New energy vehicle power domain control reverse dragging protection method

Abstract

The invention provides a new energy vehicle power domain control reverse dragging protection method which comprises the following steps that a whole vehicle is dragged under the condition that a power source is turned off, and a motor generates counter electromotive force to charge a direct current bus capacitor; power is supplied to the power management chip through the flyback circuit; waking up the domain controller; the domain controller awakens a low-voltage power supply system of the whole vehicle and monitors temperature information and the rotating speed of a motor through inter-nuclear communication, and the temperature information comprises the temperature of the motor and the temperature of an electric control module; the heat management system carries out heat dissipation and cooling according to the motor temperature and the electric control module temperature; and when the rotating speed of the motor is identified to be greater than the preset rotating speed upper limit value, the motor enters an active short-circuit mode, and the motor system loop heat management system works according to the maximum heat dissipation capability. Safety monitoring can be effectively carried out on the motor and electric control, and the risks of motor overheating and vehicle spontaneous combustion are reduced.

Description

Technical Field

[0001] The present invention relates to the automotive field, and in particular to a new energy vehicle power domain control anti-drag protection method. Background Art

[0002] At present, with the development of new energy technology, there are more and more electric vehicles on the market, and reverse drag of electric vehicle drive motors occurs from time to time. However, since it is impossible to constrain the vehicle state when the motor is reversed, there is a situation where the vehicle is dormant and the motor reverses, but the motor system enters an active short circuit due to self-protection, generating a lot of heat on the motor windings and control modules. At this time, since the various controllers of the vehicle are not awake, the thermal management of the whole vehicle cannot meet the cooling needs of the motor system.

[0003] Existing technologies are unable to conduct safety monitoring of components / modules such as motors and electronic controls. Motors are prone to overheating, damaging components of motor controllers and drive circuits. Motor overheating can also easily cause vehicle spontaneous combustion. Summary of the invention

[0004] In view of the defects in the prior art, the purpose of the present invention is to provide a new energy vehicle power domain control anti-drag protection method, which aims to effectively monitor the safety of the motor and electronic control, and reduce the risk of motor overheating and vehicle spontaneous combustion.

[0005] In order to achieve the above-mentioned object of the invention, the present invention adopts the following technical solution:

[0006] The present invention provides a new energy vehicle power domain control anti-drag protection method, comprising the following steps:

[0007] When the vehicle is towed with the power off, the motor generates back EMF to charge the DC bus capacitor;

[0008] Power the power management chip through the flyback circuit;

[0009] Wake up the domain controller;

[0010] The domain controller wakes up the low-voltage power supply system of the vehicle and monitors temperature information and motor speed through inter-core communication. The temperature information includes motor temperature and electronic control module temperature.

[0011] The thermal management system performs heat dissipation and cooling according to the temperature of the motor and the temperature of the electronic control module;

[0012] When it is detected that the motor speed is greater than the preset upper speed limit, the motor enters the active short-circuit mode, and the motor system loop thermal management system operates at its maximum heat dissipation capacity.

[0013] Preferably, the method further comprises: after the domain controller is directly awakened by the flyback circuit, monitoring the IGBT state through inter-core communication.

[0014] Compared with the prior art, the present invention has the following beneficial effects:

[0015] The present invention supplies power to the front end of the power management chip through a flyback circuit, which can directly wake up the domain controller and synchronously wake up the low-voltage power supply of the entire vehicle. Overload of the flyback circuit will not occur, and the temperature changes of the motor system are effectively monitored to ensure vehicle safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] 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:

[0017] Figure 1 Schematic diagram of the process described in the embodiment. DETAILED DESCRIPTION

[0018] 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.

[0019] 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.

[0020] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. 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 in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indication will also change accordingly.

[0021] Example

[0022] In the prior art, most thermal management wake-up methods for anti-drag protection are performed through the CAN bus, and cooling requests are made only after the temperature reaches a certain value. This wake-up solution needs to support CAN network wake-up, but there is also the problem of untimely cooling, which may cause the motor or electronic control module to overheat and be damaged due to untimely heat dissipation.

[0023] This embodiment provides a new energy vehicle power domain control anti-drag protection method, which can use the back electromotive force generated by the motor itself to power the power management chip (SBC) through the flyback circuit (Flyback), thereby waking up the domain controller, which in turn wakes up the low-voltage system of the entire vehicle and monitors the temperature and motor speed through inter-core communication. Thermal management monitors the temperature of the motor system in real time. If the motor is found to be in ASC (active short circuit) mode, it will work at the maximum heat dissipation energy.

[0024] Specifically, the method of this embodiment includes the following steps: Figure 1 As shown:

[0025] Step 1: The vehicle is towed with the power off and the MCU in sleep mode.

[0026] Step 2: The motor generates back EMF to charge the DC bus capacitor.

[0027] Step 3: Power the SBC through the Flyback circuit. The flyback circuit is mainly used to convert the input voltage into the required output voltage, while providing isolation, receiving the back electromotive force generated by the motor, and converting it into stable electrical energy to power the power management chip (SBC), which is used to wake up the domain controller and the vehicle's low-voltage system.

[0028] Step 4: Wake up the domain controller, which then wakes up the vehicle's low-voltage power supply system and monitors temperature information and motor speed through inter-core communication. The temperature information includes at least the motor temperature and the electronic control module temperature to better avoid overload operation of the flyback circuit. Furthermore, after the domain controller is directly awakened by the flyback circuit, it monitors the IGBT (insulated gate bipolar transistor) state through inter-core communication. Inter-core communication can provide efficient and real-time status monitoring, especially for the transmission of temperature and speed data in the domain controller of a multi-core processor.

[0029] Step 5: The thermal management system starts to work, dissipating heat and cooling according to the different motor temperatures and electronic control module temperatures to meet cooling requirements. Thermal management is the key to safe system operation. Through active wake-up and real-time cooling, the motor or module is prevented from being damaged due to excessive temperature, significantly improving the safety and reliability of new energy vehicles.

[0030] Step 6: When it is detected that the motor speed is greater than the preset upper speed limit, the motor enters the ASC (active short circuit) mode.

[0031] Step 7: The motor system loop thermal management system operates at its maximum heat dissipation capacity.

[0032] Furthermore, in order to achieve thermal management protection in the trailer scenario, this embodiment can not only wake up the domain controller and then wake up the vehicle low-voltage system through the motor back electromotive force generated by the motor rotation, but also increase the speed wake-up requirement for the ABS system (anti-lock braking system) to achieve similar technical effects. Specifically, the wheel speed information is identified by the wheel speed sensor, and the ABS system determines that the vehicle is in the trailer state based on the wheel speed information.

[0033] This embodiment does not need to interact through the CAN network, but directly interacts through the inter-core communication inside the chip, and can actively wake up and monitor in real time whether the temperature of the motor system is within the normal range, and can provide different thermal management cooling requirements according to temperature changes. This embodiment supplies power to the front end of the power management chip through the flyback circuit, which can directly wake up the domain controller and synchronously wake up the low-voltage power supply of the entire vehicle, without overloading the flyback circuit. At the same time, it effectively monitors the temperature changes of the motor system and ensures the safety of the vehicle.

[0034] 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 new energy vehicle power domain control anti-drag protection method, characterized in that: The steps include: When the vehicle is towed with the power off, the motor generates back EMF to charge the DC bus capacitor; Power the power management chip through the flyback circuit; Wake up the domain controller; The domain controller wakes up the low-voltage power supply system of the vehicle and monitors temperature information and motor speed through inter-core communication. The temperature information includes motor temperature and electronic control module temperature. The thermal management system performs heat dissipation and cooling according to the temperature of the motor and the temperature of the electronic control module; When it is detected that the motor speed is greater than the preset upper speed limit, the motor enters the active short-circuit mode, and the motor system loop thermal management system operates at its maximum heat dissipation capacity.

2. According to claim 1, a new energy vehicle power domain control anti-drag protection method is characterized in that: Also includes: After the domain controller is directly awakened by the flyback circuit, it monitors the IGBT status through inter-core communication.

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