Control In Response To Generator And Prime Mover Conditions Patents (Class 290/40C)
  • Patent number: 5614768
    Abstract: An engine control device comprises generation current detecting means for detecting generation current of the generator, current value fluctuation removing means for removing the fluctuation of the output of the generation current detecting means, and correction quantity calculating means for calculating the correction quantity of intake gas into said engine in accordance with the output of the current fluctuation removing means.
    Type: Grant
    Filed: May 2, 1995
    Date of Patent: March 25, 1997
    Assignee: Mitsubishi Denki Kabushiki Kashia
    Inventor: Toru Tanaka
  • Patent number: 5561358
    Abstract: A variable speed pumping up generator includes a first speed control unit for outputting a rotating speed command signal for controlling a pump turbine in accordance with a power output command and outputting an excitation control signal to an AC excitation unit of the generator, and a second speed control unit for controlling, in a generation mode, an amount of AC excitation from an AC excitation unit when a rotating speed of a rotary shaft departs from a lower limit setting or an upper limit setting. The setting is set in accordance with the rotating speed generated during a normal operation.
    Type: Grant
    Filed: December 20, 1994
    Date of Patent: October 1, 1996
    Assignees: Hitachi, Ltd., The Kansai Electric Power Co., Inc.
    Inventors: Takao Kuwabara, Masataka Harada, Yasuteru Oono, Hiroto Nakagawa
  • Patent number: 5559704
    Abstract: A method for determining gross engine horsepower of an internal combustion engine coupled in driving relationship to an alternating current electric alternator, the alternator supplying electric power to variable loads, comprises measuring the field current and average per phase armature current supplied by the alternator; computing the magnitude of electric power supplied by the alternator from the measured values of field current and armature phase current; determining the engine efficiency at the computed magnitude of electric power; and converting the computed electric power to engine horsepower at the determined efficiency.
    Type: Grant
    Filed: December 7, 1994
    Date of Patent: September 24, 1996
    Assignee: General Electric Company
    Inventors: Laurence D. Vanek, Myron L. Smith, Ojekunle Aboyade
  • Patent number: 5545928
    Abstract: An electric power generation control method in a hybrid vehicle. A target generator output is calculated based on a state of charge, a catalyst temperature, etc., and the target number of engine revolutions is calculated based on the target generator output. A field current is corrected in response to the comparison result between a control target range determined in response to the target number of engine revolutions and the detected number of engine revolutions, thereby performing target control of the number of engine revolutions. Then, a correction amount of a throttle angle is set in response to the comparison result between a control target range determined in response to the target generator output and the detected generator output and the throttle angle is corrected, thereby performing target control of the generator output of a generator.
    Type: Grant
    Filed: September 8, 1994
    Date of Patent: August 13, 1996
    Assignee: Toyota Jidosha Kabushiki Kaisha
    Inventor: Takeshi Kotani
  • Patent number: 5429082
    Abstract: A method and arrangement for operating a drive for auxiliary devices arranged on an internal-combustion engine has a differential gear driven by the crankshaft of an internal-combustion engine distributes a driving torque corresponding to the tooth numbers of the transmission to auxiliary devices driven by this transmission. An exciting current which is supplied to an auxiliary device, as a function of load signals and/or cooling water temperature signals, is regulated so that it changes the driving torque of the generator. For maintaining a constant wiring voltage generated by the generator, the rotational speed of the generator therefore changes and, via the differential gear, the rotational speed changes of another auxiliary device. The cooling power of the internal-combustion engine can therefore be regulated as a function of cooling demands or load requirements.
    Type: Grant
    Filed: September 16, 1993
    Date of Patent: July 4, 1995
    Assignee: Dr. Ing. h.c.F. Porsche AG
    Inventor: Donatus Wichelhaus
  • Patent number: 5402007
    Abstract: In a vehicle having a voltage regulated electric alternator driven by an engine for supplying power to drive electrical loads and to charge a vehicle battery, a method of maintaining battery state-of-charge includes adaptively learning a system voltage set-point during a first mode of engine operation probabalistically resulting in an electrical system operative in set-point regulation. The method further determines from the adaptively learned system voltage set-point and a present system voltage during a second mode of engine operation that the electrical system is operative in auto-regulation. Idle speed is controlled in response to the regulation state of the electrical system to maintain the system in set-point regulation to ensure adequate battery charge or minimal battery discharge during the second mode of engine operation.
    Type: Grant
    Filed: November 4, 1993
    Date of Patent: March 28, 1995
    Assignee: General Motors Corporation
    Inventors: Marc B. Center, John A. Zahorchak, Alton G. De Claire, Jr.
  • Patent number: 5392741
    Abstract: A water cooling system for a locomotive engine that enables the engine to operate at a maximum power level that generates a maximum permissible engine cooling water temperature corresponding to a particular ambient air temperature. The water cooling system can be either an open-loop or a closed-loop controlled system. In the open-loop control system, an ambient air temperature sensor measures the ambient air temperature. When the ambient air temperature exceeds a predetermined value, a signal from the temperature sensor to a signal processor automatically causes the engine power to derate in accordance with the temperature such that the heat generated by the engine maintains the water temperature of the cooling water constant. An ambient pressure sensor senses ambient pressure such that a correction factor is supplied to correct for cooling losses at higher altitude.
    Type: Grant
    Filed: December 17, 1993
    Date of Patent: February 28, 1995
    Assignee: General Motors Corporation
    Inventor: Teoman Uzkan
  • Patent number: 5321308
    Abstract: A control method and apparatus for a gas turbine generator is disclosed having multiple modes of operation dependent on generator output components including real power generated, reactive power generated, and power factor. The apparatus provides for selecting a high priority output component, a low priority output component, and a variable output component. Depending on the priority selected, stator temperature is controlled with either a var limiter controller or a MW limiter controller. Rotor temperature is controlled by limiting excitation current substantially independently of priority selection. Setpoint selection may be variable and includes desired MW, MVAR's, and Power factor. This invention allows control of the generator to produce the maximum MVAR's the generator is capable of producing while at the same time utilizing the remainder of the gas turbine output capability for MW generation.
    Type: Grant
    Filed: July 14, 1993
    Date of Patent: June 14, 1994
    Assignee: Tri-Sen Systems Inc.
    Inventor: Allan W. Johncock
  • Patent number: 5311063
    Abstract: A vehicle engine speed controller for automatically determining the electrical load demand made of the engine electrical system from portable auxiliary and vehicle mounted electrically operated or controlled equipment, singly or in combination, and controlling the engine throttle speed setting through a governor with certain fail safe control mechanisms.
    Type: Grant
    Filed: May 7, 1993
    Date of Patent: May 10, 1994
    Assignee: Hubler Corporation
    Inventor: Scott M. Hubler
  • Patent number: 5298842
    Abstract: In a thermal overload protection system three system variables are sensed and provide the inputs required for a calculation conducted in real time at one second intervals. The system variables include ambient inlet air temperature to the alternator, alternator stator winding embedded sensor temperature, and traction motor armature current. A traction motor current limit is calculated using the inlet air temperature and the sensor temperature. The thermal overload is then controlled in response to the traction motor current.
    Type: Grant
    Filed: April 3, 1992
    Date of Patent: March 29, 1994
    Assignee: General Electric Company
    Inventors: Laurence D. Vanek, Robert G. McGrath
  • Patent number: 5293076
    Abstract: A control apparatus for a vehicle equipped with an engine senses a condition indicating the capacity of the battery of the vehicle. When the capacity is below a prescribed level, the drive current to an actuator of the vehicle is adjusted to prevent the battery from becoming excessively discharged. In one form of the invention, the drive current is decreased to decrease the load on the battery. In another form of the invention, the actuator is controlled to increase the engine speed, thereby increasing the output of a generator driven by the engine. In another form of the invention, the actuator is controlled to stop the engine. When the engine is restarted, the initial rotational speed of the engine is high enough for the generator to recharge the battery.
    Type: Grant
    Filed: April 14, 1992
    Date of Patent: March 8, 1994
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Wataru Fukui
  • Patent number: 5276353
    Abstract: A speed stabilization apparatus for use in a two shaft gas turbine is disclosed which includes a speed detector for detecting a rotational speed of a driving shaft of a turbine for driving a generator, a governer for controlling the amount of fuel supplied to a cumbustor, a plurality of delay circuits for providing load charging delay signals after predetermined time periods from when load charging commands are generated, and a forcible fuel supply control circuit. The governer usually controls the amount of fuel to the combustor in accordance with the detected speed signal from the detector so as to stabilize a rotational speed of the generator. When a load charging command is generated, the forcible fuel supply control circuit causes the governer controlling such that the full amount of fuel in supplied to the combustor. After the predetermined time duration from that, the corresponding charging load is connected to an output of the generator.
    Type: Grant
    Filed: August 24, 1992
    Date of Patent: January 4, 1994
    Assignee: Ebara Corporation
    Inventors: Toshimitsu Kobayashi, Koji Oda, Athusi Saigusa
  • Patent number: 5270575
    Abstract: A parameter representing a real generation amount is detected and the intake is increased based on the detected parameter instead of on-information of the switch of the electric load. Therefor, the rotation speed in idling is stabilized without excess idle-up. The controllability is excellent due to the combination with controlling the load of the alternator itself.
    Type: Grant
    Filed: August 19, 1992
    Date of Patent: December 14, 1993
    Assignee: Mitsubishi Jidosha Kogyo Kabushiki Kaisha
    Inventors: Kazuhide Togai, Tetsuro Ishida, Katsunori Ueda, Yoshiaki Danno, Yasuki Tamura, Katsuo Akishino, Toyoaki Fukui
  • Patent number: 5203170
    Abstract: A Stirling engine generating system comprises a Stirling engine driven by solar heat which is used as a heat input source for the engine, a generator driven by the Stirling engine, a temperature sensor detecting the temperature of an operational gas enclosed in an operational space of the engine, an operational gas tank communicated with the operational space via a pair of conduits, one way valves interposed in the corresponding conduits so as to invert the flow direction of the operational gas in each conduit, opening and closing valves each of which is interposed in the respective conduit between the one way valve and the operational gas tank, a field magnet control device for adjusting the rotational speed of the generator and a temperature regulation device for controlling the opening and closing action of the opening and closing valves to vary the operational gas pressure in the operational space in response to a detected signal of the temperature sensor and for controlling the field magnet control devic
    Type: Grant
    Filed: March 17, 1992
    Date of Patent: April 20, 1993
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventor: Yoshihiro Naito
  • Patent number: 5180923
    Abstract: Method and apparatus for detecting load rejection in a combustion turbine, wherein a speed signal representative of the turbine speed and a load signal representative of the turbine load are provided. The invention includes referencing devices for generating a delta speed reference signal and a delta load reference signal, derivative devices for determining the derivative of the speed signal and the load signal, comparators for comparing the speed derivative to the delta speed reference signal and for comparing the load derivative to the delta load reference signal and an indicator for indicating the occurrence of two events, namely, the first comparator determines that the speed derivative exceeds the delta speed reference signal and the second comparator determines that the load derivative exceeds the delta load reference signal. In one embodiment a maximum turbine speed reference signal is provided and a third comparator compares the speed signal to the maximum turbine speed reference signal.
    Type: Grant
    Filed: November 1, 1990
    Date of Patent: January 19, 1993
    Assignee: Westinghouse Electric Corp.
    Inventor: Paul J. Tyler
  • Patent number: 5170065
    Abstract: An engine speed control apparatus controls the rotational speed of an engine when the engine is overloaded.
    Type: Grant
    Filed: April 16, 1992
    Date of Patent: December 8, 1992
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Motohiro Shimizu, Kouichi Asai
  • Patent number: 5153446
    Abstract: A control apparatus of a rotational speed of an engine outputs a drive signal for adjusting the opening of a control valve which controls a specific volume of intake air of the engine to control the engine speed. The drive signal is based on the sum of a basic control amount and a correction amount. The correction amount is varied such that an actual speed of the engine and a target speed tend to become equal during the idling condition. When the engine goes to the idling condition from the loaded condition, the drive signal is added to a predetermined value to provide a much larger value of the drive signal than in the normal idling condition, and is then progressively decreased until the sum becomes equal to said first control amount. Thus, the engine can be operated without too large a drop in engine speed.
    Type: Grant
    Filed: November 22, 1991
    Date of Patent: October 6, 1992
    Assignee: Mitsubishi Denki K.K.
    Inventor: Setsuhiro Shimomura
  • Patent number: 5140960
    Abstract: An apparatus for controlling an engine idling rate comprises first correction means for correcting the engine idling rate according to the excitation period in each predetermined cranking period for driving a generator of the engine. A second correction means corrects the predetermined cranking period according to the engine idling rate, and suppresses variations of the engine idling rate.
    Type: Grant
    Filed: March 8, 1990
    Date of Patent: August 25, 1992
    Assignee: Mitsubishi Denki K. K.
    Inventors: Takanori Fujimoto, Hiroyasu Kisaichi
  • Patent number: 5095221
    Abstract: Method and apparatus for controlling fuel flow in a combustion turbine, wherein a speed reference signal is given and wherein an actual speed signal is given, is shown to include a fuel flow regulator for regulating the flow of fuel in response to a control signal, a controller for generating a control signal representative of the difference between the actual speed signal and the speed reference signal, a first adjustment member for modifying the speed reference signal to account for droop prior to generation of the control signal, and a second adjustment means for modifying the speed reference signal to account for speed error also prior to generating the control signal. A load condition specifically envisioned for use with the present invention is the point of closure of the generator breaker.
    Type: Grant
    Filed: November 3, 1989
    Date of Patent: March 10, 1992
    Assignee: Westinghouse Electric Corp.
    Inventor: Paul J. Tyler
  • Patent number: 5083038
    Abstract: In a vehicle vibration reduction control apparatus for controlling an alternator driven by an engine to charge a battery in such a way that vehicle body vibration due to the engine can be cancelled by alternator vibration, the reference voltage applied to an alternator field coil is reduced by a predetermined value for a predetermined time period, whenever battery terminal voltage exceeds a predetermined level. Since the battery charging rate can be reduced automatically at battery overcharge due to cancellation of engine vibration by alternator vibration, it is possible to prevent the battery from being overcharged when engine vibration increases at idling, for instance.
    Type: Grant
    Filed: January 17, 1991
    Date of Patent: January 21, 1992
    Assignee: Nissan Motor Company, Ltd.
    Inventors: Masao Fukushima, Kei Murakami, Shigeru Kuriyama, Yozo Nakamura, Yuji Maeda, Kenichi Nakamura, Keiichi Mashino, Yuzo Kadomukai
  • Patent number: 5057764
    Abstract: An idling engine speed controlling apparatus for an engine having a generator driven by an engine to charge a battery, a switching means for controlling the supply and interruption of an exciting current to a field winding for the generator so that a voltage generated from the generator or a voltage of a battery becomes a predetermined level, a continuous detecting means for detecting a total excitation time of the field winding during each rotational time period, and a regulator means having a control unit responsive to an output of continuous detecting means for adjusting a quantity of intake air supplied to the engine by detecting an excitation time of the field winding for each time period of the engine.
    Type: Grant
    Filed: September 14, 1989
    Date of Patent: October 15, 1991
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Takanori Fujimoto, Toshiro Hara
  • Patent number: 5028804
    Abstract: An energy conversion generation system receives energy from a resource and converts the energy into electrical power for supply to a polyphase electric power grid operating at a system frequency. A prime mover driven by the resource energy and a converter, such as a power electronic converter, for produces excitation power from power received from a converter power source. A brushless doubly-fed generator has a rotor with rotor windings and a stator with stator windings comprising first and second polyphase stator systems. The rotor is driven by the prime mover. The first stator system supplies the electrical power to the grid, and the second stator system receives the excitation power from the converter. A sensor senses a parameter of the electrical power output supplied to the grid and produces a sensor signal corresponding to the sensed parameter. A controller controls the converter in response to the sensor signal. The controller establiThis invention was made with government support under Grant No.
    Type: Grant
    Filed: June 30, 1989
    Date of Patent: July 2, 1991
    Assignee: The State of Oregon acting by and through the State Board of Higher Education on behalf of Oregon State University
    Inventor: Hian K. Lauw
  • Patent number: 4994684
    Abstract: Disclosed is a device and method to control the conversion of an arbitrary resource energy into mechanical energy and subsequently into electric energy with a variable-speed generation system utilizing a turbine and a doubly-fed generator, to be connected directly to a power grid of a certain grid frequency. Via electronic control of the rotor speed by controlling the rotor winding excitation frequency, the device has the capability of providing an optimum tradeoff in maximum turbine efficiency and minimal generator losses to secure maximum efficiency of the total conversion process, irrespective of varying resource and electric load conditions. The excitation requirements of the generator are confined to moderate levels and yet a wide rotor-speed variation margin, starting from zero speed, is permitted.
    Type: Grant
    Filed: January 30, 1989
    Date of Patent: February 19, 1991
    Assignee: The State of Oregon acting by and through the State Board of Higher Education on behalf of Oregon State University
    Inventors: Hian K. Lauw, Gerald C. Alexander
  • Patent number: 4989565
    Abstract: A rotational speed controller for an internal combustion engine of a vehicle has an air bypass passage which bypasses the throttle valve of the engine. A solenoid valve controls the air intake rate through the bypass passage. The output current of a generator which is driven by the engine is monitored by a current sensor. Based on the current which is sensed, an air intake adjuster calculates the change in the air intake rate through the bypass passage necessary to compensate for the load exerted on the engine by the generator so as to maintain a constant engine speed. The solenoid valve is controlled to change the air intake rate through the bypass passage by the amount calculated by the air intake adjuster. The change in the air intake rate can be calculated on the basis of the level of the generator current and/or the rate of change of the generator current.
    Type: Grant
    Filed: November 8, 1989
    Date of Patent: February 5, 1991
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Setsuhiro Shimomura, Akira Demizu, Hitoshi Inoue
  • Patent number: 4973896
    Abstract: An automobile generator apparatus for producing commercial line power when driven by an automobile engine comprises a generator, an inverter unit, a controller for controlling the generator field and an accelerator actuator.The accelerator actuator is mounted opposite the accelerator pedal in such manner as to prevent erroneous operation thereof.The generator field is controlled while monitoring both the low-voltage side output and the high-voltage side output so as to prevent a large output current from flowing through the low-voltage side load. A circuit is further provided for preventing the occurrence of an overvoltage as a result of field control transistor malfunction.The switching elements constituting the output stage of the inverter unit are controlled to vary the duty ratio of the output waveform so as to stabilize the inverter output voltage and controlled to remove the center portion of the output waves so as to cope with the startup load.
    Type: Grant
    Filed: October 21, 1988
    Date of Patent: November 27, 1990
    Assignee: Toyo Densan Company, Ltd.
    Inventors: Naomichi Shiga, Hisatoshi Tsuchiya, Yasuyuki Sakakibara, Katsumi Kibe
  • Patent number: 4926108
    Abstract: A motor-generator set for producing, within a predetermined range, a constant volts/hertz output from the generator. An engine drives an AC generator, the engine having an electronic speed regulator including a first potentiometer for adjusting a speed setting for the engine. The generator has a voltage regulator including a second potentiometer for setting the output voltage of the generator. The first and second potentiometers are ganged for simultaneous adjustment whereby adjusting the potentiometers in one direction increases the speed of the engine and the output frequency and voltage of the generator while adjusting the potentiometers in the other direction decreases the speed of the engine and the output frequency and voltage of the generator.
    Type: Grant
    Filed: January 19, 1988
    Date of Patent: May 15, 1990
    Inventors: Arthur F. Schooley, Wolf R. Eben-Ebenau, Lloyd J. Nelson
  • Patent number: 4920277
    Abstract: A variable speed hydro-power plant includes a pump turbine (2) having a S-shaped characteristics at the turbine operation. A current time turbine operating point is grasped on a turbine characteristics diagram of the pump turbine (2). A limit operation characteristics curve (nr) of the pump turbine (2) is formed in advance so as to not reach the S-shaped characteristics turbine operation region. A reach of the limit operation characteristics curve (nr) is detected, a rotating speed (N) of the pump turbine (2) is lowered. An inrush of the pump turbine (2) into the S-shaped characteristics turbine operation region is eliminated, so the continuation of a stable and reliable turbine operation can be guaranteed.
    Type: Grant
    Filed: August 10, 1988
    Date of Patent: April 24, 1990
    Assignees: Hitachi, Ltd., Kansai Electric Power Co., Inc.
    Inventors: Takao Kuwabara, Hiroto Nakagawa, Eizo Kita
  • Patent number: 4877273
    Abstract: An operation control system for an internal combustion engine includes a first current detector for detecting a value of electric current flowing in a field winding of an AC generator of the engine, and an ECU responsive to the detected value of electric current for determining a control amount by which the operation of the engine is to be controlled, and for changing output torque of the engine in response to the determined control amount. A second current detector, preferably, a Hall element, detects a value of electric current flowing from the AC generator to electrical loads on the engine. The ECU detects a transient state of the electrical loads, based upon the detected value of electric current from the second current detector. The ECU is operable when the transient state is detected, for determining a transient correction amount of the determined control amount, in response to the detected value of electric current from the first current detector.
    Type: Grant
    Filed: September 7, 1988
    Date of Patent: October 31, 1989
    Assignee: Honda Giken Kogyo K.K.
    Inventors: Yoshio Wazaki, Keisuke Kudo
  • Patent number: 4864151
    Abstract: An exhaust gas turbine powered electric generating system for supplying electrical loads on a motor vehicle. The inlet of the gas turbine is supplied with the exhaust gas of an internal combustion engine. The effective turbine inlet area is controlled by a valve which is adjusted as a function of the output current of the generator. As generator output current increases the valve is adjusted to decrease turbine inlet area thereby increasing engine back pressure which tends to slow the engine down. An idle speed control is provided which in response to engine slow-down increases the amount of air and fuel supplied to the engine to thereby increase the exhaust gas mass flow supplied to the turbine.
    Type: Grant
    Filed: May 31, 1988
    Date of Patent: September 5, 1989
    Assignee: General Motors Corporation
    Inventors: Floyd A. Wyczalek, Stanley H. Mick
  • Patent number: 4853553
    Abstract: A diesel-electric propulsion and operating system may be used alone or in combination with another power supply. It has particular application to a dual mode, trolley and diesel bus. The diesel engine is controlled to supply only that power demanded by the electrical systems, including the traction motor, and to operate on a fixed power curve. This provides an optimized efficiency. Other novel characteristics include a two-speed drive axle limited to the mode selector, a backup hydraulic motor and pump, a dual mode passenger compartment tester, and a diesel engine pretester.
    Type: Grant
    Filed: October 30, 1987
    Date of Patent: August 1, 1989
    Inventor: Alan P. Hosie
  • Patent number: 4853552
    Abstract: A signal representing the electrical output power of a steam turbine-generator is fed back to a control system. A signal representing the boiler steam pressure is also fed to the control system. A control signal for controlling valves feeding steam to the steam turbine is gain controlled between one and zero in the presence of a negative rate of change of steam pressure less than a predetermined value. At other negative and all positive values of rate of change of steam pressure, the control signal is unaffected. In one embodiment, a linear relationship is employed for controlling the gain for increasingly negative values of the rate of change of steam pressure. At an extreme negative value, the gain is controlled to zero, whereby the a load reference signal remains unchanged.
    Type: Grant
    Filed: March 30, 1988
    Date of Patent: August 1, 1989
    Assignee: General Electric Company
    Inventors: Jens Kure-Jensen, Bernd A. K. Westphal, Thane M. Drummond
  • Patent number: 4833887
    Abstract: Intake and exhaust ports of an internal combustion engine possess respective turbine impellers, and an electrical rotary machine is formed on a rotary shaft connecting the impellers. Sensors are provided for sensing the loaded state of the engine at all times based on engine rpm and the amount of fuel supplied to the engine. When the engine is overloaded, the electrical rotary machine is made to operate as a motor to assist in the supercharging of the engine. When the engine load is not excessive, the rotary machine is made to operate as a generator to charge surplus energy, derived from the engine exhaust, in a storage battery.
    Type: Grant
    Filed: August 28, 1986
    Date of Patent: May 30, 1989
    Assignees: Isuzu Motors Limited, Hitachi, Ltd.
    Inventors: Hideo Kawamura, Katsuyuki Tamai, Shigeki Saito, Toshihiro Yamanaka
  • Patent number: 4823018
    Abstract: A control system for a variable speed water turbine generator apparatus includes a first function generator that is responsive to an output command signal. The first function generator produces a rotation number command signal. A speed adjuster produces an output signal in accordance with a different signal between the first function generator output and an actual rotation number. An adder adds the generator output command signal to the speed adjuster output signal to determine an overall output command signal. An output aduster produces an output signal in accordance with a difference between the adder output and an actual power output of the generator for controlling the firing angles of the frequency converter. A second function generator, responsive to the generator output command signal, determines an opening command signal for the variable opening vanes.
    Type: Grant
    Filed: May 7, 1987
    Date of Patent: April 18, 1989
    Assignee: Hitachi Ltd.
    Inventors: Takao Kuwabara, Akira Bando, Eiji Haraguchi, Hiroto Nakagawa
  • Patent number: 4791309
    Abstract: A hydroelectric power system has a reservoir (prime mover) (17) driving an electrical generator (10) which supplies a consumer load (B) and an auxiliary load (14). A control system (11) operates control (15) for the prime mover, control (13) for the auxiliary load and/or control (12) for the consumer load in response to a signal from the generator (10) or some other source, so that the supply is stabilized so far as possible to a minimum. Normally no energy is dissipated in the auxiliary load, except during a control sequence.
    Type: Grant
    Filed: December 28, 1987
    Date of Patent: December 13, 1988
    Assignee: Thamesmead Engineering Limited
    Inventors: Richard D. Payne, Eric E. Simpson
  • Patent number: 4764838
    Abstract: A permanent magnet generator and rectifier is connected to the exciter of an alternator and a separate rectifier provides a D.C. voltage supply to a voltage regulator. A thyristor is connected in series with a second fuse across the exciter rectifier to short circuit the supply in series with a main external fuse. If the main fuse fails to open, the second fuse opens. The second fuse is potted in the regulators to prevent tampering. An overexcitation and a low voltage demand signal are sensed. The two signals are coupled to a NAND logic gate to produce an output shut-down signal. If either even is established and the first produces a signal, a shut-down signal is generated to a second comparator amplifier of latch circuit. A delay circuit connects the shut-down signal to a triggered oscillator for firing the thyristor.
    Type: Grant
    Filed: August 15, 1986
    Date of Patent: August 16, 1988
    Assignee: Marathon Electric Manufacturing Corp.
    Inventor: Alistair A. MacFarlane
  • Patent number: 4757686
    Abstract: A motor/generator is mounted on the turbine shaft of a supercharger in an internal combustion engine. Whether the motor/generator should operate as a motor or a generator is determined by a signal from a flow rate sensor that detect the rate of fuel flow and a signal from a rotation sensor that detects rotation of the internal combustion engine. When the motor/generator operates as a generator, the fuel flow rate is controlled in response to an output signal indicative of electric power from the generator. When the motor/generator operates as a motor, electric power supplied thereto is controlled in response to an accumulated value of supplied electric power.
    Type: Grant
    Filed: August 29, 1986
    Date of Patent: July 19, 1988
    Assignees: Isuzu Motors Limited, Hitachi, Ltd.
    Inventors: Hideo Kawamura, Katsuyuki Tamai, Shigeki Saito, Toshihiro Yamanaka
  • Patent number: 4754156
    Abstract: Disclosed is a control apparatus for a variable-speed hydraulic power generating system comprising a variable-speed a.c. electric generator connected to an a.c. electric power system and a hydraulic machine system including a water turbine for driving the generator and a guide vane for controlling an amount of water supplied to the water turbine.
    Type: Grant
    Filed: October 16, 1987
    Date of Patent: June 28, 1988
    Assignees: Hitachi, Ltd., The Kansai Electric Power Co., Inc.
    Inventors: Junichi Shiozaki, Akira Bando, Takao Kuwabara, Eiji Haraguchi, Hiroto Nakagawa
  • Patent number: 4746807
    Abstract: An automatic control system for a power plant including a torque such as a steam turbine and a generator for converting the generated torque into electrical output.
    Type: Grant
    Filed: January 28, 1987
    Date of Patent: May 24, 1988
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventors: Isao Furo, Suketsugu Kabayama
  • Patent number: 4730118
    Abstract: An induction generator system is disclosed for utilization with an oil producing well having casing gas available at the wellhead and an existing electrical power system. An electric motor is coupled to the existing electrical power system and is utilized as a generator to drive a submersible pump or other electrical load. A gas engine which is powered by the casing gas is mechanically coupled to the electric motor by means of a drive belt and is utilized to drive the electric motor at a speed greater than the synchronous speed of the motor. While the electric motor is driven at a speed greater than its synchronous speed it will generate electrical energy which can be utilized to carry the electrical load. A novel control system is utilized to control the operation of the engine/motor generator system in response to variations in motor speeds, engine operating parameters and load/voltage conditions.
    Type: Grant
    Filed: August 11, 1987
    Date of Patent: March 8, 1988
    Assignee: James D. Barnes
    Inventors: Malcolm H. Quarles, William D. Bolin
  • Patent number: 4695221
    Abstract: A turbine shutdown control system for controlling a turbine powering two load groups. Upon loss of one load group, a first control valve will close to interrupt the fluid flow to the turbine. A second modulating valve in parallel with the first valve remains open to provide sufficient fluid flow to the turbine to power the second load group.
    Type: Grant
    Filed: December 4, 1985
    Date of Patent: September 22, 1987
    Assignee: Rotoflow Corporation
    Inventor: Judson S. Swearingen
  • Patent number: 4694189
    Abstract: A control system for variable speed hydraulic turbine generator apparatus comprises an induction generator connected at its primary side to an AC power line system, a secondary excitation controller connected to the secondary side of the induction generator and being responsive to a generator output command signal supplied externally to supply to the induction generator an excitation current which causes the induction generator to generate AC power at the same frequency as that on the AC power line system, a hydraulic turbine for rotating the induction generator, a guide valve for regulating the amount of water supplied to the hydraulic turbine, a rotation speed detector for detecting a rotation speed of the induction generator, a rotation speed command calculator for receiving a hydraulic turbine running condition signal inclusive of the external generator output command signal and calculating an optimum rotation speed command, a rotation speed controller for comparing the optimum rotation speed command with
    Type: Grant
    Filed: September 24, 1986
    Date of Patent: September 15, 1987
    Assignees: Hitachi, Ltd., The Kansai Electric Power Co., Inc.
    Inventors: Eiji Haraguchi, Hiroto Nakagawa, Akira Bando, Takao Kuwahara, Haruo Nohara, Kenichi Ono
  • Patent number: 4694188
    Abstract: The integral part of a power controller and of a PI speed controller is formed by a common integrator, both controllers always being engaged. With this linear interlinking of the two controllers, stability can be assured in the two limit cases of the network (rigid network and ohmic island) as well as practically in all cases in between.
    Type: Grant
    Filed: August 8, 1986
    Date of Patent: September 15, 1987
    Assignee: Siemens Aktiengesellschaft
    Inventors: Dieter Diegel, Gerhard Plohn, Manfred Schuh, deceased
  • Patent number: 4682044
    Abstract: An automobile engine having a device for increasing the inkage air in idle operation when a load is applied to the engine from equipments associate with the engine. An alternator driven by the engine has a voltage regulator which controls the alternator output in response to a load condition on the alternator by controlling the field current. A control unit is provided to restrict an increase in the field current when an electric load is turned on for a time period required for having the engine output increased.
    Type: Grant
    Filed: October 25, 1985
    Date of Patent: July 21, 1987
    Assignee: Mazda Motor Corporation
    Inventors: Makoto Hotate, Tadashi Kaneko, Toshio Nishikawa, Tadataka Nakazumi, Nobuo Takeuchi
  • Patent number: 4668872
    Abstract: The inventive control system introduces the current (.DELTA.I) and voltage (.DELTA.C) deviations simultaneously with the injection set point (C) to define a new injection set point (C') that is utilized in conjunction with the measurement of diesel engine speed (V.sub.rD) to adjust the injection and with the measurement of the injection flow rate C.sub.r to adjust the generator excitation current.
    Type: Grant
    Filed: December 11, 1985
    Date of Patent: May 26, 1987
    Assignee: Alsthom and Neyrpic
    Inventors: Bernard Lerouge, Luc Jourdan
  • Patent number: 4653276
    Abstract: An automatic control system for a thermal power plant comprises a master controller controlling a turbine in response to an externally applied load command signal, and producing a boiler input command signal by correcting the load command signal on the basis of the detected pressure of main steam generated from a boiler, and a water/steam process controller, a fuel process controller, a combustion process controller and a draft process controller to all of which the boiler input command signal is applied from the master controller. The process controllers apply control signals to equipments controlling a water/steam process, a fuel process, a combustion process and a draft process respectively among the terminal actuating equipments of the various parts of the boiler.
    Type: Grant
    Filed: March 7, 1986
    Date of Patent: March 31, 1987
    Assignees: Hitachi, Ltd., Hitachi Engineering Co., Ltd.
    Inventors: Akira Sugano, Sachio Yamanobe
  • Patent number: 4634887
    Abstract: The propulsion control system of a diesel-electric locomotive includes means responsive to the rotational speed and the gross horsepower of a locomotive engine for controlling the rate at which traction load is added to the engine, when more load is called for, so that the loading rate will increase (between predetermined minimum and maximum limits) as the product of speed and horsepower increases. The loading rate is also increased in response to the ratio of combustion air to diesel fuel increasing above a predetermined no-smoke threshold.
    Type: Grant
    Filed: June 24, 1985
    Date of Patent: January 6, 1987
    Assignee: General Electric Company
    Inventors: Edgar T. Balch, Richard E. Bilski, Ajith K. Kumar
  • Patent number: 4633093
    Abstract: An idling speed feedback control method for use with an internal combustion engine having electrical load equipment and a generator for supplying electric power to the electrical load equipment, the generator being driving by the engine. The idling speed feedback control amount is effected as a function of the difference between an actual engine speed and a target idling speed. The method comprises the steps of detecting a generating state signal as a function of the field coil current of the generator which represents the generating state of the generator; detecting the actual engine speed; determining an electrical load correction value during a time period starting at or before the time when the electrical load correction value changes and ending at the time at or after the electrical load correction value changes.
    Type: Grant
    Filed: January 17, 1985
    Date of Patent: December 30, 1986
    Assignee: Honda Giken Kogyo Kabushiki Kaisha
    Inventors: Yutaka Otobe, Takahiro Iwata
  • Patent number: 4561254
    Abstract: In a combined steam generator-turbine system, a drain type is provided in front of the stop valve to drain the first steam supply with the stop valve closed until the temperature of the valve and/or the temperature of the steam exceeds the temperature of saturation by a predetermined amount, and logic circuitry is provided to generate permissive signals which combine to allow successive admission of steam to the gland seal and to the steam turbine.
    Type: Grant
    Filed: October 25, 1984
    Date of Patent: December 31, 1985
    Assignee: Westinghouse Electric Corp.
    Inventors: Alan Martens, Milton M. Hobbs, Gerald A. Myers
  • Patent number: 4551796
    Abstract: A system for regulating the liquid level (20) in a vapor generator (10), in which the incoming flow of feed liquid (54) is regulated (48) in response to the difference between the measured liquid level (76) and a reference level (80), the difference between the exiting vapor mass flow rate (64) and the incoming liquid mass flow rate (56), and a function of the measured incoming liquid temperature (92). The temperature function produces a gain value (98), which increases in response to decreasing incoming liquid temperature.
    Type: Grant
    Filed: June 3, 1983
    Date of Patent: November 5, 1985
    Assignee: Combustion Engineering, Inc.
    Inventor: Gurdip Singh
  • Patent number: 4547678
    Abstract: Disclosed herein are vehicle control devices and methods including a signal processor responsive to a signal proportional to dynamo speed and a second signal proportional to desired torque. The signal processor provides a control signal for suitable armature voltage control means which controls the armature voltage so as to adjust dynamo torque with respect to the desired torque signal. The signal processor further in response to the dynamo speed signal and in response to a signal proportional to brake pedal position provides a control signal to chopper means for adjusting the power generated by the dynamos in response to the brake pedal position. The signal processor further controls the dynamo field with respect to dynamo torque and speed so as to maximize dynamo operating efficiency. Various related devices and methods are also disclosed.
    Type: Grant
    Filed: February 15, 1984
    Date of Patent: October 15, 1985
    Assignee: Califone International, Inc.
    Inventors: Robert G. Metzner, Stephen H. Smith