JP2012162860A - Working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a working machine which contributes to enabling an administrator to determine the time to exchange a battery.SOLUTION: A working machine includes an actuator 3 driven by either driving force of an engine 7 or electric energy stored in a battery 15, or by both of the two. The working machine also has: a level of degradation change calculation section 222 which calculates a change in a future level of degradation of the battery based on a current level of the degradation of the battery; a fuel efficiency improvement rate calculation section 223 which calculates the change in a future fuel efficiency improvement rate by the battery based on the change in the level of degradation; a running cost calculation section 224 which calculates the change in a cumulative running cost for respective cases of exchanging the battery with many different types of exchange cycles based on the change in the fuel efficiency improvement rate; and a monitor 23 which displays the changes in the cumulative running cost calculated for the respective exchange cycles of the battery.

Description

  The present invention relates to a work machine including an actuator driven by one or both of a driving force of a prime mover and electrical energy stored in a power storage device.

  2. Description of the Related Art In recent years, inventions relating to work machines that drive an electric actuator or a hydraulic actuator in cooperation with a power storage device such as a storage battery (battery) or a capacitor have been made. An object of these inventions is to reduce the running cost by minimizing the consumption of fuel originally consumed by the engine.

  By the way, in this kind of invention, in order to suppress fuel consumption (that is, to improve fuel efficiency), it is essential that a power storage device such as a storage battery or a capacitor exhibits a predetermined performance. However, the storage battery deteriorates in the storage performance depending on the years of use and usage conditions. Therefore, an administrator who manages this type of work machine periodically checks the performance deterioration state of the storage battery built into the work machine, and if the degree of deterioration is large and the performance cannot be sufficiently exhibited, the storage battery is removed. It needs to be replaced.

  In response to this type of problem, Japanese Patent Application Laid-Open No. 2007-155586 and Japanese Patent Application Laid-Open No. 2008-256673 disclose means for diagnosing the degree of deterioration of a storage battery, and the manager of a work machine or vehicle The replacement time of the storage battery is to be determined based on the diagnosis result.

JP 2007-155586 A JP 2008-256673 A

  However, at present, a storage battery used for such an application is generally expensive, and it is difficult for an administrator to determine when it is economically advantageous to replace the storage battery. For example, if the storage battery is frequently replaced even though the degree of deterioration is small, the cost of replacing the storage battery becomes higher than the fuel efficiency improvement. On the other hand, if the vehicle is continuously used while the degree of deterioration is large, the predetermined fuel consumption performance cannot be exhibited and the original fuel consumption performance cannot be exhibited. Furthermore, depending on the case, the deteriorated storage battery may adversely affect other devices and controls, and may cause further deterioration of fuel consumption performance.

  The objective of this invention is providing the working machine which contributes to judgment of the storage battery replacement time by an administrator.

  (1) In order to achieve the above object, the present invention provides a working machine including an actuator driven by one or both of a driving force of a prime mover and electric energy stored in a storage battery. A deterioration degree change calculating means for calculating a change in the degree of deterioration in the future based on the degree; a fuel consumption improvement rate change calculating means for calculating a change in the fuel efficiency improvement rate due to the storage battery in the future based on the change in the degree of deterioration; For each case where the storage battery is replaced in a plurality of types of cycles, a running cost calculation means for calculating a change in cumulative running cost in a predetermined future period based on a change in the fuel efficiency improvement rate, and for each replacement cycle of the storage battery A display device that displays the calculated change in cumulative running cost for each replacement cycle. And things.

  (2) In the above (1), preferably, the running cost calculation means further calculates a change in cumulative running cost in the predetermined period for a standard work machine not provided with a storage battery, and further, the standard work machine The difference between the accumulated running cost of the battery and the accumulated running cost calculated for each replacement cycle of the storage battery is calculated, and the display device displays the difference of the calculated running cost for each replacement cycle.

  (3) In the above (1) or (2), preferably, the running cost calculation means further calculates a cumulative running cost for the predetermined period when the storage battery is not replaced based on a change in the fuel consumption improvement rate. The display device further displays the accumulated running cost when the storage battery is not replaced.

  (4) In the above (3), preferably, the running cost calculation means further includes a time during which the cumulative running cost for each replacement cycle of the storage battery is lower than the cumulative running cost when the storage battery is not replaced in the predetermined period. It is calculated and the display device displays a time when the cumulative running cost is lower.

  (5) In any one of the above (1) to (4), it is preferable to further include a communication device that transmits a calculation result of the running cost calculation means to an external terminal.

  According to the present invention, since the running costs when the storage batteries are replaced in a plurality of types of cycles can be compared, it is possible to easily determine the storage battery replacement time.

1 is an external view of a hybrid excavator according to an embodiment of the present invention. 1 is a schematic diagram of a drive control system for a hybrid excavator according to an embodiment of the present invention. The lineblock diagram of battery controller 22 concerning a 1st embodiment of the present invention. The figure which showed the calculation result of the accumulated running cost by the running cost calculating part 224 which concerns on embodiment of this invention for every battery exchange cycle. The figure which displayed the change of the difference of the cumulative running cost calculated for every replacement cycle of the battery 15 based on the calculation result shown in FIG. 4, and the cumulative running cost of a standard type hydraulic excavator with a line graph. The figure which shows an example of the display screen of the monitor 23 which concerns on the 1st Embodiment of this invention. The block diagram of battery controller 22A and the communication apparatus which concern on the 2nd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is an external view of a hybrid excavator according to an embodiment of the present invention. The hydraulic excavator shown in this figure includes an articulated work device 1A having a boom 1a, an arm 1b, and a bucket 1c, and a vehicle body 1B having an upper swing body 1d and a lower traveling body 1e. The boom 1a is rotatably supported by the upper swing body 1d and is driven by a hydraulic cylinder (boom cylinder) 3a.

  The arm 1b is rotatably supported by the boom 1a and is driven by a hydraulic cylinder (arm cylinder) 3b. The bucket 1c is rotatably supported by the arm 1b and is driven by a hydraulic cylinder (bucket cylinder) 3c. The upper turning body 1d is driven to turn by a turning motor (electric motor) 16 (see FIG. 2), and the lower traveling body 1e is driven by left and right traveling motors (hydraulic motors) 3e and 3f (see FIG. 2). Driving of the hydraulic cylinder 3a, the hydraulic cylinder 3b, the hydraulic cylinder 3c, and the swing motor 16 is controlled by operating devices 4A and 4B (see FIG. 2) that are installed in the cab of the upper swing body 1d and output a hydraulic signal. Is done.

  FIG. 2 is a schematic diagram of a drive control system for a hydraulic excavator according to the embodiment of the present invention. In addition, the same code | symbol is attached | subjected to the same part as the previous figure, and description is abbreviate | omitted (the following figure is also the same). The drive control system shown in this figure includes operating devices 4A and 4B, control valves (spool type directional switching valves) 5A, 5B and 5C, pressure sensors 17 and 18 for converting hydraulic signals into electric signals, an inverter 13, , A chopper 14, a battery 15, and an inverter 12, and a vehicle body controller (MCU) 11, a battery controller (BCU) 22, and an engine controller (ECU) 21 as control devices.

  The operating devices 4A and 4B are used for controlling the hydraulic cylinder 3a, the hydraulic cylinder 3b, the hydraulic cylinder 3c, and the swing motor 16 by reducing the hydraulic oil supplied from the pilot pump 51 connected to the engine 7 to a secondary pressure. Generates a hydraulic signal (pilot pressure).

  The operating device 4A is connected via a pilot pipe to a pressure receiving portion of a control valve 5A that controls the driving of the hydraulic cylinder 3a and a pressure receiving portion of a control valve 5B that controls the driving of the hydraulic cylinder 3b. A hydraulic signal is output to the pressure receiving portion of each control valve 5A, 5B according to the direction. The positions of the control valves 5A and 5B are switched according to the hydraulic signal input from the operating device 4A, and the hydraulic cylinders 3a and 5B are controlled by controlling the flow of the pressure oil discharged from the hydraulic pump 6 according to the switching position. The driving of 3b is controlled.

  The operating device 4B is connected to a pressure receiving portion of a control valve 5C that controls driving of the hydraulic cylinder 3c via a pilot pipe, and outputs a hydraulic pressure signal to the pressure receiving portion of the control valve 5C according to the tilting direction of the operating lever. . The position of the control valve 5C is switched according to the hydraulic signal input from the operating device 4B, and the hydraulic cylinder 3c is driven by controlling the flow of pressure oil discharged from the hydraulic pump 6 according to the switching position. Control.

  Further, the operating device 4B is connected to the pilot pipe 19 and the pilot pipe 20. The pilot pipe 19 passes a hydraulic signal (pressure oil) that drives the turning motor 16 so that the upper turning body 1d turns left, and the pilot pipe 20 turns so that the upper turning body 1d turns right. A hydraulic signal (pressure oil) for driving the motor 16 passes therethrough. A pressure sensor 17 is attached to the pilot pipe 19, and a pressure sensor 18 is attached to the pilot pipe 20. The pressure sensors 17 and 18 function as signal conversion means for detecting the pressure of the hydraulic signal output from the operating device 4B and converting it into an electrical signal corresponding to the pressure. The converted electrical signal is sent to the vehicle body controller 11. It is configured to allow output. The electrical signals output from the pressure sensors 17 and 18 to the vehicle body controller 11 are used as operation signals for controlling the driving of the turning motor 16 (electric actuator) via the inverter 13.

  The pressure receiving portions of the control valves 5E and 5F are connected to a travel operation device (not shown) installed in the cab via a pilot pipe. The control valves 5E and 5F are switched in position in accordance with a hydraulic signal input from the travel operation device, and the travel motor 3e is controlled by controlling the flow of pressure oil discharged from the hydraulic pump 6 in accordance with the switching position. , 3f are controlled.

  The vehicle body controller (MCU) 11 has a role of controlling the driving of the turning motor 16 via the inverter 13 based on the electric signal input from the pressure sensors 17 and 18. Specifically, when an electrical signal is input from the pressure sensor 17, the upper swing body 1 d is turned left at a speed corresponding to the electrical signal, and when an electrical signal is input from the pressure sensor 18, it corresponds to the electrical signal. The upper swing body 1d is turned right at a speed. The vehicle body controller 11 also performs power regeneration control for recovering electrical energy from the turning motor 16 during the turning braking of the upper turning body 1d. The battery 15 is also charged with regenerative electric power generated during the power regenerative control or surplus electric power generated by the power converter (generator motor) 10 (for example, when the load of the hydraulic pump 6 is light). Do.

  The vehicle body controller 11 calculates the actual value of the fuel consumption amount in the work machine by accumulating the fuel injection amount data of the engine 7 input from the engine controller 21. Thereby, the vehicle body controller 11 can calculate the fuel consumption amount in a predetermined period (for example, one day, one month, or one year). The vehicle body controller 11 in the present embodiment further calculates the average daily fuel consumption calculated by dividing the cumulative fuel consumption by the number of working machine days, and outputs the calculation result to the BCU 22. Yes.

  The engine controller (ECU) 21 controls the engine 7 at the target rotational speed according to a command from an engine rotational speed command device (for example, an engine control dial (not shown)) to which the target rotational speed of the engine 7 is input by an operator. This is the part that controls the fuel injection amount and the engine speed so as to rotate. The engine controller 21 is connected to the vehicle body controller 11 and outputs fuel injection amount data of the engine 7 to the vehicle body controller 11.

  A power converter (generator motor) 10 is connected to an output shaft of the engine (prime mover) 7, and a hydraulic pump 6 and a pilot pump 51 are connected to the output shaft of the power converter 10.

  The power converter 10 drives the hydraulic actuators 3 a, 3 b, 3 c, 3 e, 3 f by either or both of the driving force of the engine 7 and the electric energy stored in the battery 15. The power converter 10 is connected to the inverter 13 and the chopper 14 via the inverter 12, functions as a generator that converts the power of the engine 7 into electric energy and outputs the electric energy to the inverters 12, 13, and a battery 15. It functions as an electric motor that assists the hydraulic pump 6 by using a part of the electric energy stored in the motor.

  The hydraulic pump 6 is a main pump that supplies pressure oil to the hydraulic actuators 3a, 3b, 3c, 3e, and 3f. The pilot pump 51 includes control valves 5A and 5B via the operation devices 4A and 4B and the travel operation device. , 5C, 5D, 5E and 5F are supplied with pressure oil output as pilot pressure. A relief valve 8 is installed in the hydraulic line connected to the hydraulic pump 6, and the relief valve 8 allows pressure oil to escape to the tank 9 when the pressure in the line rises excessively.

  The inverter 12 controls the rotational speed and torque of the power converter 10, and supplies electric power to the power converter 10 by electric energy from the battery 15 to assist the hydraulic pump 6. The inverter 13 controls the rotational speed of the swing motor 16, and supplies the power output from the power converter 10 or the electric energy of the battery 15 to the swing motor 16.

  The battery 15 is a part that adjusts the voltage via the chopper 14 to supply electric power to the inverters 12 and 13 and stores the electric energy generated by the power converter 10 and the electric energy from the turning motor 16. In the present embodiment, an internal resistance value is output from the battery 15 to the battery controller 22, and the battery controller 22 calculates the degree of deterioration of the battery 15 based on the internal resistance value.

  The battery controller (BCU) 22 calculates the degree of deterioration of the battery 15 from a measured value such as the internal resistance of the battery 15, and based on the fuel consumption data and battery cost of the work machine calculated by the vehicle body controller 11. It has a function of calculating the running cost of the work machine and displaying the result on the monitor (display device) 23 as appropriate.

  FIG. 3 is a configuration diagram of the battery controller 22 according to the first embodiment of the present invention. The battery controller 22 shown in this figure includes a deterioration degree diagnosis unit (deterioration degree diagnosis unit) 221, a deterioration degree change calculation unit (deterioration degree change calculation unit) 222, and a fuel consumption improvement rate change calculation unit (fuel consumption improvement rate change calculation unit). ) 223, a running cost calculation unit (running cost calculation unit) 224, a display data generation unit (display data generation unit) 225, and a display data output unit (display data output unit) 226.

  The deterioration degree diagnosis unit 221 is a part that calculates the current deterioration degree (%) of the battery 15, and outputs the calculated deterioration degree to the deterioration degree change calculation unit 222. In the present embodiment, it is assumed that the degree of deterioration increases from 0 to 100% with the deterioration of the battery, and the life of the battery is exhausted when the degree of deterioration reaches 100%. Further, the deterioration degree diagnosis unit 221 in the present embodiment calculates the deterioration degree based on the internal resistance value of the battery 15. When calculating the degree of deterioration of the battery, a known method (for example, see Japanese Patent Application Laid-Open No. 2008-256673 (Patent Document 2)) may be used, and detailed description thereof is omitted here.

  The deterioration degree change calculation unit 222 is a part that calculates a change in the future deterioration degree (deterioration degree change) based on the current deterioration degree input from the deterioration degree diagnosis unit 221, and improves the fuel consumption by the calculated deterioration degree change. This is output to the rate change calculation unit 223.

  Deterioration degree change calculation section 222 in the present embodiment estimates the battery life years based on the deterioration degree calculated by deterioration degree diagnosis section 221 and estimates the increase in deterioration degree every year based on the life years. By doing so, the deterioration degree change is calculated. For example, when it is estimated that the battery life is 4 years from the initial state without deterioration, the deterioration degree of the battery can be calculated to increase by 25% every year, and the calculation result is deteriorated. The degree will change. When calculating the deterioration degree change, from the viewpoint of improving the accuracy of the calculation result, the usage record of the user of the work machine (for example, the deterioration value for each user and the actual value of the deterioration degree change, or a predetermined period (for example, The average operating time etc. of the work machine on the 1st) may be stored, and a correction may be made as appropriate based on the usage record.

  The fuel efficiency improvement rate change calculation unit 223 is a part that calculates a change in the fuel efficiency improvement rate (%) by the battery 15 in the future based on the deterioration level change input from the deterioration level change calculation unit 222. The calculated fuel efficiency improvement rate The change is output to the running cost calculation unit 224. Here, the fuel consumption improvement rate indicates a fuel consumption improvement rate with respect to a work machine (hereinafter, also referred to as a standard work machine) that does not include a battery (storage battery) for electric drive. The change calculation unit 223 calculates a mode of change in the fuel efficiency improvement rate during a predetermined period (for example, until the battery life is exhausted).

  In the fuel efficiency improvement rate change calculation unit 223 in the present embodiment, from the viewpoint of simple calculation, an initial state in which there is no deterioration based on the battery life years estimated by the deterioration level change calculation unit 222 (that is, the deterioration level is 0%). The change in the fuel efficiency improvement rate is calculated by dividing the fuel efficiency improvement rate at the time of the fuel consumption (that is, assuming that the fuel efficiency improvement rate reaches 0% when the service life is exhausted) Minutes). For example, when the fuel efficiency improvement rate in the initial state is 20% and the battery life is 4 years, the fuel efficiency improvement rate changes by 5% every year and reaches 0% after 4 years. become. In the case of calculating the fuel efficiency improvement rate change as in the present embodiment, it is assumed that the fuel efficiency improvement rate in the initial state is stored in a storage device (ROM or the like) of the battery controller 22. Further, the fuel efficiency improvement rate in the initial state may be used by storing an average initial setting value determined for each battery in the storage device, or in view of the actual value of the fuel efficiency improvement rate for each user of the work machine. Thus, the initial setting value may be individually corrected and calculated.

  Further, in the present embodiment, from the viewpoint of considering the actual value of fuel consumption for each user, the fuel efficiency improvement rate change is corrected based on the change of the actual value of fuel consumption output from the vehicle body controller 11. Yes. By correcting the fuel efficiency improvement rate change in this way, it is possible to calculate the fuel efficiency improvement rate in accordance with the usage form of the work machine for each user, so that it is possible to improve the accuracy of the subsequent running cost calculation (described later). .

  The running cost calculation unit 224 is a part that calculates the change in the accumulated running cost in a predetermined future period based on the change in the fuel consumption improvement rate calculated by the fuel consumption improvement rate change calculation unit 223. More specifically, the running cost calculation unit 224 For each case where the battery 15 is replaced in this cycle, the change in the accumulated running cost for a predetermined period is calculated. For example, in the present embodiment, as will be described later, regarding a period until eight years have passed since the initial state, the battery is periodically replaced every year, every two years, every three years, The change in the accumulated running cost is calculated for each case where no change is made. Changes in the accumulated running cost calculated for each replacement cycle of the battery 15 in the running cost calculation unit 224 are output to the display data generation unit.

  It is assumed that the change in the accumulated running cost calculated by the running cost calculation unit 224 includes at least the accumulated fuel cost and the accumulated battery cost (battery purchase cost) in a predetermined period. Here, the change in the fuel cost in the predetermined period can be obtained by using the change in the fuel consumption improvement rate calculated by the fuel consumption improvement rate change calculating unit 223 and the fuel consumption amount in the predetermined period or the current fuel consumption amount in the standard work machine. Can be calculated. Further, the battery cost associated with the battery replacement may be a value stored in the storage device as the set value, and the set value may be added to the running cost as the battery cost when the battery 15 is replaced.

  The display data generation unit 225 is a part that generates data (monitor data) for displaying the change in the accumulated running cost calculated by the running cost calculation unit 224 on the monitor (display device) 23, and displays the generated data. The data is output to the data output unit 226. The display data generation unit 225 in the present embodiment generates monitor data for displaying the calculation result of each running cost calculated by the running cost calculation unit 224 for each replacement cycle of the battery 15 in a table format or a graph format. Yes.

  The display data output unit 226 is a part that outputs the monitor data generated by the display data generation unit 225 to the monitor 23, and is connected to the monitor 23.

  Here, in the work machine configured as described above, a simulation example is shown in which the following assumptions are made about the performance deterioration and fuel consumption performance of the battery 15 and the time when the battery 15 should be replaced is examined.

First, assuming that the following conditions a), b), and c) are satisfied for a standard hydraulic excavator, the fuel cost for one year when using the standard hydraulic excavator is 4.8 million yen (= 240 (days) × 200 (L / day) × 100 (yen)).
a) Hydraulic excavator operating days for one year: 240 days b) Daily fuel (light oil) consumption: 200 L / day c) Unit price of fuel (light oil): 100 yen / L
Under this condition, the deterioration degree diagnosis unit 221 in the battery controller 22 according to the present embodiment calculates that the current deterioration degree of the battery 15 is 0% (that is, the initial state), and the deterioration degree change calculation unit 222. However, based on the degree of deterioration, it is assumed that the battery has a service life of 4 years and that the degree of deterioration changes so as to increase by 25% every year. Here, assuming that the fuel efficiency improvement rate (initial fuel efficiency improvement rate) when the degree of deterioration is 0% is stored in the storage device of the battery controller 22, the fuel efficiency improvement rate change calculation unit 223 has the initial value. Dividing the fuel efficiency improvement rate by 4 years, which is the life of the battery 15, calculates that the fuel efficiency improvement rate changes so as to decrease by 5% every year.

  FIG. 4 is a diagram showing a calculation result of the accumulated running cost by the running cost calculation unit 224 according to the embodiment of the present invention for each battery replacement cycle. As shown in this figure, the running cost calculation unit 224 performs cumulative running when the battery 15 is replaced every year, every two years, or every three years, based on the fuel efficiency improvement rate change calculated as described above. The change in cost (cumulative fuel cost + cumulative battery cost) is calculated. Then, the display data generation unit 225 and the display data output unit 226 display the calculation results of the running cost calculation unit 224 on the monitor 23 in the table format shown in FIG. 4 (the first level in each cell in the table of FIG. 4). Is the cumulative running cost). Here, the battery cost is 1 million yen per replacement, and the change in the accumulated running cost for 8 years from the initial state is calculated. In addition, the difference between the purchase cost (initial cost) of the hybrid excavator and the standard excavator is not considered here.

  In this way, when the change in the accumulated running cost is calculated for each replacement cycle of the battery 15 and the calculation result is displayed on the monitor 23 for each replacement cycle, the running cost when the battery is replaced in a plurality of types of cycles is compared and examined. Therefore, it is possible to easily determine in what replacement cycle the battery 15 can be replaced to reduce the running cost while taking into account the business plan. Therefore, according to the present embodiment, the replacement time (exchange cycle) of battery 15 can be easily determined.

  By the way, the running cost calculation unit 224 of the present embodiment is also stored in the storage device for a standard hydraulic excavator (standard machine (abbreviated as a standard machine in FIG. 4)) that does not include the battery 15 for electric drive. Based on the one-year fuel cost of the standard excavator, the change in cumulative running cost (cumulative fuel cost) in a predetermined period in the future is calculated. The display data generation unit 225 and the display data output unit 226 The calculated cumulative running cost is also displayed on the monitor 23. When the accumulated running cost for the standard hydraulic excavator is displayed in this manner, it can be easily determined whether the running cost can be suppressed as compared with the standard hydraulic excavator by replacing the battery 15 according to which replacement cycle.

  Further, in the present embodiment, the difference between the calculated cumulative running cost of the standard hydraulic excavator and the cumulative running cost of the hybrid excavator calculated for each replacement cycle of the battery 15 is calculated, and the display data generating unit The display data output unit 226 and the display data output unit 226 also display the difference in the running cost calculated by the running cost calculation unit 224 on the monitor 23 as shown by the numerical value in the second bracket in each cell in FIG. is doing. That is, if the numerical value in the parenthesis is negative, the running cost is not higher than the comparison target. Conversely, if the numerical value in the parenthesis is positive, the running cost is higher than the comparative target. When the difference in running cost from the standard hydraulic excavator is displayed in this way, it can be more easily determined whether the running cost can be suppressed as compared with the standard hydraulic excavator by replacing the battery 15 according to which replacement cycle. it can.

  In the example shown in FIG. 4, if the battery 15 is replaced every year, the battery cost becomes higher than the fuel efficiency improvement, and the battery cost is lost due to the fuel cost obtained from the first year. To do. On the other hand, when the battery 15 is replaced every two or three years, the fuel consumption improvement is consumed a little immediately after the battery replacement, but the fuel consumption after that covers the battery cost, and a standard hydraulic excavator was used. You will get better year after year. However, it can be seen that it is better not to replace the battery 15 until the fourth year. Based on this data, the manager can determine the optimum replacement time of the battery 15 on the assumption of how many years the work machine will be released. For example, if the work machine is released after 5 years, it can be determined that it is advantageous to replace the battery after 3 years. In other words, when the cumulative running cost is shown in this way, it is possible to display in an easy-to-understand manner the time when the increase in cost due to battery replacement exceeds the decrease in fuel cost due to the improvement in fuel efficiency associated with battery replacement.

  Note that the running cost calculation unit 224 in the present embodiment calculates a time when the cumulative running cost is lower than the comparison target (standard hydraulic excavator), and the display data generation unit 225 and the display data output unit 226 Based on the calculation result, the numerical value at the time when the running cost is lower than the comparison target is underlined and displayed on the monitor 23 so as to stand out from the other numerical values. When the time when the running cost is lower than the comparison target is highlighted as described above, the person who decides the battery replacement cycle can more easily recognize the time when the running cost is lower than the comparison target. In this embodiment, the numerical value is underlined and highlighted. However, the same effect can be obtained by displaying a figure or changing the size, color, or thickness of a character. Needless to say, what you get is good.

  Further, the running cost calculation unit 224 of the present embodiment also calculates the accumulated running cost in a predetermined future period based on the fuel efficiency improvement rate change calculated by the fuel efficiency improvement rate change calculation unit 223 even when the battery 15 is not replaced. The display data generation unit 225 and the display data output unit 226 also display the calculated accumulated running cost on the monitor 23. Thus, when the accumulated running cost when the battery 15 is not replaced is displayed, it can be easily determined whether the running cost can be suppressed when the battery 15 is replaced according to which replacement cycle the battery 15 is not replaced. it can.

  Further, in the present embodiment, the difference between the accumulated running cost when the calculated battery 15 is not replaced and the accumulated running cost of the hybrid excavator calculated for each replacement cycle of the battery 15 is calculated. The generation unit 225 and the display data output unit 226 also monitor the difference between the running costs calculated by the running cost calculation unit 224 as shown in the numerical values in the third bracket in each cell in FIG. Is displayed. When the difference in running cost is displayed in this way, it can be determined more easily whether the running cost can be suppressed when the battery 15 is replaced according to which replacement cycle than when the battery 15 is not replaced.

  In the present embodiment, as in the previous case, the time when the running cost is lower than the comparison target is underlined. As a result, a person who decides the battery replacement cycle can more easily recognize the time when the running cost is lower than the comparison target.

  FIG. 5 is a line graph showing the change in the difference between the cumulative running cost calculated for each replacement cycle of the battery 15 for the hybrid excavator and the cumulative running cost of the standard hydraulic excavator based on the calculation result shown in FIG. It is the figure displayed on the monitor. When the accumulated running cost is displayed in this way, it is possible to easily recognize the time when the accumulated running cost is lower than that of the standard excavator as compared with the case where only the numerical value is shown as shown in FIG. Further, FIG. 5 also shows changes in the accumulated running cost when the battery 15 is not replaced, so that the cost can be easily compared with this case.

  FIG. 6 is a diagram showing an example of the display screen of the monitor 23 according to the first embodiment of the present invention. The display screen shown in this figure includes an average fuel consumption improvement rate display unit 61, a battery deterioration degree display unit 62, an average fuel cost display unit 63, a date and time display unit 64, and an accumulated running cost display unit 65.

  The average fuel consumption improvement rate display unit 61 is a portion where the current average fuel consumption improvement rate calculated by the fuel consumption improvement rate change calculation unit 223 is displayed. The battery deterioration level display unit 62 is a part where the current deterioration level of the battery 15 calculated by the deterioration level diagnosis unit 221 is displayed. The average fuel cost display unit 63 is a part where the current average fuel cost calculated by the running cost calculation unit 224 is displayed. The date and time display unit 64 is a part where the current date and time are displayed. The accumulated running cost display unit 65 is a portion where a change in accumulated running cost calculated for each of a plurality of types of battery replacement cycles calculated by the battery controller 22 is displayed. If the display screen of the monitor 23 is configured in this way, the operator can refer to a plurality of pieces of information at the same time.

  FIG. 7 is a configuration diagram of the battery controller 22A and the communication device according to the second embodiment of the present invention. The battery controller 22A shown in this figure is different from the previous battery controller 22 in that it includes a running cost calculation unit 224A. The running cost calculation unit 224A is connected to the communication device 71, and outputs the calculated change in the accumulated running cost in a predetermined future period to the display data generation unit 225 and the communication device 71. The communication device 71 transmits the calculation result of the running cost calculation unit 224 to an external terminal by remote communication means (for example, wireless communication or wireless communication and Internet communication), and is installed in the work machine. The communication device 71 according to the present embodiment is connected to a vehicle body management database 73, which is an external terminal installed remotely from the work machine, via the Internet 72, and the calculation result of the running cost calculation unit 224 is used as the vehicle body management database. 73.

  As described above, when the calculation result of the running cost calculation unit 224 is transmitted to an external terminal at a remote location, the cumulative running cost changes when the battery 15 is replaced in a plurality of types of replacement cycles, as in the embodiment described above. Can also be monitored by the external terminal, so it is difficult for the administrator to directly manage the work machine (for example, when the operator of the work machine is not the administrator (for example, when the work machine is rented) However, as described in the previous embodiment, the battery replacement time of the work machine can be easily determined. Further, if the data stored in the vehicle body management database 73 is disclosed to the outside via the Internet or the like, it is possible to easily determine the battery replacement time of the work machine whenever the manager is in an Internet connection environment.

  In the present embodiment, the arithmetic processing accompanying the calculation of the accumulated running cost is mainly executed by the battery controller 22A installed in the work machine. However, the arithmetic processing is executed by the vehicle body management database 73. Only the internal resistance value of the battery 15 and the average fuel consumption from the vehicle body controller 11 may be transmitted to the vehicle body management database 73 via the communication device 71. With such a configuration, detailed analysis that cannot be performed by the battery controller 22A (microcomputer) installed in the work machine can be performed, and thus more accurate and abundant information can be provided to the administrator. Become.

  By the way, this invention is not limited to the content of the structure of each embodiment demonstrated above, A various deformation | transformation is possible. For example, in the description of each of the above embodiments, the battery replacement time is set to 1 year, 2 years, or 3 years, but the cumulative running cost when the battery is replaced in an arbitrary cycle is displayed. It is good also as a structure. In each of the above-described embodiments, the hybrid hydraulic excavator including the engine 7 and the power converter (generator motor) 10 has been described as an example. However, the full electric hydraulic pressure that is driven only by the storage battery without the engine 7 is described. It can also be applied to excavators. Further, the present invention can be applied not only to hydraulic excavators but also to other work machines such as wheel loaders, forklifts, and cranes.

3 Hydraulic actuator 6 Hydraulic pump 7 Engine 10 Power converter (generator motor)
11 Body controller (MCU)
12, 13 Inverter 15 Battery 16 Rotating motor 21 Engine controller (ECU)
22 Battery controller (BCU)
23 Monitor (display device)
71 Communication Device 73 Car Body Management Database 221 Deterioration Degree Diagnosis Unit 222 Deterioration Degree Change Calculation Unit 223 Fuel Consumption Improvement Rate Change Calculation Unit 224 Running Cost Calculation Unit 225 Display Data Generation Unit 226 Display Data Output Unit

Claims (5)

In a work machine including an actuator driven by one or both of a driving force of a prime mover and electric energy stored in a storage battery,
A deterioration degree change calculating means for calculating a change in the deterioration degree in the future based on the current deterioration degree of the storage battery;
A fuel consumption improvement rate change calculating means for calculating a change in fuel consumption improvement rate by the storage battery in the future based on the change in the deterioration degree;
For each case where the storage battery is replaced in a plurality of types of cycles, a running cost calculation means for calculating a change in cumulative running cost in a predetermined period in the future based on a change in the fuel efficiency improvement rate;
A work machine comprising: a display device that displays a change in accumulated running cost calculated for each replacement cycle of the storage battery for each replacement cycle. The work machine according to claim 1,
The running cost calculation means further calculates a change in the accumulated running cost in the predetermined period for a standard work machine that does not include a storage battery, and further calculates the accumulated running cost of the standard work machine and the replacement cycle of the storage battery. Calculate the difference from the calculated cumulative running cost,
The display device displays a difference in the calculated running cost for each replacement cycle. In the work machine according to claim 1 or 2,
The running cost calculation means further calculates a cumulative running cost of the predetermined period when the storage battery is not replaced based on a change in the fuel efficiency improvement rate,
The display device further displays a cumulative running cost when the storage battery is not replaced. The work machine according to claim 3,
The running cost calculation means further calculates a time when the cumulative running cost for each replacement cycle of the storage battery is lower than the cumulative running cost when the storage battery is not replaced in the predetermined period,
The display device displays a time when the cumulative running cost is lower. The work machine according to any one of claims 1 to 4,
A work machine further comprising a communication device that transmits a calculation result of the running cost calculation means to an external terminal.

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