公开(公告)号：CA2272394A1

公开(公告)日：1998-07-02

申请号：CA2272394

申请日：1997-12-18

Applicant: UNITED TECHNOLOGIES CORP

Inventor： CHRISTIANS DOUGLAS ,  HARRIS MARK L ,  KLINE ERIN G ,  WILMOT GEORGE E JR

IPC: F25B9/00 ,  B64D13/06

Abstract: An air cycle air conditioning system (10) comprises a first air source (18) for supplying cooling air and a second air source (16) for supplying high temperature system air. The system (10) further includes a device (14) for transferring heat from the high temperature air (16) and producing conditioned air having a temperature substantially lower than the high temperature system air (16). A mechanism (20) for directing the conditioned air to the high temperature air prior to the high temperature air entering a component of the system (35) for decreasing the temperature of the high temperature system air, prior to it contacting the system component is also provided. An air cycle air conditioning (10) method comprises the steps of supplying cooling air (18) and high temperature system air (16) to a system component (14); transferring heat from the high temperature system air (16) and producing conditioned air having a temperature substantially lower than the higher temperature system air (16), and mixing at least a portion of the conditioned air and the system air (16) prior to its contact with the system component (14) for decreasing the temperature of the high temperature air (16) prior to reaching the system component (14).

公开(公告)号：CA1284682C

公开(公告)日：1991-06-04

申请号：CA516645

申请日：1986-08-22

Applicant: UNITED TECHNOLOGIES CORP

Inventor： HARNER KERMIT I ,  SCHNEIDER ROY W ,  HARRIS MARK L

IPC: B64C11/50 ,  H02P5/52 ,  G05D13/62 ,  B64C11/46

Abstract: Improved Propeller Synchrophaser An improved slave propeller synchrophaser (10) includes a first control (14) responsive to a phase difference signal (28) and a phase difference reference signal (26) for providing a phase error signal (112) and for providing a propeller speed reference bias signal (40) for a speed governor (46), and also includes, according to the present invention, a second control (12) responsive to the phase error signal (112) for providing an engine power reference bias signal (80) for an engine power control for providing a very limited amount of propeller fine speed control within the dead band of the propeller speed governor while at the same time substantially maintaining engine power at the commanded power level.

公开(公告)号：CA2250060A1

公开(公告)日：1997-10-16

申请号：CA2250060

申请日：1997-04-07

Applicant: UNITED TECHNOLOGIES CORP

Inventor： ZAGER MICHAEL ,  CHRISTIANS DOUGLAS L ,  DREW DIANE G ,  HARRIS MARK L ,  KLINE ERIN G

IPC: B64D13/08 ,  B64D13/06 ,  F24F3/06 ,  F24F13/08

Abstract: An integrated environmental control system (10) is disclosed for providing conditioned supply air to loads such as a passenger cabin (56) of an aircraft. The system comprises at least two shafts (70, 78), each shaft having a fan (72, 80), compressor (74, 82), and turbine (76, 84) mechanically secured to the shaft (70, 78); common heat transfer components including primary (86) and secondary (88) heat exchangers, a reheater (90), and a condenser (92) with a water collector (130); fluid transfer lines that deliver the supply air separately through the compressors and turbines of each shaft (70, 78) and deliver the supply air in common through the common heat transfer components (86, 88, 90) to the load; and shutoff valves (96, 98) secured in fluid communication with each turbine (76, 84). Upon interruption in the the flow of cooled supply air out of a particular turbine (76, 84) secured to any of the shafts (70, 78), a shutoff valve (96, 98) shuts off transfer of the supply air to that particular turbine (76, 84) on that interrupted shaft (76, 78) and the remaining shafts and their respective fans (72, 80), compressors (74, 82), turbines (76, 84), and the common heat transfer components (86, 88, 90) continue to receive, condition and deliver the supply air to the load in a redundant operating mode.

公开(公告)号：CA1242514A

公开(公告)日：1988-09-27

申请号：CA518661

申请日：1986-09-19

Applicant: UNITED TECHNOLOGIES CORP

Inventor： SCHNEIDER ROY W ,  HARRIS MARK L

IPC: G05B11/32 ,  G05B11/42

Abstract: INTEGRAL CONTROL OF A DEPENDENT VARIABLE IN A SYSTEM HAVING AT LEAST TWO INDEPENDENT VARIABLES WHICH INFLUENCE THE DEPENDENT VARIABLE A method and apparatus for integral control of a dependent variable in a system having at least two independent variables which influence the dependent variable is disclosed. A difference signal indicative of the difference between the sensed dependent variable and a reference is integrated and provided to a hysteresis transfer function. The output of the transfer function is subtracted from the integrated difference signal and the resulting signal is used to control an independent variable which thereby influences the dependent variable only for small magnitude signal variations in the integrated signal. The integrated signal is used to control another independent variable for large magnitude signal variations in the integrated signal. The other independent variable is typically only capable of influencing the dependent variable for large magnitude signal variations.