External Condition Sensor Patents (Class 62/211)
  • Patent number: 10809707
    Abstract: An HVAC&R monitor detects short-term and long-term system efficiency degradations by modeling either compressor input power or current. The model is continuously updated with new or recent temperature and power parameter measurements reflecting the most up-to-date operating condition of the system. Short-term system degradations are detected instantaneously by comparing compressor power or current as predicted by the model against measured power or current usage. Long-term system degradations are detected over time by monitoring the sensitivity of the compressor power or current usage to evaporator and/or condenser fluid temperatures. An appropriate warning and/or signal may be issued if system efficiency degradation is detected.
    Type: Grant
    Filed: February 22, 2018
    Date of Patent: October 20, 2020
    Assignee: Schneider Electric USA, Inc.
    Inventors: Paul R. Buda, Ian J. Lyttle
  • Patent number: 10782057
    Abstract: A method of cooling a motor coupled to a compressor of a chiller includes adjusting a position of a motor cooling valve located fluidly between the motor and a refrigerant source, using a motor temperature control system coupled to the motor cooling valve to regulate an amount of refrigerant introduced into the motor from the condenser according to a temperature control scheme performed as a function of a monitored temperature in the motor, a first temperature threshold, and a second temperature threshold lower than the first temperature threshold. The temperature control scheme includes a motor cooling control process that adjusts the position of the motor cooling valve based on a stator winding temperature set point relating to stator windings of the motor. A proportionally limited close command override associated with a first temperature range above the second temperature threshold proportionally limits a close command provided to the motor cooling valve.
    Type: Grant
    Filed: December 27, 2018
    Date of Patent: September 22, 2020
    Assignee: Johnson Controls Technology Company
    Inventor: Curtis Christian Crane
  • Patent number: 10760842
    Abstract: A method and system for improving energy efficiency of a refrigeration system include system components such as a condenser, one or more expansion valves, an evaporator, one or more compressors, and a system controller electrically coupled to the one or more of the system components, according to one embodiment. The system controller is configured to selectively actuate, directly or indirectly, the one or more expansion valves, the condenser, and/or the one or more compressors, at least partially based on temperatures and/or pressures of the system fluid at various points of the system, to control a temperature of a refrigerated area.
    Type: Grant
    Filed: November 29, 2017
    Date of Patent: September 1, 2020
    Assignee: DC Engineering, Inc.
    Inventors: Thomas Dean Wolgamot, Timothy Alan Gwyn, William Michael Crist
  • Patent number: 10502461
    Abstract: A CO2 refrigeration system includes a CO2 refrigeration subsystem that provides cooling for a refrigeration load using carbon dioxide (CO2) as a refrigerant. The CO2 refrigeration system further includes a direct CO2 heat exchange subsystem that uses the CO2 refrigerant from the CO2 refrigeration subsystem to provide heating or cooling for a building zone. The direct CO2 heat exchange subsystem includes a heat exchanger that exchanges heat directly between the CO2 refrigerant and an airflow provided to the building zone.
    Type: Grant
    Filed: July 27, 2016
    Date of Patent: December 10, 2019
    Assignee: Hill Phoeniz, Inc.
    Inventors: Kim Christensen, Paul Hallett, Tony Mills
  • Patent number: 10480838
    Abstract: A refrigeration cycle apparatus controller includes an expansion-valve controller configured to output an opening-degree command for an expansion valve based on a deviation between a discharge temperature of refrigerant discharged from a compressor and a set discharge temperature, and at least two control parameters including a proportionality coefficient and an integral coefficient, a flow-rate-correction-coefficient calculator configured to calculate a flow-rate correction coefficient from a refrigerant flow rate of refrigerant circulating through a refrigerant circuit and a preset flow-rate reference value, and a coefficient corrector configured to calculate the proportionality coefficient by correcting a preset proportionality-coefficient reference value based on the flow-rate correction coefficient, and calculate the integral coefficient by correcting a preset integral-coefficient reference value based on the flow-rate correction coefficient.
    Type: Grant
    Filed: March 2, 2015
    Date of Patent: November 19, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventors: Masashi Fujitsuka, Masaya Kimura, Kazunori Tsuchino
  • Patent number: 10480835
    Abstract: Provided are a gas-replenishing and enthalpy-increasing control method, device and apparatus for a two-stage compressor. The method includes: when a gas-replenishing electronic expansion valve needs to be opened, gradually increasing, by a controller, an opening degree of the gas-replenishing electronic expansion valve in a time sequence; after the gas-replenishing electronic expansion valve is opened, acquiring a detected gas-replenishing superheat degree of a two-stage compressor; and adjusting, based on the gas-replenishing superheat degree of the two-stage compressor, the opening degree of the gas-replenishing electronic expansion valve, wherein the gas-replenishing electronic expansion valve is disposed between a medium-pressure liquid storage tank and the two-stage compressor, and when the opening degree of the gas-replenishing electronic expansion valve is not zero, a gaseous refrigerant in the medium-pressure liquid storage tank replenishes gas and increases enthalpy for the two-stage compressor.
    Type: Grant
    Filed: May 5, 2016
    Date of Patent: November 19, 2019
    Assignee: GREE ELECTRIC APPLIANCES, INC. OF ZHUHAI
    Inventors: Huan Zhao, Jun Shen, Feng Tan, Youxuan Liang, Pengfei Li
  • Patent number: 10401060
    Abstract: In an air conditioning apparatus, an expansion valve is determined to be in a fully closed state when a refrigerant temperature in an outlet of an indoor heat exchanger and a refrigerant temperature in an inlet or an intermediate part of the indoor heat exchanger satisfy a closed-valve condition. The temperature in the outlet is detected by a gas-side temperature sensor. The temperature in the inlet or the intermediate part is detected by a liquid-side temperature sensor. The closed-valve condition is in relation to a refrigerant evaporation temperature obtained by converting a refrigerant pressure in an intake side of a compressor to a refrigerant saturation temperature, and in relation to an air temperature of an air-conditioned space cooled by the indoor heat exchanger. The pressure in the intake side is detected by an intake pressure sensor. The air temperature is detected by an indoor temperature sensor.
    Type: Grant
    Filed: December 8, 2015
    Date of Patent: September 3, 2019
    Assignee: Daikin Industries, Ltd.
    Inventors: Yoshiyuki Tsuji, Yasushi Hori, Mariko Takakura
  • Patent number: 10222082
    Abstract: An air conditioner has a control-data storage unit to store therein control data, a buffer unit to store therein update data of the control data, a rewriting unit, a data reception unit, and a reception processing unit. The rewriting unit executes a rewriting process of rewriting the control data stored in the control-data storage unit with the update data stored in the buffer unit. The data reception unit receives, through a wireless communication, the update data that is transmitted multiple times from a transmitter. The reception processing unit determines whether the rewriting process is in progress at a time when the update data is received, discards the received update data if the rewriting process is in progress, and stores the received update data in the buffer unit if the rewriting process is not in progress.
    Type: Grant
    Filed: December 12, 2014
    Date of Patent: March 5, 2019
    Assignee: Mitsubishi Electric Corporation
    Inventor: Mitsugu Shiratori
  • Patent number: 9989288
    Abstract: The present invention provides a control system for managing lubricant levels in tandem compressor assemblies of a heating, ventilation, and air conditioning (HVAC) system. In transitioning from a partial load that operates a first compressor but not a second compressor of a tandem assembly to a full load that operates both the first and the second compressor, a controller of the HVAC system turns OFF both compressors of the tandem compressor assembly to allow time for lubricant levels to equalize between the first and the second compressor.
    Type: Grant
    Filed: November 4, 2016
    Date of Patent: June 5, 2018
    Assignee: Lennox Industries Inc.
    Inventors: Aylan Him, Der-Kai Hung, David Mackey, Lin Hong
  • Patent number: 9983070
    Abstract: Systems and methods are disclosed that include providing a heating, ventilation, and/or air conditioning (HVAC) system with a temperature sensor validation system that measures the ambient outdoor temperature using a first temperature sensor and the refrigeration coil temperature using a second temperature sensor at a plurality of time intervals following a refrigeration coil defrost procedure. A system controller may implement an algorithm to determine if the first temperature sensor and the second temperature sensor are reliable by comparing the temperature readings from the first temperature sensor and the second temperature sensor taken at the plurality of time intervals following the defrost procedure. The system controller may also implement so-called limp along modes if any temperature sensor is determined unreliable.
    Type: Grant
    Filed: January 8, 2016
    Date of Patent: May 29, 2018
    Assignee: Trane International Inc.
    Inventor: Darryl Elliott Denton
  • Patent number: 9885489
    Abstract: A system includes a heat pump configured to match a working heat transfer fluid temperature to a fluid temperature set-point, a fluid pump in fluid communication with the heat pump through the heat transfer fluid and configured to match the heat transfer fluid pressure/flow to a fluid pressure/flow set-point, at least one heat exchanger in fluid communication with the fluid pump, and a supervisory controller in signal communication with the at least one heat exchanger, the fluid pump, and the heat pump. The at least one heat exchanger includes a proportional valve and a return air temperature gauge configured to monitor return air temperature associated therewith. The supervisory controller is configured to vary the fluid temperature set-point and vary the fluid pressure/flow set-point based upon a position of the proportional valve and the return air temperature.
    Type: Grant
    Filed: July 26, 2012
    Date of Patent: February 6, 2018
    Assignee: CARRIER CORPORATION
    Inventors: Junqiang Fan, Stevo Mijanovic, Lishan Wang
  • Patent number: 9771933
    Abstract: Systems and methods of the invention relate to diagnosing a compressor. A method may include monitoring a pressure of compressed air within a reservoir of a compressor, actuating an unloader valve of the compressor, and detecting a leak condition of the compressor through recognition of a change in the monitored pressure of the compressed air within the reservoir during a time period in which the unloader valve is actuated. A system is also disclosed including an engine, a compressor operatively connected to the engine, and a controller that is operable to determine a condition of the compressor.
    Type: Grant
    Filed: April 19, 2013
    Date of Patent: September 26, 2017
    Assignee: General Electric Company
    Inventors: Bret Dwayne Worden, Richard C. Peoples, David E. Peterson, Jason M. Strode, Neil W. Burkell, Milan Karunaratne
  • Patent number: 9644872
    Abstract: The refrigerant discharged from a compressor is distributed based on the priorities set by the user in advance and the remaining refrigerant is further distributed based on the priorities. Thus, setting the priorities for indoor units according, for example, to the usage of work spaces and the like in an office building, the user can operate a heat pump system efficiently in accordance with the intended use. Furthermore, the remaining capacity of the outdoor unit is distribute to the remaining indoor units according to their priorities so that the indoor units are operated efficiently within the range of the cooling capacity of the outdoor unit.
    Type: Grant
    Filed: October 24, 2011
    Date of Patent: May 9, 2017
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Kosuke Tanaka, Hirofumi Koge, Tomokazu Kawagoe
  • Patent number: 9235219
    Abstract: A system for controlling the flow of a fluid from a source to a load includes a source. An on/off type of control valve communicates with the source. A micro-electric mechanical system communicates with the on/off type of control valve. A consuming device communicates with the micro-electric mechanical system. An electronic controller that communicates with the consuming device and the source. The electronic controller measures a change in a parameter of the micro-electric mechanical system that results from the flow of fluid through the micro-electric mechanical system to sense a flow of fluid through a micro-electric mechanical system.
    Type: Grant
    Filed: December 19, 2013
    Date of Patent: January 12, 2016
    Assignee: Zhejiang Dunan Hetian Metal Co., Ltd.
    Inventors: Parthiban Arunasalam, Arvind Rao
  • Patent number: 9010133
    Abstract: An appliance includes an appliance housing, an interface adapted to receive power information, a plurality of sensors for sensing environmental conditions, a plurality of controls for controlling operations of the appliance, and an intelligent control. The intelligent control is disposed within the appliance housing and operatively connected to the interface and the plurality of sensors and adapted to dynamically select control values associated with the plurality of controls based on at least one of the power information, the environmental conditions, or a combination thereof to increase energy efficiency of the appliance.
    Type: Grant
    Filed: June 20, 2012
    Date of Patent: April 21, 2015
    Assignee: Whirlpool Corporation
    Inventors: Farhad Ashrafzadeh, Ali R. Buendia-Garcia, Alberto Regio Gomes, Tushar Kulkarni, Andrew D. Litch, Peter J. Richmond
  • Publication number: 20150059373
    Abstract: A refrigeration vapor compression system including a compressor, an electronic expansion valve with closed loop feedback into a controller, sensors to measure and monitor the system superheat and sub-cooling, and condenser fans controlling the flow of air through the condensing coils, the refrigeration system is operated in at least one of two functional modes to either give priority control to the level of superheat in the system or maintain a minimum level of sub-cooling in the system.
    Type: Application
    Filed: August 29, 2014
    Publication date: March 5, 2015
    Applicant: BECKETT PERFORMANCE PRODUCTS, LLC
    Inventors: Dennis R. Maiello, Michael John Dimunation
  • Patent number: 8900041
    Abstract: A fan includes a hub, several fan blades, and a motor that is operable to drive the hub. A motor controller is in communication with the motor, and is configured to select the rate of rotation at which the motor drives the hub. The fan is installed in a place having a floor and a ceiling. An upper temperature sensor is positioned near the ceiling. A lower temperature sensor is positioned near the floor. The temperature sensors communicate with the motor controller, which includes a processor configured to compare substantially contemporaneous temperature readings from the upper and lower temperature sensors. The motor controller is thus configured to automatically control the fan motor to minimize the differences between substantially contemporaneous temperature readings from the upper and lower temperature sensors. The fan system may thus substantially destratify air in an environment, to provide a substantially uniform temperature distribution within the environment.
    Type: Grant
    Filed: July 28, 2010
    Date of Patent: December 2, 2014
    Assignee: Delta T Corporation
    Inventor: Mark A. Toy
  • Publication number: 20110023513
    Abstract: A refrigerant expansion valve for a refrigerant system includes a main body, a motor and first and second members. The main body has a refrigerant flow passage that extends therethrough. The first and second members are connected together and are configured with threads that have a different pitch to allow for relative movement between both members and the main body. The motor is positioned adjacent the main body and is coupled to the first member. The motor actuates the first member in response to control signals to move the second member within the main body to modulate the flow of refrigerant through the refrigerant flow passage.
    Type: Application
    Filed: July 28, 2009
    Publication date: February 3, 2011
    Applicant: HAMILTON SUNDSTRAND CORPORATION
    Inventors: Paul E. Hamel, Jason Labrie
  • Patent number: 7505870
    Abstract: Thermal subsystems of manufactured information handling systems are tested for compliance with desired parameters by running a thermal diagnostics module in firmware during one or more manufacturing activities performed on the information handling system. The thermal diagnostics module monitors and stores one or more thermal parameters detected at the information handling system, such as the maximum temperature zone detected during a manufacturing activity. The stored thermal parameter is read after the manufacturing activity and compared with an expected value to determine the status of the thermal subsystem. For instance, an information handling system maximum operating temperature is detected by firmware running on an embedded controller during imaging of a hard disk drive and fails thermal testing if the detected maximum operating temperature exceeds a predetermined value, such as a value that would not be reached if the thermal subsystem functioning properly.
    Type: Grant
    Filed: August 17, 2007
    Date of Patent: March 17, 2009
    Assignee: Dell Products L.P.
    Inventors: Drew Schulke, Barry Kahr, Vinod Makhija, Adolfo Montero, Hasnain Shabbir
  • Patent number: 7389648
    Abstract: A refrigerant cycle is provided with a control for an expansion device to achieve a desired compressor discharge pressure. The system operates transcritically, such that greater freedom over compressor discharge pressure is provided. The system's efficiency is optimized by selecting an optimum discharge pressure. The optimum discharge pressure is selected based upon sensed environmental conditions, and the expansion device is adjusted to achieve the desired compressor discharge pressure. A feedback loop may be provided to sense the actual compressor discharge pressure and adjust the actual compressor discharge pressure by further refining the expansion device. The system is disclosed providing heated water based upon a demand for a particular hot water temperature.
    Type: Grant
    Filed: March 4, 2004
    Date of Patent: June 24, 2008
    Assignee: Carrier Corporation
    Inventors: Julio Concha, Tobias H. Sienel, Bryan A. Eisenhower, Yu Chen, Young K. Park
  • Patent number: 7275019
    Abstract: Thermal subsystems of manufactured information handling systems are tested for compliance with desired parameters by running a thermal diagnostics module in firmware during one or more manufacturing activities performed on the information handling system. The thermal diagnostics module monitors and stores one or more thermal parameters detected at the information handling system, such as the maximum temperature zone detected during a manufacturing activity. The stored thermal parameter is read after the manufacturing activity and compared with an expected value to determine the status of the thermal subsystem. For instance, an information handling system maximum operating temperature is detected by firmware running on an embedded controller during imaging of a hard disk drive and fails thermal testing if the detected maximum operating temperature exceeds a predetermined value, such as a value that would not be reached if the thermal subsystem functioning properly.
    Type: Grant
    Filed: May 17, 2005
    Date of Patent: September 25, 2007
    Assignee: Dell Products L.P.
    Inventors: Drew Schulke, Barry Kahr, Vinod Makhija, Adolfo Montero, Hasnain Shabbir
  • Patent number: 7143590
    Abstract: In a vehicle air conditioner, at least one of an inner surface temperature of a passenger compartment and a surface temperature of a passenger in each detection area is the passenger compartment is detected by an infrared rays sensor, and a control unit determines a solar radiation condition such as a solar radiation amount and a solar radiation direction in the passenger compartment based on the surface temperature detected by the infrared rays sensor. The control unit controls operation of an operation member such as an air mixing door, based on the determined solar radiation condition. Thus, uncomfortable feeling given to the passenger can be reduced regardless of the solar radiation condition.
    Type: Grant
    Filed: October 28, 2003
    Date of Patent: December 5, 2006
    Assignee: Denso Corporation
    Inventor: Hiroyuki Tomita
  • Patent number: 7134294
    Abstract: A method and apparatus for refrigeration system control includes a control system operable to meet cooling demand and control suction pressure for a plurality of refrigeration circuits each including a variable valve and an expansion valve. The controller controls the variable valve independently of the expansion valves to meet cooling demand by determining a change in a measured parameter and controlling at least one of the variable valves based upon the change to an approximately fully open position.
    Type: Grant
    Filed: May 13, 2005
    Date of Patent: November 14, 2006
    Assignee: Computer Process Controls, Inc.
    Inventors: Abtar Singh, Jim Chabucos, Paul Wickberg, John G Wallace
  • Patent number: 6993922
    Abstract: An apparatus for controlling the temperature of an electronic device under test includes a thermal head having a temperature controlled surface for making thermal contact with the electronic device. The thermal head defines a flow channel for passage of a refrigerant fluid so as to cause transfer of thermal energy between the electronic device and the thermal head. A refrigeration system is connected in fluid communication with the flow channel of the thermal head to supply refrigerant fluid thereto. The refrigeration system includes a metering valve operative to regulate introduction of the refrigerant fluid into the thermal head. A controller is operative to control the metering valve for maintaining a predetermined temperature at the temperature controlled surface.
    Type: Grant
    Filed: December 29, 2003
    Date of Patent: February 7, 2006
    Assignee: Delta Design, Inc.
    Inventors: Charles B. Wall, Cynthia M. Barnes
  • Patent number: 6957545
    Abstract: An air conditioning apparatus preferentially ventilates a space close to a seat and/or a steering wheel on which a passenger directly makes a contact in a passenger compartment while a vehicle is parked. The uncomfortable feeling of a passenger that might occur when he/she is getting into the parked vehicle can be reduced using a small capacity in the air conditioning as compared to the air conditioning apparatus ventilating the whole space in the vehicle.
    Type: Grant
    Filed: December 1, 2003
    Date of Patent: October 25, 2005
    Assignee: Denso Corporation
    Inventor: Shinji Aoki
  • Patent number: 6923014
    Abstract: An exemplary embodiment is a cooling system for cooling multiple logic modules. The cooling system includes a condenser, a first electrically controlled expansion valve coupled to the condenser and a first evaporator coupled to the first electrically controlled expansion valve. A second electrically controlled expansion valve is coupled to the condenser and a second evaporator coupled to the second electrically controlled expansion valve. A controller provides control signals to the first electrically controlled expansion valve and the second electrically controlled expansion valve to control operation of the first electrically controlled expansion valve and the second electrically controlled expansion valve. A compressor is coupled to the first evaporator, the second evaporator and the condenser.
    Type: Grant
    Filed: September 2, 2003
    Date of Patent: August 2, 2005
    Assignee: International Business Machines Corporation
    Inventors: Gary F. Goth, Daniel J. Kearney, Robert P. Makowicki, W. David McClafferty, Donald W. Porter
  • Publication number: 20040261431
    Abstract: A system for monitoring a remote refrigeration system includes a plurality of sensors that monitor parameters of components of the refrigeration system and a communication network that transfers signals generated by each of the plurality of sensors. A management center receives the signals from the communication network and processes the signals to determine an operating condition of at least one of the components. The management center generates an alarm based on the operating condition.
    Type: Application
    Filed: April 27, 2004
    Publication date: December 30, 2004
    Inventors: Abtar Singh, Thomas J. Mathews, Stephen T. Woodworth
  • Publication number: 20040118137
    Abstract: A system and method for cooling a room configured to house a plurality of computer systems. A heat exchanger unit is configured to receive air from the room and to deliver air to the room. The heat exchanger unit is supplied with cooling fluid operable to cool the received air in the heat exchanger unit. At least one of the temperature of the cooling fluid supplied to the heat exchanger unit and the air delivery to the room may be controlled in response to temperatures sensed at one or more locations in the room.
    Type: Application
    Filed: October 31, 2003
    Publication date: June 24, 2004
    Inventors: Chandrakant D. Patel, Cullen E. Bash
  • Publication number: 20040118136
    Abstract: A system and method for cooling a room configured to house a plurality of computer systems. A heat exchanger unit is configured to receive air from the room and to deliver air to the room. The heat exchanger unit is supplied with cooling fluid operable to cool the received air in the heat exchanger unit. At least one of the temperature of the cooling fluid supplied to the heat exchanger unit and the air delivery to the room may be controlled in response to temperatures sensed at one or more locations in the room.
    Type: Application
    Filed: October 31, 2003
    Publication date: June 24, 2004
    Inventors: Chandrakant D. Patel, Cullen E. Bash
  • Publication number: 20040107713
    Abstract: An air conditioning apparatus preferentially ventilates a space close to a seat and/or a steering wheel on which a passenger directly makes a contact in a passenger compartment while a vehicle is parked. The uncomfortable feeling of a passenger that might occur when he/she is getting into the parked vehicle can be reduced using a small capacity in the air conditioning as compared to the air conditioning apparatus ventilating the whole space in the vehicle.
    Type: Application
    Filed: December 1, 2003
    Publication date: June 10, 2004
    Inventor: Shinji Aoki
  • Publication number: 20040103675
    Abstract: In a vehicle air conditioner, at least one of an inner surface temperature of a passenger compartment and a surface temperature of a passenger in each detection area is the passenger compartment is detected by an infrared rays sensor, and a control unit determines a solar radiation condition such as a solar radiation amount and a solar radiation direction in the passenger compartment based on the surface temperature detected by the infrared rays sensor. The control unit controls operation of an operation member such as an air mixing door, based on the determined solar radiation condition. Thus, uncomfortable feeling given to the passenger can be reduced regardless of the solar radiation condition.
    Type: Application
    Filed: October 28, 2003
    Publication date: June 3, 2004
    Inventor: Hiroyuki Tomita
  • Patent number: 6668570
    Abstract: An apparatus for controlling the temperature of an electronic device under test includes a thermal head having a temperature controlled surface for making thermal contact with the electronic device. The thermal head defines a flow channel for passage of a refrigerant fluid so as to cause transfer of thermal energy between the electronic device and the thermal head. A refrigeration system is connected in fluid communication with the flow channel of the thermal head to supply refrigerant fluid thereto. The refrigeration system includes a metering valve operative to regulate introduction of the refrigerant fluid into the thermal head. A controller is operative to control the metering valve for maintaining a predetermined temperature at the temperature controlled surface.
    Type: Grant
    Filed: May 31, 2001
    Date of Patent: December 30, 2003
    Assignee: Kryotech, Inc.
    Inventors: Charles B. Wall, Cynthia M. Barnes
  • Patent number: 6578375
    Abstract: The performance of mobile air conditioning systems is improved with the use of a pressure sensing valve to control refrigerant flow in the system. The pressure sensing valve is connected between the condenser and the evaporator. The control valve senses the refrigerant pressure adjacent the evaporator, ie. the input, or output, or the combination of both, to control the refrigerant flow through the evaporator in a manner to improve the performance of the system. The reference pressure for the valve can be the atmosphere or a fixed or variable source. Various other operating variables can be sensed to control the variable source in a manner to interact with the sensed pressure to provide added control of system performance.
    Type: Grant
    Filed: March 1, 2001
    Date of Patent: June 17, 2003
    Inventor: Rene F. Bascobert
  • Patent number: 6519959
    Abstract: An air conditioner having a permanent magnet electric motor with a high output power characteristic in a cooling and heating range and a high output characteristic even in defrosting operation in a high-speed range.
    Type: Grant
    Filed: October 12, 2001
    Date of Patent: February 18, 2003
    Assignee: Hitachi, Ltd.
    Inventors: Houng Joong Kim, Yasuo Notohara
  • Patent number: 6446450
    Abstract: An improved refrigeration system utilizing a subcooler/economizer is provided. The refrigeration system comprises a compressor, a condenser, a refrigeration case, and an evaporator for cooling the refrigeration case. The refrigeration system may further include a subcooler. A modulating evaporator pressure regulator valve is located downstream of the evaporator, on the return line between the subcooler and the compressor. The valve controls the suction gas pressure of the compressor which, in turn, controls the liquid temperature of the refrigerant entering the evaporators. The modulation of the pressure regulator valve is dependent on the dew point of the store and/or the temperature of the liquid entering the evaporators.
    Type: Grant
    Filed: September 29, 2000
    Date of Patent: September 10, 2002
    Assignee: Firstenergy Facilities Services, Group, LLC
    Inventor: Kevin T. Pressler
  • Publication number: 20020116941
    Abstract: An air conditioner having a permanent magnet electric motor with a high output power characteristic in a cooling and heating range and a high output characteristic even in defrosting operation in a high-speed range.
    Type: Application
    Filed: October 12, 2001
    Publication date: August 29, 2002
    Applicant: Hitachi, Ltd.
    Inventors: Houng Joong Kim, Yasuo Notohara
  • Patent number: 6430947
    Abstract: The performance of mobile air conditioning systems is improved with the use of a pressure sensing valve to control refrigerant flow in the system. The pressure sensing valve is connected between the condenser and the evaporator. The control valve senses the refrigerant pressure adjacent the evaporator, ie. the input, or output, or the combination of both, to control the refrigerant flow through the evaporator in a manner to improve the performance of the system. The reference pressure for the valve can be the atmosphere or a fixed or variable source. Various other operating variables can be sensed to control the variable source in a manner to interact with the sensed pressure to provide added control of system performance.
    Type: Grant
    Filed: March 26, 2001
    Date of Patent: August 13, 2002
    Inventor: Rene F. Bascobert
  • Publication number: 20020002834
    Abstract: In a hot-water supply system with a heat pump cycle, a control unit controls operation of an expansion valve based on a temperature difference between a refrigerant temperature at an outlet side of a refrigerant passage in a water heat exchanger and a water temperature at an inlet side of a water passage in the water heat exchanger. When the expansion valve is controlled in a direction increasing a valve opening degree, the control unit sets an upper limit opening degree of the expansion valve, for obtaining a refrigerant pressure corresponding to a target hot-water temperature, and controls the expansion valve in an opening degree range smaller than the upper limit opening degree.
    Type: Application
    Filed: June 4, 2001
    Publication date: January 10, 2002
    Inventors: Jyouji Kuroki, Hisayoshi Sakakibara, Tomohisa Yoshimi, Tomoaki Kobayakawa, Kazutoshi Kusakari, Michiyuki Saikawa
  • Patent number: 6324858
    Abstract: The motor power consumption and motor winding temperature are monitored and, responsive thereto, the flow of refrigerant to the motor is controlled so as to control the temperature of the motor. The motor power consumption in the primary control input because it anticipates cooling requirements whereas the motor temperature indicates current cooling requirements. The cooling flow may be provided in an on-off manner or there may be a constant flow portion with an on-off parallel cooling flow path.
    Type: Grant
    Filed: November 27, 1998
    Date of Patent: December 4, 2001
    Assignee: Carrier Corporation
    Inventor: Steven J. Holden
  • Patent number: 6276154
    Abstract: A two-step metering device for controlling the flow of an operating fluid to a variable capacity compressor is provided. The metering device includes a valve that defines a fluid flow path having a large orifice configured to allow a flow rate corresponding to a high operating capacity of the compressor and a small orifice configured to allow a flow rate corresponding to a reduced operating capacity of the compressor. The metering device further includes a control operable to adjust the valve to direct the operating fluid through the large orifice when the compressor is operating at the high capacity and to direct fluid through the small orifice when the compressor is operating at the reduced capacity.
    Type: Grant
    Filed: February 4, 2000
    Date of Patent: August 21, 2001
    Assignee: Bristol Compressors, Inc.
    Inventor: Larry Pippin
  • Patent number: 6230506
    Abstract: A heat pump cycle system which can switches cooling operation and heating operation for a compartment includes a first inside heat exchanger and a second inside heat exchanger disposed in an air conditioning case. The first inside heat exchanger is disposed in the air conditioning case at a downstream air side of the second inside heat exchanger, while being arranged in line in a flow direction of refrigerant. The first inside heat exchanger is upstream from the second inside heat exchanger in the flow direction of refrigerant during the heating operation. In the heat pump cycle system, an expansion valve is controlled so that coefficient of performance in each operation becomes approximately maximum. Thus, during the heating operation of the heat pump cycle system, a lower limit temperature of air blown from the inside heat exchangers can be increased so that temperature of air blown into the compartment is increased, while the coefficient of performance is improved.
    Type: Grant
    Filed: August 23, 1999
    Date of Patent: May 15, 2001
    Assignee: Denso Corporation
    Inventors: Shin Nishida, Yukikatsu Ozaki, Naruhide Kimura, Tadashi Hotta, Motohiro Yamaguchi
  • Patent number: 6148628
    Abstract: An system and process for controlling an electronic exchange valve for an transport refrigeration system evaporator in the absence of a evaporator outlet pressure transducer reading is disclosed. The process includes monitoring for the absence of reliable evaporator outlet pressure readings, monitoring the supply air temperature, and supplying the supply air temperature to a processor within a controller for use in an algorithm so as to approximate the saturation reference temperature and superheat levels to derive the necessary control signals for the EXV.
    Type: Grant
    Filed: March 26, 1999
    Date of Patent: November 21, 2000
    Assignee: Carrier Corporation
    Inventors: John Robert Reason, Joao Eduardo Navarro de Andrade
  • Patent number: 6141981
    Abstract: A system and process for optimizing the power drawn on a transport refrigeration system under power limitation conditions is disclosed. The invention includes a microprocessor control which adjusts the desired superheat level for the system, thereby altering the expansion valve, thereby limiting the mass flow rate of refrigerant through the system without having a comparable drop in refrigeration capacity as would a similar actuation of the suction modulation valve.
    Type: Grant
    Filed: March 26, 1999
    Date of Patent: November 7, 2000
    Assignee: Carrier Corporation
    Inventors: John Robert Reason, Joao Eduardo Navarro de Andrade
  • Patent number: 6073459
    Abstract: In order to suppress the deterioration of the efficiency of the refrigeration cycle when the theoretical supercooling degree is different from the actual supercooling degree due to an error of a sensor, upon a decision that an expansion valve opening degree remains unchanged after the lapse of a predetermined time following the starting of an air-conditioning system, a target supercooling degree is corrected and the valve opening degree is reduced from an upper limit by a predetermined value to an intermediate valve opening degree. As a result, the actual supercooling degree can leave the state of zero dryness, and can approach a target supercooling degree.
    Type: Grant
    Filed: November 24, 1998
    Date of Patent: June 13, 2000
    Assignee: Denso Corporation
    Inventor: Kunio Iritani
  • Patent number: 6050098
    Abstract: A method of controlling an expansion valve including the steps of: measuring a primary system condition; determining an error in the primary system condition; measuring a secondary system condition; determining an error in the secondary system condition; and modulating the expansion valve based upon the larger of the first or second error.
    Type: Grant
    Filed: April 29, 1998
    Date of Patent: April 18, 2000
    Assignee: American Standard Inc.
    Inventors: Jonathan M. Meyer, Lee L. Sibik
  • Patent number: 6032472
    Abstract: The expanded flow through a heat exchanger type economizer is controlled by an electronic expansion valve and is supplied to the motor of a motor compressor to cool the motor. The electronic expansion valve is controlled by a microprocessor responsive to the temperature of the motor winding sensed by a thermistor.
    Type: Grant
    Filed: December 6, 1995
    Date of Patent: March 7, 2000
    Assignee: Carrier Corporation
    Inventors: Anton D. Heinrichs, Stanley R. Grant
  • Patent number: 6018959
    Abstract: In a method for controlling the superheat temperature (T.sub.u) of the refrigerant in an evaporator arrangement (1) of a refrigeration system or heat pump system (1-4), the evaporator arrangement (1), a compressor arrangement (2), a condenser and a controllable expansion valve (4) are arranged in succession in a closed circuit. The superheat temperature (T.sub.u) is controlled in dependence on a comparison between desired and actual values. The desired value (W.sub.2) of the superheat temperature (T.sub.u is varied automatically in dependence on the difference (d) from a reference value (W.sub.1) of a periodically determined function (S) of a number of sampled values of a temperature (T.sub.1 ; T.sub.2) of the refrigerant with the aim of a stable control of the superheat temperature (T.sub.u). To achieve optimum filling and to optimize the superheating in such systems, provision is made for the said function (S) to characterize the variability of a number of sampled values of the temperature (T.sub.
    Type: Grant
    Filed: May 8, 1998
    Date of Patent: February 1, 2000
    Assignee: Danfoss A/S
    Inventor: Frede Schmidt
  • Patent number: 5956962
    Abstract: An air conditioner in accordance with the invention comprises a first unit including a compressor and a heat exchanger; a second unit including a heat exchanger; a refrigerant circuit connecting the compressor and the heat exchanger of the first unit, with the heat exchanger of the second unit, through which a refrigerant flows; a refrigerant pressure reduction valve disposed in the refrigerant circuit and provided in the second unit; a control unit provided in the first unit for controlling the refrigerant pressure reduction valve in the second unit.
    Type: Grant
    Filed: August 6, 1997
    Date of Patent: September 28, 1999
    Assignee: Hitachi, Ltd.
    Inventors: Hiroshi Takenaka, Hirokiyo Terada, Minetoshi Izushi, Kensaku Oguni, Makoto Nagai, Shunji Sasaki, Yasuji Sakuma, Kenji Tokusa
  • Patent number: 5910161
    Abstract: A liquid injection type scroll compressor is used to a refrigerating apparatus using hydrocarbon fluoride refrigerant which does not contain chlorine (HFC-125/HFC-143a/HFC-134a) as an operating fluid and an amount of an injected liquid is controlled according to a discharge temperature of the compressor. Further, ester oil and/or ether oil is used as refrigerator oil and a dryer is disposed in a refrigerating cycle. With this arrangement, a refrigerating cycle operation can be stably realized in a wide range without almost changing the arrangement of a conventional refrigerating apparatus.
    Type: Grant
    Filed: April 2, 1997
    Date of Patent: June 8, 1999
    Inventors: Makoto Fujita, Yoshikazu Amo
  • Patent number: 5867998
    Abstract: A controller operates an electronic expansion valve (EEV) to control flow of refrigerant in an evaporator coil of a refrigeration system. The controller measures a superheat of the coil over a natural fill and boil cycle of the coil to determine an average rate at which the flow of refrigerant into the coil produces a desired temperature difference across the coil. The controller then operates the valve in a manner to control the flow of refrigerant based on the average rate.
    Type: Grant
    Filed: February 10, 1997
    Date of Patent: February 9, 1999
    Assignee: EIL Instruments Inc.
    Inventor: Lawrence J. Guertin