Vehicle stabilization and how Rivian’s system works
“Body roll” is the tilting or leaning motion of the vehicle’s body and the transfer of weight to the outside wheels that occurs when a vehicle turns a corner. Many vehicles have anti-roll bars—commonly known as “sway bars” or “stabilizer bars”—which connect the right and left wheels to reduce body roll during cornering. However, because of the way they’re designed, anti-roll bars can also lead to a harsher ride. Rivian vehicles don’t have anti-roll bars; instead, we've built a sophisticated hydraulic roll control system in-house.
The system uses hydraulically interconnected circuits at each corner to control body roll. It also has a pump that can increase or decrease hydraulic pressure to allow more or less body roll depending on your drive mode or ride feel selection.
Each damper also has what we call a "comfort valve." When these valves are open, they disconnect the hydraulic circuits that create roll stiffness. This allows the wheels to move more independently, soaking up bumps and uneven surfaces without transferring that motion to the rest of the vehicle. This results in a smoother, more comfortable ride for all.
Getting the comfort valves to work is a complex process. We need them open for comfort, but we also need them to close instantly when you start turning to keep your Rivian stable and responsive. That means our system has to constantly monitor things like your speed, steering wheel movement, how quickly you're turning and lateral grip.
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