基于PIC芯片的载重车空调控制器设计

本文针对大多数载重车空调手动控制的情况,开发了一款空调控制器。介绍了控制器的功能、硬件设计原理和软件编制规则。同时简要介绍了控制系统的抗干扰措施。该控制器经过实验验证,运行良好,极大改善了乘坐的舒适性。     

Study on the influence of three-grid assembly thermal deformation on breakdown times and an ion extraction process

In order to study the influence of three-grid assembly thermal deformation caused by heat accumulation on breakdown times and an ion extraction process,a hot gap test and a breakdown time test are carried out to obtain thermal deformation of the grids when the thruster is in 5 k W operation mode.Meanwhile,the fluid simulation method and particle-in-cell-Monte Carlo collision(PICMCC) method are adopted to simulate the ion extraction process according to the previous test results.The numerical calculation results are verified by the ion thruster performance test.The results show that after about 1.2 h operation,the hot gap between the screen grid and the accelerator grid reduce to 0.25–0.3 mm,while the hot gap between the accelerator grid and the decelerator grid increase from 1 mm to about 1.4 mm when the grids reach thermal equilibrium,and the hot gap is almost unchanged.In addition,the breakdown times experiment shows that 0.26 mm is the minimal safe hot gap for the grid assembly as the breakdown times improves significantly when the gap is smaller than this value.Fluid simulation results show that the plasma density of the screen grid is in the range 6?×10~(17)–6?×?10~(18) m~(13) and displays a parabolic characteristic,while the electron temperature gradually increases along the axial direction.The PIC-MCC results show that the current falling of an ion beam through a single aperture is significant.Meanwhile,the intercepted current of the accelerator grid and the decelerator grid both increase with the change in the hot gap.The ion beam current has optimal perveance status without thermal deformation,and the intercepted current of the accelerator grid and the decelerator grid are 3.65 m A and 6.26 m A,respectively.Furthermore,under the effect of thermal deformation,the ion beam current has over-perveance status,and the intercepted current of the accelerator grid and the decelerator grid are 10.46 m A and 18.24 m A,respectively.Performance test results indicate that the breakdown times increase obviously.The intercepted current of the accelerator grid and the decelerator grid increases to 13 m A and 16.5 m A,respectively,due to the change in the hot gap after 1.5 h operation.The numerical calculation results are well consistent with performance test results,and the error comes mainly from the test uncertainty of the hot gap.     

用PIC方法解地下水运动方程

本文应用 PIC 方法对地下水运动方程求出了数值解,并以文献[1]为例,具体计算出了结果.此结果和我们已得出的其它结果相比令人满意.     

μC/OSII在MicrochipMCU上的移植

μC/OSⅡ是一个完整的,可移植、固化、裁减的抢占式实时多任务内核。本文着重介绍了μC/OSⅡ嵌入式操作系统内核在MicrochipPIC18F452单片机上的移植方法和实时应用程序的设计方法。     

CAN总线技术在智能汽车系统中的应用

智能汽车是一种具有自动驾驶功能的汽车,它综合应用了计算机、控制、信息处理、通讯以及传感器等多种技术。使用CAN总线保证了系统内部数据交换的高速性和可靠性。引入了一种带有CAN总线接口的单片机--PIC18F258,介绍了它CAN模块的结构及其在完成通信任务时的工作原理。该方法在人工智能和工业测控领域具有一定应用价值。     

一种GW级3.2cm相对论返波管振荡器的数值模拟

提出了一种3.2cm的相对论返波管振荡器,并利用2.5维粒子模拟软件KARAT研究了引导磁场强度、电子能量、电子束环平均半径、电子束环厚度对输出微波的影响。最后,在电子束为环形电子束(电子束束环平均半径为0.95cm,束环厚度为1mm)、电子束束压为900kV、电子束束流为6.7kA、引导磁场为3.2T时,得到了1.2GW的微波输出。     

基于PIC单片机的电能表时钟误差分析仪的研究

电能表的时钟精确与否将直接影响电能表的精度，因此必须对电能表的时钟误差进行分析。利用PIC单片机实现了复费率电能表误差分析仪的设计。通过多周期同步测频法提高了测量的精度。从系统硬件组成和软件设计思想分别对系统加以介绍。系统实现了复费率电能表误差的快速、准确检定。     

PIC18F2331在无刷直流电动机控制中的应用

介绍了PIC18F2331单片机针对电机控制用的运动反馈模块和功率控制PWM模块，并基于单片机设计了无刷直流电动机控制系统，分析了PIC18F2331单片机在控制系统中的应用，给出了硬件电路设计、软件控制流程图和实验结果。整个系统设计简单、性能可靠、容易实现。     

IEEE 1284并行接口实现

首先介绍了W912 84PIC ,然后给出了基于W912 84PIC的IEEE 12 84并行接口的硬件实现电路图 ,最后在这种电路图的基础上给出了软件实现。     

铁电存储器FM24C04原理及应用

简述了铁电存储器的工作机理以及与其他存储器技术相比所独具的优势，重点介绍了Ramtron公司串行FRAM产品FM24C04的硬件结构，主要特性和具体应用。