Patent ID: 6427112
Filing Date: 2002-07-30
Classification: F02M,G01M

Abstract:
A method of tuning a vehicle having an interior and an engine operable over a range of engine speeds, the engine having an air in/out system including an induction system inlet port and an exhaust system outlet port, the method comprising:measuring a plurality of inlet frequency responses at the inlet port to a plurality of different engine speed inputs, each inlet response including an amplitude response and a phase response; measuring a plurality of outlet frequency responses at the outlet port to a plurality of different engine speed inputs, each outlet response including an amplitude response and a phase response; determining an inlet transfer function that generates a frequency response, including an amplitude response and a phase response, at the vehicle interior to an input at the inlet port; determining an outlet transfer function that generates a frequency response, including an amplitude response and a phase response, at the vehicle interior to an input at the outlet port; determining an interior noise spectrum based on the plurality of inlet frequency responses, the inlet transfer function, the plurality of outlet frequency responses, and the outlet transfer function; and modifying the engine air in/out system based on the interior noise spectrum to result in a different interior noise spectrum.