Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
  • F25D29/00—Arrangement or mounting of control or safety devices
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
  • F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
  • F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
  • F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
  • F25D17/062—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation in household refrigerators
  • F25D17/065—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation in household refrigerators with compartments at different temperatures
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B2600/00—Control issues
  • F25B2600/02—Compressor control
  • F25B2600/025—Compressor control by controlling speed
  • F25B2600/0251—Compressor control by controlling speed with on-off operation
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
  • F25B2600/00—Control issues
  • F25B2600/11—Fan speed control
  • F25B2600/112—Fan speed control of evaporator fans
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
  • F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
  • F25D2317/06—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation
  • F25D2317/068—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the fans
  • F25D2317/0682—Two or more fans
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
  • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
  • F25D2400/04—Refrigerators with a horizontal mullion
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
  • F25D2700/00—Means for sensing or measuring; Sensors therefor
  • F25D2700/12—Sensors measuring the inside temperature
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
  • F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
  • F25D2700/00—Means for sensing or measuring; Sensors therefor
  • F25D2700/12—Sensors measuring the inside temperature
  • F25D2700/122—Sensors measuring the inside temperature of freezer compartments
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
  • Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers

Definitions

• the present invention refers to a refrigeration control system to be applied to combined refrigeration appliances that present a refrigerating compartment and a freezing compartment, each provided with a forced air flow which is refrigerated in an evaporator and blown by a respective fan.
• each of the refrigerating and freezing compartments is provided with a temperature sensor operatively associated with an electronic control module or means which is designed to command the activation of the fans of said compartments and of the compressor of the refrigeration circuit of the refrigeration appliance.
• the refrigerating compartment temperature sensor informs the control means about the activation and deactivation temperatures of the refrigerating compartment fan, in order to vary the cool air supply to the compartment as a function of the temperature detected by the refrigerating compartment temperature sensor.
• the freezing compartment temperature sensor informs the control means about the activation and deactivation temperatures of the freezing compartment fan and of the compressor.
• Such refrigeration control system allows the refrigerating compartment fan to operate independently of the freezing compartment fan, according to the temperature signals that the refrigerating compartment temperature sensor sends to the control means .
• loss of synchrony in the operation of both fans can usually occur, since the refrigerating compartment fan can be activated by the control means as a function of the temperature condition detected by the refrigerating compartment temperature sensor, even with both the compressor and the freezing compartment fan being deactivated.
• the operation mentioned above is not prejudicial, since the activation of the refrigerating compartment fan without activation of the compressor causes the latter to be reactivated more rapidly, promoting cooling of the refrigerating compartment .
• the present invention provides a refrigeration control system for combined refrigeration appliances of the type comprising: a refrigerating compartment provided with at least one refrigerating compartment temperature sensor; a freezing compartment provided with a freezing compartment temperature sensor; a compressor; an evaporator; a refrigerating compartment fan and a freezing compartment fan to produce respective forced air flows through the evaporator and through the refrigerating compartment and the freezing compartment, respectively; and a control means to activate and deactivate the compressor and the refrigerating compartment and freezing compartment fans as a function of the activation and deactivation temperatures detected by the refrigerating compartment temperature sensor and the freezing compartment temperature sensor.
• the control means is operatively associated with the refrigerating compartment fan to selectively and periodically adjust the speed of the latter, so that the temperature of refrigerating compartment, detected by the refrigerating compartment temperature sensor, reaches deactivation value of the refrigerating compartment fan at the same time in which the temperature of the freezing compartment, detected by the freezing compartment temperature sensor, reaches a deactivation value of both the freezing compartment fan and the compressor.
• the control means verifies, periodically, the cooling degree reached in both the refrigerating and freezing compartments, verifying whether the cooling speed of the refrigerating compartment is faster or slower than the cooling speed of the freezing compartment.
• the refrigerating compartment fan Upon being detected a certain difference in the cooling progress between both compartments, the refrigerating compartment fan has its speed raised or reduced so as to approximate the cooling degree of the refrigerating compartment to the cooling degree already reached in the freezing compartment, aiming at obtaining the completion of both refrigeration operations at the same instant and to allow the simultaneous deactivation of both fans and of the compressor.
• the increases and reductions of the speed of the refrigerating compartment fan are preferably determined by a nominal speed percentage value of said fan, allowing the periodic verifications of the control means to lead to a progressive approximation of the two cooling degrees of the refrigerating compartment and the freezing compartment.
• the control means of the present invention further allows the user to instruct the refrigeration appliance to operate in a "vacation mode", according to which the operational temperature ranges of the refrigerating and freezing compartments are reduced to a less cool condition and the speeds of the refrigerating compartment and freezing compartment fans are set to constant low values .
• the control means is constructed to allow the refrigerating appliance to selectively operate in a "party mode” , according to which the operational temperature range is adjusted to its cooler value and the speed of the refrigerating compartment fan is set to a constant maximum value.
• Figure 1 is a schematic median vertical sectional view of a combined refrigeration appliance provided with the control system of the present invention
• Figures 2 and 2a illustrate, jointly, a block diagram showing the processing steps which are carried out by the control means to effect the settings in the operation of the refrigeration appliance.
• the present refrigeration control system is applied to a combined refrigeration appliance whose cabinet 10 defines, internally, a refrigerating compartment R and a freezing compartment F which are respectively closed by front doors 11, 12.
• a refrigerating compartment R and a freezing compartment F which are respectively closed by front doors 11, 12.
• an evaporator 20 which in the illustrated embodiment is positioned in the internal rear region of the freezing compartment F.
• the refrigerating compartment R is provided with a refrigerating compartment temperature sensor Sr and the freezing compartment with a freezing compartment temperature sensor Sf, said temperature sensors being operatively associated with a control means 30 adequately secured to the cabinet 10 usually in the lower rear portion of the latter.
• Cabinet 10 further houses a refrigerating compartment fan 40 and a freezing compartment fan 50 which are positioned and dimensioned to produce respective forced air flows through the evaporator 20 and through the refrigerating and freezing compartments R and F, respectively.
• the refrigerating compartment and freezing compartment fans 40 and 50 are operatively associated with the control means 30, which is also operatively coupled to a compressor 60 of the refrigeration system of the refrigeration appliance.
• the construction defined above allows the control means 30 to activate and deactivate the compressor 60 and the refrigerating compartment and freezing compartment fans 40 and 50 as a function of the activation and deactivation temperatures detected by the refrigerating compartment and freezing compartment sensors Sr and Sf.
• control means 30 is operatively associated with the refrigerating compartment fan 40 to adjust, selectively and periodically, the speed of the latter, in order to make the temperature of the refrigerating compartment R, detected by the refrigerating compartment temperature sensor Sr, to reach a deactivation value of the refrigerating compartment fan 40 substantially at the same time in which the temperature of the freezing compartment F, detected by the freezing compartment temperature sensor Sf, reaches a deactivation value of the freezing compartment fan 50 and of the compressor 60.
• the concept used in the present invention is mainly based on the periodic adjustment of the speed of the refrigerating compartment fan 40, in order to make the cooling of the refrigerating compartment R to end at the same time of the cooling of the freezing compartment F, whereby the respective refrigerating compartment and freezing compartment temperature sensors Sr and Sf will simultaneously inform the control means 30 that the deactivation temperatures of both the refrigerating compartment fan 40 and the freezing compartment fan 50 jointly with the deactivation of compressor 60 have been reached.
• the balance in the cooling time of the refrigerating and freezing compartments R and F leads to a synchronized operation of both the refrigerating compartment fan 40 and the freezing compartment fan 50 with the compressor 60 consequently operating in periodic regular cycles, allowing an optimized energy consumption to be obtained in terms of compressor operation.
• the selective and periodic adjustment of the speed of the refrigerating compartment fan 40 occurs whenever the ratio between the cooling detected in the refrigerating compartment R and measured from the activation temperature and the maximum cooling defined between the activation and deactivation temperatures of the refrigerating compartment fan 40 differs by an absolute value higher than a determined balance value from the ratio, between the cooling of the freezing compartment F measured from the activation temperature and the maximum cooling defined between the activation and deactivation temperatures of the freezing compartment fan 50.
• Said balance value between the cooling ratios detected in the refrigerating and freezing compartments R and F can be defined by a variation from about 5% to about 20% between said ratios, i.e., while the variation between the cooling ratios remains within about higher or lower values from about 5% to about 20%, the control means 30 will maintain the speed of the refrigerating compartment fan 40 unaltered, modifying said speed to higher or lower values when said difference between both cooling ratios surpasses the exemplary balance value of about 5% to about 20%.
• the speed of the refrigerating compartment fan 40 is increased when the cooling ratio in the refrigerating compartment R is more than about 5% to about 20% lower than the cooling ratio of the freezing compartment F and also when the relation between the cooling ratio of the refrigerating compartment R and the cooling ratio of the freezing compartment F is negative.
• the speed of the refrigerating compartment fan 40 is reduced when the cooling ratio of the refrigerating compartment R is more than about 5% to about 20% higher than the cooling ratio of the freezing compartment F.
• the periodic speed settings of the refrigerating compartment fan 40 are achieved, when necessary, by speed variations which represent a percentage, for example of about 10% the nominal speed of the refrigerating compartment fan 40.
• control means 30 can be constructed to compare the cooling ratios of both the refrigerating compartment R and the freezing compartment F in time intervals of five minutes for example, the need for adjusting the speed of the refrigerating compartment fan 40 can be checked in said time intervals during each operating period of the compressor, allowing that at each check the speed of the refrigerating compartment fan 40 can be varied by the necessary increase or reduction, in order to progressively approximate the cooling ratio of the refrigerating compartment R to the cooling ratio of the freezing compartment F.
• the setting of the speed of the refrigerating compartment fan 40 is effected by the control means 30 from a calculation using the following mathematical expression: Tsf - Taf dF Tdf - Taf dR Tsr - Tar Tdr - Tar
• dF is the cooling ratio of the freezing compartment F
• dR is the cooling ratio of the refrigerating compartment R.
• the cooling ratio dF of the freezing compartment F is obtained by dividing the difference between the activation temperature Taf of the freezing compartment fan 50 in the freezing compartment F and the sensed temperature Tsf in said freezing compartment F by the difference between the activation Taf and deactivation Tdf temperatures of the freezing compartment fan 50 in said freezing compartment F.
• the cooling ratio dR of the refrigerating compartment R is obtained by dividing the difference between the activation temperature Tar of the refrigerating compartment fan 40 in the refrigerating compartment R and the sensed temperature Tsr in said refrigerating compartment R by the difference between the activation Tar and deactivation Tdr temperatures in the refrigerating compartment fan 40.
• the numerator of said mathematical expression shows how much the freezing compartment F has been cooled and how much it is close to reach the deactivation temperature Tdf in which the compressor 60 and the freezing compartment fan 50 will be deactivated.
• the denominator of said mathematical expression shows how much the refrigerating compartment R has been cooled and how much it is close to reach the deactivation temperature Tdr in which the refrigerating compartment fan 40 is deactivated.
• the quotient of the cooling ratios dR, dF gives a relative comparison of said compartments, informing how much each compartment has been cooled during its cooling process until the deactivation temperatures Tdr and Tdf of the respective refrigerating compartment fan 40 and freezing compartment fan 50 have been reached.
• the control means 30 is preferably programmed to evaluate the expression above at each operating time period of about 1-5 minutes, commanding the adjustment of the speed of the refrigerating compartment fan 40 in the same frequency and according to the table given below, considering the balance value as being for example 10%
• the control means 30 At the end of the operating time of one cycle of the compressor 60, the control means 30 records the speed of the refrigerating compartment fan 40 and uses it as the initial speed in the next operating cycle of the compressor 60. Thus, a transient situation persists in the first cycles until the control means 30 finds the adequate initial speed for the synchronization of the operating cycles of the refrigerating 40 and freezing compartment fans. From this moment on, the permanent regime is established and the cyclic operation, in the ideal conditions to reduce energy consumption, is repeated.
• control system is programmed to activate the refrigerating compartment fan 40 even with the compressor 60 being deactivated, when the temperature of the refrigerating compartment R reaches a predetermined limit value that is above the activation temperature Tar of the refrigerating compartment fan 40.
• control system gives priority to the performance of the refrigerating compartment in detriment of the synchronization of the fans, when such synchronization is capable of producing a prejudicial unbalance in the operational temperature of the refrigerating compartment R.
• Another important aspect of the present control system is the protection which allows the temperature of the refrigerating compartment R to remain the more stable possible.
• Some "loss of control" in the temperature of the refrigerating compartment R can occur when the refrigerating compartment fan 40 is prevented from being activated and the temperature Tsr detected by the refrigerating compartment temperature sensor Sr is above the activation temperature Tar of said refrigerating compartment fan 40, but below the predetermined limit value from which the refrigerating compartment fan 40 is activated independently of the state in which the compressor 60 is found.
• Such "loss of control” is characterized by the elevation of the medium temperature of the refrigerating compartment R when, in some circumstances, the refrigerating compartment fan 40 is activated, in the start of the activation cycle of the compressor, by several successive cycles above its activation temperature Tar.
• the control system is programmed to reduce the deactivation temperature Tdr of the refrigerating compartment fan 40 during at least one operating cycle of the latter, whenever it is activated at least two consecutive times and with the temperature of the refrigerating compartment R situated between the activation temperature Tar of the refrigerating compartment fan 40 and the predetermined limit value.
• the present refrigeration control system further allows the user to adjust the operation of the fans and consequently of the compressor 60 to a reduced and temporary special usage pattern which commonly occurs in periods of vacation or trips during which the refrigeration appliance operates without any modification occurring in its inner load or without any of its doors being opened.
• control means 30 is constructed so that it can be optionally and selectively conducted to operate in a "vacation" mode, according to which the activation temperatures Tar, Taf and deactivation temperatures Tdr and Tdf of the refrigerating compartment fan 40 and the freezing compartment fan 50 are raised to a "less cool” condition and the speed of the said refrigerating compartment fan 40 and freezing compartment fan 50 are set to constant reduced values.
• the benefit to the user is translated in energy saving during the time in which the "vacation" function or mode is activated. The user activates this function through the electronic control panel and the duration period is indefinite, lasting until the function is deactivated or until one of the doors 11 or 12 of the refrigeration appliance is opened.
• the control means 30 can be optionally and selectively conducted, by the user instructing an electronic control panel of the refrigeration appliance to work in a "party" mode, in which: the activation temperature Tar and deactivation temperature Tdr of the refrigerating compartment fan 40 are reduced to a cooler condition; the activation temperature Taf and deactivation temperature Tdf of the freezing compartment fan 50 are maintained in the operating condition originally selected by the user for the refrigeration appliance; the speed of the refrigerating compartment fan 40 is set to a maximum value; and the speed of the freezing compartment fan 50 is maintained in a constant reduced value.
• the actions resulting from the party mode lead to a total priority of the refrigerating compartment R in detriment of the freezing compartment F.
• the freezing compartment F remains operating normally, according to the operational temperature selected by the user, it being understood that its operating condition is not adequate to great demands in relation to door openings and relevant loadings .
• the refrigerating compartment R operates in the most favorable condition, to positively and rapidly respond to great demands, keeping the stored foods and beverages in adequate conditions and propitiating a more efficient cooling of the load to be replaced.
• FIGS. 2 and 2a of the appended drawings illustrate, jointly and in block diagrams, the operation of the refrigeration control system of a combined refrigeration appliance of the type illustrated in figure 1 described above.
• control means 30 is operatively associated with the refrigerating compartment fan 40 and freezing compartment fan 50 and to the refrigerating compartment and freezing compartment temperature sensors Sr and Sf and also with the compressor 60, in order to drive said fans and the compressor according to the temperature parameters informed to the control means 30 through the refrigerating compartment and freezing compartment temperature sensors Sr and Sf.
• the control means 30 is provided with a clock of adequate construction (not illustrated) and is also operatively associated with a control panel (not illustrated) of the refrigeration appliance which functions as an interface between said appliance and the user, so that the latter can modify or set the operational characteristics of the refrigeration appliance.
• the control system is initiated from a condition in which the compressor 60 and the refrigerating compartment and freezing compartment fans 40, 50 are switched off with the counter of the number of times the compressor is activated with Tsr > Tar indicating a null value of times in which the appliance has been driven in this particular condition.
• the control means 30 promotes reading of the temperatures of the freezing compartment sensor Sf and refrigerating compartment sensor Sr and subsequently compares the value of the temperature Tsr sensed in the refrigerating compartment R with the sum of the activation temperature Tar of the refrigerating compartment fan 40 with the temperature difference between the temperature values Tsr sensed in the refrigerating compartment R and the activation temperature Tar of the refrigerating compartment fan 40. In case the comparison above indicates a temperature Tsr higher than or equal to said sum, the control means 30 instructs the refrigerating compartment and freezing compartment fans 40, 50 to operate, maintaining the compressor still switched off.
• the working speed of the refrigerating compartment fan 40 is established in the value of the last speed applied thereto or in the value of a default speed.
• the control means 30 compares the values of the temperature Tsf of the freezing compartment F with the activation temperature Taf of the freezing compartment fan 50. If the temperature Tsf of the freezing compartment F is superior or equal to the value of said activation temperature Taf, the control means 30 instructs both the compressor 60 and the freezing compartment fan 50 to operate.
• the system returns to the step of comparing the values between the temperature Tsr of the refrigerating compartment R and the sum of the activation temperatures Tar of the refrigerating compartment fan 40 and the difference of the temperatures Tfr and Tar.
• the control system further instructs the control means 30 to pass to the step of comparing the temperatures Tsf of the freezing compartment F and the activation temperature Taf of the freezing compartment fan 50.
• the control means 30 verifies the temperature Tsr of the refrigerating compartment R is lower than the deactivation temperature Tdr of the refrigerating compartment fan 40, the control means 30 switches off the refrigerating compartment fan 40, and the control system returns to the previous step, in which the control means 30 instructs both the compressor 30 and the freezing compartment fan 50 to operate. If the temperature Tsr is higher than or equal to Tar, the control means 30 keeps the deactivation temperature Tdr of the refrigerating compartment fan 40 equal to the temperature Tdr originally established or set for the operation of the refrigeration appliance, and the control means 30 then instructs the refrigerating compartment fan 40 to operate .
• the control means 30 Upon occurring the operational situation described above, the control means 30 instructs the refrigerating compartment fan 40 to operate in the speed previously applied thereto or in the default speed established in the project. Then, the control means 30 verifies the dF/dR relation between the cooling ratios of the freezing compartment F and of the refrigerating compartment R, respectively. The control means 30 verifies the different conditions illustrated in the median block of figure 2a. Thus, considering the exemplary value of 10% for the balance value for said cooling ratios, if the dF/dR ratio is zero, the control means 30 raises the speed of the refrigerating compartment fan 40. If the dF/dR ratio is higher than zero and lower than or equal to 0.9, the control means 30 reduces the speed of the refrigerating compartment fan 40.
• the control means 30 maintains the speed of the refrigerating compartment fan 40 unaltered. If the dF/dR ratio is superior or equal to 1.1, the control means 30 raises the speed of said refrigerating compartment fan 40 and if said ratio is equal to the ratio resulting from a division by zero, the control means 30 will also maintain the speed of the refrigerating compartment fan 40 unaltered.
• the control means 30 verifies, in a subsequent step, whether the temperature Tsf of the freezing compartment F is lower than the deactivation temperature Tdf of the freezing compartment fan 50. In case said operational condition occurs, the control means 30 switches off the compressor 60 and checks whether the temperature Tsr of the refrigerating compartment R is superior or equal to the sum of the activation temperature Tar of the refrigerating compartment fan 40 with the difference between the temperatures Tsr and Tar. In case such condition does not occur, the control means 30 switches off the freezing compartment fan 50 and the refrigerating compartment fan 40, maintaining the deactivation temperature Tdr of the refrigerating compartment fan 40 equal to the temperature Tdr originally set for the refrigeration appliance and returns to the beginning of the control system operation.
• control means 30 verifies that the temperature Tsf of the freezing compartment F is higher than or equal to the deactivation temperature Tdf of the freezing compartment fan 50, it switches off the refrigerating compartment fan 40 and checks whether the temperature Tsr of the refrigerating compartment R is superior or equal to the activation temperature Tar of the refrigerating compartment fan 40. If the Tsr ⁇ Tar condition occurs, the control means 30 returns the system to the condition in which it promotes the operation of the refrigerating compartment fan 40, either in the previous speed or in the default speed.
• the control means 30 verifies whether the temperature of the refrigerating compartment R is lower than the deactivation temperature Tde of the refrigerating compartment fan 40. If this condition occurs, the control means 30 switches off both the refrigerating 40 and the freezing 50 fans and switches off the compressor 60, maintaining the deactivation temperature Tdr of the refrigerating compartment fan 40 equal to the original deactivation temperature Tdr of said fan, returning the control system to the step in which the control means 30 verifies whether the temperature Tsf of the freezing compartment F is lower than the deactivation temperature Tdf of the freezing compartment fan 50.
• control means detects a temperature Tsr of the refrigerating compartment R higher than or equal to the deactivation temperature Tdr of the refrigerating compartment fan 40, it will further verify whether the refrigerating compartment fan 40 is switched on. If said refrigerating compartment fan 40 is switched off, the control means 30 returns the process to said step of comparing the temperature Tsf of the freezing compartment F with the deactivation temperature Tdf of the freezing compartment fan 50. If the refrigerating compartment fan 40 is on, the control means 30 verifies whether the speed setting time of the refrigerating compartment fan 40 is superior or equal to the time interval Ta between successive speeds settings of said fan.
• control means 30 In case the comparison of said times does not occur, the control means 30 returns the control system to the step of comparing the temperature Tsf of the freezing compartment F with the deactivation temperature Tdf of the freezing compartment fan 50. If said speed setting time/time interval Ta relation occurs, the control means 30 returns the system to the step of verifying the relation between the cooling ratio Tf of the freezing compartment F and the cooling ratio Tr of the refrigerating compartment R.

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• 2004
  • 2004-05-04 BR BR0402013-8A patent/BRPI0402013A/pt not_active IP Right Cessation
• 2005
  • 2005-04-29 MX MXPA06012913A patent/MXPA06012913A/es unknown
  • 2005-04-29 WO PCT/BR2005/000066 patent/WO2005106358A2/en active Application Filing
  • 2005-04-29 EP EP05736440A patent/EP1756492A2/en not_active Withdrawn
  • 2005-04-29 US US11/568,650 patent/US20080034768A1/en not_active Abandoned
  • 2005-05-02 AR ARP050101736A patent/AR049041A1/es not_active Application Discontinuation

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