Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
  • B60H1/00—Heating, cooling or ventilating [HVAC] devices
  • B60H1/32—Cooling devices
  • B60H1/3204—Cooling devices using compression
  • B60H1/3205—Control means therefor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
  • B60H1/00—Heating, cooling or ventilating [HVAC] devices
  • B60H1/32—Cooling devices
  • B60H2001/3236—Cooling devices information from a variable is obtained
  • B60H2001/3238—Cooling devices information from a variable is obtained related to the operation of the compressor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B60—VEHICLES IN GENERAL
  • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
  • B60H1/00—Heating, cooling or ventilating [HVAC] devices
  • B60H1/32—Cooling devices
  • B60H2001/3269—Cooling devices output of a control signal
  • B60H2001/327—Cooling devices output of a control signal related to a compressing unit
  • B60H2001/3272—Cooling devices output of a control signal related to a compressing unit to control the revolving speed of a compressor

Definitions

• the present invention refers to a climatization system of a vehicle cabin comprising a variable capacity compressor and a controller, which consists of an electronic inverter.
• the controller acts in the cooling capacity of the compressor in relation to data of the thermal load obtained from the vehicle cabin and tension data obtained from the power feeding source.
• Air conditioners for automotive vehicles as for example, the ones in trucks, when present are provided with a compressor connected to the ve- hide engine through a pulley and an electromagnetic clutch.
• this clutch is acted upon allowing the transmission of the engine motion to the compressor making the cooling fluid to run through the cooling circuit installed in the truck.
• This type of air conditioning application is widely used in automotive vehicles and usu- ally works with a running engine. Therefore, when it is desired the cabin or the driver compartment to be climatized with the stopped vehicle, the engine must be kept on. This procedure causes a considerable spending of fuel and maintenance of the air conditioning system, besides the emission of pollutants, what contributes to air pollution. Aiming at overcoming these problems, several solutions have been developed with the objective at allowing the functioning of the air conditioning system even when the engine is turned off.
• the North-American document US 2006/0102333 discloses an air conditioning system for road or off-road vehicles which pro- vides a method for the operation during the functioning of the vehicle engine and even when the vehicle engine is turned off.
• this air conditioning system comprises two cooling circuits, one for the cabin and another for the sleeping compartment existing in the vehicle.
• the variable speed compressor is controlled by a specific engine.
• the present invention aims at providing a climatization system of a vehicle cabin provided with cooling capacity control carried out through the reading of the "electrical current" of the compressor, the system being fed by the batteries of the vehicle themselves what allows the system operation and the climatization of the cabin with the vehicle engine turned on as well as off.
• the invention has as its objective a climatization system of a vehicle cabin comprising a variable capacity compressor and a controller, the climatization system of a vehicle cabin being characterized by the fact that: (i) the control of the climatization of the vehicle cabin is performed by the variation of the capacity of the compressor in relation to the thermal load present in the vehicle cabin;
• the controller acts on the rotation of the compressor only in relation to measured data of electrical current behaviors of the compressor during the climatization of the vehicle cabin.
• Figure 1 a schematic view of a vehicle cabin
• Figure 2 a perspective view of climatization system of a vehicle cabin, object of the invention
• Figure 3 - a lower view of the single base of the climatization system of a vehicle cabin, object of the invention
• Figure 4 graphs of the relationship between the temperature of the inner part of the vehicle cabin, electrical current for the compressor feeding and of the compressor rotation by which it varies the capacity thereof in the climatization system of a vehicle cabin, object of the present invention.
• the climatization system 5 of a vehicle cabin 3 allows keeping the vehicle cabin 3 climatized, independently of the vehicle engine being on or not, that is, the climatization system stays on the vehicle engine being on or off.
• This climatization system 5 of a vehicle cabin 3 controls the cooling capacity through the reading of the electrical current of the compressor 1 , therefore, the system comprises a variable capacity compressor 1 and a controller 2, which can be an electronic inverter or frequency inverter, which acts on the cooling capacity of the compressor 1 , in relation to electrical current data obtained from the compressor 1 itself and in relation to at least one power feeding source 4, which consists on the battery originally installed in the vehicle. Therefore, the data obtained from the vehicle cabin consist on: thermal load data which are translated into electrical current and tension data (V) obtained from the battery(s).
• the climatization system 5 of a vehicle cabin 3 is mounted on a single base 6.
• the climatization system 5 of a vehicle cabin 3 comprises a variable capacity compressor 1 and a controller 2. Furthermore, this climatization system 5 comprises a double radius fan 18 with a passing axle with predefined speeds and a first and a second heat exchangers 16 and 17.
• the first heat exchanger 16, besides the low pressure side of the cooling circuit (evaporator), and one of the rotors 18a of the fan engine 18 remain insulated inside a thermally insulated box 9, cold box, which has an air inlet, which serves as air return from the cabin 13, and an air outlet which serves as air blowing for the cabin 12 (figure 3).
• All these components, including the piping which links the compressor 1 and heat exchangers 16, 17 are fixed onto a rigid base 6, which may be supported on the hatch 15 (figure 1 ) present in most trucks, or even in vehicles which are not provided with this hatch but which allow having an opening in the ceiling thereof for the installation of this climatization system.
• the controller 2 through algorithms electronically implemented, "analyses" the behavior of this current i ⁇ A > at the time so as to from there make a decision of when to raise or reduce the rotation of the compressor 1 (RPM), varying thus the cooling capacity of the system.
• This current i (A) is higher, or even increasing, at the instant in which the cooling system is turned on making the controller 2 to understand that more cooling capacity is necessary for the de- mand of thermal load present in the climatized environment and thus puts the compressor 1 to work at maximum rotation. In this condition the cooling capacity of the compressor 1 is maximal.
• the thermal load on the vehicle cabin 3 decreases, resulting from the reduction of the temperature (T) of the cabin, the evaporation pressure also decreases, reducing also the current i (A) .
• the controller 2 now understands that the thermal load decreased and that it may also reduce the rotation of the compressor 1 , as the demand for cooling capacity is now lower. It is clear, thus, why the climatization system of a vehicle cabin 3 with variable rotation compressor 1 is more efficient than constant rotation compressor systems; as there is and adjustment of the offer of cooling capacity in relation to the thermal load demand.
• This logic works while the current i (A) is decreasing, that is, the controller 2, perceives, at a time interval, that there was a variation (decrea- se) of the current i (A) and reduces the rotation of the compressor 1. This reduction of the rotation is carried out until a minimal rotation pre-adjusted by the manufacturer. If, during the decrease of the cabin temperature (T), for some reason the current i (A) keeps constant, that is, does not show a reduc- tion, the controller 2 will increase the rotation of the compressor 1 so that the climatized environment reaches the set point temperature required by the user.
• the set point temperature is selected by the user what can be carried out through a mechanical or electronic thermostat 22 placed at the air return to the evaporator 16, in such a way as to represent the average temperature of the cabin.
• the user only adjusts the turning off temperature T 0 , the on temperature T L equal to T 0 + ⁇ T, predefined by the manufacturer.
• This thermostat 22 is serially linked to the controller 2 and functions to communi- cate it that the compressor 1 may be turned off, as T 0 has been reached. Only the compressor 1 is turned off, the fan 18 remains on.
• the controller 2 monitors tension values (V) of the power feeding source or battery 4, stopping the compressor 1 from starting or turning the compressor 1 off if the tension (V) reaches a minimal value, preserving the battery 4 so that it has enough power to start the vehicle engine.
• the temperature control of the climatized environment is performed by the variation of the capacity of the compressor 1 in relation to the thermal load present in the cooled compartment, avoiding the use of sensors placed at the cooled compartment or at components of the climatization system 5 for control and setting of the ideal rotation for the functioning of the compressor 1.
• control system has been described running in cooling mode.
• this system may work also in ventilation mode, by a decision of the user.
• the compressor 1 is not turned on and theoretically the blowing temperature will be the same as the return temperature of the cooling system.
• the compressor 1 remains off and the fan speed 18 may be increased up to the maximal limit.
• the fan has some pre-defined speed stages, however, the speed of the fan is limited when the compressor is on so that there is not and excessive spending of the battery 4 charge.
• the use of the battery 4 originally installed in the vehicle allows keeping the climatization system 5 on and the vehicle cabin 3 climatized e- ven when the vehicle engine is off, for example, during stopping periods when the vehicle driver uses the vehicle cabin 3 as a sleeping compartment.
• the climatization system 5 of a vehicle cabin using the climatization system 5 or just the ventilation mode with the fan 18 may be used for vehicle cabins 3 of trucks as well of recreation vehicles such as trailers or motor homes, safe cars or any other vehicle provided with a closed cabin which may have its inner environment climatized.

Applications Claiming Priority (2)

Publications (1)

Family

ID=39712519

Family Applications (1)

Country Status (4)

Citations (3)

• 2007
  • 2007-06-01 BR BRPI0702537-8A patent/BRPI0702537A2/pt not_active IP Right Cessation
  • 2007-12-27 CN CNA2007101608635A patent/CN101315216A/zh active Pending
• 2008
  • 2008-05-27 AR ARP080102223A patent/AR066731A1/es unknown
  • 2008-05-30 WO PCT/BR2008/000155 patent/WO2008144869A1/en active Application Filing

Patent Citations (3)

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