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Quasi-Continuous Temperature Control in the Electric Space Heating Process

机译：电加热过程中的准连续温度控制

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Quasi-continuous temperature control is needed when electric space heating is applied to temperature-dependent processes. In such applications, multiposition systems cannot supply the accurate control often required, and quasi-continuous systems have economic and operating advantages over many continuous systems. The reference input of a quasi-continuous system can be a trimmed, optimized, open-loop command derived from the incoming and outgoing quality levels of the process. Feedforward correction for process lag, and overriding commands, can easily be incorporated into such systems. Quasi-continuous characteristics contain a number of discontinuities. Time can be saved by representing these characteristics by a continuous profile. A multitude of intermediate values of manipulated variable can be obtained by new and inexpensive methods. When the heating load must remain intact, phase-discontinuity methods can be used which approximate level-discontinuity control. For fast response processes, phase-controlled SCR's (silicon-controlled rectifiers) can be used. The T-T (temperature-time) diagrams have limitations as representations of quasi-continuously controlled processes. Time domain information can be obtained from the phase plane where quasi-continuous performance resembles a spiral. Nonlinearities can be advantageously introduced into quasi-continuous profiles. Performance is improved by derivative feedback. It is possible to predict quasi-continuous system behavior by means of a 3-dimensional actuating-signal display.
机译：当将电气空间加热应用于依赖温度的过程时，需要进行准连续温度控制。在这样的应用中，多位置系统不能提供经常需要的精确控制，并且准连续系统比许多连续系统具有经济和操作上的优势。准连续系统的参考输入可以是经过调整，优化的开环命令，该命令是根据过程的输入和输出质量级别得出的。可以将过程滞后的前馈校正和覆盖命令轻松合并到此类系统中。准连续特征包含许多不连续性。通过用连续的轮廓表示这些特征可以节省时间。可以通过新的廉价方法获得许多中间变量。当必须保持加热负载完好无损时，可以使用相间断法来近似水平间断控制。对于快速响应过程，可以使用相控SCR（硅控整流器）。 T-T（温度-时间）图作为准连续控制过程的表示形式具有局限性。可以从相位平面获得时域信息，在该相位平面上，准连续性能类似于螺旋形。非线性可以有利地引入准连续轮廓。通过微分反馈可以提高性能。可以通过3维操作信号显示来预测准连续系统的行为。

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