured to regulate the operation of the actuator or actuators ( 21 , 22 ), so as to adjust the descent velocity of the arm ( 2 ), so as to make it lower at a velocity slower than the maximum potential velocity on the basis of said angular parameter.

29. An articulated self-propelled work machine ( 1 ) comprising:

a front frame ( 11 ), provided with a pair of front wheels ( 111 );

a lift arm ( 2 ), adapted to support a load, hinged to said front frame ( 11 ) and mobile with respect thereto by means of at least one actuator ( 21 , 22 );

a rear frame ( 12 ), provided with a pair of rear wheels ( 121 ) and articulated to said front frame ( 11 );

at least one detecting means ( 51 , 53 , 54 ) for detecting an angular parameter relative to a steering angle between the front frame ( 11 ) and the rear frame ( 12 ); and

electronic processing means ( 6 ) configured to control the operation of said at least one actuator ( 21 , 22 ) on the basis of said angular parameter;

wherein said arm ( 2 ) can be raised and lowered with respect to the front frame ( 11 ), by means of one or more first actuators ( 21 ), the operation of which is subjected to the processing means ( 6 );

wherein the processing means ( 6 ) comprises an electronic processing unit ( 6 ) provided with a limitation module ( 62 ) configured to regulate the operation of the actuator or actuators ( 21 , 22 ), so as to limit a movement velocity of the arm ( 2 ), so as to make it lower at a velocity slower than the maximum potential velocity on the basis of said angular parameter;

wherein the processing means ( 6 ) comprises said electronic processing unit ( 6 ) which comprises said limitation module ( 62 ) configured to regulate the operation of the actuator or actuators ( 21 , 22 ) so as to limit the movement velocity of the arm ( 2 ); said limitation module ( 62 ) being activatable and deactivatable on the basis of said load parameter, and wherein the limitation module ( 62 ) is configured to determine a slowing of the arm ( 2 ) during a descent and/or during an extension thereof.

30. An articulated self-propelled work machine ( 1 ) comprising:

a front frame ( 11 ), provided with a pair of front wheels ( 111 );

a lift arm ( 2 ), adapted to support a load, hinged to said front frame ( 11 ) and mobile with respect thereto by means of at least one actuator ( 21 , 22 );

a rear frame ( 12 ), provided with a pair of rear wheels ( 121 ) and articulated to said front frame ( 11 );

at least one detecting means ( 51 , 53 , 54 ) for detecting an angular parameter relative to a steering angle between the front frame ( 11 ) and the rear frame ( 12 ); and

electronic processing means ( 6 ) configured to control the operation of said at least one actuator ( 21 , 22 ) on the basis of said angular parameter;

wherein at least a stress sensor ( 52 , 53 , 54 ) is located at the front frame ( 11 ) and is adapted to measure a dimensional deformation thereof and to produce a signal; wherein the at least one detecting means ( 51 , 53 , 54 ) for detecting an angular parameter comprises at least two stress sensors ( 53 , 54 ) located at distanced points on the front frame ( 11 ); and wherein an inclination module is adapted to carry out a comparison between the signals produced by said at least two stress sensors and thus determine the angular parameter.