Engine sounds and exhaust system sounds can be quite perceptible in the vehicle interior. Conventional passive methods to reduce the transmission of such noise to the interior of the vehicle include strengthening the structural rigidity of the vehicle body and increasing the sound insulation layer. This, in turn, leads to increased vehicle weight and higher fuel consumption. Also, modern manufacturers are actively introducing technologies to reduce the number of engine cylinders or turn off some of the cylinders during operation at low power. This measure brings unpleasant pulsations of the engine sound and makes the engine noise inharmonious and unpleasant to the ear..

The high-performance Engine Noise Attenuation (ENA) controller uses the engine RPM signal as a reference to generate a sound wave that is opposite in phase to the engine vibration-induced noise. In addition, error microphones mounted in the roof of the car provide feedback on the amplitude and phase to refine noise-cancelling effects. As a result, ENA makes it easier to reduce use of conventional damping materials. OEMs can implement cylinder deactivation, leading to improved fuel consumption and lower CO2 emissions.

ENA facilitates a potential reduction in usage of conventional damping materials, thereby reducing overall vehicle weight, fuel consumption and CO2 emissions.

ENA reduces low-frequency engine boom and exhaust noise, thereby staving off driver drowsiness.
ENA creates a peaceful, quiet interior for a relaxing atmosphere that is also ideal for enjoying your favorite music.
Unlike competitor systems, the ENA technology ensures music signals remain unaffected by noise cancellation.
How it works