CN112162785B

CN112162785B - BMS slave board sleep control method and BMS

Info

Publication number: CN112162785B
Application number: CN202011069617.0A
Authority: CN
Inventors: 李永辉
Original assignee: Svolt Energy Technology Co Ltd
Current assignee: Svolt Energy Technology Co Ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2022-05-17
Anticipated expiration: 2040-09-30
Also published as: CN112162785A

Abstract

The invention relates to the field of battery management, and provides a BMS slave board dormancy control method in an implementation mode, wherein a BMS comprises a BMS main board and a BMS slave board, and the control method comprises the following steps: acquiring a vehicle starting signal, a dormancy control instruction and a current dormancy control state; determining a target sleep control state according to the determined vehicle starting signal, the sleep control instruction and the current sleep control state; entering the target sleep control state from the current sleep control state; and the current dormancy control state and the target dormancy control state both belong to a state set formed by a plurality of preset dormancy control states. A corresponding battery management system BMS is also provided. The method provided by the embodiment of the invention can ensure the reliability of the BMS in the dormancy process and is suitable for battery management.

Description

BMS slave board dormancy control method and BMS

Technical Field

The invention relates to the field of battery management, in particular to a BMS slave board dormancy control method and a BMS.

Background

For an electric automobile, a battery pack is a power source of the whole automobile, and a battery management system directly influences the management and control effects of batteries. The good BMS system can manage the battery more efficiently, and better guarantee the stability and the safety of the battery. The BMS slave board carries important modules for cell voltage, module temperature acquisition and equalization functions, and requires basic parameter acquisition and control over hundreds or even thousands of cells. Therefore, the realization of the slave board sleep function plays a crucial role in maintaining the consistency of the cells in the module and the modules in the whole package. However, each module in the BMS is interconnected with each other, and various interaction relationships exist, so that the sleeping of the slave board needs to be matched with each module. And the sleeping of the slave board must be attached to the sleeping command of the master board, and the sleeping of the BMS master board is attached to the sleeping command of the whole vehicle. Therefore, the slave board sleep can not be designed simply by considering the design, and the sleep strategy with consistent regularity is reasonably combed by integrating various influence factors.

The current implementation method of slave board sleep includes:

the hardware circuit realizes that: the BMS mainboard and the slave board are communicated through a daisy chain, the BMS mainboard sends out a sleep command through SPI communication and transmits the sleep command to the AFE chip on the slave board through the conversion chip and the daisy chain.

And (3) software design implementation: the sleep mode receives the sleep command from the whole vehicle for an ASW state machine model in the BMS software developed based on the AUTOSAR framework at present, the ASW sends the sleep command to each module (AFE, SBC and the like) of the BSW through RTE to enter a sleep control state, after the AFE receives the sleep command, the SBC powers off the MCU, and the BMS enters the sleep control state. The advantages are that: the design method is simple and convenient to implement. The disadvantages are as follows: the sleep command is simply sent to the AFE, and the influence of a complex vehicle environment and other modules on AFE sleep is not considered, so that the slave AFE cannot sleep completely after the sleep command is sent out or the slave AFE cannot be woken up under the condition of waking up after the sleep command is sent out. In the past, the consistency of the battery is poor, the performance of the whole vehicle is affected, and even safety accidents are caused.

From the overall architecture of the BMS, the BMS can be divided into: application Software (commonly known as ASW), middle layer (commonly known as RTE, Runtime Environment), bottom layer Software (commonly known as BSW, Basic Software), and Hardware (commonly known as HW, Hardware).

Disclosure of Invention

In view of the above, the present invention is directed to a BMS slave board sleep control method and a BMS for solving at least the problems of inconsistent sleep and low reliability of a master board and a slave board in the sleep process of the conventional battery management system.

In a first aspect of the present invention, there is provided a BMS slave board sleep control method, the BMS including a BMS master board and a BMS slave board, the control method including: acquiring a vehicle starting signal, a dormancy control instruction and a current dormancy control state; determining a target dormancy control state according to the determined vehicle starting signal, the dormancy control instruction and the current dormancy control state; entering the target sleep control state from the current sleep control state; and the current dormancy control state and the target dormancy control state both belong to a state set formed by a plurality of preset dormancy control states.

Preferably, the sleep control command includes a sleep control command from the BMS and a sleep control command from the network management system.

Preferably, the entering the target sleep control state from the current sleep control state includes: switching the sleep control state by changing the value of the state parameter; and controlling the BMS to be switched to the working state required by the target sleep control state from the slave plate according to the setting of the target sleep control state.

Preferably, the plurality of preset sleep control states in the state set include: no sleep control state: the BMS main board and the BMS slave board are in a normal working state; the first sleep control state: sending a sleep control instruction to a BMS slave plate and allowing the BMS slave plate to be woken up; the second sleep control state: the sleep control instruction from the network management system is not responded any more, and the BMS slave plate is allowed to be awakened; the third sleep control state: timing or counting a whole vehicle starting signal and a sleep control instruction generated by the BMS, and allowing the BMS slave plate to be awakened; and a fourth sleep control state: and sending a power-off instruction to a power supply chip, not allowing to awaken the BMS slave board, and controlling the BMS main board to enter a dormant state.

Preferably, a transition relationship is preset between the sleep control states, and the sleep control states are only switched between the preset sleep control states with the transition relationship.

Preferably, the BMS includes the following modules: CAN transceiver, TCAN and system base chip, the BMS slave board includes analog front end.

Preferably, the control method further includes setting a sleep sequence of the modules in the BM.

Preferably, the control method operates in a basic software layer of the BMS.

Preferably, the control method further includes: providing a state machine within the base software layer, the state machine configured to: storing the state set; storing control logic for determining a target sleep control state according to the determined vehicle starting signal, the sleep control instruction and the current sleep control state; and executing the aforementioned control method.

In a second aspect of the present invention, there is also provided a BMS including a BMS master board and a BMS slave board, the BMS system being configured to perform the aforementioned control method.

In a third aspect of the present invention, there is also provided a computer-readable storage medium having stored therein instructions, which, when run on a computer, cause the computer to execute the foregoing BMS slave board sleep control method.

Through the technical scheme provided by the invention, the method has the following beneficial effects:

1) the influence of the BMS slave board sleep on other modules and the whole vehicle state is fully considered in the design, and after the sleep command is received, the patent is mainly an innovation for increasing the reliability of the command and the sleep consistency between the slave board and the master board,

2) comprehensively considering the whole vehicle environment and the current state and command of the BMS, and reasonably arranging the sleep logic among the modules;

3) after receiving the sleep command, the slave board performs multiple times of confirmation and state judgment, so that the accuracy of realizing the sleep of the slave board is greatly improved, and the master board and the slave board can effectively enter the sleep state together.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

fig. 1 is a schematic diagram illustrating steps of a BMS slave board sleep control method according to an embodiment of the present invention;

FIG. 2 is a diagram illustrating a transition between predefined sleep control states according to an embodiment of the present invention;

fig. 3 is a diagram illustrating implementation steps of a BMS slave sleep control method according to an embodiment of the present invention.

Detailed Description

In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

Fig. 1 is a schematic diagram illustrating steps of a BMS slave board sleep control method according to an embodiment of the present invention, as shown in fig. 1. A BMS slave board sleep control method, wherein the BMS comprises a BMS master board and a BMS slave board, and the control method comprises the following steps:

s11, acquiring a vehicle starting signal, a sleep control instruction and a current sleep control state;

the BMS dormancy needs to consider various factors, such as the overall vehicle environment and various dormancy conditions, and the overall vehicle start signal KL15, the BMS dormancy command, and the network management dormancy condition, that is, after the overall vehicle start signal KL15 is turned off, the slave board starts to sleep after the BMS issues or generates the dormancy command and the network management dormancy condition are both satisfied.

S12, determining a target sleep control state according to the determined vehicle starting signal KL15, the sleep control instruction and the current sleep control state;

as described in the background art, if the sleep command is directly sent, the actual state of the master and slave boards cannot be obtained, and the input signal cannot be verified, which easily results in control errors. Therefore, the embodiment is provided with a plurality of sleep control states, each sleep control state has a specific control strategy, and the control strategies are converted by setting triggering conditions, so that the whole sleep process is stably transferred, and the accuracy of sleep control is realized.

S13, the current sleep control state enters the target sleep control state;

and the current dormancy control state and the target dormancy control state both belong to a state set formed by a plurality of preset dormancy control states. The implementation method provided by the invention can control the BMS master-slave board to be in one of a plurality of preset sleep control states so as to realize progressive sleep control. In the conversion of the sleep control state, a plurality of preset conditions are continuously judged, and the accidental judgment of a single judgment is avoided. When the preset conditions in the BMS master and slave board dormancy process are changed, the dormancy process can be stopped in time, and the protection of the BMS master and slave boards is realized.

The implementation method provided by the invention realizes the dormancy of the master plate and the slave plate of the BMS through the conversion of the gradual multi-level dormancy control process, and the confirmation and the state judgment are carried out for a plurality of times in the process, so that the accuracy of realizing the sleep of the slave plate is greatly improved, and the master plate and the slave plate can effectively enter the sleep state together.

In one embodiment, the sleep control command includes a sleep control command from the BMS and a sleep control command from the network management system. Here, the sleep control commands from the BMS include the sleep control commands forwarded by the BMS and also sleep control commands generated by other control logic in the BMS. The dormancy control instruction of the network management system mainly comprises forwarding or generation from a vehicle internal communication network management system. The user can also increase or decrease the range of the sleep control command to be responded according to the needs of the actual scene.

In one embodiment, said entering said target sleep control state from said current sleep control state comprises: switching the sleep control state by changing the value of the state parameter; and controlling the BMS to be switched to the working state required by the target sleep control state from the slave plate according to the setting of the target sleep control state. When each sleep control state is implemented in the software system, one state parameter can be used to identify the current sleep control state, and if the current sleep control state changes, each sleep control state needs to perform corresponding operations on the BMS motherboard and the BMS slave board. The BMS main board controls the dormancy process of the BMS slave board, so that the BMS main board needs to mark the current dormancy control state and control the BMS slave board to complete corresponding actions.

Fig. 2 is a diagram illustrating a transition relationship between preset sleep control states according to an embodiment of the present invention, as shown in fig. 2. In one embodiment, the plurality of preset sleep control states in the state set includes: no sleep control state: the BMS main board and the BMS slave board are in a normal working state; the first sleep control state: sending a sleep control instruction to a BMS slave plate and allowing the BMS slave plate to be woken up; the second sleep control state: the sleep control instruction from the network management system is not responded any more, and the BMS slave plate is allowed to be awakened; the third sleep control state: timing or counting a whole vehicle starting signal and a sleep control instruction generated by the BMS, and allowing the BMS slave plate to be awakened; and a fourth sleep control state: and sending a power-off instruction to a power supply chip, not allowing to awaken the BMS slave board, and controlling the BMS main board to enter a dormant state. The preset sleep control state includes setting of a judgment condition, determination of a BMS master board state, and determination of a BMS slave board state. The setting of the judgment condition can ensure that the control signal is real and effective during state transition. The BMS slave boards are allowed to be awakened in the sleep control state, and the BMS slave boards can be ensured to be restored to the normal working state in time after errors are found.

Fig. 3 is a diagram illustrating implementation steps of a BMS slave sleep control method according to an embodiment of the present invention, as shown in fig. 3. In this embodiment, a transition relationship is preset between the sleep control states, and the sleep control state is switched only between the preset sleep control states in which the transition relationship exists. The transition relationship depends on the association relationship between the sleep control states, and the switching between the sleep control states can be made to conform to the actual BMS operating condition by setting the transition relationship. Specifically, the initial control state in the BMS is a no sleep control state, i.e., the BMS is in a normal operating state. In this state, when the vehicle start signal KL15, the BMS sleep command, and the network management command are satisfied, the AFE is transitioned to the first sleep control state, and at this time, the sleep command is transmitted to the AFE, and after entering the first sleep control state, the AFE is again transmitted with the sleep command, and at this time, the AFE is switched from the first sleep control state to the second sleep control state, and the slave board can still be woken up in this state. After entering the second sleep control state, the network management state is not judged any more, but the whole vehicle starting signal KL15 and the BMS sleep command are still monitored. If the whole vehicle starting signal KL15 or the BMS sleep command changes, a wake-up command is sent to wake up the AFE to enter a first sleep control state. The purpose of entering the first sleep control state is to enable the slave board in the normal operation state to enter the sleep state again once the entire vehicle wake-up signal KL15 and the BMS sleep command satisfy the sleep condition. And if the sleep condition is met and the mobile terminal is in the second sleep control state, entering a third sleep control state. After entering the third sleep control state, in order to ensure that the KL15 and the sleep command are true, valid, not erroneously sent, or not a random value, the fourth sleep control state is entered after the command is received N consecutive times. And after entering the fourth sleep control state, sending a power-off command to the SBC, and the BMS enters the sleep state without waking up the slave board any more. With this, the switching from the normal operation state to the final sleep state of the BMS is completed.

In one embodiment, the BMS includes the following modules: CAN transceiver, TCAN and system base chip, the BMS slave board includes analog front end. The CAN transceiver comprises chips such as TJA1145, and the TCAN comprises chips such as TCAN4551-Q1 and TCAN 1042V-Q1. The slave plate of BMS is mainly used for gathering the state of battery module, and analog front end AFE belongs to more common slave plate. The configuration of modules such as the CAN transceiver, the TCAN, the system base chip SBC and the like CAN meet the basic function of the BMS. In an actual scene, a user can flexibly configure according to actual needs.

In one embodiment, the control method further includes setting a sleep sequence of the modules in the BMS. Considering the importance of the module function in the BMS and the influence of the sleep state thereof on the entire vehicle, a sleep order needs to be set for a plurality of BMS modules to ensure that the BMS can safely enter the sleep state. In this embodiment, the sleep of the analog front end AFE is placed in the order of higher priority, and finally the sleep of the power chip. The user can rationally plan the sleep sequence according to the kind and characteristics of the BMS module.

In one embodiment, the control method operates in a base software layer of the BMS. From the overall architecture of the BMS, the architecture can be divided into application layer software ASW, middle layer RTE, bottom layer software BSW and hardware HW. The base software BSW is able to directly control and implement chip functions. The control method is written into a basic software layer BSW of the BMS, and the control method can be conveniently realized by using a system interface and a program configuration mode of the layer.

In one embodiment, the control method further comprises: providing a state machine within the base software layer, the state machine configured to: storing the state set; storing control logic for determining a target sleep control state according to the determined vehicle starting signal, the sleep control instruction and the current sleep control state; and executing the aforementioned control method. The state machine in the present embodiment is developed based on BMS Software developed by the AUTOSAR architecture, and runs in base layer Software (also referred to as BSW, Basic Software). The state machine can carry out state transition according to a preset state according to the control signal, and is a control center for coordinating the action of the related signal and finishing specific operation. The present embodiment is represented by a piece of software code, and the software code mainly includes a logic judgment condition, and realizes the switching transition of a plurality of sleep control states through the logic judgment.

In this embodiment, there is also provided a BMS system including a BMS master board and a BMS slave board, the BMS system being configured to perform the aforementioned control method. When the battery management system BMS adopts the control method for dormancy, the reliability and dormancy consistency of the BMS master and slave plates in the dormancy process can be ensured. When the method is implemented, only a piece of code for realizing the functions is added in a software system of the BMS, and no change is needed to be made on hardware.

Aiming at the problem that the existing sleep state is not easy to control, the method provided by the embodiment of the invention not only can effectively realize sleep of the slave board, but also can change the current state of the slave board according to the change of the whole vehicle starting signal KL15 and the sleep command, can effectively realize the state consistency of the slave board and the master board, and is convenient to use in practice.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.

Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.

It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.

The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A BMS slave board dormancy control method is disclosed, the BMS comprises a BMS master board and a BMS slave board, and the control method comprises the following steps:

acquiring a vehicle starting signal, a dormancy control instruction and a current dormancy control state;

determining a target sleep control state according to the vehicle starting signal, the sleep control instruction and the current sleep control state;

entering the target sleep control state from the current sleep control state, including: switching the sleep control state by changing the value of the state parameter; controlling the BMS to be switched to a working state required by the target sleep control state from the slave plate according to the setting of the target sleep control state;

the current dormancy control state and the target dormancy control state both belong to a state set consisting of a plurality of preset dormancy control states; the plurality of preset sleep control states in the state set include:

no sleep control state: the BMS main board and the BMS slave board are in a normal working state;

the first sleep control state: sending a sleep control instruction to the BMS slave board and allowing the BMS slave board to be woken up;

the second sleep control state: no longer responding to the sleep control instruction from the network management system, and allowing the BMS slave plate to be awakened;

the third sleep control state: timing or counting a whole vehicle starting signal and a sleep control instruction generated by the BMS, and allowing the BMS slave plate to be awakened; and

fourth sleep control state: and sending a power-off instruction to a power supply chip, not allowing to awaken the BMS slave board, and controlling the BMS main board to enter a dormant state.

2. The control method according to claim 1, wherein the sleep control command comprises a sleep control command from the BMS and a sleep control command from a network management system.

3. The control method according to claim 1, wherein a transition relationship is preset between the preset sleep control states, and the sleep control states are switched only between the preset sleep control states in which the transition relationship exists.

4. The control method according to any one of claims 1 to 3, wherein the BMS comprises the following modules: CAN transceiver, TCAN and system base chip, the BMS slave board includes analog front end.

5. The control method according to claim 4, further comprising setting a sleep sequence of the modules in the BMS.

6. The control method according to claim 4, wherein the control method is executed in a basic software layer of the BMS.

7. The control method according to claim 6, characterized by further comprising: providing a state machine within the base software layer, the state machine configured to:

including the set of states;

the control logic is used for determining a target sleep control state according to the whole vehicle starting signal, the sleep control instruction and the current sleep control state.

8. A BMS including a BMS motherboard and a BMS slave board, characterized in that the BMS is configured to perform the control method of any one of claims 1 to 7.