Reverse wake-up method of distributed architecture based on CAN communication network and battery management system
By adopting the reverse wake-up method of distributed architecture in the battery management system of the CAN communication network, the motherboard controls the reverse wake-up power supply, dual power supply and diode isolation, the problem of high system power consumption is solved and low power is achieved Consumption and high reliability battery management extends battery life and improves system stability.
Patent Information
- Application Number
- CN202411556272.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-04
- Publication Date
- 2024-12-27
AI Technical Summary
In the battery management system of CAN communication network, the existing reverse wake-up method is difficult to achieve low power consumption and high reliability, especially in commercial vehicles and engineering machinery application scenarios, resulting in high power consumption and limited functions of the system.
Adopting the reverse wake-up method based on the CAN communication network, the motherboard controls the reverse wake-up power supply, dual power supply, diode isolation, and magnetic retention relay through the motherboard, combining intelligent wake-up judgment and false alarm processing to reduce power consumption and improve System stability.
It significantly reduces the overall power consumption of the system, extends battery life, and avoids mis-wake problems through independent local power supply management, and achieves efficient and reliable power management.
Smart Images
Figure CN119189908A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of battery management, and more particularly to a reverse wake-up method and a battery management system based on a distributed architecture of a CAN communication network. Background Art
[0002] In traditional battery management systems, to ensure continuous monitoring of the battery status, even when the vehicle is turned off, the system needs to rely on the real-time clock (RTC) to periodically wake up the master or slave control unit for inspection. Although this is effective, it significantly increases the system power consumption, which can easily lead to frequent exhaustion of low-voltage batteries and the need for frequent charging. In recent years, in order to optimize the monitoring energy efficiency of the battery throughout its life cycle, some acquisition chips have supported configuration in low-power monitoring mode, which significantly reduces energy consumption by reducing the acquisition frequency. In this mode, the management node is responsible for monitoring the results, and once the preset wake-up threshold is triggered, a continuous interrupt signal is issued to activate the power supply or microprocessor.
[0003] In battery management systems that use daisy-chain communication, this low-power strategy is particularly efficient because the slave control unit does not require an additional low-voltage power supply, and the wake-up circuit is centrally deployed on the mainboard, greatly reducing energy consumption. However, in application scenarios such as commercial vehicles and construction machinery, due to the long communication distance between the master and slave control and the complex electromagnetic environment, a more reliable CAN communication solution is often used. Under this architecture, each slave control requires an independent low-voltage power supply, enable switch, microprocessor and CAN transceiver, and the slave control power supply and enable are controlled by the mainboard.
[0004] To achieve the reverse wake-up function under this type of architecture, the industry has explored two main strategies: First, keep the slave power supply, put the microprocessor into low-power sleep mode, and activate the microprocessor through the reverse wake-up mechanism. However, under this solution, the DCDC converters of each slave control continue to work, and even if the microprocessor is in a low-power state, it continues to consume power, and the overall power consumption is still high.
[0005] Secondly, an innovative full power-off strategy is adopted, that is, the slave power supply and microprocessor are completely turned off, and the reverse wake-up signal comes from the monitored high-voltage battery pack. After signal isolation through optocouplers or digital isolators, the wake-up power supply activates the slave microprocessor. Although this solution greatly reduces power consumption, it is limited by the fact that the microprocessor's normal power supply comes from the monitored object - the battery pack. Therefore, in the low-power acquisition mode, the function is limited, mainly limited to the monitoring of basic parameters such as voltage and temperature.
[0006] Therefore, how to provide a reverse wake-up method and a battery management system with low power consumption and high reliability is a problem that those skilled in the art need to solve urgently. Summary of the invention
[0007] In view of this, the present invention provides a reverse wake-up method and a battery management system with a distributed architecture based on a CAN communication network, which realizes efficient power management and system stability and prolongs battery life through mainboard control of slave reverse wake-up power supply, dual power supply and diode isolation, magnetic holding relay to reduce power consumption, intelligent wake-up judgment and false alarm processing, and reverse wake-up mode.
[0008] In order to achieve the above object, the present invention adopts the following technical solution:
[0009] A reverse wake-up method based on a distributed architecture of a CAN communication network, comprising:
[0010] The master control determines whether the current state of the battery meets the low power monitoring condition according to the preset conditions, and if so, sends a low power monitoring instruction to the slave control; if not, turns off the slave control power supply;
[0011] The slave controller configures the low power consumption working mode according to the low power consumption monitoring instruction, and sends the configuration result to the master controller;
[0012] The main control determines whether to enter a low power consumption working mode according to the configuration result;
[0013] If not, sending a cancel low power consumption entry instruction to the slave controller;
[0014] If yes, the slave control power supply is turned off, low power consumption monitoring is turned on, and the battery status information is regularly detected. When a fault is detected, the slave control generates a wake-up signal to wake up the master control and report the fault information;
[0015] The master control selects whether to wake up the upper level device or remotely notify the user according to a preset strategy.
[0016] Preferably, the slave control configures the low power consumption working mode according to the low power consumption monitoring instruction and sends the configuration result to the master control, including:
[0017] After receiving the low-power monitoring instruction, the slave control determines whether the power supply of the slave control low-power monitoring is normal. If normal, the low-power monitoring chip is configured to enter the low-power working mode. After the configuration is completed, the configuration result of successful configuration is sent to the master control; if abnormal, the configuration result of failed configuration is sent to the master control.
[0018] Preferably, the main control determines whether to enter the low power consumption working mode according to the configuration result, including:
[0019] Determine whether all slave controller configuration results have been successfully received;
[0020] If yes, the slave power supply is turned off and the system enters low power consumption working mode;
[0021] If not, a cancel instruction is sent to the slave control to cancel entering the low power consumption working mode, and a cancel configuration response message is sent to the master control; the master control reports the fault information and performs fault processing.
[0022] Preferably, after the master control reports the fault information, it also includes:
[0023] Determine whether fault processing has timed out;
[0024] If the fault processing times out, shutting down the slave power supply;
[0025] If the fault processing has not timed out, continue waiting for processing.
[0026] Preferably, the battery status information is regularly detected, and when a fault is detected, the slave control generates a wake-up signal to wake up the master control and report the fault information, including:
[0027] Performing regular detection on the battery status information, and when a fault is detected, generating an interrupt signal to wake up the slave control power supply, and the slave control power supply wakes up the microprocessor;
[0028] The microprocessor obtains the source of the interrupt signal and the fault register information corresponding to the interrupt signal;
[0029] Confirm the wake-up information according to the interrupt signal source and the fault register information corresponding to the interrupt signal to determine whether the wake-up signal is valid;
[0030] When it is confirmed that the wake-up signal is valid, the wake-up signal is sent to wake up the main control and report fault information; if the wake-up signal is confirmed to be invalid, the number of times the wake-up signal is invalid is recorded. When it is confirmed that the number of invalid times of the wake-up signal exceeds a preset threshold, the main control is woken up, a false alarm fault is reported, and the fault register is cleared.
[0031] A battery management system based on a distributed architecture of a CAN communication network, used to implement the above-mentioned reverse wake-up method of a distributed architecture based on a CAN communication network, comprising: a master control unit, a plurality of slave control units, a low-voltage power supply, and a power supply maintenance unit; the low-voltage power supply is respectively connected to the master control unit and the slave control unit, the master control unit is connected to the slave control unit, the master control unit is also connected to the power supply maintenance unit, and the power supply maintenance unit is connected to the slave control unit;
[0032] The slave control unit includes a plurality of low-power monitoring and acquisition chips, a microprocessor, a wake-up module, other chips, and a slave control power supply unit.
[0033] Preferably, the slave-controlled power supply unit includes a main power supply module and a partial low-power power supply module, and the main power supply module and the partial low-power power supply module are isolated by a diode; the main power supply module is used for power supply in normal mode, and the partial low-power power supply module is used for power supply in the low-power working mode.
[0034] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a reverse wake-up method and a battery management system based on a distributed architecture of a CAN communication network. By adopting a low-power reverse wake-up solution based on a CAN communication network, the overall power consumption of the system is significantly reduced. The present invention uses a diode or an ideal diode to achieve isolation between low-power power supply and normal power supply, ensuring that the local power supply does not affect the normal operation of the chip. At the same time, multiple slave controls share the same local power supply, further improving energy efficiency. Secondly, when the present invention does not provide reverse wake-up power supply, the reverse wake-up function is automatically disabled to avoid the occurrence of false wake-up problems. In addition, the use of a magnetic latching relay to continuously power supply to maintain the normal power supply under shutdown further reduces the power consumption of the master control and enhances the stability of the system. Finally, the distributed architecture battery management system and reverse wake-up method provided by the patent of the present invention not only realize low-power monitoring and reverse wake-up functions, but also the local power supply is completely independent of the original slave control power supply and does not affect each other, thereby ensuring the normal operation of the system while achieving more efficient and reliable power management. BRIEF DESCRIPTION OF THE DRAWINGS
[0035] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.
[0036] Figure 1 This is a block diagram of a distributed architecture battery management system based on a CAN communication network;
[0037] Figure 2 Flow chart for entering low power monitoring mode;
[0038] Figure 3 This is the reverse wake-up flow chart. DETAILED DESCRIPTION
[0039] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0040] The embodiment of the present invention discloses a reverse wake-up method based on a distributed architecture of a CAN communication network, such as Figure 2-3 As shown, including:
[0041] Step 1: The master controller determines whether the current state of the battery meets the low power monitoring conditions according to preset conditions. If it meets the low power monitoring conditions, it sends a low power monitoring instruction to the slave controller; if it does not meet the low power monitoring conditions, it turns off the slave power supply.
[0042] The master control shutdown decides whether to turn on low power monitoring based on the strategy. Usually the impact of battery power is considered. When the battery power is low, consider turning off the low power monitoring function to save power. When the battery power is sufficient, the master control first turns on the local low power monitoring power supply, and sends the power consumption monitoring command to the slave control through the CAN communication network.
[0043] Step 2: The slave controller configures the low power working mode according to the low power monitoring instruction and sends the configuration result to the master controller.
[0044] Step 3: The master controller determines whether to enter the low power working mode according to the configuration result;
[0045] Step 4: If not, sending a cancel low power consumption entry instruction to the slave controller.
[0046] Step 5: If yes, turn off the slave control power supply, turn on low power consumption monitoring, and perform regular detection of battery status information. When a fault is detected, the slave control generates a wake-up signal to wake up the master control and report the fault information.
[0047] The slave battery status detection unit performs regular detection of the battery status information. These status detections usually include the single cell voltage of the battery box, the single cell temperature, the temperature of the thermal management accessories and the high-voltage interface, the pressure state of the battery pack, the balancing temperature of the battery balancing board, the temperature and humidity environment inside the battery pack box, etc.
[0048] When the status parameter triggers the configured limit threshold of the corresponding working chip, the corresponding battery status acquisition chip in the low power consumption monitoring state generates a continuous interrupt signal.
[0049] Preferably, the interrupt signal is first used to wake up the slave power supply and the slave microprocessor.
[0050] Step 6: The master controller chooses whether to wake up the upper-level device or remotely notify the user based on the preset strategy.
[0051] Furthermore, the above method of waking up the master control is a CAN specific frame wake-up method. If the master control does not have a CAN specific frame wake-up function, an independent hardware wake-up method can also be used to wake up.
[0052] Furthermore, the slave controller configures the low power working mode according to the low power monitoring instruction and sends the configuration result to the master controller, including:
[0053] After receiving the low-power monitoring instruction, the slave controller determines whether the power supply of the slave low-power monitoring is normal. If normal, the low-power monitoring chip is configured to enter the low-power working mode. After the configuration is completed, the configuration result of successful configuration is sent to the master controller; if abnormal, the configuration result of failed configuration is sent to the master controller.
[0054] Furthermore, the master controller determines whether to enter the low power mode according to the configuration results, including:
[0055] Determine whether all slave controller configuration results have been successfully received;
[0056] If yes, the slave power supply is turned off and the system enters low power consumption working mode;
[0057] If not, a cancel instruction is sent to the slave control to cancel entering the low power working mode, and a cancel configuration response message is sent to the master control; the master control reports the fault information and performs fault processing.
[0058] The master controller collects statistics about configuration failures and collects information about successful cancellation of configurations from slave controllers to report faults.
[0059] In another embodiment, after the master controller reports the fault information, the following steps are also included:
[0060] Determine whether fault processing has timed out;
[0061] If the fault processing times out, the magnetic latching power supply is turned off, and then the slave control power supply is turned off to enable shutdown and exit the low power monitoring state;
[0062] If the fault processing has not timed out, continue waiting for processing.
[0063] Specifically, the battery status information is regularly detected. When a fault is detected, the slave controller generates a wake-up signal to wake up the master controller and report the fault information, including:
[0064] Perform regular detection of battery status information, and when a fault is detected, generate an interrupt signal to wake up the slave control power supply, and the slave control power supply wakes up the microprocessor;
[0065] The microprocessor obtains the source of the interrupt signal and the fault register information corresponding to the interrupt signal;
[0066] Confirm the wake-up information based on the interrupt signal source and the fault register information corresponding to the interrupt signal to determine whether the wake-up signal is valid;
[0067] When the wake-up signal is confirmed to be valid, the wake-up signal is sent to wake up the main control and report the fault information; if the wake-up signal is confirmed to be invalid, the number of invalid wake-up signals is recorded. When the number of invalid wake-up signals exceeds the preset threshold, the main control is woken up, a false alarm fault is reported, and the fault register is cleared.
[0068] While waiting for processing, the fault information reported by the slave control is classified. For faults involving safety, they continue to wait for processing. For general faults, the magnetic holding power supply is turned off after timeout, the low-power monitoring is exited to disable reverse wake-up, and the slave control power supply is turned off to save power and prevent the accumulation of erroneous data.
[0069] In an embodiment of the present invention, the reverse wake-up power supply of the slave control is controlled by the master control. In low-power mode, the reverse wake-up power supply can be turned off to prevent frequent wake-up and cause over-discharge of the battery. The module circuit responsible for wake-up has a dual power supply, and its normal operation is not affected when the reverse wake-up power supply is not enabled. In the dual power supply scheme, isolation is achieved by diodes or ideal diodes. The power supply maintenance module of some low-power power supplies uses a magnetic holding relay or an independent system to provide power to reduce system power consumption. The wake-up method of the slave control and the master control is a CAN message specific frame wake-up or a level signal wake-up.
[0070] A battery management system based on a distributed architecture of a CAN communication network is used to implement the above-mentioned reverse wake-up method based on a distributed architecture of a CAN communication network, such as Figure 1 As shown, it includes: a main control unit, several slave control units, a low-voltage power supply, and a power supply maintenance unit; the low-voltage power supply is connected to the main control unit and the slave control unit respectively, the main control unit is connected to the slave control unit, the main control unit is also connected to the power supply maintenance unit, and the power supply maintenance unit is connected to the slave control unit;
[0071] The slave control unit includes several low-power monitoring and acquisition chips, microprocessors, wake-up modules, other chips, and slave control power supply units. Other chips include several ICs that do not require battery status acquisition in low-power mode, communication ICs, etc.
[0072] Specifically, the slave-controlled power supply unit includes a main power supply module and some low-power power supply modules, and the main power supply module and some low-power power supply modules are isolated by diodes; the main power supply module is used for power supply in normal mode, and some low-power power supply modules are used for power supply in low-power working mode.
[0073] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.
[0074] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A reverse wake-up method based on a distributed architecture of a CAN communication network, characterized in that: include: The master control determines whether the current state of the battery meets the low power monitoring condition according to the preset condition, and if it meets the low power monitoring condition, sends a low power monitoring instruction to the slave control; If the low power consumption monitoring condition is not met, the slave control power supply is turned off; The slave controller configures the low power consumption working mode according to the low power consumption monitoring instruction, and sends the configuration result to the master controller; The main control determines whether to enter a low power consumption working mode according to the configuration result; If not, sending a cancel low power consumption entry instruction to the slave controller; If yes, the slave control power supply is turned off, low power consumption monitoring is turned on, and the battery status information is regularly detected. When a fault is detected, the slave control generates a wake-up signal to wake up the master control and report the fault information; The master control selects whether to wake up the upper level device or remotely notify the user according to a preset strategy.
2. According to claim 1, a reverse wake-up method based on a distributed architecture of a CAN communication network is characterized in that: The slave controller configures the low power consumption working mode according to the low power consumption monitoring instruction and sends the configuration result to the master controller, including: After receiving the low-power monitoring instruction, the slave control determines whether the power supply of the slave control low-power monitoring is normal. If normal, the low-power monitoring chip is configured to enter the low-power working mode. After the configuration is completed, the configuration result of successful configuration is sent to the master control; if abnormal, the configuration result of failed configuration is sent to the master control.
3. According to claim 2, a reverse wake-up method based on a distributed architecture of a CAN communication network is characterized in that: The master control determines whether to enter a low power consumption working mode according to the configuration result, including: Determine whether all slave controller configuration results have been successfully received; If yes, the slave power supply is turned off and the system enters low power consumption working mode; If not, a cancel instruction is sent to the slave control to cancel entering the low power consumption working mode, and a cancel configuration response message is sent to the master control; the master control reports the fault information and performs fault processing.
4. According to claim 3, a reverse wake-up method based on a distributed architecture of a CAN communication network is characterized in that: After the master control reports the fault information, it also includes: Determine whether fault processing has timed out; If the fault processing times out, shutting down the slave power supply; If the fault processing has not timed out, continue waiting for processing.
5. The reverse wake-up method based on a distributed architecture of a CAN communication network according to claim 1, characterized in that: The battery status information is regularly detected. When a fault is detected, the slave control generates a wake-up signal to wake up the master control and report the fault information, including: Performing regular detection on the battery status information, and when a fault is detected, generating an interrupt signal to wake up the slave control power supply, and the slave control power supply wakes up the microprocessor; The microprocessor obtains the source of the interrupt signal and the fault register information corresponding to the interrupt signal; Confirm the wake-up information according to the interrupt signal source and the fault register information corresponding to the interrupt signal to determine whether the wake-up signal is valid; When it is confirmed that the wake-up signal is valid, the wake-up signal is sent to wake up the main control and report fault information; if the wake-up signal is confirmed to be invalid, the number of times the wake-up signal is invalid is recorded. When it is confirmed that the number of invalid times of the wake-up signal exceeds a preset threshold, the main control is woken up, a false alarm fault is reported, and the fault register is cleared.
6. A battery management system based on a distributed architecture of a CAN communication network, used to implement a reverse wake-up method based on a distributed architecture of a CAN communication network as described in any one of claims 1 to 5, characterized in that: include: A main control unit, a plurality of slave control units, a low-voltage power supply, and a power supply maintenance unit; the low-voltage power supply is connected to the main control unit and the slave control unit respectively, the main control unit is connected to the slave control unit, the main control unit is also connected to the power supply maintenance unit, and the power supply maintenance unit is connected to the slave control unit; The slave control unit includes a plurality of low-power monitoring and acquisition chips, a microprocessor, a wake-up module, other chips, and a slave control power supply unit.
7. A battery management system based on a distributed architecture of a CAN communication network according to claim 6, characterized in that: The slave-controlled power supply unit includes a main power supply module and a partial low-power power supply module, and the main power supply module and the partial low-power power supply module are isolated by a diode; the main power supply module is used for power supply in normal mode, and the partial low-power power supply module is used for power supply in the low-power working mode.