Vehicle-mounted range extending system, vehicle and charging method of vehicle

Abstract

The invention discloses a vehicle-mounted range extending system, a vehicle and a charging method of the vehicle, and the vehicle-mounted range extending system comprises an ACDC circuit, a three-phase winding of a generator, a first switch unit, a vehicle-mounted charging unit and a second switch unit; a three-phase winding of the generator is connected with the ACDC circuit through the first switch unit, so that the three-phase winding of the generator is controlled to be communicated with the ACDC circuit; the vehicle-mounted charging unit is connected with the ACDC circuit through the second switch unit so as to control the on-off of the three-phase winding of the generator and the ACDC circuit; under the condition that the first switch unit is in an open state and the second switch unit is in a closed state, the vehicle-mounted range extending system is in an alternating current charging state, and the ACDC circuit is used for rectifying and outputting received alternating current electric energy to a battery pack of a vehicle; the device is simple in structure, low in charging loss and low in improvement cost.

Description

Technical Field

[0001] This invention belongs to the field of new energy vehicle technology, specifically an on-board range extender system, a vehicle, and a charging method for the vehicle. Background Technology

[0002] With the rapid development of the new energy vehicle industry and the limited availability of non-renewable fossil fuels globally, electric passenger vehicle solutions using different technologies have gained consumer acceptance in recent years, with hybrid and range-extended electric vehicles showing particularly strong growth. The range extender, a key component in these vehicles, has become a focus of research and technological breakthroughs.

[0003] The vehicle range extender and the vehicle OBC are two separate components, and installing these two separate components on the vehicle requires a large amount of space.

[0004] Chinese invention patent CN118249485A discloses an on-board charger, a vehicle, and a charging method for the vehicle, relating to the field of new energy vehicle technology. The on-board charger includes a resonant circuit comprising a three-phase winding of a generator and a relay unit connected to the three-phase winding. When the relay unit is in an open state, the on-board charger operates in a range-extending generator state. The resonant circuit provides control voltage to the three-phase winding of the generator to control the rotation of the generator and the range-extending engine mechanically linked to the generator, and rectifies and outputs the AC power generated by the rotation of the range-extending engine and the generator to the vehicle's battery pack.

[0005] Although this type of on-board charger integrates the on-board range extender and the on-board charger, it has a complex structure, adding multiple capacitors, inductors and transformers, resulting in higher charging losses. Furthermore, it requires modifications to the internal circuitry of the on-board range extender's generator, which is costly. Summary of the Invention

[0006] The purpose of this invention is to provide an on-board range extender system, a vehicle, and a charging method for the vehicle, in order to solve at least one of the aforementioned technical problems.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: An on-board range extender system includes: an AC-DC circuit, a three-phase winding of a generator, a first switching unit, an on-board charging unit, and a second switching unit; The three-phase windings of the generator are connected to the ACDC circuit through the first switching unit, so as to realize the connection between the three-phase windings of the generator and the ACDC circuit by controlling the connection through the first switching unit; The on-board charging unit is connected to the ACDC circuit through the second switching unit, so as to control the on / off of the generator's three-phase windings and the ACDC circuit through the second switching unit; When the first switching unit is in the open state and the second switching unit is in the closed state, the on-board range extender system is in AC charging state, and the ACDC circuit is used to rectify and output the received AC power to the vehicle's battery pack.

[0008] Furthermore, when the first switch unit is in the closed state and the second switch unit is in the open state, the on-board range extender system operates in the range extender generation state. The AC-CDC circuit is used to provide control voltage to the three-phase windings of the generator to control the rotation of the generator and the range extender engine mechanically linked to the generator, and to rectify and output the AC power generated by the rotation of the range extender engine and the generator to the vehicle's battery pack.

[0009] Furthermore, the ACDC circuit includes a three-phase parallel full-bridge switching unit, and each phase of the full-bridge switching unit includes two first switching transistors connected in series.

[0010] Furthermore, the first switching unit includes three first switching relays, and each phase winding of the generator's three-phase winding is connected to the connection point of the two first switching transistors included in the full-bridge switching unit through one of the first switching relays.

[0011] Furthermore, the second switching unit includes two second switching relays, and the on-board charging unit includes an AC charging socket, which includes a live wire and a neutral wire. The live wire and neutral wire of the AC charging socket are respectively connected to the connection point of the two first switching transistors included in the full-bridge switching unit through a second switching relay.

[0012] Furthermore, an inductor is connected in series between one live wire and one neutral wire of the AC charging socket and its corresponding second switching relay.

[0013] Furthermore, the ACDC circuit also includes a chopper unit connected in parallel with the three-phase full-bridge switching unit. The chopper unit includes a chopper element and a capacitor connected in parallel. The chopper element includes a second switching transistor and a first diode connected in series. The generator also includes an excitation coil, one end of which is connected to the connection point of a second switching transistor and a first diode included in the chopper element. The chopper unit is connected in parallel with a third switching unit, which includes a third switching relay and a fourth switching relay connected in series. The other end of the generator's excitation coil is connected to the connection point of the third switching relay and the fourth switching relay included in the third switching unit.

[0014] Furthermore, it also includes a high-voltage pre-charge module, one end of which is connected to a first terminal, which is a common connection point of one end of the capacitor, the end of the second switching transistor away from the first diode, and one end of the three-phase full-bridge switching unit; The other end of the high-voltage precharge module is connected to the second terminal, which is the positive terminal of the battery pack. The end of the fourth switching relay that is away from the third switching relay is also connected to the second terminal. The end of the third switching relay that is away from the fourth switching relay is connected to the negative terminal of the battery pack. The high-voltage pre-charge module includes a fifth switching relay and a pre-charge unit connected in parallel. The pre-charge unit includes a resistor and a third diode connected in series.

[0015] The present invention also provides a vehicle comprising the above-described on-board range extender system.

[0016] The present invention also provides a charging method for the vehicle described above, the vehicle further comprising a battery pack and an on-board charging unit; the method comprising: The first switch unit is controlled to be in the open state, and the second switch unit is controlled to be in the closed state, so that the on-board range extender system operates in AC charging state; When the on-board range extender system is determined to be operating in AC charging mode, the received AC power is rectified by the ACDC circuit and then used to charge the battery pack.

[0017] Compared with the prior art, the beneficial effects of the present invention are: In the above technical solution, an on-board range extender system includes: an AC-CDC circuit, a three-phase winding of a generator, a first switching unit, an on-board charging unit, and a second switching unit. The three-phase winding of the generator is connected to the AC-CDC circuit through the first switching unit, so as to realize the connection between the three-phase winding of the generator and the AC-CDC circuit by controlling the connection through the first switching unit. The on-board charging unit is connected to the AC-CDC circuit through the second switching unit, so as to realize the connection between the three-phase winding of the generator and the AC-CDC circuit by controlling the connection through the second switching unit. When the first switching unit is in the open state and the second switching unit is in the closed state, the on-board range extender system is in AC charging state, and the AC-CDC circuit is used to charge the received AC power. The rectified output is supplied to the vehicle's battery pack. This application's on-board range extender system only adds an on-board charging unit, a first switch unit, and a second switch unit to the existing on-board range extender system. This integrates the existing on-board range extender system and on-board charger. The generator and on-board charging unit share an AC-DC circuit. By controlling the first switch unit to open and the second switch unit to close, the on-board range extender system is in AC charging mode. The AC-DC circuit rectifies the received AC power and outputs it to the vehicle's battery pack, achieving AC charging. Compared to existing on-board chargers with integrated range extenders, this application has a simpler structure, lower charging losses, and the on-board charging unit is directly connected to the AC-DC circuit, requiring no modification to the generator, making modifications simple and cost-effective. Attached Figure Description

[0018] Figure 1 This is one of the structural schematic diagrams of an on-board range extender system in this embodiment; Figure 2 This is a second schematic diagram of the structure of a vehicle-mounted range extender system in this embodiment; Figure 3 This is a flowchart illustrating a vehicle charging method in this embodiment; In the diagram: 101, On-board range extender system; 102, ACDC circuit; 103, First switching unit; 104, Second switching unit; 105, Three-phase winding of generator; 106, On-board charging unit. Detailed Implementation

[0019] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] To facilitate a clearer understanding of the various embodiments of this application, some related technologies will be introduced as follows.

[0021] To improve the driving range of new energy electric vehicles, the following five related technologies are currently commonly used: The first method is to use a large-capacity battery pack to increase the maximum pure electric range.

[0022] This approach increases vehicle weight while increasing battery capacity. The heavier the vehicle, the higher the power consumption. With the same increase in battery capacity, the increase in range becomes smaller and smaller. The large battery capacity is not needed in most travel situations, reducing resource utilization. The increased vehicle weight leads to increased power consumption, and in most short-distance travel scenarios, it actually increases the vehicle's power consumption (compared to vehicles with medium to low battery capacity).

[0023] The second option is to use a range extender / hybrid to increase fuel range.

[0024] Range extenders / hybrid motors are heavy, which indirectly increases the vehicle's power consumption in most short-distance driving scenarios (compared to vehicles without range extenders); range extenders / hybrid motors are expensive, increasing the vehicle's cost, but their utilization rate is low; range extenders / hybrid motors occupy a lot of space, reducing the storage space available to users.

[0025] The third method: Use super-fast charging to significantly increase charging power.

[0026] Super-fast charging places high demands on battery technology, significantly increasing costs and bringing more product lifespan and reliability issues. Super-fast charging also places high demands on charging infrastructure; currently, there are few supercharging stations and supercharging piles, making it more difficult for users to obtain supercharging services.

[0027] The fourth method is to use battery swapping technology to reduce charging waiting time.

[0028] Because battery packs are highly customized to different vehicle models, battery swapping services can currently only be provided for some models, making it difficult to promote and apply them on a large scale. Battery swapping stations always have battery packs waiting to be swapped, and the system design of battery swapping stations is complex and requires high investment. At present, they can only be set up in densely populated urban areas, making it difficult to promote and cover highways and underdeveloped areas.

[0029] The fifth method is to use an external power bank to increase the vehicle's total available battery power.

[0030] Power bank systems are complex and heavy, significantly increasing power consumption while increasing vehicle range; power banks require additional charging and maintenance after use, making them inconvenient to use; and power banks have limited capacity, making it impossible to continuously replenish the vehicle's power.

[0031] In the prior art, in view of the defects of the second related technology (i.e., using a range extender / hybrid engine to increase fuel range), there is a related patent that provides an on-board charger, a vehicle and a charging method for the vehicle, which can realize the reuse of the on-board charger as a generator controller to control the generator and the range extender engine mechanically linked with the generator to generate electrical energy, thereby improving the utilization rate of components and reducing vehicle cost, weight, power consumption and space occupation.

[0032] However, although the above-mentioned solution integrates the on-board range extender and the on-board charger, it has a complex structure, adds multiple capacitors, inductors and transformers, has high charging losses, and requires modification of the internal circuitry of the generator in the on-board range extender, which is costly.

[0033] This application addresses the shortcomings of existing on-board chargers by providing an on-board range extender system, a vehicle, and a charging method for the vehicle. Based on the integration of existing on-board range extender systems and on-board chargers, the solution provided in this application has a simpler structure, lower charging losses, and does not require modification of the internal circuitry of the generator in the on-board range extender, resulting in lower modification costs.

[0034] The following description, in conjunction with the accompanying drawings of the embodiments of this application, provides an exemplary description of an on-board range extender system, a vehicle, and a vehicle charging method provided in the embodiments of this application.

[0035] like Figure 1 and Figure 2 As shown, this embodiment provides an on-board range extender system 101, including: an AC / DC circuit 102, a three-phase winding of a generator 105, a first switching unit 103, an on-board charging unit 106, and a second switching unit 104.

[0036] The three-phase winding 105 of the generator is connected to the ACCDC circuit 102 through the first switching unit 103, so as to realize the connection between the three-phase winding 105 of the generator and the ACCDC circuit 102 through the first switching unit 103. The on-board charging unit 106 is connected to the ACDC circuit 102 through the second switching unit 104, so as to realize the switching of the generator's three-phase winding 105 and the ACDC circuit 102 through the second switching unit 104. When the first switch unit 103 is in the open state and the second switch unit 104 is in the closed state, the on-board range extender system 101 is in AC charging state, and the AC-DC circuit 102 is used to rectify and output the received AC power to the vehicle's battery pack.

[0037] In some embodiments, the on-board range extender system 101 includes a three-phase winding 105 of a generator. It should be noted that generators are typically three-phase, therefore the on-board range extender system 101 of this application embodiment includes a three-phase winding 105 of a generator.

[0038] It should be noted that generator windings are composed of conductor coils. When current flows through the windings, a rotating magnetic field is generated, thus converting mechanical energy into electrical energy. Windings are generally divided into stator windings and rotor windings. The stator winding is the part of the stator where coils are wound, while the rotor winding is the part of the rotor where coils are wound. Generator winding materials include copper wire, aluminum wire, and silver wire, among others. Copper wire has better conductivity and corrosion resistance, and therefore is commonly used in generator winding manufacturing.

[0039] Windings play a crucial role in generators. They not only convert mechanical energy into electrical energy but also regulate electrical parameters such as voltage and frequency. Generator windings can be categorized into two types: concentrated windings and distributed windings. Concentrated windings refer to windings where each turn is connected directly from the positive and negative terminals of the power source, while distributed windings combine multiple windings in parallel or series. Distributed windings have a more complex structure but can result in higher generator efficiency.

[0040] As the core component of a generator, the winding has at least the following functions: (1) Converting mechanical energy into electrical energy. The windings in a generator can convert mechanical energy into electrical energy, which is the essential function of a generator.

[0041] (2) Generating a magnetic field. The current in the windings passing through the current-carrying wires will generate a magnetic field, thereby generating a rotational torque that drives the rotor to rotate.

[0042] (3) Adjust electrical parameters. By changing parameters such as the number of turns and cross-sectional area of ​​the winding, the stress on the electrical appliance can be reduced, thereby protecting its lifespan.

[0043] (4) Improve efficiency. By rationally designing the structure and materials of the windings, the efficiency of the generator can be improved and energy consumption reduced.

[0044] In some embodiments, if the first switch unit 103 is in the open state and the second switch unit 104 is in the closed state, the on-board range extender system 101 is in the AC charging state, and the AC-DC circuit 102 is used to rectify and output the received AC power to the vehicle's battery pack.

[0045] In some embodiments, if the first switch unit 103 is in the closed state and the second switch unit 104 is in the open state, the on-board range extender system 101 operates in the range extender generation state. The AC-DC circuit 102 is used to provide control voltage to the three-phase winding 105 of the generator to control the rotation of the generator and the range extender engine mechanically linked to the generator, and to rectify and output the AC power generated by the rotation of the range extender engine and the generator to the vehicle's battery pack.

[0046] The on-board range extender system 101 of this application only adds an on-board charging unit 106, a first switching unit 103, and a second switching unit 104 to the existing on-board range extender system 101. That is, it realizes the integration of the existing on-board range extender system 101 and the existing on-board charger. The generator and the on-board charging unit 106 share the AC-DC circuit 102. By controlling the first switching unit 103 to open and the second switching unit 104 to close, the on-board range extender system 101 is in AC charging state. The AC power received is rectified and output to the vehicle's battery pack using the AC-DC circuit 102, which can realize AC charging. Compared with the existing on-board chargers that integrate range extenders, this application has a simpler structure and less charging loss. The on-board charging unit 106 is directly connected to the AC-DC circuit 102, which does not require modification of the generator. The modification is simple and the cost is low.

[0047] In some embodiments, the on-board range extender system 101 further includes a control unit for controlling the AC-DC circuit 102, the three-phase winding 105 of the generator, the first switching unit 103, the on-board charging unit 106, and the second switching unit 104, including controlling the closing and opening of the first switching unit 103 and the second switching unit 104, so that the on-board range extender system 101 operates in different states. Specifically, if the control unit controls the first switching unit 103 to be closed and controls the second switching unit 104 to be open, the on-board range extender system 101 operates in a range-extending generation state; if the control unit controls the first switching unit 103 to be open and controls the second switching unit 104 to be closed, the on-board range extender system 101 operates in an AC charging state.

[0048] In some embodiments, the ACCDC circuit 102, the three-phase winding 105 of the generator, the first switching unit 103, the on-board charging unit 106, and the second switching unit 104 included in the on-board range extender system 101 are all electrically connected to the control unit.

[0049] In some embodiments, the ACDC circuit 102 includes three-phase parallel full-bridge switching units, and each phase full-bridge switching unit includes two first switching transistors connected in series.

[0050] In some embodiments, the first switching unit 103 includes three first switching relays, and each phase winding of the generator's three-phase winding 105 is connected to the connection point of the two first switching transistors included in a phase full-bridge switching unit through a first switching relay.

[0051] In some embodiments, the second switching unit 104 includes two second switching relays, and the on-board charging unit 106 includes an AC charging socket, which includes a live wire and a neutral wire. The live wire and the neutral wire of the AC charging socket are respectively connected to the connection point of the two first switching transistors included in the one-phase full-bridge switching unit through a second switching relay.

[0052] In some embodiments, an inductor is connected in series between one live wire and one neutral wire of the AC charging socket and its corresponding second switching relay. These two inductors are respectively... Figure 2 L2 and L3 in the middle.

[0053] In some embodiments, the ACDC circuit 102 further includes a chopper unit connected in parallel with the three-phase full-bridge switching unit. The chopper unit includes a chopper element and a capacitor C1 connected in parallel. The chopper element includes a second switch Q7 and a first diode D8 connected in series. The generator also includes an excitation coil L4, one end of which is connected to the connection point of a second switching transistor and a first diode included in the chopper element. The chopper unit is connected in parallel with a third switching unit, which includes a third switching relay and a fourth switching relay connected in series. The other end of the generator's excitation coil is connected to the connection point of the third switching relay and the fourth switching relay included in the third switching unit.

[0054] In some embodiments, a high-voltage precharge module is also included. One end of the high-voltage precharge module is connected to a first terminal, which is a common connection point of one end of a capacitor, one end of a second switching transistor away from a first diode, and one end of a three-phase full-bridge switching unit. The other end of the high-voltage precharge module is connected to the second terminal, which is the positive terminal of the battery pack. The end of the fourth switching relay that is opposite to the third switching relay is also connected to the second terminal. The end of the third switching relay that is opposite to the fourth switching relay is connected to the negative terminal of the battery pack. The high-voltage precharge module includes a fifth switching relay K5 connected in parallel and a precharge unit, which includes a resistor R1 and a third diode D9 connected in series.

[0055] It is understood that, based on the vehicle-mounted range extender system 101 provided in this application embodiment, if the first switching unit 103 in the vehicle-mounted range extender system 101 is closed, the second switching unit 104 is opened, the third switching relay is closed, and the fourth switching relay is opened, that is, all three first switching relays and the third switching relay are closed, and all two second switching relays and the fourth switching relay are opened, then the full-bridge switching unit constituting the ACDC circuit 102 in the vehicle-mounted range extender system 101 can provide control voltage to the three-phase winding 105 of the generator, and provide voltage to the excitation coil through the chopper unit, so that the excitation coil generates a magnetic field, thereby driving the generator to start rotating. Since the generator and the range extender engine are mechanically linked, the speed of the range extender engine can be indirectly increased.

[0056] When the range extender engine speed rises to a certain range, it can successfully perform fuel injection and ignition, and enter its working output state. After the range extender engine enters the working output state, the full-bridge switching unit in the ACDC circuit 102 switches to the power generation control state, rectifies the electrical energy output from the three-phase winding 105 of the generator, and outputs it to the vehicle's battery pack, thereby realizing range-extending power generation.

[0057] It should be noted that the AC-DC circuit 102 can rectify AC power into DC power and output it to the vehicle's battery pack to charge the vehicle.

[0058] It is understood that, based on the vehicle range extender system 101 provided in this application embodiment, if the first switching unit 103 in the vehicle range extender system 101 is disconnected, the second switching unit 104 is closed, the third switching relay is disconnected, and the fourth switching relay is closed, that is, all three first switching relays and the third switching relay are disconnected, and all two second switching relays and the fourth switching relay are closed, then the full-bridge switching unit of the ACDC circuit 102 in the vehicle range extender system 101 can receive AC power from the vehicle charging unit 106 and rectify the received AC power to output to the vehicle's battery pack. During the process of the AC power from the vehicle charging unit 106 being rectified and output to the vehicle's battery pack, the AC power from the vehicle charging unit 106 first charges the capacitor C1 in the chopper unit, and then uses the capacitor C1 to charge the battery pack.

[0059] For example, Figure 2 This is a second structural schematic diagram of an on-board range extender system 101 provided in an embodiment of this application, as shown below. Figure 2As shown, when all three first switching relays K1a, K1b, K1c and the third switching relay K3 are open, and both second switching relays K2a, K2b and the fourth switching relay K4 are closed, the on-board range extender system 101 can operate in AC charging mode. In this mode, the vehicle's battery pack is connected to the ACDC circuit 102, and one phase of the AC charging socket (live wire L1 and neutral wire N) is connected to the external power grid. The ACDC circuit 102 rectifies the electrical energy input from the external power grid and outputs it to the battery pack, thereby charging the vehicle's battery pack.

[0060] exist Figure 2 In the AC-CDC circuit 102, first switching transistors Q1 to Q6 are included; first switching unit 103 includes three first switching relays K1a, K1b, and K1c; second switching unit 104 includes two second switching relays K2a and K2b; and on-board charging unit 106 includes an AC charging socket, which includes one live wire L1 and one neutral wire N. When the three first switching relays K1a, K1b, and K1c are in the open state, the connection points U, V, and W of the three-phase windings 105 of the generator (i.e., the three-phase ports of the generator) are disconnected from the AC-CDC circuit 102 and do not participate in the circuit operation.

[0061] It should be noted that, Figure 2 The generator winding inductances Lu, Lv, and Lw in the above text are equivalent to the three-phase winding 105 of the generator mentioned above.

[0062] For example, such as Figure 2 As shown, when all three first switching relays K1a, K1b, and K1c, as well as the third switching relay K3, are closed, and both second switching relays K2a and K2b, as well as the fourth switching relay K4, are open, the on-board range extender system 101 can operate in range extender generation mode. In this mode, the vehicle's battery pack is connected to the ACDC circuit 102, and one phase of the AC charging socket (live wire L1 and neutral wire N) is not connected to the external power grid.

[0063] Initially, the range extender engine is in a non-started state with zero speed, requiring external stimulation to reach a certain speed before ignition and operation. At this time, capacitor C1, the second switch Q7, and the first diode D8 of the control chopper unit provide voltage to the excitation coil L4, and the first switches Q1-Q6 of the three-phase full-bridge switching unit provide control voltage to the generator, causing it to start rotating. Due to the mechanical linkage between the generator and the range extender engine, the generator's speed can be indirectly increased. Once the range extender engine reaches a certain speed range, fuel injection and ignition can proceed smoothly, and it enters its operating output state. After the range extender engine enters operating output, the first switches Q1-Q6 of the three-phase full-bridge switching unit switch into the power generation control state, rectifying the electrical energy output from the generator's three-phase windings and supplying it to the battery pack, reaching the positive and negative terminals of the battery pack, thus achieving range-extended power generation.

[0064] The present invention also provides a vehicle, the vehicle including the above-described on-board range extender system 101.

[0065] The present invention also provides a charging method for the aforementioned vehicle, the vehicle further comprising a battery pack and an on-board charging unit 106; the method comprising: The first switch unit 103 is controlled to be in the open state, and the second switch unit 104 is controlled to be in the closed state, so that the on-board range extender system 101 operates in the AC charging state. When the on-board range extender system 101 is determined to be operating in AC charging mode, the AC power received is rectified by the AC-DC circuit 102 and then used to charge the battery pack.

[0066] When external power is needed for charging, the AC charging gun is plugged into the AC charging socket to wake up the control unit. The control unit controls the three first switching relays K1a, K1b, and K1c, as well as the third switching relay K3, to open, and controls the two second switching relays K2a and K2b, as well as the fourth switching relay K4, to close. After the control unit completes the low-voltage self-test, it performs high-voltage pre-charging. After the pre-charging is completed, the fifth switching relay K5 is opened. The control unit communicates with the AC charging pile through the CP signal. The AC charging pile closes the AC contactor to supply AC 220V power based on the signal that the S2 switch of the car is closed. The control unit detects the AC 220V input, performs PFC power factor correction, and simultaneously starts AC-CDC inverter operation to charge the battery pack.

[0067] It should be noted that although the present invention has been disclosed above with specific embodiments, the above embodiments are not intended to limit the present invention. Those skilled in the art can make various modifications and refinements without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention shall be determined by the scope defined in the claims.

Claims

1. A vehicle-mounted range extender system, characterized by, The application relates to a vehicle range extender system, comprising: an ACDC circuit, a three-phase winding of a generator, a first switch unit, an on-board charging unit and a second switch unit; the three-phase winding of the generator is connected with the ACDC circuit through the first switch unit, so that the communication between the three-phase winding of the generator and the ACDC circuit is controlled through the first switch unit; the on-board charging unit is connected with the ACDC circuit through the second switch unit, so that the communication between the three-phase winding of the generator and the ACDC circuit is controlled through the second switch unit; when the first switch unit is in an open state and the second switch unit is in a closed state, the vehicle range extender system is in an alternating current charging state, and the ACDC circuit is used for rectifying and outputting received alternating current power to a battery pack of a vehicle.

2. The range extender system for a vehicle according to claim 1, characterized by, when the first switch unit is in a closed state and the second switch unit is in an open state, the vehicle range extender system works in a range extending power generation state, and the ACDC circuit is used for providing a control voltage to the three-phase winding of the generator, so as to control the rotation of the generator and a range extending engine mechanically connected with the generator, and rectify and output alternating current power generated by the rotation of the range extending engine and the generator to the battery pack of the vehicle.

3. The range extender system of claim 1, wherein, the ACDC circuit comprises three-phase parallel full-bridge switch units, and each phase of the full-bridge switch units comprises two first switch tubes in series.

4. The range extender system of claim 3, wherein, the first switch unit comprises three first switch relays, and each phase of the three-phase winding of the generator is connected with the connection position of two first switch tubes in one phase of the full-bridge switch units through one first switch relay.

5. The range extender system of claim 3, wherein, the second switch unit comprises two second switch relays, the on-board charging unit comprises an alternating current charging socket, the alternating current charging socket comprises one phase of a live wire and one phase of a zero line, and one phase of the live wire and one phase of the zero line of the alternating current charging socket are connected with the connection position of two first switch tubes in one phase of the full-bridge switch units through one second switch relay.

6. The range extender system of claim 5, wherein, one inductor is connected in series between one phase of the live wire and one phase of the zero line of the alternating current charging socket and the corresponding second switch relay.

7. The range extender system of claim 3, wherein, the ACDC circuit further comprises a chopper unit connected in parallel with the three-phase full-bridge switch units, the chopper unit comprises a chopper element and a capacitor in parallel, and the chopper element comprises one second switch tube and one first diode in series; the generator further comprises an excitation coil, one end of the excitation coil of the generator is connected with the connection position of one second switch tube and one first diode of the chopper element; the chopper unit is connected in parallel with a third switch unit, and the third switch unit comprises a third switch relay and a fourth switch relay in series; the other end of the excitation coil of the generator is connected with the connection position of the third switch relay and the fourth switch relay of the third switch unit.

8. The range extender system of claim 7, wherein, The high-voltage pre-charging module has one end connected with a first end point, and the first end point is a common connection point of one end of the capacitor, one end of the second switch tube away from the first diode, and one end of the three-phase full-bridge switching unit; The other end of the high-voltage pre-charging module is connected with a second end point, and the second end point is a positive electrode of a battery pack, one end of the fourth switching relay away from the third switching relay is also connected with the second end point, and one end of the third switching relay away from the fourth switching relay is connected with a negative electrode of the battery pack; The high-voltage pre-charging module includes a fifth switching relay and a pre-charging unit in parallel, and the pre-charging unit includes a resistor and a third diode in series.

9. A vehicle characterized by comprising: The vehicle includes the vehicle-mounted range-extending system according to any one of claims 1 to 8.

10. A charging method applied to the vehicle of claim 9, characterized in that, The vehicle further includes a battery pack and a vehicle-mounted charging unit, and the method includes: controlling the first switch unit to be in an open state and controlling the second switch unit to be in a closed state, so that the vehicle-mounted range-extending system works in an alternating current charging state; in a case where it is determined that the vehicle-mounted range-extending system works in the alternating current charging state, rectifying the received alternating current power by using the ACDC circuit and charging the battery pack.

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