CN113540586A - High-voltage relay control system, high-voltage output control method and automobile - Google Patents
High-voltage relay control system, high-voltage output control method and automobile Download PDFInfo
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- CN113540586A CN113540586A CN202110671568.6A CN202110671568A CN113540586A CN 113540586 A CN113540586 A CN 113540586A CN 202110671568 A CN202110671568 A CN 202110671568A CN 113540586 A CN113540586 A CN 113540586A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M10/4257—Smart batteries, e.g. electronic circuits inside the housing of the cells or batteries
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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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
- 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 high-voltage relay control system, a control method and an automobile, wherein the system comprises: master control unit, drive arrangement and high voltage relay, master control unit includes MCU controller, buffer memory unit and auto-lock unit, is used for receiving feedback signal and the whole car system's of the inside other module inputs of control system high-pressure control instruction, it is right through buffer memory unit high voltage relay controls, just master control unit is in during MCU controller abnormal reset can pass through the lock of auto-lock unit the power supply route of buffer memory unit, through buffer memory unit keeps the control to high voltage relay, drive arrangement is used for the drive the actuation or the disconnection of high voltage relay are with the power supply route of switch-on or disconnection high voltage battery system to the load. The control method keeps the high-voltage relay to be attracted under the condition that the system is abnormally reset, avoids the situation that the vehicle loses power due to sudden high-voltage cutoff, and improves the running safety of the vehicle.
Description
Technical Field
The invention relates to the field of electronic appliances, in particular to a high-voltage relay control system, a high-voltage output control method and an automobile.
Background
The new energy technology is an important direction of current automobile technology development, the safety of an electric automobile is a constant topic and is an important aspect which must be considered when a product is designed, a high-voltage battery provides energy for the electric automobile to drive the electric automobile to run, and if a high-voltage relay is cut off due to abnormal reset of a battery management system MCU (microprogrammed control Unit) of the running automobile, the sudden loss of power of the electric automobile is a serious safety problem.
If the battery management system of the running electric automobile is abnormally reset, the high-voltage relay is suddenly disconnected to cut off the energy source, so that the electric automobile suddenly loses power to decelerate, and a rear-end collision of the automobile can be caused to cause a safety accident in a high-speed running scene.
When the MCU works abnormally, the driving device can clear the control command stored in a self storage unit when receiving a reset signal, the control command is not transmitted to the relay any more, the relay is recovered to a disconnected state, and the whole relay control device does not take measures to prevent the power loss caused by the sudden disconnection of the relay under the abnormal reset, so that the control device and the control method of the high-voltage relay of the battery system need to be correspondingly perfected.
Disclosure of Invention
In view of the above problems of the prior art, an object of the present invention is to provide a high voltage relay control system that keeps a main circuit relay closed to continuously output a high voltage when a battery management system is abnormally reset, thereby avoiding a problem that a vehicle loses power due to sudden high voltage cutoff during driving of the vehicle and improving safety during driving of an electric vehicle.
In order to solve the technical problems, the specific technical scheme of the invention is as follows:
in one aspect, the present invention provides a high voltage relay control system, comprising: the device comprises a main control device, a driving device and a high-voltage relay;
the main control device comprises an MCU (microprogrammed control Unit) controller, a cache unit and a self-locking unit, is used for receiving feedback signals input by other modules in the control system and a high-voltage control instruction of a whole vehicle system, and controls the driving device through the cache unit after being processed by control logic, and can lock a power supply access of the cache unit through the self-locking unit during the abnormal reset period of the MCU controller and keep the control on the driving device through the cache unit;
the driving device is used for receiving a control instruction of the main control device so as to drive the high-voltage relay to be closed or disconnected, and is also provided with a communication path which is connected with the main control MCU and used for feeding back a feedback path of the working state of the high-voltage relay;
the high-voltage relay is arranged on a path of the high-voltage battery system for supplying power to the load and is used for switching on or switching off the power supply path of the high-voltage battery system for supplying power to the load.
Preferably, the high voltage relay includes a first high voltage relay and a second high voltage relay; the first high-voltage relay is arranged on a first passage between a high-voltage output end of the high-voltage battery system and an input end of the load and used for attracting or disconnecting the first passage; and the second high-voltage relay is arranged on a second passage between the output end of the load and the negative electrode of the high-voltage battery system and is used for attracting or disconnecting the second passage.
Further, the MCU controller comprises a detection part and a control part;
the detection part is used for monitoring the working state of the system and controlling the MCU controller to reset when the abnormal working condition is met;
the control part is used for controlling the self-locking unit to lock the power supply path of the cache unit and controlling the high-voltage relay to be closed or disconnected.
Further, the buffer unit includes a displacement buffer disposed between the control unit and the driving device, and the buffer unit can maintain control over the driving device during an abnormal reset of the MCU controller.
Further, the self-locking unit comprises a latch and a pulse input circuit;
the latch is arranged on a power supply path of the cache unit;
the control section triggers locking of the latch through the pulse input circuit.
Further, the pulse input circuit is disposed between the control portion and the latch, and is configured to provide a trigger signal of the latch.
In a second aspect, the present invention further provides a high voltage output control method for a high voltage relay control system, where the control method is based on the above high voltage relay control system, and includes the following steps:
after the MCU controller receives a high-voltage control instruction from a whole vehicle system, judging whether high-voltage output is needed or not;
when a high-voltage output request exists, the MCU controller firstly controls the self-locking unit to lock the power supply to the cache unit, sets a high-voltage output instruction as a hold, and then judges whether the abnormal reset occurs before the system;
when detecting that no abnormal reset request occurs before the system, the main control device executes a power-on process for controlling the attraction of the high-voltage relay;
when the abnormal reset request is detected to occur before the system, the power-on process is skipped, and the main control device directly sets the control instruction of the high-voltage relay to be in a pull-in state.
Further, the main control device executing a power-on process for controlling the actuation of the high-voltage relay may include:
the MCU controller outputs an instruction for controlling the suction of the high-voltage relay to the cache unit;
after receiving the data, the cache unit is processed by internal logic, and then the data is output to a driving device after being stored and converted;
after receiving the instruction output by the cache unit, the driving device controls the output end potential after internal control logic operation so as to drive the high-voltage relay to suck.
Optionally, the judging whether the system has an over-reset before refers to that the MCU controller judges whether an abnormal reset request has occurred according to an abnormal reset flag bit;
before the system is judged whether the abnormal reset occurs or not, the method further comprises the steps of detecting whether the system has an abnormal state or not by the main control device and judging whether the abnormal reset is executed or not, and specifically comprises the following steps:
the MCU controller receives the working state of the high-voltage relay fed back by the driving device;
the MCU controller monitors the value of the abnormal state register of the MCU controller;
the MCU controller judges whether the reset belongs to abnormal reset or not based on the working state of the high-voltage relay and the value of an abnormal state register of the MCU controller:
if yes, judging that the system has an abnormal condition of high-voltage output, setting an abnormal reset flag bit by the MCU controller, and resetting the MCU controller;
if not, judging that the high-voltage output of the system is not abnormal, and setting an abnormal reset flag bit is not needed.
In a third aspect of the invention, an automobile is provided, which comprises any one of the high-voltage relay control systems. The automobile is provided with the high-voltage relay control system provided by the invention, so that the main loop relay can be kept closed under the condition that the battery management system is abnormally reset, the high voltage is continuously output, the vehicle is prevented from losing power due to sudden high voltage cut-off, and the safety of the electric automobile in running is improved.
By adopting the technical scheme, the high-voltage relay control system, the high-voltage output control method and the automobile have the following beneficial effects that:
1. according to the high-voltage relay control system provided by the invention, the self-locking unit and the cache unit are arranged, so that the high-voltage relay control system can continuously work under the condition of abnormal reset of the battery management system, and can keep control over the high-voltage relay.
2. The high-voltage output control method of the high-voltage relay control system can monitor the high-voltage output abnormal state of the system based on the high-voltage relay control system, and keep the high-voltage output by keeping the control on the high-voltage relay after the abnormality occurs, so that the condition that the high voltage is suddenly cut off is avoided.
3. The automobile provided by the invention can keep the relay of the high-voltage output passage closed to continuously output high voltage under the condition of abnormal reset of the battery management system, avoid the situation that the vehicle loses power due to sudden high-voltage cut-off, and improve the safety of the electric automobile in running.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiment or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic diagram of a high voltage relay control system according to the present invention;
FIG. 2 is a schematic diagram of another high voltage relay control system provided by the present invention;
FIG. 3 is a block diagram of a high voltage relay control system provided by the present invention;
FIG. 4 is an example of the self-locking unit of FIG. 3;
FIG. 5 is a flow chart of a high voltage output control method of a high voltage relay control system according to the present invention
In the figure: 1-a main control device, 10-an MCU controller, 11-a self-locking unit, 12-a cache unit, 20-a driving device, 30-a high-voltage relay, 31-a first high-voltage relay and 32-a second high-voltage relay.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or device.
Example 1
The embodiment provides a high-voltage relay control system, which can keep and transmit control on a high-voltage relay by arranging a self-locking unit and a cache unit and continuing to work under the condition of abnormal reset of a battery management system.
Specifically, referring to fig. 1, the present invention provides a high-voltage relay control system, including: the main control device 1, the driving device 20 and the high-voltage relay 30;
And the driving device 20 is connected between the buffer unit 12 and the high-voltage relay 30 and is used for receiving a control instruction of the main control device 1 so as to drive the high-voltage relay 30 to be attracted or disconnected, and the driving device 20 is further provided with a communication path connected with the MCU controller 10, wherein the communication path is used for a feedback path of the working state of the high-voltage relay 30.
And the high-voltage relay 30 is arranged on a path of the high-voltage battery system for supplying power to the load and is used for switching on or off the power supply path of the high-voltage battery system for supplying power to the load.
It should be noted that, in an electric vehicle, the high-voltage control instruction of the entire vehicle system corresponds to a high-voltage power-on instruction and a high-voltage power-off instruction of the entire vehicle in a general case, and when the main control device 1 receives the high-voltage power-on instruction, the high-voltage relay 30 is controlled to be actuated, and simultaneously, the high-voltage output is performed, so that the power-on process is completed; when the main control device 1 receives the high-voltage power-off instruction, the high-voltage relay 30 is controlled to be switched off, and simultaneously, the high voltage is switched off, so that the power-off process is completed.
The high-voltage relay control system provided by the invention is part of an automobile battery management system, and the abnormal resetting of the battery management system refers to the abnormal resetting of the MCU controller 10 in the embodiment; the load can be a motor in an electric automobile and other load devices needing high-voltage output power supply.
In particular, the high-voltage relay control system further comprises an externally accessed power supply unit, the power supply unit provides a power supply for operating the high-voltage relay control system of the embodiment, and the power supply unit keeps supplying power during the operation of the high-voltage relay control system of the embodiment.
With reference to fig. 2, the present embodiment further provides a high-voltage relay control system, which can improve the reliability of the high-voltage battery system to the load path. The method specifically comprises the following steps:
the high-voltage relay 30 includes a first high-voltage relay 31 and a second high-voltage relay 32; the first high-voltage relay 31 is arranged on a first passage between a high-voltage output end of the high-voltage battery system and an input end of the load and used for attracting or breaking the first passage; and the second high-voltage relay 32 is arranged on a second passage between the output end of the load and the negative electrode of the high-voltage battery system and is used for attracting or disconnecting the second passage.
Accordingly, the buffer unit 12 needs to transmit control instructions of the MCU controller 10 to the first high-voltage relay 31 and the second high-voltage relay 32, respectively.
Specifically, the MCU controller 10 may include a detection part and a control part, wherein the detection part is configured to monitor a working state of the system and control the MCU controller 10 to reset when an abnormal working condition is satisfied; the control part is used for controlling the self-locking unit 11 to lock the power supply path of the buffer unit 12 and controlling the high-voltage relay 30 to be closed or opened.
In order to more clearly describe the technical solution of the present invention, the present embodiment further provides a block diagram of a high-voltage relay control system, and the exemplary block diagram is specifically described as follows with reference to fig. 3:
the main control device 1 includes an MCU controller 10, a self-locking unit 11, a buffer unit 12, and a detection circuit and a reset circuit connected to the MCU controller 10. The MCU controller 10 is provided with a detection unit and a control unit, and the buffer unit 12 includes a displacement buffer a and a displacement buffer B. The high-voltage relay 30 includes a first high-voltage relay 31 and a second high-voltage relay 32. The driving unit 20 includes a first high-side controller and a first low-side controller for driving the first high-voltage relay 31, and further includes a second high-side controller and a second low-side controller for driving the second high-voltage relay 32.
The detection part comprises a port P1 and a port P2, the port P1 is connected with an external detection circuit, the output end of the detection circuit is connected with a reset circuit, and the reset circuit is connected with a port P2. The detection circuit detects the value of the status register of the MCU controller 10 through the P1 port, and when it is detected that the MCU controller 10 is in an abnormal operating state, the detection circuit controls the reset circuit to perform a reset operation on the MCU controller 10.
It should be noted that, those skilled in the art should understand that the detection circuit may be a basic working unit integrated inside the MCU controller 10, or may be a basic working unit disposed outside the MCU controller 10. Similarly, the reset circuit may have various configurations, which is not limited by the present invention.
The control part includes a port P0 for controlling the self-locking unit 11, and a control port P3 and a port P4 for controlling the displacement buffer a and the displacement buffer B, respectively. The displacement buffer a and the displacement buffer B play a role of the buffer unit 12, and are used for transmitting a control instruction output by the MCU controller 10 through the control ports P3 and P4 to the driving device 20, and the control instruction is stored and converted by the displacement buffer a and the displacement buffer B and then output to the driving device 20 to drive the high-voltage relay 30 to be switched on or off. The driving device 20 receives the control command transmitted from the buffer unit 12, drives the first high-voltage relay 31 to be switched on or off through the first high-side controller and the first low-side controller, and drives the second high-voltage relay 32 to be switched on or off through the second high-side controller and the second low-side controller.
In particular, the driving device 20 may be an integrated driving chip, and the first and second high-side controllers and the first and second low-side controllers refer to driving units of the driving device 20 that drive the first and second high- voltage relays 31 and 32, respectively.
In some embodiments, the driving device 20 may also include a driving circuit formed by discrete components, and may also perform a function of driving the high-voltage relay to pull in, which is not limited by the present invention.
In particular, in an embodiment of the present invention, the driving device 20 is further provided with a detection circuit for detecting the operating state of the high-voltage relay 30, the detection circuit may be provided with a current detection and/or a voltage detection mechanism, and the detection circuit may obtain the operating state of the high-voltage relay 30 according to a set detection logic. The driving device 20 is connected to the MCU controller 10 through a communication path, and may feed back the operating state of the high voltage relay 30 to the MCU controller 10 through the communication path. The MCU controller 10 may further set processing logic for different operating states based on the operating state of the high voltage relay 30, for example, when the operating state of the high voltage relay 30 is abnormal, the MCU controller 10 may correspondingly perform an abnormal processing task.
To more clearly illustrate the function of the self-locking unit 11 in the present invention, in one embodiment of the present invention, the self-locking unit 11 may be a self-locking circuit shown in fig. 4, including a latch chip and a pulse input circuit; the pulse input circuit comprises a triode Q1, a resistor R0 and a capacitor C0, wherein the resistor R0 and the capacitor C0 form a charging and discharging loop of the pulse input circuit, a latch output end of a self-locking circuit is connected with a power input end of the buffer unit 12, the MCU controller 10 controls the on and off of the triode Q1 through a control signal of P0, the control signal triggers the locking state of the latch after passing through the pulse input circuit, wherein the R1 and the C1 are used as the charging and discharging loop of the latch output end and used for adjusting the latch output end to be in a high-level locking state to provide power input of the buffer unit 12, the latch output end is connected with the input end of the buffer unit 12 through a resistor R2, and the resistor R2 can play a role in reducing interference. When the latch circuit is locked, even if the signal of P0 is lost due to abnormal reset of the MCU controller 10, the latch circuit 11 can always maintain power supply to the buffer unit 12 as long as the external power supply unit continues to provide the V + input.
In an embodiment of the present invention, a pre-charge relay may be further provided, and the pre-charge relay may be connected in parallel with the first high-voltage relay 31, and the pre-charge relay may be provided to effectively ensure stability and safety reliability of high-voltage power-up.
Example 2
The present embodiment provides a high voltage output control method for a high voltage relay control system, wherein fig. 5 is a schematic diagram of the method steps of the present invention, which can be applied to any one of the above high voltage relay control systems, and can control the system to be powered on to output high voltage to provide power for a load; and is able to maintain a high voltage output during an abnormal reset of the MCU controller 10. By the method provided by the embodiment, high-voltage output can be kept even if the control system is reset due to abnormal conditions in the running process of the automobile, and safety accidents caused by the fact that the automobile loses power due to sudden high-voltage cutoff are avoided. The following describes a high-voltage output control method of a high-voltage relay control system with reference to fig. 1 and 2, including:
s1: after the MCU controller 10 receives a high-voltage control instruction from a whole vehicle system, judging whether high-voltage output is needed;
s2: when a high-voltage output request exists, the MCU controller 10 firstly controls the self-locking unit 11 to lock the power supply to the cache unit 12, sets a high-voltage output instruction as a hold, and then judges whether the abnormal reset occurs before the system;
in this embodiment, the condition for determining whether the abnormal reset has occurred before the system may be set to be determined by the MCU controller 10 according to the abnormal reset flag.
For this reason, before determining whether an abnormal reset has occurred before the system, the method may further include the steps of detecting whether the system has an abnormal state by the master control device 1 and determining whether to execute the abnormal reset, and specifically may include:
the MCU controller 10 receives the working state of the high-voltage relay 30 fed back by the driving device 20;
the MCU controller 10 monitors the value of its own abnormal state register;
the MCU controller 10 determines whether it is an abnormal reset based on the operating state of the high voltage relay 30 and the value of its own abnormal state register:
if yes, judging that the system has an abnormal condition of high-voltage output, setting an abnormal reset flag bit by the MCU controller 10, and simultaneously resetting the MCU controller 10;
if not, judging that the high-voltage output of the system is not abnormal, and setting an abnormal reset flag bit is not needed.
Further, the detection of whether the abnormal state exists refers to the detection of whether the MCU controller detects the abnormal state of the system when the high voltage output exists, and the detection condition of the abnormal state may be that when the high voltage relay 30 is detected to be in the attraction state and the MCU controller 10 itself is in the abnormal working state, it is determined that the system has the abnormal state of the high voltage output, and the MCU controller 10 sets the abnormal reset flag bit; otherwise, the system high-voltage output is judged to be abnormal, and an abnormal reset flag bit is not required to be set.
S3: when detecting that the system is not reset before, the main control device 1 executes a power-on process for controlling the attraction of the high-voltage relay 30;
in this embodiment, the performing of the power-on process for controlling the pull-in of the high voltage relay 30 may include:
the main control device 1 outputs an instruction for controlling the suction of the high-voltage relay 30 to the cache unit 12;
after receiving the instruction, the cache unit 12 performs internal logic processing, stores and converts the instruction, and outputs the instruction to the driving device 20;
after receiving the instruction output by the cache unit 12, the driving device 20 controls the output end potential through internal control logic operation, so as to drive the high-voltage relay 30 to be closed.
S4: when detecting that the system has been reset before, the power-on process is skipped, and the main control device 1 directly sets the control instruction for the high-voltage relay 30 to be in the attraction state.
In order to more clearly illustrate the high-voltage output control method of the high-voltage relay control system provided in this embodiment, the following is combined with the system block diagram shown in fig. 3 to specifically illustrate the implementation process of the method, and it should be noted that the following is only an exemplary illustration and does not constitute a limitation to the method of the present invention, and specifically:
the MCU controller 10 receives a high-voltage output instruction of a whole vehicle system;
in the initialization process of the MCU controller 10, the self-locking unit 11 is triggered by a port P0 of the control part to lock the power supply to the cache unit 12, and a high-voltage output instruction is set to be kept;
the driving device 20 feeds back the operating state of the high-voltage relay 30 to the MCU controller 10, and the MCU controller 10 detects the value of its own status register and determines whether reset is required, specifically:
when the high-voltage relay 30 is in a closed state and the state of the MCU controller 10 is abnormal, the MCU controller 10 determines that the system has a high-voltage output abnormal condition, the MCU controller 10 sets an abnormal reset flag and sends a reset request to the detection circuit through the port P1 of the detection part, the detection circuit receives the reset request and controls the reset circuit to output a reset control signal, and the MCU controller 10 starts to reset under the control of the reset circuit; otherwise, the MCU controller 10 determines that the system high voltage output is normal without setting an abnormal reset flag bit;
the MCU controller 10 checks the abnormal reset flag, and determines whether the abnormal reset of the MCU controller 10 occurred during the previous driving:
when the reset flag bit state is reset before, the MCU controller 10 determines that the system is powered on and the high-voltage relay 30 is in the pull-in state, and the main control device 1 skips the system power-on process and directly sets the control command for the high-voltage relay 30 to the pull-in state without performing the power-on process;
when the reset flag bit state is that the reset does not occur before, the MCU controller 10 determines that the system is not powered on, the high voltage relay 30 is in the off state, and the power-on process needs to be executed, and the specific control process is as follows:
1) controlling the second high-voltage relay 32 to close: the MCU controller 10 controls the shift register a and the shift register B through the control ports P3 and P4, respectively, the shift register a receives the command from the port P3, and correspondingly controls the output pin of the second high-side controller of the driving device 20 to be at a high potential; the displacement buffer B receives the instruction output from the port P4, and correspondingly controls the output pin of the second low-side controller of the driving device 20 to be at a low potential, and the low and high potentials drive the second high-voltage relay 32 to pull in;
2) controlling the first high-voltage relay 31 to pull in: the MCU controller 10 respectively controls a displacement buffer A and a displacement buffer B through control ports P3 and P4, the displacement buffer A receives an instruction output by a P3 port and correspondingly controls an output pin of the first high-side controller to be at a high potential; the shift register B receives the instruction output from the P4 port, and correspondingly controls the output pin of the first low-side controller to be at a low potential, so that the first high-voltage relay 31 is pulled in.
It should be noted that, in the power-on process of an embodiment of the present invention, a pre-charging step may also be included, specifically, the main control device 1 controls the second high-voltage relay 32 to be attracted first, and after a certain time delay t1, controls the pre-charging relay to be connected, and after a certain time delay t2, controls the first high-voltage relay 31 to be attracted. For example, t1 and t2 may be set to 50 ms.
The high-voltage output control method can keep the main loop relay closed to continuously output high voltage under the condition that the battery management system is abnormally reset.
Example 3
The embodiment also provides an automobile which comprises the control system of the high-voltage relay, and due to the action of the control system, the problem that the power of the automobile is lost due to sudden high-voltage cut-off in the driving process can be avoided, and the driving safety of the electric automobile is improved.
The embodiment further provides a storage medium, where an executable program of at least one instruction, at least one program, a code set, or an instruction set is stored in the storage medium, and the executable program is loaded and executed by a processor to implement the high-voltage output control method of the high-voltage relay control system described in embodiment 2. The storage medium may be an internal storage unit of the MCU, or may be an external storage chip of the MCU, such as an external Read-only Memory (ROM).
The embodiment further provides a terminal, which includes a processor and a memory, where the memory stores an executable program of at least one instruction or at least one section of program, and the executable program is loaded and executed by the processor to implement the high-voltage output control method of the high-voltage relay control system according to the above method embodiment. The processor can be an MCU chip, and the Memory can be a Read-only Memory (ROM) or an MCU internal storage unit.
Thus, the present embodiment further provides an automobile, which may include the storage medium described above or the terminal described above.
While the invention has been described with reference to specific embodiments, it will be appreciated by those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the invention can be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A high voltage relay control system, comprising: the device comprises a main control device (1), a driving device (20) and a high-voltage relay (30);
the main control device (1) comprises an MCU (microprogrammed control Unit) controller (10), a cache unit (12) and a self-locking unit (11) and is used for receiving feedback signals input by other modules in the control system and high-voltage control instructions of a whole vehicle system, controlling the high-voltage relay (30) through the cache unit (12), and locking a power supply path of the cache unit (12) through the self-locking unit (11) during abnormal reset of the MCU controller (10) by the main control device (1) and keeping control over the high-voltage relay (30) through the cache unit (12);
the driving device (20) is used for receiving a control instruction of the main control device (1) to drive the high-voltage relay (30) to be attracted or disconnected, and is also provided with a communication path, and the communication path is connected with the MCU controller (10) and is used for feeding back a feedback path of the working state of the high-voltage relay (30);
and the high-voltage relay (30) is arranged on a path of the high-voltage battery system for supplying power to the load and is used for switching on or switching off the power supply path of the high-voltage battery system for supplying power to the load.
2. A high voltage relay control system according to claim 1, wherein the high voltage relay (30) comprises a first high voltage relay (31) and a second high voltage relay (32);
the first high-voltage relay (31) is arranged on a first passage between a high-voltage output end of the high-voltage battery system and an input end of the load and used for attracting or breaking the first passage;
and the second high-voltage relay (32) is arranged on a second passage between the output end of the load and the negative electrode of the high-voltage battery system and is used for attracting or disconnecting the second passage.
3. The high-voltage relay control system according to claim 1, wherein the MCU controller (10) comprises a detection part and a control part;
the detection part is used for monitoring the working state of the system and controlling the MCU controller (10) to reset when the abnormal working condition is met;
the control part is used for controlling the self-locking unit (11) to lock the power supply path of the buffer unit (12) and controlling the high-voltage relay (30) to be closed or opened.
4. A high voltage relay control system according to claim 3, wherein the buffer unit (12) comprises a displacement buffer, disposed between the control unit and the driving device, the buffer unit (12) being capable of maintaining control of the driving device (20) during an abnormal reset of the MCU controller (10).
5. A high voltage relay control system according to claim 4, characterized in that the latching unit (11) comprises a latch and a pulse input circuit;
the latch is arranged on a power supply path of the buffer unit (12);
the control section triggers locking of the latch through the pulse input circuit.
6. The high voltage relay control system according to claim 5, wherein the pulse input circuit is disposed between the control portion and the latch for providing a trigger signal of the latch.
7. A high-voltage output control method of a high-voltage relay control system, which is characterized in that the control method is based on the high-voltage relay control system as claimed in any one of claims 1 to 6, the high-voltage control instruction is high-voltage output, and the method comprises the following steps:
after the MCU controller receives a high-voltage output instruction from a whole vehicle system, judging whether high-voltage output is needed or not;
when a high-voltage output request exists, the MCU controller firstly controls the self-locking unit to lock the power supply to the cache unit, sets a high-voltage output instruction as a hold, and then judges whether the abnormal reset occurs before the system;
when the abnormal reset is not detected before the system, the main control device executes a power-on process for controlling the attraction of the high-voltage relay;
and when the abnormal reset of the system is detected before, the power-on process is skipped, and the main control device directly sets the control instruction of the high-voltage relay to be in a pull-in state.
8. The high-voltage output control method of the high-voltage relay control system according to claim 7, wherein the main control device performs a power-on process for controlling actuation of the high-voltage relay, and the method comprises:
the main control device outputs an instruction for controlling the suction of the high-voltage relay to the cache unit;
after receiving the data, the cache unit is processed by internal logic, and then the data is output to a driving device after being stored and converted;
after receiving the instruction output by the cache unit, the driving device controls the output end potential after internal control logic operation so as to drive the high-voltage relay to suck.
9. The high-voltage output control method of the high-voltage relay control system according to claim 7, wherein the judging whether the abnormal reset occurs before the system refers to that the MCU controller judges whether the abnormal reset occurs according to an abnormal reset flag;
before the system is judged whether the abnormal reset occurs or not, the method further comprises the steps of detecting whether the system has an abnormal state or not by the main control device and judging whether the abnormal reset is executed or not, and specifically comprises the following steps:
the MCU controller receives the working state of the high-voltage relay fed back by the driving device;
the MCU controller monitors the value of the abnormal state register of the MCU controller;
the MCU controller judges whether the reset belongs to abnormal reset or not based on the working state of the high-voltage relay and the value of an abnormal state register of the MCU controller:
if yes, judging that the system has an abnormal condition of high-voltage output, setting an abnormal reset flag bit by the MCU controller, and resetting the MCU controller;
if not, judging that the high-voltage output of the system is not abnormal, and setting an abnormal reset flag bit is not needed.
10. An automobile, characterized by comprising the high-voltage relay control system as claimed in any one of claims 1 to 6.
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| CN202110671568.6A CN113540586A (en) | 2021-06-17 | 2021-06-17 | High-voltage relay control system, high-voltage output control method and automobile |
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| CN114211963A (en) * | 2021-12-14 | 2022-03-22 | 华人运通(江苏)技术有限公司 | Relay control device, battery management system and electric automobile |
| CN114865114A (en) * | 2022-04-20 | 2022-08-05 | 广东汇天航空航天科技有限公司 | Battery management system and control method thereof |
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Application publication date: 20211022 |