Data Acquisition Node in Landing Gear Based on Dual-Redundancy CAN

Acquisition node,as the basic unit of the distributed data acquisition system,is an important component of landing gear integrated control system.It requires the acquisition and processing capability for a large number of data,a flexible sampling period to meet the real-time requirements of the system,and a dual redundant CAN interface to achieve bus error processing and passive bus switching functions.According to the requirements of the general technical indicators,the Texas Instruments DSP chip TMS320F2808 is chosen.With its 12 bit on-chip ADC and a 16-channel analog switch,the acquisition node can collect and process 31-channels analog signals.In addition,the DSP also have two enhanced CAN controllers,which can support the bus error processing in node,and respond the bus detection and switching orders from main node by software design.The actual test results show that the collection node works stably.It can meet the performance requirements of the control system.