Magnetorheological Fluid (MRF)

Magnetorheological fluid is a type of “smart” fluid that GM is currently using in its Magnetic Selective Ride Control active suspension control system, available on several Cadillac models, a performance version of the Buick Lucerne and the Chevrolet Corvette.

The system isolates and smoothes the action of each tire, resulting in less bouncing, vibration and noise. On bumpy or slick surfaces, the system integrates with traction control to assure maximum stability. It also works with ABS to keep the vehicle balanced and poised. It is the only system without electro-mechanical valves and no small moving parts.

GM also is developing a MRF-based speed-modulating radiator fan that provides faster response, better cooling, improved fuel economy and reduced noise.

How it works

Magnetic Selective Ride Control uses a revolutionary damper design that controls wheel and body motion with MRF in the shocks and struts. As a result, drivers feel a greater sense of security, a quieter, flatter ride and more precise, responsive handling, particularly during sudden, high-speed maneuvers.

The system’s onboard computer reacts to wheel inputs from the road-sensing suspension by sending an electronic signal to coils in each damper, changing the fluid’s flow properties. This fluid contains randomly dispersed iron particles that, in the presence of a magnetic field, align themselves into structures adopting a near-plastic state. This action regulates the damping properties of the monotube struts, changing up to 1,000 times per second.

The system isolates and smoothes the action of each tire, resulting in less bouncing, vibration and noise. On bumpy or slick surfaces, the system integrates with traction control to assure maximum stability. It also works with ABS to keep the vehicle balanced and poised. It is the only system without electro-mechanical valves and no small moving parts.

2007 Model Availability [2008 Coming Soon]

Buick	Lucerne
Cadillac	SRX, DTS, STS, XLR, XLR-V, Escalade [2008]
Chevrolet	Corvette