Abstract: The present invention is a cold control for refrigerators. The cold control circuit includes temperature sensitive resistances disposed within the cold box portion of the refrigerator. The cold control circuit senses the temperature of the cold box portion by a NTC thermistor which is disposed in the cold box portion and connected to the control circuit. When the temperature rises above the turn-on set point, the NTC thermistor has a relatively small resistance and activates a transistor. The transistor is connected to a latching circuit which maintains activation of the refrigerator until the thermistor falls below the turn-off point. Another solid state switch of the control circuit activates the refrigerator compressor, such as a transistor turning on an inverter in a DC powered refrigerator and a triac directly supplying current in an AC powered refrigerator.

Abstract: An electronic expansion valve is provided between first and second indoor heat exchangers. At the time of cooling operation, the electronic expansion valve is fully opened with the result that the first and second indoor heat exchangers are communicated with each other. At the time of dehumidifying operation, the opening of the electronic expansion valve is decreased to apply the effect of pressure reduction between the indoor heat exchangers, so that the first indoor heat exchanger functions as a reheater and the second indoor heat exchanger functions as an evaporator. The air in the room is cooled and dehumidified by the second indoor heat exchanger and then discharged into the room after being reheated by the first indoor heat exchanger. At the time of the dehumidifying operation, controlling the speed of the outdoor fan permits the temperature of the air discharged into the room to be varied.

Abstract: An automatic operation control method automatically controls the temperature setting of a chamber, the defrost cycling and the operation of a compressor and a fan motor according to the door open/close frequency and open time. The defrost cycling is operated during a predetermined time period or an auxiliary time period according to the usage frequency of a refrigerator and the door open time before entering into the defrost cycle while being started after dropping the chamber temperature according to the current state of a temperature adjuster and the average value of the chamber temperature. The operation of a compressor and a fan motor is retarded to prevent the chamber temperature from increasing after the completion of the defrost cycling, thereby minimizing the temperature change of the chamber to protect the stored food.

Abstract: An adaptor is designed to mount a duty cycling control switch for a furnace or air conditioning system which has flexible duct work. The adaptor includes two opposite cylindrical sections with a central section which includes an arcuate portion and a planar rectangular portion. The planar rectangular portion is tangential to the surfaces of the first and second cylindrical sections. The duty cycling control switch is mounted to this planar portion. Thus, air passing through the duct work will pass through this adaptor altering the temperature of the rectangular plate, thus, altering the temperature of the duty cycling switch causing it to activate.

Abstract: A detected temperature T.sub.m of the atmosphere of a remote controller is read in at a predetermined detection time interval. When a difference between a present or new detected temperature T.sub.m and a last or old detected temperature T.sub.m(old) is above a predetermined value, a first correction value corresponding to the temperature difference (T.sub.s -T.sub.m) is added to a set temperature T.sub.s set in advance to thereby determine a set temperature T.sub.sc. On the other hand, when a difference between a present or new detected temperature T.sub.m and a last or old detected temperature T.sub.m(old) is less than the predetermined value, a second correction value corresponding to the temperature difference (T.sub.s -T.sub.m) is added to the last or old set temperature T.sub.sc(old) to thereby determine a corrected set temperature T.sub.sc, thus to operate a compressor motor in dependency upon a difference between the corrected set temperature T.sub.

Abstract: The present invention relates to a plural temperature adjustment apparatus for a refrigerator whereby adequate cooling grades are automatically changed based on the temperature changes inside a refrigerator and driving time, and more particularly to a plural temperature adjustment apparatus for a refrigerator whereby prolonged of life time of a compressor, reduction of electric power consumption by way of the control of frequent intermittency of a compressor and the effect of temperature adjustment by timer operation even during blackout can be achieved by adequate control of the present temperatures in a refrigerator detected by a temperature detecting part and appropriate control of compressor drivings based on door open/close status detected at a door open/close detecting part and driving time by a timer when temperatures and driving time according to respective cooling grades randomly set up by the user thru the operation part are inputted into a micro computer.

Abstract: A multichamber air conditioner which is provided with a unit for obtaining the characteristics which are approximately conformable to the reverse characteristics of the desired control dynamic characteristics, an integrator, a unit for receiving the detected room temperature as the input of the above described reverse characteristics unit, comparing the output of the above described reverse characteristic unit with the set value, inputting the compared results to the above decided integrator, controlling the opening of the expansion valve by the output of the integrator, outputting the integration gains of the above described integrator in accordance with the open air temperatures, the total sum of the number of driver stands, the performance, and the variation in the compressor suction pressure.

Abstract: A control system for controlling the operation of an air conditioning compressor and method of making the same are provided, the system comprising a thermostat switch and a high pressure switch arranged in series with a compressor switch across two sides of a power source whereby the thermostat switch and the high pressure switch must be in a closed condition thereof with the compressor switch also being in a closed condition before the compressor can be turned on, the system also comprising a low pressure switch that is arranged so as not to be in series with the other switches across the two sides of the power source and a microprocessor having means operatively associated with the low pressure switch to monitor the condition thereof.

Abstract: A household type refrigerator has a refrigeration system including a subcooling flow control valve placed between the outlet of the condenser and the inlet to the capillary tube. The subcooling flow control valve utilizes a sealed capsule of refrigerant which operates to open and close a valve to modulate the flow from the condenser to the capillary tube to insure only that a subcooled liquid enters the capillary. The valve is mounted vertically next to the compressor and has the inlet line to the valve secured in heat conducting contact to the return line to the compressor for faster opening and closing response while the discharge side of the valve has a chamber filled with a plug to minimize the volume of refrigerant remaining between the closed valve and the entrance to the capillary when the compressor is on the off cycle.

Abstract: The present invention provides a method of controlling an air conditioning apparatus and the air conditioning apparatus which uses the control method to set a difference between a room temperature and a temperature of a discharged air from the air conditioning apparatus at a appropriate value to provide pleasant cooling to an individual. The present invention controls the rotational speed of the compressor in accordance with the difference between an actual room temperature and a target room temperature and additionally controls the rotational speed of the compressor corresponding to the difference between the actually discharged air temperature from the compressor and a target discharge temperature of the compressor.

Abstract: Compressor discharge capacity is controlled by using the smaller value as a desired cooling temperature for control, comprising a first desired evaporator cooling temperature computed from the pattern of the desired cooling temperature characterized by its being high when a cooling load is low, with a second desired evaporator cooling temperature computed from the pattern of the desired cooling temperature characterized by its being high when the outdoor temperature is moderate, and by its being low when the outdoor temeprature is low or high. Therefore, if the desired temperature is set high in a passenger compartment when the outdoor temperature is high, or if a cooling load is low when the outdoor temperature is low, the desired cooling temperature can be kept low for controlling while maintaining high dehumidifying capacity.

Abstract: A method of refrigerator control for operating a refrigerator which may experience an abnormal temperature condition due to operation in low ambient temperatures includes a temperature sensor for sensing the temperature of a portion of a refrigerator compartment in order to detect an abnormally low temperature in another portion of the compartment. If the compartment temperature at the end of a predetermined length of time since cooling was last supplied to the compartment is below a predetermined value, then an abnormal condition is assumed to exist and corrective action is taken to eliminate the abnormal condition. A preferred form of corrective action is to prevent compressor re-energization until the compartment temperature reaches a second predetermined value.

Abstract: Disclosed is an improved air conditioning system of the type having a refrigerant which sequentially flows through compressor means, condenser means in heat exchange relationship with outdoor air, expansion means, and evaporator means for the direct or indirect cooling of air in a confined space for maintaining the confined air space at a desired set point of temperature and/or humidity. The improvement for maintaining said set point of temperature and/or humidity of the confined space at variable heat loads therein and at variable outdoor air temperature comprises variable speed compressor means responsive to varying outdoor air temperature for attenuating refrigerant mass flow corresponding to lower outdoor air temperature; and expansion means responsive to attenuated refrigerant mass flow for maintaining adequate refrigerant mass flow to the evaporator means for maintaining constant the desired set point of temperature and/or humidity of the confined space at varying outdoor air temperature.

Abstract: A method of operating a transport refrigeration system having a compressor driven by a prime mover at a selected one of high and low speeds, an evaporator, and an evaporator blower driven by the prime mover. Refrigeration control provides an error value which controls the temperature of a load space to a predetermined set point via heating and cooling modes. The method includes the steps of driving the compressor at high speed during pull down, and injecting hot gas into the evaporator when the error is reduced to a predetermined value. The prime mover is maintained at high speed, to keep evaporator air flow at a high rate, continuing a relatively rapid temperature pull-down across the entire load space. The speed of the prime mover is reduced to low speed when the error is further reduced to a second value, which also initiates suction line modulation while maintaining hot gas injection.

Abstract: A method of operating a compartmentalized transport refrigeration system having first, second and third compartments respectively served by a host refrigeration unit and first and second remote refrigeration units. The method includes the steps of providing a first signal when either of the first and second remote refrigeration units is in a cooling cycle, cycling the host refrigeration unit between cooling and heating cycles to hold a selected set point temperature of a fresh load in the first compartment, in the absence of the first signal, and providing a predetermined null period between the heating and cooling cycles of the host unit when the first signal is present. In a preferred embodiment a prime mover for a refrigerant compressor is operable at a selected one of high and low speeds, with the method including the step of preventing high speed operation when any remote refrigeration unit is in a heating cycle.

Abstract: In an air conditioner including a variable-capacity compressor, a control system performs a PI calculation based on a temperature deviation between the actual temperature of the air downstream of an evaporator and its target temperature, thereby determining a control amount for controlling the capacity of the compressor. It is judged whether or not the sum of a proportional control component and an integral control component exceeds a limit value of the control amount corresponding to the maximum capacity of the compressor. If this judgment is in the affirmative, an ordinary integral calculation is stopped, and the integral control component is determined by subtracting the proportional control component from this limit value.

Abstract: Refrigerant flowing through each air conditioning unit of a multiple air conditioning system is respectively detected by a refrigerant flow sensor provided in each air conditioning unit and the degree of opening of a refrigerant flow control valve arranged in each air conditioning unit is controlled in response to the detection result of the corresponding refrigerant flow sensor to supply an appropriate amount of refrigerant to each air conditioning unit. The capacity of the compressor of a refrigerant supply unit of the multiple air conditioning system is controlled based on the detection result of each refrigerant flow sensor and the actual opening degree of each refrigerant flow control valve.

Abstract: A display case includes a display case housing having an open upper end. Fitted over the open upper end is a removable cooling unit which has an inlet opening and an outlet opening both in communication with the interior of the display case. The cooling unit draws air into the cooling unit, cools the air, and recirculates it into the display case. The cooling unit can be removed from the upper end of the housing for repair, and can be replaced with a similar unit so that the display case can continue to be used. A modified form of the invention includes a cooling unit which is insertable into the display compartment of the display case adjacent the bottom wall thereof.

Abstract: In a heat pump heating apparatus of this invention, a compressor included in a refrigerating cycle is operated at a speed corresponding to a blowoff temperature so that the temperature of air blown off into a room through an indoor fan from a condenser becomes close to a set value when a room temperature is less than its set value. The indoor fan is operated depending upon a room temperature, i.e., is operated under the state of a relatively great airflow when the room temperature is far lower than its set value and is operated under the state of a relatively small airflow when the room temperature is closer to its set value.

Abstract: An automobile air conditioner system including a refrigerant circuit having a condenser, expansion element, evaporator and wobble plate type compressor with a variable displacement mechanism. Two passages communicate between the crank chamber and the suction chamber in the cylinder block. A bellows is disposed in a first passage and controls the communication between the crank chamber and the suction chamber response to crank chamber pressure. A control valve is disposed in the second passage and controls communication between the crank chamber and the suction chamber in the second passage in response to a signal representing the temperature of the air immediately leaving from the evaporator. An electric clutch is mounted on the compressor in order to intermittently transmit the rotational motion of an automobile engine to the drive shaft of the compressor in response to the signal.

Abstract: A rotatable control for a broad range, temperature controlling thermostat for a refrigeration compartment of a refrigeration unit enables operation of the refrigeration unit in one of several different operational modes. For example, the refrigeration unit may be operated as a wine cooler or as a standard refrigerator or as a freezer. The control includes a control dial having four, integrally formed, spaced apart stops formed on an inner surface. A stop formed on a cover of the thermostat may be placed between a pair of adjacent stops formed on the control dial to prevent adjustment of the set-point temperature of the refrigeration compartment outside of the particular temperature range associated with the preselected operational mode of the refigeration unit.

Abstract: This invention concerns an apparatus for computing a recognized value as one of the control elements for an automobile air-conditioning system, which apparatus performs the computation of the recognized value by a procedure which comprises detecting an amount of solar radiation with the aid of solar radiation amount detection means, forming a decision as to the trend of variation of the amount of solar radiation with the aid of comparison means, and performing an operation of integration of a recognized value of the amount of solar radiation with the aid of arithmetic operation means by using a relatively small time constant when the decision is that the amount of solar radiation is on the upward trend or a relatively large time constant when the decision is the opposite. The air conditioning, therefore, is controlled so as to follow the variation in the amount of solar radiation when this amount is on the upward trend or to remain in the present status when the amount is on the downward trend.

Abstract: An automotive air tempering apparatus for use in an automotive vehicle having a duct through which air is directed into a passenger compartment. The apparatus comprises an air chilling unit including an evaporator provided in the duct and a compressor having a displacement variable for supplying a controlled amount of refrigerant to the evaporator for chilling the air in the duct. A control unit controls the displacement of the compressor to bring the refrigerant temperature to a target value when air is introduced into the duct from the atmosphere. The control unit controls the displacement of the compressor to bring the chilled air temperature to a target value when air is introduced into the duct from the passenger compartment.

Abstract: A refrigerator apparatus is provided having a cabinet with a freezer compartment and a fresh food compartment. The compartments define two passageways allowing air circulation therebetween. A refrigerator system is included having a compressor, a condenser, an expansion valve, an evaporator situated in the freezer compartment. The refrigerator system elements are connected in series in a closed loop, in a refrigerant flow relationship. A first fan is situated in the freezer compartment for providing air flow over the evaporator. A second fan is situated in one of the two passageways for providing air circulation between the two compartments. A first thermostatic controller situated in the freezer compartment by causing the compressor and the first fan to operate.

Abstract: With a process for controlling the operating of a refrigerating unit with an evaporator and a fan, the fan being cut in and cut out independently of the refrigerating unit, which is cut in at a predetermined cut-in temperature, above a set value, and is cut out at a predetermined cut-out temperature, below the set value, to save energy for the refrigerating operation, whenever there is a cutting-out operation of the refrigerating unit, the fan likewise cuts out and then cuts in again as soon as a predetermined cut-in temperature of the fan, lying below the cut-in temperature of the refrigerating unit, is reached.

Abstract: A method and system for conditioning the cargo containing space of a vehicle are disclosed wherein refrigerated or heated air is introduced into a supply duct and circulated through the cargo to a return duct. The return duct or ducts are preferably formed by movable reefer pallets or racks, controlled openings in the pallets regulating flow into the return duct to develop a uniform pressure differential between the cargo space and the return duct and achieve more uniform cooling. Heat barrier spacers are arranged on vertical walls to minimize heat passage to the cargo. A method and system are also disclosed for supplying refrigerated gas through a supply duct and returning it through a return duct, a control unit being normally responsive to a master temperature sensor arranged in an inlet, a sub-master temperature sensor being arranged for sensing freezing or chilling conditions and overriding the master temperature sensor.

Abstract: An apparatus for controlling a displacement changing unit of a variable displacement type refrigerant compressor arranged in a car air-conditioner circuit, including a refrigerant evaporator for cooling air for air-conditioning a compartment of a car, is provided with a temperature detecting device for detecting an actual temperature of the air for air-conditioning the car compartment, a temperature setting switch for setting a desired temperature of the air for air-conditioning the car compartment, a unit for generating an electric signal indicating a change in an operating condition of the air blowing fan of the refrigerant evaporator, a control unit for carrying out a PID control to control the operation of the displacement changing unit of the compressor in response to a difference between the actual and desired temperatures and a signal of a unit for generating an electric signal indicating a change in the operating condition of the air blowing fan, to thereby eliminate the difference between the desired

Abstract: A control assembly for a household refrigerator having a mullion partition separating the freezer compartment and the fresh food compartment with a front face and a bottom panel forming the top of the fresh food compartment. There is a control bracket mounted on the bottom panel at the rear of the mullion partition and this bracket has a circular aperture with two radial notches. A thermostat having a rotatable stem for adjusting the thermostat setting is mounted on the control bracket. There is a rotatable hub member having a circular central portion with radial lugs slightly smaller than the circular aperture and radial notches of the control bracket. The portion of the central portion that projects through the circular aperture and radial notches is rotated to mount the hub member on the control bracket. There is an aperture in the center of the circular central portion to receive the rotatable stem of the thermostat and it is dimensioned to rotate the stem in unison with rotation of the hub member.

Abstract: A method of controlling a refrigeration system by determining an average air temperature by sensing and averaging evaporator return and discharge air temperatures, and developing an average error by using the average air temperature and a selected set point temperature. The average air temperature is then used to calculate a proportional error and an integral error, and the discharge air temperature is used to calculate a floor error. The proportional error, integral error and floor error are weighted by predetermined gain factors and then summed to provide an error signal which is used to modulate the capacity of the refrigeration system, with the control mode depending upon the location of the error signal relative to set point.

Abstract: Methods and apparatus for controlling the load temperature of a transport refrigeration system to a selected set point temperature by operating modes which include a high capacity cooling mode and a lower capacity cooling mode. The rate of change of the load temperature is monitored by time and temperature integration when the lower capacity cooling mode is entered, to insure that the lower capacity cooling mode has adequate capacity to reduce the load temperature to set point within an acceptable period of time. If the set point temperature is not reached within a period of time which is a function of time, load temperature relative to set point, and the rate of change of load temperature relative to set point, a signal is provided which forces the system to the higher capacity cooling mode until the set point temperature is reached.

Abstract: A ratiometric temperature controller for a transport refrigeration system, and a method of controlling the load temperature of a transport refrigeration system with digital signals provided in response to an analog ratio between the load temperature and a selected set point temperature. A logic array is programmed to provide a plurality of transport refrigeration system control signals in response to predetermined values of the digital signal. The resolution of the control is increased by having the digital signal respond to a temperature range relatively close to set point, which is a much smaller range than the temperature range over which the set point may be selected. The logic array will respond to a forcing signal which, when true, indicates the need for a high speed cooling mode, when the load temperature is above set point and the system is already in a cooling mode.

Abstract: A refrigeration cycle or an air conditioner including a refrigeration cycle is subjected to feedback control based on modern control theory. An apparatus controlling a controlled object, that is, the refrigeration cycle of the air conditioner including the refrigeration cycle, is formed as an optimal regulator. A controlled input to the controlled object includes a capacity of a compressor or a degree of opening of an expansion valve. A control output from the controlled object includes a temperature of air at a point downstream of the evaporator or a superheat of refrigerant. Feedback gains are predetermined by use of dynamic models constructed for respective steady operation states of the controlled object.

Abstract: A control device for an air conditioner including a compressor driven by an inverter is disclosed. The control device comprises a floor temperature sensor as well as a room temperature sensor for detecting representative room temperature. A standard operation frequency of the compressor is determined on the basis of the difference between the target temperature and the representative room temperature detected by the room temperature sensor. Adjustment is made to the standard operation frequency according to the difference between the temperatures detected by the two temperature sensors, thereby obtaining an operation frequency of the compressor.

Abstract: An air-conditioning apparatus for automobiles comprises a device for detecting the internal air temperature providing the temperature in the automobile cabin, a device for detecting the atmospheric air temperature, a device for setting a target value of the internal air temperature, a device for calculating a target value of the air blowdown temperature from the output signals of the aforementioned three devices, a device for calculating a compensation amount for the compressor capacity from the difference between the target value and the output signal of a device for detecting the actual air blowdown temperature, and a device for controlling the compressor capacity in accordance with the result of the calculation.

Abstract: An automotive air conditioning apparatus including means for heating the refrigerant prior to its entry into the compressor during the idle phases thereof when the air conditioner is operating, thereby to lower the specific volume of the refrigerant initially to reduce the degree of filling of the compressor when it is subsequently engaged, for reducing the jolt which would otherwise be noticable at the moment the compressor is engaged.

Abstract: When the temperature of an internal heat-exchanger decreases below a first value in cooling mode, a normal operation, wherein a variable capacity compressor operates in response to the temperature in a space to be cooled, stops temporarily, and a defrost operation, in which the driving frequency of the compressor periodically decreases by a prescribed value until the temperature of the internal heat-exchanger increases above a second value greater than the first value, begins. When the temperature of the internal heat-exchanger increases above a second value greater than the first value, the compressor operates in response to the temperature in the space. When the compressor stops during the defrost operation, the temperature of the internal heat-exchanger is compared with a third value greater than the second value and the operation of the compressor responding to the temperature in the space is inhibited until the temperature of the internal heat-exchanger increases above the third value.

Abstract: A process and processor for an air conditioning system in which, in addition to the values recorded for the interior temperature, the outside air temperature, the temperature after the evaporator and the ventilation temperature after the heating element, the value recorded by a further sensor of the relative humidity of the outside air for controlling the relative humidity of the interior air are supplied to an evaluation unit and correspondingly further processed.

Abstract: This invention relates to a system for the control of electrical apparatus with particular reference to control by electric sensors, and with special reference to a control system for domestic appliances, such as refrigerators. The system may be adapted to control of appliances such as dishwashers, dryers, washers, stoves, etc. The preferred embodiment is microcomputer based. Thus, the system enables lower energy consumption, more accurate temperature maintenance and more effective servicing and monitoring of the mechanical condition of the apparatus to which it is applied.

Abstract: A cold-accumulation type refrigerator having variable length cycle for cooling by means of the cold-accumulation material. The cycle length is a function of refrigerator load. The refrigerator includes a refrigerating cycle to cool a refrigerator compartment and the cold-accumulation material, a load detecting device, such as a room temperature detecting device, to measure an amount of a load to be cooled, clock counting device to generate a time data, and a control device, such as microcomputer. The control device controls the operation of the refrigerator which operates in a first mode (ordinary cooling operation), a second mode wherein the refrigerator compartments are cooled by means of the cold accumulation material and a third mode wherein the cold accumulation material is cooled. The control device controls the time period for second and third mode operation as a function of load to be cooled.

Abstract: An air conditioner having a thermal insulation cover forming a pocket around the thermostat bulb which is mounted to the outside wall of the air intake chamber. The cover has an aperture and the outside wall has a plurality of holes communicating with the pocket whereby, when the blower is activated, a flow of ambient room air is drawn through the pocket so that the bulb accurately reflects the temperature of the room being cooled. The cover thermally isolated the thermostat bulb from hot outside fresh air so that the thermostat bulb is not falsely biased.

Abstract: A refrigerator control for operating a refrigerator which may experience an abnormal temperature condition due to operation in low ambient temperatures includes a temperature sensor for sensing the temperature of a portion of a refrigerator compartment in order to detect an abnormally low temperature in another portion of the compartment. If the compartment temperature at the end of a predetermined length of time since cooling was last supplied to the compartment is below a predetermined value, then an abnormal condition is assumed to exist and corrective action is taken to eliminate the abnormal condition. A preferred form of corrective action is to prevent compressor re-energization until the compartment temperature reaches a second predetermined value.

Abstract: In an improved control for a refrigerator, critical components such as fresh food and freezer compartment temperature sensors, temperature set devices and baffle are sampled to conform that each is operational. Upon diagnosis of a critical component failure or of multiple component failures, the control, using stored control parameters, operates the remaining components in a manner that will continue to preserve food.

Abstract: A ratiometric temperature controller for a transport refrigeration system, and a method of controlling the load temperature of a transport refrigeration system with digital signals, without the necessity of utilizing a digital computer. The method, implemented by the ratiometric controller, includes the steps of providing an analog ratio between the load temperature and a selected set point temperature, converting the analog ratio to a digital signal, and providing a logic array which is programmed to provide a plurality of transport refrigeration system control signals in response to predetermined values of the digital signal.

Abstract: A low-temperature showcase comprises a heat insulated wall, on the top of which an opening for putting-into or taking-out commodities is formed. The inside of the heat insulated wall is divided into an air passage and a storage chamber thereover by a dividing plate which is installed inside this heat insulated wall in a nearly horizontal fashion. The air passage is formed in a manner that the cross-section thereof is of a U-shape, and the storage chamber is formed surrounded by this air passage. At both ends of the air passage, vent ports are formed at the positions facing each other through the opening of the heat insulated wall inbetween. The air passage is divided into two parts by a fan case corresponding to the respective vent ports and a blast fan which can rotate reversibly is supported by this fan case. In each halved air passage, an evaporator is installed in the vicinity of the vent port, and when one of the evaporators is put in cooling operation, the other evaporator is subjected to defrosting.

Abstract: A refrigerated appliance for use as a salad bar includes an enclosure having a refrigeration unit mounted therein and a cooled food storage compartment. An upper wall of the storage compartment is provided with openings for receiving a plurality of foodstuff containers having bottom wall surfaces which extend into the compartment. An air inlet opening from the refrigeration unit is disposed proximate to the upper wall of the compartment and cool air issuing therefrom is directed at the exposed wall surfaces of the containers. To concentrate the air flow at the containers a duct surrounds the air inlet opening and is spaced closely from the containers. A free end of the duct is open to the storage compartment for circulation of the air through the compartment.

Abstract: In an improved control for a refrigerator, critical components such as fresh food and freezer compartment temperature sensors, temperature set devices and baffle are sampled to confirm that each is operational. Upon diagnosis of a critical component failure or of multiple component failures, the control, using stored control parameters, operates the remaining components in a manner that will continue to preserve food.

Abstract: A refrigerator temperature control system is disclosed in which the compressor for compressing a refrigerant is driven selectively at either a normal lower rotation speed or a higher rotational speed and the higher rotational speed is applied only when any of the freezer compartment temperature and the fresh food compartment temperature is not reduced below a predetermined temperature level for at least a predetermined time interval.

Abstract: An air conditioning method with use of an air conditioner comprises a step of determining whether or not an input signal is produced from a plurality of switches for providing conditions, a step of determining an established temperature on the basis of the signal from the switches, a step of comparing data provided by the established temperature determining step with the room temperature detected by the temperature detector to produce a signal, and a step of controlling the compressor based on the signal as a result of the comparison.

Abstract: The present invention continuously speed-controls an electric motor for driving a compressor for refrigerant compression such that the compressor is driven in its maximum rpm if the difference (temperature deviation) between a target cooling temperature and an actual temperature is greater than a first predetermined value, the compressor is stopped if the temperature deviation is less than a second predetermined value, and the compressor is speed-controlled by a digital control signal if the temperature deviation is between said first and second predetermined values.

Abstract: A control device for a variable capacity compressor in an automotive air conditioning system. The control device includes a first sensor disposed forward of the evaporator and a second sensor disposed behind the evaporator. The control device compares the air temperature detected by the sensors with predetermined temperatures, and controls the capacity of the compressor in accordance with the compared results.