JP6615078B2 - Construction machinery - Google Patents

Description

  The present invention relates to a construction machine equipped with a storage battery.

  A hybrid excavator or a battery excavator that operates using a storage battery (for example, a lithium ion battery) as a power source includes a cooling means for the storage battery because the storage battery generates heat by charging and discharging. When the state exceeding the upper limit temperature (for example, 50 ° C.) continues, deterioration of the storage battery is accelerated and the life is reduced. Therefore, it is necessary to use the storage battery while cooling so as not to exceed the upper limit temperature. Furthermore, when the cooling cannot catch up with the heat generation of the storage battery, it is necessary to protect the storage battery by limiting the charge / discharge amount to suppress the heat generation.

  On the other hand, since the performance (output) of the storage battery falls below the lower limit temperature (for example, 10 ° C.), it is necessary to warm the storage battery in advance to ensure a sufficient power source even in a low temperature environment. is there.

  In the case of an automobile, the storage battery is often warmed up using the air in the in-car living space. However, in the case of construction machinery, the cab (operator's cab) is not necessarily equipped with an air conditioner, is often operated at construction sites, etc., and a large amount of dust is contained in the air. It is difficult to use air. As one method for warming up a battery mounted on a hybrid excavator, a method using engine cooling water is known (Patent Document 1).

  Patent Document 1 states that “a capacitor temperature adjusting circuit 13 for keeping the capacitor 6 at an appropriate temperature is connected to the engine cooling circuit 11 and the device cooling circuit 12. The capacitor temperature is detected by the capacitor temperature sensor 20, and the capacitor 6 is warmed up. In a situation requiring cooling, the controller 17 guides the engine cooling water, and in a situation requiring cooling, the cooling water in the equipment cooling circuit 12 is led to the capacitor 6 to warm up or cool it. And a configuration for controlling the cooling pump 14 ”(see summary).

JP2012-154092A

  In the system configuration of Patent Document 1, when the cooling both switching valves fail and cannot be switched, high-temperature (for example, 90 ° C.) cooling water continues to flow from the device cooling circuit into the condenser temperature adjustment circuit, so that the condenser becomes excessive. The temperature rises and the life of the battery may be significantly reduced. Therefore, when the cooling both switching valve breaks down, the operator can quickly take appropriate measures to protect the battery (for example, evacuate the hybrid excavator to a safe place, then stop the engine and wait for repair). Need to be done.

  However, in the configuration of Patent Document 1, since the failure of the cooling both switching valve cannot be detected, the operator cannot quickly take appropriate measures.

  The present invention has been made in view of the above problems, and an object thereof is a construction machine configured to circulate a part of high-temperature cooling water used for cooling a heat-generating device to warm up a power storage device. Therefore, it is intended to suppress a decrease in the life of the power storage device due to excessive warm-up by detecting a failure of the electromagnetic control valve that controls the flow rate of the cooling water circulating through the power storage device.

In order to solve the above problems, the present invention provides a first cooling that cools the heat generating device by circulating a refrigerant between the heat generating device and the first heat radiating device using a heat generating device and a first cooling pump. A system, a power storage device, and a branch from the first cooling system, and a part of the refrigerant is supplied to a heat exchange device provided adjacent to the power storage device to warm up the power storage device A warm-up system, an electromagnetic control valve provided on the upstream side of the heat exchange device of the warm-up system, a notification device provided in a cab, and a first unit for detecting a temperature of a predetermined part of the warm-up system The temperature detected by the first temperature detection device reaches after the electromagnetic control valve is closed in a state where the temperature detection device of 1 and the control signal for instructing the electromagnetic control valve to close are output. when it becomes equal to or higher than a predetermined temperature which can not, notify abnormality via the reporting device And that a control device configured so that.

  According to the present invention, in the construction machine configured to warm up the power storage device by circulating a part of the high-temperature cooling water used for cooling the heat generating device, the flow rate of the cooling water circulating through the power storage device is controlled. By detecting a failure of the electromagnetic control valve, it is possible to suppress a decrease in the life of the power storage device due to excessive warm-up.

1 is a diagram showing a schematic configuration of a hybrid hydraulic excavator according to a first embodiment of the present invention. 1 is a block diagram showing a power system of a hybrid hydraulic excavator according to a first embodiment of the present invention. It is a figure which shows the control flow of the control apparatus which concerns on 1st Example of this invention. It is a block diagram which shows the power system of the hybrid type hydraulic shovel which concerns on the 3rd Example of this invention. It is a figure which shows the control flow of the control apparatus which concerns on the 4th Example of this invention. It is a block diagram which shows the power system of the hybrid type hydraulic shovel which concerns on the 4th Example of this invention. It is a figure which shows schematic structure of the electrically driven hydraulic shovel which concerns on the 5th Example of this invention. FIG. 10 is a block diagram showing a power system of an electric hydraulic excavator according to a fifth embodiment of the present invention.

  Embodiments of the present invention will be described below with reference to the drawings. In addition, in each figure, the same code | symbol is attached | subjected to the same part and the overlapping description is abbreviate | omitted suitably.

  A first embodiment of the present invention will be described with reference to FIGS.

  FIG. 1 is a diagram illustrating a schematic configuration of a hybrid hydraulic excavator as an example of a construction machine according to the present embodiment.

  In FIG. 1, a hybrid hydraulic excavator (hereinafter simply referred to as “hydraulic excavator”) 1 includes a lower traveling body 100, an upper swing body 200, and an excavator mechanism 300.

  The lower traveling body 100 includes a pair of crawlers 101, a crawler frame 102, and a pair of traveling hydraulic motors 103 (all shown on the left side) that independently drive each crawler.

  The upper swing body 200 includes a swing frame 201 as a support structure. On the swing frame 201, a hydraulic pump 2 that supplies pressure oil to each hydraulic actuator, an engine 3 that drives the hydraulic pump 2, and an engine 3 are provided. Assist power generation motor 4 for assisting, turning device 5 for turning the upper turning body 200 with respect to the lower traveling body 100, turning hydraulic motor 6 for driving the turning device 5, turning electric motor 7 for assisting the turning hydraulic motor 6, and assist power generation A power storage device 8 for supplying electric power to the motor 4 and the swing electric motor 7 is mounted. Further, a monitor 9, a communication terminal 10, and the like are installed in a cab 202 provided on the front left side of the turning frame 201.

  The excavator mechanism 300 is attached to the upper swing body 200 so as to be pivotable in the vertical direction, an arm 302 pivotally attached to the tip of the boom 301, and pivotally attached to the tip of the arm 302. Bucket 303. The boom 301 rotates up and down by the expansion and contraction of the boom cylinder 304, the arm 302 rotates up and down and front and rear by the expansion and contraction of the arm cylinder 305, and the bucket 303 rotates by the expansion and contraction of the bucket cylinder 306. To do.

  FIG. 2 is a block diagram showing a power system of the excavator 1.

  In FIG. 2, the assist generator motor 4 is mechanically connected to the hydraulic pump 2 and the engine 3 that is a heat generating device, and functions as an electric motor that assists the engine 3 and converts surplus power of the engine 3 into electric power. It has a function as a generator.

  The swing electric motor 7 is mechanically connected to the swing device 5 and the swing hydraulic motor 6, and functions as an electric motor for assisting the swing hydraulic motor 6 and converts the swing energy at the time of swing braking into electric power for regeneration. It has a function as a generator.

  The power storage device 8 has a discharge function for supplying electric power to the assist power generation motor 4 and the swing electric motor 7 that are electrically connected, and a charge function for storing electric power generated by the assist power generation motor 4 and the swing electric motor 7. Have.

  The first cooling system 20 includes a first annular pipe 21 disposed so as to pass through the inside of the engine 3, a radiator 22 provided in the first annular pipe 21, and the first annular pipe 21 And a cooling pump 23 for circulating the refrigerant. The engine 3 is cooled by heat exchange with the refrigerant circulating in the first annular pipe 21. The refrigerant whose temperature has been raised by heat exchange with the engine 3 is radiated by the radiator 22 and cooled.

  The warm-up system 30 branches from the heat exchange plate 31 provided adjacent to the power storage device 8 and the downstream side of the engine 3 of the first cooling system and the upstream side of the radiator 22, and passes through the heat exchange plate 31. A branch pipe 32 arranged to join the downstream side of the radiator 22 and the upstream side of the cooling pump 23 of the first cooling system 20, and an electromagnetic valve 33 provided near the inlet of the branch pipe 32. . By opening the electromagnetic valve 33, a part of the high-temperature (about 90 ° C.) refrigerant that has passed through the engine 3 is supplied to the heat exchange plate 31, and the power storage device 8 is warmed up.

  The control device 11 performs opening / closing control of the electromagnetic valve 33 according to the temperature of the power storage device 8 detected by the battery temperature sensor 12. Further, the abnormality of the electromagnetic valve 33 is detected according to the control signal to the electromagnetic valve 33 and the temperature of the heat exchange plate 31 detected by the plate temperature sensor 13.

  First, the opening / closing control of the electromagnetic valve 33 at the normal time by the control device 11 will be described.

When the temperature of the power storage device 8 detected by the battery temperature sensor 12 is equal to or lower than a second specified value _TBL , which will be described later, it is determined that the power storage device 8 needs to be warmed up. A control signal for instructing valve opening (hereinafter referred to as “open signal”) is output. When the electromagnetic valve 33 is opened, a part of the refrigerant flows from the first cooling system 20 into the warm-up system 30, warms the heat exchange plate 31, and warms up the power storage device 8 that exchanges heat with the heat exchange plate 31. Done.

On the other hand, when the temperature of the power storage device 8 detected by the battery temperature sensor 12 is higher than the second specified value _TBL , it is determined that the warm-up of the power storage device 8 is unnecessary, and the control device 11 closes the electromagnetic valve 33. A control signal to be instructed (hereinafter referred to as “closed signal”) is output. When the electromagnetic valve 33 is closed, the flow of the refrigerant from the first cooling system 20 to the warming-up system 30 is stopped, and the warming-up of the power storage device 8 is stopped.

  However, when the electromagnetic valve 33 fails (for example, when the electromagnetic valve 33 bites foreign matter and is stuck open), the electromagnetic valve 33 does not close even if the control device 11 outputs a close signal to the electromagnetic valve 33. Therefore, the refrigerant continues to be supplied from the first cooling system 20 to the heat exchange plate 31. Since the refrigerant supplied to the heat exchange plate 31 has a high temperature (for example, 90 ° C.) due to heat exchange with the engine 3, if the refrigerant is continuously supplied to the warm-up system 30, the heat exchange plate 31 and the power storage device 8 become excessive. It will be heated up to. When the temperature of the power storage device 8 becomes high (for example, about 50 ° C.), the deterioration is accelerated and the life is shortened. Therefore, in order to suppress a decrease in the life of the power storage device 8, before the power storage device 8 is excessively heated. In addition, it is necessary to detect a failure of the electromagnetic valve 33 and take appropriate measures promptly (for example, after the hydraulic excavator 1 is retracted to a safe place, the engine 3 is stopped and a repair is awaited).

  FIG. 3 is a diagram illustrating a control flow of the control device 11 according to the present embodiment. In addition to the above-described normal opening / closing control of the electromagnetic valve 33, the control device 11 detects abnormality of the electromagnetic valve 33. Hereinafter, each step constituting the control flow will be described in order.

  In FIG. 3, first, it is determined whether or not a close signal is output to the electromagnetic valve 33 (step S1).

If it is determined in step S1 that the close signal is output to the electromagnetic valve 33 (YES), whether or not the temperature of the heat exchange plate 31 detected by the plate temperature sensor 13 is equal to or higher than the first specified value _TPH . Is determined (step S2). Here, the first specified value _TPH is set to a temperature that cannot be reached after the electromagnetic valve 33 is closed (that is, after the warm-up of the power storage device 8 is completed). Thereby, in spite of outputting the closing signal to the electromagnetic valve 33, a state in which the high-temperature refrigerant continues to be supplied to the warm-up system 30 and the temperature of the heat exchange plate 31 becomes excessively high (that is, the electromagnetic valve It is possible to detect a state in which the valve 33 cannot be closed.

If it is determined in step S2 that the temperature of the heat exchange plate 31 is equal to or higher than the first specified value _TPH (YES), it is determined that the electromagnetic valve 33 has failed, an abnormality is displayed on the monitor 9 and communication is performed. An abnormality is transmitted from the terminal 10 (step S3). Steps S1 to S3 described above constitute an abnormality detection flow of the electromagnetic valve 33.

  Subsequent to step S3, the charging / discharging of the power storage device 8 is restricted and the mode is shifted to a mode in which only the engine power is operated (step S4), and the process returns to step S1. Thereby, heat generation of power storage device 3 can be prevented, and the temperature rise of power storage device 8 can be suppressed.

On the other hand, when it is determined in step S1 that an open signal is output to the electromagnetic valve 33 (NO), or in step S2, the temperature of the heat exchange plate 31 is less than the first specified value _TPH (NO). when determining determines whether or not the temperature of the power storage device 8 detected by the battery temperature sensor 12 is below a second predetermined value T _BL (step S5). Here, the second specified value _TBL is set to a value (for example, 20 ° C.) obtained by adding a predetermined margin to the lower limit use temperature (for example, 10 ° C.) of the power storage device 8. Thereby, it can be determined whether or not the power storage device 8 needs to be warmed up.

Temperature of the power storage unit 8 in step S5 if it is determined to be equal to or less than the second predetermined value _{T BL} (YES), then outputs an open signal to the electromagnetic valve 33 (step S6), and returns to step S1.

If it is determined in step S5 that the temperature of the power storage device 8 is lower than the second specified value _TBL (NO), a close signal is output to the electromagnetic valve 33 (step S7), and the process returns to step S1. Steps S <b> 5 to S <b> 7 described above constitute a normal open / close control flow of the electromagnetic valve 33.

  According to the present embodiment, when the electromagnetic valve 33 that adjusts the flow rate of the refrigerant circulating in the power storage device 8 fails, an abnormality is displayed on the monitor 9 in the cab 202. Thereby, the operator who is operating hydraulic excavator 1 can promptly perform an appropriate measure for protecting power storage device 8, and can suppress a decrease in the life of power storage device 8.

  In addition, an abnormality is transmitted from the communication terminal 10 in the cab 202, and the failure of the electromagnetic valve 33 is notified to the service person who performs repair, so that the time until the service person arrives at the site can be shortened. Furthermore, since it is specified in advance that the failure location is the electromagnetic valve 33, the time required for identifying and repairing the cause of the failure can be shortened.

  In addition, when the electromagnetic valve 33 breaks down, a process (step S4) for restricting charging / discharging of the power storage device 8 is performed to prevent the power storage device 8 from being further heated due to heat generated by charging / discharging. Can do. In addition to or instead of the process of restricting charging / discharging of power storage device 8 (step S4), a process of reducing the number of revolutions of engine 3 (limiting the operation of the heat generating device) may be executed. Thereby, since the flow rate of the refrigerant circulating through the first cooling system 20 is reduced, the flow rate of the refrigerant supplied to the heat exchange plate 31 can be reduced, and the temperature rise of the power storage device 8 due to excessive warming up can be reduced. It becomes possible to suppress.

In this embodiment, in a state where the close signal to the electromagnetic valve 33, the temperature of the heat exchange plates 31 as compared with the first predetermined value T _PH, abnormality of the electromagnetic valve 33 on the basis of the comparison result However, the temperature of the heat exchange plate 31 is compared with the third specified value while the open signal is output to the electromagnetic valve 33, and the temperature of the heat exchange plate 31 is set to the third specified value. In such a case, a configuration is added in which a process of displaying an abnormality on the monitor 9 and transmitting an abnormality at the communication terminal 10 (step S3) and a process of restricting charging / discharging of the power storage device 8 (step S4) are displayed. May be. Here, since the temperature of the heat exchange plate 31 when the electromagnetic valve 33 is in the open state is expected to be higher than the temperature when the electromagnetic valve 33 is in the closed state, the third specified value is the first specified value in step S2. It is set to a value larger than a prescribed value _{TPH of} 1. Thereby, it is possible to detect an excessive temperature rise of the heat exchange plate 31 in the open state of the electromagnetic valve 33, and to suppress an excessive temperature rise of the power storage device 8.

  In addition, as the electromagnetic valve 33, it is good to use the normally closed valve comprised so that it might be in a valve closing state in the state which the electric power supply or the control signal from the control apparatus 11 interrupted. As a result, when the power supply unit for driving the electromagnetic valve 33, the control device 11, the other higher-level controller, or the like fails, the electromagnetic valve 33 is automatically closed and the warm-up of the power storage device 8 is stopped. Thus, excessive warm-up of the power storage device 8 can be prevented, and a reduction in the life of the power storage device 8 can be suppressed.

  In this embodiment, the operator is notified of the failure of the electromagnetic valve by displaying an abnormality on the monitor 9 of the driver's seat 202. However, the present invention is not limited to this, and a warning sound or the like is notified. Also good.

  In the present embodiment, the failure of the electromagnetic valve 33 is determined based on the temperature of the heat exchange plate 31, but the present invention is not limited to this, and the temperature of other parts of the first cooling system 20 ( For example, the determination may be made based on the temperature of the power storage device 8 that exchanges heat with the heat exchange plate 31, the temperature of the refrigerant that passes through the heat exchange plate 31, and the like.

  A second embodiment of the present invention will be described with reference to FIGS.

  FIG. 4 is a block diagram illustrating a power system of the excavator 1 according to the present embodiment. Hereinafter, the difference from the power system according to the first embodiment (see FIG. 2) will be mainly described.

  In FIG. 4, the power system according to the present embodiment further includes a second cooling system 40 for actively cooling the power storage device 8.

  The second cooling system 40 includes a second annular pipe 41 provided so as to pass through the inside of the heat exchange plate 31, a battery radiator 42 provided in the second annular pipe 41, and a second annular pipe. And a battery cooling pump 43 that circulates the refrigerant in the pipe 41. Control device 11 controls battery cooling pump 43 according to the temperature of power storage device 8 detected by battery temperature sensor 12. The heat exchange plate 31 is cooled by heat exchange with the refrigerant circulating in the first annular pipe 21. The refrigerant whose temperature has been raised by heat exchange with the heat exchange plate 31 is radiated by the battery radiator 42 and cooled.

  FIG. 5 is a diagram illustrating a control flow of the control device 11 according to the present embodiment. Hereinafter, the difference from the control flow (see FIG. 3) according to the first embodiment will be mainly described.

In FIG. 5, when it is determined in step S1 that an open signal is output to the electromagnetic valve 33 (NO), or in step S2, the temperature of the heat exchange plate 31 is less than the first specified value _TPH (NO ), It is determined whether or not the temperature of the power storage device 8 detected by the battery temperature sensor 12 is equal to or higher than a fourth specified value _TBH (step S8). Here, the fourth specified value _TBH is set to a value (for example, 40 ° C.) obtained by subtracting a predetermined margin from the use upper limit temperature (for example, 50 ° C.) of the power storage device 8.

When it is determined in step 8 that the temperature of the heat exchange plate 31 is equal to or higher than the fourth specified value _TBH (YES), the battery cooling pump 43 is operated (step S9), and the process returns to step S1.

On the other hand, if it is determined in step 8 that the temperature of the heat exchange plate 31 is lower than the fourth specified value _TBH (NO), the operation of the battery cooling pump 43 is stopped (step S10), and after step S5. Execute the process. Thereby, the electrical storage apparatus 8 can be kept at temperature lower than use upper limit temperature (for example, 50 degreeC).

  Following step 4, the battery cooling pump 43 is operated (step S11), and the process returns to step S1. That is, when a failure of the electromagnetic valve 33 is detected, the refrigerant is circulated in the second cooling system 40 to actively cool the power storage device 8 regardless of the temperature of the power storage device 8 detected by the battery temperature sensor 12. .

  According to this embodiment, in addition to the same effects as those of the first embodiment, the following effects can be achieved.

  When a failure of the electromagnetic valve 33 is detected, the refrigerant is circulated in the second cooling system 40 and the power storage device 8 is actively cooled, so that appropriate measures for protecting the power storage device 8 are promptly performed. Even when this is not possible, an increase in the temperature of the power storage device 8 due to excessive warm-up can be suppressed.

  A third embodiment of the present invention will be described with reference to FIG.

  FIG. 6 is a block diagram illustrating a power system of the excavator 1 according to the present embodiment. Hereinafter, the difference from the power system (see FIG. 4) according to the second embodiment will be mainly described.

  In FIG. 6, the warm-up system 30 according to the present embodiment includes a manual valve 34 that is disposed downstream of the electromagnetic valve 33 and upstream of the power storage device 8 and can be manually opened and closed. During normal operation of the hydraulic excavator 1, the manual valve 34 is in an open state. At this time, the first cooling system 20 and the warm-up system 30 function in the same manner as in the second embodiment (see FIG. 4). On the other hand, when the abnormality of the electromagnetic valve 33 is notified via the monitor 9, the manual valve 34 is closed by the operator.

  According to the present embodiment, in addition to the same effects as those of the second embodiment, the following effects can be achieved.

  Even when the electromagnetic valve 33 breaks down, the inflow of the refrigerant from the first cooling system 20 to the warm-up system 30 can be stopped by closing the manual valve 34. Thereby, even when the operation of the hydraulic excavator 1 is continued in a state where the electromagnetic valve 33 is broken, it is possible to prevent the temperature of the power storage device 8 from being excessively warmed up.

  A fourth embodiment of the present invention will be described with reference to FIGS.

  FIG. 7 is a diagram showing a schematic configuration of an electric hydraulic excavator as an example of the construction machine according to the present embodiment, and FIG. 8 is a block diagram showing a power system of the electric hydraulic excavator according to the present embodiment. .

  7 and 8, the difference from the second embodiment (see FIGS. 1 and 4) is that an electric motor 3A is provided instead of the engine 3 (see FIG. 1) and the assist generator motor 4. It is.

  According to the present embodiment, the same effect as that of the second embodiment can be achieved in the electric hydraulic excavator 1A using the electric motor 3A as a prime mover.

  As mentioned above, although the Example of this invention was explained in full detail, this invention is not limited to an above-described Example, Various modifications are included. For example, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described. It is also possible to add a part of the configuration of another embodiment to the configuration of a certain embodiment, and delete a part of the configuration of a certain embodiment or replace it with a part of another embodiment. Is possible.

DESCRIPTION OF SYMBOLS 1 ... Hybrid hydraulic excavator (construction machine), 1A ... Electric hydraulic excavator (construction machine), 2 ... Hydraulic pump, 3 ... Engine (heat generating equipment), 3A ... Electric motor (heat generating equipment), 4 ... Assist power generation motor, DESCRIPTION OF SYMBOLS 5 ... Turning apparatus, 6 ... Turning hydraulic motor, 7 ... Swing electric motor, 8 ... Power storage apparatus, 9 ... Monitor (notification apparatus), 10 ... Communication terminal, 11 ... Control apparatus, 12 ... Battery temperature sensor (2nd temperature) Sensor), 13 ... Plate temperature sensor (first temperature sensor), 20 ... First cooling system, 21 ... First annular pipe, 22 ... Radiator (first heat dissipation device), 23 ... Cooling pump (first 30 ... warm-up system, 31 ... heat exchange plate (heat exchange device), 32 ... branch piping, 33 ... electromagnetic valve (electromagnetic control valve), 34 ... manual valve (manual control valve), 40 ... first 2 cooling systems, 41 ... 2 annular pipes, 42 ... battery radiator (second heat dissipation device), 43 ... battery cooling pump (second cooling pump), 100 ... lower traveling body, 101 ... crawler, 102 ... crawler frame, 103 ... running Hydraulic motor, 200 ... upper turning body, 201 ... turning frame, 202 ... cab, 300 ... shovel mechanism, 301 ... boom, 302 ... arm, 303 ... bucket, 304 ... boom cylinder, 305 ... arm cylinder, 306 ... bucket cylinder , T _PH ... 1st specified value (predetermined specified value), T _BL ... 2nd specified value, T _BH ... 4th specified value.

Claims (6)

Heating equipment,
A first cooling system that cools the heat generating device by circulating a refrigerant between the heat generating device and the first heat dissipation device by a first cooling pump;
A power storage device;
A warm-up system that branches off from the first cooling system and supplies a part of the refrigerant to a heat exchange device provided adjacent to the power storage device to warm up the power storage device;
An electromagnetic control valve provided upstream of the heat exchange device of the warm-up system;
A notification device provided in the cab;
A first temperature detecting device for detecting a temperature of a predetermined part of the warm-up system;
The temperature detected by the first temperature detection device is not less than a predetermined temperature that cannot be reached after the electromagnetic control valve is closed while the control signal for instructing the electromagnetic control valve to be closed is output. A construction machine comprising: a control device configured to notify an abnormality via the notification device in the event of a failure. The construction machine according to claim 1, wherein the electromagnetic control valve is configured to be in a closed state when power supply or a control signal from the control device is interrupted. The construction machine according to claim 1,
A second cooling system for cooling the power storage device by circulating a refrigerant between the power storage device and the second heat dissipation device by a second cooling pump;
Wherein the control device, in a state that outputs a control signal instructing the closed to the electromagnetic control valve, when the temperature detected by the first temperature detector becomes the predetermined temperature or higher, the A construction machine configured to operate a second cooling pump. The construction machine according to claim 1,
Wherein the control device, in a state that outputs a control signal instructing the closed to the electromagnetic control valve, when the temperature detected by the first temperature detector becomes the predetermined temperature or higher, the A construction machine configured to limit charging / discharging of a power storage device. The construction machine according to claim 1,
Wherein the control device, in a state that outputs a control signal instructing the closed to the electromagnetic control valve, when the temperature detected by the first temperature detector becomes the predetermined temperature or higher, the A construction machine configured to limit operation of a heat generating device. The construction machine according to claim 1,
The warm-up system has a manual control valve that is disposed downstream of the electromagnetic control valve and upstream of the power storage device and can be manually opened and closed.

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