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1. (WO2018158743) METHOD OF CONTRASTING THE JUMPING TRIGGERED BY A RESONANCE OSCILLATION IN A MOTOR VEHICLE WITH THREE OR FOUR WHEELS
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Claims

1 . Method of contrasting the jumping triggered by a resonance oscillation in a motor vehicle with three or four wheels, said motor vehicle comprising: - a forecarriage frame (16); - at least a pair of front wheels (10', 10") kinematically connected to each other and to the forecarriage frame (16) by means of a rolling kinematic mechanism (20); - a roll block system (100) suitable to block the rolling of the two front wheels (10', 10"), wherein said roll block system (100) acts directly or indirectly on said rolling kinematic mechanism (20),

said method being characterized in that it comprises the operating steps of:

-a) detecting a resonance oscillation which is triggered while driving the motor vehicle and generates an alternate jumping of the rolling kinematic mechanism (20), wherein said step a) of detecting generates selectively: an active resonance signal related to the presence of resonance oscillations of rolling kinematic mechanism (20); and a passive resonance signal related to the non-presence of resonance oscillations of rolling kinematic mechanism (20);

-b) actuating said roll block system (100) in presence of said active resonance signal;

- b') keeping said roll block system (100) neutral in presence of said passive resonance signal,

wherein said step of actuating said roll block system (100) is suitable to damp the resonance oscillations resulting in a progressive damping of the alternate jumping of the rolling kinematic mechanism (20) and thus of the front wheels (10', 10"), until annulling said oscillations.

2. Method according to claim 1 , wherein said actuating step b) is a step of actuating intermittently said roll block system (100).

3. Method according to one or more of the previous claims, wherein said actuating step b) is prolonged for the entire period of time during which said active resonance signal detected in said detection step a) persists, so that said detection step a) and said actuating step b) are repeated in a loop as long as said active resonance signal persists in order to achieve a complete damping of the resonance oscillation of said rolling kinematic mechanism (20).

4. Method according to one or more of the preceding claims, wherein said detection

step a) is achieved by means of at least one sensor (81 , 82) placed on said front wheels (10', 10") and/or on said rolling kinematic mechanism (20).

5. Motor vehicle according to one or more of the preceding claims, wherein said detection step a) comprises a step c) of monitoring the oscillations of the front wheels (10', 10") and/or of the rolling kinematic mechanism (20).

6. Method according to claim 5, wherein the monitoring step c) comprises at least one of the following sub-steps:

-c1 ) measuring the oscillations on the front wheels (10', 10") by means of sensors (81 ) associated to the front wheels (10', 10"), and

-c2) measuring the oscillations on the rolling kinematic mechanism (20) by means of sensors (82) associated with the rolling kinematic mechanism (20)

wherein said sensors (81 , 82) are suitable to generate corresponding response signals (81 a, 82a)

and wherein said monitoring step c) comprises a sub-step d) of processing said response signals (81 a, 82a) generated by said sensors (81 , 82) applying a predefined filtering logic to distinguish between said active resonance signal related to the presence of resonance oscillations of the rolling kinematic mechanism (20) and a passive resonance signal related to the absence of resonance oscillations of the rolling kinematic mechanism (20).

7. Method according to claim 6, wherein said sensors (81 ,82) associated to the front wheels (10', 10") and/or to the rolling kinematic mechanism (20) comprise at least one sensor chosen from: an accelerometer; an angular potentiometer placed between the rolling kinematic mechanism (20) and frame (16) to check the roll and associated with linear and/or angular displacement sensors; and a combination thereof.

8. Method according to claim 7, wherein said sensors (81 ) associated to the front wheels (10', 10") comprise at least one accelerometer for each front wheel (10', 10").

9. Method according to one or more of the claims from 6 to 8, where the sub-steps c1 ) and c2) of measuring the oscillations are conducted with a time frequency of signal acquisition at least greater than 20 Hz, and preferably from 50 and 100 Hz, and even more

preferably greater than 100 Hz.

10. Method according to one or more of the claims from 6 to 9, wherein said monitoring step c) comprises a step c3) of measuring the oscillations on the suspensions by means of sensors (83) associated to the suspensions (90) which is actuated in combination with at least one of the sub-steps c1 )-c2).

1 1 . Method according to claim 10, wherein said sensors (83) associated to said suspensions comprise a position sensor.

12. Method according to claim 10 or 1 1 , wherein said processing sub-step d) is conducted by acquiring the signals generated in at least one of the sub-steps c1 )-c2) and the signals generated by the detection sensors (83) of the oscillations of the suspensions in the sub-step c3), said predefined filtering logic classifying as unrelated to resonance oscillations of the rolling kinematic mechanism those vibratory phenomena coupled to suspension compression (90).

13. Method according to one or more of the preceding claims wherein said roll block system (100) of the two front wheels (10', 10") operating in blocking directly or indirectly said rolling kinematic mechanism (20) comprises devices suitable to exert a continuous and not discreet blocking and/or damping action of the rolling kinematic mechanism (20).

14. Method according to one or more of the preceding claims, wherein said step b) of intermittently actuating said roll block system (100) is carried out according to a predefined scheme of intervention based on a modulation of the blocking frequency.

15. Method according to claim 14, where said predefined intervention scheme is based on a modulation of the frequency and intensity of blocking.

16. Method according to claim 14 or 15, wherein the actuation of said roll block system (100) in step b) is modulated in frequency, and possibly also in intensity, so as not to lead to a complete blockage of the roll while driving the motor vehicle, the intermittent actuation of the blocking system (100) having as effect only a slowing down of the roll movements in order to maintain substantially unchanged the driving dynamics of said vehicle.

17. Method according to one or more of the preceding claims, characterised in that said detection a) and actuation steps b) are implemented and executed to operate automatically

via program means loaded on an electronic control unit (80) of the motor vehicle.

18. Method according to one or more of the preceding claims, wherein said rolling kinematic mechanism (20) consists of an articulated quadrilateral system.

19. Method according to one or more of the preceding claims, wherein said roll block system (100) of the front wheels (10', 10") acts directly on said rolling kinematic mechanism

(20).

20. Method according to claim 18 and 19, wherein said roll block system (100) comprises releasable blocking means of the configuration of said articulated quadrilateral system.

21 . Method according to one or more of the claims from 1 to 18, wherein said roll block system (100) of the front wheels (10', 10") acts indirectly on said rolling kinematic mechanism (20).

22. Method according to claim 21 , wherein each front wheel (10', 10") is connected to said rolling kinematic mechanism (20) by a respective axle journal (50), the latter being mechanically connected to a rotation pin (51 ) of the wheel in order to support it rotatably about an axis of rotation (R-R), said motor vehicle comprising suspension means (90) which guarantee each axle journal (50) at least one springing motion with respect to said rolling kinematic mechanism (20), said roll block system (100) comprising a second kinematic mechanism (1 10) which directly connects the two front wheels (10', 10") at the respective axle journals (50) by means of hinging means and is suitable to adopt at least two different configurations: - a free configuration, wherein said second kinematic mechanism (1 10) follows passively and transparently with respect to the driving dynamics the movements of said two wheels (10', 10") with each other and with respect to the frame (16); and - a blocked configuration, wherein said second kinematic mechanism (1 10) blocks the angle formed by a lying plane of at least one wheel with respect to the ground.

23. System for contrasting the jumping triggered by a resonance oscillation in a motor vehicle with three or four wheels, said motor vehicle comprising: - a forecarriage frame (16); - at least a pair of front wheels (10', 10") kinematically connected to each other and to the forecarriage frame (16) by means of a rolling kinematic mechanism (20); - a roll block system (100) suitable to block the rolling of the two front wheels (10', 10"), wherein said roll block system (100) acts directly or indirectly on said rolling kinematic mechanism (20), said system comprising programme means configured to:

- a) detecting a resonance oscillation which is triggered while driving the motor vehicle and generates an alternate jumping of the rolling kinematic mechanism (20), wherein said step a) of detecting generates selectively: an active resonance signal related to the presence of resonance oscillations of rolling kinematic mechanism (20), and a passive resonance signal related to the non-presence of resonance oscillations of rolling kinematic mechanism (20);

- b) actuating said roll block system (100) in presence of said active resonance signal;

- b') keeping said roll block system (100) neutral in presence of said passive resonance signal,

wherein said step b) of actuating said roll block system (100) is suitable to damp the resonance oscillations resulting in a progressive damping of the alternate jumping of the rolling kinematic mechanism (20) and thus of the front wheels (10', 10"), until annulling said oscillations.