A mobile energy replenishment vehicle for an electrified road transport system

Abstract

The application relates to a mobile energy supplement vehicle for an electrified highway transportation system, comprising: a double-pole pantograph in contact with positive and negative lines of a contact net; an on-board energy hub containing multiple isolated DC / DC converters and contactors, which control the cascaded or independent work of the DC / DC converters to realize charging and discharging functions; a high-voltage box connected with the DC / DC converters; a battery pack storing energy to supply the latter or provide a backup power supply for a load; an electric control converting voltage and managing power supply; and multiple charging interfaces connected with the DC / DC converters to charge vehicles with different power demands. The contactors connect the double-pole pantograph with the DC / DC converters. The scheme adapts to the high-power charging demand of the electrified highway system and the pantograph vehicle.

Description

Technical Field

[0001] This invention relates to the field of transportation technology, specifically to a mobile energy replenishment vehicle for electrified road transport systems. Background Technology

[0002] With increasing global awareness of carbon emissions and environmental protection, the carbon emissions of the transportation industry, especially road transport, have received widespread attention. Statistics show that transportation carbon emissions account for 11% of China's total emissions, with road transport accounting for a staggering 83.4%, making it the largest source of carbon emissions. Therefore, reducing carbon emissions from road transport is an urgent issue that needs to be addressed.

[0003] Currently, the main challenges facing the road transport industry include high energy consumption and emissions, primarily due to the widespread use of traditional fuel-powered vehicles. Electrification of road transport has emerged as a promising direction to address this issue. However, electric vehicles face challenges in long-distance transport, including insufficient range and inadequate charging infrastructure, particularly in remote areas or frigid environments.

[0004] To overcome the limitations of existing electrified road transport systems, electrified road systems have been proposed. These systems use overhead contact lines to power vehicles directly from the network. However, this type of system also has significant limitations, primarily that vehicles face extremely limited range once they leave the sections with overhead contact lines, especially when traveling to remote areas.

[0005] To address the aforementioned issues, the concept of mobile charging vehicles emerged. These vehicles aim to provide temporary charging support for electric vehicles that have left overhead contact line sections, thereby solving the problem of insufficient driving range. However, existing mobile charging vehicles have many shortcomings in terms of cost, charging efficiency, and adaptability, such as high cost of charging equipment, poor compatibility, and voltage reduction when used by high-volume vehicles. Summary of the Invention

[0006] This invention provides a mobile energy replenishment vehicle for electrified road transport systems, which aims to solve the problem of insufficient driving range of vehicles in electrified road transport systems when traveling in areas without overhead contact lines.

[0007] To achieve the above objectives, the present invention provides a mobile energy replenishment vehicle for an electrified highway transportation system, comprising:

[0008] A bipolar pantograph, wherein the bipolar pantograph has a positive pantograph head that makes positive contact with the positive wire of the contact network and a negative pantograph head that makes negative contact with the negative wire of the contact network;

[0009] The vehicle-mounted energy hub includes multiple isolated DC / DC converters and multiple contactors. The multiple isolated DC / DC converters are respectively a first isolated DC / DC converter and a second isolated DC / DC converter. The multiple contactors are used to control the first isolated DC / DC converter and the second isolated DC / DC converter to work in cascade or independently to realize charging and discharging functions.

[0010] The high-voltage box is connected to the first isolated DC / DC converter and the second isolated DC / DC converter;

[0011] The battery pack, connected to the high-voltage box, is used to store energy for later use or to provide backup power for the load;

[0012] An electrical control unit, connected to the high-voltage box, is used to switch voltage levels and manage the power supply to the motor.

[0013] Multiple charging ports are connected to the first isolated DC / DC and the second isolated DC / DC via corresponding contactors for charging other electric vehicles with different power requirements;

[0014] The input terminals of the multiple contactors are connected to the positive wire of the contact network via the positive terminal, and the output terminals are connected to the first isolated DC / DC converter; the output terminals of the multiple contactors are connected to the negative wire of the contact network via the negative terminal, and the output terminals are connected to the second isolated DC / DC converter; the first isolated DC / DC converter and the second isolated DC / DC converter are connected to each other via the contactors.

[0015] Furthermore, the plurality of contactors are: a first contactor, a second contactor, and a third contactor;

[0016] The input terminal of the first contactor is connected to the main line of the contact network via a positive terminal, and the output terminal of the first contactor is connected to the first isolated DC / DC converter.

[0017] The input terminal of the second contactor is connected to the negative wire of the contact network via the negative terminal head, and the output terminal of the second contactor is connected to the second isolated DC / DC converter.

[0018] The first isolated DC / DC and the second isolated DC / DC are connected via the third contactor.

[0019] Furthermore, the plurality of contactors also includes a fourth contactor, through which the first isolated DC / DC and the second isolated DC / DC are also connected.

[0020] Furthermore, the plurality of contactors are further divided into: a fifth contactor, a sixth contactor, a seventh contactor, and an eighth contactor;

[0021] The plurality of charging interfaces are divided into a first charging interface and a second charging interface. The positive wire of the first charging interface is connected to the positive wire of the first isolated DC / DC converter through the fifth contactor, and the negative wire of the first charging interface is connected to the negative wire of the first isolated DC / DC converter through the sixth contactor. The positive wire of the second charging interface is connected to the positive wire of the second isolated DC / DC converter through the seventh contactor, and the negative wire of the second charging interface is connected to the negative wire of the second isolated DC / DC converter through the eighth contactor.

[0022] Furthermore, the number of bipolar pantographs is multiple, and the multiple isolated DC / DC converters are further divided into third isolated DC / DC converters and fourth isolated DC / DC converters; the vehicle-mounted energy center also has multiple contactors for controlling the third isolated DC / DC converters and fourth isolated DC / DC converters to work in cascade or independently to realize charging and discharging functions.

[0023] Furthermore, the vehicle-mounted energy hub is also equipped with a positive DC bus and a negative DC bus. The positive DC bus is configured to connect to the positive heads of the multiple bipolar pantographs, and the negative DC bus is configured to connect to the negative heads of the multiple bipolar pantographs. This is used to collect the electrical energy received from the bipolar pantographs and distribute the electrical energy to the first isolated DC / DC, the second isolated DC / DC, the third isolated DC / DC, and the fourth isolated DC / DC.

[0024] Furthermore, the plurality of contactors are further divided into a first contactor, a second contactor A, and a third contactor A;

[0025] The input terminal of the first contactor A is connected to the main line of the contact network through the positive terminal head, and the output terminal of the first contactor A is connected to the third isolated DC / DC converter.

[0026] The input terminal of the second contactor A is connected to the negative wire of the contact network through the negative terminal head, and the output terminal of the second contactor A is connected to the fourth isolated DC / DC converter.

[0027] The third isolated DC / DC and the fourth isolated DC / DC are connected via the third contactor A.

[0028] Furthermore, the plurality of contactors are further divided into a fourth contactor A, and the third isolated DC / DC and the fourth isolated DC / DC are connected through the fourth contactor A.

[0029] Furthermore, the plurality of contactors are further divided into a fourth contactor A, and the third isolated DC / DC and the fourth isolated DC / DC are connected through the fourth contactor A.

[0030] Furthermore, the plurality of charging interfaces are further divided into a third charging interface and a fourth charging interface. The positive line of the third charging interface is connected to the positive line of the third isolated DC / DC converter through the fifth contactor A, and the negative line of the third charging interface is connected to the negative line of the third isolated DC / DC converter through the sixth contactor A. The positive line of the fourth charging interface is connected to the positive line of the fourth isolated DC / DC converter through the seventh contactor A, and the negative line of the fourth charging interface is connected to the negative line of the fourth isolated DC / DC converter through the eighth contactor A.

[0031] Furthermore, the high-voltage box is equipped with a DC750V busbar.

[0032] The beneficial effects of this invention are:

[0033] Compared with existing technologies, this invention provides a mobile energy replenishment vehicle for electrified highway transportation systems. By integrating a bipolar pantograph, multiple isolated DC / DC converters, a high-voltage box, a battery pack, electronic control, and multiple charging interfaces, it solves the range problem of vehicles in non-contact line areas within electrified highway transportation systems. Specifically, the bipolar pantograph can effectively obtain DC power from the contact network and convert and regulate the voltage through isolated DC / DC converters to adapt to different operating requirements and charging standards. These converters can be cascaded or operated independently, providing flexible charging and discharging functions. In the on-grid charging and discharging mode, the on-board energy central control unit operates some contactors, disconnecting other contactors, allowing the first and second isolated DC / DC converters to cascade in pairs. Through front-end series voltage division, the voltage is connected to the DC 1500V DC bus, and the rear-end parallel outputs a large current, supplying power to the battery pack, electronic control, etc., through the high-voltage box. In this operating mode, the on-board energy central control unit can draw power from the contact network to power the battery pack and electric drive, or draw power from the battery pack to support the stability of the contact network voltage. In the off-grid discharge mode, the contactor of the vehicle energy center control section operates, disconnecting other contactors, allowing the first and second isolated DC / DC converters to operate independently. In this mode, the vehicle energy center draws power from the battery pack and supplies power to other pantograph vehicles (which are equipped with charging sockets) through the charging interface. This greatly improves the operating efficiency of electrified highways and the practicality of vehicles, not only solving the problem of insufficient driving range but also enhancing the adaptability and reliability of the entire electrified highway system, thereby supporting the continued development of electrification in road transport. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below.

[0035] Figure 1 This is a circuit structure diagram of a mobile energy replenishment vehicle for an electrified highway transportation system disclosed in an embodiment of the present invention.

[0036] Reference numerals: 1. First contactor; 2. Second contactor; 3. Third contactor; 4. Fourth contactor; 5. Fifth contactor; 6. Sixth contactor; 7. Seventh contactor; 8. Eighth contactor; 9. First isolated DC / DC converter; 10. Second isolated DC / DC converter; 100. On-board energy center; 200. High voltage box; 300. Battery pack; 400. Electronic control unit; 500. Motor; 600. First charging interface; 700. Second charging interface. Detailed Implementation

[0037] The technical solutions of the embodiments of this application will now be described with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0038] like Figure 1 As shown, this invention provides a mobile energy replenishment vehicle for electrified highway transportation systems to address the problems of limited range of pantograph vehicles after leaving overhead contact line sections and the high cost of existing mobile energy replenishment vehicles, which are unsuitable for electrified highway transportation systems. To achieve the above objectives, this invention provides the following technical solution:

[0039] A mobile energy replenishment vehicle for electrified road transport systems, such as Figure 1 As shown, it includes: N bipolar pantographs, an on-board energy center 100, multiple charging ports, a high-voltage box 200, a battery pack 300, an electronic control unit 400, and a motor 500, etc. Among them:

[0040] The bipolar pantograph connects to the positive line of the overhead contact system via the positive pantograph head and to the negative line of the overhead contact system via the negative pantograph head, transferring the DC 1500V of the overhead contact system to the vehicle-mounted energy center 100.

[0041] The vehicle-mounted energy center 100 is equipped with multiple isolated DC / DC converters and multiple contactors. The multiple isolated DC / DC converters can realize bidirectional power conversion. The vehicle-mounted energy center 100 controls the multiple isolated DC / DC converters to work in cascade or independently to charge and discharge from the overhead contact line or to discharge to other vehicles by controlling the internal contactors.

[0042] Multiple charging ports utilize charging guns conforming to GB / T 20234 standards, enabling the charging of other pantograph vehicles from the onboard energy center 100. The high-voltage box 200 is equipped with a DC 750V bus, providing DC 400-750V power distribution. The battery pack 300 serves as the energy storage device for the mobile charging vehicle; the electronic control unit 400 internally incorporates DC / DC and DC / AC circuits, capable of converting DC 400-750V to DC 12 / 24V to provide auxiliary power to the vehicle, and also converting DC 400-750V to AC power to supply energy to the motor 500. The motor 500 converts electrical energy into mechanical energy, driving the vehicle.

[0043] Specifically, multiple isolated DC / DC converters are designated as a first isolated DC / DC converter 9 and a second isolated DC / DC converter 10; multiple contactors are used to control the first isolated DC / DC converter 9 and the second isolated DC / DC converter 10 to work in cascade or independently to achieve charging and discharging functions. These contactors are: first contactor 1, second contactor 2, third contactor 3, fourth contactor 4, fifth contactor 5, sixth contactor 6, seventh contactor 7, and eighth contactor 8; a high-voltage box 200 is connected to the first isolated DC / DC converter 9 and the second isolated DC / DC converter 10; a battery pack 300 is connected to the high-voltage box 200 to store energy for later use or to provide backup power for the load; an electronic control unit 400 is connected to the high-voltage box 200 to convert voltage levels and manage the power supply of the motor 500; and multiple charging interfaces are connected to the first isolated DC / DC converter 9 and the second isolated DC / DC converter 10 via corresponding contactors to charge other electric vehicles with different power requirements.

[0044] like Figure 1 As shown, the input terminal of the first contactor 1 is connected to the positive wire of the contact network through the positive terminal, and the output terminal of the first contactor 1 is connected to the first isolated DC / DC 9; the input terminal of the second contactor 2 is connected to the negative wire of the contact network through the negative terminal, and the output terminal of the second contactor 2 is connected to the second isolated DC / DC 10; the first isolated DC / DC 9 and the second isolated DC / DC 10 are connected by a third contactor 3. In order to keep the first isolated DC / DC 9 and the second isolated DC / DC 10 consistent in structure, a fourth contactor 4 can also be set between the first isolated DC / DC 9 and the second isolated DC / DC 10 to standardize the overall circuit structure.

[0045] The multiple charging interfaces are divided into a first charging interface 600 and a second charging interface 700. The positive line of the first charging interface 600 is connected to the positive line of the first isolated DC / DC 9 through a fifth contactor 5, and the negative line of the first charging interface 600 is connected to the negative line of the first isolated DC / DC 9 through a sixth contactor 6. The positive line of the second charging interface 700 is connected to the positive line of the second isolated DC / DC 10 through a seventh contactor 7, and the negative line of the second charging interface 700 is connected to the negative line of the second isolated DC / DC 10 through an eighth contactor 8.

[0046] As can be seen from the overall circuit connection structure described above, the vehicle energy center 100 has two working modes: one is the on-grid charging and discharging working mode, and the other is the off-grid discharging working mode. The vehicle energy center 100 controls the switching of working modes through multiple internal contactors.

[0047] In the grid charging and discharging operation mode, the vehicle-mounted energy center 100 controls the operation of the first contactor 1, the second contactor 2, the third contactor 3, and the fourth contactor 4 (as well as the first contactor A, the second contactor A, the third contactor A, and the fourth contactor A), disconnects other contactors, and the first isolated DC / DC 9 and the second isolated DC / DC 10 (as well as the third isolated DC / DC and the fourth isolated DC / DC) are cascaded in pairs. Through the front-end series voltage division, they are connected to the DC 1500V DC bus, and the rear-end parallel outputs a large current, which is supplied to the battery pack 300, the electronic control unit 400, etc. through the high-voltage box 200. In this operation mode, the vehicle-mounted energy center 100 can draw power from the contact network to supply power to the battery pack 300 and the electric drive, and can also draw power from the battery pack 300 to support the stability of the contact network voltage.

[0048] In the off-grid discharge mode, the vehicle-mounted energy hub 100 controls the fifth contactor 5, the sixth contactor 6, the seventh contactor 7, and the eighth contactor 8 (as well as the fifth contactor A, the sixth contactor A, the seventh contactor A, and the eighth contactor A) to operate, disconnecting other contactors. The first isolated DC / DC 9 and the second isolated DC / DC 10 (as well as the third isolated DC / DC and the fourth isolated DC / DC) operate independently. In this mode, the vehicle-mounted energy hub 100 draws power from the battery pack 300 and supplies power to other pantograph vehicles (which are equipped with charging sockets) through the first charging interface 600 and the second charging interface 700 (the third charging interface and the fourth charging interface).

[0049] Because the pantograph vehicles need to be charged, the isolated DC / DC voltage needs to meet the DC 400-750V voltage regulation requirements of commercial vehicles. Since the overhead contact line is a DC 1500V system, two isolated DC / DC converters are cascaded in the grid charging / discharging mode. The front end is connected in series to divide the voltage (making the input voltage of each isolated DC / DC converter DC 750V) and connected to the DC bus, while the rear end is connected in parallel to output a large current. In the off-grid discharging mode, each isolated DC / DC converter operates independently, outputting DC 400-750V to charge the vehicles.

[0050] Please continue reading. Figure 1 When there are multiple bipolar pantographs, and the multiple isolated DC / DC converters are further divided into third isolated DC / DC and fourth isolated DC / DC converters; the corresponding vehicle energy center also has multiple contactors for controlling the third isolated DC / DC and fourth isolated DC / DC converters to work in cascade or independently, to realize charging and discharging functions, namely first contactor A, second contactor A, third contactor A, fourth contactor A, fifth contactor A, sixth contactor A, seventh contactor A, and eighth contactor A.

[0051] By setting up multiple bipolar pantographs, the multiple bipolar pantographs can reliably make contact with the positive and negative lines of the contact network, and input the DC1500V of the contact network to the vehicle-mounted energy center 100. In addition, the vehicle-mounted energy center 100 is equipped with a DC1500V positive DC bus and a negative DC bus, which combine the input of N bipolar pantographs to the positive DC bus and the negative DC bus.

[0052] The positive DC bus is configured to connect to the positive heads of multiple bipolar pantographs, and the negative DC bus is configured to connect to the negative heads of multiple bipolar pantographs. It is used to collect the electrical energy received from the bipolar pantographs and distribute the electrical energy to the first isolated DC / DC9, the second isolated DC / DC10, the third isolated DC / DC, and the fourth isolated DC / DC.

[0053] In the vehicle-mounted energy hub 100, the connection methods of the first contactor A, the second contactor A, the third contactor A, the fourth contactor A, the fifth contactor A, the sixth contactor A, the seventh contactor A, the eighth contactor A, the third isolated DC / DC, the fourth isolated DC / DC, as well as the third charging interface and the fourth charging interface can be found in the above content and will not be repeated here.

[0054] The above are merely specific application examples of the present invention and do not constitute any limitation on the scope of protection of the present invention. All technical solutions formed by equivalent transformations or substitutions fall within the scope of protection of the present invention.

Claims

1. A mobile energy replenishment vehicle for an electrified road transport system, characterized in that, include: A bipolar pantograph, wherein the bipolar pantograph has a positive pantograph head that makes positive contact with the positive wire of the contact network and a negative pantograph head that makes negative contact with the negative wire of the contact network; The vehicle-mounted energy hub includes multiple isolated DC / DC converters and multiple contactors, wherein the multiple isolated DC / DC converters are respectively a first isolated DC / DC converter and a second isolated DC / DC converter; Multiple contactors are used to control the first isolated DC / DC and the second isolated DC / DC to work in cascade or independently, so as to realize charging and discharging functions; The high-voltage box is connected to the first isolated DC / DC converter and the second isolated DC / DC converter; The battery pack, connected to the high-voltage box, is used to store energy for later use or to provide backup power for the load; An electrical control unit, connected to the high-voltage box, is used to switch voltage levels and manage the power supply to the motor. Multiple charging ports are connected to the first isolated DC / DC and the second isolated DC / DC via corresponding contactors for charging other electric vehicles with different power requirements; The input terminals of the multiple contactors are connected to the positive wire of the contact network via the positive terminal, and the output terminals are connected to the first isolated DC / DC converter; the output terminals of the multiple contactors are connected to the negative wire of the contact network via the negative terminal, and the output terminals are connected to the second isolated DC / DC converter; the first isolated DC / DC converter and the second isolated DC / DC converter are connected to each other via the contactors.

2. The mobile energy replenishment vehicle for an electrified highway transport system as described in claim 1, characterized in that, The plurality of contactors are: a first contactor, a second contactor, and a third contactor; The input terminal of the first contactor is connected to the main line of the contact network via a positive terminal, and the output terminal of the first contactor is connected to the first isolated DC / DC converter. The input terminal of the second contactor is connected to the negative wire of the contact network via the negative terminal head, and the output terminal of the second contactor is connected to the second isolated DC / DC converter. The first isolated DC / DC and the second isolated DC / DC are connected via the third contactor.

3. The mobile energy replenishment vehicle for an electrified highway transport system as described in claim 1, characterized in that, The plurality of contactors also includes a fourth contactor, through which the first isolated DC / DC and the second isolated DC / DC are further connected.

4. The mobile energy replenishment vehicle for an electrified highway transport system as described in claim 1, characterized in that, The multiple contactors are further divided into: fifth contactor, sixth contactor, seventh contactor and eighth contactor; The plurality of charging interfaces are divided into a first charging interface and a second charging interface. The positive wire of the first charging interface is connected to the positive wire of the first isolated DC / DC converter through the fifth contactor, and the negative wire of the first charging interface is connected to the negative wire of the first isolated DC / DC converter through the sixth contactor. The positive wire of the second charging interface is connected to the positive wire of the second isolated DC / DC converter through the seventh contactor, and the negative wire of the second charging interface is connected to the negative wire of the second isolated DC / DC converter through the eighth contactor.

5. The mobile energy replenishment vehicle for an electrified highway transport system as described in claim 1, characterized in that, The number of bipolar pantographs is multiple, and the multiple isolated DC / DC converters are further divided into third isolated DC / DC converters and fourth isolated DC / DC converters; the vehicle-mounted energy center also has multiple contactors for controlling the third isolated DC / DC converters and fourth isolated DC / DC converters to work in cascade or independently to realize charging and discharging functions.

6. The mobile energy replenishment vehicle for an electrified highway transport system as described in claim 5, characterized in that, The vehicle-mounted energy hub is also equipped with a positive DC bus and a negative DC bus. The positive DC bus is configured to connect to the positive heads of the multiple bipolar pantographs, and the negative DC bus is configured to connect to the negative heads of the multiple bipolar pantographs. It is used to collect the electrical energy received from the bipolar pantographs and distribute the electrical energy to the first isolated DC / DC, the second isolated DC / DC, the third isolated DC / DC, and the fourth isolated DC / DC.

7. The mobile energy replenishment vehicle for an electrified road transport system as described in claim 5, characterized in that, The multiple contactors are further divided into a first contactor, a second contactor A, and a third contactor A; The input terminal of the first contactor A is connected to the main line of the contact network through the positive terminal head, and the output terminal of the first contactor A is connected to the third isolated DC / DC converter. The input terminal of the second contactor A is connected to the negative wire of the contact network through the negative terminal head, and the output terminal of the second contactor A is connected to the fourth isolated DC / DC converter. The third isolated DC / DC and the fourth isolated DC / DC are connected via the third contactor A.

8. The mobile energy replenishment vehicle for an electrified road transport system as described in claim 7, characterized in that, The plurality of contactors are further divided into a fourth contactor A, and the third isolated DC / DC and the fourth isolated DC / DC are also connected through the fourth contactor A.

9. The mobile energy replenishment vehicle for an electrified highway transport system as described in claim 8, characterized in that, The plurality of contactors are: fifth contactor A, sixth contactor A, seventh contactor A, and eighth contactor A; The multiple charging interfaces are further divided into a third charging interface and a fourth charging interface. The positive line of the third charging interface is connected to the positive line of the third isolated DC / DC converter through the fifth contactor A, and the negative line of the third charging interface is connected to the negative line of the third isolated DC / DC converter through the sixth contactor A. The positive line of the fourth charging interface is connected to the positive line of the fourth isolated DC / DC converter through the seventh contactor A, and the negative line of the fourth charging interface is connected to the negative line of the fourth isolated DC / DC converter through the eighth contactor A.

10. The mobile energy replenishment vehicle for an electrified road transport system as described in any one of claims 1-9, characterized in that, The high-voltage box is equipped with a DC750V busbar.

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