An electric trailer control system and a vehicle

Abstract

The present invention discloses an electric trailer control system and vehicle, comprising: an electric drive axle for converting the trailer's kinetic energy into electrical energy to charge a power battery when braking the trailer; a vehicle controller, upon determining that the vehicle is in an accelerating state, determines the driving torque required from the electric drive axle; or upon determining that the vehicle is in a decelerating state, determines the initial braking torque required from the electric drive axle and the required charge for the power battery, and transmits the driving torque and initial braking torque to the electric drive axle controller, and the required charge to a battery management system; the vehicle controller, based on feedback from the battery management system, ultimately determines the final braking torque required from the electric drive axle, and transmits the final braking torque to the electric drive axle controller. The present invention can enable the tractor's engine to operate within an economic range, improve the vehicle's power performance, reduce fuel consumption, and effectively prevent the vehicle from folding or overturning during braking.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to an electric trailer control system and a vehicle. Background Art

[0002] In the automobile freight industry, especially in large-scale cargo transportation services, trailers are the most widely used. However, common trailers have no driving power of their own and rely entirely on the tractor to drive them, with all driving force output by the tractor. When the vehicle accelerates, they cannot provide power to the vehicle, requiring the tractor engine to operate under high load conditions in a non-economic range, resulting in high fuel consumption. When the vehicle decelerates, they cannot provide braking force, which will cause the risk of skidding and vehicle folding. Summary of the Invention

[0003] The present invention provides an electric trailer control system and a vehicle, which can enable the engine of a tractor to operate within an economic range, increase the power performance of the entire vehicle, reduce fuel consumption, and effectively prevent the entire vehicle from folding or overturning during braking.

[0004] According to one aspect of the present invention, there is provided an electric trailer control system, comprising:

[0005] Vehicle controller and trailer drive system;

[0006] The trailer drive system includes an electric drive axle controller, an electric drive axle, a battery management system, and a power battery. The power battery is used to power the electric drive axle, which is used to provide driving force for the trailer or brake the trailer. When braking the trailer, the trailer's kinetic energy is converted into electrical energy to charge the power battery.

[0007] The vehicle controller is used to determine the driving torque required by the electric drive axle when the vehicle is determined to be in an accelerating state, and send the driving torque to the electric drive axle controller; the vehicle controller is used to determine the initial braking torque required by the electric drive axle and the required power to be charged to the power battery when the vehicle is determined to be in a decelerating state, and send the required power to the battery management system;

[0008] The battery management system is used to send feedback information to the vehicle controller when receiving the required power;

[0009] The vehicle controller is used to determine the final braking torque required by the electric drive axle based on the feedback information and send the final braking torque to the electric drive axle controller;

[0010] The electric drive axle controller is used to control the working state of the electric drive axle according to the driving torque or the final braking torque.

[0011] Optionally, the battery management system is configured to send a confirmation message to the vehicle controller when the required power is less than or equal to the maximum chargeable power of the power battery, and to send the maximum chargeable power to the vehicle controller when the required power is greater than the maximum chargeable power of the power battery;

[0012] The vehicle controller is used to determine the initial braking torque as the final braking torque when the feedback information is confirmation information, and to determine the final braking torque according to the maximum chargeable power when the feedback information is the maximum chargeable power.

[0013] Optionally, the vehicle controller is further configured to send a braking reminder message to the tractor cab when determining the final braking torque based on the maximum chargeable power, so as to remind the driver to actively brake.

[0014] Optionally, the vehicle controller is configured to send a power inquiry instruction to the battery management system when determining that the vehicle is in a coasting state;

[0015] The battery management system is used to send the maximum chargeable power to the vehicle controller upon receiving a power inquiry command;

[0016] The vehicle controller is used to send a coasting energy recovery instruction to the electric drive axle controller according to the maximum chargeable power when receiving the maximum chargeable power;

[0017] The electric drive axle controller is used to control the working state of the electric drive axle according to the coasting energy recovery instruction, so that the electric drive axle converts the kinetic energy of the trailer into electrical energy to charge the power battery.

[0018] Optionally, the vehicle controller is used to determine the vehicle status based on the first vehicle information, wherein the first vehicle information includes the tractor accelerator pedal opening information, the tractor brake pedal opening information and the trailer brake gear handle information.

[0019] Optionally, the deceleration state includes a main brake deceleration condition and a trailer brake deceleration condition.

[0020] Optionally, the vehicle controller is used to determine the driving torque required to be output by the electric drive axle based on the second vehicle information, or to determine the initial braking torque required to be provided by the electric drive axle and the required amount of power to be charged to the power battery based on the second vehicle information; the second vehicle information includes vehicle load information, road slope information, tractor engine operating condition information, power battery information and electric drive axle working status information.

[0021] According to another aspect of the present invention, an electric trailer is provided, comprising the electric trailer control system provided by any embodiment of the present invention.

[0022] According to another aspect of the present invention, a vehicle is provided, comprising a tractor and the electric trailer provided by any embodiment of the present invention.

[0023] Optionally, the tractor includes a tractor drive system;

[0024] The tractor drive system includes an engine, an engine controller, a transmission, and a transmission controller;

[0025] The vehicle controller is used to obtain engine operating status information from the engine controller, obtain transmission operating status information from the transmission controller, send engine required torque information to the engine controller, and send required gear position information to the transmission controller;

[0026] The engine controller is used to control the working state of the engine according to the engine demand torque information;

[0027] The gearbox controller is used to control the working state of the gearbox according to the required gear information.

[0028] In an embodiment of the present invention, when the vehicle controller determines that the vehicle is in an accelerating state, the vehicle controller transmits the calculated driving torque to the electric drive axle controller, which controls the electric drive axle to output the driving torque. When the vehicle controller determines that the vehicle is in a decelerating state, the vehicle controller calculates the initial braking torque of the electric drive axle and the amount of electricity required to be charged to the power battery, and sends the required electricity to the battery management system. Upon receiving the required electricity, the battery management system sends feedback information to the vehicle controller. The vehicle controller calculates the final braking torque required to be provided by the electric drive axle based on the feedback information received from the battery management system, and transmits the final braking torque to the electric drive axle controller, which controls the electric drive axle to output the final braking torque. In an embodiment of the present invention, by controlling the driving torque output by the electric drive axle, the tractor assists the tractor in providing driving torque to the trailer, thereby enabling the tractor's engine to operate within an economic range, thereby increasing the vehicle's power performance and reducing fuel consumption. Furthermore, by braking and decelerating the trailer using the braking torque output by the electric drive axle and the energy recovery function of the power battery, the trailer can be effectively prevented from folding or overturning.

[0029] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0031] Figure 1 Schematic diagram of an electric trailer control system provided in Example 1 of the present invention;

[0032] Figure 2 This is a schematic diagram of control information of an electric trailer control system provided by the first embodiment of the present invention;

[0033] Figure 3 It is a structural schematic diagram of a vehicle provided in Example 2 of the present invention. DETAILED DESCRIPTION

[0034] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0035] It should be noted that the terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0036] Example 1

[0037] The present invention provides an electric trailer control system. Figure 1 This is a schematic diagram of an electric trailer control system provided by the first embodiment of the present invention, with reference to Figure 1 , including: a vehicle controller 110 and a trailer drive system 120; the trailer drive system 120 includes an electric drive axle controller 121, an electric drive axle 122, a battery management system 124 and a power battery 123. The power battery 123 is used to power the electric drive axle 122. The electric drive axle 122 is used to provide driving force for the trailer or brake the trailer, and when braking the trailer, the kinetic energy of the trailer is converted into electrical energy to charge the power battery 123.

[0038] The vehicle controller 110 is used to determine the driving torque required to be output by the electric drive axle 122 when determining that the vehicle state is an acceleration state, and send the driving torque to the electric drive axle controller 121; the vehicle controller 110 is used to determine the initial braking torque required to be provided by the electric drive axle 122 and the required amount of electricity to be charged to the power battery 123 when determining that the vehicle state is a deceleration state, and send the required amount of electricity to the battery management system 124; the battery management system 124 is used to send feedback information to the vehicle controller 110 when receiving the required amount of electricity; the vehicle controller 110 is used to finally determine the final braking torque required to be provided by the electric drive axle 122 based on the feedback information, and send the final braking torque to the electric drive axle controller 121; the electric drive axle controller 121 is used to control the working state of the electric drive axle 122 according to the driving torque or the final braking torque.

[0039] Among them, the vehicle controller 110 is used to coordinate and control the state of the vehicle, and realizes the coordinated control of the vehicle by receiving the vehicle operation information and sending control instructions. The electric drive bridge 122 may include a motor and a transmission mechanism. The power battery 123 can power the motor, and the motor rotates, which can drive the trailer to move forward or slow down through the transmission mechanism. When the vehicle controller 110 determines that the vehicle operation state is the acceleration state, it can calculate the driving torque output by the electric drive bridge 122 based on the vehicle operation information. The vehicle controller 110 can transmit the calculated driving torque to the electric drive bridge controller 121 through network communication, wherein the network communication can be CAN or CANFD. The electric drive bridge controller 121 controls the electric drive bridge 122 to output the driving torque.

[0040] When the vehicle controller 110 determines that the vehicle is in a deceleration state, the electric drive axle 122 brakes the trailer and converts the trailer's kinetic energy into electrical energy to charge the power battery 123. The vehicle controller 110 can calculate the initial braking torque of the electric drive axle 122 and the amount of electricity that needs to be charged into the power battery 123. The battery management system 124 receives the required amount of electricity to be charged by the power battery 123, and can send feedback information to the vehicle controller 110. The feedback information can be that the required amount of electricity can be charged, or the maximum amount of electricity that can be charged into the power battery. The vehicle controller 110 determines whether the required amount of electricity is charged based on the feedback information. When the required amount of electricity can be charged, it means that the initial braking torque provided by the electric drive axle 122 can complete the braking. Then the initial braking torque is sent to the electric drive axle controller 121 as the final braking torque, and the electric drive axle controller 121 controls the electric drive axle 122 to output the final braking torque; when the required amount of electricity cannot be charged, it means that the electric drive axle 122 cannot provide the initial braking torque, and the braking torque needs to be recalculated based on the maximum amount of electricity that can be charged into the power battery 123.

[0041] In this embodiment of the present invention, when the vehicle controller 110 determines that the vehicle is in an accelerating state, the vehicle controller 110 transmits the calculated driving torque to the electric drive axle controller 121, and the electric drive axle controller 121 controls the electric drive axle 122 to output the driving torque; when the vehicle controller 110 determines that the vehicle is in a decelerating state, the vehicle controller 110 calculates the initial braking torque of the electric drive axle 122 and the amount of electricity that needs to be charged in the power battery 123, and sends the required electricity to the battery management system 124. When the battery management system 124 receives the required electricity, it sends feedback information to the vehicle controller 110. The vehicle controller 110 calculates the final braking torque required to be provided by the electric drive axle 122 based on the feedback information received from the battery management system 124, and transmits the final braking torque to the electric drive axle controller 121. The electric drive axle controller 121 controls the electric drive axle 122 to output the final braking torque. The embodiment of the present invention controls the driving torque output by the electric drive axle 122 to assist the tractor in providing driving torque for the trailer, so that the engine of the tractor can operate within the economic range, thereby increasing the power performance of the entire vehicle and reducing fuel consumption. In addition, the trailer is braked and decelerated through the braking torque output by the electric drive axle and the energy recovery function of the power battery 123, which can effectively prevent the vehicle from folding and rolling over.

[0042] Optionally, the battery management system 124 is used to send confirmation information to the vehicle controller 110 when the required power is less than or equal to the maximum chargeable power of the power battery 123, and to send the maximum chargeable power to the vehicle controller 110 when the required power is greater than the maximum chargeable power of the power battery 123; the vehicle controller 110 is used to determine the initial braking torque as the final braking torque when the feedback information is confirmation information, and to determine the final braking torque based on the maximum chargeable power when the feedback information is the maximum chargeable power.

[0043] The battery management system 124 can calculate the maximum charge that can be charged into the power battery 123. When the required charge sent by the vehicle controller 110 is less than or equal to the maximum charge that can be charged into the power battery 123, the battery management system 124 can send a confirmation message to the vehicle controller 110, confirming that the required charge can be charged into the power battery 123, and the vehicle controller 110 determines the initial braking torque as the final braking torque. When the required charge exceeds the maximum charge that can be charged into the power battery 123, the power battery 123 cannot be charged into the required charge, and the vehicle controller 110 determines the final braking torque based on the maximum charge that can be charged.

[0044] Optionally, the vehicle controller 110 is further configured to send a braking reminder message to the tractor cab when determining the final braking torque according to the maximum chargeable power, so as to remind the driver to actively brake.

[0045] Among them, when the vehicle controller 110 determines the final braking torque based on the maximum amount of electricity charged, the electric drive axle 122 cannot provide the required initial braking torque, that is, it cannot provide sufficient braking force. The vehicle controller 110 can send a voice reminder message to the tractor cab or control the brake indicator light in the cab to light up, etc., to remind the driver to cooperate with stepping on the brake pedal to brake.

[0046] Optionally, the vehicle controller 110 is used to send a power inquiry instruction to the battery management system 124 when it determines that the vehicle is in a coasting state; the battery management system 124 is used to send the maximum chargeable power to the vehicle controller 110 when it receives the power inquiry instruction; the vehicle controller 110 is used to send a coasting energy recovery instruction to the electric drive axle controller 110 according to the maximum chargeable power when it receives the maximum chargeable power; the electric drive axle controller 121 is used to control the working state of the electric drive axle 122 according to the coasting energy recovery instruction, so that the electric drive axle 122 converts the kinetic energy of the trailer into electrical energy to charge the power battery.

[0047] Among them, the power inquiry instruction can be the maximum required power that can be charged into the power battery, or the current remaining power of the power battery. The vehicle controller 110 determines the energy that needs to be recovered by the electric drive bridge based on the maximum chargeable power, thereby determining the torque that needs to be output by the electric drive bridge, and sends a coasting energy recovery instruction to the electric drive bridge controller 110 based on the torque. The electric drive bridge controller 110 controls the electric drive bridge to recover energy and charges the recovered energy into the power battery 123 to recycle energy and improve energy utilization efficiency.

[0048] Figure 2 This is a schematic diagram of control information of an electric trailer control system provided in Example 1 of the present invention. Optionally, the vehicle controller 110 is used to determine the vehicle status based on first vehicle information, wherein the first vehicle information includes tractor accelerator pedal opening information, tractor brake pedal opening information and trailer brake gear handle information.

[0049] Among them, the first vehicle information is the operation information of the whole vehicle. When the tractor accelerator pedal opening information is greater than 0, it can be determined that the whole vehicle state is the acceleration state. When the tractor brake pedal opening information is greater than 0, it can be determined that the whole vehicle state is the main braking deceleration state. The trailer brake gear handle information includes the position information of the handle. When the position of the handle is not in the initial position, it can be determined that the whole vehicle state is the trailer braking deceleration state.

[0050] Optionally, the deceleration state includes a main brake deceleration condition and a trailer brake deceleration condition.

[0051] Among them, when the deceleration state is the main braking deceleration condition, the driver is stepping on the brake pedal to brake, and the vehicle information can be used to determine whether the electric drive axle needs to participate in braking and how much braking torque the electric drive axle needs to output; when the deceleration state is trailer braking deceleration, braking is performed through the electric drive axle of the trailer, and the initial braking torque output by the electric drive axle and the required power to be charged in the power battery are calculated based on the vehicle information, and the feedback information from the battery management system is used to determine whether the electric drive axle can meet the braking requirements. When the braking torque output by the electric drive axle meets the braking requirements, braking can be performed through the electric drive axle. When the braking torque output by the electric drive axle cannot meet the braking requirements, the driver can be reminded to assist in braking, and the driver needs to cooperate in stepping on the brake pedal to brake.

[0052] Optionally, the vehicle controller 110 is used to determine the driving torque required to be output by the electric drive axle based on the second vehicle information, or to determine the initial braking torque required to be provided by the electric drive axle and the required amount of power to be charged to the power battery based on the second vehicle information; the second vehicle information includes vehicle load information, road slope information, tractor engine operating condition information, power battery information and electric drive axle working status information.

[0053] The vehicle load information refers to the vehicle's gross weight, the road slope information may include the steepness of the road, the tractor engine operating condition information may include engine idling, light load, medium load, heavy load, and full load, the power battery information refers to the current remaining power battery charge / capacity, and the electric drive axle operating state information may include output drive torque information or braking torque information. When the first vehicle information determines that the vehicle is currently in an accelerating state, the second vehicle information can be used to calculate the output drive torque of the electric drive axle. When the first vehicle information determines that the vehicle is currently in an active deceleration state, the second vehicle information can be used to calculate whether the trailer needs to participate in braking, as well as the initial braking torque provided by the electric drive axle and the required charge to the power battery.

[0054] This embodiment of the present invention can determine the operating status of the vehicle based on the first vehicle information. Based on the second vehicle information, when the vehicle requires a larger power output, the electric drive axle of the electric trailer can provide driving force. When the vehicle is coasting during normal driving, the electric drive axle of the electric trailer can appropriately recover energy, converting the trailer's kinetic energy into electrical energy to charge the power battery. When the vehicle is braking, the electric drive axle of the electric trailer 100 can provide appropriate braking torque and perform brake energy recovery. Power battery energy can be perfectly managed under any operating condition, and both energy recovery and energy output can meet the driver's intentions and make rational use of comprehensive vehicle information.

[0055] Example 2

[0056] An embodiment of the present invention provides an electric trailer based on the above embodiments, including any one of the electric trailer control systems provided by the embodiments of the present invention.

[0057] Among them, the electric trailer control system is arranged inside the electric trailer.

[0058] An embodiment of the present invention further provides a vehicle, Figure 3 This is a schematic diagram of the structure of a vehicle provided by the second embodiment of the present invention, with reference to Figure 3 , including: a tractor 200 and an electric trailer 100 provided by any embodiment of the present invention.

[0059] The tractor 200 is an electric trailer head.

[0060] Optionally, the tractor 200 includes a tractor drive system 210; the tractor drive system 210 includes an engine 212, an engine controller 211, a gearbox 213 and a gearbox controller 214; the vehicle controller 110 is used to obtain the working status information of the engine 212 from the engine controller 211, obtain the working status information of the gearbox 213 from the gearbox controller 214, send the engine 212 required torque information to the engine controller 211, and send the required gear information to the gearbox controller 214; the engine controller 211 is used to control the working status of the engine according to the engine 212 required torque information; the gearbox controller 214 is used to control the working status of the gearbox 213 according to the required gear information.

[0061] Among them, the required torque information of the engine 212 is an indicator of the engine's acceleration capability. The greater the torque output, the better the acceleration performance. The required gear information can be information for adjusting the speed. The vehicle controller 110 sends the required torque information of the engine 212 to the engine controller 211. The engine controller 211 controls the acceleration capability of the engine. The vehicle controller 110 sends the required gear information to the transmission controller 214. The transmission controller 214 controls the speed change according to the gear information, and can accelerate or decelerate.

[0062] The embodiment of the present invention provides a vehicle, including a tractor 200 and an electric trailer 100 provided in any embodiment of the present invention. When the vehicle requires a large power output, the electric drive axle of the electric trailer 100 can provide driving force. When the vehicle is in normal driving and gliding, the electric drive axle of the electric trailer 100 can appropriately recover energy, converting the trailer's kinetic energy into electrical energy to charge the power battery. When the vehicle is braking, the electric drive axle of the electric trailer 100 can provide appropriate braking torque and perform braking energy recovery. The power battery energy can be perfectly managed under any working condition. Whether it is energy recovery or energy output, it can meet the driver's intention and reasonably utilize the vehicle's comprehensive information.

[0063] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0064] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. An electric trailer control system, characterized in that: include: Vehicle controller and trailer drive system; The trailer drive system includes an electric drive axle controller, an electric drive axle, a battery management system, and a power battery. The power battery is used to power the electric drive axle, and the electric drive axle is used to provide driving force for the trailer or brake the trailer. When braking the trailer, the kinetic energy of the trailer is converted into electrical energy to charge the power battery. The vehicle controller is used to determine the driving torque required to be output by the electric drive axle when the vehicle is determined to be in an accelerating state, and send the driving torque to the electric drive axle controller; the vehicle controller is used to determine the initial braking torque required to be provided by the electric drive axle and the required amount of electricity to be charged to the power battery when the vehicle is determined to be in a decelerating state, and send the required amount of electricity to the battery management system; The battery management system is used to send feedback information to the vehicle controller when receiving the required power; The vehicle controller is used to finally determine the final braking torque required to be provided by the electric drive axle according to the feedback information, and send the final braking torque to the electric drive axle controller; The electric drive axle controller is used to control the working state of the electric drive axle according to the driving torque or the final braking torque; The feedback information includes the required amount of electricity that can be charged, or the maximum amount of electricity that can be charged into the power battery; The battery management system is configured to send a confirmation message to the vehicle controller when the required power is less than or equal to the maximum chargeable power of the power battery, and to send the maximum chargeable power to the vehicle controller when the required power is greater than the maximum chargeable power of the power battery; The vehicle controller is configured to determine the initial braking torque as the final braking torque when the feedback information is confirmation information, and to determine the final braking torque according to the maximum chargeable power when the feedback information is the maximum chargeable power; The vehicle controller is further configured to send a braking reminder message to the tractor cab when determining the final braking torque according to the maximum chargeable power, so as to remind the driver to actively brake.

2. The electric trailer control system according to claim 1, characterized in that: The vehicle controller is used to send a power inquiry instruction to the battery management system when determining that the vehicle state is a coasting state; The battery management system is used to send the maximum chargeable power to the vehicle controller when receiving the power inquiry instruction; The vehicle controller is configured to send a coasting energy recovery instruction to the electric drive axle controller according to the maximum chargeable power upon receiving the maximum chargeable power; The electric drive axle controller is used to control the working state of the electric drive axle according to the coasting energy recovery instruction, so that the electric drive axle converts the kinetic energy of the trailer into electrical energy to charge the power battery.

3. The electric trailer control system according to claim 1, characterized in that: The vehicle controller is used to determine the vehicle status according to first vehicle information, wherein the first vehicle information includes tractor accelerator pedal opening information, tractor brake pedal opening information and trailer brake gear handle information.

4. The electric trailer control system according to claim 3, characterized in that: The deceleration state includes a main brake deceleration condition and a trailer brake deceleration condition.

5. The electric trailer control system according to claim 1, characterized in that: The vehicle controller is used to determine the driving torque required to be output by the electric drive axle according to the second vehicle information, or to determine the initial braking torque required to be provided by the electric drive axle and the required amount of electricity to be charged to the power battery according to the second vehicle information; the second vehicle information includes vehicle load information, road slope information, tractor engine operating condition information, power battery information and electric drive axle working status information.

6. An electric trailer, characterized in that: The electric trailer control system comprises the control system according to any one of claims 1 to 5.

7. A vehicle, characterized in that: It comprises a tractor and the electric trailer according to claim 6.

8. The vehicle according to claim 7, characterized in that: The tractor includes a tractor drive system; The tractor drive system includes an engine, an engine controller, a transmission and a transmission controller; The vehicle controller is used to obtain engine operating status information from the engine controller, obtain transmission operating status information from the transmission controller, send engine required torque information to the engine controller, and send required gear position information to the transmission controller; The engine controller is used to control the working state of the engine according to the engine required torque information; The transmission controller is used to control the working state of the transmission according to the required gear information.

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