Systems and methods for a suspension assembly on a vocational vehicle

A vocational vehicle comprising:

• a chassis including a first frame rail and a second frame rail;
• and
• a suspension assembly including:
• an upper control arm;
• a lower control arm;
• a damper coupled between the lower control arm and the first frame rail;
• a spring coupled between the lower control arm and the first frame rail;
• a roll control cylinder coupled between the lower control arm and the first frame rail, wherein the roll control cylinder includes:
• a body defining an internal cavity;
• a piston movably arranged within the internal cavity, wherein the piston divides the internal cavity into a piston chamber and a rod chamber;
• and
• a rod coupled to the piston and extending outwardly from the body;
• an accumulator in fluid communication with the piston chamber;
• and
• a charge supply in fluid communication with the accumulator, wherein the charge supply is configured to selectively change a charge pressure within the accumulator to adjust a roll rate or stiffness defined by the roll control cylinder.

A vocational vehicle comprising:

• a chassis including a first frame rail and a second frame rail;
• and
• a suspension assembly including:
• a first suspension subassembly including:
• a first roll control cylinder coupled to the first frame rail;
• and
• a first accumulator in fluid communication with the first roll control cylinder;
• a second suspension subassembly including:
• a second roll control cylinder coupled to the second frame rail;
• and
• a second accumulator in fluid communication with the second roll control cylinder, wherein the first roll control cylinder is cross plumbed with the second roll control cylinder;
• and
• a charge supply in fluid communication with both the first accumulator and the second accumulator, wherein the charge supply is configured to selectively change a charge pressure within both the first accumulator and the second accumulator to adjust a roll rate or stiffness defined by the first roll control cylinder and the second roll control cylinder.