REDUCING FUEL SUPPLY MODULE NOISE with RUBBER STRUCTURE in a VEHICLE TANK APPLICATION

The noise requirements for automotive components have been updated in the recent years due to the consumer demand for low noise inside the cars. Indeed, it was performed an experimental study aiming the reduction of acoustic noise emitted by Fuel Supply Module (FSM), which is installed inside the fuel tank, using a rubber structure under it. The FSM is responsible to deliver sufficient quantities of fuel to the engine and maintain the pressure required for efficient fuel injection in all operating states. The study presents a basic theory regarding the motor noise source identification based on frequency domain analysis as well as noise control by vibration isolation. The present work analyzed the noise performance influence of rubber support under the FSM using a statistical approach, testing twenty-five samples in an anechoic chamber on Robert Bosch Ltda and a data spectrum average analyzed the influence of rubber support on the parts to compare the product results with this component and without. It was also evaluated the influence of the rubber hardness in different noise orders. The average results showed no difference between the different rubber hardness grades on noise, however, removing this structure, has an increase on sound pressure level on the fuel supply module. Consequently, the reported acoustic-noise prove that, for the considered application, the rubber support can reduce acoustic-noise emissions on specific orders.