Mobile power supply vehicle

Abstract

The present disclosure provides a mobile power supply vehicle capable of generating AC power having a substantially constant voltage by driving an AC generator by means of a diesel engine. The present disclosure relates to a mobile power supply vehicle comprising: a vehicle capable of traveling; a diesel engine, and a choke controller connected to the engine; a PTO connected to the engine; an AC generator; a pulley connecting the PTO and the AC generator; an AVR connected to the AC generator and the engine; and a power generation control circuit connected to the AC generator. The engine is for travel and for power generation by means of the AC generator. The power generation control circuit can supply AC power generated by the AC generator, by means of the engine, to a power reception-side device. The rotational speed of the AC generator can be changed such that the voltage and frequency thereof approach those set by the AVR in accordance with load fluctuations. The choke controller increases or decreases the engine rotational speed in accordance with a command from the AVR for maintaining the specified rotational speed of the AC generator.

Description

mobile power vehicle

[0001] The present invention relates to a mobile power supply vehicle.

[0002] A mobile power supply vehicle has power supply equipment such as a power generation device and a power storage device, and is configured to be able to use this power supply equipment to charge an external power storage device or supply power to external electrical equipment, etc. (Patent Document 1).

[0003] Mobile power supply vehicles are also expected to serve as an emergency power supply source at disaster sites. At disaster sites (disaster-stricken areas) where the power supply grid has been damaged, there are diverse power supply needs for various electrical devices, and mobile power supply vehicles that can support these diverse needs as a power supply source are being considered.

[0004] A mobile power supply vehicle has been proposed that is equipped with a diesel engine for propulsion and DC power generation and an LPG engine for power generation, and that generates DC power by driving the diesel engine and AC power by driving the LPG engine (Patent Document 2).

[0005] JP 2013-027194 A JP 2023-083185 A

[0006] However, in prior art such as Patent Document 2, the rotational speed of a diesel engine for traveling is unstable. Therefore, when attempting to generate AC power by driving a generator using the diesel engine, the generator's rotational speed becomes unstable, making it impossible to maintain a constant AC voltage. Therefore, DC power is generated and AC is then generated via a DC / AC inverter. Furthermore, in order to directly generate AC power, a separate power source such as an LPG engine is required. Generating DC and then converting it to AC requires a separate DC / AC inverter, which requires additional installation space and costs, and also generates losses associated with the conversion from DC to AC. Furthermore, requiring a separate power source such as an LPG engine requires fuel for the power source, which requires additional installation space and costs.

[0007] The present invention has been made in view of the above circumstances, and has as its object to provide a mobile power supply vehicle that is capable of generating AC power of a substantially constant voltage by driving an AC generator using a diesel engine for running the vehicle.

[0008] The gist of the present invention is as follows: (1) A mobile power supply vehicle comprising: a vehicle capable of traveling; a diesel engine provided on the vehicle and a choke controller connected to the diesel engine; a PTO connected to the diesel engine; an AC generator; a first pulley connected to the PTO; a second pulley connected to the AC generator and connected to the first pulley via a belt; an automatic voltage regulator connected to the AC generator and the diesel engine; and a power generation control circuit connected to the AC generator, wherein the diesel engine is for propulsion of the vehicle and for power generation by the AC generator, the power generation control circuit is configured to be able to supply AC power generated by the AC generator when driven by the diesel engine to a power receiving device, the AC generator is configured to be able to change its rotation speed so as to approach the voltage and frequency set by the automatic voltage regulator in response to load fluctuations on the power receiving device, and the choke controller increases or decreases the engine rotation speed of the diesel engine in response to a command from the automatic voltage regulator to maintain the rotation speed of the AC generator at a specified rotation speed. (2) The mobile power supply vehicle described in (1) above, wherein the first pulley, the second pulley, or both are configured to be replaceable with ones that are compatible in terms of shaft diameter, number of belts, or both, in accordance with the output of the diesel engine and the power generation capacity of the AC generator. (3) The mobile power supply vehicle described in (1) or (2) above, wherein the power generation control circuit is configured to be capable of outputting a single-phase three-wire system, a three-phase three-wire system, or a combination thereof. (4) The mobile power supply vehicle described in (1) or (2) above, wherein the power generation control circuit is configured to be capable of outputting 100V / 200V in a single-phase three-wire system and 200V in a three-phase three-wire system, 100V / 200V in a single-phase three-wire system and 200V / 400V in a three-phase three-wire system, or 200V / 400V in a three-phase three-wire system. (5) The mobile power supply vehicle according to any one of (1) to (4) above, further comprising a storage battery, the storage battery being configured to be able to store DC power obtained from an external power source and to be able to supply AC power to the power receiving device.

[0009] According to the present invention, it is possible to provide a mobile power supply vehicle that can generate AC power of a substantially constant voltage by driving an AC generator using a diesel engine for traveling.

[0010] FIG. 1 is a schematic diagram of an example of a mobile power supply vehicle 100 including a diesel engine 10, a PTO 20, a first pulley 31, a second pulley 32, a belt 40, and an AC generator 50 mounted on a vehicle 1. FIG. 2 is a schematic diagram of the A-A' cross section of FIG. 1, viewed downward from the plane of the paper. FIG. 3 is a block diagram showing the configuration related to the power supply of this mobile power supply vehicle. FIG. 4 is an example of a power receiving device for AC power supplied by this mobile power supply vehicle. FIG. 5 is a block diagram showing the configuration of a power storage device including a storage battery that can be provided in this mobile power supply vehicle. FIG. 6 is a photograph of an example of a state in which six belts are looped around the second pulley connected to the AC generator. FIG. 7 is a photograph of the graph display screen of an oscilloscope measuring electricity when this mobile power supply vehicle outputs a specified voltage of 400V in a three-phase, three-wire system. FIG. 8 shows the measurement results of the graph of FIG. 7. FIG. 9 is a graph showing the results of a load endurance test of the AC generator included in this mobile power supply vehicle, conducted using a load tester (LE-330).

[0011] The present disclosure relates to a mobile power supply vehicle comprising: a vehicle capable of traveling; a diesel engine provided on the vehicle; and a choke controller connected to the diesel engine; a PTO connected to the diesel engine; an AC generator; a first pulley connected to the PTO; a second pulley connected to the AC generator and connected to the first pulley via a belt; an automatic voltage regulator connected to the AC generator and the diesel engine; and a power generation control circuit connected to the AC generator; the diesel engine is for propulsion of the vehicle and for power generation by the AC generator; the power generation control circuit is configured to be able to supply AC power generated by the AC generator as a result of driving the diesel engine to a power receiving device; the AC generator is configured to be able to change its rotation speed so as to approach the voltage and frequency set by the automatic voltage regulator in accordance with load fluctuations on the power receiving device; and the choke controller increases or decreases the engine rotation speed of the diesel engine in accordance with a command from the automatic voltage regulator to maintain the rotation speed of the AC generator at a specified rotation speed.

[0012] In the mobile power supply vehicle (hereinafter also referred to as the present mobile power supply vehicle) of the present disclosure, the AC generator is configured to be able to generate AC power by obtaining rotational energy from the drive energy of a diesel engine mounted on the vehicle. Specifically, the AC generator obtains rotational energy from the drive energy of the diesel engine mounted on the vehicle via a PTO (power take-off) and a pulley to generate AC power, and the generated AC power can be supplied to a power receiving device (secondary side) via a power generation control circuit.

[0013] This mobile power supply vehicle uses the same diesel engine that is used for propulsion as for power generation, and is able to generate AC power at a substantially constant voltage by driving an AC generator using the diesel engine. This mobile power supply vehicle can directly utilize the AC power generated by the generator, and is therefore highly effective as an emergency power supply source in a variety of situations, such as at disaster sites where the power supply grid has been damaged. In this way, this mobile power supply vehicle can supply the AC power generated by driving the AC generator using the diesel engine that is also used for propulsion to the secondary side, so no additional installation space for a power source for power generation is required, it is low cost, and because it does not require DC to AC conversion, there is no loss when converting from DC to AC.

[0014] A block diagram showing the configuration related to the power supply of this mobile power supply vehicle is shown in Figure 3. This mobile power supply vehicle is equipped with a diesel engine mounted on the vehicle and a choke controller connected to the diesel engine, a PTO connected to the diesel engine, an AC generator, a first pulley connected to the PTO, a second pulley connected to the AC generator and connected to the first pulley via a belt, an automatic voltage regulator (AVR) connected to the AC generator and the diesel engine, and a power generation control circuit connected to the AC generator.

[0015] The mobile power generation vehicle may have a voltage and current control panel. The voltage and current control panel may include an AVR, a power generation control circuit, a step-down transformer, and a multimeter. The AVR, power generation control circuit, step-down transformer, and multimeter may be connected within the voltage and current control panel. The AC generator may be connected to the voltage and current control panel. The power generation control circuit may include a multimeter. Using the multimeter, information on voltage (V), current (A), frequency (Hz), electrical capacity (kWH), and operating time (h) from power generation to discharge can be obtained. The power generation control circuit may include a step-down transformer. A step-down transformer can be used when different voltages are used, such as when a 400V generator is partially used at 200V.

[0016] The diesel engine is used to drive the vehicle and to generate electricity using an AC generator, which is configured to generate AC power by being driven by the diesel engine, and the power generation control circuit is configured to supply the AC power generated by the AC generator to a power receiving device. In response to the load of the power receiving device, the choke controller increases or decreases the engine speed of the diesel engine based on a command from the AVR to maintain the AC generator at a specified speed, so that the AVR maintains the specified speed of the AC generator so as to maintain a set voltage for the AC generator. The choke controller can maintain the diesel engine speed at or near a desired speed.

[0017] When the load of the power receiving device (secondary side) changes, the AC generator's output voltage may change. However, the AVR attempts to maintain the AC generator's output voltage constant by maintaining the AC generator's rotational speed at a specified speed. If the diesel engine speed exceeds or is insufficient relative to the AVR's request to maintain the AC generator's rotational speed at the specified speed, the engine control device installed in the vehicle detects this condition and transmits a signal to the choke controller to adjust the diesel engine's rotational speed. The AVR's request to maintain the AC generator's rotational speed at the specified speed may be information on whether the AC generator's rotational speed is insufficient or excessive relative to the specified speed, information on the diesel engine's rotational speed required to rotate the AC generator at the specified speed, or both. This adjusts the diesel engine's rotational speed, thereby maintaining the AC generator's rotational speed at the specified speed. The engine control device can set the vehicle's automatic engine output to the specified AC generator rotational speed, for example, 1500 rpm, and issue a command to the choke controller to adjust the engine speed.

[0018] The engine control device may include a processing device, a storage device capable of reading and writing data, and a communication device that exchanges data with the choke controller, diesel engine, PTO, and AVR. The processing device has one or more processors and their peripheral circuits. The processing device controls the overall operation of the engine control device and is, for example, a central processing unit (CPU). Communication by the communication device can be performed between ECUs (Electronic Control Units) that may be included in the engine control device, AVR, choke controller, diesel engine, and PTO using CAN communication, a serial communication protocol.

[0019] The storage device stores programs such as a driver program, an operating system program, and application programs. The storage device may also store programs for transmitting and receiving signals to and from the AVR, the choke controller, the diesel engine, and the PTO. The storage device may also include a program for switching the choke controller ON and OFF in response to a command from the AVR to maintain the generator speed. When the choke controller is turned ON, it can increase or decrease the diesel engine speed so as to maintain the alternator speed at a specified speed. The choke controller can increase or decrease the diesel engine speed so that the alternator speed is preferably within ±7%, more preferably within 5%, even more preferably within ±3%, even more preferably within ±1%, and even more preferably substantially at the specified speed.

[0020] The processing device can execute various processes based on programs (driver programs, operating system programs, application programs, etc.) stored in the storage device. The processing device may also execute multiple programs (application programs, etc.) in parallel.

[0021] An example of a power-receiving device that receives AC power supplied by this mobile power supply vehicle is shown in Figure 4. Examples of power-receiving devices include lighting and power panels in buildings, lighting and power panels at construction sites and events, BCP (Business Continuity Planning) equipment, EV chargers, medical equipment, etc.

[0022] Light oil, which is the fuel for diesel engines, is stored in a fuel tank provided in a vehicle and supplied to the diesel engine.

[0023] The AC generator in this mobile power supply vehicle can be an AC generator with performance selected to suit the power generation requirements of the load of the power-receiving device (secondary side) to which the generated power is supplied, such as the power generation requirements of elevators (registered trademark), lighting fixtures, etc., and can be a 200V type generator or a 400V type generator. For example, the AC generator can be a 200V type generator for supplying power to power facilities in factories, warehouses, construction sites, etc., and a 400V type generator for supplying power to elevators (registered trademark), etc. The AC generator in this mobile power supply vehicle can also be an AC generator with an output that corresponds to the load.

[0024] The AC generator can be a commercially available generator used for AC power generation or an AC generator obtained by improving a commercially available generator. The AC generator is preferably a brushless AC generator. For example, the AC generator is a brushless AC generator (synchronous generator, LX-E 46B2, 160 / 190 kVA) manufactured by Taiyo Electric Co., Ltd., and is capable of generating single-phase 100V / 200V and three-phase 200V / 400V.

[0025] By driving an AC generator at its specified rotational speed, it is possible to generate rated power. For example, in the case of a brushless AC generator (synchronous generator, LX-E 46B2) manufactured by Taiyo Electric Co., Ltd., by maintaining a rotational speed of 1500 rpm, it is possible to generate an AC current of 415 V, 223 A at 50 Hz, and by maintaining a rotational speed of 1800 rpm, it is possible to generate an AC current of 415 V, 264 A at 60 Hz.

[0026] The diesel engine is connected to the PTO, and the alternator is connected to the PTO via pulleys, including a first pulley connected to the PTO and a second pulley connected to the alternator, the first pulley and the second pulley being connected by a belt for transmitting power between the pulleys.

[0027] The AVR is connected to an AC generator. The AVR and AC generator may be connected as separate units, or the AVR may be built into the AC generator and connected to it. The AVR has an adjustment mechanism that can adjust the voltage of the power generated by the AC generator to a desired voltage. The AVR also has an adjustment mechanism that can adjust the frequency of the power generated by the AC generator to a desired frequency, for example, 50 Hz or 60 Hz.

[0028] The AVR may be a conventional one, and is an AVR of a sine wave inverter type that can increase and decrease the output voltage of the AC generator.

[0029] The AVR monitors the rotational speed of the AC generator to maintain the specified rotational speed so as to maintain the frequency and voltage set by the AVR when the load on the power receiving device fluctuates. To maintain the rotational speed of the AC generator at the specified rotational speed, the choke controller adjusts the engine output (rotational speed) of the diesel engine based on a maintenance command from the AVR.

[0030] The rotation speed of a diesel engine is unstable, but by combining it with a choke controller, the engine rotation speed can be adjusted in accordance with the increase or decrease in the rotation speed of the alternator.

[0031] In this mobile power supply vehicle, the PTO is connected to the vehicle's engine control device, and can control the diesel engine speed when the PTO is operating. When the diesel engine is switched from driving to driving the AC generator using the PTO, the choke controller rotates the diesel engine at a preset speed. Switching from driving to driving the AC generator using the PTO can be done electronically with the vehicle's selector switch while the gear is in neutral.

[0032] The diesel engine may be rotated at a higher rotational speed than the specified rotational speed of the alternator, taking losses into consideration. The diesel engine is rotated at a rotational speed that is preferably 50 to 150 rpm higher, more preferably 70 to 130 rpm higher, and even more preferably 90 to 110 rpm higher than the specified rotational speed of the alternator. For example, when an alternator having a specified rotational speed of 1500 rpm is used, the diesel engine can be rotated at 1600 rpm, taking losses into consideration, to rotate the alternator at 1500 rpm, thereby generating rated AC power.

[0033] Information transmitted from the PTO to the engine control unit may include environmental information such as PTO temperature. The PTO may have a protection circuit. For example, when the PTO temperature reaches a predetermined temperature, the PTO can be placed in neutral to protect the equipment. Furthermore, for example, when the PTO's rotation speed drops below or exceeds a predetermined value, the PTO can be placed in neutral to protect the equipment. In this way, the secondary side can be protected even if a voltage change (low voltage, high voltage) occurs on the secondary side. Communication between the PTO and the engine control unit can be performed via a wired connection, and can be transmitted using a voltage output between 0V and 12V DC. The content of the communication can be changed depending on the voltage value; for example, 0V indicates neutral, 1V indicates an increase in rotation speed, 2V indicates a decrease in rotation speed, and 3V indicates an abnormal PTO temperature.

[0034] The mobile power supply vehicle may be equipped with a PTO cooling radiator. The cooling radiator is driven by the diesel engine. By providing the cooling radiator, it is possible to suppress temperature increases in the PTO, allowing the mobile power supply vehicle to provide a more stable power supply.

[0035] The rotation speed and output voltage of an AC generator tend to fluctuate depending on the load on the power receiving device. For example, when operating a large machine such as an elevator, the rotation speed of the AC generator tends to decrease and fall below a specified speed, e.g., 1500 rpm. When the rotation speed falls below the specified speed, the frequency and output voltage also fluctuate. Therefore, a request to maintain the rotation speed of the AC generator at the specified speed is generated to maintain the frequency and output voltage set by the AVR. In response to this request to maintain the rotation speed of the AC generator, the choke controller can increase the engine speed of the diesel engine to increase the rotation speed of the AC generator toward the specified speed. However, because the secondary voltage tends to decrease as the load on the power receiving device increases, it is preferable to operate the AC generator within a range that obtains a rated output voltage, e.g., 400 V or higher, even when the engine speed is increased.

[0036] When the load is light, the rotational speed of the alternator tends to increase and easily exceed a specified rotational speed, for example, 1500 rpm. When the specified rotational speed is exceeded, the frequency and output voltage also fluctuate, so a request is made to maintain the rotational speed of the alternator at the specified rotational speed so as to maintain the frequency and output voltage set by the AVR. In response to this request to maintain the rotational speed of the alternator, the engine speed of the diesel engine is reduced by the choke controller, thereby reducing the rotational speed of the alternator toward the specified rotational speed.

[0037] The PTO may be a conventional PTO, such as a transmission-side PTO, which can operate when the vehicle is stopped. The PTO is disposed between the diesel engine and the alternator and has a predetermined output that can satisfy both the engine output (kW) of the diesel engine and the generator output (kVA) of the alternator, such as a PTO with a maximum output of 40 kW.

[0038] FIG. 1 shows a schematic diagram of an example of a mobile power supply vehicle 100 including a diesel engine 10 mounted on a vehicle 1, a PTO 20, a first pulley 31, a second pulley 32, a belt 40, and an AC generator 50.

[0039] Figure 2 is a schematic diagram of the A-A' cross section of Figure 1, viewed downward from the plane of the paper of Figure 1. In Figure 2, a first pulley 31 connected to a PTO located under the vehicle and a second pulley 32 connected to an AC generator located in the trunk of the vehicle are connected by a belt 40.

[0040] The mobile power supply vehicle 100 can be configured based on a vehicle that can travel using a pair of front wheels 2 and rear wheels 3 disposed at the front and rear of the vehicle 1. The vehicle is preferably a truck. The vehicle 1 is provided with a luggage compartment, and various types of power supply equipment can be stored inside this luggage compartment.

[0041] Preferably, the first pulley, the second pulley, or both of them are configured to be replaceable with ones having shaft diameters, number of belts, or both that are compatible with the output of the diesel engine and the power generation capacity of the alternator.

[0042] The shaft diameters of the first pulley and the second pulley and the number of belts can be adjusted so as to rotate the AC generator at a predetermined rotation speed.

[0043] The preferred shaft diameter of the first pulley can be determined based on the torque (Nml), maximum rotational speed (rpm), and operating angle (deg) of the PTO so that the PTO, located between the diesel engine and the AC generator, can be driven (rotated) with sufficient power to meet both the engine output (kW) of the diesel engine and the generator output (kVA) of the AC generator. The maximum shaft diameter of the first pulley can also be determined depending on the space available in the vehicle frame, for example, 2WD, 4WD, etc. The shaft diameter of the first pulley is preferably 30 to 400 mm, more preferably 40 to 320 mm, and even more preferably 50 to 150 mm. Having the preferred shaft diameter of the first pulley within the above preferred range makes it easier to more stably obtain the desired engine output of the diesel engine and to more stably drive the AC generator at a predetermined rotational speed using the engine output of the diesel engine transmitted via the PTO.

[0044] The shaft diameter of the second pulley is preferably 30 to 400 mm, more preferably 40 to 320 mm, and even more preferably 50 to 150 mm. The shaft diameter of the second pulley may be, for example, 280 to 320 mm. The preferred shaft diameter of the second pulley is determined based on the engine output of the diesel engine and the power generation capacity of the alternator. By connecting a pulley having the preferred shaft diameter between the alternator and the PTO, the engine output of the diesel engine transmitted via the PTO can more stably drive the alternator at a predetermined rotation speed.

[0045] The number of belts wound around the first pulley and the second pulley can be one or more, and preferably multiple. The number of belts is more preferably 2 to 10, even more preferably 3 to 9, even more preferably 4 to 8, and even more preferably 5 to 7. The preferred number of belts is determined based on the engine output of the diesel engine and the power generation capacity of the alternator. By using multiple belts or the preferred number of belts, the alternator can be driven more stably at the desired rotation speed, and belt replacement can be easily performed while reducing belt costs. When multiple belts are used, each belt is arranged in parallel on the first pulley and the second pulley. Figure 6 shows a photograph of an example of six belts wound around the second pulley connected to the alternator.

[0046] The belt may be a conventionally used belt, preferably a V-belt, including standard V-belts, narrow V-belts (wedge type), and multi-type V-belts, and is preferably a belt suitable for high-horsepower transmission and having heat resistance, oil resistance, flame retardancy, and anti-static properties, such as the red V-belt manufactured by Mitsuboshi Belting Co., Ltd.

[0047] The mobile power supply vehicle includes a power generation control circuit. Power generated by the AC generator can be transmitted to a power receiving device via the power generation control circuit. The power generation control circuit can include a changeover switch (COS) for switching between transmitting and not transmitting power to the power receiving device.

[0048] The power generation control circuit is preferably configured to be capable of outputting in a single-phase three-wire system, a three-phase three-wire system, or a combination thereof.

[0049] More preferably, the power generation control circuit is configured to be able to output 100V / 200V for a single-phase three-wire system and 200V for a three-phase three-wire system, 100V / 200V for a single-phase three-wire system and 200V / 400V for a three-phase three-wire system, or 200V / 400V for a three-phase three-wire system. When outputting 100V / 200V for a single-phase three-wire system and 200V / 400V for a three-phase three-wire system, 400V can be generated and stepped down to 200V with a step-down transformer to obtain 100V / 200V. Since a 400V type AC generator can also be used with a step-down transformer to support 100V / 200V, this mobile power supply vehicle equipped with a 400V type AC generator can be used for multiple purposes and can be used in a wider range of applications.

[0050] Depending on the output format, the mobile power supply vehicle can function as a power feeder or a hybrid of a mobile power supply vehicle and a power feeder. For example, if the mobile power supply vehicle outputs 200V / 400V in a three-phase, three-wire system, it can function as a power feeder and supply the generated power to an electric vehicle (EV) charger. When the mobile power supply vehicle is used as a power feeder, it may be equipped with an EV charger as shown in FIG. 4.

[0051] The mobile power supply vehicle may also be equipped with high-voltage electricity, for example, a 6600V AC generator. An example of a 6600V AC generator is an AC generator manufactured by Taiyo Electric Co., Ltd. When a 6600V AC generator is used, the power generation control circuit may include a high-voltage electrical circuit.

[0052] The power generation control circuit may also have a protection circuit for interrupting the circuit for protection when a malfunction occurs on the primary side or secondary side (power receiving device). The mobile power supply vehicle may be equipped with a power supply switching panel, which includes the power generation control circuit and may be equipped with a ground fault circuit interrupter as a protection circuit.

[0053] The AC power that can be generated by this mobile power supply vehicle can be a substantially regular and uniform sine wave. Although the electricity generated by an AC generator is a sine wave, the AC waveform can vary in terms of active power, reactive power, and apparent power depending on the load of the power-receiving device. The power generation control circuit can adapt to these variations and approximate an ideal sine wave. Figure 7 shows a photograph of the oscilloscope graph display screen that measured the electricity when this mobile power supply vehicle outputs a specified voltage of 400V in a three-phase, three-wire system. The graph in Figure 7 shows that a substantially regular and uniform sine wave is obtained.

[0054] Figure 8 shows the results of measuring the graph in Figure 7. The measurement results in Figure 8 show that stable power generation was achieved at 398 V, compared to the specified voltage of 400 V. As such, the AC power that can be generated by this mobile power supply vehicle is a stable, clean sine wave, so the electricity generated by this mobile power supply vehicle can be used in electronic devices such as computers, and this mobile power supply vehicle can also be used in business continuity plans (BCPs) in the event of a disaster.

[0055] Figure 9 shows a graph of the results of a load endurance test conducted on the AC generator included in this mobile power supply vehicle using a load testing machine (LE-330).The AC generator generates electricity by rotating the shaft of the AC generator using rotational energy from the driving force (PTO) of the diesel engine installed in the vehicle, so the power generation capacity varies depending on the engine output (kW) of the diesel engine installed in the vehicle.For this reason, this load test was conducted to derive the appropriate load (voltage, current) values ​​for the combination of the diesel engine output (kW) installed in the vehicle and the AC generator, and to verify the effective maximum capacity of the AC generator.

[0056] For the load test, a mobile power supply vehicle based on a 3-ton truck (2KG-XZU712M, displacement 4.00 kW (L)) equipped with a Hino Motors N04C diesel engine was used.

[0057] The AC generator mounted on the mobile power supply vehicle was a brushless AC generator (synchronous generator, LX-E 46B2) manufactured by Taiyo Electric Co., Ltd. The difference in capacity (A) obtained at 1500 rpm (50 Hz) and 1800 rpm (60 Hz) was examined. The rated output of this AC generator when operated at the specified rotational speeds of 1500 rpm and 1800 rpm was 160 kVA (50 Hz) / 190 kVA (60 Hz), voltage 415 V, and current 223 A (50 Hz) / 264 A (60 Hz). The vehicle's automatic engine output was set to 1500 rpm, and when driving at 1800 rpm, the accelerator was depressed to add 300 rpm to maintain 1800 rpm.

[0058] In a 1500 rpm (50 Hz) test, when the simulated load capacity (A) was gradually increased from 20 A to 120 A to the AC generator, the load at which a voltage of 400 V or more could be obtained was 70 A or less. The load test results show that when using this diesel engine output to obtain a voltage of 400 V or more, the maximum usable load is up to 70 A. In an 1800 rpm (60 Hz) test, when the simulated load capacity (A) was gradually increased from 20 A, belt abnormality and fluttering occurred at 90 A and 1602 revolutions. This was because the diesel engine output was insufficient for the simulated load capacity (A) required by the load device (LE-3000), causing irregular pulley and belt rotation, resulting in fluttering and causing irregular rotation of the shaft connected to the PTO.

[0059] The mobile power supply vehicle may further include a storage battery that is configured to store DC power obtained from an external power source and to supply AC power to a power-receiving device (secondary load).

[0060] FIG. 5 is a block diagram showing the configuration of a power storage device including a storage battery that can be provided in this mobile power supply vehicle. The external power source is, for example, one or more external power sources capable of generating power, such as solar panels, or may be one or more other external power sources. DC power generated by the external power source is stored in the storage battery via a power conditioner. DC power from a diesel engine may also be stored in the storage battery via the power conditioner. The power stored in the storage battery can be supplied as AC power to a power-receiving device (secondary load). The power conditioner is preferably a hybrid PCS, and its input side (solar panel, alternator, etc.) can receive 12V or 24V DC and its output side can output 100V / 200V AC.

[0061] By having such a storage capacity, this mobile power supply vehicle can not only supply the power generated by the AC generator to the power receiving device, but also supply the power stored in the storage device to the power receiving device.

[0062] The mobile power supply vehicle may also store AC power generated by the AC generator in a storage battery via a power generation control circuit and a power conditioner.

[0063] REFERENCE SIGNS LIST 1 vehicle 2 front wheel 3 rear wheel 10 diesel engine 20 PTO 31 first pulley 32 second pulley 40 belt 50 AC generator 100 mobile power supply vehicle

Claims

1. It is a mobile power supply vehicle, Vehicles that can be moved, A diesel engine provided in the aforementioned vehicle, PTO connected to the aforementioned diesel engine, The first pulley connected to the PTO, A second pulley is connected to the first pulley via a belt. An AC generator connected to the second pulley and mechanically connected to the PTO via the first pulley, the belt, and the second pulley, An automatic voltage regulator connected to the AC generator and the diesel engine, An engine control device provided in the aforementioned vehicle, A choke controller connected to the aforementioned diesel engine, and A power generation control circuit connected to the aforementioned AC generator, which supplies the AC power generated by the AC generator to the receiving device. Equipped with, The aforementioned diesel engine is used for both driving the vehicle and generating electricity with the aforementioned AC generator. The PTO is connected to the engine control device and is configured to switch the diesel engine between driving the vehicle and driving the AC generator. The automatic voltage regulator outputs a maintenance request to maintain the rotational speed of the AC generator at a specified rotational speed in order to maintain the frequency and voltage set in the automatic voltage regulator when the load of the power receiving device fluctuates. The engine control device detects whether the diesel engine's rotational speed is excessive or insufficient in response to the maintenance request, and issues a command to the choke controller. The choke controller increases or decreases the engine speed of the diesel engine in response to a command from the engine control device so that the rotational speed of the AC generator is maintained at the specified rotational speed. The power generation control circuit supplies the AC power generated by the AC generator to the power receiving device without converting it back to AC after converting it to DC. Mobile power supply vehicle.

2. The mobile power supply vehicle according to Claim 1, wherein the automatic voltage regulator, the engine control device, the choke controller, the diesel engine, and the PTO each include an ECU, and communication between the ECUs is performed by CAN communication.

3. The mobile power supply vehicle according to claim 1 or 2, wherein the choke controller increases or decreases the rotational speed of the diesel engine so as to maintain the rotational speed of the AC generator within ±7% of the specified rotational speed.

4. The mobile power supply vehicle according to claim 1 or 2, wherein the PTO is operated by electronic control via a changeover switch provided in the vehicle when the vehicle's gear is in neutral, and switches the diesel engine from driving the vehicle to driving the AC generator.

5. The mobile power supply vehicle according to claim 1 or 2, wherein the first pulley, the second pulley, or both thereof are configured to be interchangeable with those having a shaft diameter, number of belts, or both, that are suitable for the output of the diesel engine and the power generation capacity of the AC generator.

6. The power generation control circuit is configured to output in a single-phase three-wire, three-phase three-wire, or a combination thereof, as described in claim 1 or 2 for the mobile power supply vehicle.

7. The power generation control circuit is configured to output 100V / 200V in a single-phase three-wire system and 200V in a three-phase three-wire system, 100V / 200V in a single-phase three-wire system and 200V / 400V in a three-phase three-wire system, or 200V / 400V in a three-phase three-wire system, according to claim 1 or 2.

8. Including a battery, The battery is configured to store DC power obtained from an external power source and to supply AC power to the power receiving device. A mobile power supply vehicle according to claim 1 or 2.