Safety limit system for amplitude limit and torque limit redundancy

The invention discloses a safety limit system for amplitude limit and torque limit redundancy, belonging to the technical field of safety of an overhead working truck. The safety limit system comprises an acquisition module, a data computing module and a redundant logic processing module, wherein the acquisition module consists of an angle sensor, a length sensor, a weighting sensor and an oil pressure sensor which are arranged on the overhead working truck; the acquisition module is electrically connected with the data computing module; the redundant logic processing module is electrically connected with the data computing module; and a redundant logic program is arranged in the redundant logic processing module, and is used for detecting whether the current practical amplitude satisfiesan amplitude limit judging condition or whether the current practical torque satisfies a torque limit judging condition and switching output of an action in a dangerous direction off when the currentpractical amplitude/torque