Digital Logic Unit Design Based on Three-Take-Two Redundant Fault-Tolerant Architecture
Aiming at the requirements of high reliability,high safety,high redundancy and high integration of the new generation of rail vehicle control system,in order to enable the on-board computer to quickly,accurately and efficiently complete the network transmission,data computation and output control under the complex operating environment,the digital logic unit(DLU)based on three-take-two redundancy fault-tolerant architecture has been designed,and under the cooperation of the software,it realizes the safety of the vehicle's key control circuits in service function.The control unit adopts a three-take-two redundant control strategy.The program adopts the control logic of preemptive multi-task real-time operation.The system uses power supply modules,signal acquisition module,signal output module and processor module to start and operate circuits in parallel.The outputs use a synchronized calibration signal mechanism with self-feedback correction.Through a comprehensive and comparative analysis of 2 aspects,availability and safety,the realization of the basic functions of the three-take-two architecture DLU under normal operation and the redundant switching function for system operation protection in the failure mode are verified.In the event of single or multiple failures,the three-take-two architecture not only ensures the integrity and reliability of system control,but also maximizes the availability of system resources.This design provides a feasible design solution for DLU to be utilized in practical vehicle applications with high utilization rate and meet high safety levels.
Rail vehicle control systemDigital logic unit(DLU)Three-take-twoRedundancy fault-toleranceVoting strategyFault-oriented safety
NETL
NSTL
万方数据
维普
