Work vehicles

Abstract

To provide a work vehicle with which it is possible to supply electric power safely and appropriately, even when no dedicated power generator is installed, and lighting devices for work and other mounted electrical apparatuses consume a large amount of electric power.SOLUTION: A electric circuit of disaster prevention vehicles comprises: an alternator 15 belonging to a chassis, which is driven by the motive power of an engine 9 for traveling; a dedicated battery 19 for fitted items, which is charged by the alternator 15 or an external power supply; a lighting device 5 for work and a second fitted electrical apparatus 43 that operate upon receiving electric power from the dedicated battery 19 for fitted items; and a fitted item control unit 50 that controls electric power supply from the dedicated battery 19 for fitted items to the lighting device 5 for work and the second fitted electrical apparatus 43. The fitted item control unit 50 monitors a supplied current value to the second fitted electrical apparatus 43 and, when the supplied current value increases to or above a prescribed supply threshold, stops electric power supply from the dedicated battery 19 for fitted items to the second fitted electrical apparatus 43 and supplies electric power preferentially to the lighting device 5 for work.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a work vehicle equipped with a work lighting device and other mounted electrical equipment. [Background technology]

[0002] Conventionally, work vehicles have been used to smoothly support firefighting and rescue operations in the event of a fire or other disaster. Work vehicles equipped with hydraulic work equipment such as a crane or winch, work lighting and other mounted electrical equipment, and a generator for supplying power to the work lighting and other mounted electrical equipment have been proposed (see, for example, Patent Document 1). Some of the other mounted electrical equipment utilizes an AC 100V outlet provided on the vehicle. Some generators are mounted as part of the mounted equipment and are driven by power from the traveling engine taken off by a power take-off device. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2009-078924 Summary of the Invention [Problem to be solved by the invention]

[0004] Conventional work vehicles such as those described in Patent Document 1 are equipped with a loading bay for carrying materials and equipment necessary for supporting activities. In recent years, the shift to LED work lighting, increased chassis weight, and increased loads of materials and equipment have led to a growing demand for vehicles without generators. This is because generators driven by power extracted from the driving engine by a power take-off device are large-scale, and installing one on a vehicle would sacrifice both loading space and load weight.

[0005] However, in work vehicles without generators, the auxiliary lead battery attached to the chassis serves as the power source for the work lighting system and other mounted electrical equipment, which places a heavy burden on the lead battery, making it difficult to maintain a constant remaining battery charge.

[0006] The present invention has been made in consideration of these points, and its purpose is to provide a work vehicle that does not have a generator dedicated to the mounted equipment and can provide a stable and appropriate power supply even when the power consumption of the work lighting device and other mounted electrical equipment as a whole is high. [Means for solving the problem]

[0007] The present invention provides a means for solving the above-mentioned problems as follows: That is, a first invention is a vehicle comprising a running engine, a chassis alternator driven by the power of the running engine, a battery dedicated to the mounted object that is charged by the alternator or an external power source, a work lighting device that operates on the power of the battery dedicated to the mounted object, mounted electrical equipment that operates on the power of the battery dedicated to the mounted object, and a mounted object control unit that controls the supply of power from the battery dedicated to the mounted object to the work lighting device and the mounted electrical equipment, The mounted object control unit is configured to monitor the supply current value to the mounted electrical equipment, and when the supply current value becomes equal to or greater than a predetermined supply threshold, stop the supply of power from the mounted object-dedicated battery to the mounted electrical equipment and supply power preferentially to the work lighting device.

[0008] According to the first invention, the work lighting device and the mounted electrical equipment can be operated using power from a newly installed battery dedicated to the mounted equipment, rather than from the auxiliary battery provided by the chassis manufacturer. Because the auxiliary battery provided by the chassis is primarily intended to supply power to the driving-related equipment, its battery capacity alone is insufficient to power the work lighting device and the many mounted electrical equipment. In contrast, the battery dedicated to the mounted equipment, which is installed in addition to the auxiliary battery, can be set to a battery capacity that can adequately supply power to the work lighting device and the mounted electrical equipment. This eliminates the risk of the auxiliary battery being unable to supply power to the driving-related equipment due to insufficient battery charge, and allows for a stable power supply to the work lighting device and the mounted electrical equipment.

[0009] Furthermore, when the current value supplied to the mounted electrical equipment exceeds a predetermined supply threshold, the mounted equipment control unit stops the power supply from the mounted battery to the mounted electrical equipment and prioritizes the supply of power to the work lighting device. This reliably prevents the work lighting device, which is important for ensuring the visibility of active personnel, from going out due to a power shortage during operation. This makes it possible to create a work vehicle that can appropriately supply power.

[0010] A second invention is characterized in that in the first invention, the dedicated battery for the mounted object is a lithium ion battery.

[0011] According to the second invention, a lithium-ion battery is used which is lighter, more compact and has a larger capacity than the lead battery used for the auxiliary equipment battery. This reduces the installation space for the battery dedicated to the mounted object, ensuring space for storing loaded equipment and the load weight, while also being able to handle cases where the power consumption of the mounted electrical equipment as a whole is large.

[0012] The third invention is characterized in that, in the first or second invention, the alternator and the battery dedicated to the mounted object are connected by a power supply line, an energizing relay is interposed in the power supply line, and the mounted object control unit is configured to cut off the power supply from the alternator to the battery dedicated to the mounted object by the energizing relay until a predetermined delay time is reached after the alternator is started.

[0013] According to the third invention, when the alternator is started and the power supply becomes unstable, power from the alternator can be prevented from being supplied to the battery dedicated to the mounted object, thereby preventing the battery dedicated to the mounted object from breaking down due to the input of abnormal voltage or current.

[0014] The fourth invention is characterized in that, in any one of the first to third inventions, it comprises an auxiliary battery charged by the alternator, and a switching relay that switches between supplying power from the auxiliary battery to the mounted electrical equipment or from the mounted object dedicated battery to the mounted electrical equipment, and the mounted object control unit is configured to activate the switching relay to switch the power supply from the auxiliary battery to the mounted electrical equipment when the supply current value becomes greater than or equal to the supply threshold.

[0015] According to the fourth aspect of the present invention, when the current value supplied to the mounted electrical equipment exceeds a predetermined supply threshold, the power supply from the dedicated battery for the mounted equipment to the mounted electrical equipment is stopped, but the mounted electrical equipment is supplied with power from the auxiliary battery. This makes it possible to supply power to both the work lighting device and the mounted electrical equipment using two types of batteries, the dedicated battery for the mounted equipment and the auxiliary battery. Furthermore, the work lighting device, which is important for ensuring the visibility of active personnel, is supplied with power from the dedicated battery for the mounted equipment, which has a larger capacity than the auxiliary battery. This allows for more appropriate power supply.

[0016] The fifth invention is characterized in that, in any one of the first to fourth inventions, the mounted object control unit has a battery remaining capacity acquisition unit that acquires the remaining battery capacity of the battery dedicated to the mounted object, and is connected to the engine control unit of the driving engine, and is configured to increase and control the rotation speed of the driving engine via the engine control unit in response to a decrease in the remaining battery capacity acquired by the battery remaining capacity acquisition unit.

[0017] According to the fifth aspect of the present invention, when the remaining battery charge becomes low, the engine speed is increased to increase the amount of power generated per unit time by the alternator, thereby allowing the remaining battery charge to be restored to a sufficient amount in a short period of time.

[0018] The sixth invention is characterized in that, in any one of the first to fifth inventions, the vehicle is provided with a hydraulic pump driven by power extracted from the traveling engine, a hydraulic working device driven by power from the hydraulic pump, and a hydraulic sensor for detecting that the hydraulic working device is in operation, and the mounted object control unit is configured not to perform control to increase the engine speed of the traveling engine in response to a decrease in the remaining battery charge when it determines that the hydraulic working device is in operation based on a signal from the hydraulic sensor.

[0019] According to the sixth aspect of the present invention, it is possible to prevent a sudden increase in engine speed while the hydraulic working device is in operation, which would change the hydraulic oil discharge flow rate of the hydraulic pump and cause the operation of the hydraulic working device to become unstable, thereby ensuring safety. [Effects of the Invention]

[0020] The work vehicle according to the present invention can stably supply power to the work lighting device and mounted electrical equipment without the risk of being unable to supply power to the driving-related equipment due to a lack of remaining battery charge in the auxiliary battery. Furthermore, it can reliably prevent the work lighting device, which is important for ensuring the visibility of active personnel, from going out due to a lack of power during the operation. This allows for a work vehicle that can appropriately supply power. [Brief explanation of the drawings]

[0021] [Figure 1] 1 is a side view of a disaster prevention vehicle according to an embodiment of the present invention. [Figure 2] 1 is an electrical circuit diagram showing a configuration for supplying power to a work lighting device and other mounted electrical equipment of a disaster prevention vehicle according to this embodiment. FIG. [Figure 3] FIG. 2 is a control block diagram of the disaster prevention vehicle according to the present embodiment. [Figure 4] 1 is a schematic diagram showing a configuration for hydraulically driving a hydraulic working device of a disaster prevention vehicle according to an embodiment of the present invention. FIG. [Figure 5] 4 is a flow chart for explaining charging and power supply control of the disaster prevention vehicle according to the present embodiment. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0022] Hereinafter, a disaster prevention vehicle according to an embodiment of the present invention will be described with reference to the drawings.

[0023] Fig. 1 shows a disaster prevention vehicle 1 as a work vehicle according to one embodiment of the present invention. In Fig. 1, the disaster prevention vehicle 1 of this embodiment is equipped with a cab 2 provided at the front of the vehicle, a loading bay 3 provided behind the cab 2 for loading materials and equipment necessary for activity support, a hydraulic work device 60 which is a crane provided behind the loading bay 3, and a work lighting device 5 provided above the loading bay 3.

[0024] The cab 2 is a double cab, with a driver's seat in the front row and a rear seat in the back row where multiple team members can sit (not shown). An air conditioner 7 is installed above the rear seats in the cab 2 to improve the comfort of the team members. Under the floor of the driver's seat and the rear seats are a running engine 9, an alternator 15 attached to the chassis that is driven by the power of the running engine 9, and a clutch and transmission unit 11 connected to the rear end of the running engine 9. Power is transmitted from the running engine 9 to the alternator 15 by an alternator belt 14.

[0025] The clutch and transmission section 11 is provided with a power take-off device 12 for taking out power from the traveling engine 9. One end of a PTO shaft 13 is connected to a power take-off port of the power take-off device 12, and the other end of the PTO shaft 13 is connected to a hydraulic pump 17.

[0026] An auxiliary battery 18 and a dedicated battery 19 for the mounted equipment are provided under the loading bay 3. The auxiliary battery 18 is a lead battery and is a chassis accessory that supplies power mainly to chassis electrical equipment 46 (see FIG. 2). The chassis electrical equipment 46 includes, for example, the headlight 6 provided in the cab 2. A lithium-ion battery is used for the dedicated battery 19 for the mounted equipment. The lithium-ion battery has a large capacity compared to the lead battery used for the auxiliary battery 18, and is lightweight and compact compared to its capacity. The dedicated battery 19 for the mounted equipment is provided with a battery control unit 27 for monitoring the remaining battery charge (see FIG. 2). The dedicated battery 19 for the mounted equipment supplies power to the work lighting device 5 to operate it.

[0027] FIG. 2 is an electrical circuit diagram showing a configuration for supplying power to the work lighting device 5 and other mounted electrical equipment of the disaster prevention vehicle 1 according to this embodiment. In FIG. 2, the alternator 15 is connected to the first mounted electrical equipment 44 via a first power supply line 71. The first mounted electrical equipment 44 may be, for example, a red light 8 (see FIG. 1) provided on the side of the loading bay 3. An auxiliary battery 18 is connected to the first power supply line 71. The auxiliary battery 18 is charged by the alternator 15. An input monitoring current sensor 23 is connected to the first power supply line 71 between the alternator 15 and the auxiliary battery 18. The input monitoring current sensor 23 monitors the current value input from the alternator 15 to the auxiliary battery 18. An output monitoring current sensor 24 is connected to the first power supply line 71 between the auxiliary battery 18 and the first mounted electrical equipment 44. The output monitoring current sensor 24 monitors the value of the current output from the auxiliary battery 18 .

[0028] A second power supply line 72 branches off from the first power supply line 71 between the alternator 15 and the input monitoring current sensor 23. The second power supply line 72 is connected to chassis electrical equipment 46 such as the headlights 6. A third power supply line 73 branches off from the first power supply line 71 between the output monitoring current sensor 24 and the first mounted electrical equipment 44. The third power supply line 73 is connected to the input side of an energizing relay 21. The energizing relay 21 cuts off the power supply when in the OFF state and allows the power supply when in the ON state. The output side of the energizing relay 21 is connected to the input side of the mounted-object battery 19 by a fourth power supply line 74. A fourth diode 41 is provided in the fourth power supply line 74, and allows only current flowing in the direction from the output side of the energizing relay 21 to the mounted-object battery 19. Furthermore, a current line from an external power source is connected to the fourth power supply line 74 via the fifth diode 42. As a result, the alternator 15 and the attached-object battery 19 are connected by the first power supply line 71, the third power supply line 73, and the fourth power supply line 74.

[0029] A fifth power supply line 75 branches off from the third power supply line 73 between the branch point with the first power supply line 71 and the energizing relay 21. The tip of the fifth power supply line 75 is connected to the work lighting device 5. A second DC-DC converter 33 and a second diode 38 are provided between the branch point with the third power supply line 73 on the fifth power supply line 75 and the work lighting device 5. The second diode 38 only allows current to flow from the output side of the second DC-DC converter 33 to the work lighting device 5.

[0030] A sixth power supply line 76 branches off from the fifth power supply line 75 between the branch point with the third power supply line 73 and the input side of the second DC-DC converter 33. The tip of the sixth power supply line 76 is connected to the changeover relay 22. A seventh power supply line 77 branches off from the sixth power supply line 76 between the branch point with the fifth power supply line 75 and the input side of the changeover relay 22, and the tip of the seventh power supply line 77 is connected between the second diode 38 on the fifth power supply line 75 and the work lighting device 5. The first DC-DC converter 32 and a first diode 37 located on the output side of the first DC-DC converter 32 are interposed in the seventh power supply line 77. The first diode 37 allows current only in the direction from the output side of the first DC-DC converter 32 to the work lighting device 5.

[0031] The output side of the mounted-body-dedicated battery 19 and the fifth power supply line 75 are connected by an eighth power supply line 78. The third DC-DC converter 34 and a third diode 39 located on the output side of the third DC-DC converter 34 are disposed on the eighth power supply line 78. The third diode 39 only allows current to flow in the direction from the output side of the third DC-DC converter 34 to the work lighting device 5. A ninth power supply line 79 branches off from the fifth power supply line 75 on the work lighting device 5 side of the connection point with the seventh power supply line 77 and the connection point with the eighth power supply line 78. The tip of the ninth power supply line 79 is connected to the changeover relay 22.

[0032] The sixth power supply line 76 and the ninth power supply line 79 are connected to the input side of the switching relay 22, and a tenth power supply line 80 is connected to the output side of the switching relay 22. The second mounted electrical equipment 43 is connected to the tip of the tenth power supply line 80. When the switching relay 22 is OFF, the sixth power supply line 76 and the tenth power supply line 80 are connected, while the ninth power supply line 79 and the tenth power supply line 80 are disconnected. When the switching relay 22 is ON, the sixth power supply line 76 and the tenth power supply line 80 are disconnected, while the ninth power supply line 79 and the tenth power supply line 80 are connected.

[0033] A supply monitoring current sensor 25 and a DC-AC converter 35 are interposed in the tenth power supply line 80 between the switching relay 22 and the second mounted electrical equipment 43, in that order from the switching relay 22 side. The second mounted electrical equipment 43 is an equipment that operates on power from the auxiliary equipment battery 18 or the mounted-object battery 19, which has been converted from direct current to alternating current of 100V AC by the DC-AC converter 35. The second mounted electrical equipment 43 includes, for example, the above-mentioned air conditioner 7. The switching relay 22 can switch between power supply from the auxiliary equipment battery 18 to the second mounted electrical equipment 43 or power supply from the mounted-object battery 19 to the second mounted electrical equipment 43.

[0034] As described above, the disaster prevention vehicle 1 of this embodiment is provided with three such batteries to adjust the voltage difference between the auxiliary battery 18 and the dedicated battery 19 for mounted equipment, which have different output voltages, and the work lighting device 5, which has an input voltage different from these output voltages.

[0035] FIG. 3 is a control block diagram of the disaster prevention vehicle 1 according to this embodiment. In FIGS. 2 and 3, the disaster prevention vehicle 1 according to this embodiment includes an attachment control unit 50 that controls the power supply from the attachment-specific battery 19 to the work lighting device 5 and the second mounted electrical equipment 43. The attachment control unit 50 monitors the current supply value to the second mounted electrical equipment 43, and when the current supply value exceeds a predetermined supply threshold, stops the power supply from the attachment-specific battery 19 to the second mounted electrical equipment 43 and prioritizes power supply to the work lighting device 5. Therefore, information from various sensors is input to the attachment control unit 50. Specifically, the attachment control unit 50 is electrically connected to the input monitoring current sensor 23, the output monitoring current sensor 24, the supply monitoring current sensor 25, and the hydraulic sensor 26. The attachment control unit 50 is also electrically connected to the battery control unit 27, the attachment main switch 28, and the ignition switch 29, and receives information from them. The hydraulic sensor 26 is a sensor provided to detect that the hydraulic working device 60 is in operation.

[0036] The mounted object control unit 50 makes a decision about the power supply based on the input information. The mounted object control unit 50 has a battery remaining amount acquisition unit 51, an engine rotation setting unit 52, and a hydraulic operation determination unit 53. The battery remaining amount acquisition unit 51 acquires the current remaining battery amount of the mounted object dedicated battery 19 based on information from the battery control unit 27. Furthermore, the hydraulic operation determination unit 53 determines whether the hydraulic working device 60 is operating based on information from the hydraulic pressure sensor 26. Furthermore, the engine rotation setting unit 52 sets an appropriate engine rotation speed of the traveling engine 9 based on information input from various sensors.

[0037] The mounted object control unit 50 is configured to make a determination regarding the power supply and then control each unit based on that determination. Specifically, the mounted object control unit 50 is electrically connected to the energization relay 21, the switching relay 22, the engine ECU 45 as an engine control unit, the work lighting device 5, and the third DC-DC converter 34, and is configured to control them. The mounted object control unit 50 is configured to cut off the power supply from the alternator 15 to the mounted object-dedicated battery 19 using the energization relay 21 until a predetermined delay time has elapsed since the start of the alternator 15. Furthermore, the mounted object control unit 50 is configured to activate the switching relay 22 to switch the power supply from the auxiliary battery 18 to the second mounted object electrical device 43 when the supply current value of the mounted object-dedicated battery 19 becomes equal to or greater than a supply threshold. The mounted object control unit 50 is configured to increase the engine rotation speed of the traveling engine 9 via the engine ECU 45 in response to a decrease in the remaining battery capacity of the mounted object dedicated battery 19 acquired by the battery remaining capacity acquisition unit 51. The mounted object control unit 50 is configured to decrease the engine rotation speed of the traveling engine 9 via the engine ECU 45 in response to an increase in the remaining battery capacity of the mounted object dedicated battery 19 acquired by the battery remaining capacity acquisition unit 51.

[0038] FIG. 4 is a schematic diagram showing the configuration for hydraulically driving the hydraulic working device 60 of the disaster prevention vehicle 1 according to this embodiment. In FIG. 4, the hydraulic pump 17 is driven by power extracted from the traveling engine 9 by the power takeoff device 12. The hydraulic working device 60 is driven by the power of the hydraulic pump 17. The hydraulic working device 60 includes a hydraulic oil tank 61, a hydraulic actuator 62, and a control valve 63 that controls the operation of the hydraulic actuator 62. The hydraulic pump 17, the control valve 63, the hydraulic actuator 62, and the hydraulic oil tank 61 are connected by a hydraulic line to form a hydraulic oil circulation path. In this embodiment, a hydraulic sensor 26 is disposed on the hydraulic line connecting the hydraulic pump 17 and the control valve 63. The mounted object control unit 50 is configured not to increase the engine speed of the traveling engine 9 in response to a decrease in the remaining battery charge when it determines, based on a signal from the hydraulic sensor 26, that the hydraulic working device 60 is operating.

[0039] Next, for the disaster prevention vehicle 1 configured as described above, control of power supply to the work lighting device 5 and the second mounted electrical equipment 43 will be described. Fig. 5 is a flow diagram for explaining charging and power supply control of the disaster prevention vehicle 1 according to this embodiment.

[0040] 3 and 5, in the disaster prevention vehicle 1 parked at the scene, the disaster prevention team member turns on the body main switch 28 (step S01). Then, the disaster prevention team member starts the traveling engine 9 using the ignition switch 29 (step S02). When the traveling engine 9 starts, the alternator 15 also starts.

[0041] Next, in step S03, the mounted object control unit 50 keeps the energizing relay 21 in the OFF state until a predetermined delay time (about several seconds) has elapsed based on the input of a signal indicating that the mounted object main switch 28 has been turned ON and the ignition switch 29 has been turned ON. This prevents power from the alternator 15 from being supplied to the mounted object dedicated battery 19 when the alternator 15 is started, when the power supply becomes unstable. After the delay time has elapsed, the mounted object control unit 50 turns the energizing relay 21 ON to allow power supply from the alternator 15 to the mounted object dedicated battery 19.

[0042] In step S04, the mounted object control unit 50 determines whether the input is equal to or greater than the output, based on the balance between the current input and output of the auxiliary battery 18. At this time, the mounted object control unit 50 determines the input based on information from the input monitoring current sensor 23. Also, the mounted object control unit 50 determines the output based on information from the output monitoring current sensor 24. If the mounted object control unit 50 determines that the input is equal to or greater than the output, the process proceeds to step S05. On the other hand, if the mounted object control unit 50 determines that the input is less than the output, the process proceeds to step S07.

[0043] In step S05, the mounted object control unit 50 turns off the output of the third DC-DC converter 34. This cuts off the power supply from the mounted object-dedicated battery 19 to the work lighting device 5. Meanwhile, power is supplied to the work lighting device 5 only from the auxiliary battery 18 via the first power supply line 71, the third power supply line 73, the fifth power supply line 75, and the seventh power supply line 77 shown in FIG. 2 . The power from the auxiliary battery 18 is voltage-adjusted by the first DC-DC converter 32 and the second DC-DC converter 33 and supplied to the work lighting device 5. In step S05, since the input of the auxiliary battery 18 is greater than the output of the auxiliary battery 18, the auxiliary battery 18 is constantly being charged to increase its remaining battery capacity. At this time, the switching relay 22 is in the ON state, and power is also supplied to the second mounted electrical equipment 43 via the third power supply line 73, the fifth power supply line 75, and the sixth power supply line 76. In this state, the power supply to the second mounted electrical equipment 43 and the work lighting device 5 is fully provided by the auxiliary battery 18. In addition, at this time, the power from the alternator 15 is supplied to the mounted-object dedicated battery 19 through the first power supply line 71, the third power supply line 73, and the fourth power supply line 74, so that the mounted-object dedicated battery 19 is charged.

[0044] In step S07, the mounted object control unit 50 turns on the output of the third DC-DC converter 34. This causes power to be supplied from the mounted object-dedicated battery 19 to the work lighting device 5 through the eighth power supply line 78 and the fifth power supply line 75. In step S07, the output of the auxiliary battery 18 is greater than the input, so the auxiliary battery 18 is constantly charging, but its remaining battery charge is decreasing. Therefore, by supplying power from the mounted object-dedicated battery 19 to the work lighting device 5, the load on the auxiliary battery 18 is reduced. This reduces the output current from the auxiliary battery 18, and the balance between the input and output of the auxiliary battery 18 can be adjusted to an appropriate relationship.

[0045] Next, in step S08, the mounted object control unit 50 monitors the supply current to the second mounted electrical device 43 using the supply monitoring current sensor 25, and determines whether the supply current value is smaller than a supply threshold value. The supply threshold value is, for example, 70 A. If the supply current value is less than the supply threshold value, the process proceeds to step S09, and if the supply current value is equal to or greater than the supply threshold value, the process proceeds to step S10.

[0046] In step S09, the mounted object control unit 50 turns on the switching relay 22. As a result, the sixth power supply line 76 and the tenth power supply line 80 are disconnected, while the ninth power supply line 79 and the tenth power supply line 80 are connected. Power from the auxiliary equipment battery 18 is supplied to the second mounted electrical equipment 43 through the first power supply line 71, the third power supply line 73, the fifth power supply line 75, the ninth power supply line 79, and the tenth power supply line 80. Power from the mounted object dedicated battery 19 is supplied to the second mounted electrical equipment 43 through the eighth power supply line 78, the ninth power supply line 79, and the tenth power supply line 80. Power from the auxiliary equipment battery 18 is supplied to the work lighting device 5 through the first power supply line 71, the third power supply line 73, and the fifth power supply line 75. Furthermore, power from the battery 19 dedicated to the mounted object is supplied to the work lighting device 5 through the eighth power supply line 78 and the fifth power supply line 75. That is, in step S09, power is supplied from both the auxiliary battery 18 and the battery 19 dedicated to the mounted object to the second mounted electrical device 43 and the work lighting device 5. When the switching relay 22 is turned ON by the mounted object control unit 50, the process proceeds to step S11.

[0047] In step S10, the mounted object control unit 50 turns off the switching relay 22. As a result, the sixth power supply line 76 and the tenth power supply line 80 are connected, while the ninth power supply line 79 and the tenth power supply line 80 are disconnected. Step S10 occurs when the power consumption of the second mounted electrical equipment 43 increases. In this case, power is supplied from the mounted object dedicated battery 19 only to the work lighting device 5, which is important for ensuring the visibility of active personnel. On the other hand, power is supplied to the second mounted electrical equipment 43 only from the auxiliary equipment battery 18. Specifically, power from the auxiliary equipment battery 18 is supplied to the second mounted electrical equipment 43 through the first power supply line 71, the third power supply line 73, the fifth power supply line 75, the sixth power supply line 76, and the tenth power supply line 80. Furthermore, power from the battery 19 dedicated to the mounted object is supplied to the work lighting device 5 through the eighth power supply line 78 and the fifth power supply line 75. When the switching relay 22 is turned OFF by the mounted object control unit 50, the process proceeds to step S11.

[0048] In step S11, the equipment control unit 50 determines whether the remaining battery charge is 30% or more based on the remaining battery charge of the equipment-dedicated battery 19 acquired by the remaining battery charge acquisition unit 51. This value of 30% is just one example and can be changed. If the remaining battery charge is 30% or more, the process returns to step S07, and if the remaining battery charge is less than 30%, the process proceeds to step S12.

[0049] In step S12, the mounted object control unit 50 uses the hydraulic operation determination unit 53 to determine whether the hydraulic working device 60 is operating based on the signal from the hydraulic sensor 26. If it is determined that the hydraulic working device 60 is operating (YES in S12), the mounted object control unit 50 waits until the hydraulic working device 60 stops operating. On the other hand, if it is determined that the hydraulic working device 60 has stopped operating, the process proceeds to step S13.

[0050] In step S13, the mounted object control unit 50 sends an engine rotation speed increase signal to the engine ECU 45 via the engine rotation speed setting unit 52 to increase the engine rotation speed. For example, the engine rotation speed is increased from idling to 1200 rpm. Increasing the engine rotation speed increases the amount of power generated per unit time by the alternator 15. That is, according to steps S11 to S13, the mounted object control unit 50 controls the engine rotation speed of the traveling engine 9 to increase via the engine ECU 45 in response to a decrease in the remaining battery charge of the mounted object-dedicated battery 19 acquired by the remaining battery charge acquisition unit 51. Furthermore, when the mounted object control unit 50 determines that the hydraulic working device 60 is operating based on a signal from the hydraulic sensor 26, it does not control the engine rotation speed of the traveling engine 9 to increase in response to a decrease in the remaining battery charge of the mounted object-dedicated battery 19.

[0051] Next, in step S14, the mounted object control unit 50 turns off the third DC-DC converter 34. This cuts off the power supply from the mounted object dedicated battery 19 to the work lighting device 5. Meanwhile, power is supplied to the work lighting device 5 only from the auxiliary equipment battery 18 through the first power supply line 71, the third power supply line 73, the fifth power supply line 75, and the seventh power supply line 77. The power from the auxiliary equipment battery 18 is voltage-adjusted by the first DC-DC converter 32 and the second DC-DC converter 33 and then supplied to the work lighting device 5. In step S14, since the remaining battery charge of the mounted object dedicated battery 19 has become low, power supply from the mounted object dedicated battery 19 is stopped and charging of the mounted object dedicated battery 19 is prioritized. Since the amount of power generated per unit time by the alternator 15 has increased by step S13, the mounted object dedicated battery 19 is charged in a short time.

[0052] Next, in step S15, the equipment control unit 50 determines whether the remaining battery charge is 80% or more based on the remaining battery charge of the equipment-dedicated battery 19 acquired by the remaining battery charge acquisition unit 51. This value of 80% is just one example and can be changed. If it is determined that the remaining battery charge is less than 80%, the process returns to step S13, and if it is determined that the remaining battery charge is 80% or more, the process proceeds to step S16.

[0053] In step S16, since the remaining battery charge of the dedicated battery 19 for the mounted object has reached a sufficient level, the mounted object control unit 50 sends an engine speed reduction signal to the engine ECU 45 via the engine speed setting unit 52 to reduce the engine speed. For example, the engine speed is reduced from 1200 rpm to an idling state. This causes the amount of power generated per unit time by the alternator 15, which had temporarily increased, to return to normal. Since constantly increasing the engine speed would increase noise and reduce the fuel efficiency of the driving engine 9, the engine speed is increased only when it is desired to charge the dedicated battery 19 for the mounted object in a short period of time. Once the mounted object control unit 50 has reduced the engine speed of the dedicated battery 19 for the mounted object, the process returns to step S04.

[0054] In step S04, regarding the balance between the current input and output of the auxiliary battery 18, if it is determined that the input is greater than or equal to the output, and if the output of the third DC-DC converter 34 is turned OFF in step S05, the process proceeds to step S06. In step S06, the mounted object control unit 50 determines whether the power supply to the work lighting device 5 is OFF and the power supply to the second mounted electrical equipment 43 is OFF. The power switch for the work lighting device 5 and the power switch for the second mounted electrical equipment 43 may be integrated into the mounted main switch 28 or may be provided separately from the mounted main switch 28. If the mounted object control unit 50 determines that at least one of the power supply to the work lighting device 5 and the power supply to the second mounted electrical equipment 43 is ON, the process returns to step S04. On the other hand, if the mounted object control unit 50 determines that the power supply to the work lighting device 5 is OFF and the power supply to the second mounted electrical equipment 43 is OFF, the control of the power supply ends.

[0055] As described above, the disaster prevention vehicle 1 of this embodiment is equipped with a running engine 9, a chassis-mounted alternator 15 driven by the power of the running engine 9, a battery 19 dedicated to the mounted object that is charged by the alternator 15 or an external power source, a work lighting device 5 that operates using power from the battery 19 dedicated to the mounted object, a second mounted electrical equipment 43 that operates using power from the battery 19 dedicated to the mounted object, and a mounted object control unit 50 that controls the power supply from the battery 19 dedicated to the mounted object to the work lighting device 5 and the second mounted electrical equipment 43, and the mounted object control unit 50 is configured to monitor the supply current value to the second mounted electrical equipment 43, and when the supply current value becomes equal to or greater than a predetermined supply threshold, stop the power supply from the battery 19 dedicated to the mounted object to the second mounted electrical equipment 43 and supply power preferentially to the work lighting device 5.

[0056] According to the above configuration, the work lighting device 5 and the second mounted electrical equipment 43 can be operated using power from the newly installed dedicated battery 19 for the mounted equipment, rather than from the auxiliary battery 18 provided by the chassis manufacturer. This eliminates the risk of the auxiliary battery 18 being unable to supply power to the driving-related equipment due to insufficient battery charge, and allows for a stable power supply to the work lighting device 5 and the second mounted electrical equipment 43. Furthermore, when the current supply value to the second mounted electrical equipment 43 exceeds a predetermined supply threshold, the mounted equipment control unit 50 stops the power supply from the dedicated battery 19 for the mounted equipment to the second mounted electrical equipment 43 and prioritizes power supply to the work lighting device 5. This reliably prevents the work lighting device 5, which is important for ensuring the visibility of active personnel, from being turned off due to a power shortage during operation. This allows for the disaster prevention vehicle 1 to be capable of appropriate power supply.

[0057] In this embodiment, a lithium-ion battery is used for the mounted-item battery 19. A lithium-ion battery is lighter, more compact, and has a larger capacity than the lead battery used for the auxiliary equipment battery 18. Therefore, the installation space for the mounted-item battery 19 can be reduced to ensure the space and load weight for storing the loaded equipment and materials, while also being able to handle cases where the power consumption of the mounted electrical equipment as a whole is large.

[0058] In this embodiment, the alternator 15 and the attached-object battery 19 are connected by a first power supply line 71, a third power supply line 73, and a fourth power supply line 74, and a relay 21 is provided in the third power supply line 73, and the attached-object control unit 50 is configured to cut off the power supply from the alternator 15 to the attached-object battery 19 by the relay 21 until a predetermined delay time has elapsed since the start of the alternator 15. According to this configuration, when the alternator 15 is started, when the power supply becomes unstable, power from the alternator 15 is not supplied to the attached-object battery 19, so that the attached-object battery 19 can be prevented from breaking down due to an input of an abnormal voltage or current. can.

[0059] This embodiment also includes an auxiliary battery 18 charged by the alternator 15, and a switching relay 22 that switches between supplying power from the auxiliary battery 18 to the second mounted electrical device 43 and supplying power from the dedicated battery 19 for the mounted object to the second mounted electrical device 43. The mounted object control unit 50 is configured to operate the switching relay 22 to switch the power supply from the auxiliary battery 18 to the second mounted electrical device 43 when the current value supplied to the second mounted electrical device 43 exceeds a supply threshold. With this configuration, when the current value supplied to the second mounted electrical device 43 exceeds a predetermined supply threshold, the power supply from the dedicated battery 19 for the mounted object to the second mounted electrical device 43 is stopped, but the second mounted electrical device 43 is supplied with power from the auxiliary battery 18. This allows power to be supplied to both the work lighting device 5 and the second mounted electrical device 43 using two types of batteries, the dedicated battery 19 for the mounted object and the auxiliary battery 18. In addition, the work lighting device 5, which is important for ensuring visibility for active personnel, is supplied with power from the dedicated battery 19 for the equipment, which has a larger capacity than the auxiliary battery 18. This allows for more appropriate power supply.

[0060] In this embodiment, the mounted object control unit 50 has a battery remaining capacity acquisition unit 51 that acquires the remaining battery capacity of the mounted object dedicated battery 19, and is connected to the engine ECU 45 of the traveling engine 9, and is configured to increase the rotation speed of the traveling engine 9 via the engine ECU 45 in response to a decrease in the remaining battery capacity acquired by the battery remaining capacity acquisition unit 51. According to this configuration, when the remaining battery capacity of the mounted object dedicated battery 19 becomes low, the engine rotation speed of the traveling engine 9 is increased to increase the amount of power generated per unit time by the alternator 15, thereby making it possible to restore the remaining battery capacity of the mounted object dedicated battery 19 to a sufficient amount in a short time.

[0061] Furthermore, this embodiment includes a hydraulic pump 17 driven by power extracted from the traveling engine 9, a hydraulic working device 60 driven by power from the hydraulic pump 17, and a hydraulic sensor 26 for detecting that the hydraulic working device 60 is in operation, and the mounted object control unit 50 is configured not to control the increase in engine speed of the traveling engine 9 in response to a decrease in the remaining battery charge of the mounted object battery 19 when it determines that the mounted object control unit 50 is in operation based on a signal from the hydraulic sensor 26. This configuration prevents a sudden increase in engine speed while the hydraulic working device 60 is in operation from changing the hydraulic oil discharge flow rate of the hydraulic pump 17 and causing the operation of the hydraulic working device 60 to become unstable, thereby ensuring safety.

[0062] In this embodiment, the work vehicle is described as a disaster prevention vehicle 1, but the work vehicle may be any vehicle equipped with work lighting devices and other mounted electrical equipment, and is not limited to this embodiment.

[0063] The embodiments disclosed herein are illustrative in all respects and are not intended to be limiting. The technical scope of the present invention is not to be interpreted solely by the above-described embodiments, but is defined by the claims. The technical scope of the present invention also includes all modifications within the scope and meaning equivalent to the claims. [Explanation of symbols]

[0064] 1. Disaster prevention vehicles 5. Work lighting equipment 9. Driving engine 15 Alternator 17 Hydraulic pump 18 Auxiliary battery 19 Battery for bodywork 21 Power relay 22 Switching relay 25 Current sensor for supply monitoring 26 Oil pressure sensor 43 Second body electrical equipment 45 Engine ECU (engine control unit) 50 Mounting equipment control section 60 Hydraulic work equipment 71 First Power Supply Line 73 Third Power Supply Line 74 4th Power Supply Line

Claims

1. The vehicle is equipped with a running engine, an alternator attached to the chassis driven by the power of the running engine, a battery dedicated to the mounted object that is charged by the alternator or an external power source, a work lighting device that operates on the power of the battery dedicated to the mounted object, mounted electrical equipment that operates on the power of the battery dedicated to the mounted object, and a mounted object control unit that controls the supply of power from the battery dedicated to the mounted object to the work lighting device and the mounted electrical equipment. The mounted object control unit is configured to monitor a supply current value to the mounted electrical equipment, and when the supply current value becomes equal to or greater than a predetermined supply threshold, stop the power supply from the mounted object dedicated battery to the mounted electrical equipment and supply power preferentially to the work lighting device, The alternator and the dedicated battery for the mounted vehicle are connected by a power supply line, a power relay is provided in the power supply line; The vehicle is characterized in that the equipment control unit is configured to cut off the power supply from the alternator to the equipment-dedicated battery by the energizing relay until a predetermined delay time is reached after the alternator is started.

2. 2. The work vehicle according to claim 1, wherein the battery dedicated to the mounted equipment is a lithium ion battery.

3. The system is provided with an auxiliary battery charged by the alternator, and a switching relay for switching between power supply from the auxiliary battery to the mounted electrical equipment or power supply from the mounted-object dedicated battery to the mounted electrical equipment, The work vehicle according to claim 1 or 2, characterized in that the mounted equipment control unit is configured to activate the switching relay to switch the power supply from the auxiliary battery to the mounted electrical equipment when the supply current value becomes equal to or greater than the supply threshold value.

4. The mounted object control unit has a battery remaining amount acquisition unit that acquires the remaining amount of the mounted object dedicated battery, and is connected to an engine control unit of the traveling engine, 4. The work vehicle according to claim 1, wherein the engine speed of the driving engine is controlled to increase via the engine control unit in response to a decrease in the remaining battery charge acquired by the remaining battery charge acquisition unit.

5. a hydraulic pump driven by power extracted from the traveling engine, a hydraulic working device driven by power of the hydraulic pump, and a hydraulic sensor for detecting that the hydraulic working device is in operation, The work vehicle according to claim 4, characterized in that the mounted object control unit is configured not to perform control to increase the engine speed of the driving engine in response to a decrease in the remaining battery charge when it determines that the hydraulic working device is operating based on a signal from the hydraulic sensor.

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