Dither signals with particular application to the control of windscreen wiper blades

Abstract

This study verifies chaotic motion of an automotive wiper system, which consists of two blades driven by a DC motor via the two connected four-bar linkages and then elucidates a system for chaotic control. A bifurcation diagram reveals complex nonlinear behaviors over a range of parameter values. Next, the largest Lyapunov exponent is estimated to identify periodic and chaotic motions. Finally, a method for controlling a chaotic automotive wiper system will be proposed. The method involves applying another external input, called a dither signal, to the system. Some simulation results are presented to demonstrate the feasibility of the proposed method.

Application of input shaping control strategy for reducing chatter noise in the automotive wiper system

“…where K is as in equation (11). The robustness of the input shaper can further be increased by taking and solving the second derivative of the vibration in equation (8).…”

“…There is wealth information on the study of wiper noise and vibration [1][2][3][4][5][6][7][8][9][10][11]. They are from analytical, numerical and experimental approaches and sometimes combination of them.…”

“…In addition to these studies, there are various approaches have been proposed in order to reduce noise and vibration of the wiper system. Amongst them are blade configuration, blade material and surface treatment [10], and dither signal [11]. This paper puts forward a simple control technique, namely, input shaping to reduce chatter noise and vibration in the automotive windshield wiper system.…”

A theoretical analysis of friction and vibration characteristics of wiper reversal process

“…To reduce the friction coefficient of blade 21,22 and conduct the active control, [23][24][25][26][27][28] furthermore, some theoretical measures according to the mechanism of vibration and noise of the wiper-windscreen friction system, such as the structure modifications, 16,21,22 the elimination of friction-negative slope characteristic of relative sliding velocity, [22][23][24] were proposed. The attack angle of wiper blade and the pressure of scraper arm are controlled within a certain speed range.…”

A Multi-objective, active fuzzy force controller in control of flexible wiper system

“…Based on a practical wiper system, it is verified that it not only effectively stabilizes the chaotic and sub-harmonic motions, but also minimizes the amplitude of vibrations of the wipers throughout the whole operating range. Chaotic motion and its control in an automotive wiper system, which consists of two blades driven by a DC motor via one link was analyzed by Chang and Chen (2006). The dynamical behaviours were numerically investigated by means of time responses, Poincare maps and frequency spectra.…”