JP2016121832A - On-vehicle refrigeration device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-vehicle refrigeration device that enables two stages or more of speed control, eliminates the necessity of dedicated pole number switching electric motor and pole number switching circuit and does not inhibit a nap in an operation in a standby mode.SOLUTION: An on-vehicle refrigeration device for cooling the interior by operating a refrigerating cycle by using an electric compressor 1 during traveling includes an inverter 6, a flow straightener 2, air blowers 12, 14, a control device 15 and a control panel 30. The control device 15 includes rotational frequency restriction means for restricting maximum rotational frequency of the electric compressor 1. The control device 15 includes: a normal operation mode; and a silent operation mode of operating the electric compressor 1 at lower rotational frequency than that of the normal operation mode. The rotational frequency restriction means comprising Steps S43, S63 restricts the maximum rotational frequency of the electric compressor 1 in the normal operation mode during traveling of a freezer car when the silent operation mode is ordered. Thus, this never inhibits a driver from taking a nap.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an in-vehicle refrigeration apparatus having a standby mode in which an electric compressor is driven by a commercial power source when the vehicle is stopped to cool the interior of the refrigerator.

  As an operation in the standby mode in the in-vehicle refrigeration apparatus, there is a system in which the in-vehicle refrigeration apparatus stopped in a specific yard operates a compressor using an electric motor driven by a commercial power source. This system generally operates at a constant compressor speed and cannot change the speed.

  An example of a control problem that cannot change the rotation speed is that if the rotation speed is set high, the noise will be loud, making it difficult to use at night or in residential areas, and conversely if it is set low, it will be frozen. There is a possibility of lack of capacity. In addition, since the required refrigeration system capacity differs between summer and winter, there is a possibility that the necessary capacity in summer will be insufficient or the capacity will be surplus in winter depending on the set rotation speed.

  In addition, when such a conventional standby mode operation system is changed to a system in which the number of revolutions of the compressor can be arbitrarily set, it is necessary to add many functional products, which increases the number of parts, weight, and cost. There is also.

  For example, Patent Document 1 is known as one that changes the rotational speed of a compressor. This Patent Document 1 is for reducing noise generated from a condenser or the like by switching the number of poles of a compressor driving motor during operation in a standby mode to switch from high speed to low speed in two stages. In Patent Document 1, the speed of the blower motor is also linked to the speed of the compressor driving motor.

  Moreover, in patent document 2, the electric compressor is driven through the inverter with the electric power of a battery. A commercial power source is connected to the battery via a rectifier.

JP-A-10-253175 JP 2000-283622 A

  In Patent Document 1, since the number of poles is switched, only two-stage speed control is possible. Further, a dedicated pole number switching motor is required, and a pole number switching circuit is required. When driving in the standby mode, the driver often takes a nap in the cabin. However, if the noise from the compressor or the like is large, the nap is hindered. In particular, this noise problem is significant in an in-vehicle refrigeration apparatus in which a noise source such as an electric compressor is disposed above or behind the driver.

  An object of the present invention is to obtain an in-vehicle refrigeration apparatus that can perform speed control exceeding two stages in operation in a standby mode and has few noise problems.

  Descriptions of patent documents listed as prior art can be introduced or incorporated by reference as explanations of technical elements described in this specification.

  In order to achieve the above object, the present invention employs the following technical means. That is, in the present invention, the refrigeration cycle is operated by the electric compressor (1) during traveling to cool the interior of the refrigerator. This in-vehicle refrigeration apparatus includes an inverter (6), a rectifier (2), a blower (12, 14), a control device (15), and a control panel (30). The inverter (6) drives the compressor of the electric compressor (1). The rectifier (2) is connected to the commercial power source (3) when the refrigeration vehicle is stopped, rectifies the alternating current of the commercial power source (3), and supplies it to the inverter (6). The blower (12, 14) blows cooling air to the refrigeration cycle. The control device (15) controls the rotation speed of the electric compressor (1) by controlling the inverter (6). The control panel (30) supplies an operation signal to the control device (15). The control device (15) includes a rotation speed regulating means for regulating the maximum rotation speed of the electric compressor (1). The control device (15) can implement a normal operation mode and a silent operation mode in which the electric compressor (1) is operated at a lower rotational speed than the normal operation mode. The rotation speed regulation means regulates the maximum rotation speed (Np) of the electric compressor (1) in the normal operation mode while the refrigerator is running to the silent rotation speed (Npm) when the silent operation mode is commanded. .

  In the present invention, the rotational speed regulating means regulates the maximum rotational speed (Np) of the electric compressor (1) in the normal operation mode when the refrigerator is traveling when the silent operation mode is commanded. The noise of the compressor (1) does not disturb the driver's nap. In addition, multi-stage speed control is possible using an inverter.

  In addition, the code | symbol in parentheses as described in a claim and said each means thru | or description is an example which shows the correspondence with the specific means as described in embodiment mentioned later easily, and limits the content of invention is not.

1 is an external view of a refrigerator truck according to a first embodiment of the present invention. It is explanatory drawing explaining the structure and electric wiring of the freezing system of the vehicle-mounted freezing apparatus in 1st Embodiment. It is a front view which shows the control panel of the vehicle-mounted refrigeration apparatus in 1st Embodiment. It is a flowchart which shows control of the vehicle-mounted freezing apparatus in 1st Embodiment. It is a characteristic view which shows transition of the compressor rotation speed of the vehicle-mounted refrigeration apparatus in 1st Embodiment. It is a flowchart which shows control of the vehicle-mounted freezing apparatus in 2nd Embodiment of this invention. It is a front view which shows the control panel of the vehicle-mounted freezing apparatus in 2nd Embodiment of this invention. It is a map which calculates a correction coefficient according to the outside temperature for using it for control of the in-vehicle refrigeration system in a 3rd embodiment of the present invention. It is a flowchart which shows the control which changes from the normal operation mode in the other embodiment of this invention to the silent operation mode.

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. In the case where a part of the configuration is described in each form, the other forms described above can be applied to the other parts of the configuration.

  Not only combinations of parts that clearly indicate that the combination is possible in each embodiment, but also the embodiments are partially combined even if they are not clearly specified unless there is a problem with the combination. It is also possible.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. In this 1st Embodiment, the conventional vehicle-mounted refrigeration apparatus which operates an exclusive compressor using an electric motor at the time of driving | operation in standby mode is improved.

  In the first embodiment, the fact that an electric compressor equipped with an inverter for controlling the rotational speed can be easily controlled. In the first embodiment, the user can freely change the compressor rotation speed (compressor rotation speed) using the inverter-mounted electric compressor.

  FIG. 1 shows a refrigeration vehicle used in the container refrigeration system of the first embodiment. This refrigeration vehicle includes a refrigeration apparatus 10 behind an occupant in a driving vehicle 10h. Furthermore, the container 100 is provided in the back.

  FIG. 2 shows the configuration of the equipment constituting the refrigeration cycle of the refrigeration apparatus 10. The electric compressor 1 in the refrigeration apparatus 10 is driven by the direct current output of the rectifier 2 that constitutes the direct current power supply device when the freezer is stopped and in the standby mode. Three-phase power from the commercial power supply 3 is supplied to the temporary side of the rectifier 2. An electrolytic capacitor 5 for removing ripples is connected to the secondary side of the rectifier 2 via an electrical contact 4 of a magnet switch. The magnetic contact 4 of the magnet switch is used to open the power supply when it is not necessary to supply power to the inverter 6.

  The refrigeration system of the refrigeration apparatus 10 includes a condenser blower 12 that blows air to the condenser 11 and an evaporator blower 14 that blows air to the evaporator 13. The control device 15, also called ECU, controls the electric compressor 1, the condenser blower 12, the evaporator blower 14, and the like. As shown in FIG. 2, the refrigeration apparatus 10 for cooling the interior of the container 100 is provided with a power generation apparatus 16 that is driven by a sub-engine different from a traveling engine that is a driving source of the vehicle. . The power generated by the power generation device 16 is supplied to an inverter or the like when the refrigeration vehicle is running. In the power generation device 16, a generator, a battery charged by the generator, a magnet switch, and the like are provided. The inverter 6 of the electric compressor 1 operates with electric power from the power generation device 16 when the refrigeration vehicle is running.

  The refrigeration apparatus 10 is used in a refrigeration vehicle that transports frozen food, fresh food, and the like on land. This refrigeration vehicle includes a cabin serving as a cab in the driving vehicle 10h. The driving vehicle 10h is provided with a traveling engine and is also called a trailer head. The driving vehicle 10h and the trailer 10t provided with the container 100 are connected to each other in a detachable manner. The refrigeration apparatus 10 and the power generation apparatus 16 are integrally configured and attached to the front side of the container 100. The trailer 10t is pulled by the driving vehicle 10h.

  As shown in FIG. 2, the refrigeration apparatus 10 includes a refrigerant circuit 21 configured in a closed circuit. The refrigerant circuit 21 includes a fixed capacity type electric compressor 1, an oil separator 25, a condenser 11, a receiver 22, a refrigeration valve 23, an expansion valve 24, an evaporator 13, and an accumulator 26 in a loop through a refrigerant pipe in order. It is a well-known one that is connected. Oil is returned from the oil separator 25 through the capillary to the outlet side of the accumulator. A condenser blower 12 is provided adjacent to the condenser 11, and an evaporator blower 14 is provided adjacent to the evaporator 13. A defrosting circuit is provided on the upstream side of the condenser 11 and the upstream side of the evaporator 13 via a defrosting valve 27. The refrigerant from the electric compressor 1 flows to the condenser 11 and dissipates heat to the outside air.

  The electric compressor 1 is a scroll type compressor. The condenser blower 12 takes outside air outside the container 100 into the condenser 11. The evaporator blower 14 takes the air in the container 100 into the evaporator 13.

  The refrigerant circuit 21 constitutes a vapor compression refrigeration cycle by circulating the refrigerant. That is, in the refrigerant circuit 21, the refrigerant discharged from the electric compressor 1 is condensed by exchanging heat with the outside air in the condenser 11, decompressed by the expansion valve 24, and then the inside air in the evaporator 13. Evaporates through heat exchange. Thereby, the air in a warehouse is cooled. Moreover, the rotation speed of the electric compressor 1 is controlled by the inverter 6 for driving the electric motor, and the refrigerant quantity is adjusted. This inverter 6 is a dedicated inverter for the electric compressor 1 and may be attached to the outer shell of the electric compressor 1. The power generation device 16 supplies the refrigeration apparatus 10 with two types of independent power, that is, 12 volt DC power and three-phase power, and drives the refrigeration apparatus 10.

  The power generation device 16 includes a power generation engine, also called a sub-engine, a generator, a battery, and an alternator. A battery is also needed to start the engine. The DC power supply device that generates a DC output from the power of the engine in the power generation device 16 includes an alternator driven by the engine and a battery.

  The generator is mechanically connected to the engine. The generator generates three-phase electric power using engine power. The engine is dedicated to power generation provided separately from the driving engine of the driving vehicle. The battery is electrically connected to the alternator. The battery is charged with the DC power generated by the alternator and stores the DC power.

  The inverter 6 for driving the electric motor is electrically connected to the three-phase power terminal of the generator. The inverter 6 receives three-phase power from a generator. Then, the three-phase power is converted into a direct current and further converted into an alternating current power for driving the direct current brushless motor of the electric compressor 1. The inverter 6 outputs AC power for driving the DC brushless motor to the DC brushless motor described above. The DC brushless motor has no commutator and is driven by AC, but has the characteristics of a DC motor and is highly efficient.

  The electric power of the battery in the power generation device 16 is supplied to the electric motor of the condenser fan 12 via the contactor, and the condenser fan 12 rotates. Moreover, DC power is supplied from the battery to the electric motor of the evaporator blower 14 via the contactor, and the evaporator blower 14 rotates.

  The ECU constituting the control device 15 controls the inverter 6 and the like. DC power of the battery is input to the control device 15.

  In the present embodiment, the output power of the inverter 6 is regarded as the refrigeration load of the refrigeration apparatus 10. The inverter 6 converts three-phase power and applies it to the DC brushless motor of the electric compressor 1, and speed-controls the electric compressor 1 using this DC brushless motor within a range of about 1300 rpm to 8000 rpm. As a result, the control device 15 controls the refrigerant flow rate discharged from the electric compressor 1 based on the size of the refrigeration load of the in-vehicle refrigeration device.

  The control device 15 compares the set temperature with the internal temperature, and the control device 15 turns the contactor on and off as necessary, and drives the inverter 6 for driving the motor, the electric compressor 1, the condenser blower 12, and The evaporator blower 14 is operated to keep the internal temperature at the target temperature. Since the electric motor that drives the evaporator blower 14 has a function of circulating the air into the cabinet, it needs to be controlled separately from the load of the refrigeration apparatus of the electric compressor 1. Therefore, the evaporator blower 14 is controlled independently by being supplied with power from a battery, not a generator.

  FIG. 3 shows the control panel 30 operated by the driver. The control panel 30 is disposed in the cab or in the refrigeration apparatus 10. The control panel 30 is provided with switch means 45 composed of push button switches for instructing operation in the silent operation mode. When the switch means 45 is pressed, the internal lamp lights up and the word “silent” emerges. In FIG. 3, the control panel 30 is provided with an operation switch 31 and a display 3d for a refrigerator car on the front side. The operation switch 31 is an operation switch that issues an ON / OFF command for the refrigeration apparatus. In the display 3d, the cargo compartment is divided into the front and rear and right and left of the icon of the freezer car, and the luggage parts 34 and 35 of the freezer located on the left and right of the front side are frozen by the operation of the refrigerator, or the refrigerator is stopped Indicates that it is not frozen. In addition, it is shown that no luggage is loaded in the refrigerator compartment 36 on the rear side.

  Moreover, the set temperature display 37 of the freezer compartment is minus 20 ° C., and the current temperature display 38 is 20 ° C. Furthermore, it is displayed that the refrigerator compartment set temperature display is 3 ° C. and the current temperature display is 20 ° C. On the right side of the up / down switch 39, a setting switch 41, a defrosting switch 42 for starting defrosting manually, and a display mode changeover switch 43 are provided.

  FIG. 4 shows a part of the control of the rotational speed of the electric compressor 1 of the refrigeration apparatus 10. In FIG. 4, the control starts when the refrigerated vehicle stops at a specific yard and is connected to the commercial power source 3 to enter the standby mode. In step S41, control in the same normal operation mode as during traveling is continued.

  Next, in step S42, it is determined whether or not the user has operated the switch means 45 to change the rotational speed of the electric compressor 1 on the control panel 30. When the operation of changing the rotation speed of the electric compressor 1 is performed, the process proceeds to step S43, and the highest rotation speed of the electric compressor 1 after the change is determined. This change in the maximum rotational speed is determined by multiplying the maximum rotational speed during control in the normal operation mode by 0.7 which is 70%.

  For example, if the maximum rotation speed in the normal operation mode is 8000 rpm, the changed rotation speed is determined to be 5600 rpm. Therefore, thereafter, as in step S44, the maximum rotational speed of the electric compressor 1 does not exceed 5600 rpm. In step S42, when there is no operation for changing the rotational speed, the process returns to the normal operation in step S45.

  In addition, the minimum rotation speed of the electric compressor 1 when the refrigerating apparatus 10 is operated is set to a value at which oil in the refrigerant circulates and returns.

  FIG. 5 is a characteristic diagram showing the transition of the rotational speed for explaining the above operation. During normal operation, since the deviation between the internal temperature and the target temperature is large at the beginning of the operation, the rotational speed of the electric compressor 1 increases to the maximum rotational speed Np, and the rotation is stabilized as the internal cooling is performed. Converge on numbers. This maximum rotation speed Np is regulated by the power supply capacity of the commercial power supply 3.

  There is a change in the maximum rotation speed Np. For example, when the maximum rotation speed after the change is determined as 5600 rpm as the silent rotation speed Npm, the rotation speed of the electric compressor 1 does not exceed 5600 rpm. Therefore, it reaches a peak at the silent rotation speed Npm as indicated by an arrow Y5. When the standby mode is entered, the inside of the refrigerator is cooled by the normal operation during traveling so far, and it is sufficient to keep it cool or to cool it over time. Therefore, even if the change of the maximum rotation speed Np is determined by multiplying the rotation speed at the time of control in the normal operation mode by 0.7 which is 70%, the quality of the product in the warehouse is not deteriorated. Thereby, the rotation speed of the electric compressor 1 does not increase extremely, and the noise from the refrigeration apparatus 10 located behind the passenger who takes a nap in the cabin can be suppressed.

(Operational effects of the first embodiment)
The operational effects in the first embodiment are summarized as follows. In the first embodiment, the refrigeration cycle is operated by the electric compressor 1 while the refrigeration vehicle is traveling to cool the interior of the refrigerator. This refrigeration apparatus includes an inverter 6, a rectifier 2, blowers 12 and 14, a control device 15, and a control panel 30.

  The rectifier 2 is connected to the commercial power source 3 when the refrigeration vehicle is stopped, rectifies the alternating current of the commercial power source 3, and supplies it to the inverter 6. The blowers 12 and 14 blow cooling air to the condenser 11 and the evaporator 13 constituting the refrigeration cycle. The control device 15 controls the inverter 6 to control the rotation speed of the electric compressor 1. The control device 15 is connected to the control panel 30. An operation signal is supplied from the control panel 30 to the control device 15. The control device 15 can implement a normal operation mode and a silent operation mode in which the electric compressor 1 is operated at a maximum rotational speed lower than the normal operation mode. This silent operation mode can be implemented when the refrigerator is connected to the commercial power supply 3 and is operating in the standby mode.

  The control device 15 includes a rotation speed restricting means including step S43 in FIG. This means is that after the maximum rotational speed Np of the electric compressor 1 in the normal operation mode is changed when the operation in the standby mode is determined as YES in Step S42 of FIG. 4 and the silent operation mode is instructed. The silent rotation speed is limited to Npm.

  According to this, when the silent operation mode is commanded during the operation in the standby mode, the maximum rotational speed is reduced, and the maximum rotational speed of the electric compressor is suppressed to the low maximum rotational speed, so that the noise is reduced. Does not interfere with the nap in the cabin. In addition, noise to the dwellings around the yard is reduced.

  Then, when the silent operation mode is instructed from the control panel 30, the rotation speed regulating means consisting of step S <b> 43 has a silent rotation speed with a predetermined ratio value of 90 to 50 percent with respect to the rotation speed in the normal operation mode. Npm is determined. Thereby, control is performed so that the rotation speed of the electric compressor 1 does not exceed the silent rotation speed Npm.

  In the first embodiment, it is set to 70%, but it is not fixed to this, and can be adjusted within a range of 90 to 50 percent depending on the type of luggage and freezer in the container 100. Further, in step S43, when the silent operation mode is set, the maximum rotational speed of the blower 12, which is the maximum rotational speed of the fans 12, 14, may be reduced to 70% of the normal operation. In this way, noise is reduced by reducing the maximum rotational speed of the blower. In particular, in the refrigeration apparatus 10 in which the electric compressor 1 and the fans 12 and 14 are provided at the upper part or behind the occupant, there is a significant effect in reducing napping disturbance due to noise. Further, since the inverter 6 is used, a dedicated pole number switching motor and a pole number switching circuit are not required.

(Second Embodiment)
Next, a second embodiment of the present invention will be described. In the following embodiments, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof will be omitted, and different configurations will be described. In addition, about 2nd Embodiment or less, the same code | symbol as 1st Embodiment shows the same structure, The previous description is used.

  FIG. 6 shows part of the control of the rotational speed of the electric compressor 1 of the refrigeration apparatus 10 according to the second embodiment of the present invention. In FIG. 6, the control starts when the refrigerated vehicle stops at a specific yard and is connected to the commercial power source 3 to enter the standby mode. Initially, control in the same normal operation mode as that during traveling is continued as in step S61.

  Next, in step S <b> 62, it is determined whether or not the user has performed an operation for changing the rotational speed of the electric compressor 1 on the control panel 30. When the operation for changing the rotation speed of the electric compressor 1 is performed, the process proceeds to step S63, and the highest rotation speed of the electric compressor 1 after the change is determined as the silent rotation speed Npm. The change in the maximum rotational speed is determined to be 5000 rpm regardless of the rotational speed at the time of control in the normal operation mode. Therefore, after that, the rotational speed of the electric compressor 1 does not exceed 5000 rpm, and the operation is performed as in step S64. In conjunction with this, the maximum rotational speed of the blowers 12 and 14 may be lowered to a predetermined value. In step S62, when there is no operation for changing the rotation speed, or when it is not 5000 rpm or more in step S63, the operation returns to the normal operation in step S65.

  The above operation will be described with reference to FIG. During normal operation, since the deviation between the internal temperature and the target temperature is large at the beginning of operation, the rotational speed of the electric compressor 1 increases to the maximum rotational speed Np, and the rotational speed increases with cooling in the internal storage. Calm down. This maximum rotation speed Np is regulated by the power capacity of the commercial power source 3, for example, the rated current of the fuse.

  When the maximum number of revolutions is changed and is determined to be 5000 rpm, the number of revolutions of the electric compressor 1 does not exceed 5000 rpm. When the standby mode is entered, the inside of the refrigerator is cooled by the normal operation during traveling so far, and it is sufficient to keep it cool or to cool it over time. Therefore, even if the maximum number of rotations is changed to 5000 rpm, the quality of the product in the warehouse is not deteriorated. Thereby, the rotation speed of the electric compressor 1 does not increase extremely, and noise from behind the passenger who takes a nap in the cabin can be suppressed.

  Since the electric compressor 1 is a constant capacity type, the higher the number of revolutions, the greater the refrigerant discharge amount and the greater the refrigeration capacity. Note that a variable capacity electric compressor 1 can also be used. In this case, the compressor capacity control and the motor driving inverter 6 are controlled by a control signal from the control device 15.

(Operational effect of the second embodiment)
In the second embodiment, when the silent operation mode is instructed from the control panel 30 shown in FIG. 7, the rotation speed restricting means including step S63 in FIG. 6 is previously set in place of the rotation speed in the normal operation mode. The determined predetermined rotational speed is read from the storage means. And it controls so that the rotation speed of the electric compressor 1 does not exceed predetermined rotation speed. In the second embodiment, the rotation speed is fixed at 5000 rpm. However, the maximum rotation speed value stored in the storage unit in advance may be set within a range of 90 to 50 percent of the maximum rotation speed value when not regulated. In addition, the set value can be changed at any time.

(Third embodiment)
Next, a third embodiment of the present invention will be described. In the third embodiment, when the control for driving the compressor at a silent rotation speed lower than the normal rotation speed is selected, the rotation speed of the compressor is corrected according to the outside air temperature. FIG. 8 is a map for calculating a correction coefficient according to the outside air temperature. When the outside air temperature reaches 40 ° C., the correction coefficient becomes 1.5, and the silent rotation speed, which is the maximum rotation speed of the silent operation in the standby mode, is obtained by multiplying the determined temporary silent rotation speed by this correction coefficient. It is corrected to Npm.

  Therefore, when the standby mode is entered at 28 ° C. and the silent operation is instructed, the maximum rotational speed of the electric compressor 1 that has been operated at the maximum rotational speed of 5000 rpm is 5000 × 1.5, which is 7500 rpm. Is done. Accordingly, the internal temperature is rapidly cooled, the deviation between the internal temperature and the target temperature is rapidly reduced, and the quality of the internal product is not impaired. This correction is started when the outside air temperature reaches 28 ° C.

(Operational effect of the third embodiment)
In the third embodiment, information from the sensor 32 that detects the outside air temperature that detects the outside air temperature is input to the control device 15. The control device 15 corrects the maximum rotational speed in the silent operation mode according to the outside air temperature. According to this, since the maximum rotation speed can be set higher as the outside air temperature is higher, an unexpected increase in the internal temperature can be suppressed.

(Other embodiments)
In the above embodiment, the preferred embodiment of the present invention has been described. However, the present invention is not limited to the above embodiment, and various modifications can be made without departing from the gist of the present invention. It is. The structure of the said embodiment is an illustration to the last, Comprising: The scope of the present invention is not limited to the range of these description. The scope of the present invention is indicated by the description of the scope of claims, and further includes meanings equivalent to the description of the scope of claims and all modifications within the scope.

  In the above embodiment, the refrigeration vehicle constituting the container refrigeration system mounted on the trailer 10t has been described. However, the present invention can also be applied to a refrigeration vehicle mounted on a truck and constituting a refrigeration system. In the refrigeration system mounted on the truck, a noise source including an electric compressor and a blower is disposed above the driver (above the ceiling). The control panel is provided in the cab.

  In the first embodiment, the voltage of the commercial power supply 3 is 200 volts, but may be 400 volts. The control device 15 has a normal operation mode and a silent operation mode in which the electric motor is operated at a lower rotational speed than the normal operation mode. However, the present invention is not limited to these modes, and there may be other modes. For example, there may be an electric compressor high-rotation mode that places importance on cooling in the cabinet. This high-speed mode of the electric compressor is also called a capability priority mode, and is a mode in which the rotation speed of the electric compressor is maximized to the maximum when the user needs rapid cooling, and the capacity of the refrigeration apparatus is fully exhibited.

  On the other hand, the normal operation mode is also referred to as a normal mode, and is a mode that maintains a conventional refrigeration capacity. The silent operation mode is also called a silent mode, and is basically a mode for suppressing noise by lowering the number of revolutions of the electric compressor 1 when cooling at night or in a residential area.

  In order to change the mode, switch means 44 for instructing the normal mode and switch means 45 for instructing the silent operation mode may be added as shown in FIG. However, the changeover switch 43, the up / down switch 39, and the setting switch 41 in the control panel 30 may be used to confirm the mode displayed on the screen without adding a dedicated switch.

  During the operation in the standby mode, the control device presses the silent switch written as silent, or displays the silent mode on the display 3d by operating the setting switch or the changeover switch, and presses the decision operation switch. Operation mode can be commanded. Alternatively, the silent operation mode may be instructed by operating a switch written as nap. In this case, the operation of the air conditioner ECU 40 shown in FIG. 2 that receives a signal from the control device 15 or the control panel 30 may be adjusted to take a nap, raise the room temperature slightly, and lower the air blowing speed in the vehicle interior.

When the silent operation mode is instructed from the control panel 30, the rotation speed regulating means determines the silent rotation speed at a ratio of 90 to 50%, preferably 80 to 60% with respect to the rotation speed in the normal operation mode. . As a result, the maximum rotational speed of the electric compressor 1 is prevented from exceeding the silent rotational speed, but an instantaneous excess within 2 seconds may be allowed. In short, it is only necessary that the maximum rotational speed of the electric compressor 1 does not substantially exceed the silent rotational speed.

  Outside air temperature sensor information from a sensor 32 or the like that detects the outside air temperature is input to the control device 15. The control device 15 corrects the maximum number of revolutions in the silent operation mode according to the outside air temperature. However, the correction coefficient may be obtained from the map in consideration of both the outside air temperature and the amount of solar radiation. Furthermore, it is only necessary to correct as a result, and the correction is not limited to the one in which the correction coefficient is obtained once. You may calculate the corrected maximum rotation speed. That is, it is only necessary to determine the silent rotation speed (Npm) based on the outside air temperature. Note that, when constant power control is performed in which the power consumption of the electric compressor is limited and the electric compressor is operated below a predetermined power consumption, the constant power control is given priority over the compressor rotation speed control.

  The switch means for instructing the operation in the silent operation mode may be a switch means that is turned on when it is selected and set using the touch switch on the screen, the changeover switch 43, the setting switch 41, or the up / down switch 39. . Further, although the noise source such as the electric compressor 1 and the blowers 12 and 14 is applied to the refrigeration vehicle provided behind the occupant, the present invention is not limited to this.

  As shown in FIG. 9, when the commercial power source 3 is connected to the rectifier 2 in step S92 during normal operation while the vehicle is stopped in step S91, the normal operation mode is automatically changed to the silent operation mode in step S93. Also good. Thus, by providing the control device 15 with the automatic mode command means comprising the steps S92 and S93 for instructing the operation in the silent operation mode when the commercial power supply 3 is connected to the rectifier 2, the silent operation mode without troublesome operation is provided. Can be set.

  To return from the silent operation mode to the normal operation mode after the silent operation mode is selected, the following operation may be performed. It is only necessary to return from the standby mode when power supply from the commercial power supply is stopped or when the user presses the silent operation mode switch again. In addition, even when the deviation between the target temperature and the internal temperature becomes larger than a predetermined deviation, the silent operation mode may be canceled to return to the normal operation mode. The up / down switch of the control panel may be a dial switch that increases or decreases the rotational speed of the electric compressor 1 by rotating.

DESCRIPTION OF SYMBOLS 1 Electric compressor 2 Rectifier 3 Commercial power supply 6 Inverter 12, 14 Blower 15 Control apparatus 30 Control panel Np Maximum rotational speed Npm Maximum speed | rate which was controlled S43, S63 Step which comprises rotational speed control means

Claims (10)

In the in-vehicle refrigeration system that operates the refrigeration cycle by the electric compressor (1) while the refrigeration vehicle is running and cools the interior of the refrigerator,
An inverter (6) for driving the compressor of the electric compressor (1);
A rectifier (2) to which a commercial power source (3) is connected when the refrigerated vehicle is stopped, rectifies the alternating current of the commercial power source (3) and supplies the rectified vehicle to the inverter (6);
Blowers (12, 14) for blowing cooling air to the refrigeration cycle;
A control device (15) for controlling the inverter (6) to control the rotational speed of the electric compressor (1);
A control panel (30) for supplying an operation signal to the control device (15),
The control device (15) can perform a normal operation mode and a silent operation mode in which the electric compressor (1) is operated at a lower rotational speed than the normal operation mode,
When the silent operation mode is commanded, the control device (15) sets the electric drive speed to a silent rotation speed (Npm) smaller than the maximum rotation speed (Np) of the electric compressor (1) in the normal operation mode. A vehicle-mounted refrigeration apparatus comprising rotation speed regulating means for regulating the rotation speed of the compressor (1).   The rotation speed regulating means sets the silent rotation speed (Npm) to a ratio value of 90 to 50 percent with respect to the maximum rotation speed in the normal operation mode when the silent operation mode is entered. The in-vehicle refrigeration apparatus according to claim 1.   The rotation speed regulating means reads a predetermined silent rotation speed (Npm) determined in advance from the storage means instead of the rotation speed in the normal operation mode when the silent operation mode is entered, and the electric compressor 2. The in-vehicle refrigeration apparatus according to claim 1, wherein control is performed so that the rotational speed of (1) does not exceed the read silent rotational speed (Npm).   The in-vehicle refrigeration apparatus according to claim 2 or 3, wherein the refrigerator is connected to the commercial power supply (3) and is in the silent operation mode during operation in a standby mode. Information from the sensor (32) for detecting the outside air temperature, which is the outside air temperature, is input to the control device (15),
The in-vehicle refrigeration apparatus according to claim 1, wherein the control device (15) determines the silent rotation speed (Npm) using the outside air temperature. Information from the sensor (32) for detecting the outside air temperature, which is the outside air temperature, is input to the control device (15),
The control device (15) corrects the silent rotation speed (Npm) based on the outside air temperature, and controls the rotation speed of the electric compressor (1) with the corrected value. Item 4. The in-vehicle refrigeration apparatus according to Item 2 or 3.   The in-vehicle refrigeration apparatus according to any one of claims 1 to 6, wherein the control panel (30) is provided with switch means (45) for commanding operation in the silent operation mode. .   The control device (15) is provided with automatic mode command means for commanding operation in the silent operation mode when the commercial power source (3) is connected to the rectifier (2). The in-vehicle refrigeration apparatus according to any one of claims 1 to 6.   The in-vehicle refrigeration apparatus according to claim 2 or 3, wherein the control device regulates the maximum rotational speed of the blower (12, 14) when the silent operation mode is set.   The said electric compressor (1) and the said air blower (12, 14) are provided in the upper part or back of the passenger | crew who drive | operates the said freezing vehicle, It is any one of Claim 1 to 9 characterized by the above-mentioned. In-vehicle refrigeration equipment.

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