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    HELICOPTER ENGINE CONTROL HAVING YAW INPUT ANTICIPICATION
    72.
    发明申请
    HELICOPTER ENGINE CONTROL HAVING YAW INPUT ANTICIPICATION 审中-公开
    直升机发动机控制有YAW输入预防措施

    公开(公告)号：WO1993004419A1

    公开(公告)日：1993-03-04

    申请号：PCT/US1992007282

    申请日：1992-08-27

    Applicant: UNITED TECHNOLOGIES CORPORATION

    Inventor： UNITED TECHNOLOGIES CORPORATION ,  EBERT, Frederick, J. ,  DRISCOLL, Joseph, T. ,  SWEET, David, H.

    IPC: G05D01/00

    CPC classification number: G05D1/0055 ,  G05D1/0858

    Abstract: A helicopter engine fuel control anticipates sudden changes in engine power demand during yaw inputs to thereby minimize engine and main rotor speed droop and overspeed during yaw maneuvers. The rate (121, 123) of yaw control (107) position change generates (10) a yaw component (104) of a helicopter fuel control (52) fuel command signal (70). The magnitude of the yaw component is also dependent upon the rate of yaw control position change (703). The fuel command signal yaw component (104) is overriden (113, 115) when rotor decay rate (209, 217) has been arrested during a sharp left hover turn (216); when the yaw component is removing fuel (239) during rotor droop (238); and when the yaw component is adding fuel (228) during rotor overspeed (227).

    Abstract translation: 直升机发动机燃料控制预计在偏航输入期间发动机功率需求的突然变化，从而使偏航操纵期间发动机和主转子速度下降和超速最小化。 偏航控制（107）位置变化的速率（121,123）产生（10）直升机燃料控制（52）燃料指令信号（70）的偏航分量（104）。 偏航分量的大小也取决于偏航控制位置变化的速度（703）。 当旋转衰减速率（209,217）在尖锐的左悬停转弯（216）期间被停止时，燃料指令信号偏航分量（104）被覆盖（113,115）; 当偏转分量在转子下垂期间移除燃料（239）时; 并且当偏转分量在转子超速期间添加燃料（228）（227）时。

    BLADE PITCH CHANGE CONTROL SYSTEM
    73.
    发明申请
    BLADE PITCH CHANGE CONTROL SYSTEM 审中-公开
    刀片变焦控制系统

    公开(公告)号：WO1993003960A1

    公开(公告)日：1993-03-04

    申请号：PCT/US1992006687

    申请日：1992-08-11

    Applicant: UNITED TECHNOLOGIES CORPORATION

    Inventor： UNITED TECHNOLOGIES CORPORATION ,  LAMPETER, Robert, J. ,  DUCHESNEAU, Jerome, G.

    IPC: B64C11/38

    CPC classification number: B64C11/38

    Abstract: A pitch change actuation system is disclosed for adjusting the pitch of a variable pitch propeller blade (120) operatively connected for pitch change to a pitch change actuator piston (140). A pitch change control system (10) is operatively connected to the pitch change actuator piston (140) for selectively pressuring the pitch change actuator piston to effectuate a desired change in the pitch of the propeller blades (120). The pitch change control system (10) comprises a primary electrohydraulic valve (30), a protection valve (60), an electronic controller (20) and a protection solenoid (50). During normal operation, the primary electrohydraulic valve (30) is modulated under control of the electronic controller (20) to effect pitch change. In the event of failure of the electronic controller (20), the protection solenoid (50) is operative to activate the protection valve (60) to assume pitch change authority over the primary electrohydraulic valve (30) thereby providing emergency feathering capability, overspeed protection, low pitch stop limit protection, and in place pitchlock despite failure of the electronic controller.

    SIGNAL SELECTION SYSTEM
    74.
    发明申请
    SIGNAL SELECTION SYSTEM 审中-公开
    信号选择系统

    公开(公告)号：WO1992017828A2

    公开(公告)日：1992-10-15

    申请号：PCT/US1992002334

    申请日：1992-03-24

    Applicant: UNITED TECHNOLOGIES CORPORATION

    Inventor： UNITED TECHNOLOGIES CORPORATION ,  TULPULE, Bhalchandra, R. ,  AVRITCH, Steven, A.

    IPC: G05B09/03

    CPC classification number: G05D1/0077 ,  G05B9/03

    Abstract: A signal selection system has input thereto a plurality of redundant input signals (A, B, C, D) having varying values along with signals indicative of the validity of the plurality of input signals, comparison logic (42-52) compares all possible pairwise combinations of the input signals to determine which input signal in each of the input signal pairs has the greater value or to determine if the input signals in each pair have equal values. Selection logic (80) determines which one or more of the values of the input signals from the plurality of valid input signals are to be used to determine the output signal according to a predetermined criterion. The selection logic (80) has a plurality of combinational logic elements arranged to execute predetermined Boolean logic equations in determining which one or more of the values of the input signals from the plurality of valid inputs are to be used to determine the output signal (MID) according to the predetermined selection criterion.

    Abstract translation: 一种信号选择系统，其中各种值（A，B，C，D）的多个冗余输入信号与指示多个输入信号的有效性或其他信号的信号一起被引入。 比较逻辑（42-52）比较输入信号对的所有可能组合，以确定每对中的两个输入信号中的哪一个具有最高值，或者确定每对中的信号 具有相同的价值。 选择逻辑（80）根据预定标准确定将使用多个经确认的输入信号中的哪个输入信号值来确定输出信号。 选择逻辑（80）具有多个组合逻辑元件，所述多个组合逻辑元件被布置成执行预定的布尔逻辑方程以确定多个经验证的输入信号中的哪些（多个）输入信号值将是 ）来确定所述预定选择标准的输出信号（MID）。

    ENVIRONMENTAL CONTROL SYSTEM CONDENSING CYCLE
    78.
    发明申请
    ENVIRONMENTAL CONTROL SYSTEM CONDENSING CYCLE 审中-公开
    环境控制系统冷凝循环

    公开(公告)号：WO1992003338A1

    公开(公告)日：1992-03-05

    申请号：PCT/US1991003529

    申请日：1991-05-20

    Applicant: UNITED TECHNOLOGIES CORPORATION

    Inventor： UNITED TECHNOLOGIES CORPORATION ,  WARNER, John, L.

    IPC: B64D13/08

    CPC classification number: B64D13/06 ,  B64D2013/0688 ,  F05B2220/50 ,  F25B9/004 ,  Y02T50/44 ,  Y02T50/56

    Abstract: In an air cycle environmental control system, a condenser (46) removes water vapor from compressed, ambient, supply air (9) before it is expanded in a first turbine (24). The chilled outlet air (49) from the first turbine (24) is then used as coolant in the condenser (46), absorbing there the heat of vaporization of the condensed water vapor. After passing through the condenser (46), the warmed coolant is then expanded in a second turbine (26). Should the pressure of the supply air fall below predetermined levels, portions of the cycle that degrade performance or become unnecessary are bypassed.

    MACHINE FAILURE ISOLATION USING QUALITATIVE PHYSICS
    79.
    发明申请
    MACHINE FAILURE ISOLATION USING QUALITATIVE PHYSICS 审中-公开
    使用定性物理学的机器故障分离

    公开(公告)号：WO1992001254A1

    公开(公告)日：1992-01-23

    申请号：PCT/US1991004746

    申请日：1991-07-03

    Applicant: UNITED TECHNOLOGIES CORPORATION

    Inventor： UNITED TECHNOLOGIES CORPORATION ,  HAMILTON, Thomas, P. ,  JACOBSEN, Carol, E. ,  PERVEILER, Kevin, J. ,  SIRAG, David, J., Jr.

    IPC: G06F11/22

    CPC classification number: G06F11/2257

    Abstract: A Qualitative Reasoning System performs machine failure isolation by generating a plurality of pending hypotheses (108) which assume the failure of one or more machine components and by testing each of the hypotheses by propagating actual values for machine parameters through confluence equations for the hypothesis being tested. Variables associated with hypotheses of a qualitative physics model are grouped into type I variables and type II variables, wherein any possible value measured for a type I variable is guaranteed to render at least one hypothesis inconsistent and some, but not all, possible values measured for a type II variable will render at least one hypothesis inconsistent. A set of confluences is deemed to be inconsistent by determining that there is no set of values which can be assigned to all unknown variables of the confluences which result in a consistent set of predictions. The value of an unknown variable is determined by iteratively setting the variable to each of its possible values and, for each iteration, propagating the known variables and the value of the unknown variable through confluences of the model. A model instantiator converts computer workstation user input into usable model information and provides other optimizations which reduce the number of confluences and variables of the model.

    Abstract translation: 定性推理系统通过产生多个待决假设（108）来执行机器故障隔离，这些假设假设一个或多个机器组件的故障，并且通过通过用于正在测试的假设的汇流方程传播机器参数的实际值来测试每个假设 。 与定性物理模型的假设相关的变量分为I型变量和II型变量，其中为I型变量测量的任何可能的值被保证使至少一个假设不一致，并且一些但不是全部可能的值被测量 一个II型变量将使至少一个假设不一致。 通过确定没有一组值可以分配给汇合的所有未知变量，导致一组一致的预测，一组汇合被认为是不一致的。 未知变量的值通过迭代地将变量设置为其每个可能值来确定，并且对于每个迭代，通过模型的汇合来传播已知变量和未知变量的值。 模型实例化器将计算机工作站用户输入转换为可用的模型信息，并提供减少模型的汇合和变量数量的其他优化。

    SINGLE STAGE DEMODULATOR WITH REFERENCE SIGNAL PHASE DITHER
    80.
    发明申请
    SINGLE STAGE DEMODULATOR WITH REFERENCE SIGNAL PHASE DITHER 审中-公开
    具有参考信号相位的单级解调器

    公开(公告)号：WO1992000503A1

    公开(公告)日：1992-01-09

    申请号：PCT/US1991004528

    申请日：1991-06-24

    Applicant: UNITED TECHNOLOGIES CORPORATION

    Inventor： UNITED TECHNOLOGIES CORPORATION ,  WINSTON, Charles, R., Jr.

    IPC: G01C19/72

    CPC classification number: G01C19/726

    Abstract: A fiber optic rotation sensor includes a fiber optic coil with light beams counterpropagating therein where the beams are phase modulated with a squarewave carrier at the coil eigenfrequency. The beams recombine at the coil output with a resultant optical intensity which is a measure of the change in sensor rotation rate. The recombined signal also contains an error component due to squarewave carrier imperfections which cause high frequency spikes in the modulated rate signal resulting in rotational rate bias errors. The rotational rate bias errors are reduced by demodulating the modulated rate signal with a demodulator reference signal uniformly phase dithered about the carrier signal.

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