System and method for assessing work machine performance - Patents.com

Abstract

To accurately calculate a torque ratio in a work machine. [Solution] The system is a system for evaluating the performance of a work machine and includes a target torque acquisition unit, an actual torque acquisition unit, a torque correction unit, and a torque ratio calculation unit. The target torque acquisition unit acquires a target output torque of the engine. The actual torque acquisition unit acquires an actual output torque of the engine. The torque correction unit acquires a first change amount of a first correction parameter that changes the target output torque of the engine. The torque correction unit corrects the acquired actual output torque based on the first change amount. The torque ratio calculation unit calculates the ratio between the target output torque and the corrected actual output torque as a torque ratio for evaluating the performance of the engine.

Description

[Technical field]

[0001] The present disclosure relates to systems and methods for assessing the performance of a work machine. [Background technology]

[0002] Conventionally, there is known a method for evaluating engine performance based on the torque ratio of the engine. The torque ratio of the engine is the ratio between the target output torque and the actual output torque of the engine. The torque ratio indicates the magnitude of deviation of the actual output torque from the target output torque of the engine. Therefore, the performance of the engine can be evaluated based on the torque ratio.

[0003] In order to properly evaluate the performance of an engine, it is necessary to calculate the torque ratio with high accuracy. Therefore, the torque ratio is calculated based on data acquired when a predetermined condition is satisfied. For example, in the abnormality determination device for a vehicle disclosed in Patent Document 1, the actual output torque of the engine is calculated based on data acquired when the fuel pressure of the engine is kept constant. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2013-184512 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the above-mentioned vehicle abnormality determination device, the actual output torque of the engine is calculated from data acquired when the vehicle is in a stable state. This makes it possible to calculate the torque ratio with high accuracy. In addition, by making the predetermined conditions stricter, the accuracy of the calculation of the torque ratio can be further improved.

[0006] However, in a work machine used at a work site such as a mine, there are few cases where the torque ratio can be calculated in a stable state compared to the above-mentioned vehicle. Therefore, if an attempt is made to improve the accuracy of the torque ratio calculation by making the specified conditions stricter, the amount of data that can be used for performance evaluation will be reduced. Therefore, it is not easy to improve the accuracy of the performance evaluation. An object of the present disclosure is to accurately calculate the torque ratio in a work machine. [Means for solving the problem]

[0007] A system according to a first aspect of the present disclosure is a system for evaluating the performance of a work machine. The work machine includes an engine. The system according to the first aspect includes a target torque acquisition unit, an actual torque acquisition unit, a torque correction unit, and a torque ratio calculation unit. The target torque acquisition unit acquires a target output torque of the engine. The actual torque acquisition unit acquires an actual output torque of the engine. The torque correction unit acquires a first change amount of a first correction parameter that changes the target output torque of the engine. The torque correction unit corrects the actual output torque based on the first change amount. The torque ratio calculation unit calculates a ratio between the target output torque and the corrected actual output torque as a torque ratio for evaluating performance.

[0008] In the system according to this aspect, the actual output torque is corrected based on the first change amount. The first change amount indicates the change amount of the first correction parameter that changes the target output torque of the engine. Therefore, the actual output torque is corrected taking into account the change in the operating state of the engine. This makes it possible to accurately calculate the torque ratio in the work machine.

[0009] A system according to a second aspect of the present disclosure is a system for evaluating the performance of a work machine. The work machine includes an engine and a torque converter connected to the engine. The system according to the second aspect includes a target torque acquisition unit, an actual torque acquisition unit, a torque correction unit, and a torque ratio calculation unit. The target torque acquisition unit acquires a target output torque of the engine. The actual torque acquisition unit acquires an input torque to the torque converter as an actual output torque of the engine. The torque correction unit acquires an amount of change in a predetermined correction parameter indicating an operating state of the torque converter. The torque correction unit corrects the actual output torque based on the amount of change. The torque ratio calculation unit calculates a ratio between the target output torque and the corrected actual output torque as a torque ratio for evaluating performance.

[0010] In the system according to this aspect, the actual output torque is corrected based on the amount of change in a predetermined correction parameter. The predetermined correction parameter indicates the operating state of the torque converter. Therefore, the actual output torque is corrected taking into account the change in the operating state of the torque converter. This makes it possible to accurately calculate the torque ratio in the work machine.

[0011] A method according to a third aspect of the present disclosure is a method for evaluating the performance of a work machine. The work machine includes an engine. The method according to the third aspect includes acquiring a target output torque of the engine, acquiring an actual output torque of the engine, acquiring a first change amount of a first correction parameter that changes the target output torque of the engine, correcting the actual output torque based on the first change amount, and calculating a ratio between the target output torque and the corrected actual output torque as a torque ratio for evaluating the performance.

[0012] In the method according to this aspect, the actual output torque is corrected based on the first change amount. The first change amount indicates the change amount of the first correction parameter that changes the target output torque of the engine. Therefore, the actual output torque is corrected taking into account the change in the operating state of the engine. This makes it possible to accurately calculate the torque ratio in the work machine.

[0013] A method according to a fourth aspect of the present disclosure is a method for evaluating the performance of a work machine. The work machine includes an engine and a torque converter connected to the engine. The method according to the fourth aspect includes acquiring a target output torque of the engine, acquiring an input torque to the torque converter as an actual output torque of the engine, acquiring an amount of change in a predetermined correction parameter indicating an operating state of the torque converter, correcting the actual output torque based on the amount of change, and calculating a ratio between the target output torque and the corrected actual output torque as a torque ratio for evaluating the performance.

[0014] In the system according to this aspect, the actual output torque is corrected based on the amount of change in a predetermined correction parameter. The predetermined correction parameter indicates the operating state of the torque converter. Therefore, the actual output torque is corrected taking into account the change in the operating state of the torque converter. This makes it possible to accurately calculate the torque ratio in the work machine. Effect of the Invention

[0015] According to the present disclosure, the torque ratio can be calculated with high accuracy in a work machine. [Brief description of the drawings]

[0016] [Figure 1] 1 is a perspective view of a work machine according to an embodiment. FIG. [Diagram 2] 1 is a block diagram showing the configuration of a work machine and a system for evaluating the performance of the work machine. [Diagram 3] 1 is a table showing the configuration of machine data. [Figure 4] FIG. 2 is a block diagram showing a configuration of a server. [Diagram 5] 13 is a flowchart showing a process for generating judgment data for evaluating performance. [Figure 6] FIG. 4 is a diagram showing an example of primary torque coefficient data. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0017] Hereinafter, an embodiment will be described with reference to the drawings. FIG. 1 is a perspective view of a work machine 1 according to an embodiment. The work machine 1 according to this embodiment is a dump truck. As shown in FIG. 1, the work machine 1 includes a vehicle body 2 and a traveling device 3. The vehicle body 2 includes a bed 6 and a driver's cab 7. The traveling device 3 is attached to the vehicle body 2. The traveling device 3 includes running wheels 4, 5.

[0018] Fig. 2 is a block diagram showing the configuration of a work machine 1 and a system for evaluating the performance of the work machine 1. As shown in Fig. 2, the work machine 1 is equipped with an engine 11, a PTO (power take-off) 12, a torque converter 13, and a transmission 14. The engine 11 is, for example, a diesel engine. A fuel injection device 15 is connected to the engine 11. The fuel injection device 15 injects fuel into the engine 11. A radiator 17 is connected to the engine 11 via a cooling pipe 16. The radiator 17 cools the coolant for the engine 11.

[0019] The torque converter 13 is connected to the engine 11 via the PTO 12. The torque converter 13 transmits driving force from the engine 11 to the transmission 14. A lock-up clutch 18 is connected to the torque converter 13. The lock-up clutch 18 is switched between an engaged state and a disengaged state. In the engaged state, the lock-up clutch 18 directly connects the input side and the output side of the torque converter 13.

[0020] The transmission 14 is connected to the torque converter 13. The transmission 14 transmits driving force from the torque converter 13 to the traveling device 3. This drives the traveling device 3, causing the work machine 1 to travel. The transmission 14 includes a plurality of speed change gears, a forward gear, a reverse gear, and a clutch. The clutch switches the engagement of each gear. The transmission 14 is capable of switching between a plurality of speed stages by switching the engagement of the plurality of speed change gears. The transmission 14 is capable of switching between, for example, three or more speed stages.

[0021] The work machine 1 includes a hydraulic pump 19 and an actuator 20. The hydraulic pump 19 is connected to the engine 11 via the PTO 12. The hydraulic pump 19 is driven by the engine 11 to discharge hydraulic oil. The actuator 20 is driven by the hydraulic oil from the hydraulic pump 19. The actuator 20 includes, for example, a steering actuator for steering the running wheels 4. Note that, although only one hydraulic pump 19 is illustrated in FIG. 2, the work machine 1 may be provided with a plurality of hydraulic pumps. Although only one actuator 20 is illustrated in FIG. 2, the work machine 1 may be provided with a plurality of actuators.

[0022] The work machine 1 is equipped with an accelerator operation device 21, an FR operation device 22, and a steering operation device 23. The accelerator operation device 21 can be operated by an operator to adjust the vehicle speed of the work machine 1. The accelerator operation device 21 includes, for example, an accelerator pedal. Alternatively, the accelerator operation device 21 may include a lever or a switch. The accelerator operation device 21 outputs an accelerator operation signal indicating operation to the accelerator operation device 21.

[0023] The FR operation device 22 can be operated by an operator to switch between forward and reverse movement of the work machine 1. The FR operation device 22 includes, for example, an FR lever. Alternatively, the FR operation device 22 may include a switch. The FR operation device 22 outputs an FR operation signal that indicates an operation to the FR operation device 22.

[0024] The steering operation device 23 can be operated by an operator to steer the work machine 1. The steering operation device 23 includes, for example, a steering wheel. Alternatively, the steering operation device 23 may include a lever or a switch. The steering operation device 23 outputs a steering operation signal that indicates an operation to the steering operation device 23.

[0025] The work machine 1 includes an engine rotation speed sensor 24 and an output rotation speed sensor 25. The engine rotation speed sensor 24 detects the engine rotation speed. The output rotation speed sensor 25 detects the output rotation speed of the transmission 14.

[0026] The work machine 1 includes a coolant temperature sensor 26. The coolant temperature sensor 26 detects the temperature of the coolant for the engine 11. The work machine 1 includes a steering angle sensor 27. The steering angle sensor 27 detects the steering angle of the running wheels 4.

[0027] The work machine 1 is equipped with a controller 30. The controller 30 controls the work machine 1. The controller 30 includes a storage device 31 and a processor 32. The storage device 31 includes memories such as RAM and ROM. The storage device 31 may include storage such as an HDD or SSD. The storage device 31 stores programs and data for controlling the work machine 1. The processor 32 is, for example, a CPU. The processor 32 executes processing for controlling the work machine 1 in accordance with the programs and data.

[0028] The controller 30 obtains the engine rotation speed from the engine rotation speed sensor 24. The controller 30 obtains the output rotation speed of the transmission 14 from the output rotation speed sensor 25. The controller 30 obtains the temperature of the coolant of the engine 11 from the coolant temperature sensor 26. The controller 30 obtains the steering angle of the running wheels 4 from the steering angle sensor 27.

[0029] The controller 30 receives an accelerator operation signal from the accelerator operation device 21. The controller 30 determines a target rotation speed of the engine 11 in response to the accelerator operation signal. The controller 30 controls the amount of fuel injected from the fuel injection device 15 in response to the accelerator operation signal. Note that the amount of fuel injected from the fuel injection device 15 may be directly controlled in response to the operation of the accelerator operation device 21, without relying on the controller 30.

[0030] The controller 30 receives an FR operation signal from the FR operation device 22. The controller 30 switches the transmission 14 between forward and reverse in response to the FR operation signal. Note that the transmission 14 may be switched between forward and reverse directly in response to the operation of the FR operation device 22, without relying on the controller 30.

[0031] The controller 30 switches the speed stage of the transmission 14 in response to the vehicle speed or the engine rotation speed. The controller 30 calculates the vehicle speed, for example, from the output rotation speed of the transmission 14. The controller 30 switches the lock-up clutch 18 between engagement and disengagement in response to the vehicle speed or the engine rotation speed.

[0032] The controller 30 receives a steering operation signal from the steering operation device 23. The controller 30 controls the actuator 20 in response to the steering operation signal so as to change the steering angle of the running wheels 4. Note that the actuator 20 may be directly controlled in response to the operation of the steering operation device 23, without relying on the controller 30.

[0033] The work machine 1 is equipped with a communication device 33. The communication device 33 is communicatively connected to the controller 30. The communication device 33 communicates with a server 40 external to the work machine 1 via wireless communication. The server 40 remotely monitors the status of the work machine 1 using machine data indicating the status of the work machine 1.

[0034] The server 40 includes a storage device 41 and a processor 42. The storage device 41 includes memories such as RAM and ROM. The storage device 41 may include storage such as an HDD or SSD. The storage device 41 stores programs and data for monitoring the status of the work machine 1. The processor 42 is, for example, a CPU. The processor 42 executes processing for monitoring the status of the work machine 1 in accordance with the programs and data.

[0035] The controller 30 of the work machine 1 transmits machine data to the server 40 via the communication device 33. Fig. 3 is a table showing the configuration of the machine data. As shown in Fig. 3, the machine data includes the output rotation speed of the transmission 14, the speed stage of the transmission 14, lockup on / off, the engine rotation speed, the target output torque of the engine 11, the steering angle, the operating time, and the temperature of the coolant for the engine 11.

[0036] Lockup on means that the lockup clutch 18 is in an engaged state. Lockup off means that the lockup clutch 18 is in a disengaged state. The target output torque of the engine 11 is calculated based on the rotation speed and fuel injection amount of the engine 11. The operating time is, for example, an integrated value of the time during which the engine 11 is driven. The controller 30 counts and records the operating time.

[0037] The work machine 1 samples the above-mentioned data at predetermined sampling periods and stores it in the storage device 31 as machine data. The work machine 1 transmits the accumulated machine data to the server 40 at a predetermined transmission timing. For example, the work machine 1 transmits the accumulated machine data to the server 40 when it enters a communication area such as a wireless LAN. The server 40 generates judgment data for evaluating the performance of the work machine 1 based on the received machine data. The process by the server 40 for generating judgment data for evaluating performance will be described below.

[0038] Fig. 4 is a block diagram showing the configuration of the server 40. As shown in Fig. 4, the server 40 includes a machine data receiving unit 51, a target torque obtaining unit 52, an actual torque obtaining unit 53, a torque correction unit 54, a torque ratio calculating unit 55, a filtering unit 56, a judgment data generating unit 57, and a judgment data output unit 58. The machine data receiving unit 51, the target torque obtaining unit 52, the actual torque obtaining unit 53, the torque correction unit 54, the torque ratio calculating unit 55, the filtering unit 56, the judgment data generating unit 57, and the judgment data output unit 58 are realized by the processor 42 of the server 40.

[0039] Fig. 5 is a flowchart showing a process for generating judgment data for evaluating performance. As shown in Fig. 5, in step S101, the machine data receiving unit 51 receives machine data. The machine data receiving unit 51 receives the above-mentioned machine data from the controller 30 of the work machine 1. In step S102, the target torque obtaining unit 52 obtains the target output torque of the engine 11. The target torque obtaining unit 52 obtains the target output torque of the engine 11 from the machine data received from the controller 30 of the work machine 1.

[0040] In step S103, the actual torque obtaining unit 53 obtains the actual output torque of the engine 11. Here, the actual output torque of the engine 11 means the part of the total actual output torque of the engine 11 that is supplied to the torque converter 13. A part of the actual output torque of the engine 11 (hereinafter referred to as PTO transmission torque) is supplied to the hydraulic pump 19 via the PTO 12. The actual torque obtaining unit 53 obtains the input torque to the torque converter 13 as the actual output torque. In detail, the actual torque obtaining unit 53 calculates the primary torque coefficient of the torque converter 13 based on the speed ratio of the torque converter 13. The actual torque obtaining unit 53 calculates the input torque to the torque converter 13 based on the primary torque coefficient and the input rotation speed of the torque converter 13.

[0041] The primary torque coefficient indicates the characteristics of the torque converter 13. The relationship between the primary torque coefficient of the torque converter 13 and the input torque to the torque converter 13 is expressed by the following equation (1). Tp is the primary torque coefficient. Ttci is the input torque to the torque converter 13. Ti is the input rotation speed of the torque converter 13. TIFF0007612775000002.tif12133From the above formula (1), the input torque Ttci to the torque converter 13 is expressed by the following formula (2). Note that Ne is the engine rotation speed and corresponds to the input rotation speed Ti of the torque converter 13. The actual torque obtaining unit 53 calculates the input torque Ttci to the torque converter 13 based on the primary torque coefficient Tp and the engine rotation speed Ne using formula (2). 6 , and calculates the primary torque coefficient Tp based on the speed ratio of the torque converter 13. The primary torque coefficient data indicates the relationship between the primary torque coefficient of the torque converter 13 and the speed ratio of the torque converter 13. The primary torque coefficient data is obtained in advance by a simulation, a bench test, or the like, and is stored in the storage device 41.

[0042] The speed ratio of the torque converter 13 is the ratio between the input rotation speed and the output rotation speed of the torque converter 13. The actual torque acquisition unit 53 acquires the input rotation speed and the output rotation speed of the torque converter 13 from the above-mentioned machine data to calculate the speed ratio. In detail, the actual torque acquisition unit 53 acquires the engine rotation speed as the input rotation speed of the torque converter 13. The actual torque acquisition unit 53 calculates the output rotation speed of the torque converter 13 based on the output rotation speed of the transmission 14 and the speed stage of the transmission 14. Alternatively, the actual torque acquisition unit 53 may directly acquire the output rotation speed of the torque converter 13 as machine data.

[0043] In step S104, the torque correction unit 54 corrects the actual output torque of the engine 11 acquired in step S103. The torque correction unit 54 corrects the actual output torque by the following equation (3). Tcicorr is the corrected actual output torque. Te is a first correction parameter that changes the target output torque of the engine 11. In this embodiment, Te is the target output torque of the engine 11. Ntm is a second correction parameter that indicates the operating state of the torque converter 13. In this embodiment, Ntm is the output rotation speed of the torque converter 13. TIFF0007612775000004.tif9154 The torque correction unit 54 corrects the actual output torque Tp based on the first change amount and the second change amount. The first change amount indicates the change amount of the first correction parameter over time. The second change amount indicates the change amount of the second correction parameter over time. As shown in the formula (3), in this embodiment, the first change amount is a time differential value of the target output torque Te. The second change amount is a time differential value of the output rotation speed Ntm of the torque converter 13.

[0044] The torque correction unit 54 acquires the target output torque Te of the engine 11 and the output rotation speed Ntm of the torque converter 13 from the machine data. α and β are predetermined coefficients. α and β are obtained in advance by simulation or bench testing, etc., and are stored in the storage device 41. Alternatively, α and β may be estimated from the actual operating record of the work machine 1.

[0045] In step S105, the torque ratio calculation unit 55 calculates the torque ratio. The torque ratio calculation unit 55 calculates the torque ratio by the following equation (4). That is, the torque ratio calculation unit 55 calculates the ratio between the target output torque Te and the corrected actual output torque Tcicorr as the torque ratio Rt for evaluating the performance of the engine 11 or the torque converter 13. γ is a predetermined coefficient. γ is determined taking into consideration the PTO transmission torque. γ is obtained in advance by a simulation, a bench test, or the like, and is stored in the storage device 41. Alternatively, γ may be estimated from the actual operating record of the work machine 1. TIFF0007612775000005.tif11154 In step S106, the filtering unit 56 filters the torque ratio calculated in step S105. The filtering unit 56 selects the acquired torque ratio if it satisfies predetermined conditions. The predetermined conditions include the following first to ninth conditions.

[0046] The first condition is that the speed stage of the transmission 14 is a predetermined speed stage. For example, the filtering unit 56 determines that the first condition is satisfied when the speed stage of the transmission 14 is forward first speed, forward second speed, or reverse first speed. The second condition is that the speed stage of the transmission 14 is not changed. The third condition is that the lockup is off. The fourth condition is that the engine rotation speed is equal to or higher than a predetermined lower limit. The fifth condition is that the target output torque of the engine 11 is within a predetermined range. The sixth condition is that the speed ratio of the torque converter 13 is within a predetermined range. The seventh condition is that the steering angle is within a predetermined range. The eighth condition is that the change in the steering angle is within a predetermined range. The ninth condition is that the temperature of the coolant of the engine 11 is equal to or higher than a predetermined lower limit.

[0047] The filtering unit 56 judges whether the first to ninth conditions are satisfied based on the above-mentioned machine data. The filtering unit 56 selects the torque ratio that satisfies all of the first to ninth conditions. The filtering unit 56 excludes the torque ratio that does not satisfy at least one of the first to ninth conditions.

[0048] In step S107, the judgment data generating unit 57 generates judgment data. The judgment data generating unit 57 generates judgment data for evaluating performance by recording the torque ratios selected in step S106 in chronological order. For example, the judgment data generating unit 57 calculates an average value of the torque ratios for each predetermined operating time, and generates time-series data of the average torque ratios as judgment data.

[0049] In step S108, the determination data output unit 58 outputs the determination data. For example, the determination data output unit 58 transmits the determination data to a computer of the user of the work machine 1. Alternatively, the determination data output unit 58 may cause the determination data to be displayed on a display by an application for managing the work machine 1.

[0050] The server 40 may evaluate the performance of the engine 11 or the torque converter 13 based on the judgment data. The judgment data output unit 58 may transmit the evaluation result of the performance of the engine 11 or the torque converter 13 judged based on the judgment data to a computer of the user of the work machine 1. For example, the server 40 may determine that a sudden performance degradation has occurred in the engine 11 or the torque converter 13 when the torque ratio suddenly drops in the judgment data. The server 40 may determine that a performance degradation due to aging has occurred in the engine 11 or the torque converter 13 when the torque ratio is equal to or lower than a predetermined threshold value in the judgment data.

[0051] In the system for evaluating the performance of the work machine 1 according to this embodiment described above, the actual output torque of the engine 11 is corrected based on the time differential value of the target output torque of the engine 11 and the time differential value of the output rotation speed of the torque converter 13. Therefore, the actual output torque is corrected taking into consideration fluctuations in the load on the work machine 1, or changes in the operating state of the engine 11 and changes in the operating state of the torque converter 13 in response to operation of the accelerator operating device 21. This makes it possible to accurately calculate the torque ratio in the work machine 1.

[0052] Although one embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and various modifications are possible without departing from the gist of the invention.

[0053] The work machine 1 is not limited to a dump truck, and may be other machines such as a bulldozer, a shovel, a wheel loader, or a grader. The dump truck is not limited to a rigid dump truck, and may be an articulated dump truck. The traveling device 3 is not limited to the running wheels 4, and may include tracks. The work machine 1 may be equipped with a plurality of controllers. The control by the controller 30 of the work machine 1 described above may be distributed and executed by a plurality of controllers.

[0054] The work machine 1 may be capable of being operated remotely. In that case, the accelerator operation device 21, the FR operation device 22, and the steering operation device 23 may be disposed outside the work machine 1. The work machine 1 may be capable of autonomous traveling. In that case, the accelerator operation signal, the FR operation signal, and the steering operation signal may be automatically generated by the controller 30.

[0055] The process for generating the judgment data described above may be executed by the controller 30 of the work machine 1. Alternatively, the process for generating the judgment data described above may be distributed and executed by the controller 30 of the work machine 1 and the server 40. Evaluation of the performance of the engine 11 or the torque converter 13 may be executed by the controller 30 of the work machine 1. The controller 30 may cause the evaluation of the performance of the engine 11 or the torque converter 13 to be displayed on a display of the work machine 1.

[0056] The process for generating the judgment data is not limited to that of the above embodiment and may be changed. For example, the first correction parameter is not limited to the target output torque of the engine 11. The first correction parameter may be the fuel injection amount, the instantaneous fuel consumption amount, the operation amount of the accelerator operation device 21, or the throttle opening. The second correction parameter is not limited to the output rotation speed of the torque converter 13. For example, the second correction parameter may be the input rotation speed of the torque converter 13. The first change amount and the second change amount are not limited to differential values ​​and may be changed. For example, the first change amount and the second change amount may be a change amount per a predetermined unit time.

[0057] The input torque to the torque converter 13 may be estimated by other methods than the primary torque coefficient. For example, the input torque to the torque converter 13 may be estimated by means of a formula, a table, a map, or the like based on the input rotation speed and the output rotation speed of the torque converter 13.

[0058] The predetermined conditions for filtering the torque ratio are not limited to those in the above embodiment and may be changed. Some of the first to ninth conditions described above may be omitted or changed. For example, the predetermined conditions may include a condition for filtering based on the hydraulic oil temperature. The machine data are not limited to those in the above embodiment and may be changed. For example, in the case where the work machine 1 is equipped with a sensor that detects the output rotation speed of the torque converter 13, the machine data may include the detected output rotation speed of the torque converter 13. [Industrial Applicability]

[0059] According to the present disclosure, the torque ratio can be calculated with high accuracy in a work machine. [Explanation of symbols]

[0060] 1: Work machine 11: Engine 13: Torque converter 52: Target torque acquisition unit 53: Actual torque acquisition section 54: Torque correction unit 55: Torque ratio calculation unit 56: Filtering section 57: Judgment data generation unit

Claims

1. 1. A system for evaluating performance of a work machine including an engine, comprising: a target torque acquisition unit that acquires a target output torque of the engine; an actual torque acquisition unit that acquires an actual output torque of the engine; a torque correction unit that obtains a first change amount of a first correction parameter that changes a target output torque of the engine, and corrects the actual output torque based on the first change amount; a torque ratio calculation unit that calculates a ratio between the target output torque and the corrected actual output torque as a torque ratio for evaluating the performance; A system comprising:

2. The first correction parameter is the target output torque. The system of claim 1 .

3. The first change amount is a time differential value of the target output torque. The system of claim 2.

4. The work machine includes a torque converter connected to the engine. The actual torque acquisition unit acquires, as the actual output torque, an input torque to the torque converter calculated based on an input rotation speed and / or an output rotation speed of the torque converter. The system of claim 1 .

5. The actual torque acquisition unit is obtaining a speed ratio, which is a ratio between the input rotational speed and the output rotational speed of the torque converter; Calculating a primary torque coefficient of the torque converter based on the speed ratio; calculating an input torque to the torque converter based on the primary torque coefficient; The system of claim 4.

6. The torque correction unit obtains a second change amount of a second correction parameter indicating an operating state of the torque converter, and corrects the actual output torque based on the second change amount. The system of claim 4.

7. The second correction parameter is the input rotation speed or the output rotation speed of the torque converter. The system of claim 6.

8. the second change amount is a time differential value of the input rotation speed or the output rotation speed of the torque converter; The system of claim 7.

9. A filtering unit is further provided to filter the acquired torque ratio when a predetermined condition is satisfied, The predetermined condition includes a target output torque of the engine being within a predetermined range. The system of claim 1 .

10. A filtering unit is further provided to filter the acquired torque ratio when a predetermined condition is satisfied, the predetermined condition includes a speed ratio, which is a ratio between the input rotation speed and the output rotation speed of the torque converter, being within a predetermined range. The system of claim 4.

11. A judgment data generating unit generates data for evaluating the performance by recording the torque ratio in chronological order. The system of claim 1 .

12. 1. A system for evaluating performance of a work machine including an engine and a torque converter connected to the engine, comprising: a target torque acquisition unit that acquires a target output torque of the engine; an actual torque acquisition unit that acquires an input torque to the torque converter as an actual output torque of the engine; a torque correction unit that obtains a change amount of a predetermined correction parameter that indicates an operating state of the torque converter, and corrects the actual output torque based on the change amount; a torque ratio calculation unit that calculates a ratio between the target output torque and the corrected actual output torque as a torque ratio for evaluating the performance; A system comprising:

13. The actual torque obtaining unit calculates an input torque to the torque converter based on an input rotation speed and / or an output rotation speed of the torque converter. The system of claim 12.

14. The actual torque acquisition unit is obtaining a speed ratio, which is a ratio between the input rotational speed and the output rotational speed of the torque converter; Calculating a primary torque coefficient of the torque converter based on the speed ratio; calculating an input torque to the torque converter based on the primary torque coefficient; The system of claim 13.

15. The predetermined correction parameter is an input rotation speed or an output rotation speed of the torque converter. The system of claim 12.

16. The change amount is a time differential value of the input rotation speed or the output rotation speed of the torque converter. The system of claim 15.

17. A judgment data generating unit generates data for evaluating the performance by recording the torque ratio in chronological order. The system of claim 12.

18. 1. A method for evaluating performance of a work machine including an engine, comprising: Obtaining a target output torque of the engine; Obtaining an actual output torque of the engine; acquiring a first change amount of a first correction parameter that changes a target output torque of the engine, and correcting the actual output torque based on the first change amount; calculating a ratio between the target output torque and the corrected actual output torque as a torque ratio for evaluating the performance; A method for providing the above.

19. 1. A method for evaluating performance of a work machine including an engine and a torque converter connected to the engine, comprising: Obtaining a target output torque of the engine; Obtaining an input torque to the torque converter as an actual output torque of the engine; acquiring a change amount of a predetermined correction parameter indicating an operating state of the torque converter, and correcting the actual output torque based on the change amount; calculating a ratio between the target output torque and the corrected actual output torque as a torque ratio for evaluating the performance; A method for providing the above.

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