Automotive thermal management active cooling method and system and automobile

Abstract

The invention provides an automotive thermal management active cooling method and system and an automobile, and the method comprises the following steps: S1, loss calculation: respectively calculating first total loss and second total loss, the first total loss is calculated based on controller loss and motor loss, and the second total loss is calculated based on controller loss and motor loss; the second total loss is calculated based on the electric power input by the motor controller and the mechanical power of the electric drive system; s2, obtaining a loss result: taking a smaller value of the first total loss and the second total loss as the loss result; and S3, heat management control: the motor controller looks up a table to determine the power required by the heat management component according to the loss result, and controls the heat management component according to the power required by the heat management component. According to the invention, based on the total loss of the motor controller and the motor, the motor controller directly controls the thermal management part, so that the hysteresis of thermal management cooling can be solved, and the total loss is checked in two modes, so that the control accuracy is ensured.

Description

Technical Field

[0001] The present invention relates to the field of automobile technology, and in particular to a method, system and automobile for active cooling of thermal management for new energy vehicles based on motor and electronic control losses. Background Art

[0002] At present, the thermal management cooling method of the electric drive system of new energy vehicles is generally to receive the temperature signal of the electric drive system through the vehicle controller. When the temperature of the electric drive system rises, the control power of the water pump, oil pump, fan, etc. is increased. However, there is a certain hysteresis in the temperature rise of the electric drive system. This control method will cause cooling hysteresis, resulting in failure to provide heat dissipation guarantee for the electric drive system in time. In the previously applied patents, either the vehicle controller controls through a temperature lookup table, or the motor controller cools through a fixed value. The former has the problem of slow control response speed, resulting in failure to provide cooling for the electric drive system in time, and the latter leads to a significant decrease in control accuracy, which cannot meet the needs well. Summary of the invention

[0003] In view of the defects in the prior art, the purpose of the present invention is to provide a thermal management active cooling method, system and vehicle for new energy vehicles based on motor and electronic control losses. Based on the total loss of the motor controller and the motor, the motor controller directly controls the thermal management components, thereby solving the lag of thermal management cooling, and the total loss is checked by two methods to ensure the accuracy of control.

[0004] In order to achieve the above-mentioned object of the invention, the present invention provides the following technical solutions:

[0005] According to a first aspect of the present invention, there is provided a method for active cooling of thermal management for new energy vehicles based on motor and electric control losses, comprising the following steps:

[0006] S1. Loss calculation: calculate the first total loss and the second total loss respectively;

[0007] The first total loss is calculated based on the controller loss and the motor loss, the controller loss includes the IGBT loss and the diode loss, and the motor loss includes the mechanical loss, the iron loss and the copper loss;

[0008] The second total loss is calculated based on the electric power input by the motor controller and the mechanical power of the electric drive system, and the mechanical power of the electric drive system is calculated by the torque and speed of the motor;

[0009] S2, obtaining a loss result: comparing the first total loss and the second total loss calculated in step S1, and taking the smaller value as the loss result;

[0010] S3. Thermal management control: The motor controller determines the required power of the thermal management component by looking up the table based on the loss result obtained in step S2, and controls the thermal management component accordingly.

[0011] Preferably, in step S1, the IGBT loss includes IGBT switching loss and conduction loss, and the diode loss includes diode conduction loss.

[0012] Preferably, when the motor is an oil-cooled motor, in step S3, the thermal management components include a drive system loop water pump, a fan and a motor oil pump.

[0013] Preferably, when the motor is a water-cooled motor, in step S3, the thermal management component includes a drive system loop water pump and a fan.

[0014] According to a second aspect of the present invention, a thermal management active cooling system for new energy vehicles based on motor and electric control losses is provided, comprising the following functional modules:

[0015] Loss calculation module: capable of calculating the first total loss and the second total loss;

[0016] The first total loss is calculated based on the controller loss and the motor loss, the controller loss includes the IGBT loss and the diode loss, and the motor loss includes the mechanical loss, the iron loss and the copper loss;

[0017] The second total loss is calculated based on the electric power input by the motor controller and the mechanical power of the electric drive system, and the mechanical power of the electric drive system is calculated by the torque and speed of the motor;

[0018] Loss comparison module: capable of comparing the first total loss and the second total loss and taking the smaller value as the loss result;

[0019] Thermal management control module: can determine the required power of the thermal management component based on the loss result table, and control the thermal management component accordingly.

[0020] Preferably, the IGBT loss includes IGBT switching loss and conduction loss, and the diode loss includes diode conduction loss.

[0021] Preferably, when the motor is an oil-cooled motor, the thermal management component includes a drive system circuit water pump, a fan and a motor oil pump.

[0022] Preferably, when the motor is a water-cooled motor, the thermal management component includes a drive system loop water pump and a fan.

[0023] According to a third aspect of the present invention, there is provided a new energy vehicle, comprising the thermal management active cooling system for new energy vehicles based on motor and electronic control losses as described in any one of the second aspect of the present invention.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The vehicle thermal management active cooling method, system and vehicle based on motor and electronic control losses provided by the present invention simultaneously consider IGBT and motor losses in the process of calculating the total loss, which is different from the prior art that only focuses on IGBT losses. The total loss is verified in two ways to ensure the accuracy of the calculation and avoid calculation deviation. Furthermore, the motor controller / thermal management control module determines the power of thermal management components such as water pumps and fans by looking up the table according to the loss size, and then accurately controls the thermal management components as needed, overcoming the control lag problem existing in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0027] Figure 1 This is a flow chart of the active cooling method for thermal management of a vehicle based on motor and electric control losses as described in Example 1 of the present invention;

[0028] Figure 2 This is a simplified structural diagram of the vehicle thermal management active cooling system based on motor and electronic control losses described in Example 2 of the present invention.

[0029] The figure shows:

[0030] 101-loss calculation module;

[0031] 102-loss comparison module;

[0032] 103-Thermal Management Control Module DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0035] It should be noted that similar numbers and letters represent similar items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in the subsequent figures. In addition, all directional indications in this application (such as up, down, left, right, front, back, bottom...) are only used to explain the relative position relationship, movement, etc. between the components under a certain specific posture (as shown in the figures). If the specific posture changes, the directional indication will also change accordingly. Furthermore, the descriptions involving "first", "second", etc. in the application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated.

[0036] Example 1

[0037] This embodiment provides a thermal management active cooling method for new energy vehicles based on motor and electric control losses. Based on the calculation method of motor controller and motor loss, the first total loss is calculated on the basis of calculating the IGBT loss and diode loss of the motor controller, as well as the mechanical loss, iron loss, and copper loss of the drive motor. At the same time, the system efficiency of the electric drive system is considered together, and the second total loss is calculated by the electric power input by the motor controller and the mechanical efficiency of the electric drive system calculated by the torque and speed of the motor. The smaller value of the first total loss and the second total loss (Note: when the two values ​​are equal, any value is regarded as the smaller value) is taken as the loss result value, and then the motor controller is used to look up the table according to the size of the loss result value to determine the power of the thermal management components such as the water pump and fan of the drive system circuit, and then the water pump, fan and other thermal management components are accurately controlled as needed.

[0038] Specifically, Figure 1 As shown, the thermal management active cooling method for new energy vehicles based on motor and electric control losses provided in this embodiment includes the following steps:

[0039] S1. Loss calculation: Calculate the first total loss and the second total loss respectively, where:

[0040] The first total loss is calculated based on the controller loss and the motor loss. The controller loss includes the calculated IGBT loss (including IGBT switching loss and IGBT conduction loss) and diode loss (including diode conduction loss). The motor loss includes the calculated mechanical loss, iron loss and copper loss.

[0041] The second total loss is calculated based on the electric power input by the motor controller and the mechanical power of the electric drive system. The mechanical power of the electric drive system is calculated by the torque and speed of the motor.

[0042] S2. Obtain loss result: Compare the first total loss and the second total loss calculated in step S1, and take the smaller value as the loss result (Note: when the two values ​​are equal, either value is regarded as the smaller value);

[0043] S3. Thermal management control: Based on the loss result obtained in step S2, the motor controller determines the required power of the thermal management component by looking up the table, and controls the thermal management component accordingly. When the motor is an oil-cooled motor, the thermal management component includes a drive system circuit water pump, a fan and a motor oil pump; when the motor is a water-cooled motor, the thermal management component includes a drive system circuit water pump and a fan.

[0044] The active cooling method for automotive thermal management based on motor and electronic control losses provided in this embodiment considers both IGBT losses and motor losses in the process of calculating the total losses, which is different from the prior art that only focuses on IGBT losses, and the total losses are obtained by comparing the first total losses and the second total losses. This verification method ensures the accuracy of the calculation and avoids calculation deviations. Furthermore, the motor controller determines the power of thermal management components such as water pumps and fans by looking up the table according to the loss size, and then accurately controls the thermal management components as needed, overcoming the control lag problem existing in the prior art.

[0045] Example 2

[0046] This embodiment provides a thermal management active cooling system for new energy vehicles based on motor and electronic control losses. Figure 2 As shown, it includes the following functional modules:

[0047] Loss calculation module 101: capable of calculating a first total loss and a second total loss, wherein:

[0048] The first total loss is calculated based on the controller loss and the motor loss. The controller loss includes the calculated IGBT loss (including IGBT switching loss and IGBT conduction loss) and diode loss (including diode conduction loss). The motor loss includes the calculated mechanical loss, iron loss and copper loss.

[0049] The second total loss is calculated based on the electric power input by the motor controller and the mechanical power of the electric drive system. The mechanical power of the electric drive system is calculated by the torque and speed of the motor.

[0050] The loss comparison module 102 is capable of comparing the first total loss and the second total loss and taking the smaller value as the loss result (Note: when the two values ​​are equal, either value is regarded as the smaller value);

[0051] Thermal management control module 103: It can determine the required power of the thermal management component based on the loss result table, and control the thermal management component accordingly. When the motor is an oil-cooled motor, the thermal management component includes a drive system circuit water pump, a fan and a motor oil pump. When the motor is a water-cooled motor, the thermal management component includes a drive system circuit water pump and a fan.

[0052] The present embodiment provides a vehicle thermal management active cooling system based on motor and electronic control losses. The loss calculation module 101 considers both IGBT losses and motor losses in the process of calculating the total losses, which is different from the prior art that only focuses on IGBT losses. The total losses are obtained by comparing the first total losses with the second total losses through the loss comparison module 102. In this way, the accuracy of the obtained total losses is ensured and calculation deviations are avoided. Furthermore, the thermal management control module 103 determines the power of thermal management components such as water pumps and fans by looking up the table according to the total loss size, and then accurately controls the thermal management components as needed, overcoming the control lag problem existing in the prior art.

[0053] Example 3

[0054] A new energy vehicle comprises the new energy vehicle thermal management active cooling system based on motor and electronic control losses as described in Example 2.

[0055] The above describes the specific embodiments of the present invention. Based on the above description, relevant personnel can make various changes and modifications without departing from the technical concept of the present invention.

Claims

1. A thermal management active cooling method for new energy vehicles based on motor and electronic control losses, characterized in that: The steps include: S1. Loss calculation: calculate the first total loss and the second total loss respectively; The first total loss is calculated based on the controller loss and the motor loss, the controller loss includes the IGBT loss and the diode loss, and the motor loss includes the mechanical loss, the iron loss and the copper loss; The second total loss is calculated based on the electric power input by the motor controller and the mechanical power of the electric drive system, and the mechanical power of the electric drive system is calculated by the torque and speed of the motor; S2, obtaining a loss result: comparing the first total loss and the second total loss calculated in step S1, and taking the smaller value as the loss result; S3. Thermal management control: The motor controller determines the required power of the thermal management component by looking up the table based on the loss result obtained in step S2, and controls the thermal management component accordingly.

2. The active cooling method for thermal management of new energy vehicles based on motor and electric control losses according to claim 1 is characterized in that: In step S1 , the IGBT loss includes IGBT switching loss and conduction loss, and the diode loss includes diode conduction loss.

3. The active cooling method for thermal management of new energy vehicles based on motor and electric control losses according to claim 1 is characterized in that: When the motor is an oil-cooled motor, in step S3, the thermal management components include a drive system loop water pump, a fan and a motor oil pump.

4. The active cooling method for thermal management of new energy vehicles based on motor and electric control losses according to claim 1 is characterized in that: When the motor is a water-cooled motor, in step S3, the thermal management component includes a drive system loop water pump and a fan.

5. A thermal management active cooling system for new energy vehicles based on motor and electronic control losses, characterized in that: Includes the following functional modules: Loss calculation module: capable of calculating the first total loss and the second total loss; The first total loss is calculated based on the controller loss and the motor loss, the controller loss includes the IGBT loss and the diode loss, and the motor loss includes the mechanical loss, the iron loss and the copper loss; The second total loss is calculated based on the electric power input by the motor controller and the mechanical power of the electric drive system, and the mechanical power of the electric drive system is calculated by the torque and speed of the motor; Loss comparison module: capable of comparing the first total loss and the second total loss and taking the smaller value as the loss result; Thermal management control module: can determine the required power of the thermal management component based on the loss result table, and control the thermal management component accordingly.

6. The thermal management active cooling system for new energy vehicles based on motor and electric control losses according to claim 5 is characterized in that: The IGBT loss includes IGBT switching loss and conduction loss, and the diode loss includes diode conduction loss.

7. The thermal management active cooling system for new energy vehicles based on motor and electric control losses according to claim 5 is characterized in that: When the motor is an oil-cooled motor, the thermal management components include a drive system loop water pump, a fan and a motor oil pump.

8. The thermal management active cooling system for new energy vehicles based on motor and electric control losses according to claim 5 is characterized in that: When the motor is a water-cooled motor, the thermal management component includes a drive system loop water pump and a fan.

9. A new energy vehicle, characterized in that: An active cooling system for thermal management of new energy vehicles based on motor and electronic control losses as described in any one of claims 5 to 8.

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