An extreme cold working condition thermal management system for a working machine and a control method thereof

Abstract

The application discloses an extreme cold working condition thermal management system for engineering machinery, which comprises a fuel heater, a fuel / battery / hydraulic oil heat exchanger, a three-way electromagnetic valve B, three single-channel electromagnetic valves A and an optional water collecting valve device. Each heat exchanger is arranged at a fuel tank, a battery periphery and a hydraulic oil tank respectively, a water circuit is formed by circulating an engine, each heat exchanger, an electromagnetic valve and the fuel heater, and the fuel tank supplies oil for the fuel heater; the system is provided with a main controller ECM and various sensors, which can collect fuel temperature TC, hydraulic oil temperature TA, battery voltage V0, ambient temperature T0 and engine cooling water temperature TB. The ECM controls the on-off of the electromagnetic valve and the channel switching of the three-way electromagnetic valve B, and can also control a built-in pump body of the fuel heater; and the control method is based on parameters such as the calibration optimal water temperature and the equipment allowed starting temperature, efficiently utilizes the fuel heater and the engine water temperature, realizes automatic and efficient heating of the engine, the hydraulic oil, the fuel and the battery, and adapts to the extreme cold working condition requirement.

Description

Technical Field

[0001] This invention relates to the field of thermal energy distribution and management in engineering machinery, and specifically to a thermal management system and control method for engineering machinery under extremely cold working conditions. Background Technology

[0002] In current extremely cold operating conditions, ranging from -20°C to -35°C, fuel heaters are commonly used. These heaters utilize fuel to heat the internal cooling water, preheating the engine block before startup and reducing starting resistance, thus aiding engine startup in extremely cold conditions. Additionally, they can heat the fuel tank and hydraulic oil tank before or after engine startup, assisting in warming the fuel and hydraulic oil and reducing efficiency losses caused by fluid viscosity. Furthermore, they also heat the battery, helping to address the difficulty of charging the battery in extremely cold conditions.

[0003] The aforementioned fuel heater system solution, while providing solutions for engine heating, hydraulic oil tank heating, fuel tank heating, and battery heating, generally operates on the logic that after fuel combustion, the heat directly heats each circuit until the fuel heater coolant temperature reaches 60°C, at which point it shuts off. Furthermore, it suffers from the following problems: 1. The pressure in each water circuit is different, and the flow rate is smaller due to greater resistance, resulting in uneven heating in each circuit; 2. The heating requirements of each water circuit are different. For example, the battery needs to be heated for a long time during operation in order to charge in extremely cold conditions; the fuel heating should be such that the fuel temperature is above the cold filter point; the hydraulic oil heating should ideally maintain the hydraulic oil at around 60°C, but the existing solution cannot control this specifically. 3. The on / off operation of the fuel heater generally relies on personal experience; without effective control, it can lead to fuel waste or insufficient heating. 4. The provided manual valve closing mechanism is inconvenient, the human-machine interface is unfriendly, and it cannot efficiently utilize heat energy for distribution.

[0004] Therefore, there is an urgent need for a heat energy distribution and management system that combines the engine and fuel heater. Summary of the Invention

[0005] To address the problems existing in the prior art, this invention provides a thermal management system and control method for engineering machinery operating in extremely cold conditions. The thermal management system includes: a fuel heater, a fuel / battery / hydraulic oil heat exchanger, a three-way solenoid valve B, three single-channel solenoid valves A, and an optional water collection valve. Each heat exchanger is located around the fuel tank, the battery, and the hydraulic oil tank, respectively. Water is circulated through the engine to each heat exchanger, solenoid valve, and fuel heater. The fuel tank supplies fuel to the fuel heater. The system is equipped with a main controller (ECM) and various sensors, capable of collecting data on fuel temperature (TC), hydraulic oil temperature (TA), battery voltage (V0), ambient temperature (T0), and engine coolant temperature (TB). The ECM controls the on / off state of the solenoid valves and the switching of the three-way solenoid valve B channel, and can also control the built-in pump of the fuel heater. By efficiently utilizing the fuel heater and combining it with the engine coolant temperature self-regulation, and by monitoring the machine's existing coolant temperature, hydraulic oil temperature, fuel temperature, and battery voltage, the system achieves automatic and efficient heating control of the engine, hydraulic oil, diesel fuel, and battery components, thus solving the aforementioned problems.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is: a thermal management system for extremely cold working conditions for engineering machinery, comprising: a fuel heater, a fuel heat exchanger, a battery heat exchanger, a hydraulic oil heat exchanger, a three-way solenoid valve B, and three single-channel solenoid valves A. The fuel heat exchanger is installed in the fuel tank of the construction machinery, the battery heat exchanger is wrapped around the battery in the construction machinery, and the hydraulic oil heat exchanger is installed in the hydraulic oil tank of the construction machinery. The outlet of the fuel heater is connected to the engine water inlet in the construction machinery, and the inlet of the fuel heater is connected to the outlet channel of the three-way solenoid valve B. The three-way solenoid valve B includes one inlet channel and two outlet channels. The inlet channel of the three-way solenoid valve B is connected to the outlet of three single-channel solenoid valves A respectively, and the two outlet channels are connected to the inlet of the fuel heater and the inlet of the engine in the construction machinery respectively. The inlets of the three single-channel solenoid valves A are respectively connected to the outlets of the fuel oil heat exchanger, the battery heat exchanger, and the hydraulic oil heat exchanger. The inlets of the fuel heat exchanger, battery heat exchanger, and hydraulic oil heat exchanger are connected to the engine outlet. The fuel tank is connected to the fuel heater via a fuel line, providing fuel to the fuel heater.

[0007] A thermal management system for engineering machinery in extremely cold conditions further includes: a water collection valve A and a water collection valve B. The water collection valve A and water collection valve B have multiple inlet and outlet channels and have no electromagnetic control function, and are used to realize the diversion and merging of water channels. The water collection valve A is located between the water inlet channel of the three-way solenoid valve B and the water outlet of the three single-channel solenoid valves A. The water collection valve B is located between the engine water outlet and the water inlet of the fuel heat exchanger, the battery heat exchanger, and the hydraulic oil heat exchanger.

[0008] Furthermore, the engineering machinery is equipped with an engine, a fuel tank, a hydraulic oil tank, a battery, an ambient temperature detection module, and a main controller (ECM). The fuel tank contains a fuel temperature sensor to collect the fuel temperature (TC) signal and transmit it to the ECM. The hydraulic oil tank contains a hydraulic oil temperature sensor to collect the hydraulic oil temperature (TA) signal and transmit it to the ECM. The battery has a voltage monitoring module to monitor the battery voltage (V0) and transmit it to the ECM. The ambient temperature detection module collects the ambient temperature (T0) feedback and transmits it to the ECM. The engine has a coolant temperature sensor to collect the coolant temperature signal and transmit it to the ECM.

[0009] Furthermore, the three single-channel solenoid valves A are respectively solenoid valve A1 for controlling the opening and closing of the hydraulic oil heating channel, solenoid valve A2 for controlling the opening and closing of the fuel heating channel, and solenoid valve A3 for controlling the opening and closing of the battery heating channel. Solenoid valves A1, A2, and A3 are all electrically connected to the main controller ECM and are controlled by the main controller ECM to realize the opening and closing of the channel.

[0010] Furthermore, the two water outlet channels in the three-way solenoid valve B are respectively a water outlet channel B1 leading to the fuel heater and a water outlet channel B2 leading to the engine; the three-way solenoid valve B is electrically connected to the main controller ECM, and the switching of the water outlet channels can be controlled by the main controller ECM.

[0011] Furthermore, the fuel heater has a built-in circulating water pump and fuel supply pump, which are electrically connected to the main controller ECM and can be controlled by the main controller ECM.

[0012] Before implementing the control method, the following data needs to be obtained: Based on the battery voltage and ambient temperature, determine the optimal coolant temperature TB0 when starting the engine under different ambient temperatures T0 and battery voltages V0; obtain the minimum allowable engine starting temperature T1 and the engine coolant temperature TB1 (not cold) from the engine supplier; the nominal battery voltage V1; the fuel cold filter point temperature TC1; and the hydraulic oil temperature TA1 (not cold) from the hydraulic oil supplier.

[0013] A control method for a thermal management system for engineering machinery operating in extremely cold conditions, wherein the control method performs thermal energy control and distribution in the main controller ECM, and the control method is as follows: Step 1: After the construction machinery is powered on, determine whether the ambient temperature is less than or equal to the minimum allowable starting temperature T1 of the engine. If it is less than or equal to, proceed to Step 2; otherwise, start the engine directly. Step 2: Start the fuel heater, open solenoid valve A3, and switch the three-way solenoid valve B to the water outlet channel B1 to heat the battery and engine; The ambient temperature T0 and battery voltage V0 are monitored in real time, and it is determined whether the monitored engine coolant temperature TB is greater than the optimal coolant temperature TB0 when the engine starts. If the monitored engine coolant temperature TB is less than or equal to the optimal coolant temperature TB0 when the engine starts, the battery and engine continue to be heated; if the monitored engine coolant temperature TB is greater than the optimal coolant temperature TB0 when the engine starts, step 3 is executed. Step 3: Start the engine and close solenoid valve A3, open solenoid valve A2 to heat the fuel tank and engine; determine whether the fuel temperature TC in the fuel tank is greater than the fuel cold filter point temperature TC1. If it is less, continue to heat the fuel tank and engine; if it is greater, close solenoid valve A2, open solenoid valve A1 to heat the hydraulic oil tank and engine, and proceed to step 4. Step 4: Determine whether the monitored engine coolant temperature TB is greater than the engine coolant temperature TB1 when it is not cold. If the monitored engine coolant temperature TB is less than or equal to the engine coolant temperature TB1 when it is not cold, continue heating the hydraulic oil tank and the engine. If the monitored engine coolant temperature TB is greater than the engine coolant temperature TB1 when it is not cold, turn off the fuel heater, switch the three-way solenoid valve B to the outlet channel B2, and proceed to step 5. Step 5: Determine if the monitored hydraulic oil temperature TA is greater than the non-cooled hydraulic oil temperature TA1. If the monitored hydraulic oil temperature TA is greater than the non-cooled hydraulic oil temperature TA1, close solenoid valve A1 and open solenoid valve A3. When the battery voltage V0 is greater than the battery nominal voltage V1, close solenoid valve A3, and the entire extreme cold condition thermal management system stops heating. When the battery voltage V0 is less than or equal to the battery nominal voltage V1, proceed to step 6. If the monitored hydraulic oil temperature TA is less than or equal to the non-cooled hydraulic oil temperature TA1, proceed to step 6. Step 6: Turn on the fuel heater, solenoid valve A1, and switch the three-way solenoid valve B to the water outlet channel B1. After turning on the fuel heater, solenoid valve A1, and switching the three-way solenoid valve B to the water outlet channel B1, proceed to step 4.

[0014] The beneficial effects of this invention are: 1) By calibrating different battery voltages, ambient temperatures, and optimal engine starter temperature, automatic start control can be implemented, and the battery can be preheated to improve its activity and facilitate engine starting. 2) Heat the fuel appropriately to above the fuel cold filter plugging point temperature to reduce poor combustion or even stalling caused by diesel viscosity; 3) Hydraulic oil with suitable viscosity can effectively improve the reliability and efficiency of the hydraulic system. However, heating hydraulic oil generally requires a lot of heat. Using engine hot water and fuel heaters for selective heating is highly efficient and energy-saving. 4) The battery is difficult to charge in cold conditions, so it is charged by heating while monitoring the nominal voltage; 5) By efficiently utilizing the fuel heater and combining it with the engine coolant temperature, the system monitors the existing coolant temperature, hydraulic oil temperature, fuel temperature, and battery voltage to achieve automatic and efficient heating control of the engine, hydraulic oil, diesel fuel, and battery components. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the control principle structure of the system of the present invention; Figure 2 This is a schematic diagram of the control method of the present invention. Detailed Implementation

[0016] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of the invention.

[0017] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of this invention is for the purpose of describing particular embodiments only and is not intended to limit the invention.

[0018] like Figure 1 As shown, a thermal management system for engineering machinery in extremely cold conditions includes: a fuel heater, a fuel heat exchanger, a battery heat exchanger, a hydraulic oil heat exchanger, a three-way solenoid valve B, and three single-channel solenoid valves A. Its waterway section: The fuel heat exchanger is installed in the fuel tank of the construction machinery and can fully contact the fuel to exchange heat. The battery heat exchanger is wrapped around the battery in the construction machinery and is used to exchange heat for the battery. The hydraulic oil heat exchanger is installed in the hydraulic oil tank of the construction machinery and can fully contact the hydraulic oil to exchange heat for the hydraulic oil. The outlet of the fuel heater is connected to the engine water inlet in the construction machinery, and the inlet of the fuel heater is connected to the outlet channel of the three-way solenoid valve B. The three-way solenoid valve B includes one inlet channel and two outlet channels. The inlet channel of the three-way solenoid valve B is connected to the outlet of three single-channel solenoid valves A respectively, and the two outlet channels are connected to the inlet of the fuel heater and the inlet of the engine in the construction machinery respectively. The inlets of the three single-channel solenoid valves A are respectively connected to the outlets of the fuel oil heat exchanger, the battery heat exchanger, and the hydraulic oil heat exchanger. The inlets of the fuel heat exchanger, battery heat exchanger, and hydraulic oil heat exchanger are connected to the engine outlet. Its oil circuit section: The fuel tank is connected to the fuel heater via a fuel line, providing fuel to the fuel heater.

[0019] The water circuit is filled with cooling water for heat exchange during the water circuit process.

[0020] A thermal management system for engineering machinery in extremely cold conditions further includes: a water collection valve A and a water collection valve B. The water collection valve A and water collection valve B have multiple inlet and outlet channels and have no electromagnetic control function, and are used to realize the diversion and merging of water channels. The water collection valve A is located between the water inlet channel of the three-way solenoid valve B and the water outlet of the three single-channel solenoid valves A. The water collection valve B is located between the engine water outlet and the water inlet of the fuel heat exchanger, the battery heat exchanger, and the hydraulic oil heat exchanger.

[0021] The construction machinery is equipped with an engine, fuel tank, hydraulic oil tank, battery, ambient temperature detection module, and main controller ECM. The fuel tank contains a fuel temperature sensor to collect the fuel temperature (TC) signal and transmit it to the main controller ECM. The hydraulic oil tank contains a hydraulic oil temperature sensor to collect the hydraulic oil temperature (TA) signal and transmit it to the main controller ECM. The battery has a voltage monitoring module to monitor the battery voltage (V0) and transmit it to the main controller ECM. The ambient temperature detection module collects the ambient temperature (T0) feedback and transmits it to the main controller ECM. The engine has a coolant temperature sensor to collect the coolant temperature signal and transmit it to the main controller ECM.

[0022] The three single-channel solenoid valves A are solenoid valve A1, which controls the opening and closing of the hydraulic oil heating channel; solenoid valve A2, which controls the opening and closing of the fuel heating channel; and solenoid valve A3, which controls the opening and closing of the battery heating channel. Solenoid valves A1, A2, and A3 are all electrically connected to the main controller ECM and are controlled by the main controller ECM to realize the opening and closing of the channel.

[0023] The three-way solenoid valve B has two water outlet channels, namely water outlet channel B1 leading to the fuel heater and water outlet channel B2 leading to the engine; the three-way solenoid valve B is electrically connected to the main controller ECM and can be controlled by the main controller ECM to switch the water outlet channels.

[0024] The fuel heater has a built-in circulating water pump and fuel supply pump, which are electrically connected to the main controller ECM and can be controlled by the main controller ECM. The circulating water pump circulates the coolant passing through the fuel heater, and the fuel supply pump draws fuel from the fuel tank to supply the fuel heater for heating.

[0025] Since construction machinery typically operates on diesel fuel, the fuel heater is a diesel fuel heater.

[0026] Before implementing the control method, the following data needs to be obtained: Based on the battery voltage and ambient temperature, determine the optimal coolant temperature TB0 when starting the engine under different ambient temperatures T0 and battery voltages V0; obtain the minimum allowable engine starting temperature T1 and the engine coolant temperature TB1 (not cold) from the engine supplier; the nominal battery voltage V1; the fuel cold filter point temperature TC1; and the hydraulic oil temperature TA1 (not cold) from the hydraulic oil supplier.

[0027] The fuel cold filter plugging point temperature TC1 can be set to the cold filter plugging point of -35 diesel fuel.

[0028] like Figure 2 As shown, a control method for a thermal management system for engineering machinery operating in extremely cold conditions is disclosed. The control method involves thermal energy control and distribution within the main controller (ECM). The control method is as follows: Step 1: After the construction machinery is powered on, determine whether the ambient temperature is less than or equal to the minimum allowable starting temperature T1 of the engine. If it is less than or equal to, proceed to Step 2; otherwise, start the engine directly. Step 2: Start the fuel heater, open solenoid valve A3, and switch the three-way solenoid valve B to the water outlet channel B1 to heat the battery and engine; The ambient temperature T0 and battery voltage V0 are monitored in real time, and it is determined whether the monitored engine coolant temperature TB is greater than the optimal coolant temperature TB0 when the engine starts. If the monitored engine coolant temperature TB is less than or equal to the optimal coolant temperature TB0 when the engine starts, the battery and engine continue to be heated; if the monitored engine coolant temperature TB is greater than the optimal coolant temperature TB0 when the engine starts, step 3 is executed. Step 3: Start the engine and close solenoid valve A3, open solenoid valve A2 to heat the fuel tank and engine; determine whether the fuel temperature TC in the fuel tank is greater than the fuel cold filter point temperature TC1. If it is less, continue to heat the fuel tank and engine; if it is greater, close solenoid valve A2, open solenoid valve A1 to heat the hydraulic oil tank and engine, and proceed to step 4. Step 4: Determine whether the monitored engine coolant temperature TB is greater than the engine coolant temperature TB1 when it is not cold. If the monitored engine coolant temperature TB is less than or equal to the engine coolant temperature TB1 when it is not cold, continue heating the hydraulic oil tank and the engine. If the monitored engine coolant temperature TB is greater than the engine coolant temperature TB1 when it is not cold, turn off the fuel heater, switch the three-way solenoid valve B to the outlet channel B2, and proceed to step 5. Step 5: Determine if the monitored hydraulic oil temperature TA is greater than the non-cooled hydraulic oil temperature TA1. If the monitored hydraulic oil temperature TA is greater than the non-cooled hydraulic oil temperature TA1, close solenoid valve A1 and open solenoid valve A3. When the battery voltage V0 is greater than the battery nominal voltage V1, close solenoid valve A3, and the entire extreme cold condition thermal management system stops heating. When the battery voltage V0 is less than or equal to the battery nominal voltage V1, proceed to step 6. If the monitored hydraulic oil temperature TA is less than or equal to the non-cooled hydraulic oil temperature TA1, proceed to step 6. Step 6: Turn on the fuel heater, solenoid valve A1, and switch the three-way solenoid valve B to the water outlet channel B1. After turning on the fuel heater, solenoid valve A1, and switching the three-way solenoid valve B to the water outlet channel B1, proceed to step 4.

[0029] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A control method for a thermal management system for engineering machinery operating in extremely cold conditions, characterized in that, The thermal management system for extreme cold conditions used in engineering machinery includes: a fuel heater, a fuel heat exchanger, a battery heat exchanger, a hydraulic oil heat exchanger, a three-way solenoid valve B, and three single-channel solenoid valves A. The fuel heat exchanger is installed in the fuel tank of the construction machinery, the battery heat exchanger is wrapped around the battery in the construction machinery, and the hydraulic oil heat exchanger is installed in the hydraulic oil tank of the construction machinery. The outlet of the fuel heater is connected to the engine water inlet in the construction machinery, and the inlet of the fuel heater is connected to the outlet channel of the three-way solenoid valve B. The three-way solenoid valve B includes one inlet channel and two outlet channels. The inlet channel of the three-way solenoid valve B is connected to the outlet of three single-channel solenoid valves A respectively, and the two outlet channels are connected to the inlet of the fuel heater and the inlet of the engine in the construction machinery respectively. The inlets of the three single-channel solenoid valves A are respectively connected to the outlets of the fuel oil heat exchanger, the battery heat exchanger, and the hydraulic oil heat exchanger. The inlets of the fuel heat exchanger, battery heat exchanger, and hydraulic oil heat exchanger are connected to the engine outlet. The fuel tank is connected to the fuel heater via a fuel line to supply fuel to the fuel heater; The three single-channel solenoid valves A are, respectively, solenoid valve A1 which controls the opening and closing of the hydraulic oil heating channel, solenoid valve A2 which controls the opening and closing of the fuel heating channel, and solenoid valve A3 which controls the opening and closing of the battery heating channel. The two water outlet channels in the three-way solenoid valve B are water outlet channel B1 leading to the fuel heater and water outlet channel B2 leading to the engine. The control method for the thermal management system of engineering machinery under extreme cold conditions involves thermal energy control and distribution in the main controller (ECM). The control method is as follows: Step 1: After the construction machinery is powered on, determine whether the ambient temperature is less than or equal to the minimum allowable starting temperature T1 of the engine. If it is less than or equal to, proceed to Step 2; otherwise, start the engine directly. Step 2: Start the fuel heater, open solenoid valve A3, and switch the three-way solenoid valve B to the water outlet channel B1 to heat the battery and engine; The ambient temperature T0 and battery voltage V0 are monitored in real time, and it is determined whether the monitored engine coolant temperature TB is greater than the optimal coolant temperature TB0 when the engine starts. If the monitored engine coolant temperature TB is less than or equal to the optimal coolant temperature TB0 when the engine starts, the battery and engine continue to be heated; if the monitored engine coolant temperature TB is greater than the optimal coolant temperature TB0 when the engine starts, step 3 is executed. Step 3: Start the engine and close solenoid valve A3, open solenoid valve A2 to heat the fuel tank and engine; determine whether the fuel temperature TC in the fuel tank is greater than the fuel cold filter point temperature TC1. If it is less, continue to heat the fuel tank and engine; if it is greater, close solenoid valve A2, open solenoid valve A1 to heat the hydraulic oil tank and engine, and proceed to step 4. Step 4: Determine whether the monitored engine coolant temperature TB is greater than the engine coolant temperature TB1 when it is not cold. If the monitored engine coolant temperature TB is less than or equal to the engine coolant temperature TB1 when it is not cold, continue heating the hydraulic oil tank and the engine. If the monitored engine coolant temperature TB is greater than the engine coolant temperature TB1 when it is not cold, turn off the fuel heater, switch the three-way solenoid valve B to the outlet channel B2, and proceed to step 5. Step 5: Determine if the monitored hydraulic oil temperature TA is greater than the non-cooled hydraulic oil temperature TA1. If the monitored hydraulic oil temperature TA is greater than the non-cooled hydraulic oil temperature TA1, close solenoid valve A1 and open solenoid valve A3. When the battery voltage V0 is greater than the battery nominal voltage V1, close solenoid valve A3, and the entire extreme cold condition thermal management system stops heating. When the battery voltage V0 is less than or equal to the battery nominal voltage V1, proceed to step 6. If the monitored hydraulic oil temperature TA is less than or equal to the non-cooled hydraulic oil temperature TA1, proceed to step 6. Step 6: Turn on the fuel heater, solenoid valve A1, and switch the three-way solenoid valve B to the water outlet channel B1. After turning on the fuel heater, solenoid valve A1, and switching the three-way solenoid valve B to the water outlet channel B1, proceed to step 4.

2. The control method for a thermal management system for engineering machinery under extremely cold conditions according to claim 1, characterized in that, Also includes: Water collector A and water collector B, which have multiple inlet and outlet channels and no electromagnetic control function, are used to realize the diversion and merging of water. Water collector A is located between the water inlet channel of the three-way solenoid valve B and the water outlet of the three single-channel solenoid valves A. Water collector B is located between the engine water outlet and the water inlet of the fuel heat exchanger, the battery heat exchanger, and the hydraulic oil heat exchanger.

3. The control method for an extreme cold-condition thermal management system for engineering machinery according to claim 1, characterized in that, The construction machinery is equipped with an engine, fuel tank, hydraulic oil tank, battery, ambient temperature detection module, and main controller ECM. The fuel tank contains a fuel temperature sensor to collect the fuel temperature (TC) signal and transmit it to the main controller ECM. The hydraulic oil tank contains a hydraulic oil temperature sensor to collect the hydraulic oil temperature (TA) signal and transmit it to the main controller ECM. The battery has a voltage monitoring module to monitor the battery voltage (V0) and transmit it to the main controller ECM. The ambient temperature detection module collects the ambient temperature (T0) feedback and transmits it to the main controller ECM. The engine has a coolant temperature sensor to collect the coolant temperature signal and transmit it to the main controller ECM.

4. The control method for a thermal management system for engineering machinery under extremely cold conditions according to claim 3, characterized in that, The solenoid valves A1, A2, and A3 are all electrically connected to the main controller ECM and are controlled by the main controller ECM to open and close the channels.

5. The control method for a thermal management system for engineering machinery under extremely cold conditions according to claim 4, characterized in that, The three-way solenoid valve B is electrically connected to the main controller ECM, and the main controller ECM can control the switching of the water outlet channel.

6. The control method for a thermal management system for engineering machinery under extremely cold conditions according to claim 4, characterized in that, The fuel heater has a built-in circulating water pump and fuel supply pump, which are electrically connected to the main controller ECM and can be controlled by the main controller ECM.

7. The control method for a thermal management system for engineering machinery under extremely cold conditions according to claim 6, characterized in that, Before implementing the control method, the following data needs to be obtained: Based on the battery voltage and ambient temperature, determine the optimal coolant temperature TB0 when starting the engine under different ambient temperatures T0 and battery voltages V0; obtain the minimum allowable engine starting temperature T1 and the engine coolant temperature TB1 (not cold) from the engine supplier; the nominal battery voltage V1; the fuel cold filter point temperature TC1; and the hydraulic oil temperature TA1 (not cold) from the hydraulic oil supplier.

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