Browse Publications Technical Papers 2018-01-1487

Engine Sound Quality Development Using Engine Vibration 2018-01-1487

Automotive companies are trying to enhance the customer’s impression in their vehicles by improving engine sound quality. The target of this sound quality is to create a brand sound that is preferred by their customers as well as quietness of interior noise. Over the past decade there have been many studies in field of automotive sound quality. These have included the technologies such as tuning of intake orifice and exhaust orifice, tuning of structure-borne, intake feedback devices, active exhaust valves, ANC (Active Noise Cancellation) and ASD (Active Sound Design). The three elements of the sound that affect the impression of the customer are known as order arrangement, frequency balance, and linearity. Here, the most important thing in sound quality development is the order arrangement. With traditional development methods by the tuning of existing vehicle systems, it is not possible to achieve the desired order arrangement, and technologies such as ASD and ESG (Engine Sound Generator) have recently been applied to vehicles. However, since ASD reproduces a synthetic sound and ESG creates a desired sound by exciting the body with a vibrating exciter, it is difficult to say that sound produced by these technologies is real engine sound. This paper describes an ESEV (Engine Sound by Engine Vibration) technology. ESEV uses engine vibration using a vibration sensor to provide real engine sound. The vibration level of the engine reacts instantaneously to the speed and load of the car reflecting the driver's request. Therefore, we extract the main engine orders from the vibration component in real time to make the desired order arrangement. Using additional signal processing, the desired engine sound is implemented in the vehicle interior through the loudspeaker system. This sound is unquestionably authentic.


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