Vehicle extreme condition cooling liquid and hydraulic oil synergistic thermal control method and device

Abstract

The application discloses a kind of vehicle cooling liquid temperature and hydraulic oil temperature synergic heat control method and device under extreme conditions, can improve the working efficiency of special vehicle under extreme conditions, prolong the service life of special vehicle engine and hydraulic system.Method includes the following steps: step S1: key power on, ECU reads hydraulic oil temperature T 油 And cooling liquid temperature T 水 ;Step S2: after vehicle starts, whether the corresponding mode is activated according to different temperature and enters different auxiliary heating mode or auxiliary cooling mode.The application proposes a kind of special vehicle cooling liquid and hydraulic oil synergic heat management strategy and device under extreme conditions, through the strategy and device, the adverse effects caused by cooling liquid temperature and hydraulic oil temperature being too high or too low on special vehicle under extremely cold, extremely hot and other extreme conditions can be reduced, the working efficiency and construction safety factor of special vehicle under extreme environment are improved, and the service life of special vehicle engine and hydraulic system is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of auxiliary cooling and auxiliary heating control technology for coolant and hydraulic oil in special vehicles, specifically relating to a method and device for coordinated thermal control of coolant and hydraulic oil under extreme vehicle conditions. Background Technology

[0002] In special vehicles, engine coolant temperature and hydraulic oil temperature are crucial factors determining engine thermal efficiency, overall machine efficiency, and service life. Generally, coolant temperature should be controlled within the range of 85℃-95℃, and hydraulic oil temperature should be controlled within the range of 60℃-75℃. Under extreme conditions, hydraulic oil temperature can vary within the range of 30℃-80℃. Excessively high or low coolant and hydraulic oil temperatures will adversely affect the engine and hydraulic system.

[0003] When special vehicles start operating under extremely cold conditions, the low temperature of the hydraulic oil leads to a higher viscosity, poorer fluidity, and even clumping, which exacerbates the wear of the hydraulic structure, slows down the operation, and in severe cases may cause moving parts to fail to move, reducing the working efficiency of the hydraulic system.

[0004] When special vehicles operate under extremely hot conditions, they often experience problems such as low heat dissipation efficiency due to excessively low air pressure or high ambient temperature, leading to excessively high coolant and hydraulic oil temperatures. When the hydraulic oil temperature is too high, its viscosity decreases, its lubrication performance deteriorates, and the wear of hydraulic components accelerates, shortening their service life. Simultaneously, the seals of the hydraulic system and components deteriorate at high temperatures, reducing their elastic deformation capacity and thus decreasing sealing performance, or even causing seal failure.

[0005] Therefore, to minimize the occurrence of the above phenomena, under current technology, before initial operation of special vehicles in extremely cold conditions, the driver will operate the hydraulic mechanism under low load to warm up the hydraulic system. During operation in extremely hot conditions, if the coolant or hydraulic oil temperature becomes too high, the load must be reduced or even the machine shut down to cool the system. This affects driving and operational efficiency, construction safety, and construction progress. Summary of the Invention

[0006] This invention addresses the problem of adverse effects on special vehicles caused by excessively high or low coolant and hydraulic oil temperatures under extreme conditions. It proposes a method and device for coordinated thermal control of coolant and hydraulic oil temperatures under extreme conditions, which can improve the working efficiency of special vehicles under extreme conditions and extend the service life of the engine and hydraulic system of special vehicles.

[0007] To achieve the above objectives, the technical solution provided by the present invention is as follows:

[0008] First aspect

[0009] This invention provides a method for coordinated thermal control of coolant and hydraulic oil under extreme vehicle conditions, comprising the following steps:

[0010] Step S1: Power on the key, ECU reads hydraulic oil temperature T 油 and coolant temperature T 水 ;

[0011] Step S2: After the vehicle is started, determine whether to activate the corresponding mode and enter different auxiliary heating or auxiliary cooling modes based on different temperatures.

[0012] In step S2, the determination of whether to activate the corresponding mode and enter different auxiliary heating or auxiliary cooling modes based on different temperatures is as follows:

[0013] (1) Activation of auxiliary heating mode

[0014] When T is detected 水 ≥ Electronic thermostat opening temperature T1 and T 油 When the hydraulic oil reaches its minimum allowable temperature of T5, the auxiliary heating mode is activated: the ECU controls the electronic thermostat to fully open so that all engine coolant circulates in the large loop; controls the electromagnetic proportional valve to open so that the high-temperature coolant and low-temperature hydraulic oil exchange heat in the heat exchanger; controls the hydraulic oil suction pump to work so that the hydraulic oil forms a circulation loop between the hydraulic oil tank and the heat exchanger; and controls the engine electronic fan to enable the normal strategy to prevent the water temperature from getting too high.

[0015] (2) Exiting the auxiliary heating mode

[0016] When T is detected 水 When the electronic thermostat opens at temperature T1, the auxiliary heating mode is deactivated or disabled.

[0017] When T is detected 油 When the hydraulic oil temperature reaches or exceeds the minimum allowable temperature T5, the auxiliary heating mode should be deactivated or disabled.

[0018] When a remote throttle opening RmtAPP_r is detected, exit or disable the auxiliary heating mode.

[0019] (3) Activation of auxiliary cooling mode

[0020] When T is detected 水 > The maximum suitable temperature for the coolant is T4 and T 油When the hydraulic oil reaches its minimum suitable temperature of T6, activate auxiliary cooling mode 1: The ECU controls the electronic thermostat to fully open, allowing all engine coolant to circulate in the large loop; controls the electromagnetic proportional valve to open, allowing high-temperature coolant and low-temperature hydraulic oil to exchange heat in the heat exchanger; controls the hydraulic oil suction pump to operate, creating a circulation loop between the hydraulic oil tank and the heat exchanger; enables the engine electronic fan's normal strategy; enables the hydraulic system electronic fan's normal strategy.

[0021] When T is detected 水 <The maximum suitable temperature of the coolant is T4 and T 油 > When the hydraulic oil reaches its maximum permissible temperature T8, activate auxiliary cooling mode 2: The ECU first controls the electronic thermostat to fully open, ensuring all engine coolant circulates in the large loop, and then controls the engine's electronically controlled fan to run at full speed until T8 is reached. 水 ≤ Electronic thermostat opening temperature T1; waiting for T 水 When the electronic thermostat opens at temperature T1, the ECU controls the electromagnetic proportional valve to open, allowing the low-temperature coolant and high-temperature hydraulic oil to exchange heat in the heat exchanger. It also controls the hydraulic oil suction pump to work, creating a circulation loop between the hydraulic oil tank and the heat exchanger, and enables the conventional strategy of the hydraulic system's electric fan.

[0022] When T is detected 水 > The maximum suitable temperature for the coolant is T4 and T 油 When the hydraulic oil temperature is between the lowest suitable temperature T6 and the highest suitable temperature T7, auxiliary cooling mode 3 is activated: the ECU first controls the hydraulic system's electronically controlled fan to run at full speed until T7. 油 ≤The minimum suitable temperature of hydraulic oil is T6. Control the operation of the hydraulic oil suction pump to form a circulation loop between the hydraulic oil tank and the heat exchanger; wait for T... 油 When the hydraulic oil reaches its minimum suitable temperature of T6, the ECU controls the opening of the electromagnetic proportional valve to allow the high-temperature coolant and the low-temperature hydraulic oil to exchange heat in the heat exchanger, and controls the engine electronic fan to enable the normal logic.

[0023] (4) Exiting the auxiliary cooling mode

[0024] When T is detected 水 ≤Minimum suitable temperature of coolant T3 or T 油 > When the hydraulic oil reaches its maximum suitable temperature T7, disable or deactivate auxiliary cooling mode 1;

[0025] When T is detected 水 <Electronic thermostat opening temperature T1 or T 油 When the hydraulic oil temperature is ≤ T7 (the maximum suitable temperature for hydraulic oil), exit or disable auxiliary cooling mode 2.

[0026] When T is detected 水 ≤ Maximum suitable temperature of coolant T4 or T 油> When the maximum allowable temperature of the hydraulic oil is T8, exit or disable auxiliary cooling mode 3;

[0027] When T is detected 水 > The maximum suitable temperature for the coolant is T4 and T 油 >When the hydraulic oil reaches its maximum suitable temperature T7, exit or disable auxiliary cooling modes 1, 2, and 3.

[0028] Second aspect

[0029] This invention provides a vehicle coolant and hydraulic oil coordinated thermal control device under extreme conditions. The device performs the above-described method and includes: a hydraulic oil tank, a hydraulic pump, a hydraulic system electric fan, a hydraulic oil radiator, a hydraulic motor, an electric motor, a hydraulic oil suction pump, a check valve, a filter, an electronic thermostat, a water pump, an engine, an engine electric fan, a coolant radiator, an electromagnetic proportional valve, and a heat exchanger.

[0030] The hydraulic oil tank is provided with a hydraulic oil outlet A and a hydraulic oil inlet A to form a circulation loop. The hydraulic oil is driven by the hydraulic pump to enter the loop from the hydraulic oil outlet A, flows through the hydraulic oil radiator, and is cooled by the hydraulic system electric fan driven by the hydraulic motor. The hydraulic oil then enters the hydraulic oil tank through the hydraulic oil inlet A.

[0031] The hydraulic oil tank is equipped with a hydraulic oil outlet B and a hydraulic oil inlet B to form a circulation loop. The hydraulic oil is driven by a motor to a hydraulic oil suction pump to enter the loop from the hydraulic oil outlet B. After passing through a check valve and a filter, it enters the heat exchanger to exchange heat with the coolant, and finally enters the hydraulic oil tank from the hydraulic oil inlet B.

[0032] The engine has a coolant outlet and a coolant inlet forming a circulation loop. The coolant is driven by a water pump to enter the loop from the coolant outlet, flows through the electronic thermostat, and the ECU program determines whether the coolant should enter the small circulation loop or the large circulation loop. When the electronic thermostat is closed, the coolant enters the engine through the small circulation loop via the coolant inlet. When the electronic thermostat is open, the coolant enters the coolant radiator through the large circulation loop. The engine drives the engine's electronically controlled fan to cool the coolant. The coolant then flows through the solenoid proportional valve, and the ECU program determines whether the coolant should enter the heat exchanger. If the solenoid proportional valve is not open, the coolant directly enters the engine through the coolant inlet. If the solenoid proportional valve is open, the coolant enters the heat exchanger to exchange heat with the hydraulic oil, and finally enters the engine through the coolant inlet.

[0033] The temperature relationships of various engine coolants should meet the following conditions: electronic thermostat opening temperature < minimum suitable coolant temperature < maximum suitable coolant temperature; the temperature relationships of various hydraulic oils should be: minimum permissible hydraulic oil temperature < minimum suitable hydraulic oil temperature < maximum suitable hydraulic oil temperature < maximum permissible hydraulic oil temperature.

[0034] The device includes an ECU, a hydraulic oil temperature sensor, a coolant temperature sensor, and a remote accelerator pedal position sensor. The ECU processes the signals fed back by the sensors and sets the drive of the electromagnetic proportional valve, electronic thermostat, hydraulic system electric fan, engine electric fan, and hydraulic oil suction pump according to the control method.

[0035] Compared with the prior art, the beneficial effects of the present invention are:

[0036] This invention proposes a strategy and device for coordinated thermal management of coolant and hydraulic oil in special vehicles under extreme conditions. This strategy and device can reduce the adverse effects of excessively high or low coolant and hydraulic oil temperatures on special vehicles under extreme conditions such as extreme cold or heat, improve the working efficiency and construction safety factor of special vehicles in extreme environments, and extend the service life of the engine and hydraulic system of special vehicles. Attached Figure Description

[0037] Figure 1 The diagram shown is a schematic representation of the method provided in an embodiment of this application;

[0038] Figure 2 The diagram shown is a schematic diagram of the device structure provided in an embodiment of this application. Detailed Implementation

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] This invention discloses a method and device for coordinated thermal management of coolant and hydraulic oil in special vehicles, which is mainly applied to special vehicles under extreme conditions such as extreme cold and extreme heat, such as concrete pump trucks.

[0041] Before special vehicles begin operation in extremely cold conditions, the hydraulic oil temperature is too low, which reduces the efficiency of the hydraulic system. This solution utilizes the driving conditions of the special vehicle before operation to quickly warm up the engine coolant. Then, the ECU controls the operation of the electronic thermostat, the electric fan, and the hydraulic oil suction pump. A heat exchanger is used to assist in heating the low-temperature hydraulic oil with the high-temperature coolant.

[0042] Under extreme heat conditions in special vehicles, the coolant temperature becomes too high due to the reduced cooling efficiency of the engine's electronically controlled fan. This solution addresses this by controlling the hydraulic oil suction pump and the hydraulic system's electronically controlled fan, using a heat exchanger to assist in cooling the high-temperature coolant with low-temperature hydraulic oil.

[0043] Under extreme heat conditions in special vehicles, both the coolant and hydraulic oil temperatures are at high levels. If the coolant temperature becomes too high, this solution controls the hydraulic system's electrically controlled fan to run at full speed to lower the hydraulic oil temperature to the minimum suitable temperature. Then, the high-temperature coolant is further cooled by the low-temperature hydraulic oil through a heat exchanger.

[0044] If the hydraulic oil temperature is too high, this solution will reduce the coolant temperature to below the hydraulic oil temperature by controlling the engine's electronic fan to run at full speed and the electronic thermostat to open fully. Then, the high-temperature hydraulic oil will be cooled by the low-temperature coolant through a heat exchanger.

[0045] like Figure 1 The figure shown is an embodiment of the method provided by the present invention.

[0046] The method provided by this invention includes the following steps:

[0047] (1) Temperature parameter reading

[0048] When the key is turned on, the temperature reading phase begins, and the ECU reads the hydraulic oil temperature T. 油 and coolant temperature T 水 After the vehicle starts, it determines whether to activate the corresponding mode and enter different auxiliary heating or auxiliary cooling modes based on different temperatures.

[0049] (2) Activation of auxiliary heating mode

[0050] When T is detected 水 ≥ Electronic thermostat opening temperature T1 and T 油 When the hydraulic oil reaches its minimum allowable temperature of T5, the auxiliary heating mode is activated: the ECU controls the electronic thermostat to fully open, allowing all engine coolant to circulate in the large loop; it controls the opening of the electromagnetic proportional valve to allow the high-temperature coolant and low-temperature hydraulic oil to exchange heat in the heat exchanger; it controls the hydraulic oil suction pump to operate, forming a circulation loop between the hydraulic oil tank and the heat exchanger; and it controls the engine electronic fan to enable the normal strategy to prevent the water temperature from getting too high.

[0051] (3) Exiting the auxiliary heating mode

[0052] When T is detected 水 When the electronic thermostat opens at temperature T1, the auxiliary heating mode is deactivated or disabled. At this time, the engine temperature is too low. Considering the difficulty of cold starts and the deterioration of emissions, the auxiliary heating mode is not activated, and the engine is given priority.

[0053] When T is detected 油 When the hydraulic oil temperature reaches or exceeds the minimum allowable temperature T5, the auxiliary heating mode should be deactivated or disabled.

[0054] When a remote throttle opening RmtAPP_r is detected, the auxiliary heating mode is exited or disabled. At this point, it is assumed that the driver has begun loading operations. In order not to affect engine performance and reduce work efficiency, and considering that the hydraulic system heats up quickly after the construction machinery starts working, the auxiliary heating mode can be exited directly until the next driving cycle, at which point it will be determined whether to re-enter the auxiliary heating mode.

[0055] (4) Activation of auxiliary cooling mode

[0056] When T is detected 水 > The maximum suitable temperature for the coolant is T4 and T 油 When the hydraulic oil reaches its minimum suitable temperature (T6), the auxiliary cooling mode 1 is activated: the ECU controls the electronic thermostat to fully open, ensuring all engine coolant circulates in the main loop; it controls the solenoid proportional valve to open, allowing the high-temperature coolant and low-temperature hydraulic oil to exchange heat in the heat exchanger; it controls the hydraulic oil suction pump to operate, creating a circulation loop between the hydraulic oil tank and the heat exchanger; it enables the engine's electronically controlled fan's normal operating strategy; and it enables the hydraulic system's electronically controlled fan's normal operating strategy. Typically, at this time, the special vehicle is in driving condition, and the engine coolant temperature is high, while the upper structure's hydraulic system is not operating, resulting in a low hydraulic oil temperature. Therefore, the low-temperature hydraulic oil is used to assist in cooling the high-temperature coolant.

[0057] When T is detected 水 <The maximum suitable temperature of the coolant is T4 and T 油 > When the hydraulic oil reaches its maximum permissible temperature T8, activate auxiliary cooling mode 2: The ECU first controls the electronic thermostat to fully open, ensuring all engine coolant circulates in the large loop, and then controls the engine's electronically controlled fan to run at full speed until T8 is reached. 水 ≤ Electronic thermostat opening temperature T1; waiting for T 水 When the electronic thermostat opens to temperature T1, the ECU controls the solenoid proportional valve to open, allowing the low-temperature coolant and high-temperature hydraulic oil to exchange heat in the heat exchanger. It also controls the hydraulic oil suction pump to operate, creating a circulation loop between the hydraulic oil tank and the heat exchanger, and enables the hydraulic system's electronically controlled fan's normal operating strategy. It is generally believed that at this point, the upper structure's hydraulic system malfunctions, causing the hydraulic oil temperature to be too high. Auxiliary cooling mode 2 fully utilizes the engine's electronically controlled fan's cooling capacity to assist in cooling the upper structure's hydraulic oil.

[0058] When T is detected 水 > The maximum suitable temperature for the coolant is T4 and T 油 When the hydraulic oil temperature is between the lowest suitable temperature T6 and the highest suitable temperature T7, auxiliary cooling mode 3 is activated: the ECU first controls the hydraulic system's electronically controlled fan to run at full speed until T7. 油 ≤The minimum suitable temperature of hydraulic oil is T6. Control the operation of the hydraulic oil suction pump to form a circulation loop between the hydraulic oil tank and the heat exchanger; wait for T... 油When the hydraulic oil reaches its minimum suitable temperature (T6), the ECU controls the electromagnetic proportional valve to open, allowing the high-temperature coolant and low-temperature hydraulic oil to exchange heat in the heat exchanger, and enables the engine's electronically controlled fan according to normal logic. It is generally believed that at this point, the engine cooling system of the special vehicle is malfunctioning, causing the coolant temperature to be too high. Auxiliary cooling mode 3 fully utilizes the cooling capacity of the hydraulic system's electronically controlled fan to assist in cooling the engine coolant.

[0059] (4) Exiting the auxiliary cooling mode

[0060] When T is detected 水 ≤Minimum suitable temperature of coolant T3 or T 油 > When the hydraulic oil reaches its maximum suitable temperature T7, auxiliary cooling mode 1 is deactivated or disabled. At this point, it is assumed that the engine no longer has the conditions to continue auxiliary cooling of the high-temperature coolant by the low-temperature hydraulic oil, therefore auxiliary cooling mode 1 is deactivated or disabled.

[0061] When T is detected 水 <Electronic thermostat opening temperature T1 or T 油 When the hydraulic oil temperature is ≤ T7 (maximum suitable temperature), disengage or disable auxiliary cooling mode 2. This indicates that the engine is no longer suitable or capable of further reducing the coolant temperature; the hydraulic oil temperature has already dropped to the maximum suitable temperature.

[0062] When T is detected 水 ≤ Maximum suitable temperature of coolant T4 or T 油 > When the maximum permissible temperature of the hydraulic oil reaches T8, exit or disable auxiliary cooling mode 3. At this point, it is assumed that the engine no longer has the capability to continue auxiliary cooling of the high-temperature coolant by the low-temperature hydraulic oil.

[0063] When T is detected 水 > The maximum suitable temperature for the coolant is T4 and T 油 > When the hydraulic oil reaches its maximum suitable temperature T7, exit or disable auxiliary cooling modes 1, 2, and 3. At this time, it is assumed that both the engine coolant temperature and the hydraulic oil temperature have reached or exceeded the maximum suitable temperature, and both the engine electronic fan and the hydraulic system electronic fan have reached their maximum cooling capacity, thus no longer providing auxiliary cooling.

[0064] like Figure 2 The image shows an embodiment of the device provided by the present invention.

[0065] The device includes a hydraulic oil tank 1, a hydraulic pump 3, a hydraulic system electric fan 4, a hydraulic oil radiator 5, a hydraulic motor 6, an electric motor 9, a hydraulic oil suction pump 10, a check valve 11, a filter 12, an electronic thermostat 13, a water pump 14, an engine 17, an engine electric fan 18, a coolant radiator 19, an electromagnetic proportional valve 20, and a heat exchanger 21.

[0066] The hydraulic oil tank 1 is provided with a hydraulic oil outlet A2 and a hydraulic oil inlet A7 to form a circulation loop. The hydraulic oil is driven by the hydraulic pump 3 to enter the loop from the hydraulic oil outlet A2, flows through the hydraulic oil radiator 5, and is cooled by the hydraulic system electric fan 4 driven by the hydraulic motor 6. It then enters the hydraulic oil tank 1 through the hydraulic oil inlet A7.

[0067] The hydraulic oil tank 1 is provided with a hydraulic oil outlet B8 and a hydraulic oil inlet B22 to form a circulation loop. The hydraulic oil is driven by the motor 9 to the hydraulic oil suction pump 10 to enter the loop from the hydraulic oil outlet B8. After passing through the check valve 11 and the filter 12, it enters the heat exchanger 21 to exchange heat with the coolant, and finally enters the hydraulic oil tank 1 from the hydraulic oil inlet B22.

[0068] The engine has a coolant outlet 15 and a coolant inlet 16 forming a circulation loop. The coolant is driven by the water pump 14 to enter the loop from the coolant outlet 15, flows through the electronic thermostat 13, and the ECU program determines whether the coolant should flow through the small circulation loop 24 or the large circulation loop 23. When the electronic thermostat 13 is closed, the coolant flows through the small circulation loop 24 and enters the engine 17 through the coolant inlet 16. When the electronic thermostat 13 is open, the coolant flows through the large circulation loop 23 and enters the coolant radiator 19. The engine 17 drives the engine electric fan 18 to cool the coolant, and then the coolant flows through the solenoid proportional valve 20. The ECU program determines whether the coolant should enter the heat exchanger 21. If the solenoid proportional valve 20 is not open, the coolant directly enters the engine 17 through the coolant inlet 16. If the solenoid proportional valve 20 is open, the coolant enters the heat exchanger 21 to exchange heat with the hydraulic oil, and finally enters the engine 17 through the coolant inlet 16.

[0069] The device of this invention also includes an ECU controller, a hydraulic oil temperature sensor, a coolant temperature sensor, and a remote accelerator pedal position sensor. The ECU controller processes the signals fed back from these sensors and sets the actions of the solenoid proportional valve, electronic thermostat, hydraulic system electric fan, engine electric fan, and hydraulic oil suction pump according to the control strategy. When the ECU controller determines to exit or disable the auxiliary cooling and auxiliary heating modes, this strategy does not interfere with the operation of the electronic thermostat, hydraulic system electric fan, and engine electric fan according to their conventional strategies. Similarly, when the ECU controller determines to enable the conventional strategies of the hydraulic system electric fan and engine electric fan, this strategy does not interfere with their operation according to their conventional strategies. This achieves both independent operation of the engine and hydraulic system under normal conditions and coordinated control of coolant and hydraulic oil temperatures under extreme conditions.

[0070] The relationships between the various engine coolant temperatures should satisfy the following: electronic thermostat opening temperature < minimum suitable coolant temperature < maximum suitable coolant temperature; the relationships between the various hydraulic oil temperatures should satisfy the following: minimum allowable hydraulic oil temperature < minimum suitable hydraulic oil temperature < maximum suitable hydraulic oil temperature < maximum allowable hydraulic oil temperature. For example, when applied to concrete pump trucks, the electronic thermostat opening temperature can be set to 75°C, the minimum suitable coolant temperature to 85°C, the maximum suitable coolant temperature to 100°C, the minimum allowable hydraulic oil temperature to 30°C, the minimum suitable hydraulic oil temperature to 60°C, the maximum suitable hydraulic oil temperature to 75°C, and the maximum allowable hydraulic oil temperature to 80°C.

[0071] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for coordinated thermal control of coolant and hydraulic oil under extreme vehicle conditions, characterized in that, Includes the following steps: Step S1: Power on the key, ECU reads hydraulic oil temperature T 油 and coolant temperature T 水 ; Step S2: After the vehicle starts, determine whether to activate the corresponding mode and enter different auxiliary heating or auxiliary cooling modes based on different temperatures; In step S2, the determination of whether to activate the corresponding mode and enter different auxiliary heating or auxiliary cooling modes based on different temperatures is as follows: Activation of auxiliary heating mode When T is detected 水 ≥ Electronic thermostat opening temperature T1 and T 油 When the hydraulic oil reaches its minimum allowable temperature of T5, the auxiliary heating mode is activated: the ECU controls the electronic thermostat to fully open so that all engine coolant circulates in the large loop; controls the electromagnetic proportional valve to open so that the high-temperature coolant and low-temperature hydraulic oil exchange heat in the heat exchanger; controls the hydraulic oil suction pump to work so that the hydraulic oil forms a circulation loop between the hydraulic oil tank and the heat exchanger; and controls the engine electronic fan to enable the normal strategy to prevent the water temperature from getting too high. Exit auxiliary heating mode When T is detected 水 When the electronic thermostat opens at temperature T1, the auxiliary heating mode is deactivated or disabled. When T is detected 油 When the hydraulic oil temperature reaches or exceeds the minimum allowable temperature T5, the auxiliary heating mode should be deactivated or disabled. When a remote throttle opening RmtAPP_r is detected, exit or disable the auxiliary heating mode. Activation of auxiliary cooling mode When T is detected 水 > The maximum suitable temperature for the coolant is T4 and T 油 When the hydraulic oil reaches its minimum suitable temperature of T6, activate auxiliary cooling mode 1: The ECU controls the electronic thermostat to fully open, allowing all engine coolant to circulate in the large loop; controls the electromagnetic proportional valve to open, allowing high-temperature coolant and low-temperature hydraulic oil to exchange heat in the heat exchanger; controls the hydraulic oil suction pump to operate, creating a circulation loop between the hydraulic oil tank and the heat exchanger; enables the engine electronic fan's normal strategy; enables the hydraulic system electronic fan's normal strategy. When T is detected 水 <The maximum suitable temperature of the coolant is T4 and T 油 > When the hydraulic oil reaches its maximum permissible temperature T8, activate auxiliary cooling mode 2: The ECU first controls the electronic thermostat to fully open, ensuring all engine coolant circulates in the large loop, and then controls the engine's electronically controlled fan to run at full speed until T8 is reached. 水 ≤ Electronic thermostat opening temperature T1; waiting for T 水 When the electronic thermostat opens at temperature T1, the ECU controls the electromagnetic proportional valve to open, allowing the low-temperature coolant and high-temperature hydraulic oil to exchange heat in the heat exchanger. It also controls the hydraulic oil suction pump to work, creating a circulation loop between the hydraulic oil tank and the heat exchanger, and enables the conventional strategy of the hydraulic system's electric fan. When T is detected 水 > The maximum suitable temperature for the coolant is T4 and T 油 When the hydraulic oil temperature is between the lowest suitable temperature T6 and the highest suitable temperature T7, auxiliary cooling mode 3 is activated: the ECU first controls the hydraulic system's electronically controlled fan to run at full speed until T7. 油 ≤The minimum suitable temperature of hydraulic oil is T6. Control the operation of the hydraulic oil suction pump to form a circulation loop between the hydraulic oil tank and the heat exchanger; wait for T... 油 When the hydraulic oil reaches its minimum suitable temperature of T6, the ECU controls the opening of the electromagnetic proportional valve to allow the high-temperature coolant and the low-temperature hydraulic oil to exchange heat in the heat exchanger, and controls the engine electronic fan to enable the normal logic. Exiting auxiliary cooling mode When T is detected 水 ≤Minimum suitable temperature of coolant T3 or T 油 > When the hydraulic oil reaches its maximum suitable temperature T7, disable or deactivate auxiliary cooling mode 1; When T is detected 水 <Electronic thermostat opening temperature T1 or T 油 When the hydraulic oil temperature is ≤ T7 (the maximum suitable temperature for hydraulic oil), exit or disable auxiliary cooling mode 2. When T is detected 水 ≤ Maximum suitable temperature of coolant T4 or T 油 > When the maximum allowable temperature of the hydraulic oil is T8, exit or disable auxiliary cooling mode 3; When T is detected 水 > The maximum suitable temperature for the coolant is T4 and T 油 >When the hydraulic oil reaches its maximum suitable temperature T7, exit or disable auxiliary cooling modes 1, 2, and 3.

2. A device for coordinated thermal control of coolant and hydraulic oil under extreme vehicle conditions, characterized in that, The device performs the method described in claim 1 above, and the device includes: a hydraulic oil tank (1), a hydraulic pump (3), a hydraulic system electric fan (4), a hydraulic oil radiator (5), a hydraulic motor (6), an electric motor (9), a hydraulic oil suction pump (10), a check valve (11), a filter (12), an electronic thermostat (13), a water pump (14), an engine (17), an engine electric fan (18), a coolant radiator (19), an electromagnetic proportional valve (20), and a heat exchanger (21). The hydraulic oil tank (1) is provided with a hydraulic oil outlet A (2) and a hydraulic oil inlet A (7) to form a circulation loop. The hydraulic oil is driven by the hydraulic pump (3) to enter the loop from the hydraulic oil outlet A (2), flows through the hydraulic oil radiator (5), and is cooled by the hydraulic system electric fan (4) driven by the hydraulic motor (6) and enters the hydraulic oil tank (1) through the hydraulic oil inlet A (7). The hydraulic oil tank (1) is provided with a hydraulic oil outlet B (8) and a hydraulic oil inlet B (22) to form a circulation loop. The hydraulic oil is driven by the motor (9) to the hydraulic oil suction pump (10) to enter the loop from the hydraulic oil outlet B (8). After passing through the check valve (11) and the filter (12), it enters the heat exchanger (21) to exchange heat with the coolant. Finally, it enters the hydraulic oil tank (1) through the hydraulic oil inlet B (22). The engine is equipped with a coolant outlet (15) and a coolant inlet (16) forming a circulation loop. The coolant is driven by the water pump (14) to enter the loop from the coolant outlet (15) and flows through the electronic thermostat (13). The ECU program determines whether the coolant should flow through the small circulation loop (24) or the large circulation loop (23). When the electronic thermostat (13) is closed, the coolant flows through the small circulation loop (24) and enters the engine (17) through the coolant inlet (16). When the electronic thermostat (13) is open, the coolant flows through the large circulation loop (23). The coolant enters the coolant radiator (19), and the engine (17) drives the engine electric fan (18) to cool the coolant. Then it flows through the electromagnetic proportional valve (20). The ECU program determines whether the coolant enters the heat exchanger (21). If the electromagnetic proportional valve (20) is not open, the coolant directly enters the engine (17) through the coolant inlet (16). If the electromagnetic proportional valve (20) is open, the coolant enters the heat exchanger (21) to exchange heat with the hydraulic oil, and finally enters the engine (17) through the coolant inlet (16). The temperature relationships of various engine coolants should meet the following requirements: the opening temperature of the electronic thermostat (13) should be less than the minimum suitable temperature of the coolant and less than the maximum suitable temperature of the coolant; the temperature relationships of various hydraulic oils should be as follows: the minimum allowable temperature of the hydraulic oil should be less than the minimum suitable temperature of the hydraulic oil and less than the maximum suitable temperature of the hydraulic oil and less than the maximum allowable temperature of the hydraulic oil.

3. The vehicle extreme condition coolant and hydraulic oil coordinated thermal control device according to claim 2, characterized in that, The device includes an ECU, a hydraulic oil temperature sensor, a coolant temperature sensor, and a remote accelerator pedal position sensor. The ECU processes the signals fed back by the sensors and sets the drive of the electromagnetic proportional valve, electronic thermostat, hydraulic system electric fan, engine electric fan, and hydraulic oil suction pump according to the control method.

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