JP2016164465A - Drive control device of refrigeration device and control method of the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a drive control device for a refrigeration device capable of performing load reduction processing of a generator more efficiently, while maintaining refrigeration capacity of the refrigeration device at a desired level.SOLUTION: A drive control device 40 of a refrigeration device performs first processing for stopping a part of or all of a condenser fan F1, and second processing for stopping only a part of an evaporator fan F2, when a power generation amount of a generator 20 becomes lower than a predetermined threshold value V1. The drive control device 40, in the case where the power generation amount of the generator 20 after the second processing has not reached the predetermined threshold value V1, further performs third processing for reducing rotational frequency of a compressor 2 more than before. In the case where the power generation amount of the generator 20 after the third processing does not reach a threshold value V2 necessary for a continuous operation of the compressor 2, fourth processing for stopping the compressor 2 is performed, and in the case where the power generation amount of the generator 20 has reached the threshold value V2, the compressor 2 is allowed to perform the continuous operation.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a drive control device for a refrigeration apparatus, and more particularly to a drive control apparatus for a transport refrigeration apparatus, which can efficiently perform a load reduction process of a generator.

  In order to transport an object to be transported in a refrigerated / frozen state, a transport refrigeration apparatus is frequently used. Such a transport refrigeration apparatus is provided in moving means such as a vehicle, and has a cold storage for storing a transport object. As a refrigeration apparatus that cools the cool box, an electric compressor that compresses the refrigerant (hereinafter sometimes simply referred to as “compressor”), a generator that generates electric power for driving the compressor, and an internal heat exchanger There are some which are provided with an evaporator, an evaporator fan that sends cold air from the evaporator into the cabinet, a condenser that is an external heat exchanger, and a condenser fan that blows air to the condenser. Usually, in the case of a transport refrigeration system, the generator is driven by a traveling engine or a dedicated engine.

The generator may transiently become deficient in rotational speed due to an engine intake system failure, such as an engine carburetor clogging or a gasoline injection nozzle clogging. When the power generation amount of the generator decreases, the inverter that drives the compressor tries to flow a current corresponding to the inverter, so that the overcurrent protection of the inverter is activated and the compressor is stopped.
When the compressor is temporarily stopped in this way, the generator is locked even if an attempt is made to restart immediately after the stop, and it cannot be actually restarted unless a predetermined time has elapsed. A so-called restart delay occurs. Therefore, when the compressor is stopped by overcurrent protection of the inverter, it takes time to reach the target rotational speed of the compressor again. As a result, there is a problem that the refrigeration capacity (or air conditioning capacity) of the refrigeration apparatus is reduced.

JP 2004-123022 A

  In order to detect a decrease in the amount of power generation, the AC voltage output from the generator or the DC voltage obtained by rectification in the power conversion circuit is detected, and when the voltage falls below a certain threshold, the compressor speed is gradually reduced. There is also a way to make it. However, since it takes time to change the rotation speed of the compressor, this method has a problem that the load on the generator cannot be reduced in time, and as a result, the overcurrent protection of the inverter is activated.

Patent Document 1 discloses a vehicle equipped with a control unit that stops the compressor and intermittently operates the evaporator fan when it is determined that the supply power to the compressor should be suppressed due to a decrease in the power that can be supplied. A refrigeration system is proposed. Patent Document 1 also proposes that the condenser fan is stopped together with the compressor, and a part of the electric power generated in the generator is stored in the battery while these are stopped.
However, all of the proposals in Patent Document 1 are load reduction processing based on the premise that the compressor is stopped, and it takes more time to make the compressor reach the target rotational speed again after restarting. It is desirable to reduce the load on the generator.
The present invention has been made based on such a problem, and a drive control device for a refrigeration apparatus capable of performing load reduction processing of a generator more efficiently while maintaining the refrigeration capacity of the refrigeration apparatus at a desired level, and An object is to provide a control method thereof.

For this purpose, the drive control device for the refrigeration system of the present invention (hereinafter sometimes simply referred to as “drive control device”) avoids compressor stop as much as possible by performing load reduction processing of the generator in stages. The basic configuration includes a compressor that compresses the refrigerant, a generator that generates electric power for driving the compressor, and an internal heat exchanger provided in the cool box. A certain evaporator, a condenser that is an external heat exchanger provided outside the cool box, a plurality of condenser fans that are arranged near the condenser and blown to the condenser, and a cooler that is placed in the cool box and cools from the evaporator into the cool box. And a plurality of evaporator fans for sending out the air.
The drive control device includes a first process for stopping part or all of the condenser fan and a second part for stopping only a part of the evaporator fan when the power generation amount of the generator falls below a predetermined threshold value V1. Process.
The load reduction of the generator is not sufficient by the first process and the second process, and the drive control device determines that the power generation amount of the generator after the second process has not reached the threshold value V1. The drive control device further performs a third process for lowering the rotational speed of the compressor than before.
Then, even after the third process, if it is determined that the power generation amount of the generator has not reached the threshold value V2 necessary for the continuous operation of the compressor, the drive control device stops the compressor. Further processing is performed.
On the other hand, by performing the first process to the third process, the load on the generator is reduced, and as a result, when it is determined that the power generation amount of the generator has reached the threshold value V2, the drive control device Keeps the compressor running.
In the drive control device of the present invention, a process of stopping a part or all of the condenser fan and a part of the evaporator fan is adopted, so that the restart delay described above does not occur, and the load on the generator is reduced in a very short time. Can be reduced. Even if the power generation amount does not recover to the predetermined level after the first process to the third process and the fourth process for stopping the compressor is further performed, the inverter overcurrent Since the compressor can be stopped before the protection is activated, a restart delay can be avoided.

The implementation time of the load reduction process including the first process, the second process, and the third process can be, for example, less than 1 minute. By performing the load reduction process in a short time in this way, even when the power generation amount of the generator is reduced, it is possible to avoid the situation where the overcurrent protection of the inverter is activated and the compressor is stopped. it can.
The drive control device of the present invention is suitably used for a land transportation refrigeration system. As a vehicle on which the refrigeration system for land transportation is mounted, a gasoline vehicle equipped with a generator and a hybrid vehicle can be cited.
Moreover, the drive control apparatus of this invention is used suitably also for the refrigeration apparatus for sea transportation, for example, a sea container.

As a generator driving method, a refrigeration system further includes a method for obtaining driving force from a vehicle running engine or a generator dedicated engine for applying driving force to the generator, and the generator is driven from this dedicated engine. A method of obtaining power can be adopted. According to the latter, the generator can be stably driven even when the vehicle is involved in a traffic jam and the driving force from the traveling engine cannot be obtained sufficiently.
The processing performed by the drive control device described above can be obtained as a drive control method for the refrigeration apparatus.

ADVANTAGE OF THE INVENTION According to this invention, compared with the method of stopping the conventional compressor, the load reduction measure of the generator more effective can be provided. Therefore, even when the power generation amount of the generator suddenly decreases, the drive control device for the refrigeration apparatus can perform load reduction processing of the generator more efficiently while maintaining the refrigeration capacity of the refrigeration apparatus at a desired level. And a control method thereof.
According to the drive control device of the refrigeration apparatus of the present invention, it is difficult to cause a situation in which the transport object in the cool box is rotted while the compressor is stopped.

It is a block diagram which shows the structure of the refrigeration apparatus for land transport concerning 1st Embodiment. It is a figure which shows the flow of the process which the drive control apparatus of the refrigeration apparatus for land transport concerning 1st Embodiment performs.

Hereinafter, the present invention will be described in detail based on an embodiment shown in the accompanying drawings by taking a refrigeration apparatus for land transportation as an example.
[First Embodiment]
A land transportation refrigeration apparatus 1 according to a first embodiment will be described with reference to FIGS. 1 and 2.
The refrigeration apparatus 1 for land transportation is mounted on a vehicle that is equipped with the cold storage 7 and the refrigerant circuit 10 for cooling in the cold storage 7, that is, a freezer, and cools the cold storage 7. Examples of such refrigerated vehicles include small trucks, large trucks, and the like, and the cold storage 7 is loaded on the bed of these trucks.

  As shown in FIG. 1, the refrigerant circuit 10 compresses the refrigerant and discharges it as a high-pressure gas refrigerant, the condenser 3 that condenses and vaporizes the compressed refrigerant, and adiabatically expands the condensed refrigerant. It includes an electronic expansion valve 4, an evaporator 5 that evaporates and vaporizes the adiabatically expanded refrigerant, and a refrigerant pipe 6 that connects these devices. The evaporator 5 is an internal heat exchanger provided in the cool box 7, and the condenser 3 is an external heat exchanger provided outside the cool box 7. Other components of the refrigerant circuit 10, that is, the compressor 2, the electronic expansion valve 4, and the refrigerant pipe 6 are also arranged outside the cool box 7 as with the capacitor 3.

  The refrigeration vehicle in which the land transportation refrigeration apparatus 1 is installed includes a vehicle traveling engine E, a generator 20, a power conversion unit 30 disposed between the generator 20 and the compressor 2, and a plurality of A condenser fan F1, a plurality of evaporator fans F2, and a drive control device 40 are further provided. For simplification, only one condenser fan F1 and one evaporator fan F2 are shown in FIG.

The traveling engine E and the generator 20 are coupled via power transmission means (not shown) such as a belt and a gear mechanism. The generator 20 obtains a driving force from the traveling engine E through the power transmission means, and generates electric power for driving the compressor 2.
The power conversion unit 30 includes a rectifier circuit 31 that rectifies an AC voltage output from the generator 20 into a DC voltage, and an inverter circuit 32 that converts the DC voltage rectified by the rectifier circuit 31 into an AC voltage. The power supply destination switched in the power conversion unit 30 is the compressor 2, the condenser fan F1, and the evaporator fan F2.

The condenser fan F <b> 1 is disposed outside the cool box 7 and in the vicinity of the condenser 3 and blows air toward the condenser 3.
The evaporator fan F <b> 2 is disposed in the cool box 7 and in the vicinity of the evaporator 5, and sends out cooled air from the evaporator 5 into the cool box 7.

The number of the condenser fan F1 and the evaporator fan F2 can be appropriately set according to the size of the refrigerator car and the capacity of the compressor 2. For example, in the case of a small truck having a compressor with a cooling capacity of 3 kW, two condenser fans with a power consumption of 70 W and two evaporator fans with a power consumption of 95 W can be provided. For example, in the case of a large truck including a compressor with a cooling capacity of 6 to 8 kW, four condenser fans with a power consumption of 95 W and four evaporator fans with a power consumption of 95 W can be provided.
As the condenser fan F1 and the evaporator fan F2, it is possible to use a fan whose rotation speed is constant or a rotation speed variable fan whose rotation speed is variable continuously or stepwise.

  When the power generation amount of the generator 20 reaches the above-described threshold value V1 as a result of the load reduction process of the generator 20, the temporarily stopped condenser fan F1 and / or evaporator fan F2 may be returned to the on state. In the case of using a rotation speed variable fan as the fans F1 and F2, the rotation speed may be increased to a constant level continuously or stepwise when the fans F1 and F2 are returned to the on state. Thereby, the inching which repeats ON / OFF of fan F1, F2 frequently can be avoided.

  The drive control device 40 controls the operation of the power conversion unit 30, and also controls the operation of the condenser fan motor M1 built in the condenser fan F1 and the evaporator fan motor M2 built in the evaporator fan F2. Further, the drive control device 40 includes a switch S1 for turning on / off the power supply from the power conversion unit 30 to the condenser fan motor M1, and a switch S2 for turning on / off the power supply from the power conversion unit 30 to the evaporator fan F2. Control directly.

  Moreover, the drive control apparatus 40 determines whether the electric power generation amount of the generator 20 has reached threshold value V1, V2. For this determination, the drive control device 40 can acquire the engine speed from an engine speed detection sensor (not shown) provided in the traveling engine E, for example. Alternatively, whether the power generation amount of the generator 20 reaches the thresholds V1 and V2 by detecting the DC voltage rectified by the rectifier circuit 31 from a voltage detection sensor (not shown) provided on the rear stage side of the rectifier circuit 31. It can be determined whether or not. In terms of cost, the latter is more advantageous than the former.

The drive control device 40 includes an arithmetic processing unit and storage means (not shown). The storage means stores a predetermined threshold value V1 indicating the normal power generation amount of the generator 20 and a threshold value V2 indicating the power generation amount of the generator 20 that is the minimum necessary for continuous operation of the compressor 2. The threshold value V2 is referred to when there is an abnormality in which the power generation amount of the generator 20 is decreasing, and can be normally set as V1> V2, but may be V1 ≧ V2 or V1 = V2.
The threshold values V1 and V2 may be absolute values of the power generation amount, or may be a fluctuation amount within a predetermined time, that is, a slope.
In the storage means of the drive control device 40, in addition to the threshold values V1 and V2, data relating to the number and power consumption of each of the condenser fan F1 and the evaporator fan F2, and data in which the rotation speed and power consumption of the compressor 2 are associated with each other. Etc. are also stored.

Next, with reference to FIG. 2, the flow of the load reduction process performed by the drive control device 40 will be described. This control is always performed during the running operation of the refrigeration vehicle in which the refrigeration apparatus 1 for land transportation is installed,
It is automatically started after a predetermined time has elapsed since the start of the traveling engine E.
First, the compressor 2 is operated under a predetermined condition (step S1), and the power generation amount (voltage V) of the generator 20 is detected by the drive control device 40 (step S3).
Next, the drive control device 40 detects whether the power generation amount of the generator 20 has fallen below the threshold value V1, that is, the predetermined power generation amount of the generator 20, by detecting the engine speed or the DC voltage rectified by the rectifier circuit 31. Is determined (step S5). If it is determined that the power generation amount ≧ the threshold value V1, the process returns to step S1, and the compressor 2 is continuously operated under a predetermined condition without performing the load reduction process.
On the other hand, when it is determined in step S5 that the power generation amount <threshold value V1, the drive control device 40 stops some or all of the plurality of condenser fans F1 (step S7). For example, when the power generation amount is significantly below the threshold value V1 and the power generation amount is seriously reduced, the drive control device 40 can stop all of the plurality of capacitor fans F1. When the power generation amount is slightly below the threshold value V1 and the power generation amount decrease is not serious, a part of the plurality of condenser fans F1 can be stopped.
The drive control device 40 controls the capacitor fan F1 by directly controlling the switch S1 for turning on / off the power supply from the power conversion unit 30 to the capacitor fan motor M1 and the capacitor fan motor M1 built in the capacitor fan F1. It is possible to immediately switch from the on state to the off state. That is, since the drive control device 40 can directly stop part or all of the capacitor fan F1 without going through the power conversion unit 30, the time required for step S7 is only a few seconds, specifically 20 milliseconds. Degree.

Next, the drive control device 40 stops only a part of the plurality of evaporator fans F2, that is, partially stops (step S9). As described above, the evaporator fan F <b> 2 is arranged in the cool box 7 and sends out the cooled air from the evaporator 5 into the cool box 7. Compared with the condenser fan F1 arranged outside the cold storage box 7, the entire stop of the evaporator fan F2 arranged inside the cold box 7 has a great influence on the storage status of the transportation object in the cold box 7. That is, if the air in the cool box 7 is not circulated due to the complete stop of the evaporator fan F2, the temperature of the transportation object rises and the transportation object may be deteriorated or spoiled. In order to avoid such a situation, in the present invention, the condenser fan F1 is allowed to be completely stopped, while at least a part of the evaporator fan F2 is required to be operated.
The drive control device 40 directly controls the evaporator fan F2 by directly controlling the switch S2 for turning on / off the power supply from the power conversion unit 30 to the evaporator fan motor M2 and the evaporator fan motor M2 incorporated in the evaporator fan F2. It is possible to immediately switch from the on state to the off state. That is, since the drive control device 40 can directly stop a part of the evaporator fan F2 without going through the power conversion unit 30, the time required for step S9 is only a few seconds, specifically about 20 milliseconds. is there.

  Subsequently, the drive control device 40 determines whether or not the power generation amount of the generator 20 has fallen below the threshold value V1 by detecting the engine speed or the DC voltage rectified by the rectifier circuit 31 (step S11). The load on the generator 20 is reduced by the above-described steps S7 and S9. In step S11, it is determined whether or not the reduction degree is sufficient. As a result of the determination, if power generation amount ≧ threshold value V1, the process proceeds to step S13, the temporarily stopped condenser fan F1 and evaporator fan F2 are returned, and then the process returns to step S1 to continue the compressor 2.

On the other hand, when it is determined in step S11 that the power generation amount <threshold value V1, the drive control device 40 controls the inverter circuit 32 so as to reduce the rotational speed of the compressor 2 (step S15). Since the reduction in the rotational speed of the compressor 2 leads to a reduction in the load on the power conversion unit 30, this also reduces the load on the generator 20. The time required for step S15, that is, the time required for completing the rotation speed change of the compressor 2 is, for example, about 20 seconds to 40 seconds when the rotation speed is reduced by 40 Hz (120 Hz → 80 Hz).
As described above, since the storage unit of the drive control device 40 stores data in which the rotation speed of the compressor 2 and the power consumption are associated with each other, this data is referred to and the difference between the threshold value V1 and the power generation amount is stored. In consideration of the above, the drive control device 40 appropriately changes the rotational speed of the compressor 2 via the inverter circuit 32. For example, the rotation speed of the compressor 2 can be changed using a pulse width modulation method that generates an AC waveform by changing the pulse width of the voltage. In addition, it is preferable to previously determine the amount of reduction in the rotational speed of the compressor 2.

After step S15, the drive control device 40 detects the engine speed or the DC voltage rectified by the rectifier circuit 31 again, so that the power generation amount of the generator 20 is the minimum value for the threshold value V2, that is, the continuous operation of the compressor 2. It is determined whether or not the threshold value V2 indicating the power generation amount of the generator 20 that is necessary is reached (step S17). If it is determined in step S17 that the power generation amount <threshold value V2, the drive control device 40 stops the compressor 2 (step S19).
On the other hand, if power generation amount ≧ threshold value V2, the process returns to step S1 and the compressor 2 is continuously operated. Here, when it is determined Yes in step S17 and the compressor 2 is continuously operated, the compressor 2 is operated in a state where the rotational speed is lower than normal. In this case, when it is determined that the power generation amount ≧ threshold value V1 in step S5 described above after a predetermined time has elapsed (NO in step S5), the rotational speed of the compressor 2 may be gradually returned to a predetermined level.

The flow of the load reduction process performed by the drive control device 40 has been described with reference to FIG. According to the main part of the present invention in which the processes of steps S7, S9, and S15 are performed step by step, the load on the generator 20 can be reduced and the power generation amount can be restored while avoiding the stop of the compressor 2 as much as possible. .
Unless the process proceeds to step S19, the compressor 2 is continuously operated. Therefore, there is no restart delay caused by the conventional compressor stop. Since the required time when all the processes of steps S7, S9, and S15 are performed is less than 1 minute, more specifically, 40 seconds or less, compared with the restart delay (for example, 3 minutes) that has conventionally occurred, The load reduction process of the invention can reduce the load on the generator 20 in a very short time. Therefore, even when the power generation amount of the generator 20 suddenly decreases, the load reducing process of the generator 20 can be performed more efficiently while maintaining the refrigeration capacity of the refrigeration apparatus 1 for land transportation at a desired level. . As a result, according to the drive control device 40 of the present invention, a significant decrease in the refrigeration capacity can be avoided against a transient decrease in the amount of power generation in the freezer truck for land transportation. It is hard to invite the situation that the transport object of rot.

Further, since the drive control device 40 can directly stop part or all of the condenser fan F1 and part of the evaporator fan F2 without going through the power conversion unit 30, the load reduction processing in steps S7 and S9. Can be performed in a very short time of only about 20 milliseconds. Therefore, the load reduction process of the present invention has an immediate effect. Instead of the method of stopping the condenser fan F1 and the evaporator fan F2, the power consumption of the fans F1 and F2 is reduced by reducing the rotation speed while maintaining the on-state of these fans F1 and F2, and the load on the generator 20 A method of reducing the above is also considered.
However, according to the latter method, since the intervention of the inverter circuit 32 constituting the power conversion unit 30 is required, the time required for the processing becomes longer than that of the former method, and the effect of reducing the load on the generator 20 is achieved. Is smaller than the former. Therefore, in the present invention, the drive control device 40 is not directly connected to the part of the condenser fan F1 or through the power conversion unit 30 instead of reducing the rotational speed while maintaining the ON state of the fans F1 and F2. A method of stopping all and a part of the evaporator fan F2 is adopted.

When the power generation amount is restored to the threshold value V1 as a result of reducing the load on the generator 20, the condenser fan F1 and the evaporator fan F2 that have been once turned off can be turned on again (step S13). Since the drive control device 40 can directly perform the control for turning on the fans F1 and F2 in the off state without using the power conversion unit 30, the load reduction processing recommended by the present invention is for land transportation. The refrigerating apparatus 1 can also be quickly restored.
Even if the process of stopping the compressor 2 in step S19 is performed, the compressor 2 can be stopped before the overcurrent protection of the inverter circuit 32 is activated, thereby avoiding a restart delay. be able to.

  In addition, although the example which performs the process of step S7 which stops the condenser fan F1 partially or completely and step S9 which stops the evaporator fan F2 sequentially was shown, these steps S7 and S9 may be performed simultaneously. Further, although it is preferable to sequentially perform the processing of step S7 and step S9, the present invention allows step S9 to be performed prior to step S7.

[Modification]
In 1st Embodiment, the generator 20 obtained the driving force from the engine E for driving | running | working via a power transmission means, and showed the example which produces | generates the electric power which drives the compressor 2. As shown in FIG. As a modification, an example in which a dedicated engine dedicated to the generator 20 different from the traveling engine E is further provided will be described.
Note that, in a modified example employing a dedicated engine, the drive control device 40 can acquire the engine speed from an engine speed detection sensor provided in the dedicated engine. Or similarly to 1st Embodiment, the electric power generation amount of the generator 20 is detected by detecting the DC voltage which the rectifier circuit 31 rectified from the voltage detection sensor (not shown) provided in the back | latter stage side of the rectifier circuit 31. It can be determined whether or not a predetermined level has been reached.

  The generator 20 is connected not to the traveling engine E but to a dedicated engine. For example, there is a case where the refrigeration vehicle is caught in a traffic jam and the driving force from the traveling engine E cannot be obtained sufficiently. However, in the modified example, the generator 20 is driven by the dedicated engine, so the amount of power generation is refrigeration vehicle. There is an advantage that it is not affected by the running state of the vehicle. In addition, the refrigeration vehicle in which the refrigeration system 1 for land transportation is installed adopts an idling stop system, that is, a system that automatically turns off the engine when the vehicle is stopped waiting for a signal and restarts the engine when starting. In this case, it is preferable that a dedicated engine is mounted for stable driving of the generator 20.

In addition, such a dedicated engine usually includes a cooling water pump and a radiator fan as engine auxiliary equipment. Therefore, when the generator 20 is driven by the dedicated engine, in the process shown in FIG. 2, the cooling water pump is stopped or the radiator fan is turned on immediately after or after step S7 and S9 and immediately before or after step S11. A stop may be implemented. That is, by stopping the operation of parts that do not hinder the operation of the compressor 2, the generator 20 while avoiding the process of reducing the rotation speed of the compressor 2 in step S15 and the stop of the compressor 2 in step S19 as much as possible. You may make it reduce the load of.
According to the above-described modification, the same effect as described in the first embodiment can be obtained. Moreover, since the power generation amount of the generator 20 is not affected by the running state of the refrigerator car, there is an advantage that the generator 20 can be driven stably.

In the above embodiment, the land transportation refrigeration apparatus 1 has been described as an example, but the drive control apparatus 40 of the present invention can be similarly applied to a sea transportation refrigeration apparatus. Similarly to the refrigeration system 1 for land transportation, the refrigeration system for marine transportation is a compressor, a generator that generates electric power for driving the compressor, an evaporator that is an internal heat exchanger, a condenser that is an external heat exchanger, Equipped with multiple condenser fans that blow air to the condenser and multiple evaporator fans that send cold air from the evaporator into the cool box, efficiently reducing the load on the generator while maintaining the refrigeration capacity of the refrigeration system at the desired level It is because it is necessary to carry out.
Further, in the first embodiment, an example in which the generator 20 is coupled to the traveling engine E is shown, and an example in which the generator 20 is coupled to a dedicated engine is shown as a modified example. However, both the traveling engine E and the dedicated engine may be used. The refrigeration apparatus may further include a battery, and a surplus of the amount of power generated by the generator 20 may be stored in the battery so that power is supplied from the battery to the generator 20 in an emergency.

  Moreover, the load reduction process of this invention can be applied not only to the freezing vehicle provided with the cool box 7, but also to general vehicles other than the freezing vehicle equipped with in-vehicle air conditioning. That is, what is necessary is just to regard the cool box 7 shown in FIG. 1 as the interior space to be cooled. Even when food and drinks are brought into the vehicle interior or when it is difficult to cool during summer high temperatures, the load reduction processing of the present invention can be used to avoid the compressor from being stopped as much as possible. The comfort level can be kept at a certain level.

  Furthermore, the load reduction process of the present invention can also be applied to a gas heat pump type (GHP type) air conditioner that uses a gas engine as a drive source of the compressor. Such a GHP type air conditioner is different from the configuration shown in the first embodiment of the present application in that the power generator generates power by the power of the gas engine. However, like the refrigeration system 1 for land transportation, the GHP air conditioner also includes a compressor, a generator for generating electric power for driving the compressor, an evaporator, a condenser, a plurality of condenser fans, and a plurality of evaporator fans. In terms of being in agreement. By applying the load reduction process of the present invention to the GHP air conditioner, the load reduction process of the generator can be efficiently performed while maintaining the air conditioning capacity at a desired level.

  In addition to this, as long as it does not depart from the gist of the present invention, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate.

DESCRIPTION OF SYMBOLS 1 Refrigeration apparatus 2 for land transport Compressor 3 Capacitor 4 Electronic expansion valve 5 Evaporator 6 Refrigerant piping 7 Cold storage 10 Refrigerant circuit 20 Generator 30 Power conversion unit 31 Rectifier circuit 32 Inverter circuit 40 Drive controller E Driving engine M1 Condenser fan Motor M2 Evaporator fan Motor F1 Capacitor fan F2 Evaporator fan S1 Switch S2 Switch V1 Threshold value V2 Threshold value required for continued operation of the compressor

Claims (9)

A compressor that compresses the refrigerant, a generator that generates electric power for driving the compressor, an evaporator that is an internal heat exchanger provided in the cold storage, and an external heat exchanger that is provided outside the cold storage A capacitor, a plurality of condenser fans arranged in the vicinity of the condenser and blowing air to the condenser, and a plurality of evaporator fans arranged in the cool box and sending cold air from the evaporator into the cool box. A drive control device for a refrigeration apparatus comprising:
When the power generation amount of the generator falls below a predetermined threshold V1, the drive control device
A first process for stopping part or all of the condenser fan;
A second process of stopping only a part of the evaporator fan, and
The drive control device includes:
If it is determined that the power generation amount of the generator after the second process has not reached the threshold value V1, a third process for lowering the rotational speed of the compressor than before is further performed.
When it is determined that the power generation amount of the generator after the third process has not reached the threshold value V2 necessary for the continuous operation of the compressor, a fourth process for stopping the compressor is further performed. Do or
If it is determined that the power generation amount of the generator after the third process has reached the threshold value V2, the compressor is continuously operated.
The drive control apparatus of the freezing apparatus characterized by the above-mentioned. The execution time of the load reduction process including the first process, the second process, and the third process is less than 1 minute.
The drive control apparatus of the refrigeration apparatus of Claim 1. The refrigeration apparatus is a refrigeration apparatus for land transportation,
The drive control apparatus of the refrigeration apparatus of Claim 1 or 2. The generator is coupled to the vehicle running engine via power transmission means.
The drive control apparatus of the refrigeration apparatus of Claim 3. The refrigeration apparatus further includes a generator-dedicated engine that applies driving force to the generator.
The drive control apparatus of the refrigeration apparatus of Claim 3. The refrigeration apparatus is a marine transport refrigeration apparatus,
The drive control apparatus of the refrigeration apparatus of Claim 1 or 2. The refrigeration apparatus includes a power conversion unit between the generator and the compressor,
The power conversion unit includes a rectifier circuit that rectifies an AC voltage output from the generator into a DC voltage, and an inverter circuit that converts the DC voltage rectified by the rectifier circuit into an AC voltage,
The drive control device detects the DC voltage rectified by the rectifier circuit from a voltage detection sensor provided on the rear side of the rectifier circuit, whereby the power generation amount of the generator is set to the threshold value V1 and the threshold value V2. To determine whether or not
The drive control apparatus of the refrigeration apparatus of any one of Claim 1 to 6. A compressor that compresses the refrigerant, a generator that generates electric power for driving the compressor, an evaporator that is an internal heat exchanger provided in the cold storage, and an external heat exchanger that is provided outside the cold storage A capacitor, a plurality of condenser fans arranged in the vicinity of the condenser and blowing air to the condenser, and a plurality of evaporator fans arranged in the cool box and sending cold air from the evaporator into the cool box. A refrigeration apparatus drive control method comprising:
A first process for stopping part or all of the condenser fan when the power generation amount of the generator falls below a predetermined threshold value V1;
A second process of stopping only a part of the evaporator fan, and
When it is determined that the power generation amount of the generator after the second process has not reached the threshold value V1, a third process of lowering the rotation speed of the compressor than before is further performed.
If it is determined that the power generation amount of the generator after the third process has not reached the threshold value V2 necessary for the continuous operation of the compressor, a fourth process for stopping the compressor is further performed. Or
When it is determined that the power generation amount of the generator after the third processing has reached the threshold value V2, the compressor is continuously operated.
A drive control method for a refrigeration apparatus. The refrigeration apparatus is a refrigeration apparatus for land transportation,
The drive control method of the refrigeration apparatus according to claim 8.

Images