A control system and control method for limiting the maximum speed of a pure electric bus

Abstract

The application provides a control system and a control method for the maximum limited speed of a pure electric bus, and relates to the technical field of vehicle control.The existing pure electric bus generally changes the speed limit by field writing of a speed limiting device program, and the service cost is too high.Even if the instrument is adjusted, the speed fluctuation is large during the speed limiting process, it is difficult to keep in an accurate range, the working difficulty of the driver is increased, and the comfort of the bus is affected.The system comprises an instrument and a speed limiting device, the speed limiting device comprises a vehicle controller, the maximum limited speed value is changed through the instrument interface, the instrument sends to the vehicle controller through a CAN bus, the vehicle controller responds to the maximum limited speed request sent by the instrument according to a judgment strategy, and the actual maximum limited speed is obtained.The application reduces the service cost, makes the pure electric bus adapt to different running maximum speed limit environments, and meets the stable running of the pure electric bus in different running environments.

Description

Technical Field

[0001] This invention belongs to the field of vehicle control technology, and in particular relates to a control system and control method for the maximum speed limit of a pure electric bus. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] With the booming development of new energy vehicles, pure electric buses, as a type of new energy vehicle, have advantages such as energy saving, environmental protection, and low noise, and are gradually being applied to urban transportation. However, due to the relatively short time that pure electric buses have been in use, they face many technical challenges.

[0004] Because pure electric buses need to operate in different environments, their maximum speed limits vary. Different maximum speed limits must be selected for different work scenarios and road conditions to meet operational needs. Currently, the speed limiting device for pure electric buses is generally a vehicle controller, and changing the maximum speed limit is achieved by reprogramming the speed limiting device. For example, pure electric buses exported overseas have their speed limits changed through on-site reprogramming, which is relatively expensive in terms of both economy and time. Furthermore, the time required for program modification increases service costs.

[0005] Furthermore, although methods for adjusting the maximum speed limit via the instrument panel have emerged, such as the vehicle speed limit setting method, system, computer equipment, storage medium, and vehicle in patent CN 118617995A, a maximum speed limit value has been obtained. However, the response strategy of the vehicle controller has not been considered. During the speed limiting process, the vehicle speed fluctuates greatly, making it difficult to maintain within an accurate range. This increases the workload of the driver and affects the comfort of the bus. At the same time, each adjustment directly replaces the previous maximum speed limit. When the same working scenario is run again, it is necessary to make judgments and adjustments again, which increases the time cost. The method of adjusting the maximum speed limit cannot meet the stable operation of pure electric buses in different operating environments. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, this invention provides a control system and method for the maximum speed limit of a pure electric bus. The maximum speed limit is adjusted via an instrument panel and sent to the vehicle controller. The vehicle controller parses the maximum speed limit message and, according to a response strategy, sends the adjusted maximum speed limit back to the instrument panel. The instrument panel then displays and stores the maximum speed limit response from the vehicle controller. This allows the pure electric bus to maintain a precise speed limit during the speed limiting process, reducing service costs, lessening driver workload, and improving bus operation stability and comfort.

[0007] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions:

[0008] Firstly, a control system for the maximum speed limit of a pure electric bus is disclosed, including:

[0009] Instruments and speed limiters;

[0010] The speed limiting device includes a vehicle controller;

[0011] The instrument receives the set maximum speed limit and sends a maximum speed limit request to the vehicle controller;

[0012] The vehicle controller responds to the maximum speed limit request by determining the actual maximum speed limit based on a judgment strategy.

[0013] The decision-making strategy of the vehicle controller is as follows:

[0014] The vehicle controller sets a fixed upper limit and a fixed lower limit for the maximum vehicle speed, and the vehicle speed limit responded by the vehicle controller does not exceed the upper limit and the lower limit for the maximum vehicle speed.

[0015] If the maximum speed limit requested after instrument adjustment is less than the fixed lower limit of the maximum speed limit, then the fixed lower limit of the maximum speed limit will be used as the maximum speed limit. Otherwise, the maximum speed limit requested after instrument adjustment will be compared with the fixed upper limit of the maximum speed limit.

[0016] If the requested maximum speed limit after instrument adjustment is greater than the fixed value of the maximum speed limit, the fixed value of the maximum speed limit will be used as the actual maximum speed limit. Otherwise, the maximum speed limit after instrument adjustment will be used as the actual maximum speed limit.

[0017] As a further technical solution, the instrument includes a processor and an instrument panel interface;

[0018] The dashboard interface is used to adjust the maximum speed limit value and display the maximum speed limit.

[0019] The processor is used to send the adjusted maximum speed limit request message to the vehicle controller, and at the same time, receive the actual maximum speed limit response sent by the vehicle controller and store the actual maximum speed limit.

[0020] As a further technical solution, the instrument and vehicle controller communicate via a CAN bus.

[0021] As a further technical solution, the instrument panel interface is provided with a maximum speed limit sub-interface. In the maximum speed limit sub-interface, the values ​​on the instrument panel interface can be adjusted by pressing the + / - buttons. The minimum adjustment value is 1 km / h. Pressing the '+' button increases the speed by 1 km / h, and pressing the '-' button decreases the speed by 1 km / h. The adjusted value is displayed on the interface. After adjustment, press the confirmation button.

[0022] The second aspect discloses a pure electric bus, including a control system for the maximum speed limit of the pure electric bus, an accelerator pedal, a motor controller, and a motor;

[0023] The control system receives the voltage signal sent by the accelerator pedal, parses the current accelerator pedal opening percentage, reads the CAN message sent by the motor controller, parses the current motor speed value, calculates the current driving torque based on the current motor speed value and the accelerator pedal opening percentage, and controls the vehicle's maximum speed limit by limiting the driving torque.

[0024] Thirdly, a method for controlling the maximum speed limit of a pure electric bus is disclosed, including:

[0025] Obtain the start signal and read the memory value stored after the start power is turned off as the current maximum speed limit;

[0026] Adjust the current maximum speed limit and send the adjusted maximum speed limit to the vehicle controller in the form of a request message;

[0027] The vehicle controller responds to the received maximum speed limit request according to the judgment strategy, obtains the actual maximum speed limit, and sends it to the instrument panel for display and storage.

[0028] As a further technical solution, it also includes: when the vehicle controller performs speed limiting operation, it obtains the current vehicle speed; when the current vehicle speed reaches the maximum speed limit, the drive power is at its lowest and the current vehicle speed no longer increases; when the current drive power is the maximum drive power, the speed limiting is completed.

[0029] As a further technical solution, the judgment strategy of the vehicle controller is that the vehicle controller sets a fixed upper limit value and a fixed lower limit value for the maximum vehicle speed, and the vehicle speed limit responded by the vehicle controller does not exceed the upper limit value and the lower limit value for the maximum vehicle speed.

[0030] If the maximum speed limit requested after instrument adjustment is less than the fixed lower limit of the maximum speed limit, then the fixed lower limit of the maximum speed limit will be used as the maximum speed limit. Otherwise, the maximum speed limit requested after instrument adjustment will be compared with the fixed upper limit of the maximum speed limit.

[0031] If the requested maximum speed limit after instrument adjustment is greater than the fixed value of the maximum speed limit, the fixed value of the maximum speed limit will be used as the actual maximum speed limit. Otherwise, the maximum speed limit after instrument adjustment will be used as the actual maximum speed limit.

[0032] As a further technical solution, the current maximum speed limit can be adjusted as follows: In the instrument panel's maximum speed limit sub-interface, the value on the instrument panel can be adjusted by pressing the + / - buttons. The minimum value is 1 km / h. Press the '+' button to increase the speed by 1 km / h, and press the '-' button to decrease the speed by 1 km / h. The adjusted value is displayed on the interface. After adjustment, press the confirmation button.

[0033] As a further technical solution, the maximum driving power at the current vehicle speed is calculated using the following formula:

[0034] P_current_max=P_max-K×(V-V1);

[0035] Where P_max represents the maximum available power of the drive system, K represents the adjustment ratio, V1 is the initial speed of the pure electric bus when entering the speed limit adjustment, and V represents the current speed.

[0036] The above one or more technical solutions have the following beneficial effects:

[0037] In this embodiment, the maximum speed limit system adjusts the maximum speed limit vehicle speed through the instrument panel, and the vehicle controller responds and controls according to the strategy. It also implements operations such as speed limit on the pure electric bus through the accelerator pedal. It does not require on-site rewriting of the speed limit device program to achieve the maximum speed limit, which can reduce service costs and enable the pure electric bus to adapt to different operating maximum speed limit environments.

[0038] In this embodiment, the response of the vehicle controller enables the pure electric bus to maintain a precise speed limit, reducing the driver's workload and improving the stability and comfort of the pure electric bus. At the same time, each adjustment is performed based on the previous maximum speed limit and is stored. When the previous working scenario is run again, there is no need to make judgments and adjustments again, reducing time costs and ensuring the stable operation of the pure electric bus in different operating environments.

[0039] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0040] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0041] Figure 1 This is a block diagram illustrating the control system principle of the maximum speed limit of a pure electric bus in Embodiment 1.

[0042] Figure 2 This is a flowchart of a method for controlling the maximum speed limit of a pure electric bus in Embodiment 3. Detailed Implementation

[0043] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0044] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations of the present invention.

[0045] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0046] Example 1

[0047] This embodiment discloses a control system for the maximum speed limit of a pure electric bus, including:

[0048] Instruments and speed limiters;

[0049] The speed limiting device includes a vehicle controller;

[0050] The instrument receives the set maximum speed limit and sends a maximum speed limit request to the vehicle controller;

[0051] The vehicle controller responds to the maximum speed limit request by determining the actual maximum speed limit based on a judgment strategy.

[0052] The decision-making strategy of the vehicle controller is as follows:

[0053] The vehicle controller sets a fixed upper limit and a fixed lower limit for the maximum vehicle speed, and the vehicle speed limit responded by the vehicle controller does not exceed the upper limit and the lower limit for the maximum vehicle speed.

[0054] If the maximum speed limit requested after instrument adjustment is less than the fixed lower limit of the maximum speed limit, then the fixed lower limit of the maximum speed limit will be used as the maximum speed limit. Otherwise, the maximum speed limit requested after instrument adjustment will be compared with the fixed upper limit of the maximum speed limit.

[0055] If the requested maximum speed limit after instrument adjustment is greater than the fixed value of the maximum speed limit, the fixed value of the maximum speed limit will be used as the actual maximum speed limit. Otherwise, the maximum speed limit after instrument adjustment will be used as the actual maximum speed limit.

[0056] Currently, pure electric buses are widely used. Since pure electric buses need to operate in different operating environments, the requirements for maximum speed limit vary. When encountering different working scenarios and different road conditions, different maximum speed limits need to be selected to meet the needs of vehicle use. For example, pure electric buses exported overseas need to provide a control system for maximum speed limit.

[0057] In this embodiment, the instrument includes a processor and an instrument panel interface;

[0058] The dashboard interface is used to adjust the maximum speed limit value and display the maximum speed limit.

[0059] The processor is used to send the adjusted maximum speed limit request message to the vehicle controller.

[0060] Simultaneously, it receives the actual maximum speed limit response sent by the vehicle controller and stores the actual maximum speed limit.

[0061] In this embodiment, the instrument panel interface has a maximum speed limit sub-interface. In the maximum speed limit sub-interface of the instrument panel, the stored maximum speed limit is called and adjusted to obtain the adjusted maximum speed limit. The adjusted maximum speed limit is then sent to the vehicle controller in the form of a request message.

[0062] Before adjusting the instrument panel, first check if there is an ON position signal. If not, activate the ON position, then retrieve the previous maximum speed limit from the instrument panel and adjust it accordingly.

[0063] Instrument adjustment method: Each adjustment uses the previously stored maximum speed limit as the current maximum speed limit. The instrument displays the current maximum speed limit in the maximum speed limit sub-interface. Adjust the values ​​on the instrument panel using the + / - buttons. The minimum adjustment value is 1 km / h. Press the '+' button to increase the speed limit by 1 km / h, and press the '-' button to decrease the speed limit by 1 km / h. The adjusted value is displayed on the interface. Press the confirmation button after adjustment.

[0064] like Figure 1 As shown, the instrument cluster and vehicle controller communicate via the CAN bus.

[0065] The adjusted maximum speed limit is sent to the CAN bus in real time in the form of a message and synchronized for display on the instrument interface. The vehicle control unit analyzes the maximum speed limit message to control the maximum speed limit of the vehicle and sends the adjusted maximum speed limit after response to the CAN bus. The instrument analyzes the maximum speed limit responded by the vehicle control unit for display.

[0066] As Figure 1 shown, the vehicle control unit obtains the actual maximum speed limit response based on the judgment strategy for the maximum speed limit request.

[0067] The judgment strategy of the vehicle control unit is that the vehicle control unit sets the fixed value of the maximum speed limit upper limit and the fixed value of the maximum speed limit lower limit, and the restricted speed responded by the vehicle control unit does not exceed the maximum speed limit upper limit and the maximum speed limit lower limit; when the maximum speed limit requested after the instrument adjustment is less than the fixed value of the maximum speed limit lower limit, the fixed value of the maximum speed limit lower limit is used as the maximum speed limit, otherwise, the maximum speed limit requested after the instrument adjustment is compared with the fixed value of the maximum speed limit upper limit; when the maximum speed limit requested after the instrument adjustment is greater than the fixed value of the maximum speed limit upper limit, the fixed value of the maximum speed limit upper limit is used as the actual maximum speed limit, otherwise, the maximum speed limit after the instrument adjustment is used as the actual maximum speed limit.

[0068] Specifically: Let the maximum speed limit be V_max, and after sending the maximum speed limit V_set adjusted by the instrument to the vehicle control unit, it is compared and judged with the fixed value of the maximum speed limit upper limit V_high and the fixed value of the maximum speed limit lower limit V_low set by the vehicle control unit.

[0069] First, make the first comparison between V_max and the fixed value of the maximum speed limit lower limit V_low.

[0070] When V_set < V_low, then V_max = V_low, and V_low is the maximum speed limit.

[0071] When V_set ≥ V_low, then V_max = V_set, and make the second comparison between V_set and the fixed value of the maximum speed limit upper limit V_high set by the vehicle control unit.

[0072] When V_set > V_high, then V_max = V_high, and V_high is the maximum speed limit.

[0073] When V_set ≤ V_high, then V_max = V_set, and V_set is the maximum speed limit.

[0074] After two comparisons, the final V_max is obtained. Press the confirmation button and update the current maximum speed limit value to V_max.

[0075] Finally, after the vehicle is switched off, the instrument panel stores the current maximum speed limit value V_max. The next time the vehicle is switched on, the stored value V_max will be read as the maximum speed limit for this operation.

[0076] In this embodiment, after the maximum speed limit is obtained through the control system, the vehicle controller performs a speed limit operation based on the current maximum speed limit requirement.

[0077] The driver or safety personnel transmit the accelerator pedal's opening degree as a voltage signal to the vehicle controller by operating the accelerator pedal. The vehicle controller receives the voltage signal from the accelerator pedal and parses the current accelerator pedal opening percentage. The vehicle controller reads the CAN message sent by the motor controller and parses the current motor speed value. Based on the current motor speed value and the accelerator pedal opening percentage, the vehicle controller calculates the current drive torque value T1, compares it with the current maximum limit drive torque T_current_max, takes the minimum value, and outputs the final drive torque T2. The maximum vehicle speed is limited in this way.

[0078] Example 2

[0079] This embodiment provides a pure electric bus, including a control system for the maximum speed limit of the pure electric bus, an accelerator pedal, a motor controller, and a motor.

[0080] The control system receives the voltage signal sent by the accelerator pedal, parses the current accelerator pedal opening percentage, reads the CAN message sent by the motor controller, parses the current motor speed value, calculates the current driving torque based on the current motor speed value and the accelerator pedal opening percentage, and controls the vehicle's maximum speed limit by limiting the driving torque.

[0081] The control system for the maximum speed limit of a pure electric bus in this embodiment is the same as the control system for the maximum speed limit of a pure electric bus in Embodiment 1.

[0082] Example 3

[0083] The purpose of this embodiment is to provide a method for controlling the maximum speed limit of a pure electric bus, including:

[0084] S1. Obtain the start signal and read the memory value stored after the start power is turned off as the current maximum speed limit;

[0085] S2. Adjust the current maximum speed limit and send the adjusted maximum speed limit to the vehicle controller in the form of a request message;

[0086] S3. The vehicle controller responds to the received maximum speed limit request according to the judgment strategy, obtains the maximum speed limit, and sends it to the instrument panel for display and storage.

[0087] like Figure 2 As shown, in step S1, the start gear signal is obtained, and the previously stored memory value is read as the current maximum speed limit.

[0088] First, check if there is an ON position signal. If not, activate the ON position. Then, the instrument panel reads and displays the previous maximum speed limit as the current maximum speed limit.

[0089] like Figure 2 As shown, in step S2, the current maximum speed limit is adjusted, and the adjusted maximum speed limit is sent to the vehicle controller in the form of a request message.

[0090] S201, Adjust the current maximum speed limit.

[0091] Each adjustment uses the previous maximum speed limit as the current maximum speed limit. The instrument panel displays the current maximum speed limit in the maximum speed limit sub-interface. Adjust the value on the instrument panel using the + / - buttons. The minimum adjustment value is 1 km / h. Press the '+' button to increase the speed limit by 1 km / h, and press the '-' button to decrease the speed limit by 1 km / h. The adjusted value is displayed on the interface. After adjustment, press the confirmation button, and the adjusted maximum speed limit V_set will be displayed on the instrument panel.

[0092] S202. The adjusted maximum speed limit is sent to the vehicle controller as a request message. The maximum speed limit V_set adjusted by the instrument panel is sent to the CAN bus in real time as a request message, and then synchronously sent to the vehicle controller via the CAN bus.

[0093] like Figure 2 As shown, in step S3, the vehicle controller responds to the received maximum speed limit request after instrument adjustment according to the judgment strategy, obtains the maximum speed limit, and sends it to the instrument for display and storage.

[0094] S301. The vehicle controller responds to the received request for the maximum speed limit after instrument adjustment according to the judgment strategy, and obtains the maximum speed limit.

[0095] Specifically, set the maximum speed limit as V_max. After sending the adjusted maximum speed limit V_set of the instrument to the vehicle controller, compare and judge it with the fixed upper limit value V_high and the fixed lower limit value V_low of the maximum speed limit set by the vehicle controller.

[0096] First, make the first comparison between V_max and the fixed lower limit value V_low of the maximum speed limit.

[0097] When V_set < V_low, then V_max = V_low, and V_low is the maximum speed limit.

[0098] When V_set ≥ V_low, then V_max = V_set, and make the second comparison between V_set and the fixed upper limit value V_high of the maximum speed limit set by the vehicle controller.

[0099] When V_set > V_high, then V_max = V_high, and V_high is the maximum speed limit.

[0100] When V_set ≤ V_high, then V_max = V_set, and V_set is the maximum speed limit.

[0101] After two judgment and comparison operations, obtain the final V_max, press the confirmation key, and update the current maximum speed limit value to V_max.

[0102] S302. Send the maximum speed limit to the instrument for display and storage.

[0103] Send the maximum speed limit V_max to the instrument. After the vehicle is turned off to the ON gear, the instrument stores the current maximum speed limit value V_max. When the vehicle is turned on to the ON gear next time, read the memory value V_max stored after turning off the ON gear this time as the maximum speed limit for this operation.

[0104] In this embodiment, after obtaining the maximum speed limit through the control system, the vehicle controller performs a speed limit operation according to the current maximum speed limit requirement.

[0105] The driver or safety personnel transmit the accelerator pedal's opening degree as a voltage signal to the vehicle controller by operating the accelerator pedal. The vehicle controller receives the voltage signal from the accelerator pedal and parses the current accelerator pedal opening percentage. The vehicle controller reads the CAN message sent by the motor controller and parses the current motor speed value. Based on the current motor speed value and the accelerator pedal opening percentage, the vehicle controller calculates the current drive torque value T1, compares it with the current maximum limit drive torque T_current_max, takes the minimum value, and outputs the final drive torque T2. The maximum vehicle speed is limited in this way.

[0106] The maximum driving torque T_current_max is calculated using the following formula:

[0107] T_current_max=9550×P_current_max / n_current(1)

[0108] Where n_current represents the current motor speed and P_current_max represents the power of the drive system.

[0109] If T1 > T_current_max, then T2 = T_current_max.

[0110] If T1 ≤ T_current_max, then T2 = T1.

[0111] When the current speed of the pure electric bus reaches V1, it enters the speed limit stage. As the speed gradually increases, the power of the drive system P_current_max is gradually limited. When the maximum speed limit V_max is reached, the drive power of the vehicle is already limited to a low level, and the vehicle no longer accelerates.

[0112] Speed ​​regulation ratio, the formula is:

[0113] K = P_max / ΔV (2)

[0114] V1 = V max -ΔV

[0115] Among them, △V can be calibrated according to the vehicle status, and is generally taken as 7, 8, 9, or 10; V1 is the initial speed of the pure electric bus when entering the speed limit adjustment, and P_max is the maximum driving power of the vehicle.

[0116] According to formula (2), the maximum driving power at the current vehicle speed is calculated as follows:

[0117] P_current_max=P_max-K×(V-V1) (3)

[0118] Where P_max represents the maximum available power of the drive system, K represents the adjustment ratio, V1 is the initial speed of the pure electric bus when entering the speed limit adjustment, and V represents the current speed.

[0119] By following the steps described above, speed limiting is achieved by reaching the maximum drive power value.

[0120] Those skilled in the art will understand that the modules or steps of the present invention described above can be implemented using general-purpose computer devices. Optionally, they can be implemented using computer-executable program code, thereby allowing them to be stored in a storage device for execution by a computer device, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. The present invention is not limited to any particular combination of hardware and software.

[0121] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A control system for the maximum speed limit of a pure electric bus, characterized in that, include: Instruments and speed limiters; The speed limiting device includes a vehicle controller; The instrument receives the set maximum speed limit and sends a maximum speed limit request to the vehicle controller; the vehicle controller responds to the maximum speed limit request with an actual maximum speed limit based on a judgment strategy. The vehicle controller's judgment strategy is as follows: The vehicle controller sets a fixed upper limit and a fixed lower limit for the maximum vehicle speed. The vehicle speed limit responded by the vehicle controller does not exceed the upper limit and the lower limit. If the requested maximum speed limit after instrument adjustment is less than the fixed lower limit, the fixed lower limit is used as the maximum speed limit. Otherwise, the requested maximum speed limit after instrument adjustment is compared with the fixed upper limit. If the requested maximum speed limit after instrument adjustment is greater than the fixed upper limit, the fixed upper limit is used as the actual maximum speed limit. Otherwise, the maximum speed limit after instrument adjustment is used as the actual maximum speed limit. The maximum vehicle speed T_current_max is controlled by limiting the drive torque. The calculation formula is: T_current_max = 9550 × P_current_max / n_current, where n_current represents the current motor speed, P_current_max represents the power of the drive system, and when T1 > T_current_max, then T2 = T_current_max; when T1 ≤ T_current_max, then T2 = T1. T1 is the current drive torque value, T_current_max is the current maximum limited drive torque, and T2 is the final output drive torque. The maximum driving power at the current vehicle speed is calculated using the following formula: ； in, Indicates the maximum available power of the drive system. This indicates the adjustment ratio; V1 is the initial speed of the pure electric bus when entering speed limit adjustment. Indicates the current vehicle speed.

2. The control system for the maximum speed limit of a pure electric bus as described in claim 1, characterized in that, The instrument includes a processor and an instrument panel interface; The dashboard interface is used to adjust the maximum speed limit value and display the maximum speed limit. The processor is used to send the adjusted maximum speed limit request message to the vehicle controller, and at the same time, receive the actual maximum speed limit response sent by the vehicle controller and store the actual maximum speed limit.

3. The control system for the maximum speed limit of a pure electric bus as described in claim 1, characterized in that, The instrument cluster and vehicle controller communicate via a CAN bus.

4. The control system for the maximum speed limit of a pure electric bus as described in claim 2, characterized in that, The instrument panel interface has a maximum speed limit sub-interface. In the maximum speed limit sub-interface, the values ​​on the instrument panel are adjusted by pressing the + / - buttons. The minimum adjustment value is 1 km / h. Press the '+' button to increase the speed by 1 km / h, and press the '-' button to decrease the speed by 1 km / h. The adjusted value is displayed on the interface. After adjustment, press the confirmation button.

5. A pure electric bus, characterized in that, Includes a control system for the maximum speed limit of a pure electric bus as described in claim 1, an accelerator pedal, a motor controller, and a motor; The control system receives the voltage signal sent by the accelerator pedal, parses the current accelerator pedal opening percentage, reads the CAN message sent by the motor controller, parses the current motor speed value, calculates the current driving torque based on the current motor speed value and the accelerator pedal opening percentage, and controls the vehicle's maximum speed limit by limiting the driving torque.

6. A method for controlling the maximum speed limit of a pure electric bus, employing a control system for the maximum speed limit of a pure electric bus as described in any one of claims 1-4, characterized in that, include: Obtain the start signal and read the memory value stored after the start power is turned off as the current maximum speed limit; Adjust the current maximum speed limit and send the adjusted maximum speed limit to the vehicle controller in the form of a request message; The vehicle controller responds to the received maximum speed limit request according to the judgment strategy, obtains the actual maximum speed limit, and sends it to the instrument panel for display and storage.

7. The method for controlling the maximum speed limit of a pure electric bus as described in claim 6, characterized in that, Also includes: When the vehicle controller performs a speed limiting operation, it obtains the current vehicle speed. When the current vehicle speed reaches the maximum speed limit, the drive power is at its lowest, and the current vehicle speed will no longer increase. When the current drive power is the maximum drive power, the speed limiting is completed.

8. The method for controlling the maximum speed limit of a pure electric bus as described in claim 6, characterized in that, The vehicle controller's decision-making strategy is as follows: the vehicle controller sets a fixed upper limit value and a fixed lower limit value for the maximum vehicle speed, and the vehicle speed limit responded by the vehicle controller does not exceed the upper limit value and the lower limit value for the maximum vehicle speed. If the maximum speed limit requested after instrument adjustment is less than the fixed lower limit of the maximum speed limit, then the fixed lower limit of the maximum speed limit will be used as the maximum speed limit. Otherwise, the maximum speed limit requested after instrument adjustment will be compared with the fixed upper limit of the maximum speed limit. If the requested maximum speed limit after instrument adjustment is greater than the fixed value of the maximum speed limit, the fixed value of the maximum speed limit will be used as the actual maximum speed limit. Otherwise, the maximum speed limit after instrument adjustment will be used as the actual maximum speed limit.

9. The method for controlling the maximum speed limit of a pure electric bus as described in claim 6, characterized in that, To adjust the current maximum speed limit, in the instrument panel's maximum speed limit sub-interface, use the + / - buttons to adjust the values ​​on the instrument panel. The minimum adjustment value is 1 km / h. Press the '+' button to increase the speed limit by 1 km / h, and press the '-' button to decrease the speed limit by 1 km / h. The adjusted value will be displayed on the interface. After adjusting, press the confirmation button.

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