Burst mode dither control of automotive brake squeal

Abstract:

Recent research has demonstrated that the application of open-loop dither control to a brake provides an effective means of suppressing brake squeal. Dither control is a method by which high frequency disturbances are introduced into a system. Dither suppresses the friction induced squeal response at lower frequencies, thus eliminating audible brake squeal. Dither control when applied at 100% duty cycle has been shown to be an effective means of suppressing brake squeal. This paper documents an investigation into the use burst-mode dither control for suppression of brake squeal. Burst mode dither control is characterized by duty cycles of less than 100%. Dither is introduced to a brake by placing a piezoelectric stack actuator in the piston of a floating caliper brake. The piezoelectric stack actuator is driven by a 20 kHz burst mode signal, and the impact upon the squeal is assessed. Burst mode dither with duty cycles as low as 50% are shown to be as effective in suppressing brake squeal as dithering at 100% duty cycle.

Año de publicación:

2001

Keywords:

Fuente:

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