A method for abnormal current protection and control of new energy vehicles and a high-voltage circuit

Abstract

This invention discloses a current anomaly protection control method and high-voltage circuit for new energy vehicles, belonging to the field of high-voltage circuit anomaly protection. The method involves an excitation fuse connected in series in the high-voltage circuit. The current in the high-voltage circuit is detected to determine if an abnormal current has occurred. When an abnormal current occurs, the vehicle's status is determined. If the vehicle is charging or its speed is less than or equal to V km / h, the excitation fuse is directly opened. If the speed is greater than V km / h, the motor output power is reduced to 0. Simultaneously, the vehicle's steering configuration information is identified. If it is a dual-source steering system, the system switches to low-voltage steering and the excitation fuse is opened. If it is not a dual-source steering system, the system waits until the speed is less than or equal to V km / h before opening the excitation fuse. This method ensures that the high-voltage circuit can be quickly disconnected to protect the load when an abnormal current occurs, without causing additional safety hazards due to loss of control of the new energy vehicle's steering system.

Description

Technical Field

[0001] This invention belongs to the field of abnormal current protection in high-voltage circuits, and in particular relates to a method for abnormal current protection and control of new energy vehicles and a high-voltage circuit. Background Technology

[0002] High-voltage safety is a key concern for new energy vehicles. Currently, electric vehicles commonly use fuses and contactors for high-voltage circuit breaking protection. However, this approach has several drawbacks: fuses are typically used for short-circuit protection, and their overload protection range is not fully covered. Furthermore, fuses cannot be selected to simultaneously provide both overload current surge and short-circuit current protection. In the event of a collision or other safety risks, fuses or contactors may not be able to quickly disconnect the high-voltage circuit. To improve disconnection speed, some vehicles use fuses for high-voltage circuit breaking protection. However, the steering and braking components of new energy vehicles are high-voltage components; therefore, directly cutting off the circuit when an abnormality occurs in the high-voltage circuit poses a safety risk of loss of steering control.

[0003] In summary, existing high-voltage circuit interruption protection has the technical problem that rapidly cutting off the high-voltage circuit can lead to a safety hazard of loss of steering control. Summary of the Invention

[0004] The purpose of this invention is to provide a current abnormality protection and control method and a high-voltage circuit for new energy vehicles, so as to solve the technical problem that the rapid disconnection of the high-voltage circuit in the prior art will lead to the safety hazard of loss of steering control.

[0005] To achieve the above objectives, the present invention provides a method for abnormal current protection and control of new energy vehicles, and a technical solution for a high-voltage circuit:

[0006] A current anomaly protection control method for new energy vehicles detects the current in the high-voltage circuit to determine if an abnormal current has occurred. When an abnormal current occurs, the vehicle's status is determined. If the vehicle is charging or its speed is less than or equal to V km / h, the excitation fuse is directly opened. If the vehicle speed is greater than V km / h, the motor output power is reduced to 0. Simultaneously, the vehicle's steering configuration information is identified. If the vehicle configuration information indicates a dual-source steering system, the system switches to low-voltage steering and the excitation fuse is opened. If the vehicle configuration information indicates a non-dual-source steering system, the system waits until the vehicle speed is less than or equal to V km / h before opening the excitation fuse.

[0007] The beneficial effects are: compared to traditional fuses, the excitation fuse has the advantages of shorter operating time and faster high-voltage circuit disconnection, effectively improving the circuit's response speed to abnormal currents. This method, after detecting an abnormal current, first assesses the vehicle's state. When the vehicle is stationary or traveling at low speed while charging, disconnecting the high-voltage circuit will not cause serious malfunctions. When the vehicle is traveling at high speed, the output power is first reduced to decrease the vehicle speed. Then, it is determined whether the vehicle has a dual-source steering system. If it does, the vehicle's steering system is adjusted to the low-voltage steering system, and the high-voltage circuit causing the abnormal current is disconnected. If it is not a dual-source system and steering must rely on the high-voltage steering system, the high-voltage circuit is disconnected only after the vehicle speed has decreased to a low level. This ensures that the high-voltage circuit can be quickly disconnected to protect the load when an abnormal current occurs, without causing additional safety hazards due to the loss of control of the steering system in new energy vehicles.

[0008] As a further improvement, the abnormal current judgment method is as follows: when the high-voltage circuit current is greater than the second threshold and less than or equal to the first threshold, it is judged that an abnormal current has occurred; when the high-voltage circuit current is greater than the third threshold and less than or equal to the second threshold, and the duration is greater than or equal to the first set time, it is judged that an abnormal current has occurred; when the high-voltage circuit current is greater than the fourth threshold and less than or equal to the third threshold, and the duration is greater than or equal to the second set time, it is judged that an abnormal current has occurred; the first threshold is greater than the second threshold, greater than the third threshold, and greater than the fourth threshold; the second set time is greater than the first set time.

[0009] The beneficial effects are as follows: First, second, third, and fourth thresholds are set based on the high-voltage circuit load data and short-circuit current magnitude. When the high-voltage circuit current is in a high range, it is immediately identified as an abnormal current. When the high-voltage circuit current is in a high range, the duration of the abnormal current is considered to determine if an abnormal current has occurred. Similarly, when the high-voltage circuit current is in a low range, the duration of the abnormal current is also considered to determine if an abnormal current has occurred. Combining current magnitude and duration in determining whether an abnormal current has occurred makes the anomaly detection more accurate. Since the second set time is longer than the first set time, the higher the abnormal current, the more dangerous it is. Therefore, when the duration of a high abnormal current is relatively short, a rapid judgment of the abnormal current must be made to achieve the effect of quickly protecting the load in the high-voltage circuit.

[0010] As a further improvement, the excitation fuse is set on the main battery circuit, and the detected current is the current in the main battery circuit.

[0011] The beneficial effect is that the high-voltage circuit is the main circuit of the battery, and the current in the main circuit is detected to perform abnormal circuit interruption protection.

[0012] As a further improvement, there are multiple excitation fuses, each set on each battery branch, and the current detected is the current of each battery branch.

[0013] The beneficial effect is that when there are multiple battery branches, the current of each branch can be detected to control the opening and closing protection of each branch individually.

[0014] As a further improvement, when there is an abnormal current in one battery branch and a normal current in another battery branch, the excitation fuse on the abnormal current branch is cut off and the vehicle status is detected. If the vehicle is charging or the vehicle speed is less than or equal to V km / h, the fuse on the main battery circuit is controlled to open. If the vehicle speed is greater than V km / h, the motor output power is reduced to 0 and the system waits until the vehicle speed is less than or equal to V km / h before controlling the fuse on the main battery circuit to open.

[0015] The beneficial effects are: the branches of multiple battery packs are protected by disconnection. When there is an abnormal current in a battery branch and the current in another battery branch is normal, the motor output power is immediately reduced to reduce the vehicle speed and the battery branch with abnormal current is directly disconnected. When the vehicle speed drops to a safe low speed, the main battery circuit is disconnected to prevent abnormal current from damaging the vehicle load.

[0016] As a further improvement, when there is an abnormality in the current of all battery branches, the vehicle status is determined. If the vehicle is in a charging state or the vehicle speed is less than or equal to V km / h, the fuse on the main battery circuit is controlled to open. If the vehicle speed is greater than V km / h, the motor output power is reduced to 0 and the vehicle steering configuration information is identified. If the vehicle configuration information is a dual-source steering system, the low-voltage steering state is switched and the fuse on the main battery circuit is controlled to open. If the vehicle configuration information is a non-dual-source steering system, the fuse on the main battery circuit is controlled to open when the vehicle speed is less than or equal to V km / h.

[0017] The beneficial effect is that when all battery branches are abnormal, the main circuit excitation fuse is opened according to the vehicle status, and the branch circuit excitation fuses do not need to be opened one by one, thus reducing the cost of abnormal current protection.

[0018] A high-voltage circuit for a new energy vehicle includes a main circuit and various load branch circuits. A fuse is installed on the main circuit, and each load branch circuit has a corresponding contactor. The main circuit also includes an excitation fuse and a current sensor. The main circuit includes battery branches and a total battery circuit formed by parallel connections of the battery branches. It also includes a controller connected to the current sensor. The controller acquires current data from the main circuit and determines whether an abnormal current has occurred. When an abnormal current occurs, the controller controls the vehicle based on its current state: if the vehicle is charging or its speed is less than or equal to V km / h, it directly opens the excitation fuse; if the vehicle speed is greater than V km / h, it reduces the motor output power to zero and simultaneously identifies the vehicle's steering configuration information. If the vehicle configuration is a dual-source steering system, it switches to low-voltage steering and opens the excitation fuse; if the vehicle configuration is not a dual-source steering system, it waits until the vehicle speed is less than or equal to V km / h before opening the excitation fuse.

[0019] The beneficial effects are: the high-voltage circuit is equipped with an excitation fuse, which facilitates the controller's rapid control of the high-voltage circuit's opening and closing. The controller also incorporates the vehicle's steering system configuration information when controlling the high-voltage circuit's opening and closing. This achieves both the ability to quickly cut off abnormal current in the high-voltage circuit and ensure the steering safety of new energy vehicles.

[0020] As a further improvement, the controller is also used to detect abnormal currents: when the main circuit current is greater than the second threshold and less than or equal to the first threshold, it is determined that an abnormal current has occurred; when the main circuit current is greater than the third threshold and less than or equal to the second threshold, and the duration is greater than or equal to the first set time, it is determined that an abnormal current has occurred; when the main circuit current is greater than the fourth threshold and less than or equal to the third threshold, and the duration is greater than or equal to the second set time, it is determined that an abnormal current has occurred; the first threshold is greater than the second threshold, greater than the third threshold, and greater than the fourth threshold; the second set time is greater than the first set time.

[0021] The beneficial effect is that the controller combines the current magnitude and duration to determine whether an abnormal current has occurred, making the controller's judgment of abnormal current in the high-voltage circuit more accurate. Since the second set time is longer than the first set time, and the higher the abnormal current, the more dangerous it is, the faster the abnormal current judgment must be made when the duration of a high abnormal current is within a short range, thus achieving the effect of quickly protecting the load in the high-voltage circuit.

[0022] As a further improvement, the excitation fuse is located on the main battery circuit, and the current sensor is also located on the main battery circuit.

[0023] The beneficial effect is that the controller obtains the current of the battery main circuit through the current sensor and performs anomaly judgment to control the opening and closing of the excitation fuse on the battery main circuit.

[0024] As a further improvement, there are multiple excitation fuses, each set on each battery branch. Current sensors are set on each battery branch. The controller is also used to cut off the excitation fuse on the branch with abnormal current and detect the vehicle status when there is an abnormal current in one battery branch and the current in another battery branch is normal. It is also used to control the fuse on the main battery circuit to open if the vehicle is charging or the vehicle speed is less than or equal to V km / h. If the vehicle speed is greater than V km / h, it controls the motor output power to drop to 0 and waits until the vehicle speed is less than or equal to V km / h before controlling the fuse on the main battery circuit to open.

[0025] The beneficial effect is that by setting up excitation fuses on each battery branch, the controller can perform personalized interruption protection when there is an abnormal current in one battery branch and a normal current in another. Attached Figure Description

[0026] Figure 1 This is a circuit diagram of Embodiment 1 of the high-voltage circuit for new energy vehicles in this invention;

[0027] Figure 2 This is a circuit diagram of two battery branches in Embodiment 2 of the high-voltage circuit for new energy vehicles in this invention;

[0028] Figure 3 The flowchart of the current abnormality protection and control method for new energy vehicles of the present invention is as follows. Figure 1 ;

[0029] Figure 4 This is a flowchart of the abnormal current judgment in the abnormal current protection control method for new energy vehicles of the present invention;

[0030] Figure 5 This is a flowchart illustrating the controller's judgment of abnormal current in Embodiment 1 of the high-voltage circuit for new energy vehicles in this invention;

[0031] Figure 6 This is a flowchart illustrating the controller's judgment of abnormal current in Embodiment 2 of the high-voltage circuit for new energy vehicles in this invention;

[0032] Figure 7 This is a control flowchart of Embodiment 1 of the high-voltage circuit for new energy vehicles in this invention;

[0033] Figure 8 This is a control flowchart of Embodiment 2 of the high-voltage circuit for new energy vehicles in this invention;

[0034] Figure 9 This is a circuit diagram of the four battery branches in Embodiment 2 of the high-voltage circuit for new energy vehicles in this invention. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only for explaining the invention and are not intended to limit the invention; that is, the described embodiments are merely some embodiments of the invention, not all embodiments. The components of the embodiments of the invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0036] Example 1 of high-voltage circuit for new energy vehicles:

[0037] The high-voltage circuit of a new energy vehicle includes a main circuit and various load branch circuits. A fuse is installed on the main circuit, and each load branch circuit has a corresponding contactor. The main circuit also includes an excitation fuse and a current sensor. The main circuit includes battery branches and a total battery circuit formed by parallel connections of these battery branches. The fuse is located on the main circuit. Figure 1 , Figure 7 As shown, in this embodiment, the battery branches are four connected in parallel to form one main battery circuit. The main battery circuit is equipped with an excitation fuse 1 and a main circuit fuse FUSE0. The excitation fuse 1 is located on the positive terminal circuit, and the main circuit fuse FUSE0 is located on the negative terminal circuit. Current sensors 1, 2, 3, and 4 are respectively installed on the four battery branches. Since the loads include motor 1, motor 2, steering motor, air compressor, 24V battery, and air conditioner, the corresponding branch circuits include motor 1 circuit, motor 2 circuit, steering motor circuit, air compressor circuit, 24V battery circuit, and air conditioner circuit. Each load branch circuit is also equipped with current sensors, fuses, and contactors as needed. For example, the steering motor circuit is equipped with fuses FUSE1 and FUSE2, current sensors CS11, CS12, and CS13. In this embodiment, some load circuits do not have contactors. Figure 1 The bid was successful.

[0038] The high-voltage circuit also includes a controller connected to a current sensor on the battery branch. The controller calculates the current in the overall battery circuit. Based on the calculated current, an abnormal current detection method is used to determine if an abnormal current has occurred. This controller can be a standalone controller or integrated into the main circuit fuse FUSE0 as a single component.

[0039] When an abnormal current occurs, the controller determines the vehicle's status. If the vehicle is charging or the vehicle speed is less than or equal to V km / h, it indicates that the abnormality in the steering system will not affect driving safety. The controller then controls the excitation fuse 1 of the battery main circuit to open.

[0040] If the vehicle speed exceeds V km / h, directly disconnecting the battery main circuit could cause a steering system malfunction, affecting the vehicle at high speeds and potentially leading to a more serious safety accident. Therefore, the controller controls the main drive motor controller to reduce the motor output power to zero, while simultaneously identifying the vehicle's steering configuration information. Regardless of whether the vehicle has a dual-source steering system, it is essential to reduce the vehicle speed as quickly as possible to ensure driving safety.

[0041] If the vehicle configuration information indicates a dual-source steering system, the controller controls the steering system to switch to low-voltage steering mode and controls the excitation fuse 1 of the battery main circuit to open. After the steering system switches to the low-voltage control system, cutting off the high-voltage circuit does not affect the vehicle's steering function, thus cutting off the high-voltage power supply to the battery.

[0042] If the vehicle configuration information is not a dual-source steering system, the excitation fuse 1 of the battery output circuit will be opened when the vehicle speed is less than or equal to Vkm / h.

[0043] Preferably, Vkm / h = 5km / h here.

[0044] like Figure 5 The abnormal current detection method in the controller is shown.

[0045] An abnormal current is identified when the total battery output current is greater than the second threshold but less than or equal to the first threshold; an abnormal current is identified when the total battery output current is greater than the third threshold but less than or equal to the second threshold, and the duration is greater than or equal to the first set time; an abnormal current is identified when the total battery output current is greater than the fourth threshold but less than or equal to the third threshold, and the duration is greater than or equal to the second set time. The second set time is greater than the first set time.

[0046] In this embodiment, the first threshold is 2500A, the second threshold is 1500A, the third threshold is 1000A, and the fourth threshold is 700A; the preferred second setting time is 20s, and the first setting time is 2s. This high-voltage circuit ensures that it can quickly disconnect the high-voltage circuit to protect the load when an abnormal current occurs, while also ensuring that no additional safety hazards arise due to the loss of control of the steering system of new energy vehicles. The above thresholds are determined by combining the current-time characteristics of each component of the high-voltage circuit, ensuring that the high-voltage circuit can be safely disconnected in time before thermal runaway occurs, avoiding greater safety risks.

[0047] Example 2 of high-voltage circuit for new energy vehicles:

[0048] like Figure 2 The circuit diagrams of the two battery branches shown are as follows: Figure 9 The circuit diagram of the four battery branches shown. Figure 8The control flowchart shown indicates that, compared with Example 1, the excitation fuse of this new energy vehicle high-voltage circuit is set on the battery branch, and the main circuit fuse FUSE0 is set on the battery main circuit.

[0049] like Figure 6 As shown, the method for judging abnormal current is the same as in Embodiment 1, the difference being that the abnormality judgment object in this embodiment is the battery branch. Therefore, the threshold values ​​used for judging the current of the battery branch and the current of the battery main circuit are different. Taking two battery branches as an example, when judging the abnormality of the battery main circuit, the first threshold is 1250A, the second threshold is 700A, the third threshold is 500A, and the fourth threshold is 350A. For the two battery branches in this embodiment, each current threshold is halved. That is, when the battery branch consists of N branches of the same battery pack, the above four thresholds are reduced by a factor of N.

[0050] When an abnormal current occurs in the circuit, the controller will control the circuit to open. The control needs to be adjusted according to the situation. If all battery branches are abnormal, the controller will detect the vehicle status. If the vehicle is charging or the vehicle speed is less than or equal to V km / h, the controller will control the main circuit fuse FUSE0 on the main battery circuit to open. If the vehicle speed is greater than V km / h, the controller will control the main drive motor controller to reduce the motor output power to 0, and at the same time identify the vehicle steering configuration information.

[0051] If the vehicle configuration information indicates a dual-source steering system, the controller controls the steering system to switch to low-voltage steering mode and opens the main circuit fuse FUSE0 on the battery main circuit. After the steering system switches to the low-voltage control system, cutting off the high-voltage circuit does not affect the vehicle's steering function, thus allowing the high-voltage power supply to the battery to be cut off.

[0052] If the vehicle configuration information is not a dual-source steering system, the main circuit fuse FUSE0 on the main circuit of the battery will be opened when the vehicle speed is less than or equal to Vkm / h.

[0053] If one battery branch experiences an abnormal current while the other is normal, the controller directly trips the fuse of the battery branch with the abnormal current. Although another battery branch can still provide power, the power supply should be cut off as soon as possible, and the vehicle should be stopped to check for other faults. After disconnecting the abnormal battery branch, the controller operates similarly to the control method in Example 1. It first determines the vehicle's status. If the vehicle speed is low or it is charging, it directly trips the main circuit fuse of the battery main circuit. If the vehicle speed is high, it reduces the speed by controlling the motor output. Once the speed drops to V km / h, the controller trips the main circuit fuse of the battery main circuit. Everything else is the same as in Example 1.

[0054] Example of an abnormal current protection control method for new energy vehicles:

[0055] like Figure 3 The current abnormality protection control method for new energy vehicles shown includes an excitation fuse connected in series in the high-voltage circuit. The current in the high-voltage circuit is detected to determine if an abnormal current has occurred. When an abnormal current occurs, the vehicle's status is determined. If the vehicle is charging or its speed is less than or equal to V km / h, the excitation fuse is directly opened. If the vehicle speed is greater than V km / h, the motor output power is reduced to 0, and the vehicle's steering configuration information is identified. If the vehicle configuration is a dual-source steering system, the system switches to low-voltage steering and the excitation fuse is opened. If the vehicle configuration is not a dual-source steering system, the system waits until the vehicle speed is less than or equal to V km / h before opening the excitation fuse.

[0056] like Figure 4 The abnormal current judgment method is as follows: when the high-voltage circuit current is greater than the second threshold and less than or equal to the first threshold, it is judged that an abnormal current has occurred; when the high-voltage circuit current is greater than the third threshold and less than or equal to the second threshold, and the duration is greater than or equal to the first set time, it is judged that an abnormal current has occurred; when the high-voltage circuit current is greater than the fourth threshold and less than or equal to the third threshold, and the duration is greater than or equal to the second set time, it is judged that an abnormal current has occurred; the first threshold is greater than the second threshold, greater than the third threshold, and greater than the fourth threshold; the second set time is greater than the first set time.

[0057] The excitation fuse is set on the main battery circuit, and the detected current is the current in the main battery circuit.

[0058] There are multiple excitation fuses, each installed on each battery branch, and the current detected is the current of each battery branch.

[0059] When there is an abnormal current in one battery branch and a normal current in another battery branch, the excitation fuse on the branch with the abnormal current is cut off and the vehicle status is detected. If the vehicle is charging or the vehicle speed is less than or equal to V km / h, the fuse on the main battery circuit is controlled to open. If the vehicle speed is greater than V km / h, the motor output power is reduced to 0 and the system waits until the vehicle speed is less than or equal to V km / h before controlling the fuse on the main battery circuit to open.

[0060] When the current in all battery branches is abnormal, the vehicle status is determined. If the vehicle is charging or the vehicle speed is less than or equal to V km / h, the fuse in the main battery circuit is opened. If the vehicle speed is greater than V km / h, the motor output power is reduced to 0, and the vehicle steering configuration information is identified. If the vehicle configuration information indicates a dual-source steering system, the low-voltage steering state is switched, and the fuse in the main battery circuit is opened. If the vehicle configuration information indicates a non-dual-source steering system, the fuse in the main battery circuit is opened only when the vehicle speed is less than or equal to V km / h. This implementation method refers to Embodiments 1 and 2 of the high-voltage circuit for new energy vehicles, and will not be repeated here.

[0061] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still make modifications to the technical solutions described in the foregoing embodiments without creative effort, or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A new energy vehicle current abnormal protection control method, characterized in that, The excitation fuse is arranged in series on the high-voltage loop; The current on the high-voltage loop is detected to determine whether abnormal current occurs, and when abnormal current occurs, the state of the vehicle is determined; if the vehicle is in a charging state or the vehicle speed is less than or equal to Vkm / h, the excitation fuse is controlled to be directly opened; if the vehicle speed is greater than Vkm / h, the motor output power is controlled to be reduced to 0, and the configuration information of the vehicle steering is identified; if the vehicle configuration information is a dual-source steering system, the low-voltage steering state is switched to and the excitation fuse is controlled to be opened; if the vehicle configuration information is a non-dual-source steering system, the excitation fuse is controlled to be opened when the vehicle speed is less than or equal to Vkm / h; The abnormal current determination method is as follows: when the high-voltage loop current is greater than the second threshold value and less than or equal to the first threshold value, it is determined that abnormal current occurs; when the high-voltage loop current is greater than the third threshold value and less than or equal to the second threshold value, and the duration is greater than or equal to the first set time, it is determined that abnormal current occurs; when the high-voltage loop current is greater than the fourth threshold value and less than or equal to the third threshold value, and the duration is greater than or equal to the second set time, it is determined that abnormal current occurs; the first threshold value is greater than the second threshold value, which is greater than the third threshold value, which is greater than the fourth threshold value, and the second set time is greater than the first set time.

2. The new energy vehicle current abnormal protection control method according to claim 1, characterized in that, The excitation fuse is arranged on the battery main loop, and the detected current is the current on the battery main loop.

3. The new energy vehicle current abnormal protection control method according to claim 1, characterized in that, The excitation fuse is arranged on the battery main loop, and the detected current is the current on the battery main loop.

4. The new energy vehicle current abnormal protection control method according to claim 3, characterized in that, When there is abnormal current on a battery branch and normal current on another battery branch, the excitation fuse on the current abnormal branch is cut off, and the state of the vehicle is detected; if the vehicle is in a charging state or the vehicle speed is less than or equal to Vkm / h, the fuse on the battery main loop is controlled to be opened; if the vehicle speed is greater than Vkm / h, the motor output power is controlled to be reduced to 0, and the vehicle speed is waited to be less than or equal to Vkm / h, and the fuse on the battery main loop is controlled to be opened.

5. The new energy vehicle current abnormal protection control method according to claim 3, characterized in that, When all the currents on the battery branches are abnormal, the state of the vehicle is determined; if the vehicle is in a charging state or the vehicle speed is less than or equal to Vkm / h, the fuse on the battery main loop is controlled to be opened; if the vehicle speed is greater than Vkm / h, the motor output power is controlled to be reduced to 0, and the configuration information of the vehicle steering is identified; if the vehicle configuration information is a dual-source steering system, the low-voltage steering state is switched to and the fuse on the battery main loop is controlled to be opened; if the vehicle configuration information is a non-dual-source steering system, the fuse on the battery main loop is controlled to be opened when the vehicle speed is less than or equal to Vkm / h.

6. A new energy vehicle high-voltage loop, comprising a main loop and load branch loops, a fuse is arranged on the main loop, and each load branch loop is provided with a corresponding contactor, characterized in that, The excitation fuse and the current sensor are further arranged on the main loop, and the main loop includes the battery branch and the battery main loop parallelly connected by the battery branch. The incentive fuse comprises a controller connected with a current sensor; the controller acquires current data on the main circuit, and determines that abnormal current occurs when the current on the main circuit is greater than a second threshold and less than or equal to a first threshold; determines that abnormal current occurs when the current on the main circuit is greater than a third threshold and less than or equal to the second threshold, and the duration is greater than or equal to a first set time; determines that abnormal current occurs when the current on the main circuit is greater than a fourth threshold and less than or equal to the third threshold, and the duration is greater than or equal to a second set time; the first threshold is greater than the second threshold, the second threshold is greater than the third threshold, and the third threshold is greater than the fourth threshold; the second set time is greater than the first set time. The controller is further configured to control the incentive fuse to open when abnormal current occurs according to the state of the vehicle: if the vehicle is in a charging state or the vehicle speed is less than or equal to Vkm / h, the incentive fuse is controlled to open; if the vehicle speed is greater than Vkm / h, the motor output power is controlled to be reduced to 0, and the configuration information of the vehicle steering is identified; if the vehicle configuration information is a dual-source steering system, the vehicle is switched to a low-voltage steering state and the incentive fuse is controlled to open; if the vehicle configuration information is a non-dual-source steering system, the vehicle waits until the vehicle speed is less than or equal to Vkm / h, and then the incentive fuse is controlled to open.

7. The new energy vehicle high-voltage loop according to claim 6, characterized in that, The incentive fuse is arranged on the battery main circuit, and the current sensor is arranged on the battery main circuit.

8. The new energy vehicle high-voltage loop according to claim 6, characterized in that, The incentive fuse is arranged on the battery main circuit, and the current sensor is arranged on the battery main circuit. The incentive fuse is arranged on the battery main circuit, and the current sensor is arranged on the battery main circuit.

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