For decades, car manufacturers have battled intrusive engine vibrations, road surfaces, and tire noise. Early attempts involved layering vehicles with kilos of sound-deadening materials. Today, electronic noise cancellation systems, proven effective in headphones and high-end cars, are evolving thanks to ZF’s new Active Noise Reduction technology for vehicle chassis.
The Challenge of Tire Noise
The most stubborn source of noise remains tire-generated sound. Unlike predictable engine vibrations linked to crankshaft revolutions, tire noise is complex and harder to counteract. ZF’s system tackles this directly by using electronic cancellation.
How Active Noise Reduction Works
ZF’s approach doesn’t rely on costly microphones or speakers. Instead, it leverages the firm’s Smart Chassis Sensor, combined with an acceleration sensor, to measure vibrations traveling from tires to the cabin via suspension components. An algorithm identifies the signature noise patterns of tire cavities (typically around 200Hz). The CubiX chassis control platform then generates a counter-signal, triggering microscopic adjustments within the semi-active dampers.
These “micromovements” are too subtle to compromise suspension performance – handling and roadholding remain unaffected. The key is that the dampers themselves become part of the noise-cancellation process.
A History of Noise Cancellation
The concept isn’t new. Lotus Engineering demonstrated a similar system in the early 1990s, using a stripped-down Citroën AX to prove that noise cancellation could eliminate booming sounds with the flick of a switch. ZF’s innovation lies in integrating this technology directly into the dampers, eliminating the need for cabin microphones or audio speakers.
Market Impact
ZF, already a market leader in semi-active dampers (supplying 40% of the global market), could bring this technology to lower-priced cars. The system bypasses the need for expensive acoustic solutions typically reserved for luxury vehicles. This means quieter rides for a broader range of drivers.
ZF’s micro-movement approach could make noise cancellation a standard feature in more vehicles, finally addressing one of the most persistent challenges in automotive engineering.
