【正文】 Agricultural University, Guangzhou 510642, China)Abstract:This paper mainly aim at my school unmanned tractors hydraulic steering system, carry out the solenoid valve solenoid valve reliability test, test of tolerance is energized for a long time and frequent onoff.The analysis of the existing electric hydraulic steering system position, prising a filter, the quantitative pump, a manual reversing valve, steering gear, hydraulic pump, pressure gauge, pressure relief valve, reversing valve, two three three position four way electromagic proportion reversing valve and the mailbox, the basic working principle described. In the work process, two position three way directional control valve need frequent onoff switch to realize manual and automatic oil, directly related to the stability and reliability of the system. Therefore, this paper designed a reliability test system of a set of two position three way reversing valve.The test system prises: driver development board, AT91SAM9263 embedded system SV1031N24VDC solenoid valve solenoid valve amplification circuit and the United States of America HYDRAFORCE pany production based on. Based on the SBC6330XARM development board, development test program. ARM main control circuit generates a PWM signal, through the drive circuit of signal amplification, electromagic valve control circuit.The tests were conducted in different control signal test 4, respectively, a period of 2 seconds, one second, seconds of Fang Bo and continuous output high level. 2 seconds, one second and second square wave test time is 30 minutes, sustained high level input test time is 60 minutes. The test results show that: ARM main control board and a driving circuit control work effectively, the solenoid valve on the longterm electricity and frequent onoff has better tolerance.Key words: SBC6330X drive circuit electromagic valveI目 錄1 前言 .......................................................................................................................................1 研究背景 ...........................................................................................................................1 研究目的 ...........................................................................................................................1 研究意義 ...........................................................................................................................1 國內(nèi)外研究狀況 ...............................................................................................................12 拖拉機電控液壓轉(zhuǎn)向系統(tǒng)原理 ...........................................................................................3 拖拉機原有轉(zhuǎn)向系統(tǒng) .......................................................................................................3 拖拉機電控液壓轉(zhuǎn)向系統(tǒng)的工作原理 ...........................................................................5 待測試二位三通換向閥的工作特性 ...............................................................................83 液壓轉(zhuǎn)向系統(tǒng)測試電路設(shè)計 ...............................................................................................8 ARM 主控電路 .................................................................................................................9 SBC6300X 開發(fā)板 CPU 規(guī)格 .......................................................................................9 SBC6300X 開發(fā)板主板功能接口 ..............................................................................10 SBC6300X 開發(fā)板核心板功能 ..................................................................................11 驅(qū)動電路 .........................................................................................................................11 IRFR9540 芯片簡介 ....................................................................................................124 ARM 主控板控制程序設(shè)計 ..............................................................................................13 開發(fā)板硬件環(huán)境初始化 .................................................................................................13 利用定時器實現(xiàn) IO 引腳的 PWM 信號輸出 ...............................................................135 可靠性測試流程及結(jié)果 .....................................................................................................14 可靠性測試流程 .........................................................