JP2019120193A - Fuel consumption amount measurement system of working machine - Google Patents

Abstract

To provide a fuel consumption amount measurement system of a working machine which can measure fuel consumption amounts similar to those at the actual execution of the following motions of a working machine operation motion, a turning body turning motion and a traveling motion without performing these motions.SOLUTION: A fuel consumption amount measurement system of a working machine comprises: a hydraulic pump (20) for supplying a working fluid to a backflow oil path (24); a pressure regulation valve (26) which can regulate the discharge pressure of the working fluid in the backflow oil path; an internal combustion engine (10) for driving the hydraulic pump; fuel consumption amount measurement devices (15, 16 and 100) for measuring fuel consumption amounts of the fuel of the internal combustion engine; and a control device (100) for storing load data (T(t)) equivalent to an actual operation load of the internal combustion engine as a target load, and controlling an output of the internal combustion engine by drive-controlling a capacity variable unit (21) of the hydraulic pump, or the pressure regulation valve so that a load acting on the internal combustion engine indicating a product of the discharge pressure and discharge amounts of the hydraulic pump reaches a target load, and controlling the output of the internal combustion engine. The fuel consumption amount measurement devices adjust the discharge amounts of the hydraulic pump by using the control device, or the discharge pressure of the hydraulic pump by using the pressure regulation valve, and measure the fuel consumption amounts in a period in which the output of the internal combustion engine is controlled.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a fuel consumption measurement system for work machines.

  In work machines, such as hydraulic shovels, work machines such as booms and arms for excavating, and swing bodies for turning are operated hydraulically, and usually engines powered by gasoline or light oil (internal combustion engine) Is operated to supply hydraulic pressure to the working machine and the hydraulic equipment of the rotating body.

  In such a working machine, the amount of fuel consumption necessary for the operation and travel of the hydraulic pump is one of the important parameters representing the performance of the working machine, and the fuel consumption is accurately measured, and the fuel consumption data is measured. Is an important factor for both manufacturers of work machines and users of work machines.

  However, in order to measure the working fuel consumption of a hydraulic shovel, for example, excavable soil, turning, and a space for traveling are required. In particular, in a large hydraulic excavator used in a mine or the like, a large amount of soil and a very wide space are required, and there is a problem that the working fuel consumption can not be easily measured.

  On the other hand, although a car is typical as a machine driven by an engine, for example, as a method of measuring fuel consumption of a car, a virtual engine map is generated based on engine characteristic information without actually driving the car. There is known a technology for estimating fuel consumption from this engine map by simulation (Patent Document 1).

JP, 2013-137023, A

  In the technology described in Patent Document 1 above, fuel consumption estimation is performed based on engine characteristic information. However, unlike a car, working machines, especially hydraulic excavators with large load fluctuations, which frequently operate working machines such as booms and arms, differ from fuel efficiency data obtained from the engine characteristic information of a single engine and actual fuel efficiency. It is considered to be large, and there is a problem that the fuel efficiency estimation by simulation is unreliable. This problem is more remarkable as the working machine becomes larger like the above-mentioned large hydraulic excavator.

  The present invention has been made to solve such problems, and the fuel consumption equivalent to the actual operation of the working machine without performing the work operation of the work machine, the turning operation of the revolving unit, and the traveling operation is performed. It is an object of the present invention to provide a working machine fuel consumption measuring system capable of measuring quantity.

  In order to achieve the above object, the fuel consumption measuring system for a working machine according to the present invention is drawn from a hydraulic oil tank storing hydraulic oil, a variable displacement hydraulic pump, and the hydraulic pump from the hydraulic oil tank. A suction oil path for supplying hydraulic oil, a return oil path for discharging hydraulic oil discharged from the hydraulic pump to the hydraulic oil tank, and a return oil path connected in the middle of the return oil path to adjust the discharge pressure of the hydraulic oil A pressure control valve, an internal combustion engine for driving the hydraulic pump, a fuel tank for storing fuel supplied to the internal combustion engine, and a fuel consumption measuring device for measuring the consumption of the fuel used for the internal combustion engine A load acting on the internal combustion engine indicated by a product of a discharge pressure and a discharge amount of the hydraulic pump, the storage unit storing, as a target load, load data corresponding to an actual operation load of the internal combustion engine in time series; The fuel consumption measuring device includes: a control device that drives and controls at least one of the variable displacement unit of the hydraulic pump and the pressure adjusting valve to achieve the target load and controls the output of the internal combustion engine; While controlling the output of the internal combustion engine by adjusting at least one of the discharge amount of the hydraulic pump or the discharge pressure of the hydraulic pump by the pressure adjustment valve so that the load acting on the internal combustion engine becomes the target load by the device. The amount of consumption of the fuel used in the internal combustion engine is measured.

  As a result, the amount of fuel consumed by the internal combustion engine of the working machine that operates the variable displacement hydraulic pump with the internal combustion engine corresponds to the load data corresponding to the actual load acting on the internal combustion engine by the work machine operation. Drive control at least one of the variable capacity unit of the hydraulic pump or the pressure regulating valve so that the load acting on the internal combustion engine indicated by the product of the discharge pressure and the discharge amount of the hydraulic pump is used as a target load in time series. By controlling the output of the internal combustion engine and measuring the amount of fuel consumed by the internal combustion engine during this time, it is possible to easily measure without actually performing work on the working machine.

  Preferably, the control device drives and controls the variable displacement unit such that a load acting on the internal combustion engine becomes the target load while keeping the discharge pressure of the hydraulic pump constant by the pressure adjustment valve. It is better to adjust the discharge rate of the pump.

  Thus, the discharge amount of the hydraulic pump can be varied by adjusting the discharge amount of the hydraulic pump while maintaining the discharge pressure constant among the discharge pressure and the discharge amount of the hydraulic pump that contributes to the load acting on the internal combustion engine. The load acting on the internal combustion engine can be easily set as the target load based on the load data.

  Preferably, the control device controls the discharge pressure of the hydraulic pump by driving and controlling the pressure adjusting valve such that a load acting on the internal combustion engine becomes the target load while keeping the discharge amount of the hydraulic pump constant. It is good to adjust.

  As a result, of the discharge pressure and the discharge amount of the hydraulic pump that contributes to the load acting on the internal combustion engine, the discharge pressure of the hydraulic pump is maintained constant while the discharge pressure of the hydraulic pump is adjusted by the pressure adjustment valve. The load acting on the internal combustion engine can be easily set as the target load based on the load data simply by varying the discharge pressure of the hydraulic pump by the adjusting valve.

  Preferably, the fuel consumption measuring device includes a flow meter that measures the flow rate of the fuel flowing between the fuel tank and the internal combustion engine, and the fuel consumption measuring device measures the flow rate of the fuel based on the flow rate of the fuel measured by the flow meter. It is good to measure consumption.

  Thus, the fuel consumption can be easily measured by measuring the flow rate of the fuel flowing between the fuel tank and the internal combustion engine with a flow meter. In particular, when the internal combustion engine is a diesel engine, it has a fuel supply line for supplying fuel from the fuel tank and a fuel return line for returning fuel to the fuel tank, and the fuel supply line and the fuel return line It is possible to easily measure the consumption of fuel by providing a flow meter and integrating the difference in the flow rate of fuel measured by each flow meter.

  According to the fuel consumption measuring system for a working machine of the present invention, load data corresponding to an actual working load acting on an internal combustion engine by work of the working machine is used as a target load in time series, and discharge pressure and discharge amount of hydraulic pump The output of the internal combustion engine is controlled by driving and controlling at least one of the variable displacement unit of the hydraulic pump and the pressure control valve so that the load acting on the internal combustion engine indicated by the product becomes the target load. Since the amount of fuel consumption is measured, the simple configuration is carried out without actually performing the work with the work machine, for example, without performing the work operation of the work machine and the turning operation and traveling operation of the swing body in the hydraulic shovel And, it is possible to save the space, and to measure the consumption of fuel in the internal combustion engine of the working machine without being inferior to the case of actual operation.

  Also, instead of actually performing work with the work machine, the load equivalent to the actual work is applied to the hydraulic pump in a pseudo manner with the pressure control valve, so there is no need for the actual work, and an operator who operates the work machine is unnecessary. Since the control of the variable capacity unit of the hydraulic pump and the pressure control valve and the output control of the internal combustion engine are automatically performed by the control device, labor saving can be achieved in the measurement of the fuel consumption.

  Here, when the internal combustion engine is moving at a certain rotational speed, an output (rotational speed × torque) is derived from the torque at this time, but the pressure measured between the hydraulic pump and the pressure control valve (discharge pressure The product of the discharge pressure and the discharge amount corresponds to the output of the internal combustion engine if it is converted to the product of the discharge amount and the discharge amount.

It is a figure which shows schematic structure of the fuel consumption measurement system of the working machine which concerns on this invention. FIG. 2 is a block diagram showing a configuration and a connection state of a controller according to Embodiment 1. 5 is a flowchart showing a control routine of fuel consumption measurement according to the first embodiment. 5 is a timing chart showing temporal changes in load data T (t), a target hydraulic pressure Pc, and a displacement volume V (t) according to the first embodiment. FIG. 7 is a block diagram showing a configuration and a connection state of a controller according to Embodiment 2. It is a flowchart which shows the control routine of the fuel consumption measurement which concerns on Embodiment 2. FIG. It is a timing chart which shows change over time of load data T (t) concerning a 2nd embodiment, target displacement volume Vc, and oil pressure P (t).

Embodiment 1
FIG. 1 shows a schematic configuration of a fuel consumption measuring system for a working machine according to the present invention.
Here, a fuel consumption measurement system applied to a hydraulic shovel, which is one of working machines, will be described as an example.

  In the fuel consumption measurement system, an engine (internal combustion engine) 10 and a hydraulic pump 20 driven by the engine 10 are disposed to simulate an actual hydraulic system of a hydraulic excavator. The hydraulic pressure is generated by driving the motor. For example, a diesel engine is employed as the engine 10.

  As shown in FIG. 1, a fuel tank 12 is disposed in the vicinity of the engine 10, and the engine 10 includes a fuel supply line 13 for supplying fuel from the fuel tank 12 to the engine 10 and a return from the engine 10. A fuel return line 14 for returning fuel to the fuel tank 12 is connected.

  The fuel supply line 13 is provided with a flow meter (a fuel consumption measuring device) 15 for measuring the flow rate Qs of the fuel supplied to the engine 10, and the fuel return line 14 contains the fuel returned from the engine 10. A flow meter (fuel consumption measuring device) 16 for measuring the flow rate Qr is provided.

  The hydraulic pump 20 is a variable displacement hydraulic pump that includes an electromagnetically driven regulator unit (capacity variable unit) 21 and is capable of changing the discharge amount by controlling the driving of the regulator unit 21, and has a drive shaft It is connected to the output shaft of the engine 10, and the discharge amount and the discharge pressure can be adjusted by varying the capacity by the regulator unit 21 or increasing or decreasing the output of the engine 10. In more detail, the hydraulic pump 20 is, for example, a swash plate type hydraulic pump, and by adjusting the tilt angle of the swash plate by the regulator unit 21, the displacement volume and hence the discharge amount can be changed.

  One end of a suction oil passage 23 is connected to the suction port of the hydraulic pump 20, and the other end of the suction oil passage 23 is in communication with, for example, the lower portion of the hydraulic oil tank 22. Further, one end of a return oil passage 24 is connected to the discharge port of the hydraulic pump 20, and the other end of the return oil passage 24 is in communication with, for example, the upper portion of the hydraulic oil tank 22.

  A solenoid proportional valve (pressure regulating valve) 26 capable of adjusting the opening degree of the reflux oil path 24 is interposed in the reflux oil path 24, and the opening degree of the solenoid proportional valve 26 is adjusted. Thus, it is possible to adjust the hydraulic pressure (discharge pressure) on the hydraulic pump 20 side in the return oil passage 24.

  In addition, a pressure sensor 28 is provided at the upstream portion of the return oil passage 24 on the hydraulic pump 20 side of the solenoid proportional valve 26. The pressure sensor 28 is discharged from the hydraulic pump 20 and adjusted by the solenoid proportional valve 26. The oil pressure in the oil return oil passage 24 can be measured.

  In the present system, a controller (control device, fuel consumption measuring device) 100 including an input / output device, a storage device (ROM, RAM, non-volatile RAM, etc.), a central processing unit (CPU), a timer counter, etc. The controller 100 provides comprehensive control of the fuel consumption measurement system according to the present invention.

  Referring to FIG. 2, a configuration and a connection state of the controller 100 according to the first embodiment of the present invention are shown in a block diagram. In the figure, an input unit 102 and an output unit 104 correspond to an input / output device, a storage unit 106 corresponds to a storage device, and an arithmetic processing unit 108 corresponds to a central processing unit or a timer counter. The arithmetic processing unit 108 includes an output value calculation unit 110 that calculates output values for operating the fuel control unit 11 of the engine 10, the regulator unit 21 and the solenoid proportional valve 26, and a fuel consumption amount that calculates the fuel consumption amount. A computing unit 112 is provided.

  A flowmeter 15, a flowmeter 16 and a pressure sensor 28 are electrically connected to the input unit 102 of the controller 100, and the flow rate signal of fuel flowing through the fuel supply line 13 detected by the flowmeter 15 is detected by the flowmeter 16 In addition to the flow rate signal of the fuel flowing through the fuel return line 14 and the pressure signal of the hydraulic oil detected by the pressure sensor 28 respectively, time series load simulating the load acting on the engine 10 by the work of the hydraulic shovel Data T (t) and a target hydraulic pressure Pc in the return oil passage 24 are input.

  Here, the load data T (t) is the engine 10 by the work of the hydraulic shovel carried out at the time of measurement of the normal fuel consumption, for example, digging by work tools such as a boom and an arm and earthing and turning of a revolving structure etc. Is a series of data corresponding to the working load set in time series over a certain period, simulating the working load acting on the road, and is preset according to the specifications of the hydraulic shovel, and at the time of measuring the fuel consumption The load is appropriately input to the input unit 102 and stored in the storage unit 106 as a target load for changing over time the load acting on the engine 10. Further, the target hydraulic pressure Pc is a hydraulic pressure set by simulating an average hydraulic pressure generated in the return oil passage 24 at the time of work of the hydraulic shovel carried out at the time of measurement of the normal fuel consumption. These values are set according to the specifications of the above, and are appropriately input to the input unit 102 at the time of measurement of the fuel consumption, and stored in the storage unit 106.

On the other hand, the fuel control unit 11 of the engine 10, the regulator unit 21, the solenoid proportional valve 26, and the monitor 120 are electrically connected to the output unit 104 of the controller 100.
Thus, based on the load data T (t) stored in the storage unit 106, information on the target hydraulic pressure Pc, and input information from the pressure sensor 28, the output value calculation unit 110 of the arithmetic processing unit 108 outputs to the regulator unit 21. The value, the output value to the solenoid proportional valve 26, and the output value to the fuel control unit 11 are calculated, and the capacity variable signal is supplied from the output unit 104 to the regulator unit 21, and the discharge amount of the hydraulic pump 20 is adjusted. A control signal is supplied to the valve 26, the degree of opening and closing of the solenoid proportional valve 26 is adjusted, a fuel control signal is supplied to the fuel control unit 11, and the output of the engine 10 is controlled.

  Then, when the output of the engine 10 is controlled based on the load data T (t) and the target hydraulic pressure Pc, the fuel consumption calculation unit 112 of the arithmetic processing unit 108 based on the input information from the flow meter 15 and the flow meter 16. The consumption amount of fuel used in the engine 10 is calculated and displayed on the monitor 120, for example.

  More specifically, the storage unit 106 of the controller 100 changes over time the target load acting on the engine 10 based on the load data T (t) to change the hydraulic pressure P in the return oil passage 24 to the target hydraulic pressure Pc. A program is stored that operates the regulator unit 21 and the proportional solenoid valve 26 so that the load acting on the target load is the target load, and controls the output of the engine 10. Thus, in the present system, by operating the program, the regulator unit 21 and the solenoid proportional valve 26 are adjusted such that a load corresponding to the load data T (t) acts on the engine 10 under the target hydraulic pressure Pc. The output of the engine 10 is controlled according to the load.

Hereinafter, the operation and effects according to the first embodiment of the fuel consumption measurement system configured as described above will be described.
Referring to FIG. 3, a control routine of fuel consumption measurement according to the first embodiment executed according to the above program in the controller 100 is shown by a flowchart, which will be described below along the flowchart.

  When fuel consumption measurement is started, first, in step S0, based on time-series load data T (t) and target hydraulic pressure Pc, time series of hydraulic pump 20 that fluctuates according to load data T (t) The displacement volume V (t) is calculated and stored in the storage unit 106.

The load data T (t) corresponds to the torque exerted by the hydraulic pump 20, and between the load data T (t), the hydraulic pressure P and the displacement volume V (t), the torque data exerted by the hydraulic pump 20 is Based on the equation, the relationship of the following equation (1) is established.
T (t) = μ × (P × V (t)) / 2π (1)
Here, μ indicates the efficiency of the pump.

From this, with regard to the displacement volume V (t), the hydraulic pressure P can be determined as the target hydraulic pressure Pc and the equation (1) is calculated backward.
In this way, when the displacement volume V (t) is obtained based on the load data T (t) and the target hydraulic pressure Pc, the work of the hydraulic shovel is, for example, a series of "digging → turning boom raising → release → turning return". When the operation is repeated, temporal changes in the load data T (t), the target hydraulic pressure Pc, and the displacement volume V (t) can be illustrated as shown in the timing chart of FIG. In FIG. 4, the solid line indicates load data T (t), the alternate long and short dash line indicates the target hydraulic pressure Pc, the broken line indicates the displacement volume V (t), and the vertical axis indicates the magnitude of each value. .

Returning to the flowchart of FIG. 3, the engine 10 is started in step S10.
In step S12, the solenoid proportional valve 26 is adjusted so that the hydraulic pressure P of the return oil passage 24 becomes the target hydraulic pressure Pc, and the hydraulic pressure P reaches the target hydraulic pressure Pc based on the information from the pressure sensor 28 in step S14 It is determined whether P = Pc).

  If the determination result in step S14 is false (No) and it is determined that the hydraulic pressure P has not yet reached the target hydraulic pressure Pc, the process returns to step S12 and waits for the hydraulic pressure P to reach the target hydraulic pressure Pc. On the other hand, when the determination result in step S14 is true (Yes) and it is determined that the hydraulic pressure P has reached the target hydraulic pressure Pc, the process proceeds to step S16.

  In step S16, the inclination angle of the swash plate is adjusted by the regulator unit 21 so that the displacement volume V of the hydraulic pump 20 becomes the displacement volume V (t) obtained as described above. At this time, the electromagnetic proportional valve 26 is also appropriately controlled based on the information from the pressure sensor 28 so that the hydraulic pressure P of the return oil passage 24 is held at the target hydraulic pressure Pc. As a result, a load corresponding to the load data T (t) acts on the engine 10. For example, the output value calculation unit 110 calculates the output value of the engine 10 in order to keep the engine rotational speed constant. A fuel control signal is output to the fuel control unit 11 based on the output value, and the output of the engine 10 is controlled.

  In step S18, the flow rate Qs of the fuel flowing through the fuel supply line 13 and the flow rate Qr of the fuel flowing through the fuel return line 14 are respectively measured by the flow meter 15 and the flow meter 16, and these flow rates Qs and Qr are stored in the storage unit 106. Are temporarily stored in

  In step S20, it is determined whether the load data T (t) for a fixed period has ended and the displacement volume V (t) has ended in accordance with the end of the load data T (t). If the determination result in step S20 is false (No) and it is determined that the displacement volume V (t) has not ended yet, the operations in step S16 and step S18 are continuously repeated. As a result, while the output of the engine 10 is controlled according to the displacement volume V (t), the flow rate Qs of fuel flowing through the fuel supply line 13 and the flow rate Qr of fuel flowing through the fuel return line 14 are The measured values of the flow rate Qs and the flow rate Qr are continuously stored in the storage unit 106 in time series, respectively. If the determination result in step S20 is true (Yes) and it is determined that the displacement volume V (t) has ended, the process proceeds to step S22.

In step S22, the fuel consumption calculation unit 112 calculates the fuel consumption based on the measured values of the flow rate Qs and the flow rate Qr accumulated in the storage unit 106 in time series. The fuel consumption amount is calculated based on the following equation (2) in which the difference between the flow rate Qs and the flow rate Qr is multiplied by the sampling period Δt and then added.
Fuel consumption = ((Qs-Qr) x Δt (2)

  Thus, the fuel consumption is obtained and the routine ends. As a result, the measurement of a series of fuel consumption is completed, and the fuel consumption per fixed time, for example, a fixed time or a fixed number of work is obtained.

  As described above, in the fuel consumption measurement system according to the first embodiment of the present invention, using the time-series load data T (t) simulating the load acting on the engine 10 by the work of the hydraulic shovel, the load The time-series displacement V (t) of the hydraulic pump 20 when the hydraulic pressure P of the return oil passage 24 is the target hydraulic pressure Pc is determined from the data T (t), and the displacement V of the hydraulic pump 20 is the displacement V By adjusting the tilt angle of the swash plate so as to become t), a load is applied to the engine 10, the output control of the engine 10 is automatically performed, and the fuel consumption of the engine 10 is obtained.

  As a result, the load equivalent to performing these operations is applied to the engine 10 without actually performing the work operation of the working machine, the turning operation of the turning body, and the traveling operation in the hydraulic shovel, thereby controlling the output of the engine 10 The fuel consumption of the engine 10 can be determined with a simple configuration. In addition, since an operator actually operating the hydraulic shovel is unnecessary, and control of the regulator unit 21, the solenoid proportional valve 26, and the engine 10 is automatically performed by the controller 100, labor saving can be achieved in the measurement of the fuel consumption. be able to.

Second Embodiment
In the first embodiment, the displacement volume V (t) of the hydraulic pump 20 is determined according to the load data T (t) so that the oil pressure P in the return oil passage 24 becomes the target oil pressure Pc. Is set to change the displacement V of the hydraulic pump 20 to the target displacement Vc based on the equation (1), and the hydraulic pressure in the return oil passage 24 according to the load data T (t). P may be changed. In the second embodiment, the case where the fuel consumption is measured by changing the hydraulic pressure P will be described. Also in the second embodiment, the schematic configuration of the fuel consumption measurement system is as shown in FIG. 1, and here, parts different from the first embodiment will be described.

  Referring to FIG. 5, the configuration and connection of the controller 100 'according to the second embodiment of the present invention is shown in a block diagram. As shown in the figure, in the second embodiment, a target displacement volume Vc is input instead of the target hydraulic pressure Pc of the first embodiment.

  Therefore, in the second embodiment, a program assembled to drive and control the regulator unit 21 and the proportional solenoid valve 26 and to control the output of the engine 10 so that the displacement volume V of the hydraulic pump 20 becomes the target displacement volume Vc is used. Ru.

Hereinafter, the operation and effects according to the second embodiment of the fuel consumption measurement system configured as described above will be described.
Referring to FIG. 6, a control routine of fuel consumption measurement according to the second embodiment, which is executed in the controller 100 ', is shown by a flowchart, which will be described below along the flowchart.

  When fuel consumption measurement is started, first, in step S0 ′, based on time-series load data T (t) and target displacement volume Vc, in return oil passage 24 according to load data T (t) The time-series hydraulic pressure P (t) is calculated and stored in the storage unit 106. For the hydraulic pressure P (t), in the above equation (1), let the displacement V (t) of the hydraulic pump 20 be the target displacement volume Vc, and back calculate the above equation (1) with the hydraulic pressure P as the hydraulic pressure P (t). You can ask for

  In this way, when the hydraulic pressure P (t) is obtained based on the load data T (t) and the target displacement volume Vc, the work of the hydraulic shovel is, for example, a series of "digging → turning boom raising → release → turning return". In the case where the work is repeated, temporal changes in the load data T (t), the target displacement volume Vc and the hydraulic pressure P (t) may be illustrated as in the timing chart of FIG. 7 as in FIG. it can. In FIG. 7, the solid line indicates load data T (t), the alternate long and short dash line indicates hydraulic pressure P (t), the broken line indicates target displacement volume Vc, and the vertical axis indicates the magnitude of each value. .

  Returning to the flowchart of FIG. 6, when the engine 10 is started in step S10, in step S12 ′, the regulator unit 21 is drive-controlled so that the displacement volume V of the hydraulic pump 20 becomes the target displacement volume Vc. The tilt angle is adjusted.

  In step S16 ', the solenoid proportional valve 26 is driven and controlled so that the hydraulic pressure P in the return oil passage 24 becomes the hydraulic pressure P (t) obtained as described above. As a result, a load corresponding to the load data T (t) acts on the engine 10. For example, the output value calculation unit 110 calculates the output value of the engine 10 in order to keep the engine rotational speed constant. The said output value is output to the fuel control unit 11, and output control of the engine 10 is carried out.

  In step S18, the flow rate Qs of fuel flowing through the fuel supply line 13 and the flow rate Qr of fuel flowing through the fuel return line 14 are respectively measured by the flowmeter 15 and the flowmeter 16, and these flow rates Qs and Qr are temporarily stored in the storage unit It is stored in 106.

  In step S20 ', it is determined whether the load data T (t) for a predetermined period has ended and the hydraulic pressure P (t) has ended according to the end of the load data T (t). If the determination result in step S20 'is false (No) and it is determined that the hydraulic pressure P (t) has not ended yet, the operations in step S16' and step S18 are repeated. Thus, while the output of the engine 10 is controlled according to the hydraulic pressure P (t), the flow rate Qs of fuel flowing through the fuel supply line 13 and the flow rate Qr of fuel flowing through the fuel return line 14 are measured every sampling cycle of the flowchart. The measured values of the flow rate Qs and the flow rate Qr are continuously stored in the storage unit 106 in time series.

  If the determination result in step S20 'is true (Yes) and it is determined that the hydraulic pressure P (t) has ended, the process proceeds to step S22, and the fuel consumption calculation unit 112 accumulates the storage unit 106 in time series. The fuel consumption is calculated based on the equation (2) based on the measured values of the flow rate Qs and the flow rate Qr.

  As described above, in the fuel consumption measurement system according to the second embodiment of the present invention, using the time-series load data T (t) simulating the load acting on the engine 10 by the work of the hydraulic shovel, the load The time-series hydraulic pressure P (t) in the return oil passage 24 when the displacement V of the hydraulic pump 20 is the target displacement Vc is determined from the data T (t), and the hydraulic pressure P in the return oil passage 24 is the hydraulic pressure A load is applied to the engine 10 by controlling the drive of the solenoid proportional valve 26 so as to be P (t), the output control of the engine 10 is automatically performed, and the fuel consumption of the engine 10 is obtained.

  Thus, also in the second embodiment, as in the first embodiment, it is equivalent to actually performing these operations without performing the work operation of the working machine, the turning operation of the turning body, and the traveling operation in the hydraulic shovel. The load can be applied to the engine 10, the output of the engine 10 can be controlled, and the fuel consumption of the engine 10 can be obtained with a simple configuration, and labor saving can be achieved in the measurement of the fuel consumption.

Although the description of the embodiment is finished above, the aspect of the present invention is not limited to the above embodiment.
For example, in the above embodiment, although the case where the working machine is a hydraulic shovel has been described as an example, the working machine is not limited to a hydraulic shovel and is a working machine that uses an internal combustion engine as a drive source and load data If T (t) is obtained, the present invention is applicable.

Moreover, although the case where an internal combustion engine is a diesel engine was demonstrated to the example in the said embodiment, an internal combustion engine is not restricted to a diesel engine.
In the above embodiment, the hydraulic pump is, for example, a swash plate type variable displacement hydraulic pump 20, but the hydraulic pump is not limited to the swash plate type as long as it is a variable displacement type.

  Further, in the above embodiment, a fuel consumption measuring device (a fuel consumption calculating unit 112) which constitutes a control device for driving and controlling the regulator unit 21 and the solenoid proportional valve 26 by the controller 100 and 100 ′ and calculates the fuel consumption. However, the fuel consumption measuring device may be provided separately from the controller 100, 100 '.

  In the above embodiment, the flow rate Qs and the flow rate Qr are measured by the flow meter 15 and the flow meter 16, respectively, and the fuel consumption calculation unit 112 of the controller 100 or 100 ′ calculates the fuel consumption. The method of determining the fuel consumption is not limited to this. For example, the fuel consumption may be determined based on the amount of change of the fuel in the fuel tank 12.

10 Engine (internal combustion engine)
12 fuel tank 13 fuel supply line 14 fuel return line 15 flow meter (fuel consumption measuring device)
16 Flowmeter (Fuel Consumption Measurement Device)
20 hydraulic pump 21 regulator unit (variable volume unit)
22 hydraulic oil tank 23 suction oil passage 24 return oil passage 26 solenoid proportional valve (pressure regulating valve)
100 controller (control device, fuel consumption measuring device)
102 input unit 104 output unit 106 storage unit 108 computing unit 110 output value computing unit 112 fuel consumption computing unit

Claims (4)

A hydraulic oil tank for storing hydraulic oil,
With a variable displacement hydraulic pump,
A suction oil passage for supplying hydraulic fluid drawn from the hydraulic fluid tank to the hydraulic pump;
A return oil passage for discharging hydraulic oil discharged from the hydraulic pump to the hydraulic oil tank;
A pressure control valve connected in the middle of the return oil passage and capable of adjusting the discharge pressure of the hydraulic oil;
An internal combustion engine driving the hydraulic pump;
A fuel tank storing fuel supplied to the internal combustion engine;
A fuel consumption measuring device for measuring the consumption of the fuel used in the internal combustion engine;
It has a storage unit that stores load data corresponding to the actual load of the internal combustion engine as a target load in time series, and the load acting on the internal combustion engine indicated by the product of the discharge pressure and the discharge amount of the hydraulic pump is the target And a control device that drives and controls at least one of the variable displacement unit of the hydraulic pump and the pressure control valve so as to be a load, and controls the output of the internal combustion engine.
The fuel consumption measuring device adjusts at least one of a discharge amount of the hydraulic pump or a discharge pressure of the hydraulic pump by the pressure control valve such that a load acting on the internal combustion engine by the control device becomes the target load. A fuel consumption measurement system for a working machine, comprising measuring the consumption of the fuel used in the internal combustion engine while controlling the output of the internal combustion engine.   The control device drives and controls the variable displacement unit so that the load acting on the internal combustion engine becomes the target load while keeping the discharge pressure of the hydraulic pump constant by the pressure adjusting valve, and discharging the hydraulic pump. The fuel consumption measuring system for a working machine according to claim 1, wherein the amount is adjusted.   The control device controls the pressure adjustment valve so as to adjust the discharge pressure of the hydraulic pump so that the load acting on the internal combustion engine becomes the target load while keeping the discharge amount of the hydraulic pump constant. The fuel consumption measurement system of a working machine according to claim 1, characterized by   The fuel consumption measuring device includes a flow meter that measures the flow rate of the fuel flowing between the fuel tank and the internal combustion engine, and the consumption amount of the fuel is calculated based on the flow rate of the fuel measured by the flow meter. The fuel consumption measurement system for a working machine according to any one of claims 1 to 3, wherein the measurement is performed.

Images