Vehicle thermal management method based on multi-strategy universal loop

Abstract

The invention relates to a vehicle thermal management method based on a multi-strategy universal loop, and the method comprises the steps: building a unified thermal management system flow suitable for various operation strategies, and arranging thermal resistance nodes in a thermal management system operation loop according to system parts and branch conditions. By controlling the state value and the resistance value of the thermal resistance node, the on-off of the branch and the directional flow control of the heat flow in the operation loop are realized. Compared with the prior art, the method has the advantages that one general framework of the thermal management system is matched with various operation strategies, and the like.

Description

Technical Field

[0001] The present invention relates to the field of vehicle thermal management, and in particular to a vehicle thermal management method based on a multi-strategy universal loop. Background Art

[0002] With the continuous development of vehicle technology and the increasingly stringent environmental regulations, vehicle thermal management technology has become an important means to improve the overall performance of vehicles and achieve energy conservation and emission reduction. Vehicle thermal management technology improves the performance and service life of key components and enhances the efficiency of thermal energy utilization by managing and optimizing the heat flow generated by various components within the vehicle. In this process, it is essential to calculate the heat generation and heat dissipation balance and temperature changes of system components through simulation. However, the number and order of components involved in the thermal management system vary under different operating strategies. Different operating strategies have different loop structures and different forms of energy conservation equations. This brings challenges to model switching and calculation under different operating strategies, making it impossible to flexibly calculate different operating strategies in the same model. Summary of the Invention

[0003] The purpose of the present invention is to provide a vehicle thermal management method based on a multi-strategy universal loop in order to improve the efficiency of switching between different operating strategies in the same model.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A vehicle thermal management method based on a multi-strategy universal loop, the method comprising the following steps:

[0006] S1. Constructing an initial vehicle circuit, the initial vehicle circuit comprising a driving component thermal resistance, a driving component, a heat source component thermal resistance, a first heat source component, a heat dissipation or heat storage component thermal resistance, and a first heat dissipation or heat storage component connected in series in sequence, wherein the heat source component thermal resistance and the first heat source component constitute a first heat source basic unit, and the heat dissipation or heat storage component thermal resistance and the first heat dissipation or heat storage component constitute a first heat dissipation or heat storage basic unit;

[0007] The inlet of the heat source basic unit is connected to one end of the thermal resistor of the heat source component, the other end of the thermal resistor of the heat source component is connected to one end of the heat source component, and the other end of the heat source component is connected to the outlet of the heat source basic unit;

[0008] The inlet of the heat dissipation or heat storage basic unit is connected to one end of the thermal resistor of the heat dissipation or heat storage component, the other end of the thermal resistor of the heat dissipation or heat storage component is connected to one end of the heat dissipation or heat storage component, the other end of the heat dissipation or heat storage component is connected to the outlet of the heat dissipation or heat storage basic unit, the inlet of the heat dissipation or heat storage basic unit is connected to the outlet of the heat source basic unit, the outlet of the heat dissipation or heat storage basic unit is connected to one end of the thermal resistor of the driving component, the other end of the thermal resistor of the driving component is connected to one end of the driving component, and the other end of the driving component is connected to the inlet of the heat source basic unit;

[0009] S2, taking the initial vehicle loop as a current vehicle loop;

[0010] S3, taking M as the total number of heat source basic units of the vehicle thermal management system, n-1 as the total number of heat source basic units of the current vehicle loop, and n and M as integers greater than or equal to 2;

[0011] If n-1 is less than M, expanding the heat source basic unit of the current vehicle loop, connecting the nth heat source basic unit in series between one end of the nth-1 heat source basic unit of the current vehicle loop and one end of the driving component, or connecting the inlet and outlet of the nth heat source basic unit in parallel with the inlet and outlet of the nth-1 heat source basic unit of the current vehicle loop, updating n to n+1, and repeating S3;

[0012] Otherwise, performing S4;

[0013] S4, taking N as the total number of heat dissipation or storage basic units of the vehicle thermal management system, s-1 as the total number of heat dissipation or storage basic units of the current vehicle loop, and s and N as integers greater than or equal to 2;

[0014] If s-1 is less than N, expanding the heat dissipation or storage basic unit of the current vehicle loop, connecting the s-th heat dissipation or storage basic unit between the other end of the driving component and one end of the s-1-th heat dissipation or storage basic unit, setting the first thermal resistance of the s-th heat dissipation or storage basic unit between the outlet of the s-1-th heat dissipation or storage basic unit and the inlet of the s-th heat dissipation or storage basic unit, setting the second thermal resistance of the s-th heat dissipation or storage basic unit between the inlet of the s-1-th heat dissipation or storage basic unit and the inlet of the s-th heat dissipation or storage basic unit, and setting the third thermal resistance of the s-th heat dissipation or storage basic unit between the outlet of the s-th heat dissipation or storage basic unit and the driving component, at this time, the thermal resistance between the outlet of the first heat dissipation or storage basic unit and the driving component is the third thermal resistance of the first heat dissipation or storage basic unit, i.e., the driving component thermal resistance in the initial vehicle loop, the driving component thermal resistance exists in the form of the third thermal resistance of each heat dissipation or storage basic unit, updating s to s+1, and repeating S4;

[0015] Otherwise, performing S5;

[0016] S5, taking the current vehicle loop at this time as the vehicle thermal management system, the vehicle thermal management system having M heat source basic units in total and N heat dissipation or storage basic units in total, and numbering all thermal resistances in the vehicle thermal management system, wherein the number of the thermal resistance of the heat source component in the first heat source basic unit is R j,1 , and the number of the thermal resistance of the heat source component in the nth (n=2, 3, …, M) heat source basic unit is R j,n; Wherein, j indicates that the category of the thermal resistance is the thermal resistance before the heat source component in the heat source basic unit, and each thermal resistance corresponds to a state value parameter;

[0017] The thermal resistance of the first heat dissipation or heat storage unit and the third thermal resistance are numbered R k,1 and R k,2 The first thermal resistance of the sth (s=2,3…,N) heat dissipation or heat storage basic unit is R k,4s-5 The second thermal resistance of the sth (s=2,3…,N) heat dissipation or heat storage basic unit is R k,4s-4 The thermal resistance of the heat dissipation or heat storage component of the sth (s=2,3…,N) heat dissipation or heat storage basic unit is R k,4s-3 The third thermal resistance of the sth (s=2,3…,N-1) heat dissipation or heat storage basic unit is R k,4s-2 , the third thermal resistance of the Nth heat dissipation or heat storage basic unit is R k,4N-2 , k indicates that the thermal resistance category is the thermal resistance before the heat dissipation or heat storage component in the heat dissipation or heat storage component basic unit or the first thermal resistance, second thermal resistance and third thermal resistance of the heat dissipation or heat storage component, and each thermal resistance corresponds to a state value parameter;

[0018] S6. The state value decision database obtains current key indicator parameters of the vehicle thermal management system and determines an operating strategy corresponding to the current key indicator parameters, where each operating strategy corresponds to a set of determined state value parameters of all thermal resistances;

[0019] The vehicle thermal management system determines the resistance values ​​of all thermal resistors based on the state value parameters, determines the current flow path of the working fluid in the vehicle thermal management system based on the resistance values ​​of all thermal resistors, obtains the current key indicator parameters and component temperatures under the current flow path, and returns to S6.

[0020] Furthermore, the resistance of all thermal resistors is:

[0021]

[0022] Among them, R ini It represents the thermal resistance of the heat source component, heat dissipation or heat storage component and the thermal resistance of the driving component in the initial vehicle circuit. The thermal resistance of the heat source component, heat dissipation or heat storage component and the thermal resistance of the driving component in the initial vehicle circuit are equal and are all R ini , δ j,1 Indicates thermal resistance R j,1 The state value parameter, δ j,n Indicates thermal resistance R j,n The state value parameter, δ k,1 , δ k,2 , δ k,4s-6 , δ k,4s-5 , δ k,4s-4 , δk,4s-3 , δ k,4s-2 , δ k,4s-1 , δ k,4s , δ k,4N-2 Represents thermal resistance R k,1 , R k,2 , R k,4s-6 , R k,4s-5 , R k,4s-4 , R k,4s-3 , R k,4s-2 , δ k,4s-1 , δ k,4s , R k,4N-2 The state value parameter, C p,clt is the specific heat capacity of the working fluid at constant pressure, is the coolant mass flow rate in the circuit.

[0023] Furthermore, the state value parameter is 0 or 1. When the state value parameter is 0, the thermal resistance value corresponding to the state value parameter is an infinite value; when the state value parameter is 1, the thermal resistance value corresponding to the state value parameter is the actual resistance value of the thermal resistor.

[0024] Furthermore, the movement direction of the working fluid of the first heat source basic unit, the thermal resistance of the driving component, the driving component and the first heat dissipation or heat storage basic unit is:

[0025] After passing through the driving component, the working fluid passes through the first heat source basic unit, the first heat dissipation or heat storage basic unit and the driving component thermal resistance in sequence, and then enters the driving component again.

[0026] Furthermore, the calculation process of the component temperature is specifically as follows:

[0027] Temperature changes of each heat source component, heat dissipation or heat storage component and driving component over time Calculation is performed based on the law of conservation of energy, and the temperature of the component is obtained based on the change of temperature over time. The formula is uniformly expressed as:

[0028]

[0029] Among them, C comp is the heat capacity of the heat source component, heat dissipation or heat storage component, and driving component, T comp is the working fluid temperature at the outlet of the heat source component, heat dissipation or heat storage component, and drive component, T i is the outlet working fluid temperature of the i-th upstream component adjacent to the heat source component, heat dissipation or heat storage component, and drive component, C comp 、T comp With T i The formula describes the same component. If the target component has multiple upstream components, calculate each upstream component. And sum it up. For the n-1th heat source component, its upstream component is the nth heat source component or driving component. For the Mth heat source component, its upstream component is the driving component. For the first heat dissipation or heat storage component, its upstream component is the first heat source component and all other heat source components connected in parallel with the first heat source component. At this time, T i Take the temperature of the working fluid of the first heat source component and all other heat source components connected in parallel with the first heat source component after mixing at the component outlet. For the sth heat dissipation or heat storage component, its upstream component is the s-1th heat dissipation or heat storage component or the first heat source component and all other heat source components connected in parallel with the first heat source component. At this time, T i Take the working fluid temperature at the outlet of the s-1th heat dissipation or heat storage component or the temperature of the working fluid of the first heat source component and all other heat source components connected in parallel with the first heat source component after mixing at the component outlet. For the driving component, its upstream components are the 1st to Nth heat dissipation or heat storage components, R i It is the sum of all thermal resistances between the heat source component, the heat dissipation or heat storage component, the driving component and its adjacent upstream component, T i With R i Corresponding to the same upstream component, q comp is the amount of heat generated by the heat source component, the heat dissipation or storage component, and the driving component, and i represents the i-th upstream component.

[0030] Another aspect of the present invention provides a vehicle thermal management method based on a multi-strategy universal loop, the method comprising the following steps:

[0031] S1. Constructing an initial vehicle circuit, the initial vehicle circuit including a driving component thermal resistance, a driving component, a heat dissipation or heat storage component thermal resistance, a first heat dissipation or heat storage component, a heat source component thermal resistance, and a first heat source component connected in series in sequence, the heat source component thermal resistance and the first heat source component forming a first heat source basic unit, and the heat dissipation or heat storage component thermal resistance and the first heat dissipation or heat storage component forming a first heat dissipation or heat storage basic unit;

[0032] The inlet of the heat source basic unit is connected to one end of the thermal resistor of the heat source component, the other end of the thermal resistor of the heat source component is connected to one end of the heat source component, and the other end of the heat source component is connected to the outlet of the heat source basic unit;

[0033] The inlet of the heat dissipation or heat storage basic unit is connected to one end of the thermal resistor of the heat dissipation or heat storage component, the other end of the thermal resistor of the heat dissipation or heat storage component is connected to one end of the heat dissipation or heat storage component, the other end of the heat dissipation or heat storage component is connected to the outlet of the heat dissipation or heat storage basic unit, the inlet of the heat dissipation or heat storage basic unit is connected to one end of the driving component, the other end of the driving component is connected to one end of the thermal resistor of the driving component, the other end of the thermal resistor of the driving component is connected to the outlet of the heat source basic unit, and the outlet of the heat dissipation or heat storage basic unit is connected to the inlet of the heat source basic unit;

[0034] S2. Using the initial vehicle loop as the current vehicle loop;

[0035] S3. Let M be the total number of heat source basic units in the vehicle thermal management system, n-1 be the total number of heat source basic units in the current vehicle circuit, and n and M be integers ≥ 2;

[0036] If n-1 is less than M, the heat source basic unit of the current vehicle circuit is expanded, and the nth heat source basic unit is connected between one end of the n-1th heat source basic unit of the current vehicle circuit and one end of the first heat dissipation or heat storage component for series expansion, or the inlet and outlet of the nth heat source basic unit are connected to the inlet and outlet of the n-1th heat source basic unit of the current vehicle circuit for parallel expansion, n is updated to n+1, and S3 is repeated;

[0037] Otherwise, execute S4;

[0038] S4. Let N be the total number of heat dissipation or heat storage basic units of the vehicle thermal management system, s-1 be the total number of heat dissipation or heat storage basic units of the current vehicle circuit, and s and N be integers ≥ 2;

[0039] If s-1 is less than N, the heat dissipation or heat storage basic unit of the current vehicle circuit is expanded, and the sth heat dissipation or heat storage basic unit is connected between the inlet of the Mth heat source basic unit and one end of the s-1th heat dissipation or heat storage basic unit, and the first thermal resistance of the sth heat dissipation or heat storage basic unit is set between the outlet of the s-1th heat dissipation or heat storage basic unit and the inlet of the sth heat dissipation or heat storage basic unit; the first thermal resistance of the sth heat dissipation or heat storage basic unit is set between the inlet of the s-1th heat dissipation or heat storage basic unit and the inlet of the sth heat dissipation or heat storage basic unit. The second thermal resistance of the sth heat dissipation or heat storage basic unit; the third thermal resistance of the sth heat dissipation or heat storage basic unit is set between the outlet of the sth heat dissipation or heat storage basic unit and the inlet of the Mth heat source basic unit. At this time, the thermal resistance between the outlet of the first heat dissipation or heat storage basic unit and the inlet of the Mth heat source basic unit is the third thermal resistance of the first heat dissipation or heat storage basic unit, and the thermal resistance of the heat source component of the Mth heat source basic unit exists in the form of the third thermal resistance of each heat dissipation or heat storage basic unit; update s to s+1, and repeat S4;

[0040] Otherwise, execute S5;

[0041] S5. The current vehicle circuit is used as the vehicle thermal management system. The vehicle thermal management system has M heat source basic units and N heat dissipation or heat storage basic units. All thermal resistances in the vehicle thermal management system are numbered. The thermal resistance of the heat source component in the first heat source basic unit is numbered R. j,1 The thermal resistance of the heat source component in the nth (n=2,3…,M-1) heat source basic unit is numbered as R j,n; Wherein, j indicates that the category of the thermal resistance is the thermal resistance before the heat source component in the heat source basic unit, and each thermal resistance corresponds to a state value parameter;

[0042] The thermal resistance of the first heat dissipation or heat storage unit and the third thermal resistance are numbered R k,1 and R k,2 The first thermal resistance of the sth (s=2,3…,N) heat dissipation or heat storage basic unit is R k,4s-5 The second thermal resistance of the sth (s=2,3…,N) heat dissipation or heat storage basic unit is R k,4s-4 The thermal resistance of the heat dissipation or heat storage component of the sth (s=2,3…,N) heat dissipation or heat storage basic unit is R k,4s-3 The third thermal resistance of the sth (s=2,3…,N-1) heat dissipation or heat storage basic unit is R k,4s-2 , the third thermal resistance of the Nth heat dissipation or heat storage basic unit is R k,4N-2 , k indicates that the thermal resistance category is the thermal resistance before the heat dissipation or heat storage component in the heat dissipation or heat storage component basic unit or the first thermal resistance, second thermal resistance and third thermal resistance of the heat dissipation or heat storage component, and each thermal resistance corresponds to a state value parameter;

[0043] S6. The state value decision database obtains current key indicator parameters of the vehicle thermal management system and determines an operating strategy corresponding to the current key indicator parameters, where each operating strategy corresponds to a set of determined state value parameters of all thermal resistances;

[0044] The vehicle thermal management system determines the resistance values ​​of all thermal resistors based on the state value parameters, determines the current flow path of the working fluid in the vehicle thermal management system based on the resistance values ​​of all thermal resistors, obtains the current key indicator parameters and component temperatures under the current flow path, and returns to S6.

[0045] Furthermore, the resistance of all thermal resistors is:

[0046]

[0047] Among them, R ini It represents the thermal resistance of the heat source component, heat dissipation or heat storage component and the thermal resistance of the driving component in the initial vehicle circuit. The thermal resistance of the heat source component, heat dissipation or heat storage component and the thermal resistance of the driving component in the initial vehicle circuit are equal and are all R ini , δ j,1 Indicates thermal resistance R j,1 The state value parameter, δ j,n Indicates thermal resistance R j,n The state value parameter, δ k,1 , δ k,2 , δ k,4s-6 , δ k,4s-5 , δ k,4s-4 , δk,4s-3 , δ k,4s-2 , δ k,4s-1 , δ k,4s , δ k,4N-2 Represents thermal resistance R k,1 , R k,2 , R k,4s-6 , R k,4s-5 , R k,4s-4 , R k,4s-3 , R k,4s-2 , δ k,4s-1 , δ k,4s , R k,4N-2 The state value parameter, C p,clt is the specific heat capacity of the working fluid at constant pressure, is the coolant mass flow rate in the circuit.

[0048] Furthermore, the state value parameter is 0 or 1. When the state value parameter is 0, the thermal resistance value corresponding to the state value parameter is an infinite value; when the state value parameter is 1, the thermal resistance value corresponding to the state value parameter is the actual resistance value of the thermal resistor.

[0049] Furthermore, the movement direction of the working fluid of the first heat source basic unit, the thermal resistance of the driving component, the driving component and the first heat dissipation or heat storage basic unit is:

[0050] After passing through the driving component, the working fluid passes through the first heat dissipation or heat storage basic unit, the first heat source basic unit and the driving component thermal resistance in sequence, and then enters the driving component again.

[0051] Furthermore, the calculation process of the component temperature is specifically as follows:

[0052] Temperature changes of each heat source component, heat dissipation or heat storage component and driving component over time The calculation can be performed based on the law of conservation of energy. The temperature of the component can be obtained based on the change of temperature over time. The formula is uniformly expressed as:

[0053]

[0054] Among them, C comp is the heat capacity of the heat source component, heat dissipation or heat storage component, and driving component, T comp is the working fluid temperature at the outlet of the heat source component, heat dissipation or heat storage component, and drive component, T i is the temperature of the i-th upstream component adjacent to the heat source component, heat dissipation or heat storage component, and driving component, C comp 、T comp With T i The formula describes the same component. If the target component has multiple upstream components, calculate each upstream component. And sum it up. For the n-1th heat source component, its upstream component is the nth heat source component or the 1st to Nth heat dissipation or heat storage components. For the Mth heat source component, its upstream component is the 1st to Nth heat dissipation or heat storage components. For the 1st heat dissipation or heat storage component, its upstream component is the driving component. For the sth heat dissipation or heat storage component, its upstream component is the s-1th heat dissipation or heat storage component or the driving component. For the driving component, its upstream component is the 1st heat source component and all other heat source components connected in parallel with 1 heat source component. At this time, T i Take the temperature of the first heat source component and all other heat source components connected in parallel with the first heat source component after mixing at the component outlet, R i It is the sum of all thermal resistances between the heat source component, the heat dissipation or heat storage component, the driving component and its adjacent upstream component, T i With R i Corresponding to the same upstream component, q comp is the amount of heat generated by the heat source component, heat dissipation or heat storage component and driving component, and i represents the i-th upstream component.

[0055] Compared with the prior art, the present invention has the following beneficial effects:

[0056] The present invention establishes a unified thermal management system process applicable to multiple operating strategies, arranges thermal resistance nodes in the thermal management system operating loop according to system components and branch conditions, and by forming the thermal management components and thermal resistance nodes into a unit, and connecting the units in series and parallel, it can be expanded to thermal management systems with different component types, quantities and structures; by controlling the state value and resistance size of the thermal resistance node, the on-off of the branch and the directional flow control of the heat flow in the operating loop are realized, thereby realizing flexible control and switching of multiple strategies of the thermal management system, which helps to solve the inefficiency problem of the thermal management system needing to separately model different thermal management loops under each strategy during the switching process of different operating strategies. BRIEF DESCRIPTION OF THE DRAWINGS

[0057] Figure 1 This is a structural diagram of the vehicle thermal management method based on a multi-strategy universal loop of the present invention, wherein Figure 1 (a) is a schematic diagram of the layout of a thermal management system. Figure 1 (b) is a schematic diagram of another thermal management system arrangement;

[0058] Figure 2 The present invention is Figure 1 (a) An example diagram of component expansion of a vehicle thermal management method based on a multi-strategy general loop;

[0059] Figure 3 The present invention is Figure 1(b) An example diagram of component expansion of a vehicle thermal management method based on a multi-strategy general loop based on the arrangement mode;

[0060] Figure 4 Schematic diagram of the calculation process of the vehicle thermal management method based on the multi-strategy universal loop of the present invention;

[0061] Figure 5 is a structural diagram of an embodiment of a vehicle thermal management method based on a multi-strategy universal loop according to the present invention;

[0062] Figure 6 1 and 2 are temperature curves of important components of a general circuit in an embodiment of the present invention under several typical operating strategies. DETAILED DESCRIPTION

[0063] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. This embodiment is implemented based on the technical solution of the present invention, and provides a detailed implementation method and specific operation process, but the protection scope of the present invention is not limited to the following embodiments.

[0064] The present invention relates to a vehicle thermal management method based on a multi-strategy universal loop. The method establishes a unified thermal management system process applicable to multiple operating strategies, arranges thermal resistance nodes in the thermal management system operating loop according to the system components and branch conditions, and realizes the on-off of the branch and the directional flow control of the heat flow in the operating loop by controlling the state value and resistance value of the thermal resistance node, using a universal thermal management system framework to match multiple operating strategies. The thermal management method includes three parts: a state value decision database, a thermal resistance calculation module, and a heat transfer and temperature calculation module. The state value decision database gives the state values ​​of all thermal resistances in the thermal management system loop according to key indicator parameters; the thermal resistance calculation module calculates the thermal resistance value of each node according to the input state value; and the heat transfer and temperature module calculates the heat transfer and temperature of each component based on the node thermal resistance value. This method establishes a unified thermal management loop framework. By combining thermal management components and thermal resistance nodes into a unit and connecting the units in series and parallel, it can be expanded to thermal management systems with different component types, quantities and structures. By controlling the state value and resistance size of the thermal resistance node, flexible control and switching of multiple strategies of the thermal management system are achieved, which helps to solve the inefficiency of the thermal management system in which different thermal management loops need to be modeled separately under each strategy during the switching process of different operating strategies.

[0065] In order to achieve the purpose of the present invention, the following technical solutions are adopted:

[0066] Construct the initial vehicle circuit, such as Figure 1 As shown in (a), the initial vehicle circuit includes the drive component thermal resistance R ini , driving components, heat source components thermal resistance R ini, the first heat source component, the heat dissipation or heat storage component thermal resistance R ini Together with the first heat dissipation or heat storage component, the thermal resistance of the heat source component and the first heat source component constitute a first heat source basic unit, and the thermal resistance of the heat dissipation or heat storage component and the first heat dissipation or heat storage component constitute a first heat dissipation or heat storage basic unit;

[0067] The inlet of the heat source basic unit is connected to one end of the thermal resistor of the heat source component, the other end of the thermal resistor of the heat source component is connected to one end of the heat source component, and the other end of the heat source component is connected to the outlet of the heat source basic unit;

[0068] The inlet of the heat dissipation or heat storage basic unit is connected to one end of the thermal resistor of the heat dissipation or heat storage component, the other end of the thermal resistor of the heat dissipation or heat storage component is connected to one end of the heat dissipation or heat storage component, the other end of the heat dissipation or heat storage component is connected to the outlet of the heat dissipation or heat storage basic unit, the inlet of the heat dissipation or heat storage basic unit is connected to the outlet of the heat source basic unit, the outlet of the heat dissipation or heat storage basic unit is connected to one end of the thermal resistor of the driving component, the other end of the thermal resistor of the driving component is connected to one end of the driving component, and the other end of the driving component is connected to the inlet of the heat source basic unit; Figure 2 The present invention is Figure 1 (a) An example diagram of component expansion of a vehicle thermal management method based on a multi-strategy universal loop based on the layout method.

[0069] The specific steps for expansion are:

[0070] Let M be the total number of heat source basic units of the vehicle thermal management system, n-1 be the total number of heat source basic units of the current vehicle circuit, and n and M be integers ≥ 2;

[0071] If n-1 is less than M, expand the heat source basic unit of the current vehicle circuit, connect the nth heat source basic unit between one end of the n-1th heat source basic unit of the current vehicle circuit and one end of the driving component for series expansion, or connect the inlet and outlet of the nth heat source basic unit to the inlet and outlet of the n-1th heat source basic unit of the current vehicle circuit for parallel expansion, update n to n+1, and repeat the above steps.

[0072] Otherwise, execute: Let N be the total number of heat dissipation or heat storage basic units of the vehicle thermal management system, s-1 be the total number of heat dissipation or heat storage basic units of the current vehicle circuit, and s and N be integers ≥ 2;

[0073] If s-1 is less than N, the heat dissipation or heat storage basic unit of the current vehicle circuit is expanded, and the sth heat dissipation or heat storage basic unit is connected between the other end of the driving component and one end of the s-1th heat dissipation or heat storage basic unit. The first thermal resistance of the sth heat dissipation or heat storage basic unit is set between the outlet of the s-1th heat dissipation or heat storage basic unit and the inlet of the sth heat dissipation or heat storage basic unit; the second thermal resistance of the sth heat dissipation or heat storage basic unit is set between the inlet of the s-1th heat dissipation or heat storage basic unit and the inlet of the sth heat dissipation or heat storage basic unit; the third thermal resistance of the sth heat dissipation or heat storage basic unit is set between the outlet of the sth heat dissipation or heat storage basic unit and the driving component. At this time, the thermal resistance between the outlet of the first heat dissipation or heat storage basic unit and the driving component is the third thermal resistance of the first heat dissipation or heat storage basic unit, that is, the thermal resistance of the driving component in the initial vehicle circuit. The thermal resistance of the driving component exists in the form of the third thermal resistance of each heat dissipation or heat storage basic unit. s is updated to s+1.

[0074] After the expansion is completed, the current vehicle circuit is used as the vehicle thermal management system. The vehicle thermal management system has a total of M heat source basic units and N heat dissipation or heat storage basic units. All thermal resistances in the vehicle thermal management system are numbered, among which the thermal resistance of the heat source component in the first heat source basic unit is numbered R. j,1 The thermal resistance of the heat source component in the nth (n=2,3…,M) heat source basic unit is numbered as R j,n ; Wherein, j indicates that the category of the thermal resistance is the thermal resistance before the heat source component in the heat source basic unit, and each thermal resistance corresponds to a state value parameter;

[0075] The thermal resistance of the first heat dissipation or heat storage unit and the third thermal resistance are numbered R k,1 and R k,2 The first thermal resistance of the sth (s=2,3…,N) heat dissipation or heat storage basic unit is R k,4s-5 The second thermal resistance of the sth (s=2,3…,N) heat dissipation or heat storage basic unit is R k,4s-4 The thermal resistance of the heat dissipation or heat storage component of the sth (s=2,3…,N) heat dissipation or heat storage basic unit is R k,4s-3 The third thermal resistance of the sth (s=2,3…,N-1) heat dissipation or heat storage basic unit is R k,4s-2 , the third thermal resistance of the Nth heat dissipation or heat storage basic unit is R k,4N-2 , k indicates that the thermal resistance category is the thermal resistance before the heat dissipation or heat storage component in the basic unit of the heat dissipation or heat storage component, or the first thermal resistance, second thermal resistance and third thermal resistance of the heat dissipation or heat storage component, and each thermal resistance corresponds to a state value parameter.

[0076] like Figure 4As shown, the state value decision database obtains the current key indicator parameters of the vehicle thermal management system, determines the operating strategy corresponding to the current key indicator parameters, and each operating strategy corresponds to a set of state value parameters of all thermal resistors. Based on the state value parameters, the resistance values ​​of all thermal resistors are determined. The vehicle thermal management system determines the current flow path of the working fluid in the vehicle thermal management system based on the resistance values ​​of all thermal resistors, obtains the current key indicator parameters and component temperatures under the current flow path, and returns the state value decision database. The resistance values ​​of all thermal resistors are:

[0077] Among them, R ini It represents the thermal resistance of the heat source component, heat dissipation or heat storage component and the thermal resistance of the driving component in the initial vehicle circuit. The thermal resistance of the heat source component, heat dissipation or heat storage component and the thermal resistance of the driving component in the initial vehicle circuit are equal and are all R ini , δ j,1 Indicates thermal resistance R j,1 The state value parameter, δ j,n Indicates thermal resistance R j,n The state value parameter, δ k,1 , δ k,2 , δ k,4s-6 , δ k,4s-5 , δ k,4s-4 , δ k,4s-3 , δ k,4s-2 , δ k,4s-1 , δ k,4s , δ k,4N-2 Represents thermal resistance R k,1 , R k,2 , R k,4s-6 , R k,4s-5 , R k,4s-4 , R k,4s-3 , R k,4s-2 , δ k,4s-1 , δ k,4s , R k,4N-2 The state value parameter, C p,clt is the specific heat capacity of the working fluid at constant pressure, is the coolant mass flow rate in the circuit.

[0078] Furthermore, the state value parameter is 0 or 1. When the state value parameter is 0, the thermal resistance value corresponding to the state value parameter is an infinite value; when the state value parameter is 1, the thermal resistance value corresponding to the state value parameter is the actual resistance value of the thermal resistor.

[0079] Furthermore, the movement direction of the working fluid of the first heat source basic unit, the thermal resistance of the driving component, the driving component and the first heat dissipation or heat storage basic unit is:

[0080] After passing through the driving component, the working fluid passes through the first heat source basic unit, the first heat dissipation or heat storage basic unit and the driving component thermal resistance in sequence, and then enters the driving component again.

[0081] Furthermore, the calculation process of the component temperature is specifically as follows:

[0082] Temperature changes of each heat source component, heat dissipation or heat storage component and driving component over time Calculation is performed based on the law of conservation of energy, and the temperature of the component is obtained based on the change of temperature over time. The formula is uniformly expressed as:

[0083]

[0084] Among them, C comp is the heat capacity of the heat source component, heat dissipation or heat storage component, and driving component, T comp is the working fluid temperature at the outlet of the heat source component, heat dissipation or heat storage component, and drive component, T i is the outlet working fluid temperature of the i-th upstream component adjacent to the heat source component, heat dissipation or heat storage component, and drive component, C comp 、T comp With T i The formula describes the same component. If the target component has multiple upstream components, calculate each upstream component. And sum it up. For the n-1th heat source component, its upstream component is the nth heat source component or driving component. For the Mth heat source component, its upstream component is the driving component. For the first heat dissipation or heat storage component, its upstream component is the first heat source component and all other heat source components connected in parallel with the first heat source component. At this time, T i Take the temperature of the working fluid of the first heat source component and all other heat source components connected in parallel with the first heat source component after mixing at the component outlet. For the sth heat dissipation or heat storage component, its upstream component is the s-1th heat dissipation or heat storage component or the first heat source component and all other heat source components connected in parallel with the first heat source component. At this time, T i Take the working fluid temperature at the outlet of the s-1th heat dissipation or heat storage component or the temperature of the working fluid of the first heat source component and all other heat source components connected in parallel with the first heat source component after mixing at the component outlet. For the driving component, its upstream components are the 1st to Nth heat dissipation or heat storage components, R i It is the sum of all thermal resistances between the heat source component, the heat dissipation or heat storage component, the driving component and its adjacent upstream component, T i With R i Corresponding to the same upstream component, q comp is the amount of heat generated by the heat source component, the heat dissipation or storage component, and the driving component, and i represents the i-th upstream component.

[0085] As a further implementation method, the initial vehicle circuit can also be arranged according to the actual operation of the thermal management system as follows Figure 1 (b) The initial vehicle circuit includes the drive components thermal resistance R in series ini , thermal resistance R of driving components, heat dissipation or heat storage components ini , the first heat dissipation or heat storage component, the thermal resistance R of the heat source component ini and the first heat source component, the thermal resistance of the heat source component and the first heat source component constitute a first heat source basic unit, and the thermal resistance of the heat dissipation or heat storage component and the first heat dissipation or heat storage component constitute a first heat dissipation or heat storage basic unit;

[0086] The inlet of the heat source basic unit is connected to one end of the thermal resistor of the heat source component, the other end of the thermal resistor of the heat source component is connected to one end of the heat source component, and the other end of the heat source component is connected to the outlet of the heat source basic unit;

[0087] The inlet of the heat dissipation or heat storage basic unit is connected to one end of the thermal resistor of the heat dissipation or heat storage component, the other end of the thermal resistor of the heat dissipation or heat storage component is connected to one end of the heat dissipation or heat storage component, the other end of the heat dissipation or heat storage component is connected to the outlet of the heat dissipation or heat storage basic unit, the inlet of the heat dissipation or heat storage basic unit is connected to one end of the driving component, the other end of the driving component is connected to one end of the thermal resistor of the driving component, the other end of the thermal resistor of the driving component is connected to the outlet of the heat source basic unit, and the outlet of the heat dissipation or heat storage basic unit is connected to the inlet of the heat source basic unit; Figure 3 The present invention is Figure 1 (b) An example diagram of component expansion of a vehicle thermal management method based on a multi-strategy universal loop based on the layout method.

[0088] The specific steps for expansion are:

[0089] Let M be the total number of heat source basic units of the vehicle thermal management system, n-1 be the total number of heat source basic units of the current vehicle circuit, and n and M be integers ≥ 2;

[0090] If n-1 is less than M, the heat source basic unit of the current vehicle circuit is expanded, and the nth heat source basic unit is connected between one end of the n-1th heat source basic unit of the current vehicle circuit and one end of the first heat dissipation or heat storage component for series expansion, or the inlet and outlet of the nth heat source basic unit are respectively connected to the inlet and outlet of the n-1th heat source basic unit of the current vehicle circuit for parallel expansion, and n is updated to n+1.

[0091] Otherwise, execute: Let N be the total number of heat dissipation or heat storage basic units of the vehicle thermal management system, s-1 be the total number of heat dissipation or heat storage basic units of the current vehicle circuit, and s and N be integers ≥ 2;

[0092] If s-1 is less than N, the heat dissipation or heat storage basic unit of the current vehicle circuit is expanded, and the sth heat dissipation or heat storage basic unit is connected between the inlet of the Mth heat source basic unit and one end of the s-1th heat dissipation or heat storage basic unit, and the first thermal resistance of the sth heat dissipation or heat storage basic unit is set between the outlet of the s-1th heat dissipation or heat storage basic unit and the inlet of the sth heat dissipation or heat storage basic unit; the first thermal resistance of the sth heat dissipation or heat storage basic unit is set between the inlet of the s-1th heat dissipation or heat storage basic unit and the inlet of the sth heat dissipation or heat storage basic unit. Set the second thermal resistance of the s-th heat dissipation or heat storage basic unit; set the third thermal resistance of the s-th heat dissipation or heat storage basic unit between the outlet of the s-th heat dissipation or heat storage basic unit and the inlet of the M-th heat source basic unit. At this time, the thermal resistance between the outlet of the 1st heat dissipation or heat storage basic unit and the inlet of the M-th heat source basic unit is the third thermal resistance of the 1st heat dissipation or heat storage basic unit, and the thermal resistance of the heat source component of the M-th heat source basic unit exists in the form of the third thermal resistance of each heat dissipation or heat storage basic unit; update s to s+1.

[0093] After the expansion is completed, the current vehicle circuit is used as the vehicle thermal management system. The vehicle thermal management system has a total of M heat source basic units and N heat dissipation or heat storage basic units. All thermal resistances in the vehicle thermal management system are numbered, among which the thermal resistance of the heat source component in the first heat source basic unit is numbered R. j,1 The thermal resistance of the heat source component in the nth (n=2,3…,M-1) heat source basic unit is numbered as R j,n ; Wherein, j indicates that the category of the thermal resistance is the thermal resistance before the heat source component in the heat source basic unit, and each thermal resistance corresponds to a state value parameter;

[0094] The thermal resistance of the first heat dissipation or heat storage unit and the third thermal resistance are numbered R k,1 and R k,2 The first thermal resistance of the sth (s=2,3…,N) heat dissipation or heat storage basic unit is R k,4s-5 The second thermal resistance of the sth (s=2,3…,N) heat dissipation or heat storage basic unit is R k,4s-4 The thermal resistance of the heat dissipation or heat storage component of the sth (s=2,3…,N) heat dissipation or heat storage basic unit is R k,4s-3 The third thermal resistance of the sth (s=2,3…,N-1) heat dissipation or heat storage basic unit is R k,4s-2 , the third thermal resistance of the Nth heat dissipation or heat storage basic unit is R k,4N-2 , k indicates that the thermal resistance category is the thermal resistance before the heat dissipation or heat storage component in the basic unit of the heat dissipation or heat storage component, or the first thermal resistance, second thermal resistance and third thermal resistance of the heat dissipation or heat storage component, and each thermal resistance corresponds to a state value parameter.

[0095] like Figure 4As shown, the state value decision database obtains the current key indicator parameters of the vehicle thermal management system, determines the operating strategy corresponding to the current key indicator parameters, and each operating strategy corresponds to a set of determined state value parameters of all thermal resistors; based on the state value parameters, the resistance values ​​of all thermal resistors are determined, and the vehicle thermal management system determines the current flow path of the working fluid in the vehicle thermal management system based on the resistance values ​​of all thermal resistors, obtains the current key indicator parameters and the temperature of the components under the current flow path, and returns the state value decision database.

[0096] The resistance values ​​of all thermal resistors are:

[0097]

[0098] Among them, R ini It represents the thermal resistance of the heat source component, heat dissipation or heat storage component and the thermal resistance of the driving component in the initial vehicle circuit. The thermal resistance of the heat source component, heat dissipation or heat storage component and the thermal resistance of the driving component in the initial vehicle circuit are equal and are all R ini , δ j,1 Indicates thermal resistance R j,1 The state value parameter, δ j,n Indicates thermal resistance R j,n The state value parameter, δ k,1 , δ k,2 , δ k,4s-6 , δ k,4s-5 , δ k,4s-4 , δ k,4s-3 , δ k,4s-2 , δ k,4s-1 , δ k,4s , δ k,4N-2 Represents thermal resistance R k,1 , R k,2 , R k,4s-6 , R k,4s-5 , R k,4s-4 , R k,4s-3 , R k,4s-2 , δ k,4s-1 , δ k,4s , R k,4N-2 The state value parameter, C p,clt is the specific heat capacity of the working fluid at constant pressure, is the mass flow rate of the coolant in the circuit. Furthermore, the state value parameter is 0 or 1. When the state value parameter is 0, the thermal resistance value corresponding to the state value parameter is infinite; when the state value parameter is 1, the thermal resistance value corresponding to the state value parameter is the actual resistance value of the thermal resistor.

[0099] Furthermore, the movement direction of the working fluid of the first heat source basic unit, the thermal resistance of the driving component, the driving component and the first heat dissipation or heat storage basic unit is:

[0100] After passing through the driving component, the working fluid passes through the first heat dissipation or heat storage basic unit, the first heat source basic unit and the driving component thermal resistance in sequence, and then enters the driving component again.

[0101] Furthermore, the calculation process of the component temperature is specifically as follows:

[0102] Temperature changes of each heat source component, heat dissipation or heat storage component and driving component over time The calculation can be performed based on the law of conservation of energy. The temperature of the component can be obtained based on the change of temperature over time. The formula is uniformly expressed as:

[0103]

[0104] Among them, C comp is the heat capacity of the heat source component, heat dissipation or heat storage component, and driving component, T comp is the working fluid temperature at the outlet of the heat source component, heat dissipation or heat storage component, and drive component, T i is the temperature of the i-th upstream component adjacent to the heat source component, heat dissipation or heat storage component, and driving component, C comp 、T comp With T i The formula describes the same component. If the target component has multiple upstream components, calculate each upstream component. And sum it up. For the n-1th heat source component, its upstream component is the nth heat source component or the 1st to Nth heat dissipation or heat storage components. For the Mth heat source component, its upstream component is the 1st to Nth heat dissipation or heat storage components. For the 1st heat dissipation or heat storage component, its upstream component is the driving component. For the sth heat dissipation or heat storage component, its upstream component is the s-1th heat dissipation or heat storage component or the driving component. For the driving component, its upstream component is the 1st heat source component and all other heat source components connected in parallel with 1 heat source component. At this time, T i Take the temperature of the first heat source component and all other heat source components connected in parallel with the first heat source component after mixing at the component outlet, R i It is the sum of all thermal resistances between the heat source component, the heat dissipation or heat storage component, the driving component and its adjacent upstream component, T i With R i Corresponding to the same upstream component, q comp is the amount of heat generated by the heat source component, heat dissipation or heat storage component and driving component, and i represents the i-th upstream component.

[0105] This paper establishes a system loop applicable to various operating strategies. It derives an energy conservation equation that matches the loop and is used to calculate heat transfer and temperature rise. Furthermore, this universal loop is scalable, accommodating the addition of new components in series or parallel. By using different state value parameters, the universal loop can flexibly and conveniently simulate different operating strategies of the thermal management system within the same model, including small-cycle preheating, operation of a single heat dissipation or storage component, operation of multiple heat dissipation or storage components in series, and operation of multiple heat dissipation or storage components in parallel.

[0106] A typical implementation process of the present invention is as follows:

[0107] S1. Construct an initial vehicle circuit, which includes a driving component thermal resistance, a driving component water pump, a heat source component thermal resistance, a first heat source component intercooler, a heat dissipation or heat storage component thermal resistance, and a first heat dissipation or heat storage component water radiator connected in series in sequence. The heat source component thermal resistance and the first heat source component constitute a first heat source basic unit, and the heat dissipation or heat storage component thermal resistance and the first heat dissipation or heat storage component constitute a first heat dissipation or heat storage basic unit.

[0108] The inlet of the heat source basic unit is connected to one end of the thermal resistor of the heat source component, the other end of the thermal resistor of the heat source component is connected to one end of the heat source component, and the other end of the heat source component is connected to the outlet of the heat source basic unit;

[0109] The inlet of the heat dissipation or heat storage basic unit is connected to one end of the thermal resistor of the heat dissipation or heat storage component, the other end of the thermal resistor of the heat dissipation or heat storage component is connected to one end of the heat dissipation or heat storage component, the other end of the heat dissipation or heat storage component is connected to the outlet of the heat dissipation or heat storage basic unit, the inlet of the heat dissipation or heat storage basic unit is connected to the outlet of the heat source basic unit, the outlet of the heat dissipation or heat storage basic unit is connected to one end of the thermal resistor of the driving component, the other end of the thermal resistor of the driving component is connected to one end of the driving component, and the other end of the driving component is connected to the inlet of the heat source basic unit;

[0110] S2. Using the initial vehicle loop as the current vehicle loop;

[0111] S3. The total number of heat source basic units M in the vehicle thermal management system is 2, and the total number of heat source basic units n-1 in the current vehicle circuit is 1. The current vehicle circuit is expanded. The second heat source component is the engine. The second heat source basic unit includes the engine and the engine thermal resistance. The inlet and outlet of the second heat source basic unit are connected to the inlet and outlet of the first heat source basic unit of the current vehicle circuit, respectively, for parallel expansion.

[0112] S4. The total number N of heat dissipation or heat storage basic units of the vehicle thermal management system is 2, and the total number s-1 of heat dissipation or heat storage basic units of the current vehicle circuit is 1. The current vehicle circuit is expanded; the second heat dissipation or heat storage component is a heat storage module. The second heat dissipation or heat storage basic unit includes a heat storage module and a thermal resistance of the heat storage module. The second heat dissipation or heat storage basic unit is connected between the inlet of the driving component and one end of the first heat dissipation or heat storage basic unit, and a second heat dissipation or heat storage basic unit is set between the outlet of the first heat dissipation or heat storage basic unit and the inlet of the second heat dissipation or heat storage basic unit. The first thermal resistance of the element; the second thermal resistance of the second heat dissipation or heat storage basic unit is set between the inlet of the first heat dissipation or heat storage basic unit and the inlet of the second heat dissipation or heat storage basic unit; the third thermal resistance of the second heat dissipation or heat storage basic unit is set between the outlet of the second heat dissipation or heat storage basic unit and the driving component. At this time, the thermal resistance between the outlet of the first heat dissipation or heat storage basic unit and the driving component is the third thermal resistance of the first heat dissipation or heat storage basic unit, that is, the thermal resistance of the driving component in the initial vehicle circuit. The thermal resistance of the driving component exists in the form of the third thermal resistance of each heat dissipation or heat storage basic unit;

[0113] S5. The current vehicle circuit is used as the vehicle thermal management system. The vehicle thermal management system has M = 2 heat source basic units and N = 2 heat dissipation or heat storage basic units. All thermal resistances in the vehicle thermal management system are numbered, where the thermal resistance of the heat source component in the first heat source basic unit is numbered R. j,1 The thermal resistance of the heat source component in the second heat source basic unit is numbered R j,2 ; Wherein, j indicates that the category of the thermal resistance is the thermal resistance before the heat source component in the heat source basic unit, and each thermal resistance corresponds to a state value parameter;

[0114] The thermal resistance of the heat dissipation or heat storage component of the first heat dissipation or heat storage basic unit is R k,1 , the third thermal resistance of the first heat dissipation or heat storage component is R k,2 ,,The first thermal resistance of the second heat dissipation or heat storage component is R k,3 , the second thermal resistance is R k,4 , the thermal resistance of the heat dissipation or heat storage component of the second heat dissipation or heat storage basic unit is R k,5 , the third thermal resistance is R k,6 , k indicates that the thermal resistance category is the thermal resistance before the heat dissipation or heat storage component in the basic unit of the heat dissipation or heat storage component or the first thermal resistance, second thermal resistance and third thermal resistance of the heat dissipation or heat storage component. Each thermal resistance corresponds to a state value parameter, such as Figure 5 As shown;

[0115] S6. The state value decision database obtains current key indicator parameters of the vehicle thermal management system and determines an operating strategy corresponding to the current key indicator parameters, where each operating strategy corresponds to a set of determined state value parameters of all thermal resistances;

[0116] The vehicle thermal management system determines the resistance values ​​of all thermal resistors based on the state value parameters. The vehicle thermal management system determines the current flow path of the working fluid in the vehicle thermal management system based on the resistance values ​​of all thermal resistors, obtains the current key indicator parameters and component temperatures under the current flow path, and returns to S6. The resistance values ​​of all thermal resistors are:

[0117]

[0118] Among them, δ j,1 , δ j,2 Represents thermal resistance R j,1 and R j,2 The state value parameter, δ k,1 , δ k,2 , δ k,3 , δ k,4 , δ k,5 , δ k,6 Represents thermal resistance R k,1 , R k,2 , R k,3 , R k,4 , R k,5 , R k,6 The status value parameter, is the total coolant mass flow rate in the circuit, C p,clt is the constant-pressure specific heat capacity of the coolant, a is the coolant mass flow ratio in the two branches when the water radiator and the heat storage module work in parallel;

[0119] The state value parameter is either 0 or 1. When the state value parameter is 0, the corresponding thermal resistance value is infinite; when the state value parameter is 1, the corresponding thermal resistance value is the actual resistance value of the thermal resistor. The set of state value parameters of all thermal resistors determines the operating strategy of the thermal management system, and each operating strategy corresponds to a set of specific thermal resistor state value parameters. Figure 5 In the general loop shown, the combinations of different operation strategies and state values ​​are shown in Table 1.

[0120] Table 1 Combinations of state values ​​under different operation strategies

[0121]

[0122]

[0123] According to the law of conservation of energy, the temperature calculation equations for the entire general circuit are derived as follows:

[0124]

[0125] Among them, C acl is the heat capacity of the intercooler, C eng is the engine heat capacity, C rad is the heat capacity of the water radiator, C PCM is the heat capacity of the heat storage module, C pum is the heat capacity of the water pump, T acl1 is the coolant temperature at the intercooler outlet, T eng is the engine outlet coolant temperature, T rad is the coolant temperature at the outlet of the water radiator, T PCM is the coolant temperature at the outlet of the heat storage module, T pum is the coolant temperature at the pump outlet, T node_1 is the mixed temperature of the intercooler outlet coolant and the engine outlet coolant, q acl is the heat dissipation of the intercooler, q eng Generates heat for the engine, q rad The heat dissipation of the water radiator. The key indicator parameters here include temperature.

[0126] Figure 6 The temperature simulation results of the important components of the universal circuit in this embodiment under several typical operating strategies are shown. The thermal management system first operates under strategy one for 32 seconds. After the small cycle ends, the high-temperature heat storage module is enabled, and strategy three is entered, and the high-temperature heat storage module begins to store heat. After the system runs for 62 seconds, heat storage is completed, the high-temperature water radiator is enabled, and the thermal management system enters strategy two. The temperature of the heat storage module remains unchanged after this. The heat generation and heat dissipation of the circuit gradually reach a balance in mode two, and the temperature of each component eventually stabilizes. In the same calculation model, accurate calculation of different operating strategies is achieved by relying on changes in state parameters.

[0127] The above describes in detail the preferred embodiments of the present invention. It should be understood that those skilled in the art can make numerous modifications and variations based on the concepts of the present invention without inventive effort. Therefore, any technical solutions that can be derived by those skilled in the art through logical analysis, reasoning, or limited experimentation based on the concepts of the present invention and the prior art should be within the scope of protection defined by the claims.

Claims

1. A vehicle thermal management method based on a multi-strategy universal loop, characterized in that: The method comprises the following steps: S1. Constructing an initial vehicle circuit, wherein the initial vehicle circuit includes a driving component thermal resistance, a driving component, a heat source component thermal resistance, a first heat source component, a heat dissipation or heat storage component thermal resistance, and a first heat dissipation or heat storage component connected in series in sequence, wherein the heat source component thermal resistance and the first heat source component constitute a first heat source basic unit, and the heat dissipation or heat storage component thermal resistance and the first heat dissipation or heat storage component constitute a first heat dissipation or heat storage basic unit; The inlet of the heat source basic unit is connected to one end of the thermal resistor of the heat source component, the other end of the thermal resistor of the heat source component is connected to one end of the heat source component, and the other end of the heat source component is connected to the outlet of the heat source basic unit; The inlet of the heat dissipation or heat storage basic unit is connected to one end of the thermal resistor of the heat dissipation or heat storage component, the other end of the thermal resistor of the heat dissipation or heat storage component is connected to one end of the heat dissipation or heat storage component, the other end of the heat dissipation or heat storage component is connected to the outlet of the heat dissipation or heat storage basic unit, the inlet of the heat dissipation or heat storage basic unit is connected to the outlet of the heat source basic unit, the outlet of the heat dissipation or heat storage basic unit is connected to one end of the thermal resistor of the driving component, the other end of the thermal resistor of the driving component is connected to one end of the driving component, and the other end of the driving component is connected to the inlet of the heat source basic unit; S2. Using the initial vehicle loop as the current vehicle loop; S3. Let M be the total number of heat source basic units in the vehicle thermal management system, n-1 be the total number of heat source basic units in the current vehicle circuit, and n and M be integers ≥ 2; If n-1 is less than M, the heat source basic unit of the current vehicle circuit is expanded, and the nth heat source basic unit is connected between one end of the n-1th heat source basic unit of the current vehicle circuit and one end of the driving component for series expansion, or the inlet and outlet of the nth heat source basic unit are connected to the inlet and outlet of the n-1th heat source basic unit of the current vehicle circuit for parallel expansion, n is updated to n+1, and S3 is repeated; Otherwise, execute S4; S4. Let N be the total number of heat dissipation or heat storage basic units of the vehicle thermal management system, s-1 be the total number of heat dissipation or heat storage basic units of the current vehicle circuit, and s and N be integers ≥ 2; If s-1 is less than N, the heat dissipation or heat storage basic unit of the current vehicle circuit is expanded, and the sth heat dissipation or heat storage basic unit is connected between the other end of the driving component and one end of the s-1th heat dissipation or heat storage basic unit. The first thermal resistance of the sth heat dissipation or heat storage basic unit is set between the outlet of the s-1th heat dissipation or heat storage basic unit and the inlet of the sth heat dissipation or heat storage basic unit; the second thermal resistance of the sth heat dissipation or heat storage basic unit is set between the inlet of the s-1th heat dissipation or heat storage basic unit and the inlet of the sth heat dissipation or heat storage basic unit; the third thermal resistance of the sth heat dissipation or heat storage basic unit is set between the outlet of the sth heat dissipation or heat storage basic unit and the driving component. At this time, the thermal resistance between the outlet of the first heat dissipation or heat storage basic unit and the driving component is the third thermal resistance of the first heat dissipation or heat storage basic unit, that is, the thermal resistance of the driving component in the initial vehicle circuit. The thermal resistance of the driving component exists in the form of the third thermal resistance of each heat dissipation or heat storage basic unit. s is updated to s+1, and S4 is repeated. Otherwise, execute S5; S5. The current vehicle circuit is used as the vehicle thermal management system. The vehicle thermal management system has M heat source basic units and N heat dissipation or heat storage basic units. All thermal resistances in the vehicle thermal management system are numbered. The thermal resistance of the heat source component in the first heat source basic unit is numbered R. j,1 The thermal resistance of the heat source component in the nth (n=2,3…,M) heat source basic unit is numbered as R j,n ; Wherein, j indicates that the category of the thermal resistance is the thermal resistance before the heat source component in the heat source basic unit, and each thermal resistance corresponds to a state value parameter; The thermal resistance of the first heat dissipation or heat storage unit and the third thermal resistance are numbered R k,1 and R k,2 The first thermal resistance of the sth (s=2,3…,N) heat dissipation or heat storage basic unit is R k,4s-5 The second thermal resistance of the sth (s=2,3…,N) heat dissipation or heat storage basic unit is R k,4s-4 The thermal resistance of the heat dissipation or heat storage component of the sth (s=2,3…,N) heat dissipation or heat storage basic unit is R k,4s-3 The third thermal resistance of the sth (s=2,3…,N-1) heat dissipation or heat storage basic unit is R k,4s-2 , the third thermal resistance of the Nth heat dissipation or heat storage basic unit is R k,4N-2 , k indicates that the thermal resistance category is the thermal resistance before the heat dissipation or heat storage component in the heat dissipation or heat storage component basic unit or the first thermal resistance, second thermal resistance and third thermal resistance of the heat dissipation or heat storage component, and each thermal resistance corresponds to a state value parameter; S6. The state value decision database obtains current key indicator parameters of the vehicle thermal management system and determines an operating strategy corresponding to the current key indicator parameters, where each operating strategy corresponds to a set of determined state value parameters of all thermal resistances; The vehicle thermal management system determines the resistance values ​​of all thermal resistors based on the state value parameters, determines the current flow path of the working fluid in the vehicle thermal management system based on the resistance values ​​of all thermal resistors, obtains the current key indicator parameters and component temperatures under the current flow path, and returns to S6.

2. The vehicle thermal management method based on a multi-strategy universal loop according to claim 1, characterized in that: The resistance values ​​of all thermal resistors are: Among them, R ini It represents the thermal resistance of the heat source component, heat dissipation or heat storage component and the thermal resistance of the driving component in the initial vehicle circuit. The thermal resistance of the heat source component, heat dissipation or heat storage component and the thermal resistance of the driving component in the initial vehicle circuit are equal and are all R ini , δ j,1 Indicates thermal resistance R j,1 The state value parameter, δ j,n Indicates thermal resistance R j,n The state value parameter, δ k,1 , δ k,2 , δ k,4s-6 , δ k,4s-5 , δ k,4s-4 , δ k,4s-3 , δ k,4s-2 , δ k,4s-1 , δ k,4s , δ k,4N-2 Represents thermal resistance R k,1 , R k,2 , R k,4s-6 , R k,4s-5 , R k,4s-4 , R k,4s-3 , R k,4s-2 , δ k,4s-1 , δ k,4s , R k,4N-2 The state value parameter, C p,clt is the specific heat capacity of the working fluid at constant pressure, is the coolant mass flow rate in the circuit.

3. The vehicle thermal management method based on a multi-strategy universal loop according to claim 2, characterized in that: The state value parameter is 0 or 1. When the state value parameter is 0, the thermal resistance value corresponding to the state value parameter is infinite; when the state value parameter is 1, the thermal resistance value corresponding to the state value parameter is the actual resistance value of the thermal resistor.

4. The vehicle thermal management method based on a multi-strategy universal loop according to claim 1, characterized in that: The movement direction of the working fluid of the first heat source basic unit, the thermal resistance of the driving component, the driving component and the first heat dissipation or heat storage basic unit is: After passing through the driving component, the working fluid passes through the first heat source basic unit, the first heat dissipation or heat storage basic unit and the driving component thermal resistance in sequence, and then enters the driving component again.

5. The vehicle thermal management method based on a multi-strategy universal loop according to claim 1, characterized in that: In S6, the calculation process of the component temperature is as follows: Temperature changes of each heat source component, heat dissipation or heat storage component and driving component over time Calculation is performed based on the law of conservation of energy, and the temperature of the component is obtained based on the change of temperature over time. The formula is uniformly expressed as: Among them, C comp is the heat capacity of the heat source component, heat dissipation or heat storage component, and driving component, T comp is the working fluid temperature at the outlet of the heat source component, heat dissipation or heat storage component, and drive component, T i is the outlet working fluid temperature of the i-th upstream component adjacent to the heat source component, heat dissipation or heat storage component, and drive component, C comp 、T comp With T i The formula describes the same component. If the target component has multiple upstream components, calculate each upstream component. And sum it up. For the n-1th heat source component, its upstream component is the nth heat source component or driving component. For the Mth heat source component, its upstream component is the driving component. For the first heat dissipation or heat storage component, its upstream component is the first heat source component and all other heat source components connected in parallel with the first heat source component. At this time, T i Take the temperature of the working fluid of the first heat source component and all other heat source components connected in parallel with the first heat source component after mixing at the component outlet. For the sth heat dissipation or heat storage component, its upstream component is the s-1th heat dissipation or heat storage component or the first heat source component and all other heat source components connected in parallel with the first heat source component. At this time, T i Take the working fluid temperature at the outlet of the s-1th heat dissipation or heat storage component or the temperature after the working fluid of the first heat source component and all other heat source components connected in parallel with the first heat source component are mixed at the component outlet. For the driving component, its upstream components are the 1st to Nth heat dissipation or heat storage components, R i It is the sum of all thermal resistances between the heat source component, the heat dissipation or heat storage component, the driving component and its adjacent upstream component, T i With R i Corresponding to the same upstream component, q comp is the amount of heat generated by the heat source component, the heat dissipation or storage component, and the driving component, and i represents the i-th upstream component.

6. A vehicle thermal management method based on a multi-strategy universal loop, characterized in that: The method comprises the following steps: S1. Constructing an initial vehicle circuit, wherein the initial vehicle circuit includes a driving component thermal resistance, a driving component, a heat dissipation or heat storage component thermal resistance, a first heat dissipation or heat storage component, a heat source component thermal resistance, and a first heat source component connected in series in sequence, wherein the heat source component thermal resistance and the first heat source component constitute a first heat source basic unit, and the heat dissipation or heat storage component thermal resistance and the first heat dissipation or heat storage component constitute a first heat dissipation or heat storage basic unit; The inlet of the heat source basic unit is connected to one end of the thermal resistor of the heat source component, the other end of the thermal resistor of the heat source component is connected to one end of the heat source component, and the other end of the heat source component is connected to the outlet of the heat source basic unit; The inlet of the heat dissipation or heat storage basic unit is connected to one end of the thermal resistor of the heat dissipation or heat storage component, the other end of the thermal resistor of the heat dissipation or heat storage component is connected to one end of the heat dissipation or heat storage component, the other end of the heat dissipation or heat storage component is connected to the outlet of the heat dissipation or heat storage basic unit, the inlet of the heat dissipation or heat storage basic unit is connected to one end of the driving component, the other end of the driving component is connected to one end of the thermal resistor of the driving component, the other end of the thermal resistor of the driving component is connected to the outlet of the heat source basic unit, and the outlet of the heat dissipation or heat storage basic unit is connected to the inlet of the heat source basic unit; S2. Using the initial vehicle loop as the current vehicle loop; S3. Let M be the total number of heat source basic units in the vehicle thermal management system, n-1 be the total number of heat source basic units in the current vehicle circuit, and n and M be integers ≥ 2; If n-1 is less than M, the heat source basic unit of the current vehicle circuit is expanded, and the nth heat source basic unit is connected between one end of the n-1th heat source basic unit of the current vehicle circuit and one end of the first heat dissipation or heat storage component for series expansion, or the inlet and outlet of the nth heat source basic unit are connected to the inlet and outlet of the n-1th heat source basic unit of the current vehicle circuit for parallel expansion, n is updated to n+1, and S3 is repeated; Otherwise, execute S4; S4. Let N be the total number of heat dissipation or heat storage basic units of the vehicle thermal management system, s-1 be the total number of heat dissipation or heat storage basic units of the current vehicle circuit, and s and N be integers ≥ 2; If s-1 is less than N, the heat dissipation or heat storage basic unit of the current vehicle circuit is expanded, and the sth heat dissipation or heat storage basic unit is connected between the inlet of the Mth heat source basic unit and one end of the s-1th heat dissipation or heat storage basic unit, and the first thermal resistance of the sth heat dissipation or heat storage basic unit is set between the outlet of the s-1th heat dissipation or heat storage basic unit and the inlet of the sth heat dissipation or heat storage basic unit; the first thermal resistance of the sth heat dissipation or heat storage basic unit is set between the inlet of the s-1th heat dissipation or heat storage basic unit and the inlet of the sth heat dissipation or heat storage basic unit. The second thermal resistance of the sth heat dissipation or heat storage basic unit; the third thermal resistance of the sth heat dissipation or heat storage basic unit is set between the outlet of the sth heat dissipation or heat storage basic unit and the inlet of the Mth heat source basic unit. At this time, the thermal resistance between the outlet of the first heat dissipation or heat storage basic unit and the inlet of the Mth heat source basic unit is the third thermal resistance of the first heat dissipation or heat storage basic unit, and the thermal resistance of the heat source component of the Mth heat source basic unit exists in the form of the third thermal resistance of each heat dissipation or heat storage basic unit; update s to s+1, and repeat S4; Otherwise, execute S5; S5. The current vehicle circuit is used as the vehicle thermal management system. The vehicle thermal management system has M heat source basic units and N heat dissipation or heat storage basic units. All thermal resistances in the vehicle thermal management system are numbered. The thermal resistance of the heat source component in the first heat source basic unit is numbered R. j,1 The thermal resistance of the heat source component in the nth (n=2,3…,M-1) heat source basic unit is numbered as R j,n ; Wherein, j indicates that the category of the thermal resistance is the thermal resistance before the heat source component in the heat source basic unit, and each thermal resistance corresponds to a state value parameter; The thermal resistance of the first heat dissipation or heat storage unit and the third thermal resistance are numbered R k,1 and R k,2 The first thermal resistance of the sth (s=2,3…,N) heat dissipation or heat storage basic unit is R k,4s-5 The second thermal resistance of the sth (s=2,3…,N) heat dissipation or heat storage basic unit is R k,4s-4 The thermal resistance of the heat dissipation or heat storage component of the sth (s=2,3…,N) heat dissipation or heat storage basic unit is R k,4s-3 The third thermal resistance of the sth (s=2,3…,N-1) heat dissipation or heat storage basic unit is R k,4s-2 , the third thermal resistance of the Nth heat dissipation or heat storage basic unit is R k,4N-2 , k indicates that the thermal resistance category is the thermal resistance before the heat dissipation or heat storage component in the heat dissipation or heat storage component basic unit or the first thermal resistance, second thermal resistance and third thermal resistance of the heat dissipation or heat storage component, and each thermal resistance corresponds to a state value parameter; S6. The state value decision database obtains current key indicator parameters of the vehicle thermal management system and determines an operating strategy corresponding to the current key indicator parameters, where each operating strategy corresponds to a set of determined state value parameters of all thermal resistances; The vehicle thermal management system determines the resistance values ​​of all thermal resistors based on the state value parameters, determines the current flow path of the working fluid in the vehicle thermal management system based on the resistance values ​​of all thermal resistors, obtains the current key indicator parameters and component temperatures under the current flow path, and returns to S6.

7. The vehicle thermal management method based on a multi-strategy universal loop according to claim 6, characterized in that: The resistance values ​​of all thermal resistors are: Among them, R ini It represents the thermal resistance of the heat source component, heat dissipation or heat storage component and the thermal resistance of the driving component in the initial vehicle circuit. The thermal resistance of the heat source component, heat dissipation or heat storage component and the thermal resistance of the driving component in the initial vehicle circuit are equal and are all R ini , δ j,1 Indicates thermal resistance R j,1 The state value parameter, δ j,n Indicates thermal resistance R j,n The state value parameter, δ k,1 , δ k,2 , δ k,4s-6 , δ k,4s-5 , δ k,4s-4 , δ k,4s-3 , δ k,4s-2 , δ k,4s-1 , δ k,4s , δ k,4N-2 Represents thermal resistance R k,1 , R k,2 , R k,4s-6 , R k,4s-5 , R k,4s-4 , R k,4s-3 , R k,4s-2 , δ k,4s-1 , δ k,4s , R k,4N-2 The state value parameter, C p,clt is the specific heat capacity of the working fluid at constant pressure, is the coolant mass flow rate in the circuit.

8. The vehicle thermal management method based on a multi-strategy universal loop according to claim 7, characterized in that: The state value parameter is 0 or 1. When the state value parameter is 0, the thermal resistance value corresponding to the state value parameter is infinite; when the state value parameter is 1, the thermal resistance value corresponding to the state value parameter is the actual resistance value of the thermal resistor.

9. The vehicle thermal management method based on a multi-strategy universal loop according to claim 6, characterized in that: The movement direction of the working fluid of the first heat source basic unit, the thermal resistance of the driving component, the driving component and the first heat dissipation or heat storage basic unit is: After passing through the driving component, the working fluid passes through the first heat dissipation or heat storage basic unit, the first heat source basic unit and the driving component thermal resistance in sequence, and then enters the driving component again.

10. The vehicle thermal management method based on a multi-strategy universal loop according to claim 6, characterized in that: In S6, the calculation process of the component temperature is as follows: Temperature changes of each heat source component, heat dissipation or heat storage component and driving component over time The calculation can be performed based on the law of conservation of energy. The temperature of the component can be obtained based on the change of temperature over time. The formula is uniformly expressed as: Among them, C comp is the heat capacity of the heat source component, heat dissipation or heat storage component, and driving component, T comp is the working fluid temperature at the outlet of the heat source component, heat dissipation or heat storage component, and drive component, T i is the temperature of the i-th upstream component adjacent to the heat source component, heat dissipation or heat storage component, and driving component, C comp 、T comp With T i The formula describes the same component. If the target component has multiple upstream components, calculate each upstream component. And sum it up. For the n-1th heat source component, its upstream component is the nth heat source component or the 1st to Nth heat dissipation or heat storage components. For the Mth heat source component, its upstream component is the 1st to Nth heat dissipation or heat storage components. For the 1st heat dissipation or heat storage component, its upstream component is the driving component. For the sth heat dissipation or heat storage component, its upstream component is the s-1th heat dissipation or heat storage component or the driving component. For the driving component, its upstream component is the 1st heat source component and all other heat source components connected in parallel with 1 heat source component. At this time, T i Take the temperature of the first heat source component and all other heat source components connected in parallel with the first heat source component after mixing at the component outlet, R i It is the sum of all thermal resistances between the heat source component, the heat dissipation or heat storage component, the driving component and its adjacent upstream component, T i With R i Corresponding to the same upstream component, q comp is the amount of heat generated by the heat source component, heat dissipation or heat storage component and driving component, and i represents the i-th upstream component.

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