无人驾驶拖拉机电控液压转向系统的可靠性测试.doc

本科毕业 摘 要 本文主要针对我校自主研发的无人驾驶拖拉机电控液压转向系统，开展电磁阀可靠性测试，检验电磁阀对长期通电和频繁通断电的耐受性。 分析了现有电控液压转向系统的组成，包括有过滤器、定量泵、手动换向阀、转向器、液压泵、压力表、溢流阀、二位三通换向阀、三位四通电磁比例换向阀和油箱等，描述了其基本工作原理。在工作过程中，二位三通换向阀需要频繁通断以实现手动和自动油路的切换，直接关系到系统工作的稳定性和可靠性。因此，本文设计了一套二位三通换向阀的可靠性测试系统。该测试系统包括：基于AT91SAM9263的嵌入式系统开发板、电磁阀驱动放大电路和美国HYDRAFORCE公司生产的SV-10-31N-24VDC电磁阀。基于SBC6330XARM开发板，开发了测试程序。ARM板主控电路产生PWM信号，通过驱动电路放大信号，控制电磁阀油路。 本次测试一共进行了4中不同的控制信号测试，分别为周期为2秒、1秒、0.6秒的方波以及持续输出3.3V高电平。2秒、1秒和0.6秒的方波测试时间为30分钟，持续输入高电平的测试时间为60分钟。测试结果表明：ARM主控板和驱动电路控制下有效地工作，电磁阀对长期通电和频繁通断具有较好的耐受性。 关键词：SBC6330X 驱动电路 电磁阀 Turning to the Reliability of the Testing System of Unmanned Tractors Hydraulic Wu Zhangrong (College of Engineering, South China 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?on-off. The?analysis?of?the?existing?electric?hydraulic?steering??system?composition,?comprising?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?electromagnetic?proportion??reversing?valve?and?the?mailbox,?the?basic?working?principle??described.?In?the?work?process,?two?position?three?way??directional?control?valve?need?frequent?on-off?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?comprises:?driver?development?board,??AT91SAM9263?embedded?system?SV-10-31N-24VDC?solenoid?valve??solenoid?valve?amplification?circuit?and?the?United?States?of??America?HYDRAFORCE?company?production?based?on.?Based?on?the??SBC6330XARM?development?board,?development?test?program.?ARM??main?control?circuit?generates?a?PWM?signal,?th