VXI总线多通道压力传感器仿真模块设计与实现

Design and Implementation of a Pressure Sensor Simulation Module Based on VXI bus

摘要:

某型发动机系统主要由综控器、传感器、电机泵、电磁阀等部件组成,综控器是整个系统的核心控制部件,为测试综控器的性能是否符合要求,需要为综控器提供各种工况下的传感器(主要为压力传感器)数据进行仿真试验;采用真实的压力传感器开展上述工作,一方面需要构建复杂的工作环境,难度大、数据精确度难以保证,另一方面地面环境下的传感器信号变化难以实时调整,难以满足数据快速变化的需要;基于以上因素考虑,给出了一种基于VXI总线的多通道压力传感器仿真模块的设计方法,模块共有24路压力传感器电路,每路独立配置输出;模块以“VXI总线接口电路+VXI总线功能电路”的结构进行布局,VXI总线接口电路主要包括“CPLD+双口RAM”,对VXI总线指令进行解释、译码；VXI总线功能电路主要包括“96系列单片机+DA输出电路+两线压力传感器电路”,完成对真实传感器输出信号的电气特性仿真模拟;模块的驱动程序在Lab Windows/CVI6.0的环境下编制,供用户进行程序调用和快速操作使用;该模块已在VXI总线测试系统中得到应用,实际情况表明,模块的输出精度高、信号调整方便、响应快,满足了综控器仿真深度测试的要求。

Abstract:

The system of a certain type of engine consists of an integrated controller, sensors, a motor pump and solenoid valves, and the integrated controller device is the core of the whole system. To assess the performance of the integrated control device whether meets the requirements, simulation experiments were done based on all kinds of operating mode data of the sensors (mainly are pressure sensors). On one hand, using real pressure sensor to carry out the above work, it needs to build a complex working environment so that the workload is tremendous, and data precision is difficult to ensure. On the other hand, it is difficult to adjust the sensor signal in real time. Considering the above considerations, the paper presents a design of multi-channel pressure sensor simulation module based on VXI bus, which consists of 24 pressure sensor circuits that every single is an independent output. The module is based on VXI bus interface circuit and VXI bus functional circuit, and VXI bus interface circuit is mainly composed of CPLD and dual-port RAM with interpretation and decoding of VXI bus instruction; VXI bus functional circuit includes 96 series single chip microprocessor, DA output circuit and a dual-line pressure sensor circuit, completing real sensor output signal electrical characteristics simulation. The module driver compiling in Lab Windows/CVI6.0 environment is prepared for the user to carry out the procedure call and fast operation. The module has been applied in the VXI bus test system, and the practice shows that the module's output accuracy is high, the signal adjustment is easy to act, and the response is fast. It meets the requirements of the simulation deep test of the controller.