Calibration method and calibration device for electric vehicle thermal management system

Abstract

The present invention discloses a calibration method and a calibration device for a thermal management system of an electric vehicle. The calibration method comprises: integrating CAN basic data into an integrated thermal management system, wherein the integrated thermal management system monitors global variables of vehicle status information in real time; the thermal management device performs thermal management on a functional unit to be calibrated according to a preset program so that the functional unit to be calibrated reaches a target temperature; planning a driving route according to the requirements of different seasons and different working conditions, executing the planned driving route, and calibrating the parameter value of the current thermal management device when the functional unit to be calibrated reaches the target temperature and the heat generated by the thermal management device is equivalent to the actual heat generated.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management control and calibration, and in particular to a calibration method and a calibration device for a thermal management system of an electric vehicle. Background Art

[0002] With the rapid development of electric vehicles, the vehicle thermal management system has become more important. In order to ensure the stability and reliability of the entire system, in addition to the system design, the calibration of a large number of system parameters under different working conditions is also extremely important.

[0003] Traditional calibration typically involves a driver and one or two engineers per vehicle. New energy vehicles also typically undergo one or two high-temperature and high-cold road test calibrations. These tests are labor-intensive and challenging, creating a harsh working environment that can be challenging for both drivers and engineers. Furthermore, calibration cycles are lengthy and inefficient. Furthermore, thermal management calibration is typically performed on a single item, lacking comprehensive management. Summary of the Invention

[0004] In response to the above technical problems, the present invention provides a calibration method and a calibration device for an electric vehicle thermal management system, which can achieve comprehensive and global calibration of thermal management.

[0005] A first aspect of the present invention provides a calibration method for an electric vehicle thermal management system, comprising:

[0006] Integrate CAN (Controller Area Network) basic data into the integrated thermal management system, which monitors global variables of vehicle status information in real time. The thermal management device uses a preset program to perform thermal management on the functional unit to be calibrated, so that the functional unit to be calibrated reaches the target temperature.

[0007] The driving route is planned according to the requirements of different seasons and different working conditions. When the planned driving route is executed and the functional unit to be calibrated reaches the target temperature and the heat generated by the thermal management device is equivalent to the actual heat generated, the parameter value of the current thermal management device is calibrated.

[0008] Optionally, integrating the CAN basic data into the integrated thermal management system includes:

[0009] The basic data collected by the CAN communication data acquisition equipment is integrated into the code of the integrated thermal management system so that the integrated thermal management system can automatically determine the current state of the system.

[0010] Optionally, the integrated thermal management system monitors the vehicle status information global variables in real time, including:

[0011] The status information related to thermal management in the vehicle status is uniformly monitored in real time, and the vehicle status information is used as a global variable for real-time monitoring. The status information related to thermal management in the vehicle status at least includes head temperature, air outlet temperature, foot temperature, and water circuit coolant temperature.

[0012] Optionally, the calibration method also includes: arranging sensors at distribution points of the vehicle, the distribution points including cabin comfort points, air inlet and outlet of the air-conditioning box, three-electric water circuits, and heat pump system pipelines, and the sensors are connected to the integrated thermal management system.

[0013] Optionally, the calibration method also includes: the integrated thermal management system monitors the global variables of the vehicle status information in real time, and when the heat generated by the thermal management device is greater than or less than the actual heat generated, the P value and I value of the thermal management device parameter value are controlled to be increased or decreased.

[0014] Optionally, the functional units to be calibrated include a heat pump and a power battery.

[0015] A second aspect of the present invention provides a calibration device for an electric vehicle thermal management system, comprising:

[0016] The information acquisition module is used to integrate CAN basic data into the integrated thermal management system, which monitors the global variables of vehicle status information in real time;

[0017] A thermal management device, used to control the functional unit to be calibrated according to a preset program so that the functional unit to be calibrated reaches a target temperature;

[0018] The calibration module is used to plan driving routes according to the requirements of different seasons and different working conditions. When the planned driving route is executed and the functional unit to be calibrated reaches the target temperature and the heat generated by the thermal management device is equivalent to the actual heat generated, the parameter value of the current thermal management device is calibrated.

[0019] Optionally, the information collection module includes:

[0020] A monitoring unit is used to uniformly monitor the status information related to thermal management in the vehicle status in real time, and use the vehicle status information as a global variable for real-time monitoring. The status information related to thermal management in the vehicle status includes at least head temperature, air outlet temperature, foot temperature, and water circuit coolant temperature.

[0021] According to a third aspect of an embodiment of the present invention, a vehicle is provided, comprising a processor, a memory, and a computer program stored in the memory and capable of running on the processor, wherein when the computer program is executed by the processor, the calibration method as described in the first aspect of the embodiment of the present invention is implemented.

[0022] According to a fourth aspect of the embodiments of the present invention, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a computer, the calibration method according to the first aspect of the embodiments of the present invention is executed.

[0023] The present invention directly integrates CAN basic data into the CAN basic data of the thermal management system, and the thermal management system directly monitors the global variables of the vehicle, thereby completing direct control of the thermal management device and completing thermal management calibration for different seasons and working conditions. Compared with the existing technology and single-item calibration methods, the calibration efficiency of the present invention is higher and the calibration results are more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of a flow chart of a calibration method for an electric vehicle thermal management system according to an embodiment of the present invention;

[0025] Figure 2 Schematic diagram of a flow chart of a power battery calibration method according to an embodiment of the present invention;

[0026] Figure 3 Schematic diagram of a module of a calibration device for an electric vehicle thermal management system according to an embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without making any creative efforts shall fall within the scope of protection of the present invention.

[0028] See also Figure 1 The electric vehicle thermal management system calibration method provided by the present invention comprises the following steps:

[0029] Step 110: Integrate the CAN basic data into the integrated thermal management system, which monitors the global variables of the vehicle status information in real time.

[0030] There are calibration methods for power batteries in the prior art, which are single-item calibration methods, that is, they only calibrate the power battery and cannot calibrate for different states. For example, there are thermal capacity calibration methods for power batteries in the prior art, which mainly calculate and calibrate the temperature difference between the front and rear of the power battery, rather than calibrating the thermal management device.

[0031] The present invention integrates the CAN communication data of the sensors of the systems that need to be calibrated in new energy electric vehicles into the DBC (Database Can, CAN basic data) of a unified thermal management system (ITMS) for calibration. The systems that need to be calibrated generally include automotive air conditioning comfort, heat pump control system, and three-electric thermal management system; for example, they include (1) calibration of high-temperature circuit cooling strategies for components such as the engine (hybrid) and motor; (2) calibration of battery cooling strategies; (3) calibration of passenger compartment cooling strategies; (4) calibration of battery heating strategies; (5) calibration of passenger compartment heating strategies; (6) calibration of defrosting and defogging strategies; (7) calibration of coordinated cooling strategies for the battery and passenger compartment; and (8) calibration of coordinated heating strategies for the battery and passenger compartment.

[0032] The present invention utilizes an integrated thermal management system to monitor vehicle status information in real time. All vehicle status information forms global variables within the thermal management system, enabling calibration of multiple systems across the entire vehicle, achieving integrated control of the entire vehicle. For example, calibrating the coordinated heating strategy for the battery and passenger compartment requires coordinated control of the air conditioning and water circuit coolant. If both functional units being calibrated involve a specific thermal management device, their control parameters can be adjusted synchronously.

[0033] Specifically, sensors are deployed throughout the vehicle to monitor heat. CAN communication data acquisition equipment collects basic data, and vehicle status information is obtained based on this basic data. For example, information on coolant temperature, cabin temperature, and power battery temperature can be obtained. This sensor data is reflected as variable parameters in the integrated thermal management system, which can be calibrated based on these variable parameters.

[0034] In this embodiment, sensors can be deployed at various locations throughout the vehicle, including cabin comfort points, air conditioning unit air inlets and outlets, the three-electric water circuit, and heat pump system piping, and connected to the integrated thermal management system. The integrated thermal management system monitors vehicle status information related to thermal management in a unified, real-time manner, using this information as a global variable for real-time monitoring. This information includes at least head temperature, air outlet temperature, foot temperature, and water circuit coolant temperature. Adjusting at least one of these temperatures may require considering the parameters of multiple thermal management devices.

[0035] Step 120: The thermal management device performs thermal management on the functional unit to be calibrated according to a preset program, so that the functional unit to be calibrated reaches the target temperature.

[0036] The thermal management device can be one or multiple functional modules, such as a DC PTC heater, a high-voltage heater, or an air conditioning compressor, and can implement thermal management according to a predefined program. For example, the initial temperature of the coolant and the initial temperature of the power battery can be obtained separately. The corresponding integrated thermal management system includes the specific heat C of the power coolant and the mass m parameter of the coolant in the battery cooling system. By calculating the difference between the target temperature and the initial temperature, calibration can be performed based on the initial and target temperatures and these two parameters.

[0037] The functional units to be calibrated include heat pumps, power batteries, etc., and of course may also include refrigeration functional modules.

[0038] Step 130: Plan a driving route according to the requirements of different seasons and different working conditions. When the planned driving route is executed and the functional unit to be calibrated reaches the target temperature and the heat generated by the thermal management device is equivalent to the actual heat generated, calibrate the parameter value of the current thermal management device.

[0039] Based on existing autonomous driving technology, calibration conditions can be developed, including highway, urban, and hill-climbing conditions in spring, autumn, summer, and winter. After planning a driving route, autonomous road calibration experiments can begin for the electric vehicle's thermal management system. For example, using the power battery coolant as an example, the required heat Q is calculated based on the target temperature, and the actual heat Q1 generated during a given period is calculated. A determination is then made as to whether Q and Q1 are identical. If so, the current thermal management device parameter values ​​are determined to be appropriate for the current operating conditions, completing the calibration. If not, the current thermal management device parameter values ​​need to be adjusted, for example, by increasing or decreasing them. Other calibrations, such as those for the air conditioner, are also ongoing during this process, so adjustments to the thermal management device parameters need to be coordinated with the air conditioner calibration. The thermal management device parameter adjustments should be repeated repeatedly until Q and Q1 are identical.

[0040] For example, after the PTC heater is turned on, the battery cooling pump can be simultaneously activated to accelerate the circulation of coolant in the battery cooling system. During this process, the PTC heater's P (power) and I (current) parameters can be adjusted. This adjustment process is performed over a set time, t, and cyclically adjusted to achieve the target temperature. The target temperature setting can vary, and those skilled in the art can flexibly adjust it.

[0041] As can be seen from the above, the electric vehicle thermal management system calibration method provided by the present invention directly uses sensor-collected data as the CAN basic data of the integrated thermal management system to obtain global variables of vehicle status information. The representative functional unit of the thermal management device is used to reach the target temperature, and then the parameter values ​​of the thermal management device are cyclically adjusted until calibration is completed. The present invention can complete thermal management calibration for different seasons and operating conditions. Compared with existing technologies and single-item calibration methods, the present invention can obtain global vehicle status information. Utilizing vehicle status information can make calibration more efficient and the calibration results more accurate.

[0042] like Figure 2 FIG. 1 shows an exemplary calibration process for a power battery, including the following steps:

[0043] S0: vehicle cold start;

[0044] The basic data collected by CAN communication data acquisition equipment such as sensors are integrated into the code of the integrated thermal management system as variable parameters in order to calculate the heat required to achieve the target temperature. The basic data as variable parameters can enable the integrated thermal management system to automatically determine the state of the functional unit to be calibrated and judge the current state of the system.

[0045] S1: Calculate the heat Q that PCT needs to generate based on the target water inlet temperature of the battery, and the heat Q1 actually generated during a certain time t;

[0046] Specifically, we can use the formula Q=C 冷却液 m(T 目标水温 -T 实际水温 ) Calculate the target power battery coolant temperature and the required energy. Where C is the coolant specific heat and m is the coolant mass.

[0047] Because the integrated thermal management system monitors the power battery and coolant temperatures in real time, it can compare the required heat generated by the PCT heater and the actual heat generated during the thermal management process. This allows for a determination based on the actual power battery temperature. Calibration is then performed based on this determination, performing the following steps.

[0048] S2: Determine whether Q1 is equal to Q;

[0049] If so, proceed to step S6 to confirm that the current parameter value is a more appropriate value for the current working condition;

[0050] If not, proceed to step S3 to determine whether Q1 is greater than Q. If so, proceed to step S4 to reduce the P and I values ​​of the PCT heater. If not, proceed to step S5 to increase the P and I values ​​of the PCT heater. The process then loops back to step S1 after steps S4 and S5 until the determination result of step S6 is reached.

[0051] The integrated thermal management system monitors the global variables of the vehicle status information in real time. When the heat generated by the thermal management device is greater than or less than the actual heat generated, the P value and I value of the thermal management device parameter value are controlled to be increased or decreased.

[0052] In the above embodiment, using power battery heating as an example, when the vehicle is charging and the battery temperature falls below a certain value, the PTC heater is requested to activate. The integrated thermal management system calculates the target outlet water temperature of the PTC heater based on data such as the power battery water temperature and the ambient temperature. This is combined with a PID algorithm (closed-loop control algorithm) to calculate the required PTC power. Therefore, the calculation parameters need to be adjusted based on the PTC heater's heating time and the actual outlet water temperature. If the PTC heater water temperature falls below the target after a certain period of time, the P and I coefficients are increased. If the PTC heater water temperature exceeds the target after a certain period of time, the P and I coefficients are decreased until the parameter values ​​are appropriate for the current operating conditions, completing the calibration.

[0053] like Figure 3 As shown, the present invention also provides a calibration device for an electric vehicle thermal management system, comprising:

[0054] The information acquisition module 31 is used to integrate the CAN basic data into the integrated thermal management system, and the integrated thermal management system monitors the global variables of the vehicle status information in real time;

[0055] Exemplarily, sensors can be arranged at locations throughout the vehicle, including cabin comfort points, air inlets and outlets of the air-conditioning box, three-electric water circuits, and heat pump system pipelines, and the sensors are connected to the integrated thermal management system.

[0056] The thermal management device 32 is used to control the functional unit to be calibrated according to a preset program so that the functional unit to be calibrated reaches the target temperature;

[0057] The calibration module 33 is used to plan driving routes according to the requirements of different seasons and different working conditions, and to calibrate the parameter value of the current thermal management device when the functional unit to be calibrated reaches the target temperature and the heat generated by the thermal management device is equivalent to the actual heat generated.

[0058] Exemplarily, the integrated thermal management system monitors the global variables of the vehicle status information in real time, and when the heat generated by the thermal management device is greater than or less than the actual heat generated, controls the P value and I value of the thermal management device parameter value to be increased or decreased.

[0059] The information acquisition module 33 includes: a monitoring unit, which is used to uniformly monitor the status information related to thermal management in the vehicle status in real time, and use the vehicle status information as a global variable for real-time monitoring. The status information related to thermal management in the vehicle status at least includes head temperature, air outlet temperature, foot temperature, and water circuit coolant temperature.

[0060] The remaining parts of the calibration device of the electric vehicle thermal management system can be referred to Figures 1 to 2 The contents described in the embodiments will not be repeated here.

[0061] The present invention also provides a vehicle comprising a processor, a memory, and a computer program stored in the memory and capable of running on the processor, wherein the computer program, when executed by the processor, implements the steps of the above-mentioned method for calibrating the thermal management system of an electric vehicle.

[0062] The present invention also provides a computer-readable storage medium storing a computer program, which implements the steps of the above-mentioned method for calibrating the thermal management system of an electric vehicle when executed by a processor.

[0063] It is understood that computer-readable storage media may include: any entity or device capable of carrying a computer program, recording media, USB flash drives, mobile hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), and software distribution media, etc. A computer program includes computer program code. The computer program code may be in source code form, object code form, an executable file, or some intermediate form, etc. Computer-readable storage media may include: any entity or device capable of carrying a computer program code, recording media, USB flash drives, mobile hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), and software distribution media, etc.

[0064] In certain embodiments of the present invention, the device may include a controller, which is a single-chip microcomputer chip that integrates a processor, memory, a communication module, etc. The processor may refer to the processor contained in the controller. The processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA), other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0065] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, segment or portion of code comprising one or more executable instructions for implementing the steps of a specific logical function or process, and the scope of the preferred embodiments of the present invention includes alternative implementations in which functions may be performed out of the order shown or discussed, including performing functions in a substantially simultaneous manner or in the reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present invention pertain.

[0066] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the above description has generally described the composition and steps of each example according to function. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0067] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A calibration method for an electric vehicle thermal management system, characterized in that: include: Integrate CAN basic data into the integrated thermal management system, which monitors global variables of vehicle status information in real time; The thermal management device performs thermal management on the functional unit to be calibrated according to a preset program so that the functional unit to be calibrated reaches the target temperature; The driving route is planned according to the requirements of different seasons and different working conditions. When the planned driving route is executed and the functional unit to be calibrated reaches the target temperature and the heat generated by the thermal management device is equivalent to the actual heat generated, the parameter value of the current thermal management device is calibrated.

2. The calibration method according to claim 1, characterized in that: The integration of CAN basic data into the integrated thermal management system includes: The basic data collected by the CAN communication data acquisition equipment is integrated into the code of the integrated thermal management system so that the integrated thermal management system can automatically determine the current state of the system.

3. The calibration method according to claim 1, characterized in that: The calibration method also includes: arranging sensors at distribution points throughout the vehicle, the distribution points including cabin comfort points, air inlets and outlets of the air-conditioning box, three-electric water circuits, and heat pump system pipelines, and the sensors are connected to the integrated thermal management system.

4. The calibration method according to claim 1, characterized in that: The functional units to be calibrated include a heat pump and a power battery.

5. A calibration device for an electric vehicle thermal management system, characterized in that: include: The information acquisition module is used to integrate CAN basic data into the integrated thermal management system, which monitors the global variables of vehicle status information in real time; A thermal management device, used to control the functional unit to be calibrated according to a preset program so that the functional unit to be calibrated reaches a target temperature; The calibration module is used to plan driving routes according to the requirements of different seasons and different working conditions. When the planned driving route is executed and the functional unit to be calibrated reaches the target temperature and the heat generated by the thermal management device is equivalent to the actual heat generated, the parameter value of the current thermal management device is calibrated.

6. A vehicle, characterized in that: The device comprises a processor, a memory, and a computer program stored in the memory and capable of running on the processor, wherein the computer program implements the calibration method according to any one of claims 1 to 4 when executed by the processor.

7. A computer-readable storage medium, characterized in that A computer program is stored thereon, and when the computer program is run by a computer, the calibration method according to any one of claims 1 to 4 is executed.

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