公开(公告)号：US4998949A

公开(公告)日：1991-03-12

申请号：US282557

申请日：1988-12-12

申请人： Hugh F. Cantwell

发明人： Hugh F. Cantwell

IPC分类号： F02C9/28 ,  F02C9/54 ,  G05D13/04

CPC分类号： F02C9/54 ,  F02C9/28 ,  G05D13/04 ,  F05D2270/021

摘要： A fuel control system for a three spool gas turbine aeroengine has a fuel contorl unit incorporating an intermediate pressure spool overspeed limiter. A fuel control signal is produced which drives a fuel metering unit to meter the flow of fuel to the engine in accordance with control and sensor inputs as acted upon by predetermined control laws incorporated in the fuel control unit. The engine has variable inlet guide vanes (VIGV's) in one or more of its compressor stages and a safety problem arises in that if the VIGV's fail at an angle for low engine speed while the engine is accelerating to a high speed, the rotational speed of the intermediate pressure spool can increase very quickly. This can lead to overshooting of maximum acceptable levels of spool speed before known overspeed limiters have time to regain control.The problem is solved by incorporating an overspeed limiter function for the intermediate pressure spool whose speed limit setting is not just an upper limit as previously, but which varies between lower and upper limits as a function of at least one other internal working parameter of the engine such as the speed of the high pressure spool. The arrangement is such that whenever actual spool speed exceeds the variable limit, a signal is generated which is proportional to the difference between actual spool speed and the variable limit and which is used to reduce the fuel flow to the engine.

摘要翻译： 用于三个卷轴燃气涡轮机航空发动机的燃料控制系统具有包括中间压力卷轴超速限制器的燃料控制单元。 产生燃料控制信号，该燃料控制信号驱动燃料计量单元，以根据控制和传感器输入来计量燃料到发动机的流量，该控制和传感器输入通过结合在燃料控制单元中的预定控制规则起作用。 发动机在其一个或多个压缩机级中具有可变的入口导向叶片（VIGV），并且出现安全问题，因为如果在发动机加速到高速时VIGV以低发动机转速成角度失效，则转速 中压阀芯可以非常快地增加。 在已知的超速限制器有时间重新获得控制之前，这可能导致卷筒速度的最大可接受水平超标。 该问题通过结合用于中间压力阀芯的超速限制器功能来解决，该限速器的速度限制设置不仅仅是先前的上限，而是在下限和上限之间变化，这是作为发动机的至少一个其他内部工作参数的函数 例如高压阀芯的转速。 这种布置使得每当实际的滑阀速度超过可变极限时，产生与实际滑阀速度和可变极限之间的差成比例的信号，并且用于减少到发动机的燃料流量。

公开(公告)号：US4987737A

公开(公告)日：1991-01-29

申请号：US418721

申请日：1989-10-03

申请人： Hugh F. Cantwell

发明人： Hugh F. Cantwell

IPC分类号： F01D21/02 ,  F02C7/232 ,  F02C9/28

CPC分类号： F01D21/02 ,  F02C7/232 ,  F02C9/28 ,  F05D2270/021

摘要： A fuel control system for gas turbine aeroengine includes an overspeed limiter unit operative to limit fuel flow when engine speed exceeds a predetermined safe value. It is conventional for such overspeed limiters to be activated only in the event of an overspeed, so as to obviate the possibility that the limiter unit may fail unnoticed while the unit is dormant, the invention utilises the limit unit as an active part of the fuel control system on a continuous basis. Specifically, the overspeed limiter unit is used to control the pressure drop across a fuel metering unit as a function of engine speed, except when it is actually performing its overspeed limiting task. Specific means of accomplishing this are disclosed. In this way, any failure in the limiter unit will be immediately apparent due to its effect on the functioning of the system, and appropriate action can be taken.

摘要翻译： 用于燃气轮机航空发动机的燃料控制系统包括超速限制器单元，当发动机转速超过预定的安全值时可操作以限制燃料流量。 常规的是这种超速限制器仅在超速的情况下被激活，以便消除限制器单元在单元休眠时不被注意的可能性，本发明利用限制单元作为燃料的活性部分 控制系统。 具体来说，超速限制器单元用于控制燃料计量单元上的压降，作为发动机转速的函数，除非它实际上执行其超速限制任务。 公开了实现这一点的具体方法。 以这种方式，限制器单元的任何故障将由于其对系统功能的影响而立即显现，并且可以采取适当的动作。

公开(公告)号：US4380898A

公开(公告)日：1983-04-26

申请号：US208816

申请日：1980-11-20

申请人： Hugh F. Cantwell

发明人： Hugh F. Cantwell

IPC分类号： F02C9/28

CPC分类号： F02C9/28 ,  F05D2270/051

摘要： A gas turbine engine fuel system of the type using the rotational speed of the high pressure spool as the main control parameter has a trimmer device which reduces the effect of variation of engine geometry in cold starts etc. The trimmer uses the throttle lever angle and engine inlet pressure to compute the desired value of a thrust-related parameter such as weighted mean exhaust pressure, this desired value being compared with the actual value to produce a trim input to the main fuel control unit.

摘要翻译： 使用高压阀芯的旋转速度作为主要控制参数的燃气轮机发动机燃料系统具有减速装置，其减少了冷启动时发动机几何形状的变化的影响。修剪器使用节气门杆角度和发动机 入口压力以计算推力相关参数（例如加权平均排气压力）的期望值，将该期望值与实际值进行比较以产生到主燃料控制单元的修整输入。

公开(公告)号：US5003769A

公开(公告)日：1991-04-02

申请号：US370797

申请日：1989-06-23

申请人： Hugh F. Cantwell

发明人： Hugh F. Cantwell

IPC分类号： F01D17/06

CPC分类号： F01D17/06

摘要： A simple rotary bobweight overspeed governor mechanism is conveniently incorporated in a main fuel control system for a gas turbine aeroengine in order to prevent overspeeds of one and more of its compressor/turbine rotating spools. In order to prevent so-called "dormant" failures of the overspeed governor mechanism going undetected, the invention provides automatic checking of governor function by means of a microswitch linked to a main digital electronic controller of the fuel control system. The position of a spindle in the governor mechanism is proportional to the speed of the spool from which it is driven and each time the spindle is at the position which should correspond to a predetermined proportion of the maximum allowable spool speed, the microswitch is actuated and signals the electronic controller. The latter already receivers a spool speed signal from a tachometer on the engine and if the microswitch signal oocurs at the predetermined proportion of maximum spool speed as measured by the tachometer, the electronic controller outputs a validation signal, otherwise it outputs a warning signal.

摘要翻译： 简单的旋转摆锤超速调速器机构方便地结合在用于燃气轮机航空发动机的主燃料控制系统中，以便防止其一个或多个压缩机/涡轮旋转阀芯的超速。 为了防止超速调速器机构的所谓“休眠”故障未被发现，本发明通过连接到燃料控制系统的主数字电子控制器的微型开关来自动检查调速器功能。 主轴在调速器机构中的位置与其被驱动的卷轴的速度成比例，并且每当主轴处于应该对应于最大允许卷轴速度的预定比例的位置时，微动开关被致动， 向电子控制器发信号。 后者已经接收到来自发动机上的转速计的线轴速度信号，并且如果微动开关信号以由转速计测量的最大线轴速度的预定比例产生，则电子控制器输出有效信号，否则输出警告信号。

公开(公告)号：US4444008A

公开(公告)日：1984-04-24

申请号：US342227

申请日：1982-01-25

申请人： Hugh F. Cantwell

发明人： Hugh F. Cantwell

IPC分类号： F02C9/28

CPC分类号： F02C9/28 ,  F05D2270/02 ,  F05D2270/071

摘要： A fuel control system for a gas turbine engine comprises a main fuel controller which varies the fuel flow to the engine in accordance with the engine pressure ratio and an idling fuel control arrangement. Control of idling fuel flow on a pressure ratio basis is somewhat wasteful of fuel. Therefore in the present invention the idling fuel control arrangement is arranged to control to a constant value of engine HP rotor speed. In the embodiment a variable bleed orifice is allowed to reduce the control pressure which operates the main fuel valve.

摘要翻译： 用于燃气涡轮发动机的燃料控制系统包括主燃料控制器，其根据发动机压力比改变对发动机的燃料流量和空转燃料控制装置。 基于压力比的空转燃料流量控制有点浪费燃料。 因此，在本发明中，空转燃料控制装置被布置成控制到发动机HP转子转速的恒定值。 在该实施例中，允许可变泄放孔减小操作主燃料阀的控制压力。

公开(公告)号：US4437303A

公开(公告)日：1984-03-20

申请号：US320126

申请日：1981-11-10

申请人： Hugh F. Cantwell

发明人： Hugh F. Cantwell

IPC分类号： F02C9/28

CPC分类号： F02C9/28 ,  F05D2270/021 ,  F05D2270/051 ,  F05D2270/71

摘要： A fuel control system for a gas turbine engine comprises a main steady-state fuel control unit which adjusts the fuel flow to the engine to produce an approximation to a desired thrust and a trimmer device which trims the fuel flow demanded by the main unit to produce a closer approximation to the desired thrust. During transients such as accelerations a trimmer suitable for steady operation will apply zero trim until the desired thrust is almost attained, when an amount of trim may have to be applied rapidly. This can lead to overshoots.To mitigate the problem the trimmer is provided with a model of the main control unit which derives an approximation to the trim which will be required when the steady state is reached. This is applied to the main unit throughout the transients, and when the desired thrust is achieved only second-order changes need to be made.

摘要翻译： 用于燃气涡轮发动机的燃料控制系统包括主稳态燃料控制单元，其调节到发动机的燃料流量以产生对期望推力的近似，以及修整装置，其修剪由主单元要求产生的燃料流量 更接近于期望的推力。 在诸如加速度的瞬变期间，适于稳定操作的修剪器将应用零修整，直到几乎可以获得期望的推力，当必须快速施加修剪量时。 这可能会导致过冲。 为了减轻问题，修剪器设置有主控制单元的模型，该模型导出当达到稳定状态时所需的修剪的近似值。 这在整个瞬变中应用于主单元，并且当实现期望的推力时，仅需要进行二阶变化。

公开(公告)号：US4528812A

公开(公告)日：1985-07-16

申请号：US513861

申请日：1983-07-14

申请人： Hugh F. Cantwell

发明人： Hugh F. Cantwell

IPC分类号： F02C9/28 ,  G05B23/02

CPC分类号： F02C9/28 ,  F05D2270/021 ,  F05D2270/094

摘要： A fuel control system for a gas turbine engine comprises a main fuel controller and an overspeed limiter arranged to prevent overspeed of the engine in the case of a fault in the main controller. To ensure that the limiter is tested regularly, the logic capacity of the main controller (which is preferably a digital electronic unit) is used to vary the parameters of the limiter each time the engine is started up. This variation is such as to cause the limiter to operate and produce an observable reduction in the engine speed which is detected by the main controller and uses as an indication of correct limiter operation.

摘要翻译： 用于燃气涡轮发动机的燃料控制系统包括主燃料控制器和超速限制器，其布置成在主控制器中发生故障的情况下防止发动机超速。 为了确保定期测试限位器，主控制器（最好是数字电子单元）的逻辑容量用于每次启动发动机时改变限制器的参数。 这种变化使得限制器工作并且产生由主控制器检测到的发动机速度的可观察到的降低，并且用作正确限制器操作的指示。