Aerial work platform electric conversion system and control method

Abstract

This invention discloses an electrification retrofit system and control method for aerial work platforms, comprising: a VCU (Vehicle Control Unit) communicating with the control components; an electric unit communicating with the VCU; and a CTC (Control Center Tunneling) whose input is connected to the VCU's CAN bus and whose output is connected to the electric unit. The CTC is also connected to a first hydraulic circuit via a first signal converter and a first pressure relief valve, and to a second hydraulic circuit via a second signal converter and a second pressure relief valve. The first and second signal converters are used to convert the control signals output by the CTC into action signals for the first and second pressure relief valves, respectively. This invention achieves coordinated processing of the original vehicle control signals and the electric system optimization strategy through the CTC. It finely controls the motor speed to reduce energy consumption during lifting, lowering, and rotating operations, and controls the hydraulic pump to unload and achieve concentrated power output during escape or climbing operations. This balances the economy of daily operations with the passability of special working conditions, realizing a standardized design for electrification retrofitting.

Description

Technical Field

[0001] This invention relates to the field of aerial work platform technology, and in particular to an electrification retrofit system and control method for aerial work platforms. Background Technology

[0002] Aerial work platforms are widely used for high-altitude operations in construction, municipal engineering, and power industries. Traditional aerial work platforms mostly use internal combustion engines as their power source. However, with increasing environmental protection requirements and the development of new energy technologies, converting them to electric systems has become an important trend.

[0003] In existing technologies, the electrification of aerial work platforms usually adopts the "engine replacement" method, which replaces the original vehicle engine with a battery-driven motor system, and directly forwards the control signals from the original vehicle's VCU to the MCU of the electric system to achieve basic function replacement.

[0004] However, this simple direct signal connection method faces multiple technical challenges in practical applications: First, there are many different models of used aerial work platforms, varying in age and condition, and the control logic of the original VCUs differs greatly. Customizing and modifying components for each machine would be too costly and make standardized mass production difficult. Second, the original VCU control logic is designed for internal combustion engines and does not consider the working characteristics of electric systems. For example, under light load conditions such as boom descent, the VCU still maintains the same high-speed command as under lifting conditions, causing the motor to idle at high speed, resulting in wasted energy and shortened range. At the same time, when the vehicle is stuck in mud and needs to get out or needs instantaneous high power to climb hills, the electric system cannot provide sufficient power output. If a high-power motor is configured to meet extreme conditions, the motor efficiency under normal conditions will be reduced, increasing cost and weight. In addition, if the above-mentioned personalized control functions are integrated into the MCU, the MCU needs to be adapted to the control logic of different models, resulting in complex MCU design and numerous software versions, which is not conducive to mass production and maintenance. Summary of the Invention

[0005] The present invention aims to solve the above-mentioned problems in the electrification retrofitting of aerial work platforms in the prior art, and to provide an electrification retrofitting system and control method for aerial work platforms that can achieve standardized production, reduce energy consumption, and improve the ability to pass through special working conditions.

[0006] An electric conversion system for aerial work platforms according to the present invention includes:

[0007] VCU, whose input terminal is communicatively connected to the control unit; An electric unit, communicatively connected to the VCU, is used to provide power; The CTC has its input terminal connected to the CAN bus of the VCU and its output terminal connected to the electric unit.

[0008] This embodiment establishes a standardized electrification retrofit architecture by setting up a CTC to connect the VCU and the electric unit, enabling the system to adapt to different models. At the same time, the CTC's intervention in the signals provides a hardware foundation for subsequent energy-saving control and centralized power control, realizing the universal design of the electric system.

[0009] In one or more embodiments of the present invention, the CTC is connected to a first oil circuit via a first signal converter and a first pressure relief valve, and the CTC is also connected to a second oil circuit via a second signal converter and a second pressure relief valve; the first signal converter and the second signal converter are respectively used to convert the control signal output by the CTC into the action signals of the first pressure relief valve and the second pressure relief valve.

[0010] This embodiment connects the CTC to two oil circuits and controls the pressure relief valve through a signal converter, enabling the CTC to indirectly control the unloading state of the hydraulic system and providing an execution channel for centralized power control.

[0011] In one or more embodiments of the present invention, a first hydraulic pump and a second hydraulic pump connected in parallel are further included, both of which are connected to the electric unit; the first hydraulic pump is connected to the lower body motor via a first oil circuit, and the proportional directional valve is disposed on the first oil circuit; the second hydraulic pump is connected to the upper body motor and the cylinder via a second oil circuit, and the proportional valve is disposed on the second oil circuit; the VCU is also connected to the proportional directional valve and the proportional valve respectively; the control terminals of the first signal converter and the second signal converter are only connected to the CTC.

[0012] This embodiment, through a clearly defined hydraulic system design with dual pumps operating in parallel and with distinct functions, allows for independent control of getting on and off the vehicle without interference, improving system control accuracy and response speed. It also provides a physical basis for subsequent centralized power control. The VCU is directly connected to the proportional directional valve and proportional valve, preserving the original vehicle's control over the actuators and hydraulic system. This ensures that the original vehicle's basic operating functions remain unaffected after electrification retrofitting, requiring no significant modifications to the hydraulic system. The signal converter is controlled only by the CTC, avoiding conflicts with the original vehicle's VCU and simplifying the control logic.

[0013] In one or more embodiments of the present invention, the electric unit includes an MCU, a main controller, a frequency converter, a motor, a BMS, and a battery; wherein the battery is electrically connected to the BMS, the BMS is communicatively connected to the MCU, the MCU is communicatively connected to the frequency converter through the main controller, and the frequency converter is electrically connected to the motor; the signal input terminal of the MCU is communicatively connected to the CTC and VCU.

[0014] This embodiment clarifies the internal composition and connection relationship of the electric unit, enabling the MCU to simultaneously receive signals from the VCU and CTC. This achieves coordinated processing of the original vehicle control signals and the optimized signals, ensuring the compatibility of the electric system with the original control logic, and providing an execution basis for speed optimization.

[0015] In one or more embodiments of the present invention, the outlet of the first hydraulic pump is connected to the oil tank through a first pressure relief valve and supplies oil to the lower body motor.

[0016] In one or more embodiments of the present invention, the outlet of the second hydraulic pump is connected to the oil tank through a second pressure relief valve, and supplies oil to the upper body motor and the cylinder.

[0017] In one or more embodiments of the present invention, the first pressure relief valve and the second pressure relief valve are both normally closed pressure relief valves, with their input terminals connected to the first signal converter and the second signal converter, respectively, and their output terminals connected back to the oil tank.

[0018] Under normal operating conditions, the pressure relief valve remains closed and the hydraulic pump supplies oil normally. When the CTC determines that it has entered a condition of getting out of trouble or climbing a slope, it controls the corresponding pressure relief valve to open through the signal converter, so that the corresponding hydraulic pump is unloaded, thereby realizing the centralized output of motor power to the travel hydraulic pump.

[0019] This embodiment defines a hydraulic system design with independent oil supply from two pumps, each equipped with a pressure relief valve and a return valve. This design provides a physical basis for subsequent centralized power control, enabling independent control of the upper and lower vehicle actions. It also allows for centralized power control through unloading under special working conditions, significantly improving the system's flexibility and adaptability.

[0020] In one or more embodiments of the present invention, the CTC includes a signal recognition module and an instruction reconstruction module. The signal recognition module is used to parse the operation content in the CAN signal output by the VCU, and the instruction reconstruction module generates an adjusted motor speed instruction based on the operation content and sends it to the electric motor unit.

[0021] This embodiment enables the CTC to parse the operation content in the VCU signal and generate optimized instructions based on the characteristics of the electric system by setting a signal recognition module and an instruction reconstruction module in the CTC. This achieves a leap from "signal pass-through" to "intelligent editing", provides technical support for refined energy-saving control, and solves the technical problem of the original VCU control logic not matching the characteristics of the electric system.

[0022] In one or more embodiments of the present invention, the CTC is further provided with an output port that is communicatively connected to the control terminals of the first signal converter and the second signal converter, for controlling the opening or closing of the corresponding first pressure relief valve and / or second pressure relief valve through the first signal converter and / or the second signal converter in the escape or climbing mode.

[0023] In this embodiment, the CTC is equipped with an output port connected to the control terminal of the signal converter, which can actively output control signals in the escape or climbing mode. The signal converter converts the signals into action signals for the pressure relief valve, thereby controlling the opening of the pressure relief valve and unloading the hydraulic pump. This allows the motor power to be concentrated and output to the travel hydraulic pump, significantly improving the vehicle's passability under extreme conditions. This solves the contradiction that configuring a high-power motor to meet extreme conditions leads to reduced efficiency, increased cost, and increased weight under normal conditions.

[0024] Another aspect of the present invention provides a control method for an electric conversion system for aerial work platforms, comprising the following steps: CTC receives the raw control signals sent by VCU and parses the current operation content; According to the preset energy-saving strategy, the motor speed adjustment command is sent to the electric unit; When a traction or hill-climbing operation is detected, the CTC opens or closes the corresponding first and / or second pressure relief valves through a first signal converter and / or a second signal converter, so that the motor power is concentrated and output to the walking hydraulic pump.

[0025] In this embodiment, the steps of receiving VCU signals by CTC, parsing operation content, adjusting speed commands, and controlling the opening and closing of the pressure relief valve through signal converter realize a complete control process from signal identification to power distribution. This enables the system to operate energy-savingly under normal conditions and concentrate power output under extreme conditions, taking into account both the economy of daily operation and the passability of special working conditions.

[0026] In one or more embodiments of the present invention, the preset energy-saving strategy includes adjustment strategies under different operating conditions: During the lifting operation, the CTC maintains the high-speed command output by the VCU and sends it to the MCU and the main controller respectively. During the descent operation, the CTC will send a speed command to the MCU to reduce the speed to a preset value, and the CTC will send a speed command to the main controller to reduce the speed to a preset value, in order to reduce energy consumption; During rotation operation, the CTC adjusts the motor speed command to a preset speed lower than the VCU output value according to the operation content; When the CTC detects that the control unit is in the walking and maximum throttle state and the vehicle speed is lower than the set threshold, it determines that it is in a difficult situation. The CTC controls the pressure relief valve corresponding to the non-walking hydraulic pump to open through the signal converter, so that the hydraulic pump is unloaded and the motor power is concentrated and output to the walking hydraulic pump.

[0027] This embodiment achieves precise control of motor speed by setting differentiated speed adjustment strategies for different working conditions such as lifting, lowering, rotating, and getting out of trouble. In light-load working conditions such as lowering and rotating, the speed is reduced to save energy. In the getting out of trouble working conditions, the power is concentrated by controlling the pressure relief valve through a signal converter. This verifies the applicability and effectiveness of the system in various actual working scenarios. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of an electric conversion system for aerial work platforms according to one embodiment of the present invention; Figure 2 This is a schematic diagram of the working process of an aerial work platform vehicle climbing a slope and getting out of trouble in one embodiment of the present invention; Figure 3 This is a schematic diagram of the working process of an aerial work platform vehicle under lifting / lowering conditions in one embodiment of the present invention; Figure 4 This is a schematic diagram of the workflow of the aerial work platform vehicle under other working conditions during operation, according to one embodiment of the present invention.

[0029] In the diagram: VCU100, electric unit 200, MCU210, main controller 220, frequency converter 230, motor 240, BMS250, battery 260, CTC300, control unit 400, first signal converter 510, second signal converter 520, first pressure relief valve 610, second pressure relief valve 620, proportional directional valve 710, proportional valve 720, lower body motor 810, upper body motor 820, hydraulic cylinder 830, first hydraulic pump 910, second hydraulic pump 920. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solutions of this invention, the technical solutions of the embodiments of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are merely some embodiments of this invention, and not all embodiments. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of this invention.

[0031] In the description of this invention, it should be understood that the terms "vertical", "horizontal", "top", "bottom", "upper", "lower", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0032] It should be noted that, unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0033] like Figure 1 As shown, the present invention provides an electrification retrofit system for aerial work platforms. This system upgrades traditional internal combustion engine-driven aerial work platforms using standardized modules, eliminating the need for extensive customization for different vehicle models.

[0034] In this embodiment, the aerial work platform vehicle electrification system includes a vehicle controller (VCU100), whose input terminal is communicatively connected to the control unit (400). The control unit (400) includes a driver operation interface such as a control handle and pedals. The VCU100 receives the raw operation signals generated by the control unit (400) and generates corresponding control commands. This connection method preserves the integrity of the original vehicle operating system, allowing drivers to operate without changing their habits, reducing operation training costs and the risk of operational errors.

[0035] The system also includes an electric unit 200, which communicates with the VCU100 to provide power to the entire vehicle. The electric unit 200 replaces the original internal combustion engine system, achieving zero-emission, low-noise green operation, while reducing fuel costs and maintenance frequency.

[0036] In a further embodiment, a CTC300 is also included. The input terminal of the CTC300 is connected to the CAN bus of the VCU100, and its output terminal is connected to the electric unit 200. The CTC300 is also connected to the first oil circuit through a first signal converter 510 and a first pressure relief valve 610, and to the second oil circuit through a second signal converter 520 and a second pressure relief valve 620. The first signal converter 510 and the second signal converter 520 are used to convert the control signal output by the CTC300 into the action signals of the first pressure relief valve 610 and the second pressure relief valve 620, respectively. The introduction of the CTC controller establishes a standardized electrification retrofit architecture, enabling the system to adapt to aerial work platforms of different models and years. The CTC controller is located between the VCU and the actuator, receiving signals from the original vehicle and performing intelligent signal processing, providing a hardware foundation for subsequent energy-saving control and centralized power control. This achieves a universal design for the electric system and solves the technical problems of high retrofit costs and difficulty in mass production caused by the large number of vehicle models in the prior art. In this embodiment, CTC300 is a signal repeater.

[0037] In a further embodiment, a first hydraulic pump 910 and a second hydraulic pump 920 are also provided in parallel. Both the first hydraulic pump 910 and the second hydraulic pump 920 are connected to the electric unit 200 and are driven by the electric unit 200. The first hydraulic pump 910 is connected to the lower body motor 810 through a first oil circuit, specifically providing hydraulic power for the lower body traveling mechanism; the second hydraulic pump 920 is connected to the upper body motor 820 and the hydraulic cylinder 830 through a second oil circuit, specifically providing hydraulic power for the lifting, rotating, and other operating mechanisms of the upper body. Figure 1 As shown, in this embodiment, the first oil circuit includes hydraulic oil circuits connecting the first hydraulic pump 910 and the proportional directional valve 710, and the proportional directional valve 710 and the lower body motor. The second oil circuit includes hydraulic oil circuits connecting the second hydraulic pump 920 and several sets of proportional valves 720, connecting the proportional valves 720 and the upper body motor 820, and connecting the proportional valves 720 and the cylinder 830. This hydraulic system design with dual pumps in parallel and clearly defined functions allows for independent control of the upper and lower body movements without interference, improving the system's control accuracy and response speed, while also providing a physical basis for subsequent centralized power control.

[0038] VCU100 is also connected to proportional directional valve 710 and multiple proportional valves 720. Proportional directional valve 710 controls the flow direction of hydraulic oil, enabling forward and reverse rotation control of the lower vehicle motor 810. Multiple proportional valves 720 control the extension and retraction speed of the upper vehicle cylinder 830 and the rotation speed of the motor 820, achieving precise operation. The control terminals of the first signal converter 510 and the second signal converter 520 are only connected to CTC300, controlling the opening and closing of the first pressure relief valve 610 and the second pressure relief valve 620 respectively, thereby controlling the unloading state of the corresponding hydraulic pump. VCU100 is directly connected to the proportional directional valve and proportional valves, preserving the original vehicle's control capabilities over the actuators and hydraulic system. This ensures that the basic operating functions of the original vehicle remain unaffected after electrification, eliminating the need for significant modifications to the hydraulic system, reducing the workload and risk of modification. The signal converters are only controlled by CTC, avoiding conflicts with the original vehicle VCU and simplifying the control logic.

[0039] Based on the above embodiments, see [link to relevant documentation]. Figure 1 The electric unit 200 includes an MCU 210, a main controller 220, a frequency converter 230, a motor 240, a BMS 250, and a battery 260.

[0040] Battery 260 is electrically connected to BMS250. BMS250 is responsible for monitoring the charging and discharging status, temperature, voltage, and other parameters of battery 260 to ensure safe battery operation and extend its service life. BMS250 is also communicatively connected to MCU210, providing real-time feedback on battery status information to MCU210. This allows MCU210 to dynamically adjust power output based on the remaining battery charge, preventing over-discharge and ensuring stable system operation.

[0041] The MCU210 communicates with the frequency converter 230 through the main controller 220. The main controller 220 acts as an intermediate layer, coordinating the control commands of the MCU210 and the execution actions of the frequency converter 230. The frequency converter 230 is electrically connected to the motor 240 and precisely controls the speed and torque of the motor 240 according to the received commands, thereby achieving precise adjustment of power output.

[0042] The signal input terminals of the MCU210 are communicatively connected to the CTC300 and VCU100. This dual-signal input structure enables the MCU210 to simultaneously receive the raw control signals from the VCU100 and the optimized control signals from the CTC300, achieving coordinated processing of the original vehicle control logic and the electric system optimization strategy. This ensures the compatibility of the electric system with the original control logic and provides an execution basis for speed optimization.

[0043] The electric unit adopts a modular design, with each component connected through a standard interface, which facilitates flexible configuration according to the power requirements of different vehicle models, further reducing the cost and difficulty of modification.

[0044] Based on the above embodiments, see [link to relevant documentation]. Figure 1 The outlet of the first hydraulic pump 910 is connected to the oil tank through the first pressure relief valve 610, and supplies oil to the lower body motor 810. The outlet of the second hydraulic pump 920 is connected to the oil tank through the second pressure relief valve 620, and supplies oil to the upper body motor 820 and the hydraulic cylinder 830.

[0045] Both the first pressure relief valve 610 and the second pressure relief valve 620 are normally closed pressure relief valves. Their oil inlets are connected to the first signal converter 510 and the second signal converter 520, respectively, and their outputs are connected back to the oil tank. Under normal operating conditions, the pressure relief valves remain closed, and the hydraulic pumps supply oil normally. When the CTC300 determines that it has entered a condition for getting out of trouble or climbing a slope, it controls the corresponding pressure relief valve to open through the signal converter, thereby unloading the corresponding hydraulic pump and realizing the centralized output of motor power to the travel hydraulic pump.

[0046] This hydraulic system design, with its dual pumps independently supplying oil and each equipped with a pressure relief valve for oil return, provides a physical basis for subsequent centralized power control. This allows for independent control of the vehicle's loading and unloading actions, and also enables centralized power control through unloading under special working conditions, significantly improving the system's flexibility and adaptability.

[0047] Based on the above embodiments, see [link to relevant documentation]. Figure 1 The signal input terminal of the first signal converter 510 is connected to the CTC300 for communication, the signal output terminal of the first signal converter 510 is connected to the first pressure relief valve 610 for communication, and the oil inlet of the first pressure relief valve 610 is connected to the oil outlet of the first hydraulic pump 910.

[0048] The signal input terminal of the second signal converter 520 is connected to the CTC300, the signal output terminal of the second signal converter 520 is connected to the second pressure relief valve 620, and the oil inlet of the second pressure relief valve 620 is connected to the oil outlet of the second hydraulic pump 920.

[0049] Through the aforementioned connection, the first signal converter 510 and the second signal converter 520 receive only the control signals from the CTC300, and respectively control the opening and closing states of the first pressure relief valve 610 and the second pressure relief valve 620. This structure makes the CTC300 the sole source of pressure relief valve control, avoiding control conflicts with the original vehicle VCU100. When the CTC300 detects special working conditions such as getting out of trouble or climbing, it can actively output a control signal, which is converted into an action signal for the pressure relief valve by the signal converter, thereby controlling the opening of the pressure relief valve, unloading the hydraulic pump, and thus concentrating the motor power output to the travel hydraulic pump. This provides a reliable execution means for power concentration in the get-out-of-trouble mode, significantly improving the vehicle's ability to pass under extreme working conditions.

[0050] Based on the above embodiments, the CTC300 includes a signal recognition module and an instruction reconstructing module.

[0051] The signal recognition module is used to parse the operation content in the CAN signal output by VCU100, including key information such as operation type (lifting, lowering, rotating, walking, etc.), operation range (throttle opening, handle angle, and operation direction). Based on the operation content parsed by the signal recognition module, the command reconstruction module, combined with preset energy-saving strategies and real-time operating conditions, generates an adjusted motor speed command and sends it to the electric unit 200.

[0052] By setting up a signal recognition module and an instruction reconfiguration module in the CTC300, the CTC controller can be upgraded from "signal pass-through" to "intelligent editing". It can understand the driver's operating intentions and optimize the original instructions according to the characteristics of the electric system, providing technical support for refined energy-saving control and solving the technical problem of the original VCU control logic not matching the characteristics of the electric system.

[0053] Based on the above embodiments, CTC300 is also provided with an output port that is communicatively connected to the control terminals of the first signal converter 510 and the second signal converter 520.

[0054] This output port is used to output control signals in escape or hill-climbing modes. Specifically, when the CTC300 detects that the vehicle is stuck in mud, has difficulty climbing hills, or needs instantaneous high power output, it sends a control signal through this output port to the first signal converter 510 and / or the second signal converter 520. The signal converters convert the control signal into a corresponding pressure relief valve drive signal, causing the first pressure relief valve 610 to open or close, and / or the second pressure relief valve 620 to open or close.

[0055] By controlling the opening of the pressure relief valve, the corresponding hydraulic pump enters an unloaded state, no longer consuming hydraulic power. This allows the entire power of the motor to be concentrated and output to the travel hydraulic pump, achieving instantaneous power concentration. This design enables the electric system to provide sufficient power output under extreme conditions, resolving the contradiction between configuring a high-power motor to meet extreme conditions and resulting in reduced efficiency, increased cost, and weight under normal operating conditions. This significantly improves the vehicle's passability and environmental adaptability.

[0056] The present invention also provides a control method for an electrification retrofit system for aerial work platforms. This method, applied to the system described in any of the above embodiments, includes the following steps: The CTC300 receives the raw control signals from the VCU100 and parses the current operation content. The CTC controller uses a signal recognition module to monitor and decode the signals on the CAN bus in real time, extracting the driver's operating intentions and parameters.

[0057] According to the preset energy-saving strategy, the motor speed command is adjusted and sent to the electric unit 200. Based on the parsed operation content and combined with the preset energy-saving strategies for different operating conditions, the CTC300 optimizes and adjusts the original speed command, generates a new speed command, and sends it to the MCU210 and main controller 220 of the electric unit 200, which then executes the optimized power output.

[0058] When an escape or hill-climbing operation is detected, the CTC300 opens or closes the corresponding first pressure relief valve 610 and / or second pressure relief valve 620 via the first signal converter 510 and / or the second signal converter 520, so that the motor power is concentrated and output to the travel hydraulic pump. The CTC300 determines whether an escape or hill-climbing condition has been entered by monitoring the status of the control unit 400 and the actual speed of the vehicle in real time. Once a special condition is determined, the CTC300 immediately controls the pressure relief valve to operate through the signal converter, thereby achieving concentrated power output.

[0059] Through the complete control process of the above three steps, closed-loop control from signal recognition to power distribution is realized, enabling the system to operate energy-savingly under normal conditions and concentrate power output under extreme conditions, thus taking into account both the economy of daily operation and the passability of special working conditions.

[0060] Based on the above control methods, the preset energy-saving strategy includes specific adjustment strategies for different operating conditions: like Figure 3 As shown, during the lifting operation, the CTC300 maintains the high-speed command output by the VCU100 and sends it to the MCU210 and the main controller 220 respectively. Lifting operations require a large power output, and maintaining the high-speed command ensures that the lifting action is fast and powerful, meeting the requirements of work efficiency.

[0061] like Figure 3 As shown, during the descent operation, the CTC300 reduces the speed command sent to the MCU210 to a preset value, and the CTC300 also reduces the speed command sent to the main controller 220 to a preset value to reduce energy consumption. The descent operation is a light-load condition that does not require high power output; reducing the motor speed can significantly reduce energy waste and extend the operating time.

[0062] like Figure 4 As shown, during rotational operation, the CTC300 adjusts the motor speed command to a preset speed lower than the VCU100 output value according to the operation. Rotational operation usually requires smooth and precise control; appropriately reducing the speed can improve control accuracy while reducing unnecessary energy consumption.

[0063] When the CTC300 detects that the control unit 400 is in the walking and maximum throttle state and the vehicle speed is below a set threshold, it determines that an escape condition has been reached. At this time, the CTC300 controls the opening of the pressure relief valve corresponding to the non-walking hydraulic pump through a signal converter, unloading the hydraulic pump and concentrating the motor power output to the walking hydraulic pump. For example, if the first hydraulic pump 910 is the walking pump and the second hydraulic pump 920 is the working pump, then the CTC300 controls the opening of the second pressure relief valve 620 through the second signal converter 520, unloading the second hydraulic pump 920 and concentrating the motor power output to the first hydraulic pump 910; and vice versa. By unloading the non-walking hydraulic pump, all power is concentrated on the walking hydraulic pump, providing maximum driving force to help the vehicle escape from a difficult situation.

[0064] The above embodiments are only for illustrating the technical concept and features of the present invention. Their purpose is to enable those skilled in the art to understand the content of the present invention and implement it. They should not be used to limit the scope of protection of the present invention. All equivalent changes or modifications made in accordance with the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A system for the electrification of aerial work platforms, characterized in that, include: VCU (100), whose input is communicatively connected to the control unit (400); An electric unit (200) is communicatively connected to the VCU (100) for providing power; The CTC (300) has its input terminal connected to the CAN bus of the VCU (100) and its output terminal connected to the electric unit (200).

2. The aerial work platform electric conversion system according to claim 1, characterized in that: The CTC (300) is connected to the first oil circuit via a first signal converter (510) and a first pressure relief valve (610). The CTC (300) is also connected to the second oil circuit via the second signal converter (520) and the second pressure relief valve (620); The first signal converter (510) and the second signal converter (520) are used to convert the control signal output by CTC into the action signals of the first pressure relief valve (610) and the second pressure relief valve (620), respectively.

3. The aerial work platform electric conversion system according to claim 2, characterized in that: It also includes a first hydraulic pump (910) and a second hydraulic pump (920) connected in parallel, both of which are connected to the electric unit (200); The first hydraulic pump (910) is connected to the lower body motor (810) through the first oil circuit, and the proportional directional valve (710) is set on the first oil circuit; The second hydraulic pump (920) is connected to the upper body motor (820) and the cylinder (830) respectively through the second oil circuit, and the proportional valve (720) is set on the second oil circuit; The VCU (100) is also connected to the proportional directional valve (710) and the proportional valve (720), respectively; The control terminals of the first signal converter (510) and the second signal converter (520) are connected to the CTC (300).

4. The aerial work platform electric conversion system according to claim 1, characterized in that: The electric unit (200) includes an MCU (210), a main controller (220), a frequency converter (230), a motor (240), a BMS (250), and a battery (260); wherein, The battery (260) is electrically connected to the BMS (250). The BMS (250) is communicatively connected to the MCU (210). The MCU (210) is communicatively connected to the frequency converter (230) through the main controller (220). The frequency converter (230) is electrically connected to the motor (240); The signal input terminal of the MCU (210) is communicatively connected to the CTC (300) and VCU (100).

5. The aerial work platform electric conversion system according to claim 3, characterized in that: The oil outlet of the first hydraulic pump (910) is connected to the oil tank through the first pressure relief valve (610) and supplies oil to the lower body motor (810).

6. The aerial work platform vehicle electrification retrofit system according to claim 3, characterized in that: The outlet of the second hydraulic pump (920) is connected to the oil tank through the second pressure relief valve (620) and supplies oil to the upper body motor (820) and the cylinder (830).

7. The aerial work platform vehicle electrification retrofit system according to claim 1, characterized in that: The CTC (300) includes a signal recognition module and an instruction reconstruction module. The signal recognition module is used to parse the operation content in the CAN signal output by the VCU (100). The instruction reconstruction module generates an adjusted motor speed instruction based on the operation content and sends it to the electric unit (200).

8. The aerial work platform vehicle electrification retrofit system according to claim 1, characterized in that: The CTC (300) is also provided with an output port that is communicatively connected to the control terminals of the first signal converter (510) and the second signal converter (520), for controlling the opening or closing of the corresponding first pressure relief valve (610) and / or second pressure relief valve (620) through the first signal converter (510) and / or the second signal converter (520) in the escape or climbing mode.

9. A control method applied to the electric conversion system of the aerial work platform vehicle according to any one of claims 1 to 8, characterized in that, Includes the following steps: The CTC (300) receives the raw control signals sent by the VCU (100) and parses the current operation content; According to the preset energy-saving strategy, the motor speed adjustment command is sent to the electric unit (200). When a traction or hill-climbing operation is detected, the CTC (300) opens or closes the corresponding first pressure relief valve (610) and / or second pressure relief valve (620) through the first signal converter (510) and / or the second signal converter (520), so that the motor power is concentrated and output to the walking hydraulic pump.

10. The control method for the electrification retrofit system of the aerial work platform according to claim 9, characterized in that, The preset energy-saving strategy includes adjustment strategies under different operating conditions: During the lifting operation, the CTC (300) maintains the high-speed command output by the VCU (100) and sends it to the MCU (210) and the main controller (220) respectively. During the descent operation, the CTC (300) reduces the speed command sent to the MCU (210) to a preset value, and the CTC (300) reduces the speed command sent to the main controller (220) to a preset value to reduce energy consumption; During rotation operation, the CTC (300) adjusts the motor speed command to a preset speed lower than the output value of the VCU (100) according to the operation content; When the CTC (300) detects that the control unit (400) is in the walking and maximum throttle state and the vehicle speed is lower than the set threshold, it determines that it is in a difficult situation. The CTC (300) controls the pressure relief valve corresponding to the non-walking hydraulic pump to open through the signal converter, so that the hydraulic pump is unloaded and the motor power is concentrated and output to the walking hydraulic pump.

Images