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氣比例閥高壓驅(qū)動(dòng)與低壓PWM的雙壓控制模式
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    摘要:

    為了保證電—?dú)獗壤y具有良好的線性度和提高高速開關(guān)閥的響應(yīng)速度，提出對高速開關(guān)閥采用高壓驅(qū)動(dòng)與低壓雙脈寬調(diào)制(PWM)相結(jié)合的雙壓控制模式，即通過高壓（24 V）縮短閥的開啟時(shí)間，低壓PWM（6 V）按照PID方法控制脈寬，用于降低閥體功耗和縮短關(guān)斷時(shí)間。設(shè)計(jì)了以ATmega8L單片機(jī)為控制核心的電〖CD*2〗氣比例閥，并進(jìn)行了試驗(yàn)。測試結(jié)果表明，高壓驅(qū)動(dòng)與低壓PWM的控制模式使得高速開關(guān)閥的開啟時(shí)間縮短為0.8 ms，關(guān)閉時(shí)間為0.3 ms，調(diào)壓閥的總功耗僅為2.18 W，明顯低于國外同類產(chǎn)品。

    Abstract:

    With the aim to insure the better linear degree of electro-pneumatic proportional valve and raise the response speed of its speed on-off valves, a doubled-voltage control mode with high voltage driving and low voltage PWM was proposed. In the mode, the high voltage (24 V) could shorten the open time, and the low voltage PWM (6 V) could reduce the power loss and shorten the closing time according to the pulse width controlled by PID. An electro-pneumatic proportional pressure valve controlled by a MCU ATmega8L was designed based on the mode. The tested results show that, using the mode of high voltage driving and low voltage PWM, the open time of the high speed on-off valve is reduced to 0.8 ms, the turnoff time is 0.3 ms, and the total power consumption is 2.18 W. 

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劉志珍,張忠祥,侯延進(jìn).氣比例閥高壓驅(qū)動(dòng)與低壓PWM的雙壓控制模式[J].農(nóng)業(yè)機(jī)械學(xué)報(bào),2008,39(7):159-163.[J]. Transactions of the Chinese Society for Agricultural Machinery,2008,39(7):159-163.

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