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公开(公告)号：US4217617A
公开(公告)日：1980-08-12
申请号：US944761
申请日：1978-09-22
CPC分类号： F01D21/20 , G01P3/489 , Y02E10/226
摘要： The disclosure sets forth trip circuitry for a rotating shaft machine which includes redundant overspeed protection and means for testing the overspeed protection circuit while the machine remains in operation. Moreover, further protective circuitry is provided for detecting a failure in the speed sensing system. The overspeed protection and the speed sensing failure circuit are each connected to a relay system which may actuate a trip servo valve to a closed position.
摘要翻译： 本公开提出了一种用于旋转轴机器的跳闸电路，其包括冗余超速保护和用于在机器保持运行时测试超速保护电路的装置。 此外，还提供了用于检测速度感测系统中的故障的进一步的保护电路。 超速保护和速度检测故障电路各自连接到继电器系统，其可以将跳闸伺服阀致动到闭合位置。
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公开(公告)号：US4227072A
公开(公告)日：1980-10-07
申请号：US928246
申请日：1978-07-26
CPC分类号： G05D13/02 , G05B11/01 , Y10S388/912
摘要： In the field of closed loop control systems, a reference signal input is compared with a feedback signal to provide an error signal which then initiates corrective action until the feedback signal duplicates the reference signal. Hence, the reference signal may be appreciated as the set point at which the control system should operate. The disclosure relates to a manual input reference signal circuit which may be used to input a desired reference speed signal into a control system circuit for a prime mover. Provision is made for both local and remote manual signal input and priority logic is included for selecting the most appropriate reference signal. Inhibit logic dictates the floor and ceiling for the range of prime mover operation .
摘要翻译： 在闭环控制系统领域，将参考信号输入与反馈信号进行比较，以提供一个误差信号，然后启动纠正措施，直到反馈信号复制参考信号。 因此，参考信号可以被理解为控制系统应当操作的设定点。 本公开涉及一种手动输入参考信号电路，其可用于将期望的参考速度信号输入到用于原动机的控制系统电路中。 提供本地和远程手动信号输入，包括优先级逻辑，用于选择最合适的参考信号。 抑制逻辑决定了原动机运行范围的地板和天花板。
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公开(公告)号：US4270357A
公开(公告)日：1981-06-02
申请号：US83345
申请日：1979-10-10
摘要： Some power plants may produce both power and process steam as output products and may be referred to as cogeneration power plants. This type of power plant may include at least one extraction type steam turbine in order to conveniently output process steam. Sometimes the available power plant steam supply is insufficient to satisfy both load demand and process steam requirements whereupon it may be desirable to prefer load demand over process steam requirements. The present invention is a control system for electronically implementing that preference.
摘要翻译： 一些发电厂可以生产电力和过程蒸汽作为输出产品，并且可以被称为热电联产发电厂。 这种类型的发电厂可以包括至少一个提取型蒸汽轮机，以方便地输出加工蒸汽。 有时，可用的发电厂蒸汽供应不足以满足负载需求和过程蒸汽需求，因此可能希望优先于负载需求超过工艺蒸汽需求。 本发明是用于电子地实现该偏好的控制系统。
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公开(公告)号：US4025762A
公开(公告)日：1977-05-24
申请号：US634138
申请日：1975-11-21
摘要： In a prime mover control system, control over the prime mover is dependent, in part, upon the validity of a reference signal to the control system. Circuitry is provided between a reference signal generator and the control system whereby under normal conditions the reference signal to the control system is the same as the output of the reference signal generator. However, if the reference signal generator output becomes invalid, then a stored reference signal may be substituted for the reference signal generator output by switching from a first signal channel to an alternate second signal channel, each channel selectably interconnecting the reference signal generator and the control system. The output of the second signal channel is periodically updated to follow, with a time lag, the reference signal generator output except when an invalid reference signal generator output is detected whereupon the update of the second signal channel is frozen at a last valid reference signal which is then input into the control system.
摘要翻译： 在原动机控制系统中，原动机的控制部分取决于参考信号对控制系统的有效性。 在参考信号发生器和控制系统之间提供电路，由此在正常条件下，控制系统的参考信号与参考信号发生器的输出相同。 然而，如果参考信号发生器输出变得无效，则可以通过从第一信号信道切换到交替的第二信号信道来将存储的参考信号替换为参考信号发生器输出，每个信道可选地将参考信号发生器和控制 系统。 周期性地更新第二信号通道的输出，除了检测到无效的参考信号发生器输出之外，时间间隔跟随参考信号发生器输出，随后第二信号通道的更新被冻结在最后的有效参考信号， 然后输入到控制系统中。
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