What is a LiquidSpring Smart Suspension and How does it work?

Process And Materials

LiquidSpring custom manufactures smart suspension systems and components using multiple processes. From advanced laser cutting to CNC machining and presses, all are finished off with a durable powder coat application. Assembled with custom-length hydraulic lines, the system is ready for installation at our main plant or through our network of partners.

About Us

See the LiquidSpring manufacturing facility in Lafayette, Indiana

LiquidSpring is a Smart Suspension System

LiquidSpring automatically and instantaneously changes the spring stiffness and damping at each individual wheel in response to road and driving conditions. When the road’s rough, the ride is soft and smooth. Should the vehicle need to make sharp turns, corners, or emergency evasive maneuvers, the suspension stiffens to provide superior stability and eliminates roll. Thanks to the on­board processor, the suspension adapts and makes adjustments without driver intervention for a fluid, seamless experience.


Built with CLASS®

The Compressible Liquid Adaptive Suspension System or CLASS® is a smart suspension system that utilizes liquid-based struts and an onboard processor to provide better handling and control when you need it, and a smoother, softer ride when you want it. In short, we named our company LiquidSpring because it is the heart of our system. A shock-absorbing liquid, enhanced with smart controls to bring you the right sized spring for every moment, instead of a one-size-fits-all metal spring solution.

Smart Suspension System = Computerized Controls

LiquidSpring uses an optimized 5-­link suspension configuration, struts with a compressible fluid as the spring/damping medium, and a sophisticated on‐board microprocessor to monitor driving conditions. This integrated system allows for automatic and instantaneous change of spring stiffness and damping at each individual wheel to simultaneously reduce ride harshness and increase roll and pitch control.




Low and High Stiffness Functionality

Operational Basics

LiquidSpring monitors and processes various vehicle signals and motion at each wheel via its ECU. From these inputs, the smart suspension system instructs each corner strut to change its stiffness and damping characteristics as required to minimize power transmitted from the suspension to the chassis while maintaining body control. The strut stiffness and damping characteristics are dependent upon its effective fluid volume.

LiquidSpring incorporates a rate valve between the strut and the secondary volume. The rate valve controls the interaction of fluid between the strut and secondary volume, thereby managing the effective fluid volume. As shown here, when the valve is completely open or closed the strut exhibits its lowest and highest stiffness, respectively. A proportionally closed valve causes the strut to exhibit transitional stiffness and damping.




LiquidSpring Smart Suspension System Components

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A 5-Link non-torque reactive design that maintains proper driveline angles throughout the range of travel which minimizes driveline noise, vibration, and fatigue. Jounce travel provided by the smart suspension system is compliant with Federal Specification KKK-A-1822 for rear floor height requirements when the “kneel” feature is used. Installation does not require modification to the O.E.M. exhaust system and its capacity rating matches the O.E.M. rating.



Strut Module

Fairly similar to a conventional hydraulic cylinder, however, the rod and non-rod chambers are equally pressurized and separated by viscous damping elements. Fluid pressure inside the strut is proportional to the external load applied to it.

The extension or retraction of the strut is determined by adding or subtracting fluid volume (at pressure proportional to the external load) equal to the amount of rod volume to be displaced. An integral rebound stop is built into the strut and it is pre-filled for installation.

2nd Fluid Volume

2nd Fluid Volume

A pressurized vessel mounted to the chassis frame and is connected to the strut via conventional hydraulic hose and fittings. This unit provides the spring rate change and the rate valve is critical in the performance of LiquidSpring’s smart suspension system.

Secondary volumes are pre-filled for installation.

CLASS Power Module with ECU

Power Module with ECU

The power module utilized by LiquidSpring integrates the pump, motor, manifolds, control valves, filters, low-pressure reservoir, and ECU and is mounted to the chassis frame. Industry standard hydraulic and electrical connections are used to interface it with the system.

Driver Interface

Driver Interface

This component provides the means to enable/disable the system, adjust ride modes, change suspension heights, and notify the driver of issues via a red warning LED. Troubleshooting system problems can be facilitated with the diagnostic codes illuminating various LED’s.

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