Dump truck

Abstract

To provide a dump truck capable of achieving operation evaluation according to desired working conditions.SOLUTION: A dump truck includes: a power source for driving a vehicle body; a sensor which is provided to the vehicle body so as to detect a state quantity of the vehicle body; and an evaluation device for evaluating operation by an operator. The dump truck is configured to travel in a plurality of working modes which differ in output of the power sources. The evaluation device includes an operation evaluation part for evaluating the operation by using the state quantity detected by the sensor and evaluation criteria different according to the working modes.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a dump truck, and more particularly to a dump truck equipped with a driving evaluation device. [Background technology]

[0002] For work machines such as hydraulic excavators and dump trucks, there is a demand for reduced fuel consumption to improve life cycle costs, as well as for efficient work performance. For example, Patent Document 1 describes a technology for evaluating operator skills. In Patent Document 1, for various tasks using a work machine, work performance is calculated from the state quantities of work volume, work time, and fuel consumption to comprehensively evaluate work efficiency and the operator's skill level. Patent Document 1 also describes how the evaluation is presented to the operator to improve work efficiency and skill level. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6430272 specification Summary of the Invention [Problem to be solved by the invention]

[0004] The driving evaluation device disclosed in Patent Document 1 calculates work performance using the amount of work, work time, and fuel consumption. However, the work requirements for a work machine vary depending on the work plan, work environment, and the like. For example, if work is progressing faster than planned, cost reductions such as fuel efficiency and safety may be more important than the amount of work carried out. On the other hand, if work is behind schedule, the amount of work carried out is likely to be the most important requirement. In other words, in order to properly evaluate the operation skills of a work machine, it is preferable to consider what kind of work is being required of the vehicle.

[0005] The present invention has been made in consideration of the above-mentioned problems, and has an object to provide a dump truck that is capable of performing a driving evaluation in accordance with required working conditions. [Means for solving the problem]

[0006] The dump truck of the present invention is a dump truck that is configured to run in a plurality of work modes with different power source outputs, and includes a power source that drives the vehicle body, a sensor provided on the vehicle body that detects the state quantities of the vehicle body, and an evaluation device that evaluates the driving by the operator.The evaluation device includes a driving evaluation unit that evaluates the driving using the state quantities detected by the sensor and evaluation criteria that differ depending on the work mode. [Effects of the Invention]

[0007] According to the present invention, it is possible to provide a dump truck that can perform driving evaluation according to the required working conditions. More specifically, the dump truck evaluation device according to the present invention allows the operator to know the driving evaluation in the current working mode while actually driving the vehicle, and can effectively improve the required work volume and fuel efficiency. Furthermore, in a work machine having a plurality of work modes, it is possible to set different evaluation criteria for each work mode, which is preferable. Further features related to the present invention will become apparent from the description of the present specification and the accompanying drawings. In addition, the problems, configurations, and effects other than those described above will become apparent from the following description of the embodiments. [Brief explanation of the drawings]

[0008] [Figure 1] A schematic diagram to explain the work cycle in a mine. [Figure 2] Side view of a dump truck. [Figure 3] FIG. 2 is a diagram showing the internal structure of a cab in a dump truck. [Figure 4] FIG. 2 is a block diagram showing the hardware configuration of a control system mounted on a dump truck. [Figure 5] FIG. 2 is a functional block diagram showing the functional configuration of a vehicle body controller. [Figure 6] FIG. 4 is a diagram showing control parameters for each work mode. [Figure 7] 10 is a flowchart showing a calculation process executed by the evaluation device. [Figure 8] A diagram showing the relationship between fuel efficiency and points. [Figure 9] FIG. 10 is a diagram showing specific examples of fuel efficiency and scores. [Figure 10] A diagram showing the relationship between work volume and points. [Figure 11] FIG. 10 is a diagram showing a specific example of the relationship between the amount of work and the score. [Figure 12] FIG. 4 is a diagram showing an example of a display on a monitor. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, an embodiment will be described with reference to the drawings. In this embodiment, a dump truck, which is one type of transport vehicle, will be used as an example of the work machine.

[0010] FIG. 1 is a diagram schematically illustrating a mine M1. Using FIG. 1, the work cycle of a dump truck 10 in the mine M1 will be described. First, a shovel LM excavates heavy objects such as crushed stone at a loading site L1. Then, the shovel LM loads the excavated crushed stone into the vessel of the dump truck 10 (loading work). The dump truck 10 loaded with crushed stone travels along a circular route R1 toward a dump site D1 (transportation work).

[0011] The dump truck 10 moves to the dumping site D1 and dumps the loaded crushed stone (dumping work). After completing the dumping work, the dump truck 10 travels along the travel path R2 and moves again to the loading site L1 (traveling work). The dump truck 10 performs one work cycle, which consists of the above-mentioned loading work, transporting work, dumping work, and traveling work, and then returning to the loading site L1, and repeats this work cycle operation. After the entire work cycle is completed (the end of work for the day), the dump truck 10 returns to the garage. Note that this work cycle is often repeated approximately 20 to 40 times a day, although this may vary depending on the work site.

[0012] FIG. 2 is a side view of a dump truck 10. The dump truck 10 has a body frame (vehicle body) 11 and a vessel 12 that is rotatably mounted on the body frame 11 and can store crushed stone 15. The dump truck 10 also has four wheels 13 mounted on the body frame 11 and a cab 14 that is mounted on the body frame 11 and in which an operator rides. More specifically, an engine (power source) 20 that serves as a prime mover and serves as a power source for traveling, and a generator 21 that is directly connected to the engine 20, are provided in the front of the body frame 11. In this embodiment, the dump truck 10 is configured to travel in a plurality of work modes with different power source outputs. The body frame 11 also has a suspension cylinder 16 that measures the weight of crushed stone loaded in the vessel 12, a control cabinet 22 that controls the power generated by the generator 21, and travel motors 23 that are directly connected to the wheels 13, respectively.

[0013] 3 is a diagram showing the interior structure of the cab 14 as seen by an operator sitting in the driver's seat provided inside the cab 14. The cab 14 is located on the left side of the center in the vehicle width direction. In addition to the driver's seat, the cab 14 is also provided with a changeover switch 30 for switching between driving modes, an accelerator pedal 31, a monitor 32, a steering wheel, a shift lever, etc.

[0014] FIG. 4 is a block diagram showing the hardware configuration of a control system mounted on a dump truck according to this embodiment. As shown in FIG. 4, the control system of the dump truck 10 further includes, in addition to the devices described in FIGS. 2 and 3, a vehicle speed sensor (sensor) 13a connected to the wheels 13 and measuring the vehicle speed, a suspension cylinder pressure sensor (sensor) 16a for measuring the pressure of the suspension cylinder 16, an engine controller 20a for controlling the engine 20, and an accelerator pedal depression amount sensor (sensor) 31a for measuring the depression amount of the accelerator pedal 31. A vehicle controller (evaluation device) 40 collects data from these devices, performs various calculations, and outputs the data to a monitor 32. More specifically, the vehicle controller 40 acquires various state quantities measured by the vehicle speed sensor 13a monitoring the wheels 13, the suspension cylinder pressure sensor 16a attached to the suspension cylinder 16, and the accelerator pedal depression amount sensor 31a attached to the accelerator pedal 31. The vehicle controller 40 includes a memory 40a. The memory 40a is a storage device area within the vehicle body controller 40. As will be described later, the memory 40a stores fuel efficiency, work volume, graded driving evaluation of the operator, and state quantities of the vehicle body 11. The vehicle body controller 40 corresponds to the evaluation device in the claims.

[0015] The engine controller 20a controls the engine rotation, and the vehicle body controller 40 outputs to the engine controller 20a the calculation result based on the state quantity output from the accelerator pedal depression amount sensor 31a to the vehicle body controller 40 as the accelerator pedal opening. Also, when the operator operates the changeover switch 30, a signal for switching the work mode is output to the engine controller 20a via the vehicle body controller 40, and the engine rotation speed is controlled to the set value for each mode. Then, the current control device 22a in the control cabinet 22 changes the output of the travel motor 23 depending on the engine rotation speed.

[0016] Fig. 5 is a block diagram showing the functional configuration of the vehicle body controller 40. The vehicle body controller 40 includes a CPU (Central Processing Unit) that calculates parameters necessary for vehicle control based on data, a ROM (Read Only Memory) that is a storage device from which data can be read, and a RAM (Random Access Memory) that can both write and read data, and the functions described below are realized by the CPU expanding and executing a program stored in the ROM into the RAM. As shown in Fig. 5, the vehicle body controller 40 includes, as its functional units, a measurement unit 401, a work amount calculation unit 402, and a driving evaluation unit 403.

[0017] Each time the dump truck 10 completes a work cycle, the measurement unit 401 measures the work time, fuel efficiency, and cargo weight for that work cycle. The work time (h) is obtained from the control cabinet 22, which controls the engine 20 and the travel motor 23. The fuel efficiency (L / h) is calculated using the so-called distance fuel efficiency (L / km), which is a value specific to the vehicle type of the dump truck 10, and the speed (km / h) calculated from the vehicle speed sensor 13a and the accelerator pedal depression amount sensor 31a. The cargo weight (ton) is obtained from the suspension cylinder pressure sensor 16a. Here, as described with reference to FIG. 1, the work cycle refers to a series of operations including a loading operation in which materials such as crushed stone are loaded into a vessel at a loading site, a transport operation in which the materials are transported to a dumping site, an unloading operation in which the materials are unloaded at the unloading site and the vessel is emptied, and a traveling operation in which the vessel travels to the loading site with the vessel empty. Furthermore, switching from one work cycle to the next work cycle is performed when the vessel is empty and the vehicle body is set to a load dump state by an operating device in the cab 14 of the dump truck 10.

[0018] The workload calculation unit 402 calculates the workload, which is the amount of cargo per working time, based on the working time and the amount of cargo measured by the measurement unit 401. Specifically, the workload calculation unit 402 calculates the workload (ton / h) by dividing the weight (ton) of the cargo transported in the completed work cycle by the working time (h) required for the work cycle.

[0019] The driving evaluation unit 403 evaluates the amount of work and fuel efficiency using different evaluation criteria depending on the work mode. The evaluation criteria will be described in detail later. The driving evaluation unit 403 outputs the evaluation results to the monitor 32.

[0020] To summarize the configuration of the dump truck 10 according to this embodiment, the dump truck 10 according to this embodiment includes a power source 20 that drives the vehicle body 11, sensors 13a, 16a, 31a that are provided on the vehicle body 11 and detect state quantities of the vehicle body 11, and an evaluation device 40 that evaluates driving by an operator, and is configured to travel in a plurality of work modes with different power source outputs, and the evaluation device 40 includes a driving evaluation unit 403 that evaluates the driving using the state quantities detected by the sensors 13a, 16a, 31a and evaluation criteria that differ depending on the work mode. The evaluation device 40 further includes a measurement unit 401 that defines a work cycle as loading, transporting, dumping, and traveling, and measures the work time, fuel consumption, and cargo weight for the work cycle based on the state quantities detected by the sensors 13a, 16a, 31a, and a work amount calculation unit 402 that calculates the work amount, which is the cargo weight per work time, based on the work time and the cargo weight.

[0021] As described above, each time a work cycle is completed, the driving evaluation for that work cycle is displayed on the monitor 32, so the operator of the dump truck 10 can refer to the driving evaluation and determine for himself or herself how to drive in the next work cycle.

[0022] The above-mentioned work modes will now be explained. The driving load of the dump truck 10 changes depending on whether or not it is loaded, the depression amount of the accelerator pedal 31, the road surface condition, and the angle of incline on which it is traveling. Conditions in which the driving load is high include traveling with a load, accelerating, traveling on a rough road, and traveling uphill. When the driving load is high, it is necessary to increase the engine output, and when the driving load is low, it is not necessary to increase the engine output. In the present invention, the operator selects the HP (High Power) mode when the driving load is high and priority is given to the workload, the P (Power) mode when the driving load is high and priority is not given to the workload, and the E (Economy) mode when the driving load is low and priority is given to reducing fuel consumption. For example, the following work modes are used: when traveling uphill with a load and there is no preceding vehicle, the HP mode; when traveling uphill with a load and the preceding vehicle is waiting to unload or load, the P mode; and when traveling on a flat road with no load. That is, there are three work modes: HP mode, which prioritizes increasing the amount of work; E mode, which prioritizes fuel economy; and P mode, which achieves both an increase in work amount and fuel economy.

[0023] Various parameters need to be adjusted for each work mode, and there are four types of parameters that can be adjusted, as explained below. (1) High idle engine speed The role of this parameter is to determine the engine speed when the accelerator opening (depression amount of the accelerator pedal 31) is 100%. Therefore, while it particularly affects the driving performance when climbing slopes using the maximum output of the engine 4, it is a parameter that also affects fuel economy. The high idle engine speed is set, for example, to the lowest in E mode, the highest in HP mode, and somewhere in between in P mode. (2) Engine power ratio limit To improve the acceleration (speedup) of the engine 4, electric dump trucks sometimes have a mechanism for switching to an operating mode (acceleration mode) that limits the main generator absorption horsepower when the engine speed increases. By limiting the main generator absorption horsepower, the output of the engine 4 is allocated to increasing the engine speed, thereby improving the acceleration of the engine 4. The engine output ratio limit (acceleration) is a ratio that determines the main generator absorption horsepower in acceleration mode. In other words, the engine output ratio limit is a parameter that determines how much of the power (explosive force) generated by the engine 4 is allocated to the output of the traction motor 23 when the engine speed (target speed) corresponding to the depression amount of the accelerator pedal 31 differs from the actual speed (for example, when the actual speed is lower than the target speed), thereby determining how much (i.e., the remaining power) is allocated to increasing the engine speed. For example, the engine output ratio limit is set to the lowest in E mode, the highest in HP mode, and somewhere in between in P mode. (3) Motor input upper limit The role of this parameter is to limit the absorbed horsepower when the accelerator opening is small in order to improve fine operability. In other words, the motor input upper limit is the limit on the output of the travel motor 23 when the depression amount of the accelerator pedal 31 (and the corresponding rotation speed of the engine 4) is below a predetermined amount (for example, less than 80%). For example, the motor input upper limit is set to be highest in E mode, lowest in HP mode, and somewhere in between in P mode. For example, when the depression amount of the accelerator pedal 31 is small, such as when traveling at a constant speed on flat ground, the output of the travel motor 23 is largely limited in E mode. This makes it possible to travel under output conditions (such as the relationship between engine rotation speed and motor output) that are expected to improve fuel efficiency, regardless of accelerator operation. (4) Standard engine output The role of this parameter is to control the maximum main generator absorption horsepower (upper limit of the output of the travel motor 23) corresponding to the rotation speed of engine 4. The standard engine output is set to the lowest in E mode, the highest in HP mode, and somewhere in between in P mode. In current models, the total engine output (= standard engine output + absorption horsepower of the auxiliary generator, hydraulic pump, and 24V generator) is set to the rated output of engine 4. By appropriately changing the above parameters, it is possible to set the three work modes described above. In other words, the vehicle body controller 40 adjusts one of the above parameters in three stages depending on the work mode. The vehicle body controller 40 may also adjust two, three, or all of the above parameters in three stages depending on the work mode.

[0024] FIG. 6 shows the high idle engine speed, engine output ratio limit, motor input upper limit, and standard engine output controlled for each of the three modes selected by the selector switch 30. As described above, the high idle engine speed sets the upper limit of the engine 4 speed and is an index representing the magnitude of the engine 4 output. The engine output ratio limit is a parameter that determines how much of the power generated by the engine 4 is distributed to the output of the traction motor 23 when the engine 4 speed corresponding to the accelerator pedal 31 depression amount differs from the actual engine 4 speed. The motor input upper limit is an index that represents the actual output of the output value set by the accelerator pedal 31 and relates to the operability of the dump truck 10. Adjusting this motor input upper limit can reduce operation in the low engine output range, which is fuel-efficient, and improve fuel efficiency. The standard engine output is a parameter that determines the upper limit of the output of the traction motor 23 corresponding to the engine 4 speed. In the HP mode, setting the high idle engine speed high increases engine output, making this mode the fastest possible for climbing hills among all modes. In addition, the engine output ratio limit is set high, improving the acceleration of the engine 4. In addition, the motor input upper limit is set low, resulting in a mode that prioritizes work efficiency over fuel efficiency. The standard engine output is set high, increasing the output of the travel motor 23, making this the mode that allows for the fastest climbing of all modes. In E mode, the high idle engine speed is set low, the engine output ratio limit is set low, the motor input upper limit is set high, and the standard engine output is set low, resulting in a mode that prioritizes fuel efficiency over work volume. In P mode, the high idle engine speed, engine output ratio limit, motor input upper limit, and standard engine output are all set between those of HP and E mode, achieving a balance between work volume and fuel efficiency.

[0025] Next, the calculation process executed by the vehicle body controller 40 in this embodiment will be described with reference to the flowchart shown in FIG. First, in step S50, the vehicle body controller 40 determines whether the amount of cargo is equal to or greater than threshold value 1. That is, if crushed stone equal to or greater than threshold value 1 is loaded into the vessel 12 of the dump truck 10 by the excavator LM at the loading site L1 in FIG. 1, the determination here becomes "Yes," and it is determined that the work cycle has started. If the amount of cargo is equal to or greater than threshold value 1, the process proceeds to step S51. If the amount of cargo is less than threshold value 1, the process returns to step S50.

[0026] In step S51, the measurement unit 401 of the vehicle body controller 40 starts acquiring (measuring) each state quantity. Here, the state quantities refer to the fuel efficiency (L / h), cargo amount (ton), and work time (h) as described above. In addition to these values, the mileage (km) may also be acquired (measured). By acquiring the mileage, for example, it is possible to compare the mileage and work time between multiple work cycles, and if the work time in one work cycle is longer than that of another work cycle despite the mileage being approximately the same, it can be determined that a waiting time or the like occurred in that work cycle. This can be used for data analysis.

[0027] Next, in step S52, it is determined whether the amount of cargo is equal to or less than threshold value 2. Threshold value 2 is a value smaller than threshold value 1. This step is a process for determining whether dumping has been performed at the dump site D1 shown in FIG. 1. In other words, if the amount of cargo is equal to or less than predetermined threshold value 2, it is determined that a predetermined amount or more of crushed stone has been dumped from the vessel 12 of the dump truck 10. If the amount of cargo is equal to or less than threshold value 2, the process proceeds to step S53. If the amount of cargo is not equal to or less than threshold value 2, the process returns to step S52.

[0028] In step S53, it is determined whether the key has been turned off. That is, when the work for the day is all completed and the dump truck 10 returns to the garage, the key is turned off to turn off the power to the vehicle body. This means that the dump truck 10 has returned to the garage and stopped operating after discharging crushed stone at the dumping site D1 in FIG. 1. Therefore, in this case, the dump truck 10 does not travel on the travel path R2 from the dumping site D1 to the loading site L1 during the work cycle, and the work cycle is not completed. Therefore, no driving evaluation is performed for this period, and the process is terminated.

[0029] In step S54, it is determined whether the dump truck 10 is empty (a state in which crushed stone is not loaded in the vessel 12) and whether the load dump is on. Here, the load dump is a state that is set by an operating device (shift lever) in the cab 14, and when the dump truck 10 loads crushed stone, it is set to this load dump state rather than parking. Therefore, if the dump truck 10 is empty and in the load dump on state, this means that the dump truck 10 has arrived at the loading site L1 and started loading, that is, one work cycle has ended and the next new work cycle has started. Calculations by the workload calculation unit 402 and the driving evaluation unit 403 start at this timing.

[0030] In step S55, the measurement unit 401 finishes acquiring each state quantity. In step S56, the vehicle controller 40 determines the current work mode based on the output signal output from the changeover switch 30. In step S57, the work amount calculation unit 402 calculates the work amount (ton / h) from the state quantities acquired in step S55, namely, the load amount (ton) and the work time (h). Furthermore, the driving evaluation unit 403 evaluates the fuel efficiency and work amount based on the work mode determined in step S56.

[0031] Here, the details of the driving evaluation method performed by the driving evaluation unit 403 will be explained using Figures 8 to 11. First, Figure 8 shows the relationship between fuel efficiency per work cycle and score in each mode used to score the fuel efficiency in step S57. The horizontal axis shows the fuel efficiency Xα calculated in step S57, and the vertical axis shows the score, and the slope of the graph increases if the factor is prioritized in each mode. Note that on the horizontal axis of Figure 8, the fuel efficiency Xα decreases and the score on the vertical axis increases as you move to the right.

[0032] Figure 9 is a table showing example scores for fuel efficiency X6, X7, and X8 in the graph of Figure 8. For example, when the work mode is P mode and the fuel efficiency is X8, the distance fuel efficiency score calculated in step S56 is 80 points. This table also shows that the increase in score relative to the decrease in fuel efficiency increases in the order of E mode, P mode, and HP mode. Note that the P mode is scored intermediate between the HP mode and E mode.

[0033] Figure 10 shows the relationship between the workload per work cycle and the score in each mode used to score the workload in step S57. The horizontal axis shows the workload Yα calculated in step S57, and the vertical axis shows the score, with the graph's slope increasing if the element is prioritized in each mode. Note that the workload Yα increases and the score on the vertical axis increases as you move to the right on the horizontal axis in Figure 10.

[0034] FIG. 11 is a table showing an example of scores for each mode for the workloads Y6, Y7, and Y8 per work cycle in the graph of FIG. 10. For example, when the work mode is P mode and the workload per work cycle is Y6, the workload score calculated in step S56 is 40 points. This table shows that, contrary to FIG. 9, the increase in score relative to the increase in workload increases in the order HP mode, P mode, and E mode. Note that P mode is scored intermediate between HP mode and E mode.

[0035] As described above, in this embodiment, the driving evaluation unit 403 evaluates an increase in work volume higher than a decrease in fuel efficiency in HP mode, evaluates an increase in work volume and a decrease in fuel efficiency equally in P mode, and evaluates a decrease in fuel efficiency higher than an increase in work volume in E mode.

[0036] After calculating the fuel efficiency and workload points for the current mode, the calculated fuel efficiency and workload points are added together. For example, based on the calculation results shown in Figures 8 to 11, if the work mode is P mode, the fuel efficiency is X8, and the workload is Y6, the total score is 120 points.

[0037] In this way, the driving evaluation unit 403 evaluates the amount of work and fuel efficiency using different evaluation criteria depending on the work mode, and the sum of these evaluations is used as the overall evaluation for that work mode.

[0038] As shown in FIG. 7, in step S58, the calculated fuel efficiency, work amount, the scored total score, and each state quantity acquired in step S55 are stored in memory 40a, which is a storage device area in the vehicle body controller 40.

[0039] In step S59, the evaluation results including the fuel economy, work amount, total score, and each state quantity stored in the memory 40a are output to the monitor 32 upon completion of the calculation by the driving evaluation unit 403.

[0040] Fig. 12 shows an example of the display screen of the monitor 32 in this embodiment. In Fig. 12, the display screen of the monitor 32 displays the evaluation results including the current work mode, fuel consumption, work volume, travel distance, work time, and total score.

[0041] The operator of the dump truck 10 can check the evaluation results of the completed work cycle by referring to the screen shown in Fig. 12 and reflect the evaluation results in the operation of the next work cycle. Note that by displaying this screen immediately after the calculation processing in step S57 of Fig. 7 is completed, the operator can check the evaluation results during loading work.

[0042] The above-described embodiment of the present invention provides the following advantageous effects.

[0043] (1) A dump truck 10 according to an embodiment of the present invention is a dump truck 10 that is configured to travel in a plurality of work modes with different outputs from the power source, and includes a power source 20 that drives the vehicle body 11, sensors 13a, 16a, 31a that are provided on the vehicle body 11 and that detect state quantities of the vehicle body 11, and an evaluation device 40 that evaluates the driving by the operator. The evaluation device 40 includes a driving evaluation unit 403 that evaluates the driving using the state quantities detected by the sensors 13a, 16a, 31a and evaluation criteria that differ depending on the work mode.

[0044] With the above configuration, a dump truck is provided that can perform driving evaluation according to required working conditions.

[0045] (2) The evaluation device 40 defines a work cycle as a loading operation, a transporting operation, a dumping operation, and a traveling operation, and further includes a measurement unit 401 that measures the work time, fuel consumption, and cargo amount in the work cycle based on the state quantities detected by the sensors 13a, 16a, and 31a, and a work amount calculation unit 402 that calculates the work amount, which is the cargo amount per work time, based on the work time and the cargo amount. Specifically, the evaluation device 40 is configured as described above.

[0046] (3) The multiple work modes include HP mode, P mode, and E mode, and the driving evaluation unit 403 evaluates an increase in work volume higher than a decrease in fuel efficiency in HP mode, evaluates an increase in work volume and a decrease in fuel efficiency equally in P mode, and evaluates a decrease in fuel efficiency higher than an increase in work volume in E mode. Specifically, the driving evaluation unit 403 evaluates the operator's operation using evaluation criteria that differ for each work mode.

[0047] (4) The driving evaluation unit 403 evaluates the amount of work and fuel consumption using different evaluation criteria depending on the work mode, and calculates the total of these evaluations as an overall evaluation for that work mode. By using this overall evaluation, it is possible to appropriately evaluate the operation for each work mode.

[0048] (5) The measuring unit 401 also measures the traveled distance. This makes it possible to use the data for data analysis, for example, by comparing the traveled distance and work time between multiple work cycles, and determining that a certain work cycle has a longer work time than another work cycle even though the traveled distance is roughly the same, and that waiting time, etc., occurred in that work cycle.

[0049] (6) The evaluation device 40 determines that the timing when the vessel 12 is empty and the vehicle body 11 is set to the load dump state is the timing to switch work cycles, and executes calculations by the work amount calculation unit 402 and the operation evaluation unit 403. This enables the operator to check the evaluation results of the completed work cycle at the start of or during loading work that enters a new work cycle, and to reflect the evaluation results in the operation of the next work cycle.

[0050] (7) The dump truck 10 according to the embodiment of the present invention further includes a monitor 32, and the evaluation device 40 displays the evaluation result calculated by the driving evaluation unit 403 on the monitor 32 upon completion of the calculation. This allows the operator to refer to the evaluation result and determine for himself how to drive in the next work cycle. For example, the operator can immediately check the driving evaluation during or after loading work, and can use the self-evaluation result for driving in the next cycle.

[0051] The present invention is not limited to the above-described embodiments, and various modifications are possible. For example, the above-described embodiments have been described in detail to clearly explain the present invention, and the present invention is not necessarily limited to embodiments including all of the described configurations. Furthermore, it is possible to replace part of the configuration of one embodiment with the configuration of another embodiment. It is also possible to add the configuration of another embodiment to the configuration of one embodiment. It is also possible to delete part of the configuration of each embodiment, or to add or replace other configurations. [Explanation of symbols]

[0052] 10 Dump truck, 20 Engine (power source), 32 Monitor, 40 Vehicle controller (evaluation device), 401 Measurement unit, 402 Work amount calculation unit, 403 Operation evaluation unit

Claims

1. A power source that drives the vehicle body; a sensor provided on the vehicle body to detect a state quantity of the vehicle body; an evaluation device that evaluates the driving by an operator, A dump truck configured to travel in a plurality of work modes with different outputs of the power source, The evaluation device includes a driving evaluation unit that evaluates driving using the state quantity detected by the sensor and evaluation criteria that differ depending on the work mode. A dump truck characterized by:

2. The dump truck according to claim 1, The evaluation device a measurement unit that measures a work cycle consisting of loading work, transporting work, dumping work, and traveling work, and measures a work time, fuel consumption, and cargo amount in the work cycle based on the state quantities detected by the sensors; a work amount calculation unit that calculates a work amount, which is the cargo amount per work time, based on the work time and the cargo amount, A dump truck characterized by:

3. The dump truck according to claim 2, the plurality of working modes include an HP mode, a P mode, and an E mode; The driving evaluation unit evaluates the increase in the amount of work higher than the decrease in fuel efficiency in the HP mode, evaluates the increase in the amount of work and the decrease in fuel efficiency to the same extent in the P mode, and evaluates the decrease in fuel efficiency higher than the increase in the amount of work in the E mode. A dump truck characterized by:

4. The dump truck according to claim 2, the driving evaluation unit evaluates each of the work amount and the fuel efficiency using evaluation criteria that differ depending on the work mode, and calculates a total of the evaluations as an overall evaluation for the work mode. A dump truck characterized by:

5. The dump truck according to claim 2, The measurement unit further measures a traveled distance. A dump truck characterized by:

6. The dump truck according to claim 2, the evaluation device determines that a timing when the vessel is empty and the vehicle body is set to a load dump state is a timing to switch the work cycle, and executes calculations by the work amount calculation unit and the driving evaluation unit. A dump truck characterized by:

7. The dump truck according to claim 1, further comprising a monitor; The evaluation device displays the evaluation result calculated by the driving evaluation unit on the monitor upon completion of the calculation. A dump truck characterized by:

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