Abstract: An apparatus and method for operating an appliance in an energy conservation mode is described. The appliance includes a number of peripheral devices and auxiliary components ancillary to main operation of the appliance, and the method includes reducing power to at least some of the peripheral devices and auxiliary components in an energy conservation mode, thereby reducing energy consumption by the peripheral devices and auxiliary components.

Abstract: Method for controlling operation of a refrigerator including the steps of turning on a compressor when a temperature of a food storage chamber reaches to an upper limit of upper/lower temperature deviations &Dgr;T from an optimal setting temperature T, turning off the compressor when the temperature of the food storage chamber reaches to a lower limit of upper/lower temperature deviations &Dgr;T from the optimal setting temperature T, and varying the upper/lower temperature deviations &Dgr;T with an outside temperature.

Abstract: A method of operating a refrigeration system having a discharge port that guides conditioned air from the system to a conditioned space and a return port that guides air from the conditioned space back to the system. The method comprises providing a first control algorithm and second control algorithm for controlling the system. The first control algorithm is a function of the air temperature at the discharge port, and the second control algorithm is a function of the air temperature at the return port. The method further comprises operating the system using the first control algorithm when a first condition is met, operating the system using the second control algorithm when a second condition is met, and automatically switching between the first control algorithm and the second control algorithm depending on the status of the first and second conditions.

Abstract: Variable displacement compressors (101) include a displacement control valve (181) that is in communication with a drive chamber (111). The output displacement of the compressor varies in response to changes in pressure within the drive chamber. A controller (203) may control the displacement control valve so that the pressure within the drive chamber is maintained within a predetermined range. Further, the predetermined range may be determined based upon one or more factors that cause fluctuations in the pressure within the drive chamber during operation of the compressor.

Abstract: A hybrid compressor apparatus for a refrigerant cycle is mounted on a vehicle having an engine that stops in accordance with driving conditions of the vehicle. The apparatus includes an electrical motor, a compressor driven by at least one of the engine and the motor for compressing refrigerant in the refrigerant cycle, a controller for controlling operation of the motor and the compressor and for selecting a driving source between the engine and the motor so as to drive the compressor, and a switch for manually setting a normal mode and an economy mode in the refrigerant cycle. The motor drives the compressor when the economy mode is selected while the engine stops. Therefore, an operation load of the compressor can be reduced in the economy mode, and fuel consumption can be reduced.

Abstract: A direct cooling type refrigerator includes: a main body with a certain space for keeping food items; a freezing chamber formed at an upper portion of the main body and keeping frozen food items; a refrigerating chamber sectioned by a barrier with the freezing chamber, formed at a lower portion of the main body and keeping refrigerated food items; a freezing chamber evaporator buried in a side wall of the freezing chamber and directly heat-exchanged with air inside the freezing chamber; and a refrigerating chamber evaporator buried in a side wall of the refrigerating chamber and directly heat-exchanged with air inside the refrigerating chamber.

Abstract: Disclosed herein is a multi-compartment type refrigerator and method for controlling the same. The refrigerator includes a plurality of storage compartments. A plurality of evaporators are each positioned in each of the storage compartments, respectively. A compressor supplies refrigerant to the evaporators through a branched refrigerant conduit. A plurality of opening/closing valves are each positioned on a refrigerant conduit upstream of each of the evaporators for selectively controlling supply of refrigerant to the evaporators. Reference compartment defining means defines as a reference storage compartment one of the storage compartments that has a relatively great load. Control means controls starting of the compressor depending on a change of a temperature of the reference storage compartment.

Abstract: A control unit for variable displacement compressors is used for two independent air conditioning cycles, wherein two compressors 1, 11 driven by a common external drive source 8 include electromagnetic displacement control valves 6, 16, respectively. By controlling these control valves by ECU 7, the displacement of the compressor is variable. When the air temperature is higher than a predetermined temperature To, both of the compressors are subjected to the variable displacement operation even though one of them is unnecessary for the air conditioning operation. On the contrary, if the outer air temperature is lower than the predetermined temperature, only one compressor, needed for the air conditioning operation, is subjected to the variable displacement operation, while the other compressor is subjected to the minimum displacement operation.

Abstract: A refrigeration system for cooling a logic module includes an evaporator housing including an evaporator block in thermal communication with the logic module. The evaporator housing includes a humidity sensor for detecting a humidity within the evaporator housing. The system further comprises a controller for controlling a refrigeration unit supplying cold refrigerant to the evaporator block in response to the operating conditions of the logic module and the temperature of the evaporator block. In another aspect of the invention, two modular refrigeration units are independently operable to cool the evaporator block, and each refrigeration unit is controllable in various modes of operation including an enabled mode in which it is ready to cool the evaporator and an on mode in which it is actively cooling the evaporator. In another aspect of the invention, the evaporator block and a heater on a reverse side of the circuit board are particularly controlled during concurrent repair operations.

Abstract: A vehicle air conditioning system mountable on a vehicle has the control function of stopping a vehicle engine automatically when the vehicle stops (eco-run vehicle). The system includes a variable displacement compressor driven by the vehicle engine, and a stop time of the vehicle engine is ensured when the vehicle stops. When the engine is running, the displacement of the variable displacement compressor is adjusted to control the temperature of an evaporator. When the vehicle engine stop request is issued when the vehicle is stopped, the compressor is kept at its maximum displacement and the vehicle engine is either stopped or activated depending on the temperature of the evaporator to control the on and off modes of the compressor.

Abstract: In a vehicle air conditioner, a temperature sensor is disposed on a tank of an evaporator to contact the tank. In addition, the temperature sensor is disposed at a tank position separated from a refrigerant inlet and a refrigerant outlet. Accordingly, a downstream space of the evaporator can be effectively used, and the size of the air conditioner can be reduced while the temperature of the evaporator can be accurately detected using the temperature sensor.

Abstract: Disclosed is a property box of a cabinet/wall-hanging type requiring low temperature. The property box of a cabinet/wall-hanging type requiring low temperature according to the present invention provides advantages of being attachable to a wall surface or a corner of living space such as a bedroom of a married couple, a dress room or a bathroom in a newly-built or an existing apartment, an ordinary house or in lodging so as to store and make easily available of cosmetics, pharmaceuticals, films, beverage, beer or wine requiring low temperature whenever necessary. When protection of a privacy is required, unlike the conventional refrigerator shared by others in a shared living space, the property box according to the present invention can be installed at a desired position, thereby achieving the protection of privacy and resolving the problem of narrowing the living space subsequent to installation of the property box.

Abstract: An apparatus and method for operating an appliance in an energy conservation mode is described. The appliance includes a number of peripheral devices and auxiliary components ancillary to main operation of the appliance, and the method includes reducing power to at least some of the peripheral devices and auxiliary components in an energy conservation mode, thereby reducing energy consumption by the peripheral devices and auxiliary components.

Abstract: A vehicle air conditioner control apparatus having a telecommunication cable communicating between a remote control and a drive control to facilitate system operation and construction. The apparatus includes an input part for enabling a driver to control operations of the air conditioner; the remote control part for transforming a manipulated signal of the input part to a transmission signal and sending same through a communication cable; the drive control part for generating and outputting a signal to drive the air conditioner correspondingly to the transmission signal received from the remote control part; a drive part for operating according to the drive signal output from the drive control part and performing a function to cool off the vehicle; and a compressor pressure switch for showing the input status of the compressor.

Abstract: The present invention provides a controlling apparatus and a controlling method for a mode change type refrigerating system allowing the most appropriate temperature control even with respect to various heating loads. When a person sets a target temperature setter and a fan setter in a motor vehicle as desired, a unit to be connected with a mode change condition circuit 101 is determined from among control units and from among calculation units of speed revision. A capacity control instruction value (Duty 1) calculated by controlling a temperature and a capacity control instruction value (Duty 2) calculated by revising a speed are added, then the capacity of a variable capacity type gas compressor is controlled with reference to a capacity control instruction value (Duty 3) as the added signal.

Abstract: A service device for a refrigerator having a refrigerating chamber, the device having an electric circuit portion and a mechanical portion. The electric circuit portion is connectable to the refrigerator outside the refrigerating chamber, and the mechanical portion is at least partly insertable inside the refrigerating chamber and cooperates with the electric circuit portion.

Abstract: Optimized control algorithms for a vehicle automatic climate control system (ACCS) are developed using math-based models of the vehicle, the ACCS and a vehicle occupant. The models are cross-coupled in closed-loop fashion with feedback from both vehicle systems and occupant. A first feedback loop including the vehicle and the ACCS, simulates how the ACCS interacts with the cabin environment; and a second feedback loop including the vehicle, the ACCS and the occupant, simulates how the occupant will adjust the ACCS to optimize comfort. When the system arrives at a control algorithm that satisfies control objectives and optimizes occupant comfort, an auto-code generation tool is used to create program code directly from the control model, which may be downloaded into a test vehicle for final system confirmation and calibration.

Abstract: A separate-type air conditioner that can reduce the effect of voltage fluctuations in a commercial power supply (12) on a compressor (11), reduce material costs while maintaining vibrations of an outdoor unit (2) at low levels, and improve working efficiency during an assembly operation. The outdoor unit (2) includes a voltage correction circuit (14) to keep an output voltage to the compressor (11) constant (optimum) irrespective of the voltage fluctuations in the commercial power supply (12).

Abstract: The present invention relates to a control device for a household electrical appliance. The control device has an interface configured to enable a user to set or modify parameters of one or more operational members of the appliance by a command and control circuit in communication with the appliance. The interface has a one or more selectors arranged to enable setting or modifying of the parameters of the appliance. The selectors are connected to a resonant electrical circuit arranged to generate or to respond to a radio-frequency signal in a modifiable manner representative of the setting or modification effected by the user. The signal also being sensed by a sensor associated with the command and control circuit, which enables the command and control circuit to set or modify in an appropriate manner the parameters of the operational members for controlled operation of the household electrical appliance.

Abstract: A method and device (18) to control the temperature T in a refrigerator or freezer cabinet (10), which keep a set temperature in a space (12) in the cabinet. The space is refrigerated by an element (14) of an intermittently operating refrigerating machine (16). The refrigerator cabinet has a control gear (18), which consists of a first means (20) and a second means (22), a third means (24) and a fourth means (26). The first means is situated at the refrigerating element, which is placed in the space, and it measures a regulating temperature. The second means is arranged at a reference point in the space, and it measures a current temperature in the space. The third means compiles an average temperature of the current temperatures. The forth means compiles a discrepancy between the average temperature and a preset temperature.

Abstract: An optimized CO2 air-conditioning system for a vehicle has individual components designed and/or matched to one another in such a way that if the high pressures in the high-pressure section deviate by up to ±30% from the optimum high pressures, the associated optimum performance figures are reduced by no more than 20%. The individual components include a controllable compressor, a gas cooler, an internal heat exchanger, an evaporator and an accumulator. As a result, a fixed throttle expansion member can be used between the high-pressure and low-pressure sections of the system.

Abstract: In a method for driving an output stage by pulse-width modulation, which driving serves to supply a unit cooling the output stage during operation, at a higher temperature of the output stage a style of driving is performed which results in a low power loss in the output stage. At a lower temperature of the output stage driving is performed in such a way that the power loss is higher.

Abstract: An air conditioner for air conditioning the interior of a compartment includes a compressor and an electric motor. The compressor compresses refrigerant gas and changes the displacement. The electric motor drives the compressor. A motor controller rotates the motor at a constant reference speed. A detection device detects information related to the thermal load on the air conditioner. A current sensor detects the value of current supplied to the electric motor. A controller controls the compressor based on the detected thermal load information and the detected current value. The controller computes a target torque of the compressor based on the thermal load information. In accordance with the computed target torque, the controller computes a target current value to be supplied to the electric motor. The controller further controls the displacement of the compressor such that the detected current value matches the target current value.

Abstract: A direct cooling type refrigerator includes: a main body with a certain space for keeping food items; a freezing chamber formed at an upper portion of the main body and keeping frozen food items; a refrigerating chamber sectioned by a barrier with the freezing chamber, formed at a lower portion of the main body and keeping refrigerated food items; a freezing chamber evaporator buried in a side wall of the freezing chamber and directly heat-exchanged with air inside the freezing chamber; and a refrigerating chamber evaporator buried in a side wall of the refrigerating chamber and directly heat-exchanged with air inside the refrigerating chamber.

Abstract: Variable displacement compressors (101) include a displacement control valve (181) that is in communication with a drive chamber (111). The output displacement of the compressor varies in response to changes in pressure within the drive chamber. A controller (203) may control the displacement control valve so that the pressure within the drive chamber is maintained within a predetermined range. Further, the predetermined range may be determined based upon one or more factors that cause fluctuations in the pressure within the drive chamber during operation of the compressor.

Abstract: A method and a device for heating and cooling a compartment of a motor vehicle powered by an internal combustion engine are described. During a cooling operation, a medium in the circuit is guided through a compressor, an ambient heat exchanger, a throttle device, and an interior heat exchanger which are connected in series and form an integral closed circuit. On the high-pressure side of the circuit, a supercritical pressure is produced at the same time that a subcritical pressure is produced on the low-pressure side of the circuit. During a heating operation, the high-pressure side of the circuit during the cooling operation becomes the low-pressure side and the low-pressure side of the circuit during the cooling operation becomes the high-pressure side. The medium in the circuit is conducted in the interior heat exchanger at a supercritical pressure, with heat energy being transferred from the medium in the circuit to the compartment air supplied to the compartment.

Abstract: An improved, more efficient method of operation for a vehicle heating and air conditioning system electrically positions a temperature control actuator in accordance with a first temperature control schedule for coordinated control of compressor capacity and re-heating of the discharge air when air conditioning is enabled, in accordance with a second temperature control schedule when air conditioning is disabled. Both first and second temperature control schedules position the temperature control actuator as a function of the setting of the driver-manipulated temperature selector.

Abstract: A variable displacement type compressor circulates a refrigerant in an air conditioning circuit. The compressor has a compression mechanism and a displacement controller. The compression mechanism compresses and discharges the refrigerant. The displacement controller controls the discharge amount of the refrigerant of the compressor. The displacement controller further includes a normal control means and a protective control means. The normal control means controls the displacement based on a cooling load. The protective control means controls the displacement based on the value in connection with the rotational speed of the compressor and the actual operating information of the compressor.

Abstract: An air conditioning apparatus includes a refrigerant circulation circuit that has a compressor. A driving status of the compressor is detected by first detector. A first calculator calculates a theoretical torque and a driving efficiency of the compressor based on information from the first detector. A second calculator calculates a necessary torque required for driving the compressor. The second calculator calculates the necessary torque based on the theoretical torque.

Abstract: A vehicle air conditioning system mountable on a vehicle has the control function of stopping a vehicle engine automatically when the vehicle stops (eco-run vehicle). The system includes a variable displacement compressor driven by the vehicle engine, and a stop time of the vehicle engine is ensured when the vehicle stops. When the engine is running, the displacement of the variable displacement compressor is adjusted to control the temperature of an evaporator. When the vehicle engine stop request is issued when the vehicle is stopped, the compressor is kept at its maximum displacement and the vehicle engine is either stopped or activated depending on the temperature of the evaporator to control the on and off modes of the compressor.

Abstract: A brine cooling apparatus is provided which addresses an environmental problem by not contributing to global warming and can prevent brine from freezing within a heat exchanger. The apparatus is structured such that a screw compressor, a condenser, a main expansion valve and an evaporator are connected by a pipe so as to cool brine flowing through the evaporator. The refrigerant is an ammonia refrigerant, the evaporator is a plate type heat exchanger constructed by laying a plural sheets of plates, and capacity control means is provided in such a manner as to control a capacity of the screw compressor in accordance with the flow amount of the brine.

Abstract: A repository including: an input unit (3) for setting the temperature of the interior (2) of a repository (1); a measuring unit (5,6) for measuring the temperature of the interior of the repository (1); a controller (4) for holding ID data to specify the repository itself and communicatively outputting the measurement data to the external; and an auxiliary power source (13) for communicating the measurement data to the external even during interruption of power supply. A central controller 11 for collecting the measured data from each repository and judging whether abnormality occurs or not is connected to plural repositories to fabricate a monitoring system. When abnormality is detected, the measured data as well as ID data and time data are transmitted to a user through the Internet.

Abstract: The present invention relates to temperature control for refrigerators, which automatically adjusts the on-temp/off-temp values in view of the fluctuation of the ambient temperature. The present invention also relates to a refrigerator on which a sensor of simplified circuit design is reasonably allocated. In accordance with the present invention, ambient temperature is divided into a plurality of particular temperature divisions, the on-temp and off-temp values preferred for refrigerator operation in each corresponding temperature division are determined by experiments. By means of a temperature sensor, on-temp/off-temp values appropriately corresponding to a particular temperature division are applied to keep the temperature of the refrigerator at a required level.

Abstract: An electric compressor includes a motor and a compression mechanism that is driven by the motor. The compressor forms part of the refrigerant circuit of an air conditioner. A control apparatus of the compressor adjusts the rotation speed of the motor for controlling the amount of compressed refrigerant gas discharged from the compression mechanism, or the displacement of the compressor, per unit time. When the energy efficiency of the motor is lower than a predetermined level, the control apparatus performs on-off control by alternately turning off the motor. During the on-off control, a required amount of refrigerant gas discharged per unit time is obtained, and the energy efficiency of the motor in the on time is higher than the predetermined level.

Abstract: A removable food support element in a refrigerator, for example a shelf, drawer or the like, comprising a body to be positioned on supports present on opposing walls of a refrigerator compartment; there being provided, associated with the body of the element, setting means enabling the internal temperature of the refrigerator compartment to be set and the set temperature information to be transferred to control means for the refrigerator refrigeration circuit.

Abstract: Disclosed herein is a system and methods for maintaining a controlled environment having at least one storage compartment which includes at least one portal and additional includes at least one individualized freezer drawer having a sealing means, each storage compartment is maintained at a constant temperature, at least one individualized freezer drawer is accessed the constant temperature in the remaining area within each storage compartment is not altered; and at least one floating temperature room which includes a plurality of portals, each floating temperature room is adjacent and accessible to each storage compartment by at least one portal; and at least one working room which includes a plurality of portals, each working room is adjacent and accessible to each floating temperature room by at least one portal, the temperature in each working room is maintained higher temperature than the temperature in each floating temperature room; and at least one anteroom, wherein each anteroom includes at least two

Abstract: When an outdoor machine 2 includes a signal line connector 21 for receiving ON/OFF signals for a compressor, an outdoor machine drive control unit 30 of an air conditioner includes an inverter device 32 for supplying power variable in frequency to the compressor 22, and a control device 33 for controlling the inverter device 32 to gradually increase the number of revolutions of the compressor 22 when the ON/OFF signal for the compressor received through the signal line connector 21 changes from the OFF condition to the ON condition. The air conditioner outdoor machine drive control unit 30 enables to construct an inverter-type air conditioner by using a general heat-pump-type indoor machine and merely mounting it in an outdoor machine.

Abstract: A vehicle air conditioner control apparatus having a telecommunication cable communicating between a remote control and a drive control to facilitate system operation and construction. The apparatus includes an input part for enabling a driver to control operations of the air conditioner; the remote control part for transforming a manipulated signal of the input part to a transmission signal and sending same through a communication cable; the drive control part for generating and outputting a signal to drive the air conditioner correspondingly to the transmission signal received from the remote control part; a drive part for operating according to the drive signal output from the drive control part and performing a function to cool off the vehicle; and a compressor pressure switch for showing the input status of the compressor.

Abstract: A temperature controlled cabinet system of the present invention includes at least one heat pump, a controller assembly for controlling system operation and a temperature sensor for measuring a cabinet interior temperature. The heat pump heats and/or cools the cabinet interior to maintain the cabinet interior at a desired temperature in response to control signals from the controller assembly. The cabinet system further includes a thermal barrier to thermally isolate the cabinet interior from the ambient environment and permit access to medical items contained within the cabinet. The thermal barrier includes a plurality of strips that maybe arranged in various fashions (e.g., overlapped, spaced from each other a selected distance, etc.) to substantially impede or minimize heat exchange between the cabinet interior and ambient environment during intervals where the cabinet interior is exposed to that environment (e.g., intervals where at least one cabinet door is in an open state).

Abstract: A separate-type air conditioner that can reduce the effect of voltage fluctuations in a commercial power supply (12) on a compressor (11), reduce material costs while maintaining vibrations of an outdoor unit (2) at low levels, and improve working efficiency during an assembly operation. The outdoor unit (2) includes a voltage correction circuit (14) to keep an output voltage to the compressor (11) constant (optimum) irrespective of the voltage fluctuations in the commercial power supply (12).

Abstract: An air conditioning apparatus includes a refrigerant circulation circuit that has a compressor. A driving status of the compressor is detected by first detector. A first calculator calculates a theoretical torque and a driving efficiency of the compressor based on information from the first detector. A second calculator calculates a necessary torque required for driving the compressor. The second calculator calculates the necessary torque based on the theoretical torque.

Abstract: In a device for air temperature control in a vehicle either by use of a valve unit to control a portion of coolant and thereby the temperature of air flowing from the temperature control element, by a temperature of coolant controlled by said thermostat, or by speed of said fan, individually and independently from one another.

Abstract: A capacity control device controls a discharge capacity of a variable displacement compressor for use in an automotive air conditioning system. The air conditioning system has the compressor and an evaporator fan. The device includes a control, a first detector, and a second detector. The control changes the discharge capacity of the compressor between a minimum discharge capacity for that compressor and a maximum discharge capacity. The first detector detects an elapsed time of a minimum discharge capacity operation of the compressor. The second detector detects an impressed voltage of the evaporator fan of the air conditioning system. The discharge capacity increases from the minimum discharge capacity to a predetermined discharge capacity when the elapsed time of the minimum discharge capacity operation is greater than a predetermined time and when the impressed voltage of the evaporator fan is greater than a predetermined voltage.

Abstract: Control apparatus for an environmental control system comprises input circuitry receiving environmental information and output circuitry for controlling an HVAC system. Processing circuitry in the controller configures the output circuitry based at least in part on the signals received on the input circuitry. Information about the status of the HVAC system may be transferred to system administrators using a wireless link.

Abstract: A method of and apparatus for controlling a refrigeration plant having a cooler for cooling cooling air, the surface temperature of the cooler being measured by a single sensor and the cooling-air temperature being derived from the surface temperature of the cooler via a correction factor, the refrigeration plant then being controlled an the basis of the measured temperature value and the derived temperature value.

Abstract: A refrigerated soda vending machine includes sensors for monitoring various parameters such as temperature within its refrigerated chamber and for monitoring occupancy in the chamber vicinity. Sensor data is used to determine when to switch between normal and power-conservation modes of operation. In either mode, a cooling system is regulated so that a compressor goes on when an upper internal temperature threshold is reached and off when a lower internal temperature threshold is reached. In normal mode, fans circulate air to maintain a relatively uniform temperature throughout the chamber. During power-conservation mode, the fans are mostly off when the compressor is off. In the absence of circulation, the temperature within the refrigerated chamber stratifies so that a lower cool zone and an upper warm zone can be differentiated. Soda cans are held in vertical stacks so that the lowest cans are located in the cool zone.

Abstract: A method for controlling a refrigerator constructed with a main body formed with a storage compartment accommodating therein food, a door opening and closing the storage compartment, a temperature sensor provided within the main body, by detecting a temperature of the main body, cooling is provided to the main body to cool the storage compartment in steps of establishing a control temperature of the temperature sensor to correspond to the temperature of the storage compartment; and continuously operating the cooling means until the temperature detected by the temperature sensor reaches the control temperature at an initial operation state. With this configuration, because the compressor is continuously operated until the temperature detected by the temperature sensor reaches the control temperature, the rate of cooling the stored food is enhanced and at the same time a desired storage temperature is achieved.

Abstract: A vehicle air conditioner includes a variable displacement compressor forming a part of a coolant circuit, detectors for detecting external information necessary for air conditioning, and a controller. The compressor has pistons and mechanism for actuating the pistons to draw, compress and discharge refrigerant. The piston actuating mechanism is located in a crank chamber. The pressure in the crank chamber is changed to vary the compressor displacement. The controller controls the compressor based on the information from the detectors. When disengaging an electromagnetic clutch, which is located between a vehicle engine and the compressor, the controller quickly decreases the compressor displacement and prevents the pressure difference between the crank chamber and compression chambers excessively increased. Therefore, immediately after being stopped, the compressor is started at the minimum displacement, which minimizes the shock due to load torque change on the engine.

Abstract: A control for a refrigeration system serviced by a special pulse width modulated compressor coupled to a condenser and evaporator. The system can be of the distributed type wherein the condenser and compressor may be coupled to service a group of adjacent refrigeration cases, wherein each case would have its own evaporator. A controller is coupled to a load sensor for producing a variable duty cycle control signal in which the duty cycle is a function of demand for cooling. Moreover, fuzzy logic techniques may be utilized in order to provide self adaptive tuning control for the system.

Abstract: A two-stage reciprocating compressor is provided. The compressor includes a block with a single cylinder and associated single compression chamber and single piston. The compressor further includes a crankshaft. The crankshaft has an eccentric crankpin that is operatively connected to the piston. A reversible motor is provided to rotate the crankshaft in a forward direction and in a reverse direction. An eccentric cam is rotatably mounted on the eccentric crankpin. The eccentric cam is held stationary with respect to the crankpin when the crankshaft is rotating in the forward direction. When rotating in the forward direction, the crankshaft drives the piston at a full stroke between a bottom position and a top dead center position. The eccentric cam rotates with respect to the crankpin when the crankshaft is rotating in the reverse direction. When rotating in the reverse direction, the crankshaft drives the piston at a reduced stroke between an intermediate position and the top dead center position.