Electrically powered trailer

Abstract

The application discloses an electric trailer, comprising: a trailer body, at least comprising a frame; a handle device connected to the trailer body; a walking assembly, at least comprising a walking wheel and a walking motor driving the walking wheel to rotate; a power interface for electrically connecting with a direct current power supply to supply power for the walking motor; a controller at least electrically connected with the walking motor to control the walking motor to rotate; wherein the walking motor can be driven by external force to generate power generation electric energy; the electric trailer further comprises an electric energy consumption device and a circuit on-off device, wherein the circuit on-off device is configured to disconnect or connect the power supply loop of the walking motor, and the electric energy consumption device is configured to consume the power generation electric energy generated by the walking motor.

Description

Technical Field

[0001] This disclosure relates to a type of transport vehicle, such as an electric trailer. Background Technology

[0002] As people's living standards continue to improve, various outdoor activities have gradually become the preferred choice for relaxation, such as outdoor picnics or camping. Generally, these activities require carrying a lot of items, which can be inconvenient. To meet these needs, electric-assisted outdoor picnic trailers have become widely popular. These trailers are powered by a motor driving the wheels, greatly reducing the force exerted by the user and simplifying operation.

[0003] In related technologies, the drive motor of an electric trailer generates electricity under external force. For example, when the user drags the electric trailer after work is completed and the power is off, the drive motor rotates and generates electricity; or during normal operation, the electric trailer generates electricity when descending a slope, or when pushing the electric trailer forward in other states. However, this generated electricity can easily discharge to the control board or charge the battery pack, leading to abnormal conditions or even damage to the machine.

[0004] This section provides background information related to this application, which is not necessarily prior art. Summary of the Invention

[0005] One object of this application is to solve or at least mitigate some or all of the aforementioned problems. Therefore, one object of this application is to provide a safer electric trailer.

[0006] To achieve the above objectives, this application adopts the following technical solution:

[0007] An electric trailer includes: a trailer body, including at least a frame; a handle assembly connected to the trailer body; a running gear, including at least running wheels and a running motor for driving the running wheels to rotate; a power interface for electrical connection to a DC power source to power the running motor; and a controller, at least electrically connected to the running motor, for controlling the rotation of the running motor; wherein the running motor can generate electrical energy by being driven by an external force; the electric trailer also includes an energy consumption device and a circuit switching device, wherein the circuit switching device is configured to disconnect or connect the power circuit of the running motor, and the energy consumption device is configured to consume the electrical energy generated by the running motor.

[0008] In one embodiment, the power consuming device includes at least one resistor and a switch connected in series with the resistor.

[0009] In one embodiment, the circuit switching device includes a relay, which is disposed between the walking motor and its drive circuit.

[0010] In one embodiment, the circuit switching device includes at least two relays, which are respectively connected between the two windings of the walking motor and the switch of its drive circuit.

[0011] In one embodiment, the electric trailer further includes a power-on unit, wherein the relay is disconnected when the power-on unit is not powered on, and the relay is closed when the power-on unit is powered on.

[0012] In one embodiment, the controller, drive circuit, relay, resistor, and switch are disposed in the airflow path of the fan of the walking motor.

[0013] In one embodiment, the electric trailer also includes an electrical control box, in which a controller, drive circuit, relay, resistor, switch and drive motor are all located.

[0014] In one embodiment, an air inlet and an air outlet are provided at the bottom of the electrical control box.

[0015] In one embodiment, the air inlet has a labyrinth structure; the air outlet has a flared structure.

[0016] In one embodiment, a drain outlet is provided at the bottom of the electrical control box.

[0017] This application also provides a technical solution:

[0018] An electric trailer includes: a trailer body, including at least a frame; a handle device connected to the trailer body; a running gear, including at least running wheels and a running motor for driving the running wheels to rotate; a power interface for electrically connecting to a battery pack to supply power to the electric trailer; and a controller electrically connected to at least the running motor and the battery pack; wherein the running motor can be driven by an external force to generate electrical energy; and the controller is configured to: acquire operating parameters of the battery pack; and control the charging and discharging switching of the battery pack according to the operating parameters when the running motor generates electrical energy.

[0019] In one embodiment, the operating parameters include at least one of battery pack voltage and temperature.

[0020] In one embodiment, the electric trailer further includes an energy-consuming device, which includes at least one resistor and a switch connected in series with the resistor.

[0021] In one embodiment, the operating parameters include the battery pack voltage. When the voltage exceeds a voltage threshold, the controller turns on the switch to discharge the battery pack to the resistor; when the voltage does not exceed the voltage threshold, the controller turns off the switch to charge the battery pack.

[0022] In one embodiment, the operating parameters include the battery pack temperature. When the temperature exceeds a temperature threshold, the controller turns on the switch to discharge the battery pack to the resistor; when the temperature does not exceed the temperature threshold, the controller turns off the switch to charge the battery pack.

[0023] In one embodiment, the resistance value ranges from 1Ω to 10Ω.

[0024] In one embodiment, the controller, resistor, and switch are located in the airflow path of the fan of the walking motor.

[0025] In one embodiment, the electric trailer also includes an electrical control box, in which a controller, resistor, switch and drive motor are all housed.

[0026] In one embodiment, an air inlet and an air outlet are provided at the bottom of the electrical control box.

[0027] In one embodiment, the walking motor is a brushless motor. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 This is a structural diagram of an electric trailer provided in one embodiment of this application;

[0030] Figure 2 yes Figure 1 A partial schematic diagram of the control box of the electric trailer in the picture;

[0031] Figure 3 This is a schematic diagram of the control circuit of an electric trailer in one embodiment of this application;

[0032] Figure 4 yes Figure 1 A schematic diagram of the control circuit after the start-up unit of the electric trailer is started.

[0033] Figure 5 This is a schematic diagram of the control circuit for charging the battery pack;

[0034] Figure 6 This is a schematic diagram of the control circuit for battery pack discharge;

[0035] Figure 7 This is a schematic diagram of the control circuit of the electric trailer in another embodiment of this application;

[0036] Figure 8 yes Figure 2A schematic diagram of the internal main control board of the central control box;

[0037] Figure 9 This is a structural schematic diagram of the electrical control box viewed from below;

[0038] Figure 10 This is a side view of the electrical control box. Detailed Implementation

[0039] Before explaining any implementation of this application in detail, it should be understood that this application is not limited to its application to the structural details and component arrangements set forth in the following description or shown in the above drawings.

[0040] In this application, the terms "comprising," "including," "having," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0041] In this application, the term "and / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this application generally indicates that the preceding and following related objects have an "and / or" relationship.

[0042] In this application, the terms "connection," "combination," "coupling," and "installation" can refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without the need for an intermediary, while an indirect connection refers to two parts or components each being connected to at least one intermediary, with the connection achieved through the intermediary. Furthermore, "connection" and "coupling" are not limited to physical or mechanical connections or couplings, but can also include electrical connections or couplings.

[0043] In this application, those skilled in the art will understand that relative terms (e.g., “about,” “approximately,” “basically,” etc.) used in conjunction with quantities or conditions are to include the values ​​and have the meaning indicated by the context. For example, such relative terms include at least the degree of error associated with the measurement of a particular value, tolerances associated with the particular value due to manufacturing, assembly, use, etc. Such terms should also be considered as disclosing a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. Furthermore, “basically” when expressing relative angular relationships (e.g., substantially parallel, substantially perpendicular) may refer to a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) added to or subtracted from the indicated angle.

[0044] In this application, those skilled in the art will understand that the function performed by a component can be performed by one component, multiple components, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one component, or a combination of multiple parts.

[0045] In this application, the directional terms "upper," "lower," "left," "right," "front," and "rear" are used to describe the orientation and positional relationships shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should be understood that when an element is mentioned as being connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected through an intermediate element. It should also be understood that directional terms such as upper side, lower side, left side, right side, front side, and rear side not only represent positive orientation but can also be understood as lateral orientation. For example, "below" can include directly below, lower left, lower right, lower front, and lower rear.

[0046] In this application, the terms "controller," "processor," "central processing unit," "CPU," and "MCU" are used interchangeably. When using the unit "controller," "processor," "central processing unit," "CPU," or "MCU" to perform a specific function, unless otherwise stated, these functions may be performed by a single or multiple of the aforementioned units.

[0047] In this application, the terms "device," "module," or "unit" are used to describe devices that can be implemented in hardware or software to perform a specific function.

[0048] In this application, the terms “calculation,” “judgment,” “control,” “determine,” “identify,” etc., refer to the operation and process of a computer system or similar electronic computing device (e.g., controller, processor, etc.).

[0049] The electric trailer described in this application can be a family outdoor camping trailer, a construction trailer, a warehouse trailer, or a trailer used in other situations. The following description uses an electric outdoor camping trailer as an example.

[0050] Reference Figure 1 The electric trailer 100 shown is specifically an electric outdoor camping trailer. In this embodiment, the electric trailer 100 is mainly used by users when camping or playing outdoors to transport outdoor camping tools, such as tents, cooking utensils, food, lights, tableware, electrical equipment, tables, supports, etc., and can even carry infants and children. Therefore, the electric trailer 100 can carry a relatively large weight. In this embodiment, the electric trailer 100 moves with electric assistance, which greatly reduces the force applied to the trailer 100 by the user, making it easier for the user to operate.

[0051] In this embodiment, the electric trailer 100 can be towed by the user, that is, the electric trailer 100 follows behind the user. The electric trailer 100 can also be pushed by the user, that is, the electric trailer 100 moves in front of the user, that is, the user follows behind the electric trailer 100.

[0052] In some embodiments, the electric trailer 100 can also be a trailer used on a construction site, in which case the electric trailer can transport building materials, construction tools, construction equipment, etc. on the construction site.

[0053] In some embodiments, the electric trailer 100 can also be a trailer used in a warehouse, in which case the electric trailer can transport shelves, goods, tools, equipment, etc.

[0054] In this embodiment, as Figure 1 As shown, the electric trailer 100 may include at least a trailer body 110, a handle assembly 120, a running gear 130, a power interface 140, and a controller 150. Spatial orientations in the following descriptions are... Figure 1The coordinate system shown is used as the reference. In this embodiment, the trailer body 110 may include a frame 111 and a barrier 112 detachably connected to the frame 111. The frame 111 is a detachable and foldable frame. The foldable frame 111 and the barrier 112 together can form a three-dimensional storage space or towing space, which is generally a cubic space with an opening at the top. The handle device 120 is rotatably connected to the trailer body 110. The walking assembly 130 may include at least walking wheels 131 and a walking motor 132 that drives the walking wheels 131 to rotate. The walking motor 132 may be a brushless motor or a hub motor. The power interface 140 is used to connect to a DC power source, which may be a detachable battery pack 141 or an external power supply device. The external power supply device may be an outdoor portable power source that can output DC power. The power interface 140 connects to the battery pack 141 to supply power to the walking motor 132. The controller 150 is electrically connected to at least the walking motor 132. The controller 150 controls the walking motor 132 to rotate, drives the walking wheel 131 to rotate, and assists the electric trailer 100 to move.

[0055] In this embodiment, the handle 120 of the electric trailer 100 also integrates a power-on unit 122. Exemplarily, the power-on unit 122 of the electric trailer 100 is integrated on the grip portion 121 of the handle 120. Furthermore, the power-on unit 122 is not limited to a physical switch or signal switch; any device capable of controlling the opening and closing of current in a circuit is applicable. The controller 150 is at least able to detect the operation signal generated after the power-on unit 122 is operated by the user, and then controls the drive motor 132 to operate according to the detected operation signal. Exemplarily, after the user operates the power-on unit 122 on the handle 120 to start (or power on the system), the battery pack 141 supplies power, the controller 150 controls the drive motor 132 to power on, the controller 150 detects the thrust signal transmitted from the handle 120, and then controls the drive motor 132 to perform operations such as forward movement, turning, deceleration, or acceleration.

[0056] In this embodiment, the electric trailer 100 also includes an electronic control box 160, such as Figure 2 As shown, the electrical control box 160 is installed at the bottom of one end of the frame 111, near the driven wheels 131 and located between the two wheels 131. The drive motor 132 is installed in the electrical control box 160. The electric trailer 100 also includes a main control board 200, which is also housed in the space of the electrical control box 160. The control circuitry on the main control board 200 is capable of controlling the movement of the electric trailer 100. Figure 3 As shown, the control circuit on the main control board 200 may include at least a power interface 140, a controller 150, a drive circuit 210, and a walking motor 132. For example, the main control board 200 may be a PCB board.

[0057] Among them, such as Figure 3 As shown, the drive circuit 210 is connected between the power interface 140 and the walking motor 132. The controller 150 is electrically connected to the drive circuit 210. The battery pack 141 connected to the power interface 140 supplies power to the drive circuit 210, and the controller 150 controls the drive circuit 210 to drive the walking motor 132. The bidirectional current transmission path between the power interface 140, the drive circuit 210, and the walking motor 132 forms a power-on circuit for the walking motor 132, meaning that the DC power input from the power interface 140 can be transmitted to the walking motor 132 through the power-on circuit.

[0058] In this embodiment, the drive circuit 210 is electrically connected to each phase of the stator winding of the walking motor 132 to transmit power current to the stator winding to drive the walking motor 132 to rotate. As one embodiment, such as... Figure 3 As shown, the drive circuit 210 includes multiple switching elements Q1, Q2, Q3, Q4, Q5, and Q6. The gate of each switching element is electrically connected to the controller 150 to receive a control signal from the controller 150. Each drain or source of the switching element is connected to the stator winding of the walking motor 132. The switching elements Q1-Q6 receive the control signal from the controller 150 and change their respective conduction states, thereby changing the current applied to the stator winding of the walking motor 132. In one embodiment, the switching elements Q1-Q6 in the drive circuit 210 may be a three-phase bridge driver circuit including six controllable semiconductor power devices (e.g., FETs, BJTs, IGBTs, etc.), or any other type of solid-state switch, such as an IGBT or BJT.

[0059] It should be noted that after the power-on unit 122 is activated (system powered on), the user may drag the electric trailer 100 down a long downhill slope, or the user may drag the electric trailer 100 forward even when the power-on unit 122 is not activated (i.e., the system is not powered on). In other words, the electric trailer 100 may be forcibly dragged forward or backward by an external force. In this case, the travel motor 132 is driven by an external force, not controlled by the controller 150. Under the drive of the external force, the travel motor 132 rotates and generates electrical energy. In this case, the travel motor 132 can be understood as a generator, capable of producing electricity through rotation. In other embodiments, the travel motor 132 may generate electrical energy when the electric trailer 100 is driven forward or backward by an external force. For example, the travel motor 132 may be a brushless motor or a hub motor; even when the electric trailer 100 is driven forward by an external force, the travel motor 132 can still generate electrical energy.

[0060] In this embodiment, when the power interface 140 is not connected to the battery pack 141, the walking motor 132 can generate electrical energy when dragged by an external force. When the power interface 140 is connected to the battery pack 141, the walking motor 132 can also generate electrical energy when dragged by an external force. In other words, whether the power interface 140 is connected to the battery pack 141 or not does not affect the electrical energy generated by the walking motor 132.

[0061] It should be noted that the electrical energy generated by the travel motor 132 may be fed back to the main control board 200, potentially damaging the main control board 200 or its electronic components, posing a safety hazard, such as causing personal injury or equipment damage. In related technologies, to fully utilize the electrical energy generated by the travel motor 132, when the battery pack 141 is connected to the power interface 140, the controller 150 can control the generated electrical energy to charge the battery pack 141 in reverse, that is, recover the electrical energy generated by the travel motor 132 to the battery pack 141. However, if the travel motor 132 generates excessive electrical energy and charges the battery pack 141 for an extended period, it can lead to overcharging of the battery pack 141, posing a safety hazard. For example, if the electric trailer 100 travels on a downhill section for an extended period, the battery pack 141 may explode due to overcharging, causing personal injury or equipment damage.

[0062] The solutions provided by the embodiments of this application can at least reduce or avoid the occurrence of the above-mentioned situations.

[0063] In one implementation, such as Figure 3 As shown, the electric trailer 100 also includes an energy-consuming device 230 and a circuit-connecting device 220. The circuit-connecting device 220 is located on the power circuit of the travel motor 132 and can disconnect or connect the power circuit of the travel motor 132. The energy-consuming device 230 is also located on the power circuit of the travel motor 132 and can consume the generated electrical energy from the travel motor 132. In this embodiment, both the circuit-connecting device 220 and the energy-consuming device 230 are electrically connected to the controller 150 at least. In this embodiment, when the electric trailer 100 detects that the travel motor 132 is driven by an external force to generate electrical energy, it connects the power circuit of the travel motor 132 through the circuit-connecting device 220, forming a closed loop between the travel motor 132 and the energy-consuming device 230. By consuming the generated electrical energy through the energy-consuming device 230, the generated electrical energy can be prevented from being fed back to the main control board 200, thereby protecting the main control board 200 and the electronic components deployed on it.

[0064] In this embodiment, the circuit switching device 220 includes a relay 221, which is disposed between the walking motor 132 and its drive circuit 210. For example, Figure 3As shown, relay 221 is at least a two-phase relay, such as a two-phase relay or a three-phase relay, respectively connected between two windings of the travel motor 132 and the switching element of its drive circuit 210. That is, the relay can be electrically connected to at least two windings of the travel motor 132, and can control the conduction state of at least two windings of the travel motor 132. In this embodiment, relay 221 is a normally open relay K1, capable of maintaining a normally open state. For example, as... Figure 4 As shown, after the power-on unit 122 is started, the controller 150 can control the normally open relay K1 to switch from the normally open state to the closed state, thus energizing the travel motor 132. Power is supplied by the DC power supply connected to the power interface 140, which drives the travel motor 132 to rotate through the drive circuit 210, normally assisting the electric trailer 100 to move. When the travel motor 23 generates electricity, the relay 221 remains closed, energizing the circuit to consume the generated electricity through the power consumption device 230, or to charge the battery pack 141 to consume the generated electricity, thereby protecting the main control board 200.

[0065] In this embodiment, when the power-on unit 122 is not connected and the system is not powered on, the electric trailer 100 will still generate electrical energy from the travel motor 132 when subjected to external force or on a downhill section. For example, when the controller 150 detects the electrical energy fed back by the travel motor 132, the control relay is in a normally open state, disconnecting the power circuit to prevent the generated electrical energy from damaging the main control board 200, thus ensuring that the electrical energy generated by the travel motor 132 will not damage the main control board 200. It should be noted that the controller 150 can determine whether the electrical energy in the control circuit is generated electrical energy by detecting the magnitude or direction of the current, or the controller 150 can consider the electrical energy transmitted in the control circuit when it detects that the power interface 140 is not connected to the battery pack 141 as generated electrical energy generated by the travel motor 132.

[0066] In this embodiment, as Figure 5 As shown, when the power interface 140 is connected to the battery pack 141, when the controller 150 detects that the walking motor 132 is driven by an external force to generate electrical energy, the controller 150 controls the circuit switching device 220 to connect the power circuit to charge the battery pack 141.

[0067] In one implementation, the controller 150 also acquires the operating parameters of the battery pack 141 and controls the charging and discharging switching of the battery pack 141 based on the operating parameters. See also the following embodiments: Figure 5 and Figure 6As shown, based on the battery pack's operating parameters, the controller 150 determines the battery pack's charging status. If it is overcharged or reaches a preset condition, the controller 150 activates the energy consumption device 230 (connected to the power circuit) to consume the battery pack 141's charge, i.e., discharging the battery pack 141, and simultaneously consuming generated energy. See also... Figure 5 As shown, when it is determined that the battery pack 141 is not in an overcharged state or has not reached a preset condition, the controller 150 disconnects the power consumption device 230, and the generated power continues to charge the battery pack 141. In this embodiment, by controlling the charging and discharging switching of the battery pack 141 according to the operating parameters of the battery pack 141, overcharging of the battery pack 141 by the generated power can be avoided, thereby ensuring that the generated power will not cause overcharging loss to the battery pack 141, better protecting the battery pack 141, and also protecting the main control board 200.

[0068] In this embodiment, a parameter detection module 240 is also provided on the main control board 200. The parameter detection module 240 is electrically connected to the controller 150. The parameter detection module 240 detects the operating parameters of the battery pack 141 and transmits the detected operating parameters to the controller 150 via electrical signals. In some embodiments, the operating parameters of the battery pack 140 include at least one of voltage and temperature. For example, the charging state of the battery pack 141 is determined based on the voltage of the battery pack 141. For instance, if the voltage of the battery pack 141 exceeds a voltage threshold, it is determined that the battery pack 141 is overcharged or has reached a preset condition. The voltage of the battery pack 141 can be obtained by detecting a voltage sensor. The specific value of the voltage threshold can be determined by the nominal voltage of the battery pack 141, or it can be set by the user according to specific needs, which is not limited here. For example, the charging status of the battery pack 141 can also be determined based on its temperature. For instance, if the temperature of the battery pack 141 exceeds a temperature threshold, it is determined that the battery pack 141 is overcharged or has reached a preset condition. The temperature can be obtained by a temperature sensor, and the specific value of the temperature threshold can be determined by the nominal temperature safety range of the battery pack 141, or it can be freely set by the user for protection purposes. In some embodiments, the charging status of the battery pack 141 can also be determined by combining its voltage and temperature. For example, if the voltage of the battery pack 141 exceeds a voltage threshold and the temperature exceeds a temperature threshold, it is determined that the battery pack 141 is overcharged or has reached a preset condition. In other embodiments, the operating parameters of the battery pack 141 can also be its charging current, state of charge (SOC), charging time, etc. The determination process for these operating parameters is described above and will not be repeated here.

[0069] In this embodiment, see Figures 3 to 6As shown, the power consumption device 230 is disposed between the power interface 140 (battery pack) and the drive circuit 210. The power consumption device 230 includes at least one resistor R1 and a first switch K2 connected in series with the resistor R1. Exemplarily, when the first switch K2 is closed, the resistor R1 is connected to the power circuit of the walking motor 132 to consume generated power; when the first switch K2 is open, the resistor R1 is disconnected from the power circuit of the walking motor 132. In one embodiment, the first switch K2 may be a MOSFET, and the controller 150 outputs a pulse width modulation (PWM) wave to control its on / off state. In other embodiments, the first switch K2 may also be a thyristor. The resistance range of the resistor R1 is determined by the overall requirements of the control circuit, such as by the power of the generated power. For example, if the power of the generated electrical energy is approximately in the range of 10W-100W, the resistance value of resistor R1 is in the range of 1Ω-10Ω, or 0.1Ω-20Ω, or 1Ω-6Ω, or 4Ω-10Ω, or 2Ω-8Ω. The rated power of resistor R1 is 20W-400W, or the power range is 20W-400W, or the power range is 20W-100W. For example, resistor R1 is a ceramic resistor, which can be composed of a single resistive element, or two or more resistive elements connected in series, parallel, or a combination of series and parallel.

[0070] In this embodiment, see Figure 5 As shown, after the power-on unit 122 starts, when the controller 150 detects that the walking motor 132 is driven by an external force to generate electrical energy, the relay in the control circuit switching device 220 of the controller 150 closes to connect the power circuit and charge the battery pack 141. At this time, the first switch K2 is open. Simultaneously, the controller 150 detects the operating parameters of the battery pack 141 to determine its charging status. If the controller determines that the battery pack 141 is under preset conditions (such as overcharge), and the voltage of the battery pack 141 exceeds a voltage threshold, see [link to relevant documentation]. Figure 6As shown, the controller closes the first switch K2, connecting resistor R1 to the power circuit, thus forming a closed loop between the walking motor 132 and resistor R1. Resistor R1 consumes the generated electrical energy from the walking motor 132. Simultaneously, it also forms a closed loop between the battery pack 141 and resistor R1, allowing the battery pack 141 to discharge into resistor R1, converting the stored electrical energy into heat. After the battery pack 141 has been discharging for a period, if the battery pack 141 voltage does not exceed the voltage threshold, the controller 150 disconnects the first switch K2, allowing the battery pack 141 to continue charging. This charging and discharging switching process is repeated continuously, ensuring that the generated electrical energy does not cause overcharging damage to the battery pack 141. In one embodiment, the controller 150 outputs a PWM wave to control the on / off state of the first switch K2. Adjusting the duty cycle of the PWM wave can maintain the battery pack 141 voltage near the set voltage threshold, thereby fully utilizing the generated electrical energy and protecting the battery pack 141. In another embodiment, when the temperature of the battery pack 141 exceeds the temperature threshold, the controller 150 turns on the first switch K2 to discharge the battery pack 141 to the resistor R1; when the temperature does not exceed the temperature threshold, the controller 150 turns off the first switch K2 to charge the battery pack 141, so that the temperature of the battery pack 141 is basically maintained near the set temperature threshold, thus avoiding the battery pack 141 from becoming too hot.

[0071] In one implementation, such as Figure 7 As shown, the electric trailer 100 also includes a third switch module 250, which is connected in series with the battery pack 141, i.e., the third switch module 250 is connected in series in the power supply circuit of the battery pack 141. For example, when the drive motor 132 generates electricity, if the controller 150 detects that the voltage of the battery pack 141 has reached a voltage threshold, it controls the third switch module 250 to disconnect, thereby disconnecting the power supply circuit of the battery pack 141 and ceasing charging of the battery pack 141. This allows all the electrical energy generated by the drive motor 132 to be consumed by the resistor R1, thus protecting the battery pack 141. For example, the third switch module 250 may include a second switch K3, which can be a MOSFET or a thyristor; no limitation is made here.

[0072] In this embodiment, as Figure 8As shown, the controller 150, drive circuit 210, relay 221, first switch K2, resistor R1, walking motor 132, and main control board 200 are all housed within the electrical control box 160. The walking motor 132 is located near one end of the electrical control box 160, and its output shaft extends through the electrical control box 160 to the outside of the box to drive the walking wheel 131. In some embodiments, the controller 150, drive circuit 210, relay 221, first switch K2, and resistor R1 are all housed on the main control board 200. Alternatively, all electronic components involved in the control circuit can be considered to be housed on the main control board 200; not all electronic components will be listed here. In other embodiments, the controller 150 and drive circuit 210 are housed on the main control board 200, while the relay 221, first switch K2, and resistor R1 are housed on another control board. The components on this other control board are electrically connected to the components on the main control board 200 to form the control circuit.

[0073] In this embodiment, the walking motor 132 and the electronic components on the main control board 200 are housed in a separate electrical control box 160, resulting in a compact overall structure and space-saving design. Since the walking motor 132 is housed within the electrical control box 160, the storage space of the electrical control box 160 is primarily determined by the shape of the walking motor 132. (See [reference]). Figure 2 As shown, the electrical control box 160 is cylindrical in shape with a semi-circular cross-section. For example, the electrical control box 160 can accommodate at least an existing 52*30 brushless motor (the outer diameter of the motor is about 52 mm and the stacked length of the silicon steel sheets is about 30 mm), or smaller or larger motors. The specific motor model and size are determined by the actual needs of the electric trailer 100 and are not limited here.

[0074] In related technologies, to effectively dissipate the heat generated by the walking motor 132 during operation, a fan 133 is provided at the rear end of the walking motor 132. The fan 133 is driven to rotate by the motor shaft of the walking motor 132 to form an airflow channel. The fan 133 can be a built-in fan of the walking motor 132 or a separate fan. In this embodiment, the various components on the main control board 200 also generate heat during operation. To improve heat dissipation efficiency, the controller 150, drive circuit 210, relay 221, and resistor R1 are arranged in the airflow channel of the fan of the walking motor 132. For example, as shown... Figure 8 As shown, the walking motor 132 is located at the lower right of the main control board 200. Various components on the main control board 200 are positioned within the airflow path of the fan 133 of the walking motor 132. The airflow generated by the fan 133 passes through the surface of the main control board, providing heat dissipation for the various components on the main control board. Specifically, resistor R1 in the power consumption device 230 is a heat-generating element; see [reference needed]. Figure 8As shown, resistor R1 is positioned in the airflow channel and is approximately close to the center of the air vent. The airflow generated by fan 133 passes through the surface of resistor R1 for heat dissipation, preventing the heat generated by resistor R1 from affecting the main control board 200. In this embodiment, as... Figure 8 As shown, the resistor R1 should be positioned as far away from the center of the main control board 200 as possible, and can be located on the left edge of the main control board 200.

[0075] In this embodiment, the electric trailer 100 also includes a buzzer 260. For example... Figure 8 As shown, the buzzer 260 is mounted on the main control board 200 and electrically connected to the controller 150. The buzzer 260 is mainly used for safety warnings, status prompts, and operation feedback, helping users to understand the status in a timely manner and ensuring safety and convenience. For example, as... Figure 8 As shown, since the buzzer 260 has a low temperature resistance rating, the buzzer 260 is placed at the upper right edge of the main control board 200, away from the resistor R1 and away from the airflow channel of the fan 133, so as to avoid the thermal influence of surrounding heat-generating devices and hot air paths on the buzzer 260.

[0076] In this embodiment, as Figure 9 As shown, for better ventilation, the bottom of the electrical control box 160 is provided with at least one air inlet 161 and at least one air outlet 162. The air inlet 161 is located near the air passage of the fan 133, and the air outlet 162 is located near the front end of the fan 133 of the travel motor 132, i.e., at the fan's air outlet passage. For example, as... Figure 9 As shown, the electrical control box 160 is provided with three air inlets 161 and two air outlets 162. One air inlet 161 is located at the air duct, one air inlet 161 is located near the fan 133, and the other air inlet 161 is located near the resistor R1. The two air outlets 162 are located near the air outlet position at the front end of the fan 133. In one embodiment, the air inlets 161 and air outlets 162 are positioned at the lowest point of the bottom of the electrical control box 160, which facilitates the discharge of water that enters the electrical control box 160 through the air inlets 161 or air outlets 162. In another embodiment, to improve ventilation, the air inlets 161 are designed with a labyrinth structure. The position and structure of the air inlets 161 can protect the interior of the electrical control box 160 and also prevent water, dust, and other foreign objects from falling in. In this embodiment, the electrical control box 160 has waterproof and dustproof effects, thereby improving the reliability of the electric trailer 100.

[0077] In this embodiment, as Figure 10 As shown, the structure of the air outlet 162 is set as a flared structure, that is, the cross-section of the air outlet 162 gradually increases along the air outlet path. The flared design can increase the area of ​​the air outlet 162 and also has a certain air guiding effect.

[0078] In this embodiment, as Figure 9 As shown, a drain outlet 163 is provided at the bottom of the electrical control box 160. The drain outlet 163 is basically located at the lowest point of the bottom of the electrical control box 160, which is conducive to draining water from inside the electrical control box 160. In some embodiments, the function of the drain outlet 163 is integrated with the air inlet 161 and / or the air outlet 162, that is, the air inlet 161 and / or the air outlet 162 can also be used as the drain outlet 163 to drain water from inside the electrical control box 160.

[0079] The foregoing has shown and described the basic principles, main features, and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any way, and all technical solutions obtained by equivalent substitution or equivalent transformation fall within the protection scope of this application.

Claims

1. An electric trailer, comprising: The trailer body includes at least the frame; A handle device is connected to the trailer body; The walking assembly includes at least walking wheels and a walking motor that drives the walking wheels to rotate; A power interface is provided for electrical connection to a DC power source to power the walking motor. The controller is electrically connected to at least the walking motor to control the rotation of the walking motor; The walking motor can generate electrical energy by being driven by an external force; The electric trailer also includes an energy consumption device and a circuit switching device, wherein the circuit switching device is configured to disconnect or connect the power circuit of the travel motor, and the energy consumption device is configured to consume the generated electrical energy produced by the travel motor.

2. The electric trailer according to claim 1, characterized in that, The power consumption device includes at least one resistor and a switch connected in series with the resistor.

3. The electric trailer according to claim 2, characterized in that, The circuit switching device includes a relay, which is disposed between the walking motor and its drive circuit.

4. The electric trailer according to claim 1, characterized in that, The circuit switching device includes at least two relays, which are respectively connected between the two windings of the walking motor and the switch of its drive circuit.

5. The electric trailer according to claim 3, characterized in that, The electric trailer also includes a power-on unit. When the power-on unit is not powered on, the relay is disconnected; when the power-on unit is powered on, the relay is closed.

6. The electric trailer according to claim 3, characterized in that, The controller, the drive circuit, the relay, and the resistor are disposed in the airflow channel of the fan of the walking motor.

7. The electric trailer according to claim 3, characterized in that, The electric trailer also includes an electric control box, in which the controller, the drive circuit, the relay, the resistor and the walking motor are all located. The bottom of the electric control box is provided with an air inlet and an air outlet. The air inlet has a labyrinth structure and the air outlet has a horn-shaped structure. The bottom of the electric control box is also provided with a drain outlet.

8. An electric trailer, comprising: The trailer body includes at least the frame; A handle device is connected to the trailer body; The walking assembly includes at least walking wheels and a walking motor that drives the walking wheels to rotate; A power interface for electrically connecting to a battery pack to power the electric trailer; The controller is electrically connected to at least the walking motor and the battery pack; The walking motor can generate electrical energy by being driven by an external force; The controller is configured to: Obtain the operating parameters of the battery pack; and When the walking motor generates the electrical energy, the charging and discharging switching of the battery pack is controlled according to the operating parameters.

9. The electric trailer according to claim 8, characterized in that, The electric trailer also includes an energy-consuming device, which includes at least one resistor and a switch connected in series with the resistor.

10. The electric trailer according to claim 9, characterized in that, The operating parameters include the battery pack voltage. When the voltage exceeds a voltage threshold, the controller turns on the switch to discharge the battery pack to the resistor; when the voltage does not exceed the voltage threshold, the controller turns off the switch to charge the battery pack. or, The operating parameters include the battery pack temperature. When the temperature exceeds a temperature threshold, the controller turns on the switch to discharge the battery pack to the resistor. When the temperature does not exceed the temperature threshold, the controller turns off the switch to charge the battery pack.

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