The output tracking control problem of nonholonomic chained form systems is studied in this paper and global a time-varying coordinate transformation is introduced to avoid manipulating exponentially converging signals. Then, with the help feature of the proposed controller is that the output tracking control problem of nonholonomic chained form systems is also resolvble without the popular condition of persistent excitation or not converging to zero on reference signals in the previous works. The proposed method is demonstrated and discussed by means of nonholonomic mobile robots and cars with one trailer.
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