A temperature control method, a thermal management device, a storage medium, a thermostat and a vehicle

Abstract

This invention discloses a temperature control method, thermal management device, storage medium, thermostat, and vehicle through embodiments. By connecting the vehicle's coolant tank, Exhaust Gas Recirculation (EGR) cooling pipeline, and power battery cooling pipeline, the cooling circulation pipeline is flexibly controlled in stages and time periods according to operating conditions, and temperature control accuracy is improved through closed-loop temperature regulation. Its technical effects include: firstly, its control valve group can flexibly control the flow rates of battery pack coolant and EGR coolant, achieving on-demand cooling of the battery pack and EGR exhaust gas; secondly, during engine warm-up, the EGR coolant flow rate can be reduced to achieve rapid heating of the EGR cooler, preventing particulate matter crystallization caused by EGR exhaust gas flowing through low-temperature pipelines; and thirdly, after the engine is fully warmed up and the EGR cooler is fully heated, the EGR coolant flow rate can be increased to appropriately lower the temperature of the cooled EGR exhaust gas, thereby increasing the density and flow rate of the introduced EGR exhaust gas and reducing fuel consumption.

Description

Technical Field

[0001] This invention belongs to the field of intelligent vehicle technology, and particularly relates to a temperature control method, a thermal management device, a storage medium, a thermostat, and a vehicle. Background Technology

[0002] To meet increasingly stringent emission and fuel consumption regulations, automakers are equipping hybrid vehicles with engines featuring Exhaust Gas Recirculation (EGR) technology to further reduce nitrogen oxide (NOx) emissions and fuel consumption.

[0003] EGR technology can be divided into high-pressure EGR and low-pressure EGR, such as Figure 1 The diagram shows the air-side structure of an EGR system in related technologies. Arrows indicate the direction of engine exhaust gas flow; arrow 711 represents high-temperature exhaust gas, and arrow 715 represents cooled, low-temperature exhaust gas. The high-temperature EGR exhaust gas exits from the engine exhaust pipe 712 and flows sequentially through the EGR cooler 719, the EGR temperature sensor 718, and the EGR valve 716 before entering the engine intake pipe or intake manifold 714. The low-pressure EGR is typically introduced into the intake pipe before the compressor in a turbocharged engine, while the high-pressure EGR is typically introduced into the intake manifold. The EGR exhaust gas and fresh air then merge and flow into the engine for combustion.

[0004] The gas side 710 of the EGR cooler 719 is used for the flow of high-temperature EGR exhaust gas to cool the EGR exhaust gas, and the water side 720 is used for the circulation of coolant to remove the heat of the high-temperature EGR exhaust gas; the EGR temperature sensor 718 is used to monitor the EGR exhaust gas temperature, and the EGR differential pressure sensor 717 is used to measure the pressure difference across the EGR valve and calculate the EGR exhaust gas flow rate.

[0005] When the EGR exhaust gas flows through the EGR cooler 709, the exhaust gas transfers heat to the coolant inside the cooler, and the coolant is connected to the engine's cooling water circuit through pipes.

[0006] like Figure 2 As shown, the EGR system cooling water circuit structure in the related technology is as follows: the inlet of the EGR cooler 709 is connected to the outlet 726 of the cooling water circuit of the engine body, and the outlet 724 of the EGR cooler is connected to the engine radiator 722; when the cooling water pump 721 is working, the coolant circulates in the water circuit, and is cooled by the radiator 722 and the fan 723. The temperature of the entire cooling water circuit is maintained within a reasonable range, and the temperature of the cooled EGR exhaust gas is maintained within a reasonable range.

[0007] The EGR system described above has the following technical problems: On the one hand, the EGR exhaust gas flow through the cooler and EGR valve body can easily cause particulate matter crystallization; on the other hand, the EGR cooler interferes with the temperature rise of the EGR temperature sensor, making it impossible to use the temperature rise of the EGR exhaust gas temperature sensor for EGR flow fault diagnosis. Summary of the Invention

[0008] The inventors discovered that the coolant circulation speed and fan speed are primarily determined by the cooling requirements of the engine's internal coolant temperature, and cannot simultaneously meet the cooling needs of the EGR system under different exhaust gas flow rates and temperatures; however, when... Figure 1 , Figure 2 When the EGR cooler 709 shown is at a low temperature, it needs to be heated up quickly to prevent particulate matter from crystallizing when the high-temperature EGR exhaust gas encounters the low-temperature cooler, which would affect the cooler's lifespan. In addition, in order to meet the cooling requirements of large-flow EGR exhaust gas, the EGR system needs to be equipped with a cooler with strong cooling capacity to ensure that the temperature of the cooled EGR exhaust gas is within a reasonable range. However, under low-flow EGR exhaust gas conditions, a cooler with strong cooling capacity will cause the exhaust gas temperature to drop rapidly when a small-flow EGR exhaust gas flows through it. The excessively low temperature of the EGR exhaust gas flowing through the cooler and EGR valve body can easily cause particulate matter crystallization.

[0009] On the other hand, the heat dissipation capacity of the EGR cooler, the temperature of the coolant in the EGR cooling water circuit, and the coolant flow rate directly affect the temperature of the cooled EGR exhaust gas, which in turn affects the temperature rise of the EGR temperature sensor. Excessive cooling capacity of the EGR cooler can greatly interfere with the temperature rise of the EGR temperature sensor, making it impossible to use the temperature rise of the EGR exhaust gas temperature sensor for EGR flow fault diagnosis when performing EGR flow diagnosis. Therefore, some engines may not have a suitable EGR high and low flow fault diagnosis solution.

[0010] The embodiments of the present invention provide an EGR system with a wide range of cooling intensity adjustment and active switching of pipeline structure, which is particularly suitable for implementation in hybrid vehicle engines.

[0011] Specifically, this invention discloses a temperature control method, including a first information detection step, a second pipeline switching step, and a third temperature adjustment step; wherein, the first information detection step acquires a first operating condition vector information and / or a first temperature vector information, wherein the first operating condition vector information includes a combination of physical quantities used to characterize the vehicle's operating state; the first temperature vector information includes at least one of a first temperature, a second temperature, and a third temperature.

[0012] Specifically, the first temperature is the temperature at the preset sampling position of the heat exchange medium of the first heat exchange component, the second temperature is the temperature at the preset sampling position of the heat exchange medium of the second heat exchange component, and the third temperature is the temperature at the preset sampling position of the heat exchange medium of the third heat exchange component.

[0013] Furthermore, the second pipeline switching step adjusts the on / off state and / or opening degree of the control valve group according to the first operating condition vector information; the control valve group includes a first inlet valve, a second inlet valve, a first outlet valve, and a second outlet valve.

[0014] Specifically, if the values ​​of each component of the first temperature vector information are all less than the first adjustment threshold C1, then all control valves in the control valve group are closed; if all control valves in the control valve group are closed, then the third temperature adjustment step prohibits the first power component from doing work, and the heat exchange medium in the vehicle temperature control circulation pipeline has no circulation process.

[0015] Furthermore, the first information detection step can continue to acquire the first demand level information of the first heat exchange component; the first demand level is provided by the battery management system or determined according to the real-time value or current value range of the first temperature vector information; each valve in its control valve group includes a switching valve and / or a regulating valve, the switching valve having two states of open and closed, and the regulating valve being a valve with a graded or continuously variable opening degree.

[0016] Specifically, if the value of the first demand level is less than the second adjustment threshold C2, the first inlet valve and the first outlet valve are closed, and the second inlet valve and the second outlet valve are opened; at the same time, the first power component is started to perform work, and the circulation process of the heat exchange medium is initiated.

[0017] Furthermore, if a regulating valve is present in the second inlet valve and / or the second outlet valve, the regulating valve is set to a preset second opening degree, which can be calibrated by the laboratory.

[0018] Furthermore, if the value of the first demand level is greater than the second adjustment threshold C2 and the value of the first demand level is less than the third adjustment threshold C3, or if the second temperature during vehicle engine operation is greater than the fourth adjustment threshold C4 and less than the fifth adjustment threshold C5, then the first water inlet valve is closed and the other control valves in the control valve group are opened.

[0019] Specifically, if the control valves in the control valve assembly that are not closed include regulating valves, the initial opening degree of the control valves can be set to the third opening degree C6, which can also be calibrated in the laboratory.

[0020] Furthermore, to improve the adjustment accuracy, a regulating valve can be used as the actuator to adjust the preset third target temperature and the first deviation ΔT1 of the third temperature using PI control or other closed-loop control. The P-part adjustment factor C7 of the PI control can be calibrated according to the first demand level and the first deviation ΔT1, and the I-part adjustment factor C8 can be calibrated according to the first deviation ΔT1. The third target temperature can be obtained by combining the base target temperature C9 and the ambient temperature correction coefficient C10. The base target temperature C9 is calibrated according to the first demand level and the third temperature, and the ambient temperature correction coefficient C10 is calibrated based on the ambient temperature.

[0021] Furthermore, if the value of the first demand level is greater than the third adjustment threshold C3 or the third temperature is greater than the fourth temperature threshold C11, and the vehicle engine is running and the second temperature is greater than the fifth temperature threshold C5, then the first inlet valve and the second outlet valve are closed, and the second inlet valve and the first outlet valve are opened; by adjusting the second inlet valve and / or the first outlet valve to the preset fourth target opening, and increasing the power output of the first power component to the fourth power value or the fourth power range, the temperature control achieves the expected effect.

[0022] Furthermore, if the value of the first demand level is greater than the third adjustment threshold C3 or the third temperature is greater than the fourth temperature threshold C11, and the vehicle engine is simultaneously running and the second temperature is less than the fifth temperature threshold C5, then the second water outlet valve is closed, and the remaining control valves of the control valve group are opened, so that the opening degree of one of the regulating valves is the fifth opening degree; the fifth opening degree is calibrated by the second temperature and the EGR exhaust gas flow rate; using the regulating valve corresponding to the fifth opening degree as the actuating component, PI control or other closed-loop control is used to adjust the preset second target temperature of the second temperature and the second deviation ΔT2 of the second temperature, and the P part adjustment factor C13 of the PI control can be calibrated according to the target value of the EGR exhaust gas temperature and the second deviation ΔT2, and the I part adjustment factor C14 can be calibrated according to the second deviation ΔT2; at the same time, the opening degree of the unclosed regulating valve in the control valve is adjusted according to the PI control.

[0023] Specifically, the aforementioned physical quantities may be at least one of ambient temperature, EGR exhaust gas flow rate, EGR diagnostic demand signal, vehicle speed, engine speed, and engine load; the vehicle may be a hybrid electric vehicle (HEV) or a plug-in hybrid electric vehicle (PHEV); the heat source of the first heat exchange component may be the power battery pack of the aforementioned vehicle; the first power component may be a water pump component or other device that can provide circulating power for the heat exchange medium; the target value of the exhaust gas temperature in the aforementioned closed-loop control may be selected to be between 45 and 60 degrees Celsius.

[0024] Furthermore, the temperature control method disclosed in this embodiment of the invention may also include a fourth diagnostic optimization step; wherein, if the first operating condition vector information contains valid EGR flow diagnostic request information, the second inlet valve and the second outlet valve are closed, and the first inlet valve and the first outlet valve are opened; then the opening degree of the control valve group is adjusted to the sixth preset opening degree; if the increase value of the second temperature within the preset time length is greater than the sixth temperature rise threshold, an EGR pipeline normal signal is output; conversely, if the increase value of the second temperature within the preset time length is less than the sixth temperature rise threshold, an EGR pipeline fault signal is output.

[0025] Furthermore, if the first operating condition vector information includes low temperature warning information or the ambient temperature is less than or equal to the preset seventh adjustment threshold, then the first demand level is replaced with the second demand level information, and the first inlet valve and the second outlet valve are closed, while the second inlet valve and the first outlet valve are opened, and the opening degree of the control valve group is adjusted to the seventh preset opening degree; the second demand level is provided by the battery management system as the power battery heating demand or the current temperature information of the power battery; at the same time, the heat exchange medium is heated through the third heat exchange component.

[0026] Furthermore, this embodiment of the invention also discloses a thermal management device, including a first information detection unit, a second pipeline switching unit, and a third temperature regulation unit; wherein, the first information detection unit acquires first operating condition vector information and / or first temperature vector information, the first operating condition vector information including a combination of physical quantities characterizing the vehicle's operating state; the first temperature vector information includes at least one of a first temperature, a second temperature, and a third temperature; wherein, the first temperature is the temperature at a preset sampling position of the heat exchange medium of the first heat exchange component, the second temperature is the temperature at a preset sampling position of the heat exchange medium of the second heat exchange component, and the third temperature is the temperature at a preset sampling position of the heat exchange medium of the third heat exchange component; the second pipeline switching unit adjusts the on / off state and / or opening degree of the control valve group according to the first operating condition vector information; the control valve group includes a first inlet valve, a second inlet valve, a first outlet valve, and a second outlet valve; if the value of each component of the first temperature vector information is less than a first adjustment threshold C1, then all control valves in the control valve group are closed; if all control valves in the control valve group are closed, then the third temperature regulation unit prohibits the first power component from doing work, and the heat exchange medium in the vehicle's temperature control circulation pipeline has no circulation process.

[0027] Furthermore, the first information detection unit acquires the first demand level of the first heat exchange component; this first demand level can be provided by the battery management system or determined based on the real-time value or current value range of the first temperature vector information; each valve in its control valve group includes a switching valve and / or a regulating valve; wherein, the switching valve has two states, open and closed, and the regulating valve is a valve with a graded or continuously variable opening degree; if the value of the first demand level is less than the second adjustment threshold C2, the first inlet valve and the first outlet valve are closed, and the second inlet valve and the second outlet valve are opened; at the same time, the first power component is activated to perform work and start the circulation process of its heat exchange medium; if there is a regulating valve in the second inlet valve and / or the second outlet valve, the regulating valve is set to a preset second opening degree, which can be calibrated by the laboratory.

[0028] Furthermore, if the value of the first demand level is greater than the second adjustment threshold C2 and the value of the first demand level is less than the third adjustment threshold C3, or if the second temperature during vehicle engine operation is greater than the fourth adjustment threshold C4 and less than the fifth adjustment threshold C5, then the first water inlet valve is closed and the other control valves in the control valve group are opened; if the control valves in the control valve group that are not closed include the regulating valve, then the initial opening degree of the control valve can be set to a preset third opening degree C6, which can be calibrated by the laboratory.

[0029] To improve control accuracy, the regulating valve can be used as the actuator, and PI control or other closed-loop control can be used to adjust the preset third target temperature and the first deviation ΔT1 of the third temperature. The P part of the PI control, the adjustment factor C7, is calibrated according to the first demand level and the first deviation ΔT1, and the I part, the adjustment factor C8, can be calibrated according to the first deviation ΔT1. The third target temperature can be obtained by combining the basic target temperature C9 and the ambient temperature correction coefficient C10. The basic target temperature C9 is calibrated according to the first demand level and the third temperature, and the ambient temperature correction coefficient C10 can be calibrated by the ambient temperature.

[0030] Furthermore, if the value of the first demand level is greater than the third adjustment threshold C3 or the third temperature is greater than the fourth temperature threshold C11, and the vehicle engine is running and the second temperature is greater than the fifth temperature threshold C5, then the first water inlet valve and the second water outlet valve are closed, and the second water inlet valve and the first water outlet valve are opened; the second water inlet valve and / or the first water outlet valve are adjusted to the preset fourth target opening, and the power output of the first power component is increased to the fourth power value or the fourth power range.

[0031] Furthermore, if the value of the first demand level is greater than the third adjustment threshold C3 or the third temperature is greater than the fourth temperature threshold C11, and the vehicle engine is simultaneously running and the second temperature is less than the fifth temperature threshold C5, then the second water outlet valve is closed, and the remaining control valves of the control valve group are opened, so that the opening degree of one of the regulating valves is the fifth opening degree; this fifth opening degree can be calibrated by the second temperature and the EGR exhaust gas flow rate; using the regulating valve corresponding to the fifth opening degree as the actuating component, PI control or other closed-loop control is used to adjust the preset second target temperature of the second temperature and the second deviation ΔT2 of the second temperature, the P part adjustment factor C13 of the PI control can be calibrated according to the target value of the EGR exhaust gas temperature and the second deviation ΔT2, and its I part adjustment factor C14 can be calibrated according to the second deviation ΔT2; and the opening degree of the unclosed regulating valve in the control valve is adjusted according to the PI control.

[0032] Similarly, the aforementioned physical quantities may be at least one of ambient temperature, EGR exhaust gas flow rate, EGR diagnostic demand signal, vehicle speed, engine speed, and engine load; the vehicle may be a hybrid electric vehicle (HEV) or a plug-in hybrid electric vehicle (PHEV); the heat source of the first heat exchange component may be the vehicle's power battery pack, battery array, or other devices to be cooled or insulated; the first power component may be a water pump component or other devices that provide circulating power for the heat exchange medium; wherein, the target value of the exhaust gas temperature in the closed-loop control is between 45 and 60 degrees Celsius.

[0033] Furthermore, its thermal management device can also include a fourth diagnostic optimization unit; wherein, if the first operating condition vector information contains valid EGR flow diagnostic request information, the second inlet valve and the second outlet valve are closed, and the first inlet valve and the first outlet valve are opened, and the opening degree of the control valve group is adjusted to the sixth preset opening degree; if the increase value of the second temperature within the preset time length is greater than the sixth temperature rise threshold, an EGR pipeline normal signal is output; conversely, if the increase value of the second temperature within the preset time length is less than the sixth temperature rise threshold, an EGR pipeline fault signal is output.

[0034] Furthermore, if the first operating condition vector information includes low temperature warning information or the ambient temperature is less than or equal to the preset seventh adjustment threshold, then the first demand level information is replaced with the second demand level information, and the first inlet valve and the second outlet valve are closed, while the second inlet valve and the first outlet valve are opened, and the opening degree of the control valve group is adjusted to the seventh preset opening degree; the second demand level is given by the battery management system as the power battery heating demand or the current temperature information of the power battery; at the same time, the heat exchange medium is heated through the third heat exchange component.

[0035] Furthermore, embodiments of the present invention also disclose a computer storage medium, including a storage medium body for storing a computer program; when the computer program is executed by a microprocessor, it can implement any of the above-mentioned temperature control methods.

[0036] Furthermore, embodiments of the present invention also disclose a thermostat, including any of the thermal management devices and / or any of the storage media described above.

[0037] Furthermore, embodiments of the present invention also disclose a vehicle including any of the above thermal management devices and / or any of the above storage media and / or any of the above thermostats; wherein the first demand level of its thermal management devices may be provided by a battery management system (BMS).

[0038] This invention discloses a temperature control method, thermal management device, storage medium, thermostat, and vehicle through embodiments. By connecting the vehicle's coolant tank, exhaust gas recirculation (EGR) cooling pipeline, and power battery cooling pipeline, the cooling circulation pipeline is flexibly controlled in stages and time periods according to operating conditions, and temperature control accuracy is improved through closed-loop temperature regulation. Its technical effects include: firstly, its control valve group can flexibly control the flow rates of battery pack coolant and EGR coolant, achieving on-demand cooling of the battery pack and EGR exhaust gas; secondly, during engine warm-up, the EGR coolant flow rate can be reduced to achieve rapid heating of the EGR cooler, preventing particulate matter crystallization caused by EGR exhaust gas flowing through low-temperature pipelines; and thirdly, after the engine is fully warmed up and the EGR cooler is fully heated, the EGR coolant flow rate can be increased to appropriately lower the temperature of the cooled EGR exhaust gas, thereby increasing the density and flow rate of the introduced EGR exhaust gas and reducing fuel consumption.

[0039] On the other hand, through closed-loop control, such as PI regulation, the alternation of large and small circulation cooling water circuits can be achieved, and the flow rate and cooling intensity can be quickly adjusted to achieve precise control of the coolant temperature at the inlet of the electronic water pump.

[0040] Thirdly, its closed-loop control of the opening enables on-demand distribution of EGR cooler water volume. It can not only adjust the temperature of the cooled EGR exhaust gas within a wide temperature range (40℃~120℃), but also stabilize the temperature of the cooled EGR exhaust gas near a lower target temperature, thereby improving fuel consumption.

[0041] Furthermore, in extremely cold winter environments, the method and product of this invention, through the control of the EGR valve, introduce EGR exhaust gas to heat the coolant, and then use the heated coolant to keep the low-temperature battery warm, which can accelerate the battery heating speed and reduce the power consumption of the power battery under extreme conditions. In the event of a fault where the battery temperature is too low and the power battery cannot discharge, this heating strategy provides a convenient solution for handling battery faults.

[0042] It should be noted that the terms "first," "second," and similar terms used in this article are merely for describing the constituent elements of the technical solution and do not constitute a limitation on the technical solution, nor should they be interpreted as an indication or implication of the importance of the corresponding elements; elements with terms such as "first," "second," or similar terms indicate that at least one of the elements is included in the corresponding technical solution. Attached Figure Description

[0043] To more clearly illustrate the technical solution of the present invention and facilitate a further understanding of its technical effects, features, and objectives, the present invention will be described in detail below with reference to the accompanying drawings. The drawings constitute an essential part of the specification and are used together with Embodiment 1 of the present invention to illustrate the technical solution of the present invention, but do not constitute a limitation on the present invention.

[0044] The same reference numerals in the attached diagrams represent the same parts, specifically: Figure 1 This is a schematic diagram of the gas-side system structure of the EGR system in related technologies.

[0045] Figure 2 This is a schematic diagram of the cooling water cooling system structure of the EGR system in related technologies.

[0046] Figure 3 This is a schematic diagram of the temperature control system structure in an embodiment of the present invention.

[0047] Figure 4 This is a schematic diagram of the core processes and signal states of the method and product embodiments of the present invention.

[0048] Figure 5 This is a schematic diagram of the core physical process of the method and product embodiments of the present invention.

[0049] Figure 6 This is a schematic diagram of the structural composition of an embodiment of the method of the present invention.

[0050] Figure 7 This is a schematic diagram of the structural composition of an embodiment of the thermal management device of the present invention.

[0051] Figure 8 This is a schematic diagram illustrating the structural composition of the thermal management device, storage medium, thermostat, and vehicle embodiment of the present invention. Figure 1 .

[0052] Figure 9 This is a schematic diagram illustrating the structural composition of the thermal management device, storage medium, thermostat, and vehicle embodiment of the present invention. Figure 2 .

[0053] Figure 10 This is a schematic diagram illustrating the structural composition of the thermal management device, storage medium, thermostat, and vehicle embodiment of the present invention. Figure 3 .

[0054] Figure 11 This is a schematic diagram illustrating the structural composition of the thermal management device, storage medium, thermostat, battery management system, and vehicle embodiment of the present invention.

[0055] in: 011 - Process parameters of the first heat exchange system; 022 - Process parameters for the second and third heat exchange systems; 100 - First information detection step; 110 - First working condition vector information; 120 - First temperature vector information; 200 - Second pipeline switching procedure; 201 - Piping in its first state; 202 - Piping Second State; 203 - Piping third state; 204 - Piping fourth state; 205 - Piping fifth state; 206 - Piping sixth state; 207 - Piping in seventh state; 300 - Third temperature adjustment step; 303 - Third adjustment process; 305 - Fifth adjustment process; 333 - Third temperature target value / set value; 335 - Fourth temperature target value / set value; 400 - Fourth Operating Condition Optimization Steps; 710 - Cooler air side; 711 - High-temperature exhaust gas; 712 - Engine exhaust pipe; 713 - Airflow passing through the EGR valve; 714 - Engine intake manifold or intake piping; 715 - Low-temperature exhaust gas after cooling; 716-EGR valve; 717-EGR differential pressure sensor; 718-EGR temperature sensor; 719-EGR cooler; 720 - Cooler water side; 721 - Cooling water pump; 722 - Engine radiator; 723 - Fan; 724-EGR cooler outlet; 726 - The outlet of the cooling water passage of the engine block; 727 - Engine coolant temperature; 728 - Cooling water system of the engine block; 800-Effective Thermal Management Device 801 - The third heat exchange component, namely the independent radiator for hybrid vehicles; 802 - Power Battery Coolant Heater; 803 - Expansion Tank / Jug; 804 - The third temperature, namely the coolant temperature at the inlet of the circulating pump; 805 - First power component or circulating pump; 806 - First heat exchange component, i.e., internal cooling component of the power battery; 807 - Second heat exchange component, i.e., EGR cooling component; 808 - Second temperature, i.e., EGR coolant temperature; 809 - Second inlet valve; 810 - Second outlet valve; 811 - First temperature, i.e., battery pack coolant temperature; 812 - Second Bypass Branch; 813 - First inlet valve; 814 - One of the following: control valve assembly, valve control device, linkage mechanism, thermostat, or actuator; 815 - First outlet valve; 816 - Forced gas circulation power unit or fan; 817 - Second Bypass Branch; 818 - Fourth Bypass Branch Road; 819 - Heat exchange medium; 820 - Ambient temperature; 821-EGR exhaust gas flow rate; 822-EGR system diagnostic requirement signals; 823 - vehicle speed; 824 - Engine speed; 825 - Engine load; 831 - First Demand Level, i.e., power battery cooling demand level; 843 - Temperature control third scenario: status of each actuator and physical process / status; 850 - The on / off valve or regulating valve is in the closed state; 851 - On / off valve or regulating valve in open state; 860 - Actuating part of the actuator; 870 - Temperature control scenarios; 871 - Physical processes / states in temperature control scenarios; 888-EGR exhaust gas temperature; 900 - Vehicles; 901 - Thermostat; 903 - Computer storage media; 905 - Battery Management System (BMS); 907 - Thermal Management Device. Detailed Implementation

[0056] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Of course, the specific embodiments described below are merely illustrative of the technical solutions of the present invention, and not intended to limit the invention. Furthermore, the parts described in the embodiments or drawings are merely illustrative examples of relevant parts of the present invention, and not the entirety of the invention.

[0057] The method embodiments of the present invention can be used in the thermal management device and control method of the EGR system of a hybrid vehicle engine, by connecting the cooling water circuit of the EGR system to the cooling water circuit of the hybrid vehicle power battery pack in a bypass manner, and using an electronic thermostat to control the coolant flow of each branch circuit.

[0058] Specifically, such as Figure 3 , Figure 4 , Figure 5 , Figure 6 The temperature control method shown includes a first information detection step 100, a second pipeline switching step 200, and a third temperature adjustment step 300; wherein, the first information detection step 100 acquires first operating condition vector information 110 and / or first temperature vector information 120, the first operating condition vector information 110 including information used to characterize... Figure 8 , Figure 9 , Figure 10 , Figure 11The combination of physical quantities of the vehicle 900's operating state shown; the first temperature vector information 120 includes at least one of a first temperature 811, a second temperature 808, and a third temperature 804; the first temperature 811 is the temperature at the preset sampling position of the heat exchange medium of the first heat exchange component 806, the second temperature 808 is the temperature at the preset sampling position of the heat exchange medium of the second heat exchange component 807, and the third temperature 804 is the temperature at the preset sampling position of the heat exchange medium of the third heat exchange component 801; the second pipeline switching step 200 adjusts the control valve group 814 according to the first operating condition vector information 110. The on / off state and / or opening degree; the control valve group 814 can be a thermostat or a valve combination including a first inlet valve 813, a second inlet valve 809, a first outlet valve 815, and a second outlet valve 810; wherein, if the values ​​of each component of the first temperature vector information 120 are all less than the first adjustment threshold C1, then all control valves in the control valve group 814 are closed; if all control valves in the control valve group 814 are closed, then the third temperature adjustment step 300 prohibits the first power component 805 from doing work, and the heat exchange medium 818 in the temperature control circulation pipeline of its vehicle 900 has no circulation process.

[0059] Among them, the electronic thermostat or control valve assembly 814 is the core component of the EGR thermal management device 907. Based on the power battery cooling demand level (i.e., the first demand level), the temperature signal from the EGR exhaust gas temperature sensor, the temperature signal from the battery pack coolant temperature sensor A (i.e., the first temperature), the temperature signal from the engine EGR coolant temperature sensor B (i.e., the second temperature), the temperature signal from the electronic water pump 805 inlet temperature sensor C (i.e., the third temperature), the ambient temperature signal 820, the EGR exhaust gas flow rate 821, the EGR system flow diagnosis demand signal 822, the power battery heating demand level (i.e., the first demand level), vehicle speed 823, engine speed 824, engine load 825, and other input signals, it determines which stage of thermal management is in, and then rotates the electronic thermostat ball valve or adjusts the control valve assembly 814 to open the electronic thermostat at different angles or to put the control valve assembly in different combinations, thereby placing the thermal management device 907 into different states. Figure 5 The temperature scenario 870 is shown in stages 1 to 7, and then, if necessary, the thermal management control state machine state information is output.

[0060] Specifically, in stage 1: when the hybrid power system is shut down and the temperature of each coolant temperature sensor in the cooling circulation loop is lower than the threshold C1 (calibrated quantity, shutdown water temperature threshold), it is determined that the hybrid vehicle powertrain is in shutdown condition, and inlet 1, inlet 2, outlet 1, and outlet 2 are all closed, and the target opening degree of the thermostat ball valve is 1; the coolant in the cooling circulation loop does not flow during this stage.

[0061] Furthermore, the first information detection step 100 can obtain the first demand level of the first heat exchange component 806; the first demand level 831 can be provided by the battery management system or determined according to the real-time value or current value range of the first temperature vector information 120; each valve in the control valve group 814 includes a switching valve and / or a regulating valve, the switching valve has two states of open and closed, and the regulating valve is a valve with variable or continuously variable opening degree.

[0062] Specifically, if the value of the first demand level 831 is less than the second adjustment threshold C2, the first inlet valve 813 and the first outlet valve 815 are closed, and the second inlet valve 809 and the second outlet valve 810 are opened; at the same time, the first power component 805 is activated to start the circulation process of the heat exchange medium 818; if there is a regulating valve in the second inlet valve 809 and / or the second outlet valve 810, the regulating valve is set to a preset second opening degree, which can be calibrated by the laboratory.

[0063] That is to say Figure 3 , Figure 4 Phase 2 shown: When the hybrid vehicle powertrain is activated, the engine has not yet started, the EGR valve has not yet opened, and the hybrid battery cooling demand level (the battery cooling demand level is provided by the battery management system or determined based on the battery coolant temperature being within a specific temperature range) is lower than the threshold C2 (calibrated value, small loop enabling cooling level threshold), which is determined to be the small loop operating condition. Inlet 1 and outlet 1 are closed, and inlet 2 and outlet 2 are opened, with the output thermostat ball valve at the target opening degree 2. In this phase, after the coolant absorbs the heat from the battery pack, it flows directly into the EGR cooler to heat it, and then flows into the small loop bypass branch. After the EGR cooler is heated, it can prevent the EGR exhaust gas from encountering the low-temperature EGR cooler and causing particulate matter crystallization or water vapor condensation after the EGR valve is opened.

[0064] Furthermore, if the value of the first demand level 831 is greater than the second adjustment threshold C2 and the value of the first demand level 831 is less than the third adjustment threshold C3, or if the second temperature 808 of the engine of vehicle 900 is greater than the fourth adjustment threshold C4 and the second temperature 808 is less than the fifth adjustment threshold C5, then the first water inlet valve 813 is closed and the other control valves in the control valve group 814 are opened; if the control valves in the control valve group 814 that are not closed include regulating valves, then the initial opening degree of the unclosed control valves is set to a preset third opening degree C6, which can also be calibrated by the laboratory.

[0065] Furthermore, using a regulating valve as the actuator, PI control or other closed-loop control is employed to adjust the preset third target temperature of the third temperature 804 and the first deviation ΔT1 of the third temperature 804; wherein, the P part adjustment factor C7 of the PI control is calibrated according to the first demand level 831 and the first deviation ΔT1, and its I part adjustment factor C8 can be calibrated according to the first deviation ΔT1; its third target temperature is obtained by combining the base target temperature C9 and the ambient temperature correction coefficient C10, and its base target temperature C9 can be calibrated according to the first demand level 831 and the third temperature 804, and its ambient temperature correction coefficient C10 can be calibrated by the ambient temperature 820.

[0066] That is to say Figure 3 Phase 3 shown: When the hybrid vehicle powertrain is activated, the hybrid battery cooling demand level is greater than C2 (calibrated value, small loop enabling cooling level threshold) and less than C3 (calibrated value, large loop enabling cooling level threshold), or the engine is running, the temperature of EGR coolant temperature sensor B is greater than C4 (calibrated value, EGR coolant temperature threshold) and less than C5 (calibrated value, EGR coolant temperature over-temperature threshold). To increase the cooling capacity of thermal management, this is determined to be a phase of alternating large and small loops. Inlet 1 is closed, and outlet 1, inlet 2, and outlet 2 are all open. In this phase, the coolant flowing out of the battery pack absorbs a large amount of heat through the EGR cooler, enters the electronic thermostat, and then flows into the small loop branch or the radiator water tank branch for heat dissipation. The electronic thermostat 814 can be based on... The pre-controlled opening degree C6 of the thermostat ball valve is calculated based on the hybrid battery cooling demand level and EGR exhaust gas flow rate (two-dimensional calibration value, with the hybrid battery cooling demand level on the horizontal axis and the EGR exhaust gas flow rate on the vertical axis). Then, PI control is performed based on the temperature deviation ΔT1 between the target temperature and the actual temperature (measured by the electronic water pump inlet temperature sensor C). By reasonably calibrating the P part adjustment factor C7 (two-dimensional calibration value, with the hybrid battery cooling demand level on the horizontal axis and the temperature deviation ΔT1 on the vertical axis) and the I part adjustment factor C8 (one-dimensional calibration value, with the temperature deviation ΔT1 on the vertical axis), closed-loop control of the electronic thermostat opening degree is performed, outputting the target opening degree 3 of the thermostat ball valve. This achieves alternating large and small circulation cooling water circuits, rapidly adjusting the flow rate and cooling intensity, and achieving precise control of the coolant temperature.

[0067] The aforementioned electronic water pump inlet temperature, i.e. the target temperature of the third temperature, is obtained by multiplying the basic target temperature C9 (two-dimensional calibration, with the horizontal axis representing the hybrid battery cooling requirement level and the vertical axis representing the electronic water pump inlet temperature sensor C temperature signal) by the ambient temperature correction coefficient C10 (one-dimensional calibration, with the axis representing the ambient temperature).

[0068] Furthermore, if the value of the first demand level 831 is greater than the third adjustment threshold C3 or the third temperature 804 is greater than the fourth temperature threshold C11, and the vehicle 900 engine is in operation and the second temperature 808 is greater than the fifth temperature threshold C5, then the first water inlet valve 813 and the second water outlet valve 810 are closed, and the second water inlet valve 809 and the first water outlet valve 815 are opened; the second water inlet valve 809 and / or the first water outlet valve 815 are adjusted to the preset fourth target opening, and the power output of the first power component 805 is increased to the fourth power value or the fourth power range.

[0069] That is to say Figure 3 Phase 4: When the hybrid vehicle powertrain is activated, the hybrid battery cooling demand level is greater than C3 (calibrated value, large circulation enabling cooling level threshold) or the temperature of the electronic water pump inlet temperature sensor C is greater than the threshold C11 (calibrated value, water pump inlet temperature large circulation threshold), while the engine is running and the temperature of the EGR coolant temperature sensor B is greater than C5 (calibrated value, EGR coolant temperature over-temperature threshold), it is determined to be the large circulation phase. Inlet 1 and outlet 2 are closed, inlet 2 and outlet 1 are opened, and the thermostat ball valve is opened to the target opening degree 4. In this phase, the cooling capacity of the entire cooling loop is released to the maximum extent. With the increase in the speed of the electric water pump, the cooling capacity will be further enhanced. The coolant flowing out of the battery pack flows through the EGR cooler and the electronic thermostat, and then flows into the radiator water tank branch for heat dissipation.

[0070] Furthermore, if the value of the first demand level 831 is greater than the third adjustment threshold C3 or the third temperature 804 is greater than the fourth temperature threshold C11, and simultaneously the vehicle 900 engine is in operation and the second temperature 808 is less than the fifth temperature threshold C5, then the second water outlet valve 810 is closed, and the remaining control valves of the control valve group 814 are opened, so that the opening degree of one of the regulating valves is the fifth opening degree; this fifth opening degree is calibrated by the second temperature 808 and the EGR exhaust gas flow rate 821; using the regulating valve corresponding to the fifth opening degree as the actuating component, PI control or other closed-loop control is used to adjust the preset second target temperature of the second temperature 808 and the second deviation △T2 of the second temperature 808; wherein, the P part adjustment factor C13 of the PI control can be calibrated according to the target value of the EGR exhaust gas temperature and the second deviation △T2, and its I part adjustment factor C14 can be calibrated according to the second deviation △T2; and the opening degree of the unclosed regulating valve in the control valve is adjusted according to the PI control.

[0071] That is to say Figure 3Stage 5 as shown: When the hybrid vehicle powertrain is activated, the hybrid battery cooling demand level is greater than C3 (calibrated value, large-cycle enabling cooling level threshold) or the temperature of the electronic water pump inlet temperature sensor C is greater than the threshold C11 (calibrated value, large-cycle water pump inlet temperature threshold), while simultaneously meeting engine operation requirements, the temperature of the EGR coolant temperature sensor B is less than C5 (calibrated value, EGR coolant temperature over-temperature threshold), thus determining it as the large-cycle EGR precise cooling stage. Inlet 1, inlet 2, and outlet 1 are all open, while outlet 2 is closed. The coolant flowing from the battery pack, partly flows through the EGR cooler into the electronic thermostat, and partly flows through the diagnostic branch into the thermostat. After being collected by the thermostat, all of it flows into the radiator water tank branch for cooling. The electronic thermostat 814 can be based on the EGR temperature sensor temperature (e.g., ... Figure 1 The sensor is installed downstream of the cooler to measure the exhaust gas temperature after EGR cooler cooling and the EGR exhaust gas flow rate. A pre-controlled opening C12 (two-dimensional calibrated value, with the EGR temperature sensor temperature on the horizontal axis and the EGR exhaust gas flow rate on the vertical axis) is calculated for the thermostat ball valve. Then, PI control is performed based on the temperature deviation ΔT2 between the target and actual EGR exhaust gas temperatures after cooling. By reasonably calibrating the P-part adjustment factor C13 (two-dimensional calibrated value, with the target EGR exhaust gas temperature on the horizontal axis and the temperature deviation ΔT2 on the vertical axis) and the I-part adjustment factor C14 (one-dimensional calibrated value, with the temperature deviation ΔT2 on the vertical axis), closed-loop control of the electronic thermostat opening is achieved, outputting the target opening of the thermostat ball valve 5, thus realizing… The EGR cooler's water volume is distributed on demand to control the EGR exhaust gas temperature to remain stable near a relatively low target temperature. Lower exhaust gas temperature can increase the EGR exhaust gas intake, improve the EGR rate, and reduce engine fuel consumption. Among them, the high-pressure EGR system can reduce the exhaust gas temperature after EGR cooler cooling to 45℃~60℃ to further increase exhaust gas density, which further increases the EGR exhaust gas intake volume. The target temperature of the cooled EGR exhaust gas is obtained by multiplying the EGR base target temperature (two-dimensional calibrated value, with engine speed on the horizontal axis and engine load on the vertical axis) by a temperature correction coefficient (two-dimensional calibrated value, with engine intake air temperature on the horizontal axis and engine EGR coolant temperature sensor B measured on the vertical axis).

[0072] Specifically, the aforementioned physical quantities can be at least one of the following: ambient temperature 820, EGR exhaust gas flow rate 821, EGR diagnostic demand signal 822, vehicle speed 823, engine speed 824, and engine load 825; the vehicle 900 can be a hybrid electric vehicle (HEV) or a plug-in hybrid electric vehicle (PHEV); the heat source of the first heat exchange component 806 can be the power battery pack of the vehicle 900; the first power component 805 can be a water pump component or other device that provides circulating power for the heat exchange medium; and the target value of the exhaust gas temperature in the closed-loop control can be selected to be between 45 and 60 degrees Celsius.

[0073] Furthermore, such as Figure 6 As shown, the method may further include a fourth diagnostic optimization step 400; wherein, if the first operating condition vector information 110 contains valid EGR flow diagnostic request information, then the second inlet valve 809 and the second outlet valve 810 are closed, and the first inlet valve 813 and the first outlet valve 815 are opened, and the opening degree of the control valve group 814 is adjusted to the sixth preset opening degree; wherein, the opening degree of the control valve group 814 represents the opening degree of the regulating valves participating in flow regulation in the valve group, or it can be the opening degree calculated after combining multiple regulating valves.

[0074] Specifically, if the increase in the second temperature 808 within a preset time period is greater than the sixth temperature rise threshold, an EGR pipeline normal signal is output; conversely, if the increase in the second temperature 808 within a preset time period is less than the sixth temperature rise threshold, an EGR pipeline fault signal is output.

[0075] like Figure 3 Stage 6 shown is the EGR system flow fault diagnosis stage. After the engine management system (EMS) triggers the EGR flow diagnosis request, it closes inlet 2 and outlet 2, opens inlet 1 and outlet 1, and outputs the target opening degree 6 of the thermostat ball valve. The coolant flowing out of the battery pack flows through the diagnostic bypass branch and the electronic thermostat before flowing into the radiator water tank branch for heat dissipation. At this time, the coolant in the EGR cooler cannot flow, and the cooling effect of the cooler on the high-temperature EGR exhaust gas is weakened. This allows the high-temperature EGR exhaust gas to continuously heat the EGR temperature sensor, making the temperature rise of the EGR temperature sensor faster and more obvious.

[0076] Specifically, under normal EGR pipeline conditions, the EGR temperature sensor can achieve a significant temperature rise due to the continuous heating of the high-temperature EGR exhaust gas; when the EGR pipeline is blocked, the high-temperature EGR exhaust gas cannot pass through, and the temperature rise of the EGR temperature sensor is very small; based on this, it is possible to clearly distinguish whether there is a flow failure in the EGR system.

[0077] Furthermore, if the first operating condition vector information 110 includes low temperature warning information or the ambient temperature 820 is less than or equal to the preset seventh adjustment threshold, then the first demand level 831 information is replaced with the second demand level 832 information, and the first inlet valve 813 and the second outlet valve 810 are closed, while the second inlet valve 809 and the first outlet valve 815 are opened, and the opening degree of the control valve group 814 is adjusted to the seventh preset opening degree; the second demand level 832 is provided by the battery management system with the power battery heating demand or the current temperature information of the power battery; at the same time, the heat exchange medium is heated through the third heat exchange component 801.

[0078] likeFigure 3 Stage 7 shown is the low-temperature battery heating stage in extremely cold winter environments. Once the battery charge is too low and the need for heating is triggered, the engine is run, the EGR valve is opened, the inlet 1 and outlet 2 are closed, the inlet 2 and outlet 1 are opened, and the thermostat ball valve is opened to the target opening degree 7. At this time, the coolant flowing out of the battery pack flows through the EGR cooler and is heated. Then, it flows through the electronic thermostat 814 and flows into the radiator water tank branch for further electric heating, so as to achieve a rapid increase in coolant temperature and thus provide more heating for the low-temperature battery. In this special scenario, by running the engine and opening the EGR valve, an appropriate EGR exhaust gas flow can be introduced to accelerate the battery heating speed and reduce the power battery charge consumption under extreme conditions.

[0079] Furthermore, such as Figure 7 The thermal management device 907 shown includes a first information detection unit 701, a second pipeline switching unit 702, and a third temperature regulation unit 703; wherein, the first information detection unit 701 acquires first operating condition vector information 110 and / or first temperature vector information 120, and the first operating condition vector information 110 includes information used to characterize, for example, Figures 8 to 11 The combination of physical quantities of the vehicle 900's operating state; its first temperature vector information 120 includes at least one of a first temperature 811, a second temperature 808, and a third temperature 804; the first temperature 811 is the temperature at the preset sampling position of the heat exchange medium of the first heat exchange component 806, the second temperature 808 is the temperature at the preset sampling position of the heat exchange medium of the second heat exchange component 807, and the third temperature 804 is the temperature at the preset sampling position of the heat exchange medium of the third heat exchange component 801; the second pipeline switching unit 702 adjusts according to the first operating condition vector information 110. The on / off state and / or opening degree of the control valve group 814; the control valve group 814 includes a first inlet valve 813, a second inlet valve 809, a first outlet valve 815, and a second outlet valve 810; if the values ​​of each component of the first temperature vector information 120 are all less than the first adjustment threshold C1, then all control valves in the control valve group 814 are closed; if all control valves in the control valve group 814 are closed, then the third temperature regulation unit 703 prohibits the first power component 805 from doing work, and the heat exchange medium 818 in the temperature control circulation pipeline of the vehicle 900 is in a non-circulation process.

[0080] Specifically, in the thermal management device 907, an electronic water pump is used to provide power for the circulation of coolant. After being pumped out by the electronic water pump, the coolant flows continuously into the hybrid vehicle's power battery pack to cool the battery. Finally, it flows through the battery pack coolant temperature sensor A to obtain the first temperature 811, and then flows out of the power battery pack.

[0081] Subsequently, the coolant is divided into two paths. One path flows into the EGR cooler, namely the second heat exchange component 807, to cool the EGR exhaust gas. After flowing out of the cooler, it passes through the engine EGR coolant temperature sensor B to obtain the second temperature 808, and then passes through the thermostat 814, namely the control valve group, so that the water inlet 2 flows into the electronic thermostat 814 through the second water inlet valve 809. The other path flows into the diagnostic bypass line, through the water inlet 1 of the thermostat 814, and into the electronic thermostat through the first water inlet valve 813. The two paths of water will merge in the electronic thermostat 814 and then flow out from the electronic thermostat outlet 1 and the electronic thermostat outlet 2 respectively through the first water outlet valve 815 and the second water outlet valve 810.

[0082] Specifically, the coolant flowing out of the outlet 1 of the electronic thermostat 814 flows to the independent radiator 801 of the hybrid vehicle, which is the first heat exchange component. The radiator is equipped with a power battery coolant heater to heat the coolant (generally it works when the battery temperature is too low). In addition, a fan is installed outside the radiator for cooling.

[0083] Furthermore, the low-temperature coolant after being cooled by the radiator is divided into two streams: one stream flows directly to the electric water pump, and the other stream flows through the expansion tank and then to the electric water pump.

[0084] Specifically, the coolant flowing out of the outlet 2 of the electronic thermostat 814 flows to the electronic water pump through a small circulation bypass branch; the three streams of water flowing to the electronic water pump first merge and then flow through the coolant temperature sensor C at the inlet of the electric water pump to obtain the third temperature 804, and then flow back to the electronic water pump 805. After the electronic water pump rotates, it continuously flows to the hybrid vehicle power battery pack 806.

[0085] In the thermal management device 907, the battery coolant temperature sensor A is used to monitor the temperature of the battery after cooling, i.e., the first temperature; to prevent the battery from overheating, and to provide the measured temperature value for thermal management control.

[0086] Specifically, the engine EGR coolant temperature sensor B acquires a second temperature 808, which is used to monitor the coolant temperature of the EGR cooler, prevent the cooler from overheating, and provide measured temperature values ​​for thermal management control and EGR system high and low flow fault diagnosis.

[0087] Specifically, the coolant temperature C at the inlet of the electric water pump, i.e. the third temperature, is used to monitor the coolant temperature after heat dissipation, heating, or merging, and provides the measured temperature value for thermal management control.

[0088] The electronic thermostat in the thermal management device 907 is designed with two inlets and two outlets, namely inlet 1, inlet 2, outlet 1, and outlet 2. It is controlled by the first inlet valve 813, the second inlet valve 809, the first outlet valve 815, and the second outlet valve 810 for on / off control or flow regulation.

[0089] In this circuit, inlet 1 is connected to bypass branch 812, inlet 2 is connected to EGR cooler branch 807, outlet 1 is connected to radiator branch 801, and outlet 2 is connected to small circulation bypass branch 817. With different opening angles of the electronic thermostat 814, the two inlets and two outlets will open and close, thus connecting different cooling circuits.

[0090] Specifically, the thermal management device 907 can adopt an independent radiator tank of the hybrid vehicle, with a coolant heater installed inside the tank to achieve rapid cooling and heating of the coolant; in addition, the cooling fan 816 near the radiator tank can achieve different fan speeds according to different cooling needs; at the same time, the electronic water pump 805 in the thermal management device 907 can adjust its own speed to achieve the flow rate of coolant in the cooling circulation channel based on the cooling needs of thermal management.

[0091] Further, the first information detection unit 701 acquires the first demand level 831 of the first heat exchange component 806; the first demand level 831 can be provided by the battery management system or determined according to the real-time value or current value range of the first temperature vector information 120; each valve in the control valve group 814 includes a switching valve and / or a regulating valve, the switching valve having two states of open and closed, and the regulating valve being a valve with graded or continuously variable opening; if the value of the first demand level 831 is less than the second adjustment threshold C2, the first inlet valve 813 and the first outlet valve 815 are closed, and the second inlet valve 809 and the second outlet valve 810 are opened; at the same time, the first power component 805 is activated to perform work, starting the circulation process of the heat exchange medium 818; if there is a regulating valve in the second inlet valve 809 and / or the second outlet valve 810, the regulating valve is set to a preset second opening degree, which can be calibrated by the laboratory.

[0092] Furthermore, if the value of the first demand level 831 is greater than the second adjustment threshold C2 and the value of the first demand level 831 is less than the third adjustment threshold C3, or if the second temperature 808 of the engine of vehicle 900 is greater than the fourth adjustment threshold C4 and the second temperature 808 is less than the fifth adjustment threshold C5, then the first water inlet valve 813 is closed and the other control valves in the control valve group 814 are opened; if the control valves in the control valve group 814 that are not closed include regulating valves, then the initial opening degree of the unclosed control valves can be set to a preset third opening degree C6, which can be calibrated by the laboratory.

[0093] Furthermore, using a regulating valve as the actuator, PI control or other closed-loop control is employed to adjust the preset third target temperature of the third temperature 804 and the first deviation ΔT1 of the third temperature 804. The P-part adjustment factor C7 of the PI control can be calibrated according to the first demand level 831 and the first deviation ΔT1, and the I-part adjustment factor C8 can be calibrated according to the first deviation ΔT1. The third target temperature can be obtained by combining the base target temperature C9 and the ambient temperature correction coefficient C10. The base target temperature C9 can be calibrated according to the first demand level 831 and the third temperature 804, and the ambient temperature correction coefficient C10 can be calibrated according to the ambient temperature 820.

[0094] Furthermore, if the value of the first demand level 831 is greater than the third adjustment threshold C3 or the third temperature 804 is greater than the fourth temperature threshold C11, and the vehicle 900 engine is in operation and the second temperature 808 is greater than the fifth temperature threshold C5, then the first water inlet valve 813 and the second water outlet valve 810 are closed, and the second water inlet valve 809 and the first water outlet valve 815 are opened; the second water inlet valve 809 and / or the first water outlet valve 815 are adjusted to the preset fourth target opening, and the power output of the first power component 805 is increased to the fourth power value or the fourth power range.

[0095] Furthermore, if the value of the first demand level 831 is greater than the third adjustment threshold C3 or the third temperature 804 is greater than the fourth temperature threshold C11, and simultaneously the vehicle 900 engine is in operation and the second temperature 808 is less than the fifth temperature threshold C5, then the second water outlet valve 810 is closed, and the remaining control valves of the control valve group 814 are opened, so that the opening degree of one of the regulating valves is the fifth opening degree; this fifth opening degree can be calibrated by the second temperature 808 and the EGR exhaust gas flow rate 821; using the regulating valve corresponding to the fifth opening degree as the actuating component, PI control or other closed-loop control is used to adjust the preset second target temperature of the second temperature 808 and the second deviation △T2 of the second temperature 808; wherein, the P part adjustment factor C13 of the PI control can be calibrated according to the target value of the EGR exhaust gas temperature and the second deviation △T2, and the I part adjustment factor C14 can be calibrated according to the second deviation △T2; and the opening degree of the unclosed regulating valve in the control valve is adjusted according to the PI control.

[0096] Specifically, the aforementioned physical quantities can be at least one of the following: ambient temperature 820, EGR exhaust gas flow rate 821, EGR diagnostic demand signal 822, vehicle speed 823, engine speed 824, and engine load 825; the vehicle 900 can be a hybrid electric vehicle (HEV) or a plug-in hybrid electric vehicle (PHEV); the heat source of its first heat exchange component 806 is the vehicle 900's power battery pack, battery group, or other device to be cooled or insulated; the first power component 805 can be a water pump component or other device that provides circulating power for the heat exchange medium; wherein, the target value of the exhaust gas temperature in the closed-loop control can be selected to be between 45 and 60 degrees Celsius.

[0097] Furthermore, such as Figures 8 to 11 The thermal management device 907 shown may further include a fourth diagnostic optimization unit 704; wherein, If the first operating condition vector information 110 contains valid EGR flow diagnosis request information, then the second inlet valve 809 and the second outlet valve 810 are closed, and the first inlet valve 813 and the first outlet valve 815 are opened, and the opening degree of the control valve group 814 is adjusted to the sixth preset opening degree; if the increase value of the second temperature 808 within the preset time length is greater than the sixth temperature rise threshold, then an EGR pipeline normal signal is output; otherwise, if the increase value of the second temperature 808 within the preset time length is less than the sixth temperature rise threshold, then an EGR pipeline fault signal is output.

[0098] Furthermore, if the first operating condition vector information 110 includes low temperature warning information or the ambient temperature 820 is less than or equal to the preset seventh adjustment threshold, then the first demand level 831 information is replaced with the second demand level 832 information, and the first inlet valve 813 and the second outlet valve 810 are closed, while the second inlet valve 809 and the first outlet valve 815 are opened, and the opening degree of the control valve group 814 is adjusted to the seventh preset opening degree; the second demand level 832 is provided by the battery management system with the power battery heating demand or the current temperature information of the power battery; at the same time, the heat exchange medium is heated through the third heat exchange component 801.

[0099] Furthermore, such as Figures 8 to 11 A computer storage medium 903 is also disclosed, including a storage medium body for storing a computer program; when the computer program is executed by a microprocessor, it can implement any of the temperature control methods described above.

[0100] Similarly, such as ​ The thermostat includes any of the above thermal management devices 907 and / or any of the above storage media 903; wherein the vehicle 900 includes the above thermal management device 907; and / or any of the above storage media 903; and / or any of the above thermostats 901; wherein the first demand level 831 of the thermal management device 907 is provided by the battery management system 905.

[0101] It should be noted that the above embodiments are only for more clearly illustrating the technical solution of the present invention. Those skilled in the art will understand that the implementation of the present invention is not limited to the above content. Any obvious changes, substitutions or replacements made based on the above content do not exceed the scope of the technical solution of the present invention. Other implementations will also fall within the scope of the present invention without departing from the concept of the present invention.

Claims

1. A temperature control method, characterized in that, include: The steps include: first information detection step (100), second pipeline switching step (200), and third temperature adjustment step (300); among which... The first information detection step (100) acquires first operating condition vector information (110) and / or first temperature vector information (120). The first operating condition vector information (110) includes a combination of physical quantities used to characterize the operating state of the vehicle (900). The first temperature vector information (120) includes at least one of a first temperature (811), a second temperature (808), and a third temperature (804). The first temperature (811) is the temperature at a preset sampling position of the heat exchange medium of the first heat exchange component (806), the second temperature (808) is the temperature at a preset sampling position of the heat exchange medium of the second heat exchange component (807), and the third temperature (804) is the temperature at a preset sampling position of the heat exchange medium of the third heat exchange component (801). The second pipeline switching step (200) adjusts the on / off state and / or opening degree of the control valve group (814) according to the first operating condition vector information (110); the control valve group (814) includes a first inlet valve (813), a second inlet valve (809), a first outlet valve (815), and a second outlet valve (810); if the value of each component of the first temperature vector information (120) is less than the first adjustment threshold C1, then all control valves in the control valve group (814) are closed; If all the control valves of the control valve group (814) are closed, the third temperature regulation step (300) prohibits the first power unit (805) from doing work, and the heat exchange medium (818) in the temperature control circulation pipeline of the vehicle (900) has no circulation process; The vehicle (900) is a hybrid electric vehicle (HEV) or a plug-in hybrid electric vehicle (PHEV); the heat source of the first heat exchange component (806) is the power battery pack of the vehicle (900); the second heat exchange component includes an EGR cooling component; and the third heat exchange component (801) is an independent radiator for hybrid vehicles.

2. The temperature control method as described in claim 1, wherein: The first information detection step (100) obtains the first demand level (831) of the first heat exchange component (806); the first demand level (831) is provided by the battery management system or determined according to the real-time value or current value range of the first temperature vector information (120); each valve in the control valve group (814) includes a switching valve and / or a regulating valve, the switching valve has two states: open and closed, and the regulating valve is a valve with a graded or continuously variable opening degree; If the value of the first demand level (831) is less than the second adjustment threshold C2, then the first inlet valve (813) and the first outlet valve (815) are closed, and the second inlet valve (809) and the second outlet valve (810) are opened; at the same time, the first power component (805) is started to perform work, and the circulation process of the heat exchange medium (818) is initiated. If there is a regulating valve in the second inlet valve (809) and / or the second outlet valve (810), the regulating valve is set to a preset second opening degree, which is calibrated by the laboratory.

3. The temperature control method as described in claim 2, wherein: If the value of the first demand level (831) is greater than the second adjustment threshold C2 and the value of the first demand level (831) is less than the third adjustment threshold C3, or the second temperature (808) when the engine of the vehicle (900) is running is greater than the fourth adjustment threshold C4 and the second temperature (808) is less than the fifth adjustment threshold C5, then the first water inlet valve (813) is closed and the other control valves in the control valve group (814) are opened; If the control valve that is not closed in the control valve group (814) includes the regulating valve, then the initial opening degree of the control valve that is not closed is set to a preset third opening degree C6, which is calibrated by the laboratory. Using the regulating valve as the actuator, PI control or other closed-loop control is used to adjust the preset third target temperature and the first deviation ΔT1 of the third temperature (804). The P part adjustment factor C7 of the PI control is calibrated according to the first demand level (831) and the first deviation ΔT1, and the I part adjustment factor C8 is calibrated according to the first deviation ΔT1. The third target temperature is obtained by combining the base target temperature C9 and the ambient temperature correction coefficient C10. The base target temperature C9 is calibrated according to the first demand level (831) and the third temperature (804), and the ambient temperature correction coefficient C10 is calibrated by the ambient temperature (820).

4. The temperature control method as described in claim 3, wherein: If the value of the first demand level (831) is greater than the third adjustment threshold C3 or the third temperature (804) is greater than the fourth temperature threshold C11, and the vehicle (900) engine is running and the second temperature (808) is greater than the fifth temperature threshold C5, then the first water inlet valve (813) and the second water outlet valve (810) are closed, and the second water inlet valve (809) and the first water outlet valve (815) are opened. Adjust the second inlet valve (809) and / or the first outlet valve (815) to a preset fourth target opening, and increase the power output of the first power unit (805) to a fourth power value or a fourth power range.

5. The temperature control method as described in claim 4, wherein: If the value of the first demand level (831) is greater than the third adjustment threshold C3 or the third temperature (804) is greater than the fourth temperature threshold C11, and the vehicle (900) engine is in operation and the second temperature (808) is less than the fifth temperature threshold C5, then the second outlet valve (810) is closed, and the remaining control valves of the control valve group (814) are opened, so that the opening degree of one of the regulating valves is the fifth opening degree; the fifth opening degree is calibrated by the second temperature (808) and the EGR exhaust gas flow (821); using the regulating valve corresponding to the fifth opening degree as the actuating component, PI control or other closed-loop control is used to adjust the preset second target temperature of the second temperature (808) and the second deviation △T2 of the second temperature (808), the P part adjustment factor C13 of the PI control is calibrated according to the target value of the EGR exhaust gas temperature and the second deviation △T2, and the I part adjustment factor C14 is calibrated according to the second deviation △T2; and the opening degree of the unclosed regulating valve in the control valve is adjusted according to the PI control.

6. The temperature control method as described in claim 5, wherein, The physical quantities include at least one of the following: ambient temperature (820), EGR exhaust gas flow rate (821), EGR diagnostic demand signal (822), vehicle speed (823), engine speed (824), and engine load (825); the first power unit (805) includes a water pump component or other device that provides circulating power for the heat exchange medium; the target value of the exhaust gas temperature in the closed-loop control is between 45 and 60 degrees Celsius.

7. The temperature control method according to any one of claims 3 to 5, further comprising a fourth diagnostic optimization step (400); wherein, If the first operating condition vector information (110) contains valid EGR flow diagnostic request information, then the second inlet valve (809) and the second outlet valve (810) are closed, and the first inlet valve (813) and the first outlet valve (815) are opened, and the opening degree of the control valve group (814) is adjusted to the sixth preset opening degree; if the increase value of the second temperature (808) within the preset time length is greater than the sixth temperature rise threshold, then an EGR pipeline normal signal is output; otherwise, if the increase value of the second temperature (808) within the preset time length is less than the sixth temperature rise threshold, then an EGR pipeline fault signal is output.

8. The temperature control method as described in claim 7, wherein... If the first operating condition vector information (110) contains low temperature warning information or the ambient temperature (820) is less than or equal to the preset seventh adjustment threshold, then the first demand level (831) information is replaced with the second demand level (832) information, and the first water inlet valve (813) and the second water outlet valve (810) are closed, and the second water inlet valve (809) and the first water outlet valve (815) are opened, and the opening degree of the control valve group (814) is adjusted to the seventh preset opening degree. The second demand level (832) is given by the battery management system as the power battery heating demand or the current temperature information of the power battery. At the same time, the heat exchange medium is heated by the third heat exchange component (801).

9. A thermal management device (907), comprising a first information detection unit (701), a second pipeline switching unit (702), and a third temperature regulation unit (703); wherein, The first information detection unit (701) acquires first operating condition vector information (110) and / or first temperature vector information (120). The first operating condition vector information (110) includes a combination of physical quantities used to characterize the operating state of the vehicle (900). The first temperature vector information (120) includes at least one of a first temperature (811), a second temperature (808), and a third temperature (804). The first temperature (811) is the temperature at a preset sampling position of the heat exchange medium of the first heat exchange component (806), the second temperature (808) is the temperature at a preset sampling position of the heat exchange medium of the second heat exchange component (807), and the third temperature (804) is the temperature at a preset sampling position of the heat exchange medium of the third heat exchange component (801). The second pipeline switching unit (702) adjusts the on / off state and / or opening degree of the control valve group (814) according to the first operating condition vector information (110); the control valve group (814) includes a first inlet valve (813), a second inlet valve (809), a first outlet valve (815), and a second outlet valve (810); if the value of each component of the first temperature vector information (120) is less than the first adjustment threshold C1, then all control valves in the control valve group (814) are closed; If all the control valves of the control valve group (814) are closed, the third temperature regulating unit (703) prohibits the first power component (805) from doing work, and the heat exchange medium (818) in the temperature control circulation pipeline of the vehicle (900) has no circulation process; The vehicle (900) is a hybrid electric vehicle (HEV) or a plug-in hybrid electric vehicle (PHEV); the heat source of the first heat exchange component (806) is the power battery pack of the vehicle (900); the second heat exchange component includes an EGR cooling component; and the third heat exchange component (801) is an independent radiator for hybrid vehicles.

10. The thermal management device (907) as claimed in claim 9, wherein: The first information detection unit (701) acquires the first demand level (831) of the first heat exchange component (806); the first demand level (831) is provided by the battery management system or determined according to the real-time value or current value range of the first temperature vector information (120); each valve in the control valve group (814) includes a switching valve and / or a regulating valve, the switching valve has two states: open and closed, and the regulating valve is a valve with a graded or continuously variable opening degree; If the value of the first demand level (831) is less than the second adjustment threshold C2, then the first inlet valve (813) and the first outlet valve (815) are closed, and the second inlet valve (809) and the second outlet valve (810) are opened; at the same time, the first power component (805) is started to perform work, and the circulation process of the heat exchange medium (818) is initiated. If there is a regulating valve in the second inlet valve (809) and / or the second outlet valve (810), the regulating valve is set to a preset second opening degree, which is calibrated by the laboratory.

11. The thermal management device (907) as claimed in claim 10, wherein: If the value of the first demand level (831) is greater than the second adjustment threshold C2 and the value of the first demand level (831) is less than the third adjustment threshold C3, or the second temperature (808) when the engine of the vehicle (900) is running is greater than the fourth adjustment threshold C4 and the second temperature (808) is less than the fifth adjustment threshold C5, then the first water inlet valve (813) is closed and the other control valves in the control valve group (814) are opened; If the control valve that is not closed in the control valve group (814) includes the regulating valve, then the initial opening degree of the control valve that is not closed is set to a preset third opening degree C6, which is calibrated by the laboratory. Using the regulating valve as the actuator, PI control or other closed-loop control is used to adjust the preset third target temperature of the third temperature (804) and the first deviation △T1 of the third temperature (804). The P part adjustment factor C7 of the PI control is calibrated according to the first demand level (831) and the first deviation △T1, and the I part adjustment factor C8 is calibrated according to the first deviation △T1. The third target temperature is obtained by combining the basic target temperature C9 and the ambient temperature correction coefficient C10. The basic target temperature C9 is calibrated according to the first demand level (831) and the third temperature (804), and the ambient temperature correction coefficient C10 is calibrated by the ambient temperature (820).

12. The thermal management device (907) as claimed in claim 11, wherein: If the value of the first demand level (831) is greater than the third adjustment threshold C3 or the third temperature (804) is greater than the fourth temperature threshold C11, and the vehicle (900) engine is running and the second temperature (808) is greater than the fifth temperature threshold C5, then the first water inlet valve (813) and the second water outlet valve (810) are closed, and the second water inlet valve (809) and the first water outlet valve (815) are opened. Adjust the second inlet valve (809) and / or the first outlet valve (815) to a preset fourth target opening, and increase the power output of the first power unit (805) to a fourth power value or a fourth power range.

13. The thermal management device (907) as claimed in claim 12, wherein: If the value of the first demand level (831) is greater than the third adjustment threshold C3 or the third temperature (804) is greater than the fourth temperature threshold C11, and the vehicle (900) engine is in operation and the second temperature (808) is less than the fifth temperature threshold C5, then the second outlet valve (810) is closed, and the remaining control valves of the control valve group (814) are opened, so that the opening degree of one of the regulating valves is the fifth opening degree; the fifth opening degree is calibrated by the second temperature (808) and the EGR exhaust gas flow (821); using the regulating valve corresponding to the fifth opening degree as the actuating component, PI control or other closed-loop control is used to adjust the preset second target temperature of the second temperature (808) and the second deviation △T2 of the second temperature (808), the P part adjustment factor C13 of the PI control is calibrated according to the target value of the EGR exhaust gas temperature and the second deviation △T2, and the I part adjustment factor C14 is calibrated according to the second deviation △T2; and the opening degree of the unclosed regulating valve in the control valve is adjusted according to the PI control.

14. The thermal management device (907) as claimed in claim 13, wherein, The physical quantities include at least one of the following: ambient temperature (820), EGR exhaust gas flow rate (821), EGR diagnostic demand signal (822), vehicle speed (823), engine speed (824), and engine load (825); the first power unit (805) includes a water pump component or other device that provides circulating power for the heat exchange medium; the target value of the exhaust gas temperature in the closed-loop control is between 45 and 60 degrees Celsius.

15. The thermal management device (907) as described in any one of claims 11 to 13, further comprising a fourth diagnostic optimization unit (704); wherein, If the first operating condition vector information (110) contains valid EGR flow diagnostic request information, then the second inlet valve (809) and the second outlet valve (810) are closed, and the first inlet valve (813) and the first outlet valve (815) are opened, and the opening degree of the control valve group (814) is adjusted to the sixth preset opening degree; if the increase value of the second temperature (808) within the preset time length is greater than the sixth temperature rise threshold, then an EGR pipeline normal signal is output; otherwise, if the increase value of the second temperature (808) within the preset time length is less than the sixth temperature rise threshold, then an EGR pipeline fault signal is output.

16. The thermal management device (907) as claimed in claim 15, wherein: If the first operating condition vector information (110) contains low temperature warning information or the ambient temperature (820) is less than or equal to the preset seventh adjustment threshold, then the first demand level (831) information is replaced with the second demand level (832) information, and the first water inlet valve (813) and the second water outlet valve (810) are closed, and the second water inlet valve (809) and the first water outlet valve (815) are opened, and the opening degree of the control valve group (814) is adjusted to the seventh preset opening degree; the second demand level (832) is given by the battery management system as the power battery heating demand or the current temperature information of the power battery; at the same time, the heat exchange medium is heated by the third heat exchange component (801).

17. A computer storage medium (903), comprising: A storage medium for storing a computer program; the computer program, when executed by a microprocessor, implements the temperature control method as described in any one of claims 1 to 8.

18. A thermostat (901) comprising a thermal management device (907) as claimed in any of claims 9 to 16; and / or a storage medium (903) as claimed in any of claims 17.

19. A vehicle (900) comprising a thermal management device (907) as claimed in any one of claims 9 to 16; and / or a storage medium as claimed in claim 17; and / or a thermostat (901) as claimed in claim 18, wherein a first demand level (831) of the thermal management device (907) is provided by a battery management system (905).

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