CN107121923B - Redundant direct-current charging pile BMS circuit and communication method - Google Patents
Redundant direct-current charging pile BMS circuit and communication method Download PDFInfo
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- CN107121923B CN107121923B CN201710522032.1A CN201710522032A CN107121923B CN 107121923 B CN107121923 B CN 107121923B CN 201710522032 A CN201710522032 A CN 201710522032A CN 107121923 B CN107121923 B CN 107121923B
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- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B9/00—Safety arrangements
- G05B9/02—Safety arrangements electric
- G05B9/03—Safety arrangements electric with multiple-channel loop, i.e. redundant control systems
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The invention relates to a redundant direct current charging pile BMS circuit and a communication method, wherein the redundant direct current charging pile BMS circuit comprises a CPU, a display, a background system, a BMS communication circuit 1 and a BMS communication circuit 2, wherein one end of the CPU is connected with the BMS communication circuit 1 and the BMS communication circuit 2, the other end of the CPU is connected with a display screen, an alarm communication line is arranged between the CPU and the display screen and is connected with the background system.
Description
Technical Field
The invention relates to a conductive type off-vehicle electric vehicle charging technology, in particular to a BMS communication system for a direct-current charging pile for charging a new energy electric vehicle, which comprises a circuit and a communication method thereof.
Background
With the development of economic technology in China, energy exhaustion, shortage and ecological environment pollution have led to human beings to feel crisis and face serious challenges, so that the development of green energy is imperative. In particular, in recent years, development of electric vehicles advocates green travel, realizes comprehensive transformation of traffic energy, and has become a trend in the global traffic industry. Under the strong pushing support of the government in China, the electric automobile has achieved a certain result, and is certainly determined by the national institutes as a strategic emerging industry. According to the charging standard issued by the nation, off-vehicle conductive charging is used as a first-choice charging mode of charging of new energy automobiles in China at present, a direct current charging pile is used as one branch of the charging modes, the charging mode has wide application in the market, BMS communication in the direct current charging pile is responsible for controlling the normal running of the whole charging process, and the charging mode has great significance in improving the stability and service life of BMS communication.
The BMS communication refers to communication between an off-board charger of an electric vehicle in a conductive charging mode and the BMS, is communication based on a Controller Area Network (CAN), relevant regulations are made on the communication by national standards, the complexity of a use environment and the instability of a CAN circuit between the off-board charger and the electric vehicle are considered, a method capable of improving the communication stability is found, the application of the off-board charger based on a public transport company is basically all-day non-rotational charging, the defects of the prior art are that only one path of BMS communication circuit is insufficient in anti-interference protection measures of the circuit, and the whole pile is in an uncharged state after the circuit is damaged. How to improve the stability of the communication circuit, further improve the online rate of the off-board charger and reduce the maintenance difficulty.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a redundant direct current charging pile BMS circuit and a communication method, which are suitable for a conduction type charging off-vehicle direct current charger and a direct current charging pile, have high-strength isolation and anti-interference protection, and have a good control strategy.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the utility model provides a direct current fills electric pile BMS circuit based on redundancy, includes CPU, display, backend system, BMS communication circuit 1 and BMS communication circuit 2, wherein CPU one end is connected with BMS communication circuit 1 and BMS communication circuit 2, and the other end is connected with the display screen, is equipped with between CPU and the display screen and reports an emergency and ask for help or increased vigilance communication line and is connected with backend system;
the BMS communication circuit 1 and the BMS communication circuit 2 are respectively composed of a CAN controller (U15, U18), a CAN transceiver (U17, U20), magnetic coupling isolation (U16, U19), common mode inductances (L1, L2), protection circuits (T7, T8), matching resistors (R41, R42, R43, R45), an isolated power supply (U14) and peripheral circuits;
the main circuit is a power-on reset circuit of the CAN controller (U15, U18) which is formed by pins of Pin12, pin13, pin14, pin15 and Pin16 of the CAN controller (U15, U18) respectively connected with CPU through SPI buses (SPI 1_MISO, SPI1_MOSI, SPI 1_SCK), chip select signal lines (SPI 1_CS1, SPI1_CS 2) and control lines (SPI 1_INT1, SPI 1_INT2), and R158, C127, R159 and C137;
r132, Y2, C109, C110, R133, Y3, C111, C112 form a clock circuit of the CAN controller (U15, U18), and the clock circuit is connected with the CAN controller (U15, U18) through pins Pin7 and Pin 8;
pin1, pin2 of CAN controller (U15, U18) are connected to Pin4, pin5 of the magnetic coupling isolation (U16, U19) respectively, used for receiving and dispatching serial data;
the isolated power supply (U14) is connected with VDD through pins of an output end Pin16 of the magnetic coupling isolator (U16, U19), pins Pin13 and Pin12 of the magnetic coupling isolator (U16, U19) are respectively connected to pins Pin1 and Pin4 of the CAN transceiver (U17, U20) for receiving and transmitting serial data, pins Pin7 and Pin6 of the CAN transceiver (U17, U20) are respectively connected to two pins of the common mode inductor (L1 and L2), and the other two pins of the common mode inductor (L1 and L2) are connected to a CAN bus as outputs of a CAN circuit through protection circuits (T7 and T8);
the matching resistors (R42, R43) are connected in parallel with the bus; the matching resistors (R41, R45) are respectively connected with the Pin5 Pin of the CAN transceiver to the matching resistors (R42, R43).
Further, the C140 and the C141 are used as CAN controllers (U15 and U18) to input power supply filter capacitors;
c124, C125, C128, C131 are used as filter capacitors of the magnetic coupling isolation (U16, U19) input power supply;
c129, C130, C132, C133 are connected as filter capacitors of the CAN bus to the output CAN bus of the two CAN transceivers (U17, U20), respectively;
the protection circuits (T7, T8) are connected between the CAN bus and ground.
Further, two paths of automatically switchable BMS communication circuits, namely a BMS communication circuit 1 and a BMS communication circuit 2, are adopted, and after power-on, whether the two paths of BMS communication circuits are normal or not is detected:
1) When both BMS communication circuits are normal, the BMS communication circuit 1 works normally;
2) When any path of BMS communication circuit abnormality is detected, processing the path of abnormality condition and setting the path of state position;
when the BMS communication circuit 1 works normally, whether the two paths of communication circuits are normal or not is detected in real time, and when abnormality of the BMS communication circuit 2 is detected, the BMS communication circuit 1 directly enters an abnormality processing flow of the BMS communication circuit 2, and then works normally;
when the BMS communication circuit 1 works normally, whether two paths of communication circuits are normal or not is detected in real time, when the abnormal operation of the BMS communication circuit 1 in operation is detected, the BMS communication circuit 1 is switched to the BMS communication circuit 2 in real time to work, and meanwhile, the abnormal processing flow is carried out on the BMS communication circuit 1, and the working state of the current BMS communication circuit is detected in real time;
when the BMS communication circuit 2 works normally, the working states of the two paths of BMS communication circuits are detected in real time, and when the abnormal working state of the BMS communication circuit 2 is detected, the abnormal state of the BMS communication circuit 1 is set, shutdown service is carried out, and system maintenance is carried out;
when the BMS communication circuit 2 works normally, the working states of the two paths of BMS communication circuits are detected in real time, when the abnormal work of the BMS communication circuit 2 is detected, the BMS communication circuit 1 is recovered to be normal at the moment, the operation of the BMS communication circuit 1 is automatically switched to, and meanwhile, the abnormal processing flow of the BMS communication circuit 2 is carried out;
and the circulation processing is performed as described above, so that the normal operation of the two paths of BMS communication circuits and the processing under abnormal conditions are ensured.
The beneficial effects of the invention are as follows: the invention provides a redundant direct current charging pile BMS circuit and a communication method, wherein a charging pile is an off-board charger and an off-board direct current charger, an intelligent control strategy is provided with intelligent control and automatic switching of two paths of BMS communication circuits, an isolated power supply, a protection circuit and a filter circuit are adopted, the problem that the off-board charger based on a public transport company basically uses no-rotation charging all the day, the prior art has only one path of BMS communication circuit, the anti-interference protection measures of the circuit are insufficient, and the whole pile is in an uncharged state after the circuit is damaged, and the like. The invention improves the stability of the communication circuit, further improves the online rate of the non-vehicle-mounted charger, reduces the maintenance difficulty and provides convenience for the non-vehicle-mounted charger of the electric automobile.
Drawings
FIG. 1 is a schematic circuit diagram of the present invention;
FIG. 2 is a diagram showing an example of a system CPU connection method according to the present invention;
FIG. 3 is a flow chart of the control strategy of the present invention;
in fig. 3, B1 is a BMS communication circuit 1, and B2 is a BMS communication circuit 2.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the drawings in the embodiments, and it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, are intended to fall within the scope of the present patent protection.
As shown in fig. 1, 2 and 3, the invention relates to a redundancy-based direct current charging pile BMS circuit and a communication method, comprising a CPU, a display, a background system, a BMS communication circuit 1 and a BMS communication circuit 2, wherein one end of the CPU is connected with the BMS communication circuit 1 and the BMS communication circuit 2, the other end of the CPU is connected with a display screen, and an alarm communication line is arranged between the CPU and the display screen and connected with the background system, so as to detect whether the BMS communication circuit 1 and the BMS communication circuit 2 are abnormal.
The BMS communication circuit 1 and the BMS communication circuit 2 are respectively composed of a CAN controller (U15, U18), a CAN transceiver (U17, U20), magnetic coupling isolation (U16, U19), common mode inductances (L1, L2), protection circuits (T7, T8), matching resistors (R41, R42, R43, R45), an isolated power supply (U14) and peripheral circuits;
the main circuit is a power-on reset circuit of the CAN controller (U15, U18) which is formed by pins of Pin12, pin13, pin14, pin15 and Pin16 of the CAN controller (U15, U18) respectively connected with CPU through SPI buses (SPI 1_MISO, SPI1_MOSI, SPI 1_SCK), chip select signal lines (SPI 1_CS1, SPI1_CS 2) and control lines (SPI 1_INT1, SPI 1_INT2), and R158, C127, R159 and C137, and the power-on reset circuit is connected with the input end of the CAN controller through Pin17 and Pin 18;
r132, Y2, C109, C110, R133 and Y3 and a clock circuit forming a CAN controller (U15, U18), wherein the R132, the Y2, the R133 and the Y3 are respectively connected in parallel with the clock circuit, and C109, C110, C111 and C112 are used as filter capacitors of the clock circuit, and the clock circuit is connected with the output end of the CAN controller (U15, U18) through Pin7 and Pin 8;
pin1, pin2 of CAN controller (U15, U18) are connected to Pin4, pin5 of the magnetic coupling isolation (U16, U19) respectively for receiving and dispatching serial data;
the isolation power supply (U14) is connected with VDD through pins Pin16 at the output end of the magnetic coupling isolation (U16, U19), and C100 and C101 are connected in parallel to be used as filter capacitors of the input power supply of the isolation power supply (U14) and connected with Pin1, pin2 of the isolation power supply (U14); c102 and C103 are connected in parallel as filter capacitors of an input power supply of the isolation power supply (U14) and are connected with Pin3 and Pin4 of the isolation power supply (U14);
pin13, pin12 of the magnetic coupling isolation (U16, U19) are connected to Pin1, pin4 Pin of the CAN transceiver (U17, U20) respectively and used for receiving and dispatching serial data, pin7, pin6 Pin of the CAN transceiver (U17, U20) are connected to two pins of the common mode inductance (L1, L2) respectively, the other two pins of the common mode inductance (L1, L2) are connected to the CAN bus as the output of CAN circuit through the protective circuit (T7, T8);
the matching resistors (R42, R43) are connected in parallel with the bus; the matching resistors (R41 and R45) are respectively connected with the Pin5 Pin of the CAN transceiver to be connected between the matching resistors (R42 and R43);
further, the C140 and the C141 are used as CAN controllers (U15 and U18) to input power supply filter capacitors;
c124, C125, C128, C131 are used as filter capacitors of the magnetic coupling isolation (U16, U19) input power supply;
c129, C130, C132, C133 are connected as filter capacitors of the CAN bus to the output CAN bus of the two CAN transceivers (U17, U20), respectively;
one end of the CAN bus is connected with pins Pin6 and Pin7 of the CAN transceivers (U17 and U20), and the other end is connected between the protection circuits (T7 and T8) and the ground.
Further, two paths of automatically switchable BMS communication circuits, namely a BMS communication circuit 1 and a BMS communication circuit 2, are adopted, and after power-on, whether the two paths of BMS communication circuits are normal or not is detected:
1) When both BMS communication circuits are normal, the BMS communication circuit 1 works normally;
2) When any path of BMS communication circuit abnormality is detected, processing the path of abnormality condition and setting the path of state position;
when the BMS communication circuit 1 works normally, whether the two paths of communication circuits are normal or not is detected in real time, and when abnormality of the BMS communication circuit 2 is detected, the BMS communication circuit 1 directly enters an abnormality processing flow of the BMS communication circuit 2, and then works normally;
when the BMS communication circuit 1 works normally, whether two paths of communication circuits are normal or not is detected in real time, when the abnormal operation of the BMS communication circuit 1 in operation is detected, the BMS communication circuit 1 is switched to the BMS communication circuit 2 in real time to work, and meanwhile, the abnormal processing flow is carried out on the BMS communication circuit 1, and the working state of the current BMS communication circuit is detected in real time;
when the BMS communication circuit 2 works normally, the working states of the two paths of BMS communication circuits are detected in real time, and when the abnormal working state of the BMS communication circuit 2 is detected, the abnormal state of the BMS communication circuit 1 is set, shutdown service is carried out, and system maintenance is carried out;
when the BMS communication circuit 2 works normally, the working states of the two paths of BMS communication circuits are detected in real time, when the abnormal work of the BMS communication circuit 2 is detected, the BMS communication circuit 1 is recovered to be normal at the moment, the operation of the BMS communication circuit 1 is automatically switched to, and meanwhile, the abnormal processing flow of the BMS communication circuit 2 is carried out;
and the circulation processing is performed as described above, so that the normal operation of the two paths of BMS communication circuits and the processing under abnormal conditions are ensured.
The CAN controllers (U15 and U18) adopt MCP2515, the magnetic coupling isolation (U16 and U19) adopts ADuM1412ARWZ, the CAN transceivers (U17 and U20) adopt TJA1040T, the inductors (L1 and L2) adopt WCM-3216-222T, the CPU adopts STM32F103ZET6, the protection devices (T7 and T8) adopt SMBJ12CA, and the isolation power supply U14 adopts F1205S-2WR2.
Resistor r158=r159=5.1k, resistor r132=r133=2mΩ, crystal oscillator y2=y3=8 MHz, capacitor c109=c110=c111=c112=20pf, capacitor c129=c130=c132=c133=100 pF, capacitor c124=c125=c127=c128=c131=c137=c140=c141=0.01 uF, capacitor c100=c102=100 nF, capacitor c101=c103=10 uF, resistor r42=r43=60 Ω,
the working principle of the invention is as follows: two paths of BMS communication circuits capable of being automatically switched, namely BMS communication circuit 1 and BMS communication circuit 2, are adopted, and after power-on, whether the two paths of BMS communication circuits are normal or not is detected
1) When both BMS communication circuits are normal, the BMS communication circuit 1 works normally;
2) When any path of BMS communication circuit abnormality is detected, processing the path of abnormality condition and setting the path of state position;
when the BMS communication circuit 1 works normally, whether the two paths of communication circuits are normal or not is detected in real time, and when abnormality of the BMS communication circuit 2 is detected, the BMS communication circuit 1 directly enters an abnormality processing flow of the BMS communication circuit 2, and then works normally;
when the BMS communication circuit 1 works normally, whether two paths of communication circuits are normal or not is detected in real time, when the abnormal operation of the BMS communication circuit 1 in operation is detected, the BMS communication circuit 1 is switched to the BMS communication circuit 2 in real time to work, and meanwhile, the abnormal processing flow is carried out on the BMS communication circuit 1, and the working state of the current BMS communication circuit is detected in real time;
when the BMS communication circuit 2 works normally, the working states of the two paths of BMS communication circuits are detected in real time, and when the abnormal working state of the BMS communication circuit 2 is detected, the abnormal state of the BMS communication circuit 1 is set, shutdown service is carried out, and system maintenance is carried out;
when the BMS communication circuit 2 works normally, the working states of the two paths of BMS communication circuits are detected in real time, when the abnormal work of the BMS communication circuit 2 is detected, the BMS communication circuit 1 is recovered to be normal at the moment, the operation of the BMS communication circuit 1 is automatically switched to, and meanwhile, the abnormal processing flow of the BMS communication circuit 2 is carried out;
and the circulation processing is performed as described above, so that the normal operation of the two paths of BMS communication circuits and the processing under abnormal conditions are ensured.
The invention provides a redundant direct current charging pile BMS circuit and a communication method, wherein a charging pile is an off-board charger and an off-board direct current charger, an intelligent control strategy is provided with intelligent control and automatic switching of two paths of BMS communication circuits, an isolated power supply, a protection circuit and a filter circuit are adopted, the problem that the off-board charger based on a public transport company basically uses no-rotation charging all the day, the prior art has only one path of BMS communication circuit, the anti-interference protection measures of the circuit are insufficient, and the whole pile is in an uncharged state after the circuit is damaged, and the like. The invention improves the stability of the communication circuit, further improves the online rate of the off-board charger, reduces the maintenance difficulty and provides convenience for the off-board charger of the electric automobile.
Claims (3)
1. The utility model provides a direct current fills electric pile BMS circuit based on redundancy, includes CPU, display, backend system, BMS communication circuit 1 and BMS communication circuit 2, wherein CPU one end is connected with BMS communication circuit 1 and BMS communication circuit 2, and the other end is connected with the display screen, is equipped with between CPU and the display screen and reports an emergency and ask for help or increased vigilance communication line and is connected with backend system;
the BMS communication circuit 1 consists of a CAN controller U15, a magnetic coupling isolation U16, a CAN transceiver U17, a common mode inductance L1 and a matching resistor R41;
the BMS communication circuit 2 consists of a CAN controller U18, a magnetic coupling isolation U19, a CAN transceiver U20, a common mode inductance L2 and a matching resistor R45;
the isolated power supply U14 is connected with the Pin16 of the output end Pin16 of the magnetic coupling isolation U16 and the VDD of the Pin16 of the output end Pin16 of the magnetic coupling isolation U19;
the BMS communication circuits 1 and 2 further include protection circuits T7, T8 and matching resistors R42, R43 and peripheral circuits;
(1) the main circuit of the BMS communication circuit 1 is a power-on reset circuit of the CAN controller U15, which is formed by a resistor R158 and a capacitor C127 and is respectively connected to pins Pin15, pin14, pin13, pin16 and Pin12 of the CAN controller U15 through SPI buses SPI1_MISO, SPI1_MOSI, SPI1_SCK, a chip selection signal line SPI1_CS1 and a control line SPI1_INT1, and the power-on reset circuit is connected with the CAN controller U15 through Pin17 and Pin 18;
pin1, pin2 of CAN controller U15 connect to Pin4, pin5 of the magnetic coupling isolation U16 for the receiving and dispatching of serial data;
pin13, pin12 of the magnetic coupling isolation U16 are connected to Pin1, pin4 of the CAN transceiver U17 respectively for receiving and transmitting serial data, pin7, pin6 of the CAN transceiver U17 are connected to two pins of the common mode inductance L1;
the matching resistor R41 and the Pin5 Pin of the CAN transceiver U17 are connected between the matching resistors R42 and R43;
the resistor R132, the crystal oscillator Y2, the capacitor C109 and the capacitor C110 form a clock circuit of the CAN controller U15, and the clock circuit is connected with the CAN controller U15 through pins Pin7 and Pin 8;
(2) the main circuit of the BMS communication circuit 2 is a power-on reset circuit of the CAN controller U18, which is formed by a CPU (Central processing Unit) through SPI buses SPI1_MISO, SPI1_MOSI, SPI1_SCK, a chip selection signal line SPI1_CS2 and a control line SPI1_INT2, wherein the pins of Pin15, pin14, pin13, pin16 and Pin12 of the CAN controller U18 are respectively connected, and the power-on reset circuit is connected with the CAN controller U18 through Pin17 and Pin 18;
pin1, pin2 of CAN controller U18 connect to Pin4, pin5 of the magnetic coupling isolation U19 are used for receiving and dispatching serial data;
pin13, pin12 of the magnetic coupling isolation U19 are connected to Pin1, pin4 of the CAN transceiver U20 respectively for receiving and transmitting serial data, pin7, pin6 of the CAN transceiver U20 are connected to two pins of the common mode inductance L2;
the matching resistor R45 and the Pin5 Pin of the CAN transceiver U20 are connected between the matching resistors R42 and R43;
the resistor R133, the crystal oscillator Y3, the capacitor C111 and the capacitor C112 form a clock circuit of the CAN controller U18, and the clock circuit is connected with the CAN controller U18 through pins Pin7 and Pin 8;
the matching resistors R42 and R43 are connected with the bus in parallel; the other two pins of the common mode inductances L1, L2 are connected to the CAN bus as outputs of the CAN circuit through the protection circuits T7, T8, the protection circuits T7, T8 being connected between the CAN bus and ground.
2. The redundancy-based direct current charging pile BMS circuit of claim 1, wherein the CAN controller U15 input power supply filter capacitance is C140, and the CAN controller U18 input power supply filter capacitance is C141;
the capacitor C124 and the capacitor C128 are used as filter capacitors of the input power supply of the magnetic coupling isolation U16, and the capacitor C125 and the capacitor C131 are used as filter capacitors of the input power supply of the magnetic coupling isolation U19;
the capacitors C129 and C130 are used as filter capacitors of the CAN bus and connected to the output CAN bus of the CAN transceiver U17, and the capacitors C132 and C133 are used as filter capacitors of the CAN bus and connected to the output CAN bus of the CAN transceiver U20.
3. The communication method using the redundancy-based direct current charging pile BMS circuit according to claim 1, wherein two paths of automatically switchable BMS communication circuits, namely BMS communication circuit 1 and BMS communication circuit 2, are adopted, and after power-up, detection is started to determine whether the two paths of BMS communication circuits are normal:
1) When both BMS communication circuits are normal, the BMS communication circuit 1 works normally;
2) When any path of BMS communication circuit abnormality is detected, processing the abnormal condition of the path, and setting the state bit of the path;
when the BMS communication circuit 1 works normally, whether the two paths of communication circuits are normal or not is detected in real time, and when abnormality of the BMS communication circuit 2 is detected, the BMS communication circuit 1 directly enters an abnormality processing flow of the BMS communication circuit 2, and then works normally;
when the BMS communication circuit 1 works normally, whether two paths of communication circuits are normal or not is detected in real time, when the abnormal operation of the BMS communication circuit 1 which is working is detected, the BMS communication circuit 1 is switched to the BMS communication circuit 2 in real time to work, and meanwhile, the abnormal processing flow is carried out on the BMS communication circuit 1, and the working state of the current BMS communication circuit is detected in real time;
when the BMS communication circuit 2 works normally, the working states of the two paths of BMS communication circuits are detected in real time, and when the abnormal working state of the BMS communication circuit 2 is detected, the abnormal state of the BMS communication circuit 1 is set, shutdown service is carried out, and system maintenance is carried out;
when the BMS communication circuit 2 works normally, the working states of the two paths of BMS communication circuits are detected in real time, when the abnormal work of the BMS communication circuit 2 is detected, the BMS communication circuit 1 is recovered to be normal at the moment, the operation of the BMS communication circuit 1 is automatically switched to, and meanwhile, the abnormal processing flow of the BMS communication circuit 2 is carried out;
and the circulation processing is performed as described above, so that the normal operation of the two paths of BMS communication circuits and the processing under abnormal conditions are ensured.
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| 郑敏信 ; 齐铂金 ; 吴红杰.基于双CAN总线的电动汽车电池管理系统.《汽车工程》.2008,(第第9期期),788-791,795. * |
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