Thermal management system of hybrid cotton picker

Abstract

The invention provides a hybrid cotton picker thermal management system, which comprises an engine coolant loop, an electrical part coolant loop, a fuel heating loop and a control unit, and is characterized in that the engine coolant loop comprises an engine coolant pump, an engine coolant radiator and a first high-voltage electronic fan; the electrical part cooling liquid loop comprises a motor controller, a motor set, a fourth electronic four-way valve, a second radiator, a first electronic four-way valve and a third water pump. The fuel oil heating loop comprises a fuel oil heater and a temperature sensor, and the fuel oil heater is connected with the engine cooling liquid loop and the electric part cooling liquid loop; the control unit comprises a central processing unit, a temperature sensor and a pressure sensor, and the central processing unit achieves fine heat management of the engine cooling liquid loop and the electrical part cooling liquid loop according to detected temperature and pressure data and achieves fine heat management of all parts of the cotton picker.

Description

Technical Field

[0001] This invention relates to a thermal management system for a hybrid cotton harvester. Background Technology

[0002] With the continuous development of agricultural machinery technology, cotton harvesters have become an indispensable piece of equipment for cotton picking. They can not only solve the problem of labor shortage during the cotton harvest season, but also save labor costs and greatly improve cotton picking efficiency.

[0003] Currently, existing hybrid cotton harvester thermal management systems mainly use hydraulic motors to drive fans for forced air cooling of the radiator core, or use a large number of low-voltage electric fans for heat dissipation. These solutions suffer from high energy consumption, design difficulties, and poor heat dissipation efficiency. In addition, traditional cooling solutions have complex cooling pipe systems, resulting in long pipe layouts. Some pipes are prone to deformation during operation, leading to insufficient flow and affecting the normal operation of components.

[0004] Therefore, there is an urgent need for a thermal management system that can precisely control the heat dissipation requirements of each component, improve energy utilization efficiency, and extend equipment life. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a thermal management system for a hybrid cotton harvester. Through the coordination of various cooling and heating circuits and temperature and pressure sensors, it achieves refined thermal management of each component of the cotton harvester. This objective is achieved as follows:

[0006] This invention proposes a thermal management system for a hybrid cotton harvester, including an engine coolant circuit, an electrical component coolant circuit, a fuel heating circuit, and a control unit. The engine coolant circuit includes an engine coolant pump, an engine coolant radiator, and a first high-voltage electric fan. Both the engine coolant radiator and the first high-voltage electric fan are connected to the engine coolant pump for cooling the engine. The electrical component coolant circuit includes a motor controller, a motor assembly, a fourth electronic four-way valve, a second radiator, a first electronic four-way valve, and a third water pump. The motor assembly includes a first motor, a second motor, and a third motor. The first and second motors are connected in parallel and then in series with the third motor. The second radiator is equipped with a second high-voltage electric fan for active cooling. The motor controller... The device includes a first controller and a second controller connected in series, wherein the second controller controls the first and second motors, and the first controller controls the third motor; the fuel heating circuit includes a fuel heater and a temperature sensor, wherein the fuel heater is connected to the engine coolant circuit and the electrical component coolant circuit, and is used to provide auxiliary heating for the coolant in the two circuits; the control unit includes a central processing unit, a temperature sensor and a pressure sensor, wherein the temperature sensor is used to detect the engine coolant temperature and the electrical component coolant temperature, and the pressure sensor is used to detect the coolant pressure; the central processing unit, based on the detected temperature and pressure data, controls the opening and closing states of each electronic four-way valve and the water pump speed to achieve refined thermal management of the engine coolant circuit and the electrical component coolant circuit.

[0007] Furthermore, it also includes a power battery pack, which is connected in parallel with the motor to provide power to the motor when the engine stops working. The temperature of the power battery pack is monitored in real time by a temperature sensor. If the temperature is lower than a preset value, the central processing unit controls the second radiator and the second high-voltage electronic fan to start to preheat the power battery pack.

[0008] Furthermore, it also includes a maintenance mode switch, which controls the opening and closing status of each valve through the central processing unit, so that the system can shut down any loop in maintenance mode.

[0009] Compared with the prior art, the beneficial effects of the present invention are: the present invention achieves precise thermal management of each component of the cotton harvester by using a series and parallel design of cooling pipes in conjunction with a cooling water pump, temperature and pressure sensors. This effectively solves the problem of large differences in the power consumption and inconsistent heat generation of motors and electronic controls in different subsystems in the prior art, significantly reduces the temperature difference of each component, and extends the service life of the equipment.

[0010] This invention adopts a parallel connection of small flow rates and a series connection of large flow rates, which optimizes the layout of cooling pipes, reduces pipe length, avoids the problem of insufficient flow caused by deformation of some pipes during operation, ensures that the coolant can flow stably at the set flow rate, and guarantees the normal operation of the motor and electrical control.

[0011] Using the engine's high-voltage electronic fan as the main cooling air, or in conjunction with a high-voltage electronic cooling fan for synchronous cooling, significantly improves cooling efficiency, reduces energy consumption, reduces energy waste, and lowers the cotton harvester's fuel consumption.

[0012] The intelligent control system can adjust the flow and pressure of the coolant in real time according to the needs of different working conditions and modes of the cotton harvester, realizing precise control of the heat dissipation requirements of each component. This gives the system good adaptability, enables it to quickly respond to changes in different working modes, and ensures the stable operation of the cotton harvester. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the thermal management system of a hybrid cotton harvester. Detailed Implementation

[0014] To enhance understanding of the present invention, the present invention will be further described in detail below with reference to embodiments and accompanying drawings. These embodiments are only used to explain the present invention and do not constitute a limitation on the scope of protection of the present invention.

[0015] Example 1

[0016] Please refer to Figure 1 A thermal management system for a hybrid cotton harvester includes an engine coolant circuit, an electrical component coolant circuit, a fuel heating circuit, and a control unit.

[0017] The engine coolant circuit includes an engine coolant pump, an engine coolant radiator, and a first high-voltage electric fan. Both the engine coolant radiator and the first high-voltage electric fan are connected to the engine coolant pump for cooling the engine. The electrical component coolant circuit includes a motor controller, a motor assembly, a fourth electronic four-way valve, a second radiator, a first electronic four-way valve, and a third water pump. The motor assembly includes a first motor, a second motor, and a third motor. The first and second motors are connected in parallel, and then the third motor is connected in series. The second radiator is equipped with a second high-voltage electric fan for active cooling. The motor controller includes a first controller and a second controller connected in series. The second controller controls the first and second motors, and the first controller controls the third motor. The fuel heating circuit includes a fuel heater and a temperature sensor. The fuel heater is connected to both the engine coolant circuit and the electrical component coolant circuit for auxiliary heating of the coolant in both circuits. The control unit includes a central processing unit, a temperature sensor, and a pressure sensor. The temperature sensor is used to detect engine... The system includes coolant temperature and electrical component coolant temperature sensors, and pressure sensors to detect coolant pressure. The central processing unit (CPU) uses this data to control the opening and closing of various electronic four-way valves and the water pump speed, achieving refined thermal management of the engine coolant circuit and the electrical component coolant circuit. Thermocouples are installed at the connection points of the engine coolant circuit and the electrical component coolant circuit to detect the temperature difference between the two circuits. When the temperature difference exceeds a preset value, the CPU controls the fuel heater to activate and provide auxiliary heating to both circuits. The system also includes a power battery pack, connected in parallel with the motor to provide power to the motor when the engine is not running. Temperature sensors monitor the battery pack temperature in real time. If the temperature is lower than a preset value, the CPU controls the second radiator and the second high-voltage electric fan to activate and preheat the battery pack. The system also includes a maintenance mode switch. The CPU controls the opening and closing of various valves, allowing the system to retain only the necessary cooling circuits and close other unnecessary circuits in maintenance mode to reduce energy consumption.

[0018] Specifically, the engine coolant pump in the engine coolant circuit is a centrifugal pump with a rated power of 5kW and a maximum flow rate of 100L / min; the engine coolant radiator is a plate radiator with a heat exchange area of ​​50m²; the first high-pressure electric fan is an axial fan with a rated power of 2kW and a maximum airflow of 5000m³ / h; the motor controller for the electrical components coolant circuit is an IP68-rated controller; the first, second, and third motors are all permanent magnet synchronous motors with rated powers of 5kW, 5kW, and 3kW, respectively; the fourth electronic four-way valve, the first electronic four-way valve, and the second electronic four-way valve are all solenoid valves; the second radiator... The heat exchanger is a plate-type radiator with a heat exchange area of ​​30m²; the second high-pressure electric fan is an axial flow fan with a rated power of 3kW and a maximum airflow of 6000m³ / h; the fuel heater in the fuel heating circuit is a tube bundle heater with a rated power of 20kW and a maximum temperature rise / temperature difference of 60℃; the temperature sensor is a platinum resistance thermometer with a measurement range of -200~600℃; the temperature sensor in the control unit is a platinum resistance thermometer with a measurement range of -200~600℃; the pressure sensor is a capacitive pressure sensor with a measurement range of 0~2MPa; the power battery pack is a lithium-ion battery pack with a rated voltage of 400V and a rated capacity of 100Ah.

[0019] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A thermal management system for a hybrid cotton harvester, characterized in that, The system includes an engine coolant circuit, an electrical component coolant circuit, a fuel heating circuit, and a control unit. The engine coolant circuit includes an engine coolant pump, an engine coolant radiator, and a first high-voltage electric fan. The engine coolant radiator and the first high-voltage electric fan are both connected to the engine coolant pump for cooling the engine. The electrical component coolant circuit includes a motor controller, a motor assembly, a fourth electronic four-way valve, a second radiator, a first electronic four-way valve, and a third water pump. The motor assembly includes a first motor, a second motor, and a third motor. The first and second motors are connected in parallel and then connected in series with the third motor. The second radiator is equipped with a second high-voltage electric fan for active cooling. The motor controller includes a second high-voltage electric fan connected in series with the third motor. The system includes a first controller and a second controller, wherein the second controller controls the first and second motors, and the first controller controls the third motor. The fuel heating circuit includes a fuel heater and a temperature sensor. The fuel heater is connected to the engine coolant circuit and the electrical component coolant circuit to provide auxiliary heating for the coolant in both circuits. The control unit includes a central processing unit, a temperature sensor, and a pressure sensor. The temperature sensor detects the engine coolant temperature and the electrical component coolant temperature, and the pressure sensor detects the coolant pressure. Based on the detected temperature and pressure data, the central processing unit controls the opening and closing states of each electronic four-way valve and the water pump speed to achieve refined thermal management of the engine coolant circuit and the electrical component coolant circuit.

2. The hybrid cotton harvester thermal management system according to claim 1, characterized in that, It also includes a power battery pack, which is connected in parallel with the motor to provide power to the motor when the engine stops working. The temperature of the power battery pack is monitored in real time by a temperature sensor. If the temperature is lower than a preset value, the central processing unit controls the second radiator and the second high-voltage electronic fan to start to preheat the power battery pack.

3. The hybrid cotton harvester thermal management system according to claim 2, characterized in that, It also includes a maintenance mode switch, which controls the opening and closing status of each valve through the central processing unit, so that the system can shut down any loop in maintenance mode.

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