CN112953773B - Ring daisy chain communication fault processing method of BMS - Google Patents
Ring daisy chain communication fault processing method of BMS Download PDFInfo
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- CN112953773B CN112953773B CN202110207284.1A CN202110207284A CN112953773B CN 112953773 B CN112953773 B CN 112953773B CN 202110207284 A CN202110207284 A CN 202110207284A CN 112953773 B CN112953773 B CN 112953773B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L41/00—Arrangements for maintenance, administration or management of data switching networks, e.g. of packet switching networks
- H04L41/06—Management of faults, events, alarms or notifications
- H04L41/0654—Management of faults, events, alarms or notifications using network fault recovery
- H04L41/0659—Management of faults, events, alarms or notifications using network fault recovery by isolating or reconfiguring faulty entities
- H04L41/0661—Management of faults, events, alarms or notifications using network fault recovery by isolating or reconfiguring faulty entities by reconfiguring faulty entities
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
- H04L12/437—Ring fault isolation or reconfiguration
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L67/00—Network arrangements or protocols for supporting network services or applications
- H04L67/01—Protocols
- H04L67/12—Protocols specially adapted for proprietary or special-purpose networking environments, e.g. medical networks, sensor networks, networks in vehicles or remote metering networks
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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Abstract
The invention discloses a method and a system for processing annular daisy chain communication faults of a BMS (battery management system) and a vehicle, wherein the method comprises the following steps: (S1) the BMS is awakened to be powered on, (S2) whether the accumulated times of the configured CIDs exceeds a first preset time or not is judged, if the accumulated times of the reconfigured CIDs does not exceed the first preset time, the single sampling chips CIDs are configured, whether the configuration of all the single sampling chips CIDs is successful or not is judged, and if the configuration is unsuccessful, the step (S2) is returned to be executed; if the configuration is successful, initializing all the monomer sampling chip registers, judging whether the monomer sampling chip registers are successfully initialized, if so, reading the monomer sampling chip data for the first time, judging whether the reading is normal, if so, periodically reading the monomer sampling chip data, and ending the process. By the fault processing method, faults occurring in the daisy chain communication in the operation process can be processed, the stability and robustness of the daisy chain communication are improved, and the experience of a user is improved.
Description
Technical Field
The invention relates to the technical field of battery management system controllers (BMS), in particular to a method for processing annular daisy chain communication faults of a BMS.
Background
With the development of BMS technologies, it has become a trend that communication between single sampling chips of a BMS is developed from CAN communication to daisy chain communication, daisy chain communication has a great advantage in terms of cost compared to CAN communication, in practical applications, wire harness connection belongs to one of the most unstable systems, because the communication mode of daisy chain communication is cascade communication, and is different from broadcast communication of CAN communication, when a problem occurs in communication of any single sampling chip in daisy chain communication, the problem and information behind the chip cannot be obtained, and if no countermeasure is taken, self-recovery cannot be performed in one power-on cycle, the problem may cause a failure such as power interruption of the entire vehicle.
It is necessary to develop a method for handling a communication failure of a daisy chain of a BMS.
Disclosure of Invention
The invention aims to provide a fault processing method for ring daisy chain communication of a BMS, which can process faults occurring in the operation process of the daisy chain communication and can be completed under the condition that a user does not sense the faults, thereby improving the stability and robustness of the daisy chain communication and improving the experience of the user.
To achieve the above object, the present invention provides a method for handling a ring daisy chain communication failure of a BMS, comprising the steps of:
(S1) the BMS is awakened to be powered on and then performs the step (S2);
(S2) determining whether the accumulated number of times of CID reconfiguration exceeds a first predetermined number of times, if not, going to the step (S3);
(S3) configuring the CIDs, and judging whether the CIDs are successfully configured, if so, turning to the step (S4); otherwise, returning to the step (S2);
(S4) initializing all the monomer sampling chip registers, judging whether the initialization of the monomer sampling chip registers is successful, and if so, turning to the execution step (S5); otherwise, returning to the step (S2);
(S5) reading the data of the single sampling chip for the first time and judging whether the reading is normal, if so, turning to the execution step (S6);
(S6) the single sample chip data is periodically read and the process ends.
Further, if the accumulated number of times of reconfiguring CIDs exceeds a first preset number of times in step (S2), or if the data of the monolithic sampling chip is read for the first time in step (S5), the communication timeout fault counter is incremented by 1, and a monolithic sampling chip communication fault flow is entered, specifically:
(S7) reconfiguring registers of all single sampling chips, judging whether the count of the communication overtime fault counter is greater than a second preset number of times, if so, turning to the execution step (S8); otherwise, go to execute step (S6);
(S8) initializing the bidirectional daisy chain communication configuration, and proceeding to the executing step (S9);
(S9) judging whether all the current monomer sampling chips CID are normal, if so, turning to the execution step (S14); otherwise, go to execute step (S10);
(S10) reinitializing the counter and adding 1, waking up the single sampling chip through the bidirectional daisy chain, resetting the single sampling chip by software, reconfiguring the CID of the single sampling chip, and turning to the execution step (S11);
(S11) judging whether the CID configuration of all the monomer sampling chips is successful, if so, turning to the step (S12); otherwise, go to execute step (S13);
(S12) initializing registers of all single sampling chips, judging whether the initialization of the registers of all the single sampling chips is successful, if so, executing a step (S15); otherwise, go to and carry out the step (S13);
(S13) judging whether the count of the reinitialization counter reaches a third preset number, if so, reporting a communication fault of the single sampling chip, closing a data acquisition task of the single sampling chip, and ending the process; otherwise, go to step (S8);
(S14) clearing the communication timeout fault counter, proceeding to the execution step (S6);
(S15) the reinitialization counter is cleared, the communication timeout failure counter is cleared, and the flow proceeds to the execution step (S6).
Further, in the step (S13), after the communication failure of the single sampling chip is reported, the following steps are further executed: and (5) performing power limiting treatment and high voltage reduction on the BMS.
Further, the value range of the first preset times is 3-10 times.
Further, the value range of the second preset times is 10-30 times.
Further, the value range of the third preset times is 30-50 times.
Further, the periodic reading of the data of the single sampling chip requires the periodic execution of the following steps:
(S61) configuring a single sampling chip register;
(S62) reading the single sample chip data.
The present invention also provides a circular daisy chain communication failure handling system of a BMS, comprising:
the MCU is used for operation processing, operation initialization, single sampling chip configuration, single sampling chip data reading and communication fault diagnosis of the BMS;
the first daisy chain communication conversion chip and the second daisy chain communication conversion chip are used for completing the mutual conversion of the SPI communication and the daisy chain communication protocol;
the n single sampling chips are used for executing data acquisition and message reply according to the instruction of the MCU; the n single sampling chips are respectively a first single sampling chip, a second single sampling chip, an n-1 single sampling chip and an nth single sampling chip;
the MCU, the first daisy chain communication conversion chip, the first monomer sampling chip, the second monomer sampling chip, the (n-1) th monomer sampling chip, the (n) th monomer sampling chip and the second daisy chain communication conversion chip are sequentially connected and connected end to form an annular daisy chain communication circuit, and the annular daisy chain communication circuit can realize bidirectional daisy chain communication and unidirectional daisy chain communication;
the ring daisy chain communication failure handling system of the BMS is capable of performing the steps of the ring daisy chain communication failure handling method of the BMS.
The invention also provides an automobile, which comprises the annular daisy chain communication fault processing system of the BMS.
Compared with the prior art, the invention has the following advantages:
the method for processing the annular daisy chain communication fault of the BMS can solve the fault of the daisy chain communication in the operation process, and can be completed under the condition that a user does not sense the fault, so that the stability and the robustness of the daisy chain communication are improved, and the experience of the user is also improved.
Drawings
Fig. 1 is a flowchart for initializing an abnormal fault handling process for a daisy-chain communication operation process in the ring-shaped daisy-chain communication fault handling method of the BMS of the present invention;
fig. 2 is a flowchart illustrating a single chip communication failure for a daisy-chain communication operation process in the ring-shaped daisy-chain communication failure handling method of the BMS of the present invention;
FIG. 3 is a flow chart of a normal operation mode of daisy chain communication according to the present invention;
fig. 4 is a schematic structural view of a ring daisy chain communication fault handling system of the BMS of the present invention.
In the figure:
1-MCU; 2-a first daisy chain communication conversion chip; 3-a second daisy chain communication conversion chip; 4-single sampling chip.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings.
In the operation process, the daisy chain communication faults include two faults of a CID (Chip Identification) fault of a single sampling Chip, a fault of a register for initializing all single sampling chips and a fault which occurs when the initialization is successful but the data of the single sampling chips are periodically read.
The daisy chain communication exception comprises two exceptions of a CID (CID configuration identifier) exception of the single sampling chip and an exception of a register for initializing all the single sampling chips.
The daisy chain communication fault diagnosis comprises sampling chip CID fault diagnosis and sampling chip register fault diagnosis.
The daisy chain communication fault recovery comprises sampling chip CID fault recovery and sampling chip register fault recovery.
Referring to fig. 1, the present embodiment discloses a method for processing a ring daisy chain communication failure of a BMS, including the steps of:
(S1) the BMS is awakened to be powered on and then performs the step (S2);
(S2) determining whether the accumulated number of times of CID reconfiguration exceeds a first predetermined number of times, if not, going to the step (S3);
(S3) configuring the CIDs, and judging whether the CIDs are successfully configured, if so, turning to the step (S4); otherwise, returning to the step (S2);
(S4) initializing all the monomer sampling chip registers, judging whether the initialization of the monomer sampling chip registers is successful, and if so, turning to the execution step (S5); otherwise, returning to the step (S2); judging whether all the registers are initialized successfully or not means inquiring a write state return value after the register value is written, and if the return fails, the fault occurs, and inquiring the write state return is successful or normal.
(S5) reading the data of the single sampling chip for the first time and judging whether the reading is normal, if so, turning to the execution step (S6); because application layer software needs to be called to start to periodically read the data of the single sampling chip, whether the data of the single sampling chip can be normally read or not needs to be determined before the application layer software is called.
(S6) the single sample chip data is periodically read and the process ends.
In this embodiment, if the accumulated number of times of reconfiguring CIDs exceeds a first preset number of times in step (S2), or if the data of the monolithic sampling chip is read for the first time in step (S5), the communication timeout fault counter is incremented by 1, and a communication fault flow of the monolithic sampling chip is entered, specifically:
(S7) reconfiguring registers of all single sampling chips, judging whether the count of the communication overtime fault counter is greater than a second preset number of times, if so, turning to the execution step (S8); otherwise, go to execute step (S6);
(S8) initializing the bidirectional daisy chain communication configuration, and proceeding to the executing step (S9);
(S9) judging whether all the current single sampling chips CID are normal, if so, turning to the step (S14); otherwise, go to execute step (S10). All the current single sampling chips CID have been configured before, judge whether all the current single sampling chips CID are normal or not, that is, inquire whether the CID value of all the single sampling chips is consistent with the CID configured before, if not, there is a fault; and if the two are consistent, the failure is recovered.
(S10) reinitializing the counter and adding 1, waking up the single sampling chip through the bidirectional daisy chain, resetting the single sampling chip by software, reconfiguring the CID of the single sampling chip, and turning to the execution step (S11); the reinitialization counter is used for counting the times of initializing the bidirectional daisy chain communication configuration in an accumulated mode.
(S11) judging whether the CID configuration of all the monomer sampling chips is successful, if so, turning to the step (S12); otherwise, go to execute step (S13);
(S12) initializing registers of all single sampling chips, judging whether the initialization of the registers of all the single sampling chips is successful, if so, executing a step (S15); otherwise, go to execute step (S13); judging whether all the registers are initialized successfully or not means inquiring a write state return value after the register value is written, if the return fails, a fault occurs, and inquiring the write state return successfully, namely, recovering the fault.
(S13) judging whether the count of the reinitialization counter reaches a third preset number, if so, reporting a communication fault of the single sampling chip, closing a data acquisition task of the single sampling chip, and ending the process; otherwise, go to step (S8);
(S14) clearing the communication timeout fault counter, and proceeding to the execution step (S6);
(S15) the reinitialization counter is cleared, the communication timeout failure counter is cleared, and the flow proceeds to the execution step (S6). The single sampling chip has communication faults, including that the accumulated number of times of reconfiguring CIDs exceeds a first preset number of times or that the data of the single sampling chip is read for the first time, which is a step of processing the single sampling chip having communication faults, as shown in fig. 2. The value range of the first preset times is 3-10 times. Optionally, the first preset number is 3, and in some embodiments, the first preset number may also be other values, which are not limited herein. The second preset number of times ranges from 10 to 30 times. Optionally, the second preset number is 10, and in some embodiments, the second preset number may also be other values, which are not limited herein. The third preset times range from 30 to 50 times. Optionally, the third preset number is 30 times, and in some embodiments, the third preset number may also be other values, which are not limited herein. And the alarm unit sampling chip is about to set a corresponding alarm flag bit when the communication fault is about to occur.
In this embodiment, in step (S13), after a communication failure of the single sampling chip is reported, the following steps are further executed: and (5) performing power limiting treatment and high voltage reduction on the BMS. The application layer performs power limiting treatment on the BMS for 1 minute, and then applies high voltage after 1 minute to prevent overcharge and overdischarge of the battery.
In this embodiment, the periodic reading of the data of the single sampling chip requires the periodic execution of the following steps:
(S61) configuring a single sampling chip register;
(S62) reading the single sample chip data. And then, the task of periodically reading the data of the single sampling chip is continuously completed by sequentially configuring the single sampling chip register and reading the data of the single sampling chip.
Referring to fig. 4, the present embodiment discloses a ring daisy chain communication failure handling system of a BMS, including:
the MCU1 is used for operation processing, operation initialization, single sampling chip configuration, single sampling chip data reading and communication fault diagnosis of the BMS;
the first daisy chain communication conversion chip 2 and the second daisy chain communication conversion chip 3 are used for completing the mutual conversion of the SPI communication and the daisy chain communication protocol. The daisy chain communication conversion chip converts the SPI communication of the MCU into the daisy chain communication which can be identified by the single sampling chip, and converts the daisy chain communication of the single sampling chip into the SPI communication which can be identified by the MCU.
The n single sampling chips 4 are used for executing data acquisition and message reply according to the instruction of the MCU; the n single sampling chips are respectively a first single sampling chip, a second single sampling chip, an n-1 single sampling chip and an nth single sampling chip;
the MCU1, the first daisy chain communication conversion chip 2, the first monomer sampling chip, the second monomer sampling chip, the (n-1) th monomer sampling chip, the nth monomer sampling chip and the second daisy chain communication conversion chip 3 are sequentially connected and connected end to form an annular daisy chain communication circuit, and the annular daisy chain communication circuit can realize bidirectional daisy chain communication and unidirectional daisy chain communication; the ring daisy chain communication failure processing system of the BMS is capable of performing the steps of the ring daisy chain communication failure processing method of the BMS. The ring-shaped daisy chain communication circuit provides a hardware carrier for daisy chain communication. When the one-way daisy chain communication is carried out, the first daisy chain communication conversion chip 2 or the second daisy chain communication conversion chip 3 is started, and the data of the single sampling chip is periodically read through the MCU and the daisy chain communication conversion chip. During bidirectional daisy chain communication, the second daisy chain communication conversion chip 2 and the second daisy chain communication conversion chip 3 are both started, and periodical reading is realized through the MCU and the two daisy chain communication conversion chips to realize periodical reading of the data of the single sampling chips. The bidirectional daisy chain configuration flow is started when the single sampling chip has communication faults after initialization.
Referring to fig. 4, in a normal working mode flow of the daisy chain communication, after the BCU is awakened and powered on, all the single sampling chips CID are configured first, then registers of all the single sampling chips are initialized, and after the initialization is completed and data of the single sampling chips are read successfully for the first time, the data of the single sampling chips are read periodically by starting the application layer. In the normal operation mode of daisy chain communication, the communication mode of the ring-shaped daisy chain communication circuit is unidirectional daisy chain communication.
The embodiment also discloses an automobile, which comprises the annular daisy chain communication fault processing system of the BMS.
The method for processing the annular daisy chain communication fault of the BMS can solve the fault of the daisy chain communication in the operation process, can be completed under the condition that a user does not sense the fault, improves the stability and robustness of the daisy chain communication, and simultaneously improves the experience of the user.
The foregoing detailed description of the preferred embodiments of the invention has been presented. It should be understood that numerous modifications and variations could be devised by those skilled in the art in light of the present teachings without departing from the inventive concepts. Therefore, the technical solutions available to those skilled in the art through logic analysis, reasoning and limited experiments based on the prior art according to the concept of the present invention should be within the scope of protection defined by the claims.
Claims (9)
1. A method for handling a daisy chain communication failure of a BMS, comprising the steps of:
(S1) the BMS is awakened to be powered on and then performs the step (S2);
(S2) judging whether the accumulated times of the configured CID exceeds a first preset time, if so, entering a single sampling chip communication fault flow, and ending the flow; otherwise, go to and carry out the step (S3);
(S3) configuring the CIDs, and judging whether the CIDs are successfully configured, if so, turning to the step (S4); otherwise, returning to the step (S2);
(S4) initializing all the monomer sampling chip registers, judging whether the initialization of the monomer sampling chip registers is successful, and if so, turning to the execution step (S5); otherwise, returning to the step (S2);
(S5) reading the data of the single sampling chip for the first time and judging whether the reading is normal, if so, turning to the execution step (S6); otherwise, entering a single sampling chip communication fault flow, and ending the flow;
(S6) the single sample chip data is periodically read and the process ends.
2. The method for processing the communication fault of the daisy chain of the BMS according to claim 1, wherein the single sampling chip communication fault flow specifically performs the following steps:
(S7) reconfiguring registers of all single sampling chips, judging whether the count of the communication overtime fault counter is greater than a second preset number of times, if so, turning to the execution step (S8); otherwise, go to and carry out the step (S6); wherein, if the accumulated number of times of reconfiguring CID exceeds the first preset number of times in the step (S2), or if the data of the single sampling chip is read for the first time in the step (S5), the communication overtime fault counter is increased by 1;
(S8) initializing the bidirectional daisy chain communication configuration, and proceeding to the executing step (S9);
(S9) judging whether all the current single sampling chips CID are normal, if so, turning to the step (S14); otherwise, go to execute step (S10);
(S10) reinitializing the counter and adding 1, waking up the single sampling chip through the bidirectional daisy chain, resetting the single sampling chip by software, reconfiguring the CID of the single sampling chip, and turning to the execution step (S11);
(S11) judging whether the CID configuration of all the monomer sampling chips is successful, if so, turning to the step (S12); otherwise, go to and carry out the step (S13);
(S12) initializing registers of all single sampling chips, judging whether the initialization of the registers of all the single sampling chips is successful, if so, executing a step (S15); otherwise, go to execute step (S13);
(S13) judging whether the count of the reinitialization counter reaches a third preset number, if so, reporting a communication fault of the single sampling chip, closing a data acquisition task of the single sampling chip, and ending the process; otherwise, go to step (S8);
(S14) clearing the communication timeout fault counter, and proceeding to the execution step (S6);
(S15) the reinitialization counter is cleared, the communication timeout failure counter is cleared, and the flow proceeds to the execution step (S6).
3. The ring daisy chain communication failure handling method of BMS according to claim 2, wherein after the communication failure of the individual sampling chip is reported in the step (S13), the following steps are further performed:
and (5) performing power limiting treatment and high voltage reduction on the BMS.
4. The method of handling the daisy chain communication failure of the BMS according to claim 2 or 3, wherein the first preset number of times ranges from 3 to 10 times.
5. The method of handling the daisy chain communication failure of the BMS of claim 4, wherein the second predetermined number of times ranges from 10 to 30.
6. The method of handling the daisy chain communication failure of the BMS according to claim 5, wherein the third predetermined number of times ranges from 30 to 50 times.
7. The ring daisy chain communication failure handling method of BMS according to claim 1 or 2 or 3 or 5 or 6, wherein the periodic reading of the cell sampling chip data requires periodic execution of the following steps:
(S61) configuring a single sampling chip register;
(S62) reading the single sample chip data.
8. A ring daisy chain communication failure handling system of a BMS, comprising:
the MCU (1) is used for operation processing, operation initialization, single sampling chip configuration, single sampling chip data reading and communication fault diagnosis of the BMS;
the device comprises a first daisy chain communication conversion chip (2) and a second daisy chain communication conversion chip (3) which are used for completing the mutual conversion of SPI communication and daisy chain communication protocols;
the n single sampling chips (4) are used for executing data acquisition and message reply according to the instruction of the MCU; the n single sampling chips are respectively a first single sampling chip, a second single sampling chip, an n-1 single sampling chip and an nth single sampling chip;
the device comprises an MCU (1), a first daisy chain communication conversion chip (2), a first monomer sampling chip, a second monomer sampling chip, an n-1 monomer sampling chip, an n monomer sampling chip and a second daisy chain communication conversion chip (3), wherein the MCU (1), the first daisy chain communication conversion chip (2), the first monomer sampling chip, the second monomer sampling chip, the n-1 monomer sampling chip, the n monomer sampling chip and the second daisy chain communication conversion chip are sequentially connected and connected end to form an annular daisy chain communication circuit, and the annular daisy chain communication circuit can realize bidirectional daisy chain communication and unidirectional daisy chain communication;
the ring daisy chain communication failure handling system of the BMS is capable of performing the steps of the ring daisy chain communication failure handling method of the BMS according to any one of claims 1 to 7.
9. An automobile comprising the daisy chain communication failure handling system of the BMS of claim 8.
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| US9407358B2 (en) * | 2014-08-19 | 2016-08-02 | Ubiquoss Inc. | Optical network terminal with functions of detecting and recovering from failures, blocking supplied power, and storing information, and method of detecting continuous optical output using the same |
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