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

Abstract

To accurately calculate the deviation degree of charge pressure in a work machine. [Solution] The system includes an actual charge pressure acquisition unit, a target torque acquisition unit, an engine rotation speed acquisition unit, a charge pressure estimation unit, a charge pressure correction unit, and a deviation calculation unit. The actual charge pressure acquisition unit acquires the actual charge pressure. The target torque acquisition unit acquires a target output torque of the engine. The engine rotation speed acquisition unit acquires the actual rotation speed of the engine. The charge pressure estimation unit calculates an estimated charge pressure based on the target output torque and the actual rotation speed. The charge pressure correction unit acquires an amount of change of a predetermined correction parameter that changes the target output torque as a first torque change amount. The charge pressure correction unit corrects the estimated charge pressure based on the first torque change amount. The deviation calculation unit calculates the degree of deviation between the actual charge pressure and the corrected estimated charge pressure.

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 the performance of a turbocharger based on the degree of deviation between the actual charge pressure of the turbocharger and the estimated charge pressure. For example, a fault detection device in Patent Document 1 calculates an estimated value of the charge pressure based on the engine rotation speed and the pump load of the hydraulic pump. The fault detection device then determines a fault in the turbocharger based on the deviation between the estimated value of the charge pressure and the measured value of the charge pressure. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2013-184512 A Summary of the Invention [Problem to be solved by the invention]

[0004] When estimating the charge pressure as described above, the charge pressure can be estimated with high accuracy by calculating the charge pressure from data acquired when the engine is in a stable state. Therefore, it is desirable to calculate the charge pressure from data acquired when a predetermined condition is satisfied. In addition, the accuracy of the charge pressure estimation can be further improved by making the predetermined condition stricter.

[0005] However, in a work machine used at a work site such as a mine, there are few cases where the charge pressure can be calculated in a stable state. Therefore, if an attempt is made to improve the accuracy of the charge pressure estimation by tightening the predetermined conditions, the amount of data that can be used for performance evaluation will decrease. Therefore, it is not easy to improve the accuracy of the performance evaluation. An object of the present disclosure is to accurately calculate the deviation degree of the charge pressure in a work machine. [Means for solving the problem]

[0006] 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 and a turbocharger connected to the engine. The system according to the first aspect includes an actual charge pressure acquisition unit, a target torque acquisition unit, an engine rotation speed acquisition unit, a charge pressure estimation unit, a charge pressure correction unit, and a deviation calculation unit. The actual charge pressure acquisition unit acquires an actual charge pressure of the turbocharger. The target torque acquisition unit acquires a target output torque of the engine. The engine rotation speed acquisition unit acquires an actual rotation speed of the engine. The charge pressure estimation unit calculates an estimated charge pressure of the turbocharger based on the target output torque of the engine and the actual rotation speed of the engine. The charge pressure correction unit acquires a change amount of a predetermined correction parameter that changes the target output torque of the engine as a first torque change amount. The charge pressure correction unit corrects the estimated charge pressure based on the first torque change amount. The deviation calculation unit calculates a deviation amount between the actual charge pressure and the corrected estimated charge pressure.

[0007] 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 turbocharger connected to the engine. The system according to the second aspect includes an actual charge pressure acquisition unit, a target torque acquisition unit, an engine rotation speed acquisition unit, a charge pressure estimation unit, a charge pressure correction unit, and a deviation calculation unit. The actual charge pressure acquisition unit acquires an actual charge pressure of the turbocharger. The target torque acquisition unit acquires a target output torque of the engine. The engine rotation speed acquisition unit acquires an actual rotation speed of the engine. The charge pressure estimation unit calculates an estimated charge pressure of the turbocharger based on the target output torque of the engine and the actual rotation speed of the engine. The charge pressure correction unit acquires a first rotation speed change amount indicating an amount of change in the actual rotation speed of the engine. The charge pressure correction unit corrects the estimated charge pressure based on the first rotation speed change amount. The deviation calculation unit calculates a deviation amount between the actual charge pressure and the corrected estimated charge pressure.

[0008] 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 and a turbocharger connected to the engine. The method according to the third aspect includes acquiring an actual charge pressure of the turbocharger, acquiring a target output torque of the engine, acquiring an actual rotation speed of the engine, calculating an estimated charge pressure of the turbocharger based on the target output torque of the engine and the actual rotation speed of the engine, acquiring a change amount of a predetermined correction parameter that changes the target output torque of the engine as a first torque change amount, correcting the estimated charge pressure based on the first torque change amount, and calculating a deviation degree between the actual charge pressure and the corrected estimated charge pressure.

[0009] 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 turbocharger connected to the engine. The method according to the fourth aspect includes acquiring an actual charge pressure of the turbocharger, acquiring a target output torque of the engine, acquiring an actual rotation speed of the engine, calculating an estimated charge pressure of the turbocharger based on the target output torque of the engine and the actual rotation speed of the engine, acquiring a first rotation speed change amount indicating an amount of change in the actual rotation speed of the engine, correcting the estimated charge pressure based on the first rotation speed change amount, and calculating a deviation between the actual charge pressure and the corrected estimated charge pressure. Effect of the Invention

[0010] According to the present disclosure, in a work machine, the deviation degree of the charge pressure can be calculated with high accuracy. [Brief description of the drawings]

[0011] [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. 11 is a diagram showing an example of charge pressure estimation data. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] 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.

[0013] Fig. 2 is a block diagram showing the configuration of the 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 and a turbocharger 18 are connected to the engine 11. The fuel injection device 15 injects fuel into the engine 11. The turbocharger 18 includes, for example, a turbine. The turbocharger 18 compresses intake air and supplies it to the engine 11.

[0014] A radiator 17 is connected to the engine 11 via a cooling pipe 16. The radiator 17 cools the coolant for the engine 11. The torque converter 13 is connected to the engine 11 via a PTO 12. The torque converter 13 transmits the driving force from the engine 11 to the transmission 14.

[0015] 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.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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.

[0020] 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 actual rotation speed of the engine 11. The output rotation speed sensor 25 detects the output rotation speed of the transmission 14.

[0021] The work machine 1 includes a coolant temperature sensor 26 and a charge pressure sensor 27. The coolant temperature sensor 26 detects the temperature of the coolant for the engine 11. The charge pressure sensor 27 detects the actual charge pressure of the turbocharger 18. The work machine 1 is equipped with an atmospheric pressure sensor 28 and an outside air temperature sensor 29. The atmospheric pressure sensor 28 detects the atmospheric pressure. The outside air temperature sensor 29 detects the outside air temperature.

[0022] 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.

[0023] The controller 30 obtains the actual rotation speed of the engine 11 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 actual charge pressure of the turbocharger 18 from the charge pressure sensor 27. The controller 30 obtains the temperature of the coolant of the engine 11 from the cooling temperature sensor 26. The controller 30 obtains the atmospheric pressure from the atmospheric pressure sensor 28. The controller 30 obtains the outside air temperature from the outside air temperature sensor 29.

[0024] 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.

[0025] 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.

[0026] The controller 30 switches the speed stage of the transmission 14 in response to the vehicle speed or the actual rotation speed of the engine 11. The controller 30 calculates the vehicle speed from the output rotation speed of the transmission 14, for example.

[0027] 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.

[0028] 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.

[0029] 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.

[0030] The controller 30 of the work machine 1 transmits the 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 actual rotation speed of the engine 11, the target output torque of the engine 11, the atmospheric pressure, the outside air temperature, the temperature of the coolant for the engine 11, and the operation time. The target output torque of the engine 11 is calculated based on the rotation speed of the engine 11 and the fuel injection amount. The operation time is, for example, an integrated value of the time during which the engine 11 is driven. The controller 30 counts and records the operation time.

[0031] 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.

[0032] Fig. 4 is a block diagram showing the configuration of server 40. As shown in Fig. 4, server 40 includes a machine data receiving unit 51, an actual charge pressure acquiring unit 52, a target torque acquiring unit 53, an engine rotation speed acquiring unit 54, a charge pressure estimating unit 55, a charge pressure correcting unit 56, a deviation calculating unit 57, a filtering unit 58, a judgment data generating unit 59, and a judgment data output unit 60. The machine data receiving unit 51, the actual charge pressure acquiring unit 52, the target torque acquiring unit 53, the engine rotation speed acquiring unit 54, the charge pressure estimating unit 55, the charge pressure correcting unit 56, the deviation calculating unit 57, the filtering unit 58, the judgment data generating unit 59, and the judgment data output unit 60 are realized by processor 42 of server 40.

[0033] 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.

[0034] In step S102, the actual charge pressure acquisition unit 52 acquires the actual charge pressure of the turbocharger 18. The actual charge pressure acquisition unit 52 acquires the actual charge pressure from the machine data received from the controller 30 of the work machine 1. In step S103, the target torque acquisition unit 53 acquires the target output torque of the engine 11. The target torque acquisition unit 53 acquires the target output torque of the engine 11 from the machine data received from the controller 30 of the work machine 1. In step S104, the engine rotation speed acquisition unit 54 acquires the actual rotation speed of the engine 11. The engine rotation speed acquisition unit 54 acquires the actual rotation speed of the engine 11 from the machine data received from the controller 30 of the work machine 1.

[0035] In step S105, the charge pressure estimation unit 55 calculates an estimated charge pressure. The charge pressure estimation unit 55 calculates an estimated charge pressure from the target output torque of the engine 11 and the actual rotation speed of the engine 11 by referring to the charge pressure estimation data. FIG. 6 is a diagram showing an example of the charge pressure estimation data. The charge pressure estimation data specifies the relationship of the estimated charge pressure with respect to the target output torque of the engine 11 and the actual rotation speed of the engine 11. The charge pressure estimation data is, for example, a map that specifies the relationship of the estimated charge pressure with respect to the target output torque of the engine 11 and the actual rotation speed of the engine 11. However, the charge pressure estimation data is not limited to a map, and may be expressed in other forms such as a mathematical formula or a table. The charge pressure estimation data is obtained in advance by a simulation, a bench test, or the like, and is stored in the storage device 41.

[0036] In step S106, the charge pressure correction unit 56 corrects the estimated charge pressure calculated in step S105. The charge pressure correction unit 56 corrects the estimated charge pressure by the following formula (1). TIFF0007612776000002.tif12152Pcp_corr is the corrected estimated charge pressure. Pcp(Tr,S) is the estimated charge pressure calculated in step S105 from the target output torque Tr of the engine 11 and the actual rotation speed S of the engine 11. Corr1(ΔTr1, ΔTr2, ΔS1, ΔS2) is the first correction term of the estimated charge pressure based on the target output torque of the engine 11 and the actual rotation speed of the engine 11.

[0037] ΔTr1 and ΔTr2 indicate the amount of change in the target output torque Tr of the engine 11. That is, the charge pressure correction unit 56 corrects the estimated charge pressure based on the amount of change in the target output torque Tr of the engine 11. ΔTr1 is a first amount of torque change. ΔTr2 is a second amount of torque change. The first amount of torque change ΔTr1 is the amount of change in the target output torque of the engine 11 during a first time. The second amount of torque change ΔTr2 is the amount of change in the target output torque of the engine 11 during a second time. The second time is longer than the first time. For example, the first time is 1 second, and the second time is 2 seconds. However, the first time and the second time are not limited to these times and may be changed.

[0038] ΔS1 and ΔS2 are amounts of change in the actual rotation speed of engine 11. That is, charge pressure correction unit 56 corrects the estimated charge pressure based on the amount of change in the actual rotation speed of engine 11. ΔS1 is a first amount of change in rotation speed. ΔS2 is a second amount of change in rotation speed. The first amount of change in rotation speed ΔS1 is an amount of change in the actual rotation speed of engine 11 during a first time period. The second amount of change in rotation speed ΔS2 is an amount of change in the actual rotation speed of engine 11 during a second time period.

[0039] In detail, the first correction term Corr1 (ΔTr1, ΔTr2, ΔS1, ΔS2) is expressed by the following formula (2). In formula (2), a1 to a6 are predetermined coefficients. a1 to a6 are obtained in advance by a simulation or a bench test, and are stored in the storage device 41. TIFF0007612776000003.tif13153Corr2(P_atm, Te_atm) is a second correction term for the estimated charge pressure based on the atmospheric pressure and the outside temperature. P_atm is the atmospheric pressure. Te_atm is the outside temperature. That is, the charge pressure correction unit 56 corrects the estimated charge pressure based on the atmospheric pressure and the outside temperature. The second correction term Corr2(P_atm, Te_atm) is expressed by the following equation (3). TIFF0007612776000004.tif31153Pcp_rated is the charge pressure at the rated point. Pcp_rated is obtained in advance by simulation, bench testing, etc., and stored in the storage device 41. P_standard is the standard atmospheric pressure. Te_standard is the standard temperature. P_standard and Te_standard are stored in the storage device 41. b1 and b2 are predetermined coefficients. b1 and b2 are obtained in advance by simulation, bench testing, etc., and stored in the storage device 41. Pcp' is the estimated charge pressure corrected by the first correction term. That is, Pcp' is expressed by the following equation (4). TIFF0007612776000005.tif8153 In step S107, the deviation calculation unit 57 calculates the deviation between the actual charge pressure and the corrected estimated charge pressure. The deviation calculation unit 57 calculates the deviation by the following formula (5). Pcr is the actual charge pressure. The deviation Dev_charge is the ratio of the difference between the actual charge pressure and the corrected estimated charge pressure to the corrected estimated charge pressure. The deviation Dev_charge is expressed as a percentage. TIFF0007612776000006.tif11153 In step S108, the filtering unit 58 filters the deviation degree calculated in step S107. The filtering unit 58 selects the deviation degree acquired if it satisfies predetermined conditions. The predetermined conditions include the following first to eleventh conditions.

[0040] The first condition is that the actual rotation speed of the engine 11 is equal to or greater than a predetermined lower limit. The second condition is that the actual rotation speed of the engine 11 one hour ago is equal to or greater than a predetermined lower limit. The third condition is that the actual rotation speed of the engine 11 two hours ago is equal to or greater than a predetermined lower limit. The fourth condition is that the target output torque of the engine is equal to or greater than a predetermined lower limit. The fifth condition is that the target output torque of the engine one hour ago is equal to or greater than a predetermined lower limit. The sixth condition is that the target output torque of the engine two hours ago is equal to or greater than a predetermined lower limit. The first to sixth conditions are set in order to exclude data acquired when the engine is idling, for example.

[0041] The seventh condition is that the first rotation speed change amount is within a predetermined range. The eighth condition is that the second rotation speed change amount is within a predetermined range. The ninth condition is that the first torque change amount is within a predetermined range. The tenth condition is that the second torque change amount is within a predetermined range. The seventh to tenth conditions are set in order to exclude data with a large amount of change that exceeds a range in which accurate correction is possible. The eleventh condition is that the temperature of the engine coolant is within a predetermined range. The eleventh condition is set in order to exclude data in a state in which the engine is not sufficiently warmed up.

[0042] The filtering unit 58 judges whether the first to eleventh conditions are satisfied based on the above-mentioned machine data. The filtering unit 58 selects deviation degrees that satisfy all of the first to eleventh conditions. The filtering unit 58 excludes deviation degrees that do not satisfy at least one of the first to eleventh conditions.

[0043] In step S109, the judgment data generating unit 59 generates judgment data. The judgment data generating unit 59 generates judgment data for evaluating performance by recording the deviations selected in step S108 in chronological order. For example, the judgment data generating unit 59 calculates an average value of the deviations for each predetermined operating time, and generates time-series data of the average deviations as judgment data.

[0044] In step S110, the judgment data output unit 60 outputs the judgment data. For example, the judgment data output unit 60 transmits the judgment data to a computer of a user of the work machine 1. Alternatively, the judgment data output unit 60 may cause the judgment data to be displayed on a display by an application for managing the work machine 1.

[0045] The server 40 may evaluate the performance of the turbocharger 18 based on the judgment data. The judgment data output unit 60 may transmit the evaluation result of the performance of the turbocharger 18 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 turbocharger 18 when the deviation degree in the judgment data suddenly drops or rises. The server 40 may determine that a performance degradation due to aging has occurred in the turbocharger 18 when the deviation degree in the judgment data is equal to or lower than a predetermined threshold value.

[0046] In the system for evaluating the performance of the work machine 1 according to the present embodiment described above, the estimated charge pressure is corrected based on the amount of change in the target output torque of the engine 11 and the amount of change in the actual rotation speed of the engine 11. Therefore, the estimated charge pressure is corrected taking into consideration fluctuations in the load on the work machine 1 or changes in the operating state of the engine 11 in response to operation of the accelerator operating device 21. This makes it possible to accurately calculate the deviation in the work machine 1.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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 executed in a distributed manner between the controller 30 of the work machine 1 and the server 40. The evaluation of the performance of the turbocharger 18 may be executed by the controller 30 of the work machine 1. The controller 30 may cause the evaluation of the performance of the turbocharger 18 to be displayed on a display of the work machine 1.

[0051] The process for generating the judgment data is not limited to that in the above embodiment and may be modified. For example, the correction parameter for correcting the estimated charge pressure is not limited to the target output torque of the engine 11. The 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 first torque change amount and the second torque change amount may be the change amount of these correction parameters.

[0052] The estimated charge pressure may be corrected only by the target output torque of the engine 11, regardless of the actual rotation speed of the engine 11. The estimated charge pressure may be corrected only by the actual rotation speed of the engine 11, regardless of the target output torque of the engine 11. Correction of the estimated charge pressure based on the atmospheric pressure may be omitted. Correction of the estimated charge pressure based on the outside air temperature may be omitted.

[0053] The deviation degree is not limited to that in the above embodiment and may be changed. For example, the deviation degree may be a ratio between the actual charge pressure and the corrected estimated charge pressure. Alternatively, the deviation degree may be a deviation between the actual charge pressure and the corrected estimated charge pressure. The predetermined conditions for filtering the deviation degree are not limited to those in the above embodiment and may be changed. Some of the first to eleventh conditions described above may be omitted or changed. For example, the predetermined conditions may include a condition for filtering by the fuel injection amount, the instantaneous fuel consumption amount, the operation amount of the accelerator operation device 21, or the throttle opening. The machine data is not limited to those in the above embodiment and may be changed. [Industrial Applicability]

[0054] According to the present disclosure, in a work machine, the deviation degree of the charge pressure can be calculated with high accuracy. [Explanation of symbols]

[0055] 1: Work machine 11: Engine 18: Turbocharger 52: Actual charge pressure acquisition unit 53: Target torque acquisition unit 54: Engine speed acquisition unit 55: Charge pressure estimation unit 56: Charge pressure compensation unit 57: Deviation calculation section 58: Filtering section 59: Judgment data generation unit

Claims

1. 1. A system for evaluating performance of a work machine including an engine and a turbocharger connected to the engine, comprising: an actual charge pressure acquisition unit that acquires an actual charge pressure of the turbocharger; a target torque acquisition unit that acquires a target output torque of the engine; an engine rotation speed acquisition unit that acquires an actual rotation speed of the engine; a charge pressure estimation unit that calculates an estimated charge pressure of the turbocharger based on a target output torque of the engine and an actual rotation speed of the engine; a charge pressure correction unit that obtains a change amount of a predetermined correction parameter that changes a target output torque of the engine as a first torque change amount and corrects the estimated charge pressure based on the first torque change amount; a deviation calculation unit that calculates a deviation between the actual charge pressure and the corrected estimated charge pressure; A system comprising:

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

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

4. the charge pressure correction unit obtains a second torque change amount indicating a change amount of the target output torque during a second time period longer than the first time period, and corrects the estimated charge pressure based on the first torque change amount and the second torque change amount. The system of claim 3.

5. The charge pressure correction unit obtains a first rotation speed change amount indicating a change amount of an actual rotation speed of the engine, and corrects the estimated charge pressure based on the first rotation speed change amount. The system of claim 1 .

6. The first rotation speed change amount is a change amount of an actual rotation speed of the engine during a first time period. The system of claim 5.

7. the charge pressure correction unit obtains a second rotation speed change amount indicating a change amount of an actual rotation speed of the engine during a second time period longer than the first time period, and corrects the estimated charge pressure based on the first rotation speed change amount and the second rotation speed change amount. The system of claim 6.

8. The charge pressure correction unit acquires an atmospheric pressure and corrects the estimated charge pressure based on the atmospheric pressure. The system of claim 1 .

9. The charge pressure correction unit acquires an outside air temperature and corrects the estimated charge pressure based on the outside air temperature. The system of claim 1 .

10. Further, a filtering unit is provided to filter the deviation degree acquired 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 .

11. The method further includes a judgment data generating unit that generates data for evaluating the performance by recording the deviation in chronological order. The system of claim 1 .

12. 1. A system for evaluating performance of a work machine including an engine and a turbocharger connected to the engine, comprising: an actual charge pressure acquisition unit that acquires an actual charge pressure of the turbocharger; a target torque acquisition unit that acquires a target output torque of the engine; an engine rotation speed acquisition unit that acquires an actual rotation speed of the engine; a charge pressure estimation unit that calculates an estimated charge pressure of the turbocharger based on a target output torque of the engine and an actual rotation speed of the engine; a charge pressure correction unit that obtains a first rotation speed change amount indicating a change amount of an actual rotation speed of the engine, and corrects the estimated charge pressure based on the first rotation speed change amount; a deviation calculation unit that calculates a deviation between the actual charge pressure and the corrected estimated charge pressure; A system comprising:

13. The first rotation speed change amount is a change amount of an actual rotation speed of the engine during a first time period. The system of claim 12.

14. the charge pressure correction unit obtains a second rotation speed change amount indicating a change amount of an actual rotation speed of the engine during a second time period longer than the first time period, and corrects the estimated charge pressure based on the first rotation speed change amount and the second rotation speed change amount. The system of claim 13.

15. Further, a filtering unit is provided to filter the deviation degree acquired when a predetermined condition is satisfied, The predetermined condition includes the first rotation speed change amount being within a predetermined range. The system of claim 12.

16. The charge pressure correction unit acquires an atmospheric pressure and corrects the estimated charge pressure based on the atmospheric pressure. The system of claim 12.

17. The charge pressure correction unit acquires an outside air temperature and corrects the estimated charge pressure based on the outside air temperature. The system of claim 12.

18. The method further includes a judgment data generating unit that generates data for evaluating the performance by recording the deviation in chronological order. The system of claim 12.

19. 1. A method for evaluating performance of a work machine including an engine and a turbocharger connected to the engine, comprising: Obtaining an actual charge pressure of the turbocharger; Obtaining a target output torque of the engine; Obtaining an actual rotational speed of the engine; calculating an estimated charge pressure of the turbocharger based on a target output torque of the engine and an actual rotation speed of the engine; acquiring a change amount of a predetermined correction parameter that changes a target output torque of the engine as a first torque change amount, and correcting the estimated charge pressure based on the first torque change amount; Calculating a deviation between the actual charge pressure and the corrected estimated charge pressure; A method for providing the above.

20. 1. A method for evaluating performance of a work machine including an engine and a turbocharger connected to the engine, comprising: Obtaining an actual charge pressure of the turbocharger; Obtaining a target output torque of the engine; Obtaining an actual rotational speed of the engine; calculating an estimated charge pressure of the turbocharger based on a target output torque of the engine and an actual rotation speed of the engine; acquiring a first rotation speed change amount indicating a change amount of an actual rotation speed of the engine, and correcting the estimated charge pressure based on the first rotation speed change amount; Calculating a deviation between the actual charge pressure and the corrected estimated charge pressure; A method for providing the above.

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