Method to control the active shock absorbers of a road vehicle featuring the adjustment of the roll angle and of the pitch angle

A method to control active shock absorbers (6) of a road vehicle (1);

• each active shock absorber (6) is part of a suspension (5) connecting a frame (4) to a hub (3) of a wheel (2) and is provided with an actuator (10);
• the control method comprises the steps of:
• determining a longitudinal acceleration (ax) and a transverse acceleration (ay) of the road vehicle (1);
• establishing a desired roll angle (φTGT) based on the transverse acceleration (ay);
• establishing a desired pitch angle (θTGT) based on the longitudinal acceleration (ax);
• and
• controlling the actuator (10) of each active shock absorber (6) so as to obtain the desired roll angle (φTGT) and the desired pitch angle (θTGT);
• wherein the desired roll angle (φTGT) is established depending on the sole transverse acceleration (ay) by means of a first linear law (L3);
• wherein the desired pitch angle (θTGT) is established depending on the sole longitudinal acceleration (ax) by means of a second linear law (L4);
• wherein the second linear law (L4) entails increasing the desired pitch angle (θTGT) by a value ranging from 1.2° to 2.0° with each 1 g increase of the absolute value of the longitudinal acceleration (ax).

A method to control active shock absorbers (6) of a road vehicle (1);

• each active shock absorber (6) is part of a suspension (5) connecting a frame (4) to a hub (3) of a wheel (2) and is provided with an actuator (10);
• the control method comprises the steps of:
• determining a longitudinal acceleration (ax) and a transverse acceleration (ay) of the road vehicle (1);
• establishing a desired roll angle (φTGT) based on the transverse acceleration (ay);
• establishing a desired pitch angle (θTGT) based on the longitudinal acceleration (ax);
• and
• controlling the actuator (10) of each active shock absorber (6) so as to obtain the desired roll angle (φTGT) and the desired pitch angle (θTGT);
• wherein the desired roll angle (φTGT) is established depending on the sole transverse acceleration (ay) by means of a first linear law (L3);
• wherein the desired pitch angle (θTGT) is established depending on the sole longitudinal acceleration (ax) by means of a second linear law (L4);
• wherein the second linear law (L4) entails a positive pitch angle (θTGT) greater than zero when the value of the longitudinal acceleration (ax) is zero and it entails a negative pitch angle (θTGT) when the value of the longitudinal acceleration (ax) is positive and greater than 0.3 g.