Power control system, method, electric work machine and electronic device

Abstract

The application provides a power control system, method, electric working machine and electronic equipment, and belongs to the technical field of electric working machines, wherein the power control system comprises an emergency stop switch, a power control module, a DCDC converter, a vehicle controller and a key switch; the vehicle controller is used for outputting a first control signal to the power control module when monitoring a switch signal of the key switch; the power control module is used for providing a first control electric for the DCDC converter and the vehicle controller when the emergency stop switch is opened; and the DCDC converter is controlled based on the first control signal to output a second control electric to each motor controller and a battery management system. The application is used to solve the defects that the existing technology adopts the mode of connecting to a constant power source to avoid burning the battery control relay and the high-voltage loop of the controller when the power supply of the electric working machine adopting a high-voltage platform is turned on or turned off through the key switch, and the power battery is damaged due to long-term low current power consumption.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric working machines, in particular to a power supply control system and method, an electric working machine and an electronic device. BACKGROUND

[0002] At present, lithium batteries are widely used. When lithium batteries are used as power sources of electric working machines, the power-on and power-off of the lithium batteries need to be managed by a battery management system (BMS). However, with the diversity of voltage platforms of electric working machines, high-voltage platforms have been widely used, for example, the 80V-600V high-voltage platform of a forklift.

[0003] However, for low-voltage electric working machines such as forklifts, sightseeing vehicles and old-age walking vehicles, the traditional control method is to directly turn on or turn off the power source by a key switch. This control method is easy to burn out the battery control relay and the high-voltage loop of the controller. Therefore, the current control method is to connect the main controller to the normal power source and use the key signal as a wake-up signal to solve the above problems. However, the use of the normal power source has the risk of low current power consumption and damage to the lithium battery during long-term storage. SUMMARY

[0004] The present application provides a power supply control system and method, an electric working machine and an electronic device to solve the defect that the existing technology uses a normal power source to avoid burning out the battery control relay and the high-voltage loop of the controller when turning on or turning off the power source of an electric working machine using a high-voltage platform by a key switch, which causes long-term low current power consumption and damage to the power battery.

[0005] The present application provides a power supply control system, comprising: an emergency stop switch connected to a power battery of an electric working machine, a power supply control module, a DCDC converter and a vehicle controller connected in sequence to the emergency stop switch, and a key switch connected to the DCDC converter;

[0006] The vehicle controller is connected to the key switch and is configured to output a first control signal to the power supply control module when a switch signal of the key switch is monitored, the switch signal being generated when the key switch is turned on and disappearing when the key switch is turned off;

[0007] The power supply control module is configured to continuously provide first control electricity to the DCDC converter and the vehicle controller based on the power battery when the emergency stop switch is opened, and control the DCDC converter to convert high-voltage electricity output by the power battery into low-voltage electricity and output the low-voltage electricity as second control electricity to each motor controller and the battery management system of the electric working machine based on the first control signal.

[0008] The power supply control system according to the application, the emergency stop switch is connected with the DCDC converter, and is configured to disconnect the power battery from the power supply control module and send an emergency stop instruction to the DCDC converter when the emergency stop switch is closed.

[0009] The DCDC converter is configured to stop outputting the second control electricity after a first preset time delay in response to the emergency stop instruction.

[0010] The vehicle controller is further configured to stop outputting the first control signal when the control signal disappears, and output a second control signal to the power supply control module after a second preset time delay.

[0011] The power supply control module is further configured to stop outputting the first control electricity based on the second control signal.

[0012] After the power supply control module stops outputting the first control electricity based on the second control signal, the power supply control module is further configured to resume outputting the first control electricity to the DCDC converter and the vehicle controller after the emergency stop switch is closed and reopened.

[0013] The power supply control system according to the application further comprises a seat switch connected with the DCDC converter.

[0014] The seat switch is configured to monitor whether a driver leaves a seat of the electric working machine and send a monitoring signal to the vehicle controller.

[0015] The vehicle controller is further configured to stop outputting the first control signal when the switch signal exists and the driver leaves the seat for more than a third preset time based on the monitoring signal.

[0016] The power supply control system according to the application, the vehicle controller is connected with a battery management system of the electric working machine, and is configured to acquire current output of the power battery from the battery management system when the switch signal exists, and stop outputting the first control signal when the electric working machine is determined to be in a stop state for more than a fourth preset time based on the current output.

[0017] According to the power supply control system, the vehicle controller is connected to the traveling motor of the electric working machine, and is configured to acquire the traveling state of the electric working machine by the traveling motor when the switch signal exists, and stop outputting the first control signal when the traveling state of the electric working machine is determined to be stopped and the time length reaches the fifth preset time length.

[0018] The application further provides an electric working machine comprising the power supply control system.

[0019] The application further provides a power supply control method, comprising:

[0020] When the emergency stop switch of the electric working machine is opened, the first control electric is continuously provided for the DCDC converter and the vehicle controller by the power battery of the electric working machine;

[0021] Based on the first control signal, the DCDC converter of the electric working machine is controlled to convert the high-voltage electric output by the power battery into low-voltage electric, and the low-voltage electric is output as the second control electric to the motor controller and the battery management system of the electric working machine.

[0022] The first control signal is generated when the vehicle controller monitors the switch signal of the key switch of the electric working machine, the switch signal is generated when the key switch is opened, and disappears when the key switch is closed.

[0023] The application further provides an electronic device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, and the processor executes the program to realize the power supply control method.

[0024] The application provides a power supply control system, method, electric working machine and electronic equipment, wherein the power supply control system comprises an emergency stop switch connected with a power battery of the electric working machine, a power supply control module, a DCDC converter and a vehicle controller connected with the emergency stop switch in sequence, and a key switch connected with the DCDC converter; through the setting of the power supply control module, when the emergency stop switch is opened, the power supply control module can continuously provide first control electricity for the DCDC converter and the vehicle controller by using the power battery, so that the burning of the battery control relay and the controller high-voltage loop caused by directly turning off the power supply by the key switch is avoided. Through the connection of the vehicle controller with the key switch, when the vehicle controller monitors the switch signal of the key switch, the vehicle controller can output a first control signal to the power supply control module, and then the power supply control module can control the DCDC converter to convert the high-voltage electricity output by the power battery into low-voltage electricity, and output the low-voltage electricity as second control electricity to the motor controllers and the battery management system of the electric working machine, which on the one hand ensures the quick start of the control system when the electric working machine is started, and on the other hand, the power supply control module, the DCDC converter and the vehicle controller are all in a low-power consumption state when the electric working machine is not started, so that the power consumption of the power battery is reduced, and the use cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the application or prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can also be obtained by those skilled in the art without any creative effort.

[0026] Figure 1 is a structural schematic diagram of a power supply control system provided by an embodiment of the application;

[0027] Figure 2 is a running principle schematic diagram of the power supply control system provided by the embodiment of the application applied to an electric forklift;

[0028] Figure 3 is a flow schematic diagram of a power supply control method provided by an embodiment;

[0029] Figure 4 is a structural schematic diagram of an electronic equipment provided by the application;

[0030] 1: lithium battery pack and BMS; 2: emergency stop switch; 3: power supply control module; 4: vehicle controller; 5: seat switch; 6: key switch; 7: DCDC converter; 8: power supply control box; 9: traveling motor controller; 10: oil pump motor controller. DETAILED DESCRIPTION

[0031] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the present application will be described clearly and completely below with reference to the drawings in the present application. Obviously, the described embodiments are only part of, rather than all of, the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0032] It can be understood that, due to the advantages of rich raw materials, low cost, green and no pollution, etc., lithium batteries have been widely applied in the field of power batteries of electric working machines.

[0033] Taking an electric forklift as an example, when lithium batteries are used as power sources, the lithium batteries need to be managed by BMS when being powered on and powered off. And with the diversity of voltage platforms selected by electric forklifts, 80V-600V high voltage platforms are widely used. However, low-voltage vehicles such as forklifts and sightseeing vehicles do not have low-voltage storage batteries to provide control power for various controllers as new energy vehicles do. Therefore, the traditional forklifts use the control mode of directly turning on or turning off the power source by the key switch to control the power source, which has great safety risks for electric forklifts using high voltage platforms, and is easy to burn out the battery control relay and the high voltage loop of the controller. And for the power control mode of connecting to the constant power source and using the key signal as the wake-up signal, although it can avoid the safety risks caused by directly turning on or turning off the power source by the key switch, it needs to provide constant power for the travel motor controller, the oil pump motor controller and other controllers of the electric forklift, which consumes a large amount of electricity, and there is a risk of low current power consumption when in long-term storage, which may cause damage to the lithium battery pack.

[0034] Therefore, the present application provides a power control system for power management of electric working machines such as electric forklifts by a power control module and a vehicle controller. After the emergency stop switch is turned on, only the power control module, the vehicle controller and the DCDC converter need to be provided with constant power, thereby reducing the low current power consumption of the electric working machine when it is stopped, and ensuring the quick start of the control system.

[0035] The power control system, method, electric working machine and electronic equipment of the present application will be described below. Figures 1 to 4 The power control system, method, electric working machine and electronic equipment of the present application will be described below.

[0036] Figure 1 FIG. 1 is a structural schematic diagram of the power control system provided by the embodiments of the present application.

[0037] As shown in FIG. 1, the power control system of the present application comprises a power control module 1, a vehicle controller 2 and a DCDC converter 3. Figure 1As shown, the power control system comprises: an emergency stop switch connected with a power battery of the electric working machine, a power control module, a DCDC converter and a vehicle controller connected with the emergency stop switch in sequence, and a key switch connected with the DCDC converter;

[0038] The vehicle controller is connected with the key switch, and is configured to output a first control signal to the power control module when a switch signal of the key switch is monitored, the switch signal being generated when the key switch is turned on and disappearing when the key switch is turned off.

[0039] The power control module is configured to continuously provide a first control electric to the DCDC converter and the vehicle controller based on the power battery when the emergency stop switch is turned on, and control the DCDC converter to convert high-voltage electric output by the power battery into low-voltage electric and output the low-voltage electric as a second control electric to each motor controller and a battery management system of the electric working machine based on the first control signal.

[0040] Specifically, by connecting the power battery with the power control module through the emergency stop switch, and then connecting the power control module with the DCDC converter and the vehicle controller in sequence, when the emergency stop switch is turned on, the power control module can supply power to the DCDC converter based on the current output by the power battery, and then the DCDC converter converts the high-voltage electric into low-voltage electric and outputs the low-voltage electric to the vehicle controller, so that the power control module, the DCDC converter and the vehicle controller are always in a low-power consumption working state when the emergency stop switch is not turned off.

[0041] It can be understood that because the key switch is connected with the DCDC converter, when the key switch is turned on, the DCDC converter can output a first control electric to the key switch, so that the key switch can continuously output a switch signal, and when the key switch is turned off, the switch signal disappears.

[0042] More specifically, by connecting the vehicle controller with the key switch, and the vehicle controller being in a low-power consumption working state, the vehicle controller can determine the real-time state of the key switch. Therefore, when the key switch is turned on, by outputting a first control signal from the vehicle controller to the power control module, the power control module can control the DCDC converter to convert high-voltage electric output by the power battery into low-voltage electric, and then output the low-voltage electric as a second control electric to each motor controller (such as a pump motor controller, a traveling motor controller, etc.) and the BMS of the electric working machine, so that each motor controller and the BMS can start after being powered, and then the BMS controls the power battery to output high-voltage electric to the pump motor, the traveling motor, etc., thereby completing the power-on of the electric working machine.

[0043] Further, the DCDC converter also outputs the second control electric to a display screen, a fan, an air conditioner, a signal, etc. of the electric working machine.

[0044] Further, in order to improve the safety of the power control system, the second control electricity output by the DCDC converter can also pass through the fuse box, and the fuse box outputs the second control electricity to each motor controller and the BMS.

[0045] The power control system provided by the embodiment of the application can reduce power consumption and ensure that the control system of the electric working machine can quickly respond when the key switch is opened, thereby improving user experience.

[0046] According to the above embodiment, the emergency stop switch is connected to the DCDC converter, and is used to disconnect the power battery and the power control module when the emergency stop switch is closed, and send an emergency stop instruction to the DCDC converter.

[0047] The DCDC converter is used to stop outputting the second control electricity after a first preset time delay in response to the emergency stop instruction.

[0048] In the embodiment, when the emergency stop switch is closed, the emergency stop switch disconnects the power battery and the power control module, so that the power control module stops outputting the first control electricity. By connecting the emergency stop switch to the DCDC converter, the emergency stop switch can send an emergency stop instruction to the DCDC converter when the emergency stop switch is closed, so that the DCDC converter stops outputting the second control electricity after a first preset time delay (for example, 10 seconds, 15 seconds, etc.), thereby ensuring that the oil pump motor controller, the traveling motor controller and other controllers are safely powered off, and the electric working machine can be stopped in time, thereby improving the use safety of the electric working machine.

[0049] According to the above embodiment, the vehicle controller is also used to stop outputting the first control signal when the control signal disappears, and output a second control signal to the power control module after a second preset time delay.

[0050] The power control module is also used to stop outputting the first control electricity based on the second control signal.

[0051] It can be understood that, since the power control module and the vehicle controller are in a continuous low-power state, the power of the power battery will be consumed. When the electric working machine is stored for a long time, there is a risk that the power of the power battery will be depleted, thereby damaging the power battery.

[0052] In the embodiment, when the vehicle controller monitors that the control signal disappears, that is, the key switch is turned off, the first control signal is stopped from being output, the power control module can be stopped from controlling the DCDC converter to output the second control signal to each controller of the electric working machine and the BMS, so that the electric working machine is powered off, the power consumption is reduced, and the second preset time period can be set based on the use rule of the electric working machine to determine whether the electric working machine is in a long-term storage state. For example, when the use rule of the electric working machine is from 8 am to 6 pm every day, the second preset time period can be set to 20 h, 24 h, etc. Then, the vehicle controller outputs the second control signal to the power control module after the delay of the second preset time period, so that the power control module can stop outputting the first control signal based on the second control signal. Thus, after the second preset time period, the vehicle controller and the DCDC converter are also stopped, thereby avoiding damage to the power battery caused by low current consumption when the electric working machine is in long-term storage, and avoiding the trouble of repeatedly operating the emergency stop switch to power on and off the electric working machine.

[0053] Based on the above-mentioned embodiment, after the first control signal is stopped based on the second control signal, the power control module is further configured to resume outputting the first control signal to the DCDC converter and the vehicle controller after the emergency stop switch is turned off and turned on again.

[0054] It can be understood that after the first control signal is stopped based on the second control signal, the DCDC converter and the vehicle controller are in a powered-off state. By actuating the emergency stop switch once, the power control module can resume providing the first control signal to the DCDC converter and the vehicle controller based on the power battery, so that the electric working machine can be normally used.

[0055] Based on the above-mentioned embodiment, the power control system further comprises a seat switch connected to the DCDC converter.

[0056] The seat switch is configured to monitor whether the driver leaves the seat of the electric working machine and send a monitoring signal to the vehicle controller.

[0057] The vehicle controller is further configured to stop outputting the first control signal when the switch signal exists and the time period during which the driver leaves the seat exceeds a third preset time period based on the monitoring signal.

[0058] In the embodiment, by connecting the seat switch with the DCDC converter, the seat switch can monitor in real time whether the driver leaves the seat of the electric working machine, and after sending the monitoring signal to the vehicle controller, the vehicle controller can stop outputting the first control signal when it is determined that the driver has left the seat for more than a third preset time (for example, 30 minutes, 1 hour, 2 hours, etc.) and the key switch is on, thereby avoiding power loss caused by the driver forgetting to turn off the key switch.

[0059] In a specific embodiment, the seat switch can be a weight sensor or a pressure sensor, so that the vehicle controller can determine whether the driver has left the seat of the electric working machine based on the weight or pressure change on the seat.

[0060] Based on the above-mentioned embodiment, the vehicle controller is connected to the battery management system of the electric working machine, and is configured to obtain the current output of the power battery from the battery management system when the switch signal exists, and stop outputting the first control signal when it is determined that the electric working machine is in a stop state for a fourth preset time based on the current output.

[0061] It can be understood that when the current output of the power battery is small or there is no output, it means that the electric working machine is in a standby state, and if the key switch is not turned off, the controllers will continue to consume power, causing waste.

[0062] In the embodiment, by connecting the vehicle controller to the BMS of the electric working machine, the vehicle controller can determine in real time whether the electric working machine is in a stop state based on the current output of the power battery obtained by the battery management system when the key switch is on, and stop outputting the first control signal when the stop state lasts for a fourth preset time (for example, 30 minutes, 1 hour, 2 hours, etc.), thereby avoiding power waste.

[0063] Based on the above-mentioned embodiment, the vehicle controller is connected to the driving motor of the electric working machine, and is configured to obtain the driving state of the electric working machine from the driving motor when the switch signal exists, and stop outputting the first control signal when it is determined that the electric working machine is in a stop state and the time reaches a fifth preset time.

[0064] It can be understood that when the speed of the driving motor of the electric working machine is zero or close to zero for a long time, it also means that the electric working machine is in a standby state.

[0065] In this embodiment, by connecting the vehicle controller to the driving motor of the electric working machine, the vehicle controller can determine whether the electric working machine is in the stop driving state in real time based on the obtained speed of the driving motor when the key switch is in the open state, and stop outputting the first control signal when the duration of the stop driving state reaches the fifth preset duration (for example, 30 minutes, 1 hour, 2 hours, etc.), thereby avoiding waste of electric quantity.

[0066] Figure 2 Taking the electric forklift as an example, the control principle diagram of the power supply control system provided in the above embodiment of the application is shown in the figure, wherein the first control voltage and the second control voltage are marked as start B+ and work B+ respectively, and the control voltage is usually 12V. The first control signal and the second control signal are marked as control signal 3 and control signal 4 respectively.

[0067] In the BMS, a pre-charging circuit is arranged to pre-charge the BMS control circuit to the motor controller, so as to avoid capacitor power-on impact and improve reliability. In order to improve safety, a power supply control box is added in the system.

[0068] When the electric forklift is started, the B+ of the lithium battery pack and the BMS1 outputs a B+ signal to the power supply control module 3 when the emergency stop switch 2 is opened, the power supply control module 3 outputs a start B+ signal to the DCDC converter 7, and the DCDC 7 outputs a start 12V+ signal to the vehicle controller 4. When the key switch 6 is opened, the vehicle controller 4 monitors the switch signal of the key switch 6 and outputs a control signal 3 to the power supply control module 3, the power supply control module 3 sends a work B+ signal to the DCDC converter 7 in response to the control signal 3, and the DCDC converter 7 converts the high-voltage power of the lithium battery pack into low-voltage power as a work 12V+ signal and outputs it to the power supply control box 8. The work 12V+ signal is output to the walking motor controller 9, the oil pump motor controller 10 and the BMS by the power supply control box 8. At this time, the walking motor controller 9, the oil pump motor controller 10 and the BMS are powered on, the BMS controls the lithium battery pack to supply power to the oil pump motor, the walking motor and the like, thereby completing the power-on process.

[0069] When the electric forklift is powered off, the vehicle controller 4 monitors the disappearance of the switch signal of the key switch 6 and stops outputting the control signal 3 to the power supply control module 3, so that the power supply control module 3 stops outputting the work B+ signal to the DCDC converter 7. At this time, the DCDC converter 7 stops outputting the work 12V+ signal after a certain time duration, for example, 20s, or immediately stops outputting the work 12V+ signal, and outputs the start 12V+ signal to the power supply control box 8 for a certain time duration, for example, 20s, thereby ensuring that the walking motor controller 9, the oil pump motor controller 10 and the BMS are safely powered off.

[0070] When an emergency stop is needed in an emergency situation, the emergency stop switch 2 is pressed, the B+ signal output to the power control module 3 is stopped, the power control module 3 stops outputting the start B+ signal to the DCDC converter 7, the emergency stop switch 2 outputs the emergency stop B+ signal to the DCDC converter 7, and the DCDC converter 7 stops outputting the working 12V+ signal to the power control box 7 after a delay preset time, for example, 20s, so that the travel motor controller 9, the oil pump motor controller 10, etc. have 20s of time to safely power down.

[0071] When the key switch 6 is on and the driver is away for a long time, the vehicle controller 4 can determine this situation based on the seat switch signal output by the seat switch 5, so the control signal 3 output to the power control module 3 is stopped, so that the power control module 33 controls the DCDC converter 7 to stop outputting the working 12V+ signal. It should be noted that the control based on the BMS or travel motor signal is similar to the principle of the seat switch signal based on the seat switch, which is not described here.

[0072] When the electric forklift needs to be stored for a long time, the vehicle controller 4 can start timing after the key switch 6 is turned off, and output the control signal 4 to the power control module 3 to stop outputting the start B+ signal when it is determined that the key switch 6 signal has not been monitored again within a certain time, for example, 24h, so that the electric forklift is completely powered down. When the electric forklift needs to be restarted, the power control module 3 can output the start B+ signal again by actuating the emergency stop switch once.

[0073] Based on Figure 2 As shown in the application of the power control system to the electric forklift, the power control system provided by the embodiment of the application can realize whole vehicle power management and improve vehicle stability. At the same time, it ensures that the control system can be quickly started when the electric working machine is started, and all electrical components are powered off when the electric working machine is stopped, without generating heat insertion hazards; effectively avoids the occurrence of battery depletion hazards when the lithium battery is stored for a long time; the whole vehicle electrical system only needs one DCDC converter, avoiding the addition of an extra DCDC converter inside the battery, reducing application costs; in addition, the vehicle controller can detect that the person has left the vehicle, or determine that the vehicle is in a parked power-on state according to the running condition of the vehicle, output a signal to the power control module in this case, and safely power down the whole vehicle through the power control module, thereby avoiding power loss.

[0074] Based on the same overall inventive concept, the application also protects an electric working machine comprising the power control system provided by any of the above embodiments.

[0075] In the embodiment, the electric working machine can be a low-voltage vehicle such as an electric forklift, a forklift, a sightseeing vehicle, etc., or a new energy vehicle using the power supply control system provided by the embodiment to replace a low-voltage storage battery.

[0076] Based on the same general inventive concept, as Figure 3 indicated, the application also protects a power supply control method executed in the power supply control module, which mainly includes the following steps:

[0077] 301. When the emergency stop switch of the electric working machine is opened, the power battery of the electric working machine continuously provides the first control electricity to the DCDC converter and the vehicle controller;

[0078] 302. Based on the first control signal, the DCDC converter of the electric working machine converts the high-voltage electricity output by the power battery into low-voltage electricity, and outputs the low-voltage electricity as the second control electricity to the motor controller and the battery management system of the electric working machine;

[0079] The first control signal is generated when the vehicle controller detects the switch signal of the key switch of the electric working machine, and the switch signal is generated when the key switch is opened and disappears when the key switch is closed.

[0080] In the embodiment, the power supply control module can continuously provide the first control electricity to the DCDC converter and the vehicle controller when the emergency stop switch is opened, avoiding the burning of the battery control relay and the high-voltage loop of the controller caused by directly turning off the power supply through the key switch. At the same time, after the vehicle controller outputs the first control signal to the power supply control module, the power supply control module can control the DCDC converter to convert the high-voltage electricity output by the power battery into low-voltage electricity based on the first control signal, and output the low-voltage electricity as the second control electricity to the motor controller and the battery management system of the electric working machine. On the one hand, it ensures the rapid start of the control system when the electric working machine is started, and on the other hand, the power supply control module, the DCDC converter and the vehicle controller are in a low-power state when the electric working machine is not started, reducing the consumption of the power battery, and thus reducing the use cost.

[0081] Figure 4 An example of an electronic device is shown in the physical structure diagram, Figure 4As shown, the electronic device can include a processor 410, a communications interface 420, a memory 430, and a communications bus 440, wherein the processor 410, the communications interface 420, and the memory 430 complete mutual communication through the communications bus 440. The processor 410 can invoke a logic instruction in the memory 430 to execute a power control method, the method comprising: when an emergency stop switch of an electric working machine is opened, continuously providing first control electricity to a DCDC converter and a vehicle controller through a power battery of the electric working machine; based on a first control signal, controlling the DCDC converter of the electric working machine to convert high-voltage electricity output by the power battery into low-voltage electricity, and outputting the low-voltage electricity as second control electricity to each motor controller and a battery management system of the electric working machine; wherein the first control signal is generated when the vehicle controller monitors a switch signal of a key switch of the electric working machine, the switch signal is generated when the key switch is opened, and disappears when the key switch is closed.

[0082] In addition, the logic instruction in the memory 430 described above can be implemented in the form of a software function unit and sold or used as an independent product when used, and can be stored in a computer readable storage medium. Based on such understanding, the technical solutions of the present application essentially or the part that contributes to the prior art or part of the technical solutions can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a plurality of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the method described in various embodiments of the present application. The foregoing storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various program code storage media.

[0083] In another aspect, the present application also provides a computer program product, which comprises a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, enable the computer to perform the power control method provided by any of the above methods, the method comprising: continuously providing, by a power battery of an electric working machine, a first control electricity to a DCDC converter and a vehicle controller when an emergency stop switch of the electric working machine is opened; based on a first control signal, controlling the DCDC converter of the electric working machine to convert high-voltage electricity output by the power battery into low-voltage electricity, and outputting the low-voltage electricity as a second control electricity to each motor controller and a battery management system of the electric working machine; wherein the first control signal is generated when the vehicle controller monitors a switch signal of a key switch of the electric working machine, the switch signal being generated when the key switch is opened and disappearing when the key switch is closed.

[0084] In another aspect, the present application also provides a non-transitory computer readable storage medium, which stores a computer program, the computer program being executed by a processor to implement the power control method provided by any of the above methods, the method comprising: continuously providing, by a power battery of an electric working machine, a first control electricity to a DCDC converter and a vehicle controller when an emergency stop switch of the electric working machine is opened; based on a first control signal, controlling the DCDC converter of the electric working machine to convert high-voltage electricity output by the power battery into low-voltage electricity, and outputting the low-voltage electricity as a second control electricity to each motor controller and a battery management system of the electric working machine; wherein the first control signal is generated when the vehicle controller monitors a switch signal of a key switch of the electric working machine, the switch signal being generated when the key switch is opened and disappearing when the key switch is closed.

[0085] The device embodiments described above are merely illustrative, wherein the units described as separate components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., they can be located in one place, or distributed on multiple network units. Part or all of the modules can be selected to achieve the purpose of the present embodiment scheme according to actual needs. Those skilled in the art can understand and implement it without creative labor.

[0086] Those skilled in the art can clearly understand the technical solutions of the various embodiments from the above description of the embodiments, and the various embodiments can be implemented by means of software with the necessary general hardware platforms, and of course, can also be implemented by hardware. Based on such understanding, the above technical solutions, essentially or in other words, the part of the prior art that makes a contribution, can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as a ROM / RAM, a magnetic disk, an optical disk, and the like, and includes a number of instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in the various embodiments or some parts of the embodiments.

[0087] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, rather than limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for some technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A power control system, characterized by, The application relates to an emergency stop switch connected with a power battery of an electric working machine, a power supply control module, a DCDC converter and a vehicle controller connected with the emergency stop switch in sequence, and a key switch connected with the DCDC converter. The vehicle controller is connected with the key switch and is used for outputting a first control signal to the power supply control module when a switch signal of the key switch is monitored, the switch signal being generated when the key switch is opened and disappearing when the key switch is closed. The power supply control module is used for continuously providing first control electricity to the DCDC converter and the vehicle controller based on the power battery when the emergency stop switch is opened, and controlling the DCDC converter to convert high-voltage electricity output by the power battery into low-voltage electricity and output the low-voltage electricity as second control electricity to each motor controller and a battery management system of the electric working machine based on the first control signal. The emergency stop switch is connected with the DCDC converter and is used for disconnecting the power battery from the power supply control module and sending an emergency stop instruction to the DCDC converter when the emergency stop switch is closed. The DCDC converter is used for stopping the output of the second control electricity after a first preset time delay in response to the emergency stop instruction. The vehicle controller is further used for stopping the output of the first control signal when the control signal disappears, i.e. when the key switch is closed, so that the power supply control module stops controlling the DCDC converter to output second control electricity to each controller and the BMS of the electric working machine, thereby making the electric working machine power off, reducing power consumption, and outputting a second control signal to the power supply control module after a second preset time delay, the second preset time being set based on the use rule of the electric working machine and being used for determining whether the electric working machine is in a long-term storage state. The power supply control module is further used for stopping the output of the first control electricity based on the second control signal, so that the vehicle controller and the DCDC converter also stop working after the second preset time, thereby avoiding damage to the power battery caused by low current power consumption when the electric working machine is in a long-term storage state. After the power supply control module stops the output of the first control electricity based on the second control signal, the power supply control module is further used for resuming the output of the first control electricity to the DCDC converter and the vehicle controller after the emergency stop switch is closed and reopened. The application further relates to a seat switch connected with the DCDC converter.

2. The power control system of claim 1, wherein The seat switch is used for monitoring whether a driver leaves a seat of the electric working machine and sending a monitoring signal to the vehicle controller. The vehicle controller is further used for stopping the output of the first control signal when the switch signal exists and the time length during which the driver leaves the seat exceeds a third preset time length based on the monitoring signal. ​ ​ 3. The power control system of claim 1, wherein The vehicle controller is connected to a battery management system of the electric working machine, configured to acquire current output condition of the power battery from the battery management system when the switch signal exists, and stop outputting the first control signal when it is determined based on the current output condition that the electric working machine is in a stop state for a fourth preset time length.

4. The power control system of claim 1, wherein The vehicle controller is connected to a driving motor of the electric working machine, configured to acquire driving state of the electric working machine from the driving motor when the switch signal exists, and stop outputting the first control signal when it is determined that the driving state of the electric working machine is in a stop state for a fifth preset time length.

5. An electric work machine characterized by comprising: The power supply control system comprises the electric working machine and the vehicle controller.

6. A power supply control method characterized by comprising: The power supply control system comprises the electric working machine and the vehicle controller. When an emergency stop switch of the electric working machine is opened, the DCDC converter and the vehicle controller are continuously supplied with first control electricity from a power battery of the electric working machine; Based on the first control signal, the DCDC converter of the electric working machine is controlled to convert high-voltage electricity output by the power battery into low-voltage electricity, and output the low-voltage electricity as second control electricity to each motor controller and battery management system of the electric working machine; The first control signal is generated when the vehicle controller monitors a switch signal of a key switch of the electric working machine, the switch signal is generated when the key switch is opened, and disappears when the key switch is closed.

7. An electronic device comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, The processor implements the power supply control method of claim 6 when executing the program.

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