Automotive Air Induction
|
|
Automotive Air Induction |
| Company |
Customer Requirement: Low frequency induction noise was too loud and did not have the spectral characteristics that the customer desired. The automotive engine intake system emitted a predominantly tonal noise spectra as the engine sweeps the rpm range. The customer wanted to reduce some of the tones and acoustically reinforce others. System Description:
Active sound control offered a new approach to the control of induction noise without using large and complex passive resonators. An active system was constructed to demonstrate the effectiveness of this approach. The system layout is shown in Figure 1. The components consist of a reference sensor, a residual sensor and a secondary source. The durability on the induction system was very good, due to the clean, cool airstream exposed to all the components. The control system hardware included a Texas Instruments TMS320C33x based prototype controller and an integrated Pulse Width Modulated PWM amplifier. Results: The testing and development was performed on a vehicle with a 4.0 liter V8 engine using a dynamometer. The engine speed was swept over the engine rpm to test the dynamic performance of the system. Prototype systems were installed on a variety of vehicles. The active induction system has proven to be functional and effective tool at reducing the engine orders and creating the desired induction sound quality. Excellent low frequency performance can be achieved without the restriction and volume often associated with passive techniques. The additional flexibility of being able to control the actual sound spectrum emitted from the induction system has provide a new tool for the customer in their design efforts.
|
|
Copyright 2005, Applied Signal Processing, Inc. |
