China
In this paper, we investigate a class of planar piecewise linear discontinuous system defined in two zones separated by a straight line. First, we establish necessary conditions for the existence of both crossing and sliding limit cycles in such system. Subsequently, employing the Poincaré compactification technique, we conduct a thorough analysis of the infinite singular points. Finally, we derive the global phase portraits within the Poincaré ball for this class of system, considering five distinct types: C-C, N-N, -, F-F, and S-S configurations.
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