Cooling device for high-pressure cleaning vehicle-mounted motor and control method thereof

Abstract

This invention discloses a cooling and heat dissipation device and control method for the motor mounted on a high-pressure cleaning truck. The device uses a controller to collect the motor temperature in real time and dynamically adjusts the PWM duty cycle of the electronic water pump and radiator based on a preset temperature threshold, achieving precise control of coolant flow and heat dissipation power. The system employs a closed-loop cooling circuit design, combined with a linear adjustment algorithm and a piecewise PID control strategy, effectively improving heat dissipation efficiency and reducing energy consumption. It also features over-temperature protection and fault diagnosis functions, making it suitable for motor heat dissipation scenarios in special equipment such as high-pressure cleaning trucks.

Description

Technical Field

[0001] This invention belongs to the field of cooling and heat dissipation technology for motors mounted on cleaning trucks. Specifically, this invention relates to a cooling and heat dissipation device for motors mounted on high-pressure cleaning trucks and its control method. Background Technology

[0002] In the technical field of high-pressure cleaning trucks, the superstructure motor, as the power source driving core components such as the high-pressure water pump, directly determines the cleaning efficiency and operational reliability of the entire vehicle due to the stability of its working state. Because the superstructure motor experiences significant load fluctuations during startup, continuous operation, and shutdown, its operating temperature exhibits substantial changes: during high-intensity operation, the motor heats up rapidly due to increased energy loss, requiring efficient heat dissipation to prevent malfunctions such as insulation aging and magnet demagnetization; during idling or shutdown, the motor temperature gradually decreases, significantly reducing the need for heat dissipation.

[0003] In existing technologies, the cooling of the superstructure motor typically relies on the cooling interface built into the vehicle chassis. Specifically, the chassis cooling system is connected to the cooling channels of the superstructure motor via pipes, utilizing the fixed cooling power provided by the chassis to continuously cool the motor. However, this cooling method has a fundamental flaw: the cooling power of the chassis cooling system is a preset fixed value and cannot be dynamically adjusted according to the real-time temperature of the superstructure motor. When the motor temperature is low, excessive cooling power output will cause unnecessary energy consumption in the power system (especially the power battery of new energy high-pressure cleaning vehicles), significantly increasing the overall vehicle energy consumption cost in the long run, which is inconsistent with the industry trend of energy conservation and environmental protection.

[0004] To address the aforementioned issues, a motor-controller integrated cooling system has been proposed in related technical fields. This system utilizes the existing high-pressure water pump and spray system of the high-pressure cleaning truck. Cooling pipes are drawn from the multi-valve block that distributes the water to each nozzle, allowing some of the high-pressure water to flow through the heat dissipation channels of the pump motor and motor controller, completing heat exchange before being guided back to the main water tank. This solution attempts to reduce energy waste by reusing the existing hydraulic system, but it still has significant limitations in practice: Firstly, the distribution ratio of the cooling water flow is fixed by the mechanical structure of the multi-valve block and cannot be dynamically adjusted according to the real-time temperature of the motor. When the motor is under low load and low temperature, some high-pressure water still participates in cooling, leading to energy loss in the hydraulic system. Secondly, this system only targets the pump motor and controller, not other upper-mounted motor components on the high-pressure cleaning truck that require heat dissipation. These components still rely on the fixed power cooling of the chassis, and the overall energy waste problem is not fundamentally solved.

[0005] This invention provides a cooling and heat dissipation device for the motor mounted on a high-pressure cleaning vehicle, specifically addressing how to dynamically adjust the heat dissipation power based on the real-time temperature of the motor mounted on the high-pressure cleaning vehicle, thereby achieving precise and stable temperature control of the motor mounted on the vehicle, effectively reducing battery energy consumption, and minimizing the waste of power battery energy. Summary of the Invention

[0006] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, this invention provides a cooling and heat dissipation device for the motor mounted on a high-pressure cleaning vehicle. The purpose is to dynamically adjust the heat dissipation power according to the real-time temperature of the motor mounted on the high-pressure cleaning vehicle, thereby achieving precise and stable temperature control of the motor and reducing the waste of power battery energy.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a cooling and heat dissipation device for the motor mounted on a high-pressure cleaning vehicle, including an electronic water pump, a radiator, a mounted controller, and a mounted motor;

[0008] The power supply terminal of the electronic water pump is electrically connected to a low-voltage power supply, and its communication interface is connected to the first PWM output interface of the upper-mount controller.

[0009] The power supply terminal of the heat sink is electrically connected to the low-voltage power supply, and its communication interface is connected to the second PWM output interface of the upper-mounted controller.

[0010] The power supply terminal of the superstructure motor is electrically connected to a high-voltage power supply, and its communication interface is connected to the CAN communication interface of the superstructure controller via a CAN bus.

[0011] The superstructure controller is used to collect the real-time temperature value of the superstructure motor through the CAN bus, and control the duty cycle of the output signals of the first PWM interface and the second PWM interface according to the preset temperature threshold, so as to adjust the speed m of the electric water pump and the speed n of the radiator, thereby realizing the dynamic adjustment of the coolant circulation flow rate and heat dissipation power.

[0012] The power supply terminal of the superstructure controller is electrically connected to the low-voltage power supply, which provides operating voltage for the superstructure controller, the electronic water pump, and the radiator.

[0013] The cooling and heat dissipation device for the motor mounted on the high-pressure cleaning vehicle also includes a coolant circulation loop. The coolant circulation loop is connected in series with the electronic water pump, the radiator and the heat dissipation channel of the motor mounted on the vehicle. The electronic water pump is used to drive the coolant to flow in the circulation loop.

[0014] The superstructure controller executes the following control strategy:

[0015] When the upper motor is not working, the first PWM output interface has a 0% duty cycle and the second PWM output interface has a 0% duty cycle.

[0016] When the upper motor is working, the relationship between the real-time temperature value T of the upper motor and the preset temperature thresholds T_min and T_max is as follows:

[0017] If T≥T_max, output 100% duty cycle to the first PWM output interface and the second PWM output interface;

[0018] If T_min < T < T_max, output a% duty cycle to the first PWM output interface and b% duty cycle to the second PWM output interface, where a% = (n / n_max) × 100% + a_min%, and b% = (m / m_max) × 100% + b_min%.

[0019] If 0 < T ≤ T_min, output a_min% to the first PWM output interface and b_min% to the first PWM output interface;

[0020] If T≤0℃, output 0% duty cycle to the first PWM output interface and the second PWM output interface;

[0021] Where T_min is the lower limit of the safe operating temperature of the superstructure motor, and T_max is the maximum allowable temperature threshold of the superstructure motor.

[0022] Temperature percentage ΔT = [(T-T_min) / (T_max-T_min)] × 100%, used to linearly adjust radiator speed n = n_min + ΔT × (n_max-n_min) and electric water pump speed m = m_min + ΔT × (m_max-m_min).

[0023] The superstructure controller obtains the motor temperature value sent by the superstructure motor controller in real time via the CAN bus, and generates a PWM control signal based on a preset control algorithm.

[0024] Both the electronic water pump and the radiator are equipped with over-temperature protection modules, which automatically trigger frequency reduction or shutdown protection when the temperature exceeds the safety threshold.

[0025] The low-voltage power supply is a 12V / 24V vehicle battery system, and the high-voltage power supply is a 220V / 380V vehicle high-voltage battery pack.

[0026] The preset temperature thresholds T_min and T_max are dynamically calibrated based on the working characteristic curve of the upper motor and the heat dissipation requirements, forming a configurable parameter table stored in the upper controller.

[0027] The linear adjustment strategy employs a piecewise PID control algorithm, combined with feedforward compensation based on the rate of temperature change, to achieve more precise speed control.

[0028] The present invention also provides a control method based on the aforementioned cooling and heat dissipation device for the motor mounted on a high-pressure cleaning vehicle, comprising the following steps:

[0029] S1. Initialization phase: Establish CAN communication connection and load preset parameters;

[0030] S2. Real-time acquisition of the real-time temperature value T of the upper motor;

[0031] S3. Execute the corresponding PWM control strategy according to the interval to which the real-time temperature value T belongs;

[0032] S4. Calculate the target rotation speed based on the temperature percentage ΔT, and dynamically adjust the rotation speed of the electronic water pump and radiator.

[0033] The preset parameters include T_min, T_max, n_min, n_max, m_min, m_max, a_min%, b_min%, T_min is the lower limit of the safe operating temperature of the upper motor, T_max is the maximum allowable temperature threshold of the upper motor, n_min is the minimum speed of the radiator, n_max is the maximum speed of the radiator, m_min is the minimum speed of the electronic water pump, m_max is the maximum speed of the electronic water pump, a_min% is the minimum PWM duty cycle of the radiator, and b_min% is the minimum PWM duty cycle of the electronic water pump.

[0034] Radiator rotation speed n = n_min + ΔT × (n_max - n_min),

[0035] The rotational speed of the electronic water pump is m = m_min + ΔT × (m_max - m_min).

[0036] a%=a_min+(n / n_max)×100%, b%=b_min+(m / m_max)×100%.

[0037] In step S3, the PWM control strategy includes:

[0038] When T≥T_max, the superstructure controller outputs a PWM signal with a 100% duty cycle to the electric water pump, causing it to operate at the maximum speed m_max; at the same time, it outputs a PWM signal with a 100% duty cycle to the heat sink, causing it to operate at the maximum speed n_max.

[0039] In step S3, the PWM control strategy further includes:

[0040] When T_min < T < T_max, the upper-mount controller first calculates the temperature percentage ΔT, ΔT = [(T - T_min) ÷ (T_max - T_min)] × 100%; then, based on ΔT, it calculates the operating speed m of the electric water pump and the operating speed n of the radiator, m = m_min + ΔT × (m_max - m_min), n = n_min + ΔT × (n_max - n_min); finally, based on m and n, it outputs PWM signals a% and b% with corresponding duty cycles.

[0041] In step S3, the PWM control strategy further includes:

[0042] When 0 < T ≤ T_min, the upper-mount controller outputs a PWM signal with a duty cycle of b_min% to the electronic water pump, causing it to operate at m_min; and outputs a PWM signal with a duty cycle of a_min to the heat sink, causing it to operate at n_min.

[0043] When T≤0℃ or the upper motor is not working, the upper controller outputs a PWM signal with a 0% duty cycle to both the electronic water pump and the radiator, causing them to stop operating.

[0044] The present invention provides a cooling and heat dissipation device for a motor mounted on a high-pressure cleaning vehicle, which has the following beneficial effects:

[0045] The electric water pump and radiator cooling fan are controlled by PWM, and the electric water pump and radiator cooling fan are independently steplessly speed-regulated, which can precisely control the temperature of the superstructure motor. It can also avoid unnecessary consumption of vehicle battery energy, thereby reducing the waste of vehicle battery energy. At the same time, the temperature of the superstructure motor can be collected, and the speed of the electric water pump and radiator fan can be adjusted in real time through control methods, thereby achieving precise temperature control of the superstructure motor. Attached Figure Description

[0046] Figure 1 This is a schematic diagram of the electrical connection of the motor cooling and heat dissipation device for a high-pressure cleaning vehicle according to the present invention;

[0047] Figure 2 This is a schematic diagram of the coolant flow connection for the motor cooling and heat dissipation device installed on a high-pressure cleaning vehicle according to the present invention;

[0048] Figure 3 It is a flowchart of the control method. Detailed Implementation

[0049] To facilitate understanding of the present invention, a more comprehensive description of the present invention will be given below with reference to the accompanying drawings, which illustrate several embodiments of the present invention. However, the present invention can be implemented in different forms and is not limited to the embodiments described in the text. Rather, these embodiments are provided to make the disclosure of the present invention more thorough and complete.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly associated with those skilled in the art to which this invention pertains. The terminology used herein in the specification of this invention is for the purpose of describing particular embodiments and is not intended to limit the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0051] Firstly, such as Figure 1 and Figure 2 As shown, this embodiment of the invention provides a cooling and heat dissipation device for the motor mounted on a high-pressure cleaning vehicle, including an electronic water pump, a radiator, a mounting controller, and a mounting motor.

[0052] The power supply terminal of the electronic water pump is electrically connected to a low-voltage power supply, and its communication interface is connected to the first PWM output interface of the upper-mounted controller.

[0053] The power supply terminal of the heat sink is electrically connected to the low-voltage power supply, and its communication interface is connected to the second PWM output interface of the upper-mounted controller.

[0054] The power supply terminal of the superstructure motor is electrically connected to the high-voltage power supply, and its communication interface is connected to the CAN communication interface of the superstructure controller via the CAN bus.

[0055] The superstructure controller is used to collect the real-time temperature value of the superstructure motor through the CAN bus, and control the duty cycle of the output signals of the first PWM interface and the second PWM interface according to the preset temperature threshold, so as to adjust the speed m of the electric water pump and the speed n of the radiator (that is, the speed of the cooling fan), thereby realizing the dynamic adjustment of the coolant circulation flow and heat dissipation power.

[0056] Specifically, the high-pressure cleaning truck is equipped with an upper-mounted working device, whose motor is a high-voltage motor, providing the power to drive the upper-mounted working device in operation. Radiator

[0057] In this embodiment of the invention, the power supply terminal of the superstructure controller is electrically connected to a low-voltage power supply, which provides operating voltage for the superstructure controller, the electronic water pump, and the heat sink.

[0058] In this embodiment of the invention, the low-voltage power supply can be a 12V / 24V vehicle battery system, and the high-voltage power supply can be a 220V / 380V vehicle high-voltage battery pack.

[0059] In this embodiment of the invention, the positive terminal of the power supply of the electronic water pump is connected to the positive terminal of the low-voltage power supply, and the negative terminal of the power supply of the electronic water pump is connected to the negative terminal of the low-voltage power supply. The communication interface of the electronic water pump is connected to the first PWM output interface of the upper-mount controller. The positive terminal of the power supply of the heat sink is connected to the positive terminal of the low-voltage power supply, and the negative terminal of the power supply of the heat sink is connected to the negative terminal of the low-voltage power supply. The communication interface of the heat sink is connected to the second PWM output interface of the upper-mount controller. The positive terminal of the power supply of the upper-mount motor is connected to the positive terminal of the high-voltage power supply, and the negative terminal of the power supply of the upper-mount motor is connected to the negative terminal of the high-voltage power supply. The communication interface of the upper-mount motor is connected to the CAN communication interface of the upper-mount controller, and the temperature value of the upper-mount motor is collected through CAN communication. The positive terminal of the power supply of the upper-mount controller is connected to the positive terminal of the low-voltage power supply, and the negative terminal of the power supply of the upper-mount controller is connected to the negative terminal of the low-voltage power supply. The first PWM output interface and the second PWM output interface are respectively connected to the communication interfaces of the electronic water pump and the heat sink. The CAN communication interface is connected to the CAN communication interface of the upper-mount motor controller, and the temperature value of the upper-mount motor is collected through CAN communication, thereby controlling the speed of the electronic water pump and the heat sink, and accurately controlling the temperature of the upper-mount motor.

[0060] like Figure 2 As shown, the cooling and heat dissipation device for the motor of a high-pressure cleaning vehicle according to an embodiment of the present invention further includes a coolant circulation loop. The coolant circulation loop is connected in series with an electronic water pump, a radiator, and a heat dissipation channel for the motor. The electronic water pump drives the coolant to flow within the circulation loop. The motor controller acquires the input temperature value, the electronic water pump controls the flow rate of the circulating coolant, and the radiator controls the temperature dissipation of the coolant. Changes in the PWM signals input to the electronic water pump and the radiator result in changes in the output speed. The coolant outlet is connected to the inlet of the electronic water pump, the outlet of the electronic water pump is connected to the inlet of the radiator, the outlet of the radiator is connected to the inlet of the motor, and the outlet of the motor is connected to the inlet of the electronic water pump.

[0061] The radiator is equipped with a cooling fan. The core function of the radiator is to release the heat absorbed by the coolant when it flows through the motor to the outside environment. The cooling fan actively accelerates the airflow through forced convection. When the cooling fan is running, it actively draws in low-temperature outside air and makes it flow quickly through the radiator's heat dissipation fins and heat exchange pipes. The airflow generated by the cooling fan can break through this air layer, allowing the low-temperature air to directly contact the fin surface and quickly remove the heat. The high-temperature air that has absorbed the heat is forced out, which can improve the heat exchange efficiency of the radiator. It is especially suitable for high-pressure cleaning trucks in low-speed operation or stationary operation scenarios with insufficient airflow.

[0062] like Figure 2As shown, the coolant cooling device may include coolant, an electric water pump, a cooling fan, and a superstructure motor. The superstructure motor controller is used to acquire the input temperature value, the electric water pump is used to control the flow rate of the coolant circulation, and the cooling fan is used to control the temperature dissipation of the coolant. Changes in the PWM signals input to the electric water pump and cooling fan result in changes in their output speeds.

[0063] In this embodiment of the invention, the superstructure controller acquires the motor temperature value sent by the superstructure motor controller in real time via the CAN bus, and generates a PWM control signal based on a preset control algorithm. The preset temperature thresholds T_min and T_max can be dynamically calibrated according to the operating characteristic curve of the superstructure motor and the heat dissipation requirements, forming a configurable parameter table stored in the superstructure controller.

[0064] like Figure 3 As shown, after the superstructure power switch is turned on, the low-voltage power supply to the radiator, electric water pump, and superstructure controller is connected, and the high-voltage power supply to the superstructure motor is connected. The superstructure controller collects the real-time temperature value T of the superstructure motor via CAN communication.

[0065] In this embodiment of the invention, the superstructure controller executes the following control strategy:

[0066] When the upper motor is not working, the first PWM output interface has a 0% duty cycle and the second PWM output interface has a 0% duty cycle.

[0067] When the upper motor is working, the relationship between the real-time temperature value T of the upper motor and the preset temperature thresholds T_min and T_max is as follows:

[0068] If T≥T_max, output 100% duty cycle to the first PWM output interface and the second PWM output interface;

[0069] If T_min < T < T_max, output a% duty cycle to the first PWM output interface and b% duty cycle to the second PWM output interface, where a% = (n / n_max) × 100% + a_min%, and b% = (m / m_max) × 100% + b_min%.

[0070] If 0 < T ≤ T_min, output a_min% to the first PWM output interface and b_min% to the first PWM output interface;

[0071] If T≤0℃, output 0% duty cycle to the first PWM output interface and the second PWM output interface;

[0072] Wherein, T_min is the lower limit of the safe operating temperature of the superstructure motor, T_max is the maximum allowable temperature threshold of the superstructure motor, n_min is the minimum speed of the radiator, n_max is the maximum speed of the radiator, m_min is the minimum speed of the electronic water pump, m_max is the maximum speed of the electronic water pump, a% is the percentage of PWM signal output from the first PWM output interface, b% is the percentage of PWM signal output from the second PWM output interface, a_min% is the minimum PWM duty cycle of the first PWM output interface, and b_min% is the minimum PWM duty cycle of the second PWM output interface.

[0073] Temperature control is divided into four zones, with different control strategies employed for each zone. This ensures effective heat dissipation at high temperatures while avoiding energy waste at low temperatures. This tiered control strategy matches the actual heating characteristics of the motor, improving the system's adaptability and energy efficiency.

[0074] In this embodiment of the invention, the temperature percentage ΔT = [(T-T_min) / (T_max-T_min)] × 100% is used to linearly adjust the radiator speed n = n_min + ΔT × (n_max-n_min) and the electric water pump speed m = m_min + ΔT × (m_max-m_min).

[0075] Secondly, such as Figure 2 As shown, this embodiment of the invention also provides a control method based on a cooling and heat dissipation device for a motor mounted on a high-pressure cleaning vehicle, comprising the following steps:

[0076] S1. Initialization phase: Establish CAN communication connection and load preset parameters;

[0077] S2. Real-time acquisition of the real-time temperature value T of the upper motor;

[0078] S3. Execute the corresponding PWM control strategy according to the interval to which the real-time temperature value T belongs;

[0079] S4. Calculate the target rotation speed based on the temperature percentage ΔT, and dynamically adjust the rotation speed of the electronic water pump and radiator.

[0080] In step S1 above, after the power switch of the upper part is powered on, the low-voltage power supply of the upper part controller, electronic water pump, and radiator, as well as the high-voltage power supply of the upper part motor, are connected.

[0081] In step S2 above, during the operation of the superstructure motor, the superstructure controller collects the real-time temperature value T of the superstructure motor through the CAN bus.

[0082] In step S4 above, the superstructure controller outputs corresponding PWM signals to the electronic water pump and the radiator according to the range of the real-time temperature value T, thereby regulating their speed.

[0083] In this embodiment of the invention, the preset parameters include T_min, T_max, n_min, n_max, m_min, m_max, a_min%, and b_min%. T_min is the lower limit of the safe operating temperature of the upper motor, T_max is the maximum allowable temperature threshold of the upper motor, n_min is the minimum speed of the radiator, n_max is the maximum speed of the radiator, m_min is the minimum speed of the electronic water pump, m_max is the maximum speed of the electronic water pump, a% is the percentage of PWM signal output from the first PWM output interface, b% is the percentage of PWM signal output from the second PWM output interface, a_min% is the minimum PWM duty cycle of the first PWM output interface, and b_min% is the minimum PWM duty cycle of the second PWM output interface.

[0084] The radiator rotation speed n = n_min + ΔT × (n_max - n_min).

[0085] The rotational speed of the electronic water pump is m = m_min + ΔT × (m_max - m_min).

[0086] a%=a_min+(n / n_max)×100%, b%=b_min+(m / m_max)×100%.

[0087] In step S3 above, the PWM control strategy includes:

[0088] When T≥T_max, the superstructure controller outputs a PWM signal with a 100% duty cycle to the electric water pump, causing it to operate at the maximum speed m_max; at the same time, it outputs a PWM signal with a 100% duty cycle to the heat sink, causing it to operate at the maximum speed n_max.

[0089] In step S3 above, the PWM control strategy also includes:

[0090] When T_min < T < T_max, the upper-mount controller first calculates the temperature percentage ΔT, ΔT = [(T - T_min) ÷ (T_max - T_min)] × 100%; then, based on ΔT, it calculates the operating speed m of the electric water pump and the operating speed n of the radiator, m = m_min + ΔT × (m_max - m_min), n = n_min + ΔT × (n_max - n_min); finally, based on m and n, it outputs PWM signals a% and b% with corresponding duty cycles.

[0091] In step S3 above, the PWM control strategy also includes:

[0092] When 0 < T ≤ T_min, the upper-mount controller outputs a PWM signal with a duty cycle of b_min% to the electronic water pump, causing it to operate at m_min; and outputs a PWM signal with a duty cycle of a_min to the heat sink, causing it to operate at n_min.

[0093] When T≤0℃ or the upper motor is not working, the upper controller outputs a PWM signal with a 0% duty cycle to both the electronic water pump and the radiator, causing them to stop operating.

[0094] The cooling and heat dissipation device and control method for the motor mounted on a high-pressure cleaning vehicle provided in this embodiment of the invention have the following advantages:

[0095] 1. Achieving dynamic and precise control of heat dissipation power: In existing technologies, the chassis cooling system outputs a fixed power, and the heat dissipation power remains unchanged regardless of whether the superstructure motor is operating at high temperature or in a low-temperature standby state, resulting in ineffective consumption of battery energy. In this embodiment of the invention, closed-loop matching of heat dissipation power and motor temperature is achieved through the PWM control technology of the superstructure controller: the superstructure controller collects the motor temperature in real time via the CAN bus and outputs PWM signals with different duty cycles according to the temperature range (e.g., T≥T_max, T_min<T<T_max, etc.), directly controlling the flow rate of the electronic water pump and the heat dissipation efficiency of the radiator. For example, when the motor temperature is below T_min, it operates only at the minimum speed (m_min, n_min); when the temperature reaches T_max, it operates at the maximum speed for full-load heat dissipation, avoiding energy waste due to high heat dissipation under low load, and significantly reducing the power battery energy consumption of the high-pressure cleaning truck compared to existing technologies.

[0096] 2. By independently supplying a low-voltage power supply in conjunction with the superstructure controller, a cooling system independent of the chassis is constructed. The electronic water pump, radiator, and superstructure controller are all powered by the low-voltage power supply, eliminating the need to occupy chassis cooling resources. The superstructure controller, as the core control unit, only formulates control logic based on the temperature characteristics of the superstructure motor, and is not limited by the power of the chassis system. This independence is suitable for the battery management requirements of new energy high-pressure cleaning vehicles. The electronic water pump and radiator work together, with the electronic water pump controlling the coolant circulation flow rate and the radiator controlling the coolant heat dissipation efficiency. Both are uniformly controlled by the superstructure controller to achieve a match between flow rate and heat dissipation efficiency. When the motor temperature rises, the electronic water pump increases the coolant flow rate, while the radiator improves the heat dissipation efficiency. The two work together to quickly reduce the motor temperature. When the motor temperature decreases, they work together to reduce the workload and lower energy consumption.

[0097] 3. Existing technologies and related technologies lack a quantitative correlation between temperature and power. Cooling regulation is mostly open-loop control or two-stage regulation (such as only working / stopping states), which easily leads to excessive motor temperature fluctuations and affects service life. This invention achieves linear regulation of heat dissipation capacity by constructing a quantitative model of temperature percentage ΔT - speed - PWM duty cycle: When the motor temperature is between T_min and T_max, the temperature change is converted into a quantifiable speed adjustment parameter using the formula ΔT = [(T - T_min) ÷ (T_max - T_min)] × 100%. This allows the speed of the electronic water pump and radiator to change linearly with temperature, avoiding motor stress damage caused by sudden temperature rises and falls. Simultaneously, clearly defined intervals such as shutdown below 0℃ and minimum speed below T_min form a fine-grained regulation across the entire temperature range. Compared to the coarse-grained heat dissipation of existing technologies, this reduces motor temperature fluctuations and significantly improves motor operational stability.

[0098] 4. In this invention, the electronic water pump serves as the power source, driving the coolant to flow at high speed in the circuit (the flow rate increases with the rotational speed), quickly carrying away the heat generated by the motor. The radiator, through its cooling fins and fan, efficiently dissipates the heat from the coolant. The series connection of these three components ensures that the coolant experiences no energy loss during the heat absorption-heat dissipation-heat absorption cycle, thus improving heat exchange efficiency. Simultaneously, the flow rate of the electronic water pump and the heat dissipation capacity of the radiator are linked and controlled by the upper-mounted controller. When the flow rate increases, the radiator rotational speed increases synchronously, preventing excessive flow and insufficient heat dissipation that could lead to a rise in coolant temperature and ensuring the stability of the heat exchange system.

[0099] 5. This invention innovatively constructs a three-level control mode (economic / standard / high performance) and temperature response strategy, which can adapt to a variety of working scenarios and meet the heat dissipation requirements of different scenarios;

[0100] Economy mode: Prioritizes reducing energy consumption in the T_min < T < T_max range. By mapping the duty cycle of a% = a_min + (n / n_max) × 100%, a linear correlation between speed and PWM signal is achieved, reducing energy consumption while maintaining heat dissipation requirements; Economy mode is suitable for low-load scenarios.

[0101] High-performance mode: Triggers 100% duty cycle full-power cooling when T≥T_max, with a short response time and fast speed; high-performance mode is suitable for high-load scenarios;

[0102] Low temperature protection mechanism: When T≤0℃, the electronic water pump and radiator will automatically shut down to prevent damage to the pipes caused by the coolant freezing.

[0103] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, are all within the protection scope of the present invention.

Claims

1. A cooling and heat dissipation device for the motor mounted on a high-pressure cleaning vehicle, characterized in that, This includes an electric water pump, a radiator, a superstructure controller, and a superstructure motor; The power supply terminal of the electronic water pump is electrically connected to a low-voltage power supply, and its communication interface is connected to the first PWM output interface of the upper-mount controller. The power supply terminal of the heat sink is electrically connected to the low-voltage power supply, and its communication interface is connected to the second PWM output interface of the upper-mounted controller. The power supply terminal of the superstructure motor is electrically connected to a high-voltage power supply, and its communication interface is connected to the CAN communication interface of the superstructure controller via a CAN bus. The superstructure controller is used to collect the real-time temperature value of the superstructure motor through the CAN bus, and control the duty cycle of the output signals of the first PWM interface and the second PWM interface according to the preset temperature threshold, so as to adjust the speed m of the electric water pump and the speed n of the radiator, thereby realizing the dynamic adjustment of the coolant circulation flow rate and heat dissipation power.

2. The cooling and heat dissipation device for the motor mounted on a high-pressure cleaning vehicle according to claim 1, characterized in that, The power supply terminal of the superstructure controller is electrically connected to the low-voltage power supply, which provides operating voltage for the superstructure controller, the electronic water pump, and the radiator.

3. The cooling and heat dissipation device for the motor mounted on a high-pressure cleaning vehicle according to claim 1, characterized in that, It also includes a coolant circulation loop, in which the electronic water pump, radiator and the heat dissipation channel of the superstructure motor are connected in series, and the electronic water pump is used to drive the coolant to flow in the circulation loop.

4. The cooling and heat dissipation device for the motor mounted on a high-pressure cleaning vehicle according to any one of claims 1 to 3, characterized in that, The superstructure controller executes the following control strategy: When the upper motor is not working, the first PWM output interface has a 0% duty cycle and the second PWM output interface has a 0% duty cycle. When the upper motor is working, the relationship between the real-time temperature value T of the upper motor and the preset temperature thresholds T_min and T_max is as follows: If T≥T_max, output 100% duty cycle to the first PWM output interface and the second PWM output interface; If T_min < T < T_max, output a% duty cycle to the first PWM output interface and b% duty cycle to the second PWM output interface, where a% = (n / n_max) × 100% + a_min%, and b% = (m / m_max) × 100% + b_min%. If 0 < T ≤ T_min, output a_min% to the first PWM output interface and b_min% to the first PWM output interface; If T≤0℃, output 0% duty cycle to the first PWM output interface and the second PWM output interface; Where T_min is the lower limit of the safe operating temperature of the superstructure motor, and T_max is the maximum allowable temperature threshold of the superstructure motor.

5. The cooling and heat dissipation device for the motor mounted on a high-pressure cleaning vehicle according to claim 4, characterized in that, Temperature percentage ΔT = [(T-T_min) / (T_max-T_min)] × 100%, used to linearly adjust radiator speed n = n_min + ΔT × (n_max-n_min) and electric water pump speed m = m_min + ΔT × (m_max-m_min).

6. A control method for a motor cooling and heat dissipation device for a high-pressure cleaning vehicle based on any one of claims 1 to 5, characterized in that, Includes the following steps: S1. Initialization phase: Establish CAN communication connection and load preset parameters; S2. Real-time acquisition of the real-time temperature value T of the upper motor; S3. Execute the corresponding PWM control strategy according to the interval to which the real-time temperature value T belongs; S4. Calculate the target rotation speed based on the temperature percentage ΔT, and dynamically adjust the rotation speed of the electronic water pump and radiator.

7. The control method according to claim 6, characterized in that, The preset parameters include T_min, T_max, n_min, n_max, m_min, m_max, a_min%, b_min%, T_min is the lower limit of the safe operating temperature of the upper motor, T_max is the maximum allowable temperature threshold of the upper motor, n_min is the minimum speed of the radiator, n_max is the maximum speed of the radiator, m_min is the minimum speed of the electronic water pump, m_max is the maximum speed of the electronic water pump, a_min% is the minimum PWM duty cycle of the radiator, and b_min% is the minimum PWM duty cycle of the electronic water pump. Radiator rotation speed n = n_min + ΔT × (n_max - n_min), The rotational speed of the electronic water pump is m = m_min + ΔT × (m_max - m_min). a%=a_min+(n / n_max)×100%, b%=b_min+(m / m_max)×100%.

8. The control method according to claim 7, characterized in that, In step S3, the PWM control strategy includes: When T≥T_max, the superstructure controller outputs a PWM signal with a 100% duty cycle to the electric water pump, causing it to operate at the maximum speed m_max; at the same time, it outputs a PWM signal with a 100% duty cycle to the heat sink, causing it to operate at the maximum speed n_max.

9. The control method according to claim 8, characterized in that, In step S3, the PWM control strategy further includes: When T_min < T < T_max, the upper-mount controller first calculates the temperature percentage ΔT, ΔT = [(T - T_min) ÷ (T_max - T_min)] × 100%; then, based on ΔT, it calculates the operating speed m of the electric water pump and the operating speed n of the radiator, m = m_min + ΔT × (m_max - m_min), n = n_min + ΔT × (n_max - n_min); finally, based on m and n, it outputs PWM signals a% and b% with corresponding duty cycles.

10. The control method according to claim 8, characterized in that, In step S3, the PWM control strategy further includes: When 0 < T ≤ T_min, the upper-mount controller outputs a PWM signal with a duty cycle of b_min% to the electronic water pump, causing it to operate at m_min; and outputs a PWM signal with a duty cycle of a_min to the heat sink, causing it to operate at n_min. When T≤0℃ or the upper motor is not working, the upper controller outputs a PWM signal with a 0% duty cycle to both the electronic water pump and the radiator, causing them to stop operating.

Images