Transport vehicle

Abstract

Provided is a transportation vehicle in which a cleaning function of an exhaust gas purification device is achieved while an increase in weight and cost is suppressed.　This transportation vehicle includes: a diesel engine; a generator; a traveling motor that generates a driving force for rotating a tire with electric power generated by the generator and generates electric power by braking of the tire; a grid box that converts the electric power generated by the generator and / or the traveling motor into heat and consumes the heat; an exhaust gas purification device that removes harmful substances contained in exhaust gas generated from the diesel engine; and a controller which, when a load required for increasing the temperature of the exhaust gas to a cleaning temperature is generated by the generator and it is determined that additional electric power, which is additionally generated by the generator, can be consumed in the grid box, causes electric power to be additionally generated by the generator, the harmful substances accumulated in the exhaust gas purification device to be removed, and the generated additional electric power to be additionally consumed in the grid box.

Description

[Technical Field]

[0001] The present invention relates to a transport vehicle equipped with an exhaust gas purification device. [Background technology]

[0002] Conventionally, dump trucks have been known that include a diesel engine, a generator that generates electricity using the driving force of the diesel engine, a traction motor that generates driving force to rotate the tires using the electricity generated by the generator and generates electricity when the tires are braked, and a grid box that converts the electricity generated by the traction motor into heat for consumption (see, for example, Patent Document 1).

[0003] Furthermore, in order for diesel engines to comply with recent exhaust gas regulations, an exhaust gas purification device that removes harmful substances such as particulate matter (PM) and nitrogen oxides (NOx) contained in exhaust gas is required (see, for example, Patent Document 2). However, the removed particulate matter (PM) and hydrocarbons (HC) generated when diesel engines are driven at low loads can accumulate in the exhaust gas purification device and cause it to malfunction.

[0004] Therefore, Patent Document 3 proposes a method of cleaning (so-called regeneration treatment) the exhaust gas purification device by generating electricity using a generator connected to the engine, increasing the engine load and exhaust temperature, and burning off the deposits. The electricity generated at this time is stored in a battery. Also, Patent Document 4 proposes a method of dissipating the electricity generated by the generator for cleaning in a resistor installed inside the muffler. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6438273 [Patent Document 2] Patent No. 5864036 [Patent Document 3] Patent No. 7005389 [Patent Document 4] International Publication No. 2020 / 091750 Summary of the Invention [Problem to be solved by the invention]

[0006] However, the method of Patent Document 3 requires the installation of an extra battery to store the power generated during cleaning, which poses issues of increased weight and cost.Furthermore, the method of Patent Document 4 requires the installation of a resistor inside the muffler, which not only increases the weight and cost of the muffler but also poses issues of thermal damage to the resistor due to high-temperature exhaust gas.

[0007] The present invention has been made in view of the above-mentioned problems, and its object is to provide a transport vehicle that can achieve the cleaning function of an exhaust gas purification device while suppressing increases in weight and cost. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention provides a transport vehicle comprising: a diesel engine; a generator that generates electricity using the driving force of the diesel engine; a traction motor that generates driving force to rotate tires using the electricity generated by the generator and generates electricity when the tires are braked; a grid box that converts the electricity generated by at least one of the generator and the traction motor into heat and consumes it; and a controller that controls the diesel engine, the generator, and the traction motor; the transport vehicle further comprising an exhaust gas purification device that removes harmful substances contained in exhaust gas generated by the diesel engine; when the controller causes the generator to generate a load necessary to raise the exhaust gas to a cleaning temperature, the controller determines whether the grid box can consume the additional power generated by the generator; and if it determines that the grid box can consume the additional power, the controller causes the generator to additionally generate the additional power to remove harmful substances that have accumulated in the exhaust gas purification device and the grid box also consumes the additional power. [Effects of the Invention]

[0009] According to the present invention, it is possible to realize the cleaning function of an exhaust gas purification device while suppressing increases in weight and cost. Note that problems, configurations, and effects other than those described above will become apparent from the following description of the embodiments. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 2 is a side view of the dump truck. [Figure 2] FIG. 1 is a perspective view of a dump truck. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. 2 is a circuit diagram of a drive circuit mounted on a dump truck. [Figure 6] FIG. 2 is a hardware configuration diagram of the dump truck. [Figure 7] 10 is a flowchart of a cleaning process according to the first embodiment. [Figure 8] 10 is a flowchart of a cleaning process according to a second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] An embodiment of a transport vehicle according to the present invention will be described with reference to the drawings. Fig. 1 is a side view of a dump truck 1. Fig. 2 is a perspective view of the dump truck 1. Fig. 3 is a plan view of a body frame 2. In this specification, front, rear, left, and right are based on the viewpoint of an operator who is on board and operating the dump truck 1, unless otherwise specified. In addition, a specific example of the transport vehicle is not limited to the dump truck 1, and may be a wheel loader or the like.

[0012] [Dump truck 1 structure] As shown in Figures 1 to 3, the dump truck 1 according to this embodiment mainly comprises a body frame 2 (body), a pair of front tires 3L, 3R rotatably supported on both the left and right ends of the front of the body frame 2, a pair of rear tires 4L, 4R rotatably supported on both the left and right ends of the rear of the body frame 2, a loading platform 5 supported on the body frame 2 so that it can be raised and lowered, and a cab 6 in which an operator who operates the dump truck 1 rides.

[0013] The pair of front tires 3L, 3R are steered wheels whose steering angle changes according to the steering operation by the operator. On the other hand, the pair of rear tires 4L, 4R are drive wheels that rotate by receiving the driving force of the travel motors 15L, 15R. The dump truck 1 is equipped with a pair of travel motors 15L, 15R to transmit the driving force independently to each of the pair of rear tires 4L, 4R.

[0014] The loading platform 5 rises and falls vertically around a hinge pin 8 at the rear of the body frame 2 as the hoist cylinders 7L, 7R extend and retract. One end of the hoist cylinders 7L, 7R is connected to the body frame 2, and the other end is connected to the loading platform 5, and they extend and retract with hydraulic oil supplied from a hydraulic pump (not shown). When the hoist cylinders 7L, 7R extend, the loading platform 5 stands up, and when the hoist cylinders 7L, 7R retract, the loading platform 5 falls down.

[0015] The cab 6 is disposed at the left end on the deck 9 at the front end of the body frame 2. The cab 6 forms a driver's cab in which an operator who operates the dump truck 1 sits. Inside the cab 6, an operating device 20 (see FIG. 4) for operating the dump truck 1 is disposed. When the operator sitting in the cab 6 operates the operating device 20, the dump truck 1 travels (accelerates, brakes, turns) and the loading platform 5 is raised and lowered.

[0016] Fig. 4 is a diagram showing the inside of the cab 6. The operation device 20 includes, for example, a steering wheel 21, an accelerator pedal 22, and a brake pedal 23 shown in Fig. 4, as well as a travel lever and a hoist lever. The operation device 20 outputs an operation signal according to a user's operation to a controller 30 (see Fig. 6) described later.

[0017] The steering wheel 21 is an operating device that commands the turning direction of the dump truck 1. The accelerator pedal 22 is an operating device that commands the acceleration of the dump truck 1. The brake pedal 23 is an operating device that commands the braking of the dump truck 1 (rear tires 4L, 4R). The travel lever is an operating device that commands the traveling direction (forward position, reverse position, neutral position) of the dump truck 1 when the accelerator pedal 22 is depressed. The hoist lever is an operating device that commands the raising and lowering of the loading platform 5 (upright position, tilted position).

[0018] 1, the dump truck 1 is provided with a drive circuit 10 that drives the dump truck 1. Of the components of the drive circuit 10, the diesel engine 11, the generator 12, and the exhaust gas purification device 18 are mounted on the vehicle body frame 2, the travel motors 15L and 15R are mounted on the rear axle, and the AC / DC converter 13, the inverters 14L and 14R, the chopper 16, and the grid box 17 are disposed on the deck 9.

[0019] 5 is a circuit diagram of a drive circuit 10 mounted on the dump truck 1. The drive circuit 10 mainly includes, for example, a diesel engine 11, a generator 12, an AC / DC converter 13, inverters 14L and 14R, travel motors 15L and 15R, a chopper 16, a grid box 17, and an exhaust gas purification device 18.

[0020] The diesel engine 11 burns fuel (diesel oil) to generate driving force for driving the dump truck 1. The generator 12 is connected to the output shaft of the diesel engine 11. The driving force of the diesel engine 11 is transmitted to the generator 12, which generates three-phase AC power. The AC / DC converter 13 converts the three-phase AC power output from the generator 12 into DC power and outputs it to the inverters 14L, 14R and the chopper 16.

[0021] The inverters 14L, 14R convert the DC power output from the AC / DC converter 13 into three-phase AC power and output it to the traveling motors 15L, 15R. The traveling motors 15L, 15R receive the three-phase AC power from the inverters 14L, 14R and generate driving force that rotates the rear tires 4L, 4R. The driving force of the traveling motors 15L, 15R is then transmitted to the rear tires 4L, 4R via a reducer (not shown), causing the dump truck 1 to travel (accelerate).

[0022] On the other hand, when braking the dump truck 1, the traveling motors 15L, 15R operate as electric brakes. The traveling motors 15L, 15R operating as electric brakes generate regenerative power and output it to the inverters 14L, 14R. The inverters 14L, 14R convert the three-phase AC regenerative power output from the traveling motors 15L, 15R into DC power and output it to the chopper 16.

[0023] The chopper 16 supplies the power output from the AC / DC converter 13 and the inverters 14L, 14R to the grid box 17. The grid box 17 is a resistor that converts the power generated by at least one of the generator 12 and the traction motors 15L, 15R into heat and consumes it.

[0024] The exhaust gas purification device 18 is provided midway through a muffler 19 (exhaust pipe) for discharging exhaust gas generated by the diesel engine 11 to the outside of the dump truck 1. The exhaust gas purification device 18 includes both or either a urea SCR (Selective Catalytic Reduction) system that removes nitrogen oxides (NOx) contained in the exhaust gas flowing through the muffler 19, and a DPF (Diesel Particulate Filter) that removes particulate matter (PM, Particulate Matter) such as soot. The exhaust gas purification device 18 may also remove carbon monoxide and hydrocarbons contained in the exhaust gas flowing through the muffler 19 by oxidizing them with an oxidation catalyst. Particulate matter (PM), nitrogen oxides (NOx), and hydrocarbons (HC) are examples of harmful substances contained in exhaust gas.

[0025] The exhaust gas purification device 18 (urea SCR system) removes nitrogen oxides (NOx) from the exhaust gas flowing through the muffler 19 and discharges the exhaust gas from which the nitrogen oxides have been removed into the atmosphere. More specifically, the exhaust gas purification device 18 decomposes the nitrogen oxides contained in the exhaust gas into water and nitrogen with ammonia by injecting urea into the exhaust gas flowing through the muffler 19. In addition, the exhaust gas purification device 18 (DPF) captures particulate matter (PM, for example soot) contained in the exhaust gas using a filter and discharges the exhaust gas from which the PM has been removed into the atmosphere.

[0026] 6 is a hardware configuration diagram of the dump truck 1. The dump truck 1 is equipped with a controller 30. Note that the controller 30 may include, for example, a DSC (Digital Signal Controller) that controls the overall operation of the dump truck 1, and an ECU (Engine Control Unit) that controls the drive of the diesel engine 11. However, in this specification, these will be collectively referred to as the "controller 30."

[0027] The controller 30 includes a CPU (Central Processing Unit) 31 and a memory 32. The memory 32 is configured, for example, with a ROM (Read Only Memory), a RAM (Random Access Memory), an HDD (Hard Disk Drive), or a combination of these. The controller 30 realizes the processing described below by having the CPU 31 read and execute program code stored in the ROM or HDD. The RAM is used as a work area when the CPU 31 executes the program.

[0028] However, the specific configuration of the controller 30 is not limited to this, and may be realized by hardware such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field-Programmable Gate Array).

[0029] The controller 30 controls the diesel engine 11, the generator 12, the AC / DC converter 13, the inverters 14L and 14R, and the chopper 16 based on an operation signal output from the operation device 20, for example.

[0030] In response to depression of the accelerator pedal 22, the controller 30 increases the rotation speed of the diesel engine 11, outputs the electric power generated by the generator 12 to the inverters 14L, 14R, and controls the inverters 14L, 14R to increase the rotation speed of the travel motors 15L, 15R. The accelerator pedal 22 outputs an operation signal indicating the amount of depression (accelerator operation amount). The controller 30 increases the rotation speed of the travel motors 15L, 15R as the amount of depression indicated by the operation signal increases.

[0031] Furthermore, in response to depression of the brake pedal 23, the controller 30 reduces the rotation speed of the diesel engine 11 and operates the traveling motors 15L, 15R as electric brakes. Furthermore, when braking the dump truck 1, the controller 30 outputs regenerative power generated by the traveling motors 15L, 15R to the chopper 16 via the inverters 14L, 14R. As a result, the regenerative power generated by the traveling motors 15L, 15R is converted into heat and consumed in the grid box 17. The brake pedal 23 outputs an operation signal indicating a depression amount B (amount of brake operation). The controller 30 increases the braking force (regenerative power) of the rear tires 4R, 4L as the depression amount B indicated by the operation signal increases.

[0032] Furthermore, the controller 30 increases or decreases the amount of power generated by the generator 12 within a range of the maximum power generation amount determined according to the rotation speed of the diesel engine 11. More specifically, the controller 30 controls the generator 12 to generate the traveling power to be supplied to the traveling motors 15L, 15R and the auxiliary power to be supplied to the auxiliary equipment (not shown) mounted on the dump truck 1. The traveling power increases or decreases according to, for example, the depression amount of the accelerator pedal 22. The auxiliary power increases or decreases according to whether the auxiliary equipment is driven or stopped. Furthermore, in the cleaning process described below, the controller 30 controls the additional power P in addition to the traveling power and the auxiliary power. L or available power P R The generator 12 generates additional electricity.

[0033] Furthermore, the controller 30 executes a cleaning process shown in FIG. 7 or FIG. 8. The cleaning process is a process for removing hydrocarbons (HS) deposited in the exhaust gas purification device 18 (urea SCR system). More specifically, when the diesel engine 11 is driven at a low load, hydrocarbons are generated. These hydrocarbons flow through the muffler 19 together with the exhaust gas and deposit on the surface of the exhaust gas purification device 18. The hydrocarbons deposited on the surface can cause the exhaust gas purification device 18 to malfunction. The cleaning process is also a process for removing particulate matter (PM) deposited in the exhaust gas purification device 18 (DPF). More specifically, when the diesel engine 11 is driven, PM (e.g., soot) is generated. This PM flows through the muffler 19 together with the exhaust gas and deposits on the filter portion of the exhaust gas purification device 18. The deposited PM can cause the exhaust gas purification device 18 to malfunction.

[0034] Therefore, in the cleaning process, the controller 30 removes hydrocarbons and the like deposited on the surface of the exhaust gas purification device 18 by increasing the temperature of the exhaust gas. The temperature of the exhaust gas increases by increasing the load on the diesel engine 11. Increasing the amount of power generated by the generator 12 increases the load on the diesel engine 11. Increasing the rotation speed of the diesel engine 11 also increases the flow rate of the exhaust gas. In order to ensure the flow rate of the exhaust gas required for the cleaning process, the operator may depress the accelerator pedal 22, or the controller 30 may adjust the rotation speed of the diesel engine 11.

[0035] The memory 32 stores a counter. The controller 30 increments the counter when the exhaust temperature of the diesel engine 11 remains below a predetermined value for a predetermined period of time. The controller 30 decrements the counter when the exhaust temperature of the diesel engine 11 remains above a predetermined value for a predetermined period of time. The controller 30 then executes a cleaning process when the counter value exceeds a threshold value. Furthermore, the controller 30 resets the counter (assigns 0) when the cleaning process has been executed.

[0036] [Cleaning Process According to the First Embodiment] 7 is a flowchart of the cleaning process according to the first embodiment. First, the controller 30 calculates the additional power P that the generator 12 generates when a load necessary for raising the exhaust gas temperature of the diesel engine 11 to the cleaning temperature is applied to the generator 12. L The controller 30 also identifies the additional power P that the grid box 17 can consume (S11). R (S12). L and available power consumption P R changes depending on the traveling state of the dump truck 1.

[0037] The cleaning temperature is the temperature of the exhaust gas required to remove hydrocarbons and the like deposited on the surface of the exhaust gas purification device 18. The cleaning temperature is determined in advance and stored in the memory 32. The additional power P L is the value obtained by subtracting the traveling power and the auxiliary power from the required power that the generator 12 must generate in order to generate the load required to raise the exhaust gas temperature to the cleaning temperature. In other words, required power = traveling power + auxiliary power + additional power P L In addition, if the total of the running power and auxiliary power already exceeds the required power (i.e., the exhaust gas has already reached the cleaning temperature), the additional power P L =0.

[0038] Consumable power P R is the maximum power consumption that can be consumed by the grid box 17 minus the regenerative power generated by the traction motors 15L and 15R. In other words, maximum power consumption = regenerative power + consumable power P R In addition, when the traction motors 15L and 15R are driven by the power supplied from the generator 12 (i.e., power running), the consumable power P R = Maximum power consumption. Also, the maximum power consumption is greater than the required power.

[0039] Next, the controller 30 calculates the additional power P L and the available power P determined in the previous step S12. R The process of step S13 is to compare the additional power P generated by the generator 12 when a load required to raise the exhaust gas temperature to the cleaning temperature is generated on the generator 12 (i.e., the required power is generated by the generator 12). L This is an example of a process for determining whether or not the grid box 17 can consume the resource.

[0040] Next, the controller 30 calculates the available power P R is the additional power P L If the power is equal to or greater than the power required for the grid box 17 (S13: Yes), the grid box 17 calculates the additional power P LThe controller 30 then determines that the generator 12 can consume additional power P L (in other words, the generator 12 generates the required power) (S14). This raises the temperature of the exhaust gas to a cleaning temperature, and hydrocarbons and the like deposited on the surface of the exhaust gas purification device 18 are removed (cleaned). The controller 30 also controls the grid box 17 to generate the additional power P L (S15). Furthermore, the controller 30 may prompt the operator to depress the accelerator pedal 22 via an alarm device provided in the cab 6. This increases the flow rate of exhaust gas at the cleaning temperature.

[0041] On the other hand, the controller 30 controls the available power P R is the additional power P L If it is less than (S13: No), the grid box 17 adds additional power P L Next, the controller 30 determines that the additional power P L and available power P R The difference between (P L -P R ) and the threshold P th Compare with the threshold P th is, for example, the power P that can be consumed by the generator 12 R The value is set to a value that can raise the temperature of the exhaust gas to a temperature close to the cleaning temperature when additional power is generated.

[0042] Next, the controller 30 calculates the available power P R is the additional power P L Less than or equal to the additional power P L and available power P R The difference between this and the threshold P th If it is less than (S13: No & S16: Yes), the power that can be consumed by the generator 12 P R This causes the temperature of the exhaust gas to rise to a temperature close to the cleaning temperature. R On the other hand, the controller 30 consumes additional power PR is the additional power P L Less than or equal to the additional power P L and available power P R The difference between this and the threshold P th If the number is equal to or greater than the number (S13: No & S16: No), the process proceeds to step S19 without executing steps S17 to S18.

[0043] Next, the controller 30 determines whether cleaning of the exhaust gas purification device 18 has been completed (S19). The controller 30 may determine that cleaning has been completed, for example, when a predetermined time has elapsed since the temperature of the exhaust gas detected by a temperature sensor (not shown) reached the cleaning temperature. If the controller 30 determines that cleaning has not yet been completed (S19: No), it executes the processing from step S11 onwards again. In other words, the controller 30 repeatedly executes the processing from step S11 to S18 until cleaning is completed.

[0044] On the other hand, if the controller 30 determines that the cleaning is completed (S19: Yes), the controller 30 ends the cleaning process. That is, the controller 30 causes the generator 12 to generate the traveling power and the auxiliary power, and causes the grid box 17 to consume the regenerated power.

[0045] According to the first embodiment, for example, the following advantageous effects are achieved.

[0046] According to the first embodiment, the consumable power P R is the additional power P L If the temperature is equal to or higher than the cleaning temperature (S13: Yes), even if the generator 12 generates a load necessary to raise the exhaust gas temperature to the cleaning temperature (S14), the additional power P L The grid box 17 can be made to consume the regenerated power. Here, the grid box 17 is an existing facility that has conventionally been mounted on the dump truck 1 in order to consume the regenerated power, so cleaning of the exhaust gas purification device 18 can be realized while suppressing increases in weight and cost.

[0047] Furthermore, according to the first embodiment, the consumable power P R is the additional power P L Less than or equal to the additional power P L and available power P R The difference between this and the threshold P th If it is less than (S13: No & S16: Yes), the power that can be consumed by the generator 12 P R By generating additional power (S17), cleaning cannot be performed immediately, but the exhaust gas can be brought closer to the cleaning temperature. As a result, the consumable power P R When there is a margin of error (for example, when the brake pedal 23 is released), the time required to raise the exhaust gas temperature to the cleaning temperature can be shortened.

[0048] On the other hand, additional power P L and available power P R The difference between this and the threshold P th In the above case (i.e., the available power P R When the power consumption P R Even if additional power is generated, the temperature rise of the exhaust gas is limited. Therefore, by skipping the processes of steps S17 and S18, it is possible to prevent a deterioration in fuel economy. However, the process of step S16 can be omitted. That is, the controller 30 calculates the consumable power P R is the additional power P L If it is less than this, the processes of steps S17 to S18 may be executed.

[0049] [Cleaning Process According to the Second Embodiment] FIG. 8 shows the cleaning process according to the second embodiment. Note that detailed description of the process common to the first embodiment will be omitted, and the differences will be mainly described. The structure of the dump truck 1 according to the second embodiment is common to the first embodiment. On the other hand, the cleaning process according to the second embodiment is performed by applying an additional power P generated by the generator 12 when a load required to raise the exhaust gas temperature to the cleaning temperature is applied to the generator 12. LThe method of determining whether or not the grid box 17 can consume the resource (S21) differs from that of the first embodiment.

[0050] First, the controller 30 determines whether the traveling motors 15L, 15R are generating regenerative power (in other words, whether the brake pedal 23 is depressed) (S21). If the traveling motors 15L, 15R are generating regenerative power (S21: Yes), the controller 30 waits for execution of the processing from step S11 onwards. On the other hand, if the traveling motors 15L, 15R are not generating regenerative power (S21: No), the controller 30 determines whether the grid box 17 is generating additional power P L is determined to be consumable, and the processes of steps S11 to S19 are executed.

[0051] According to the second embodiment, cleaning of the exhaust gas purification device 18 can be achieved while suppressing increases in weight and cost. In addition, when a load required to raise the temperature of the exhaust gas to the cleaning temperature is applied to the generator 12, the additional electric power P L Since the method for determining whether or not the grid box 17 can consume the resource is simplified compared to the first embodiment, the processing load on the controller 30 is reduced.

[0052] The above-described embodiments are merely illustrative examples of the present invention, and are not intended to limit the scope of the present invention to these embodiments. Those skilled in the art can implement the present invention in various other forms without departing from the spirit of the present invention. [Explanation of symbols]

[0053] 1 dump truck 2 Body frame 3L, 3R front tires 4L, 4R rear tires 5 Cargo bed 6 Cab 7L, 7R hoist cylinder 8 hinge pins 9 Decks 10. Drive circuit 11. Diesel engine 12. Generator 13 AC / DC converter 14L, 14R inverter 15L, 15R traction motor 16 Chopper 17 Grid Box 18 Exhaust gas purification device 19 Muffler 20 Operating device 21 Steering wheel 22 Accelerator pedal 23 Brake pedal 30 Controllers 31 CPU 32 memory

Claims

1. Diesel engines and a generator that generates electricity using the driving force of the diesel engine; a traction motor that generates a driving force for rotating tires using the electric power generated by the generator and generates electric power when the tires are braked; a grid box that converts electric power generated by at least one of the generator and the traction motor into heat and consumes the heat; A transport vehicle including a controller that controls the diesel engine, the generator, and the travel motor, Further provided is an exhaust gas purification device for removing harmful substances contained in exhaust gas generated from the diesel engine, The controller determining whether the grid box can consume additional power generated by the generator when the generator generates a load necessary to raise the exhaust gas to a cleaning temperature; When it is determined that the grid box can consume the additional power, the generator generates the additional power to remove harmful substances accumulated in the exhaust gas purification device, and the grid box consumes the additional power.

2. The transport vehicle according to claim 1, The controller Identifying the additional power and the additional available power that the grid box can consume; When the consumable power is equal to or greater than the additional power, the transport vehicle determines that the grid box can consume the additional power.

3. The transport vehicle according to claim 2, When the consumable power is less than the additional power, the controller causes the generator to generate additional consumable power to increase the temperature of the exhaust gas, and causes the grid box to consume additional consumable power.

4. The transport vehicle according to claim 3, When the consumable power is less than the additional power and the difference between the additional power and the consumable power is less than a threshold, the controller generates additional consumable power using the generator to increase the temperature of the exhaust gas and consumes additional consumable power using the grid box.

5. The transport vehicle according to claim 1, The transport vehicle, wherein the controller determines that the additional power can be consumed by the grid box when the traction motor is not generating power.

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