Transport vehicle

Abstract

Provided is a transport vehicle in which an increase in weight and cost is suppressed and a cleaning function of an exhaust gas purification device is achieved. The transport vehicle has: a diesel engine; a generator; a travel motor for generating a driving force for rotating the tire by using the power generated by the generator, and generating power by braking the tire; a grid box which converts the electric power generated by at least one of the generator and the travel motor into heat and consumes the heat; an exhaust gas purification device for removing harmful substances contained in exhaust gas generated from the diesel engine; and a controller that removes harmful substances accumulated in the exhaust gas purification device by means of additional power generation of the generator when it is determined that additional power for additional power generation of the generator can be consumed by the grid box when the generator generates a load necessary to raise the exhaust gas to a clean temperature. And additionally consumes additional power by using the grid box.

Description

Technical Field

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

[0002] In the past, a dump truck is known, which includes: a diesel engine; a generator that generates electricity using the driving force of the diesel engine; a travel motor that generates a driving force for rotating tires using the electricity generated by the generator and generates electricity by braking the tires; and a grid box that converts the electricity generated by the travel motor into heat for consumption (for example, refer to Patent Document 1).

[0003] In addition, in order for diesel engines to cope with recent exhaust gas regulations, an exhaust gas purification device is required to remove harmful substances such as particulate matter (PM) and nitrogen oxides (NOx) contained in the exhaust gas (for example, see Patent Document 2). However, the removed particulate matter (PM) and hydrocarbons (HC) generated when the diesel engine is driven at a low load may accumulate in the exhaust gas purification device and cause functional defects.

[0004] Therefore, Patent Document 3 proposes the following method: by causing a generator connected to the engine to generate electricity, the engine load is increased to increase the exhaust temperature, and the deposits are burned, thereby cleaning the exhaust gas purification device (so-called regeneration treatment). The electricity generated at this time is stored in the battery. In addition, Patent Document 4 proposes the following method: causing a resistor provided inside the muffler to consume the electricity generated by the generator for cleaning.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent No. 6438273

[0008] Patent Document 2: Japanese Patent No. 5864036

[0009] Patent Document 3: Japanese Patent No. 7005389

[0010] Patent Document 4: International Publication No. 2020 / 091750 Summary of the invention

[0011] Problems to be solved by the invention

[0012] However, in the method of Patent Document 3, in order to store the electricity generated during cleaning, an additional battery needs to be installed, which increases the weight and cost. In addition, in the method of Patent Document 4, a resistor is provided inside the muffler, which increases the weight and cost of the muffler, and heat damage to the resistor caused by high-temperature exhaust gas also becomes a problem.

[0013] The present invention has been made in view of the above-mentioned problems, and an object of the present invention is to provide a transport vehicle capable of achieving the cleaning function of an exhaust gas purification device while suppressing an increase in weight and a rise in cost.

[0014] Means for solving problems

[0015] In order to achieve the above-mentioned object, the present invention is a transport vehicle comprising: a diesel engine; a generator, which generates electricity using the driving force of the diesel engine; a travel motor, which generates a driving force for rotating tires using the electricity generated by the generator, and generates electricity by braking the tires; a grid box, which converts the electricity generated by at least one of the generator and the travel motor into heat for consumption; and a controller, which controls the diesel engine, the generator and the travel motor. The transport vehicle is characterized in that it also comprises: an exhaust gas purification device, which removes harmful substances contained in the exhaust gas generated by the diesel engine, and the controller determines whether the additional electricity generated by the generator can be consumed by the grid box when the controller causes the generator to generate a load required to raise the exhaust gas to a clean temperature. When it is determined that the additional electricity can be consumed by the grid box, the generator generates the additional electricity to remove harmful substances accumulated in the exhaust gas purification device, and the additional electricity is consumed by the grid box.

[0016] Effects of the Invention

[0017] According to the present invention, it is possible to achieve the cleaning function of the exhaust gas purification device while suppressing the increase in weight and cost. In addition, other problems, structures and effects than those described above will become clear through the description of the following embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a side view of a dump truck.

[0019] Figure 2 It is a perspective view of a dump truck.

[0020] Figure 3 It is a top view of the frame.

[0021] Figure 4 It is a figure which shows the interior of a cab.

[0022] Figure 5This is a circuit diagram of a drive circuit mounted on a dump truck.

[0023] Figure 6 It is a hardware structure diagram of a dump truck.

[0024] Figure 7 This is a flowchart of the cleaning process according to the first embodiment.

[0025] Figure 8 This is a flowchart of the cleaning process according to the second embodiment. DETAILED DESCRIPTION

[0026] Embodiments of the transport vehicle of the present invention will be described using the drawings. Figure 1 is a side view of the dump truck 1 . Figure 2 It is a perspective view of the dump truck 1 . Figure 3 It is a top view of the vehicle frame 2. In addition, unless otherwise specified, the front, back, left, and right in this specification are based on the viewpoint of the operator who is riding on the dump truck 1 to operate. In addition, the specific example of the transport vehicle is not limited to the dump truck 1, and may also be a wheel loader or the like.

[0027] [Structure of dump truck 1]

[0028] like Figure 1 to Figure 3 As shown, the dump truck 1 of this embodiment mainly includes: a frame 2 (body); a pair of front tires 3L, 3R, which are rotatably supported at the left and right ends of the front part of the frame 2; a pair of rear tires 4L, 4R, which are rotatably supported at the left and right ends of the rear part of the frame 2; a cargo box 5, which is supported on the frame 2 in an up-and-down manner; and a cab 6 for the operator who operates the dump truck 1 to ride.

[0029] The pair of front tires 3L and 3R are steering wheels whose steering angles change according to the steering operation of the operator. On the other hand, the pair of rear tires 4L and 4R are driving wheels that rotate when the driving force of the traveling motors 15L and 15R is transmitted. In addition, the dump truck 1 has a pair of traveling motors 15L and 15R in order to independently transmit the driving force to the pair of rear tires 4L and 4R.

[0030] The cargo box 5 rises and falls in the vertical direction around the hinge pin 8 at the rear of the vehicle frame 2 by the extension and contraction of the lift cylinders 7L and 7R. One end of the lift cylinders 7L and 7R is connected to the vehicle frame 2, and the other end is connected to the cargo box 5. The lift cylinders 7L and 7R are supplied with hydraulic oil from a hydraulic pump (not shown) to extend and contract. When the lift cylinders 7L and 7R extend, the cargo box 5 stands up, and when the lift cylinders 7L and 7R contract, the cargo box 5 falls down.

[0031] The cab 6 is disposed at the left end of the deck 9 at the front end of the vehicle frame 2. The cab 6 forms a cabin for an operator who operates the dump truck 1 to ride in. In addition, an operating device 20 (see FIG. 2 ) for operating the dump truck 1 is disposed inside the cab 6. Figure 4 The operator in the cab 6 operates the operating device 20, whereby the dump truck 1 travels (accelerates, brakes, turns), and the cargo box 5 rises and falls.

[0032] Figure 4 2 is a diagram showing the interior of the cab 6. The operating device 20 includes, for example, Figure 4 The operating device 20 includes a steering wheel 21, an accelerator pedal 22, and a brake pedal 23, and also includes a travel lever and a lift lever. In addition, the operating device 20 outputs an operation signal corresponding to the user's operation to a controller 30 (see Figure 6 ).

[0033] The steering wheel 21 is an operating device for indicating the turning direction of the dump truck 1. The accelerator pedal 22 is an operating device for indicating the acceleration of the dump truck 1. The brake pedal 23 is an operating device for indicating the braking of the dump truck 1 (the rear tires 4L, 4R). The travel lever is an operating device for indicating the travel direction (forward position, reverse position, neutral position) of the dump truck 1 when the accelerator pedal 22 is stepped on. The lifting lever is an operating device for indicating the ups and downs (upright position, lying position) of the cargo box 5.

[0034] In addition, if Figure 1 As shown, a driving circuit 10 for driving the dump truck 1 is arranged in the dump truck 1. Among the components of the driving circuit 10, a diesel engine 11, a generator 12, and an exhaust gas purification device 18 are mounted on the vehicle frame 2, travel motors 15L and 15R are mounted on the rear axle, and an AC / DC converter 13, inverters 14L and 14R, a chopper 16, and a grid box 17 are arranged on the floor 9.

[0035] Figure 5 1 is a circuit diagram of a drive circuit 10 mounted on a 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.

[0036] The diesel engine 11 generates a driving force for driving the dump truck 1 by burning fuel (light oil). The generator 12 is connected to the output shaft of the diesel engine 11. The generator 12 receives the driving force of the diesel engine 11 and 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.

[0037] The inverters 14L and 14R convert the DC power output from the AC / DC converter 13 into three-phase AC power and output it to the travel motors 15L and 15R. The travel motors 15L and 15R receive the three-phase AC power from the inverters 14L and 14R and generate driving force for rotating the rear tires 4L and 4R. The driving force of the travel motors 15L and 15R is transmitted to the rear tires 4L and 4R via a speed reducer (not shown), thereby causing the dump truck 1 to travel (accelerate).

[0038] On the other hand, when braking the dump truck 1, the travel motors 15L and 15R operate as electric brakes. The travel motors 15L and 15R operating as electric brakes generate regenerative power and output it to the inverters 14L and 14R. The inverters 14L and 14R convert the three-phase AC regenerative power output from the travel motors 15L and 15R into DC power and output it to the chopper 16.

[0039] The chopper 16 supplies the power output from the AC / DC converter 13 and the inverters 14L and 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 travel motors 15L and 15R into heat for consumption.

[0040] The exhaust gas purification device 18 is provided in the middle of the muffler 19 (exhaust pipe) for discharging the 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 only one of a urea SCR (Selective Catalytic Reduction) system for removing nitrogen oxides (NOx) contained in the exhaust gas flowing in the muffler 19 and a DPF (Diesel Particulate Filter) for removing particulate matter (PM, Particulate Matter) such as black smoke. In addition, the exhaust gas purification device 18 can also remove carbon monoxide and hydrocarbons contained in the exhaust gas flowing in the muffler 19 by using an oxidation catalyst. Particulate matter (PM), nitrogen oxides (NOx), and hydrocarbons (HC) are examples of harmful substances contained in the exhaust gas.

[0041] 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 injects urea into the exhaust gas flowing through the muffler 19, and decomposes the nitrogen oxides contained in the exhaust gas into water and nitrogen using ammonia. In addition, the exhaust gas purification device 18 (DPF) captures particulate matter (PM, such as black smoke) contained in the exhaust gas through a filter, and discharges the exhaust gas from which the PM has been removed into the atmosphere.

[0042] Figure 6 1 is a hardware structure diagram of the dump truck 1. The dump truck 1 has a controller 30. In addition, the controller 30 may include, for example, a DSC (Digital Signal Controller) for controlling the overall operation of the dump truck 1 and an ECU (Engine Control Unit) for controlling the driving of the diesel engine 11. However, in this specification, they are collectively referred to as the "controller 30".

[0043] The controller 30 has a CPU (Central Processing Unit) 31 and a memory 32. The memory 32 is composed of, for example, a ROM (Read Only Memory), a RAM (Random Access Memory), a HDD (Hard Disk Drive), or a combination thereof. The controller 30 implements the processing described below by reading and executing the program code stored in the ROM or the HDD by the CPU 31. The RAM is used as a work area when the CPU 31 executes the program.

[0044] However, the specific structure of the controller 30 is not limited thereto, and may be implemented by hardware such as ASIC (Application Specific Integrated Circuit) or FPGA (Field-Programmable Gate Array).

[0045] 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 , for example, based on an operation signal output from the operation device 20 .

[0046] The controller 30 increases the speed of the diesel engine 11 according to the state of the accelerator pedal 22 being stepped on, outputs the power generated by the generator 12 to the inverters 14L and 14R, and controls the inverters 14L and 14R to increase the speed of the travel motors 15L and 15R. The accelerator pedal 22 outputs an operation signal indicating the amount of stepping (acceleration operation amount). The controller 30 increases the speed of the travel motors 15L and 15R as the amount of stepping indicated by the operation signal increases.

[0047] In addition, the controller 30 reduces the speed of the diesel engine 11 according to the condition that the brake pedal 23 is stepped on, and operates the travel motors 15L and 15R as electric brakes. In addition, when the dump truck 1 is braked, the controller 30 outputs the regenerative power generated by the travel motors 15L and 15R to the chopper 16 through the inverters 14L and 14R. As a result, the regenerative power generated by the travel motors 15L and 15R is converted into heat by the grid box 17 and consumed. The brake pedal 23 outputs an operation signal indicating the stepping amount B (brake operation amount). And, the larger the stepping amount B indicated by the operation signal, the greater the braking force (regenerative power) of the rear tires 4R and 4L by the controller 30.

[0048] In addition, the controller 30 increases or decreases the power generation of the generator 12 within the range of the maximum power generation determined by the rotation speed of the diesel engine 11. More specifically, the controller 30 generates running power supplied to the running motors 15L and 15R and auxiliary power supplied to the auxiliary machines (not shown) mounted on the dump truck 1 through the generator 12. The running power increases or decreases according to the amount of depression of the accelerator pedal 22, for example. The auxiliary power increases or decreases according to the driving or stopping of the auxiliary machine. In addition, in the cleaning process described later, the controller 30 generates additional power P through the generator 12 in addition to the running power and the auxiliary power. L Or the power consumption P R .

[0049] Furthermore, the controller 30 executes Figure 7 or Figure 8 The cleaning treatment shown. The cleaning treatment is a treatment for removing hydrocarbons (HS) deposited on the exhaust gas purification device 18 (urea SCR system). In more detail, when the diesel engine 11 is driven at a low load, hydrocarbons are generated. The hydrocarbons flow in the muffler 19 together with the exhaust gas and accumulate on the surface of the exhaust gas purification device 18. The hydrocarbons accumulated on the surface may become the cause of functional defects of the exhaust gas purification device 18. In addition, the cleaning treatment is a treatment for removing particulate matter (PM) deposited on the exhaust gas purification device 18 (DPF). In more detail, when the diesel engine 11 is driven, PM (for example, black smoke) is generated. The PM flows in the muffler 19 together with the exhaust gas and accumulates on the filter part of the exhaust gas purification device 18. The accumulated PM may become the cause of functional defects of the exhaust gas purification device 18.

[0050] Therefore, 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 during the cleaning process. The temperature of the exhaust gas is increased by increasing the load of the diesel engine 11. Furthermore, by increasing the amount of power generated by the generator 12, the load of the diesel engine 11 becomes larger. In addition, by increasing the speed of the diesel engine 11, the flow rate of the exhaust gas is increased. Furthermore, in order to ensure the flow rate of the exhaust gas required for the cleaning process, the operator may step on the accelerator pedal 22, or the speed of the diesel engine 11 may be adjusted by the controller 30.

[0051] The memory 32 holds a counter. The controller 30 increments the counter when the exhaust temperature of the diesel engine 11 is less than a predetermined value for a predetermined period of time. In addition, the controller 30 decrements the counter when the exhaust temperature of the diesel engine 11 is greater than a predetermined value for a predetermined period of time. The controller 30 performs a cleaning process at a timing when the value of the counter exceeds a threshold value. The controller 30 resets the counter (substitutes 0) when the cleaning process is performed.

[0052] [Cleaning Process of First Embodiment]

[0053] Figure 7 1 is a flowchart of the cleaning process of the first embodiment. First, the controller 30 determines the additional power P of the generator 12 when causing the generator 12 to generate a load required to raise the exhaust gas of the diesel engine 11 to the cleaning temperature. L (S11) In addition, the controller 30 determines the consumable power P that the grid box 17 can additionally consume. R (S12). In addition, the additional power P L And the power consumption P R The value changes according to the travel state of the dump truck 1 .

[0054] The cleaning temperature refers to 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. L The value is obtained by subtracting the running power and the auxiliary power from the required power that the generator 12 should generate in order to generate the load required to raise the exhaust gas to the clean temperature. That is, the required power = running power + auxiliary power + additional power P L In addition, when the total of the running power and the auxiliary power exceeds the required power (that is, the exhaust gas has reached the clean temperature), the additional power P L =0.

[0055] Consumable power P RThe value is obtained by subtracting the regenerative power generated by the travel motors 15L and 15R from the maximum power consumption that the grid box 17 can consume. That is, maximum power consumption = regenerative power + consumable power P R When the travel motors 15L and 15R are driven by the electric power supplied from the generator 12 (ie, powered operation), the electric power P R = Maximum power consumption. In addition, the maximum power consumption is greater than the required power.

[0056] Next, the controller 30 sets the additional power P determined in the previous step S11 to L The consumable power P determined in the previous step S12 R The processing of step S13 is to determine whether the additional power P generated by the generator 12 can be consumed by the grid box 17 when the generator 12 generates the load required to raise the exhaust gas to the clean temperature (i.e., the power required to be generated by the generator 12). L An example of processing.

[0057] Next, the controller 30 sets the consumable power P R To add power P L In the above case (S13: Yes), it is determined that the additional power P can be consumed by the grid box 17. L Furthermore, the controller 30 generates additional power P by the generator 12. L (In other words, the power required for the power generation by the generator 12) (S14). As a result, the exhaust gas rises to the cleaning temperature, and hydrocarbons and the like accumulated on the surface of the exhaust gas purification device 18 are removed (cleaned). In addition, the controller 30 consumes additional power P through the grid box 17. L (S15) Furthermore, the controller 30 may prompt the operator to step on the accelerator pedal 22 through a notification device provided in the cab 6. As a result, the flow rate of the exhaust gas at the clean temperature increases.

[0058] On the other hand, the controller 30 can consume power P R Less than additional power P L In the case of (S13: No), it is determined that the additional power P cannot be consumed by the grid box 17. L Next, the controller 30 adds the additional power P L and the consumable power P R The difference (P L -P R ) and threshold P th For comparison. Threshold P th For example, it is set to the power P which can be consumed when the additional power generation by the generator 12 is performed. R In the case of , the exhaust gas can be raised to a value close to the cleaning temperature.

[0059] Next, in the consumable power P R Less than additional power P L And additional power P L and the consumable power P R The difference is less than the threshold P th In the case of (S13: No, S16: Yes), the controller 30 generates additional power P through the generator 12. R (S17). As a result, the exhaust gas temperature rises to a temperature close to the cleaning temperature. In addition, the controller 30 consumes the additional consumable power P through the grid box 17. R (S18). On the other hand, in the case of the consumable power P R Less than additional power P L And additional power P L and the consumable power P R The difference is the threshold value P th In the above case ( S13 : No, S16 : No), the controller 30 does not execute the processing of steps S17 to S18 , and proceeds to the processing of step S19 .

[0060] Next, the controller 30 determines whether the cleaning of the exhaust gas purification device 18 is completed (S19). The controller 30 may determine that the cleaning is completed, for example, based on the time elapsed since the temperature of the exhaust gas detected by the temperature sensor (not shown) reaches the cleaning temperature. Furthermore, if the controller 30 determines that the cleaning is not yet completed (S19: No), the controller 30 executes the processing after step S11 again. In other words, the controller 30 repeatedly executes the processing of steps S11 to S18 until the cleaning is completed.

[0061] On the other hand, when the controller 30 determines that the cleaning is completed (S19: YES), the cleaning process is terminated. That is, the controller 30 causes the generator 12 to generate running power and auxiliary power, and causes the grid box 17 to consume regenerative power.

[0062] According to the first embodiment, for example, the following effects are achieved.

[0063] According to the first embodiment, the consumable power P R To add power P L In the above case (S13: Yes), even if the generator 12 generates a load required to raise the exhaust gas to the clean temperature (S14), the grid box 17 can consume the additional power P generated by the generator 12. L Here, the grid box 17 is an existing device that has been mounted on the dump truck 1 in the past in order to consume the regenerative electric power. Therefore, it is possible to achieve cleaning of the exhaust gas purifying device 18 while suppressing an increase in weight and cost.

[0064] According to the first embodiment, in the case of the consumable power P R Less than additional power P L And additional power P L and the consumable power P R The difference is less than the threshold P th In the case of (S13: No, S16: Yes), the additional power generation by the generator 12 can consume power P R (S17), thereby, although the cleaning cannot be performed immediately, the exhaust gas can be brought close to the cleaning temperature. R When there is a margin (for example, the brake pedal 23 is released), the time required to raise the exhaust gas to the clean temperature can be shortened.

[0065] On the other hand, when the additional power P L and the consumable power P R The difference is the threshold value P th In the above case (ie, the power consumption P R In the case of small power), even if the additional power generation by the generator 12 consumes power P R , the temperature rise of the exhaust gas is also limited. Therefore, by skipping the processing of steps S17 to S18, it is possible to prevent the deterioration of fuel efficiency. However, the processing of step S16 can be omitted. That is, the controller 30 can also R Less than additional power P L In this case, execute the processing of steps S17 to S18.

[0066] [Cleaning Process of Second Embodiment]

[0067] Figure 8 This is the cleaning process of the second embodiment. In addition, detailed description of the process common to the first embodiment is omitted, and the description will be centered on the differences. The structure of the dump truck 1 of the second embodiment is the same as that of the first embodiment. On the other hand, the cleaning process of the second embodiment is different from that of the first embodiment in that, when the generator 12 generates a load required to raise the exhaust gas to the cleaning temperature, it is determined whether the additional power P generated by the generator 12 can be consumed by the grid box 17. L method (S21).

[0068] First, the controller 30 determines whether the travel motors 15L and 15R generate regenerative power (in other words, whether the brake pedal 23 is depressed) (S21). If the travel motors 15L and 15R generate regenerative power (S21: Yes), the controller 30 waits for the execution of the processing after step S11. On the other hand, if the travel motors 15L and 15R do not generate regenerative power (S21: No), the controller 30 determines that the additional power P can be consumed by the grid box 17.L , execute the processing of steps S11 to S19.

[0069] According to the second embodiment, it is also possible to suppress the increase in weight and cost and achieve the cleaning of the exhaust gas purification device 18. In addition, when the generator 12 is subjected to the load required to raise the exhaust gas to the cleaning temperature, it is determined whether the additional power P generated by the generator 12 can be consumed by the grid box 17. L The method is simplified compared to the first embodiment, and therefore, the processing load of the controller 30 is reduced.

[0070] The above-mentioned embodiments are examples for explaining the present invention, and are not intended to limit the scope of the present invention to these embodiments. A person skilled in the art can implement the present invention in various other forms without departing from the gist of the present invention.

[0071] Explanation of symbols

[0072] 1 Dump Truck

[0073] 2 Frame

[0074] 3L, 3R front tires

[0075] 4L, 4R rear tire

[0076] 5 Cargo Box

[0077] 6 Cab

[0078] 7L, 7R Lift Cylinder

[0079] 8 Hinge pin

[0080] 9 Bottom Plate

[0081] 10. Driving Circuit

[0082] 11 Diesel Engine

[0083] 12 Generator

[0084] 13 AC / DC Converter

[0085] 14L, 14R Inverter

[0086] 15L, 15R Travel Motor

[0087] 16 Chopper

[0088] 17 Grid Box

[0089] 18 Exhaust gas purification device

[0090] 19 Muffler

[0091] 20 Operating device

[0092] 21 Steering Wheel

[0093] 22 Accelerator pedal

[0094] 23 Brake pedal

[0095] 30 Controller

[0096] 31 CPU

[0097] 32 memories.

Claims

1. A transport vehicle having: Diesel engines; a generator that generates electricity using the driving force of the diesel engine; a travel motor that generates a driving force for rotating the tires using the electricity generated by the generator, and generates electricity by braking the tires; a grid box that converts the electric power generated by at least one of the generator and the travel motor into heat for consumption; as well as a controller for controlling the diesel engine, the generator and the travel motor, It is characterized in that The transport vehicle further comprises: an exhaust gas purification device, which removes harmful substances contained in the exhaust gas generated by the diesel engine, When the controller causes the generator to generate the load required to raise the exhaust gas to a clean temperature, the controller determines whether the additional power generated by the generator can be consumed by the grid box. When it is determined that the additional power can be consumed by the grid box, the generator generates the additional power to remove harmful substances accumulated in the exhaust gas purification device, and the additional power is consumed by the grid box.

2. The transport vehicle according to claim 1, characterized in that: The controller determines the additional power and consumable power that can be additionally consumed by the grid box, and determines that the additional power can be consumed by the grid box when the consumable power is equal to or greater than the additional power.

3. The transport vehicle according to claim 2, characterized in that: When the consumable electric power is less than the additional electric power, the controller generates additional electric power by the generator to increase the temperature of the exhaust gas, and consumes additional electric power by the grid box.

4. The transport vehicle according to claim 3, characterized in that: 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 power through the generator to increase the temperature of the exhaust gas and consumes additional power through the grid box.

5. The transport vehicle according to claim 1, characterized in that: The controller determines that the additional electric power can be consumed by the grid box when the travel motor is not generating electric power.

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