CN113715685A - Circuit for controlling actuation state of high-voltage switch, method thereof, management system and vehicle - Google Patents

Circuit for controlling actuation state of high-voltage switch, method thereof, management system and vehicle Download PDF

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Publication number
CN113715685A
CN113715685A CN202010443956.4A CN202010443956A CN113715685A CN 113715685 A CN113715685 A CN 113715685A CN 202010443956 A CN202010443956 A CN 202010443956A CN 113715685 A CN113715685 A CN 113715685A
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China
Prior art keywords
voltage switch
switch
attraction
mcu
reset
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Granted
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CN202010443956.4A
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Chinese (zh)
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CN113715685B (en
Inventor
康斌
倪琰
冯天宇
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BYD Co Ltd
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BYD Co Ltd
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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
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • 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
    • 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
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • 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
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

Abstract

The invention discloses a circuit and a method for controlling a high-voltage switch to keep in an attraction state when an MCU (microprogrammed control Unit) is reset, wherein the circuit comprises a driving circuit, a timer and a control circuit, wherein the driving circuit comprises a driving switch and the timer, and the driving switch is used for responding to an attraction driving instruction of the high-voltage switch to be closed within a timing threshold value of the timer so as to keep the high-voltage switch in attraction; MCU, with drive switch and timer be connected respectively, MCU is used for detecting reset signal, according to the condition of reset signal, before resetting, send high-pressure switch actuation instruction, and control the timer timing, and record and save high-pressure switch and keep the actuation flag bit, and MCU still is used for, after resetting, detect that high-pressure switch keeps the actuation flag bit by the set condition, keep the actuation flag bit by the set condition control high-pressure switch actuation or disconnection according to high-pressure switch. The circuit can control the high-voltage switch to keep the attraction state when the MCU is reset, and cannot cause power-on delay.

Description

Circuit for controlling actuation state of high-voltage switch, method thereof, management system and vehicle
Technical Field
The invention relates to the technical field of vehicles, in particular to a circuit for controlling a high-voltage switch to keep in an attraction state when an MCU (microprogrammed control Unit) is reset, a battery management system, a vehicle, a method for controlling the high-voltage switch to keep in the attraction state when the MCU is reset and a non-temporary computer storage medium.
Background
The electric vehicle monitors physical quantities of the Battery through a Battery Management System (BMS) to ensure safe operation of the Battery. The battery physical quantity detection includes: cell voltage, cell temperature, total battery voltage, and current. When the system requests power-off, the BMS controls a high voltage switch (HV switch) to disconnect the battery from the load/charging device, so as to realize high voltage safety, and a control terminal of the high voltage switch is usually driven by selecting a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) and is controlled by a MCU (micro controller Unit). In the running process of the electric automobile, if the high-voltage switch is suddenly disconnected and when the MCU is unexpectedly reset, the pin of the MCU is recovered to a default state, the driving can be used for controlling the high-voltage switch to be disconnected in a default mode, and therefore user experience can be directly influenced.
In the related art, in order to prevent the high-voltage switch from being unexpectedly opened and enable the MCU to continue to control the high-voltage switch to be closed after recovery, some schemes usually add a capacitor in the MOSFET to achieve delayed opening. However, the capacitor has a limited extension time, and the capacitor keeps the high-voltage switch off, so that when the charge stored in the capacitor is gradually reduced, the voltage is gradually reduced, and the driving capability of the MOSFET is gradually reduced. If the delay time is increased, the capacitance value of the capacitor is required to be higher, the turn-off time of the high-voltage switch is prolonged due to the gradual change process, and the service life of the high-voltage switch is directly threatened when the high-voltage switch is turned off under the load. And although the delayed opening can be realized by using the capacitor, the delayed closing problem can be caused when the capacitor is attracted.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, an object of the present invention is to provide a circuit for controlling a high-voltage switch to maintain an actuation state when an MCU is reset, which can control the high-voltage switch to maintain the actuation state when the MCU is reset, and does not cause a power-on delay.
The second objective of the present invention is to provide a battery management system.
The invention also aims to provide a vehicle.
The fourth objective of the present invention is to provide a method for controlling the high voltage switch to maintain the pull-in state when the MCU is reset.
It is a fifth object of the present invention to provide a non-transitory computer storage medium.
In order to solve the above problem, a circuit for controlling a high-voltage switch to maintain an actuation state when an MCU resets in an embodiment of the first aspect of the present invention includes a driving circuit, where the driving circuit includes a driving switch and a timer, the driving switch is connected to the high-voltage switch, and the driving switch is configured to be closed within a timing threshold of the timer when receiving an actuation instruction of the high-voltage switch, so as to maintain the actuation of the high-voltage switch; MCU, MCU with drive switch with the timer is connected respectively, MCU is used for detecting reset signal, according to reset signal's the condition, before resetting, send high pressure switch actuation instruction, and control the timer timing to and record and store high pressure switch and keep actuation flag bit, and, MCU still is used for, after resetting, detects high pressure switch keeps actuation flag bit by the set condition, according to high pressure switch keeps actuation flag bit by the set condition control high pressure switch actuation or disconnection.
According to the circuit for controlling the high-voltage switch to keep the attraction state during the MCU reset, the high-voltage switch is driven to keep the attraction state based on the time delay function of the timer and the driving switch which are arranged in the driving circuit, when the reset occurs, the high-voltage switch attraction instruction is sent to the driving circuit by the MCU before the reset, the timer starts timing according to the high-voltage switch attraction instruction, so that the high-voltage switch keeps the attraction state within the timing threshold value, the MCU records and stores the high-voltage switch attraction keeping flag bit, and after the reset, the MCU controls the attraction or disconnection of the high-voltage switch according to the condition that the high-voltage switch keeps the attraction flag bit set by detecting the high-voltage switch stored before the reset, thereby when the MCU resets, the high-voltage switch can be controlled to be in the normal state during the abnormal reset or the normal reset according to the condition of the reset signal, the circuit provided by the embodiment of the invention has the advantages that the condition that the high-voltage switch is suddenly disconnected when the MCU is unexpectedly reset is prevented, the user experience is improved, and compared with a mode of adopting a capacitor, the circuit provided by the embodiment of the invention is based on the setting of a timer, and the power-on delay is not caused.
In some embodiments, the reset signal condition comprises: the reset signal is a normal reset signal; the reset signal is an abnormal reset signal.
In some embodiments, the MCU is configured to send the high-voltage switch actuation command to the driving switch when controlling actuation or disconnection of the high-voltage switch according to a condition that the high-voltage switch keeps the actuation flag bit set, so that the driving switch drives the high-voltage switch to actuate, and controls the timer to count time again until the MCU returns to normal, or the MCU does not reset when detecting that the high-voltage switch keeps the actuation flag bit set, and the timer does not count time again, and when the timer exceeds a timing threshold, the timer overflows and sends the high-voltage switch actuation command to the driving switch, so that the driving switch drives the high-voltage switch to disconnect.
In some embodiments, the MCU is configured to, in a booting phase, detect that the high-voltage switch keeps the actuation flag bit set and send the high-voltage switch actuation instruction, and send the high-voltage switch actuation instruction to the driving switch, so that the driving switch drives the high-voltage switch to actuate.
In some embodiments, the MCU is further configured to jump from the boot stage to an application program, detect that the high-voltage switch keeps the actuation flag bit set, and send the actuation instruction of the high-voltage switch to the driving switch again, so that the driving switch drives the high-voltage switch to actuate.
An embodiment of a second aspect of the present invention provides a battery management system, including the circuit for controlling the high-voltage switch to maintain the pull-in state when the MCU is reset according to the above embodiments.
According to the battery management system provided by the embodiment of the invention, the circuit for controlling the high-voltage switch to keep the attraction state when the MCU is reset is adopted, so that the high-voltage switch can be controlled to keep the attraction state when the MCU is reset, and the power-on delay can not be caused.
In a third aspect, embodiments of the present invention provide a vehicle, comprising, a high voltage switch; in the battery management system in the above embodiment, the battery management system is connected to the high-voltage switch, and is configured to control the high-voltage switch to maintain a pull-in state when the MCU is reset.
According to the vehicle provided by the embodiment of the invention, the battery management system provided by the embodiment is adopted to control the state of the high-voltage switch, so that the function of keeping the high-voltage switch in an attraction state can be realized when the MCU is reset, the unexpected disconnection of the high-voltage switch during the running of the vehicle is prevented, and the user experience is improved.
An embodiment of a fourth aspect of the present invention provides a method for controlling a high-voltage switch to maintain an actuation state when an MCU is reset, where the method is used for a circuit including a driving switch, a timer, and an MCU, and the method includes: detecting a reset signal; according to the condition of the reset signal, before resetting, sending a high-voltage switch actuation instruction, controlling the timer to time, and recording and storing a high-voltage switch actuation keeping flag bit; and after resetting, detecting the condition that the high-voltage switch keeps the attraction flag bit set to control the attraction or disconnection of the high-voltage switch.
According to the method for controlling the high-voltage switch to keep the attraction state during the MCU reset, when the reset occurs, before the reset, the MCU sends the attraction instruction of the high-voltage switch to the driving circuit, the timer starts timing according to the attraction instruction of the high-voltage switch, so that the high-voltage switch keeps the attraction state within the timing threshold, the MCU records and stores the attraction keeping flag bit of the high-voltage switch, after the reset, the MCU controls the attraction or disconnection of the high-voltage switch according to the condition that the attraction keeping flag bit of the high-voltage switch is set by detecting the attraction keeping flag bit of the high-voltage switch stored before the reset, thereby controlling the high-voltage switch to be in the normal state during the abnormal reset or the normal reset according to the condition of the reset signal during the reset period of the MCU, preventing the high-voltage switch from being suddenly disconnected during the unexpected reset of the MCU, and improving the user experience, compared with a method adopting a capacitor, the method provided by the embodiment of the invention can not cause power-on delay.
In some embodiments, the conditions according to the reset signal include: the reset signal is a normal reset signal; the reset signal is an abnormal reset signal.
In some embodiments, controlling the high-voltage switch to be switched on or off according to the condition that the high-voltage switch keeps the pull-in flag bit set includes: when the fact that the high-voltage switch keeps the attraction flag bit set is detected, sending the high-voltage switch attraction instruction to the driving switch, enabling the driving switch to drive the high-voltage switch to attract, and controlling the timer to time again until the MCU returns to normal; or detecting that the high-voltage switch keeps the attraction flag bit not set, not controlling the timer to time again, and when the timer exceeds a timing threshold value, the timer overflows and sends an instruction for clearing the attraction of the high-voltage switch to the driving switch so as to enable the driving switch to drive the high-voltage switch to be disconnected.
In some embodiments, detecting that the high-voltage switch keeps the actuation flag bit set, and sending the high-voltage switch actuation command to the driving switch includes: and in the guiding stage, detecting that the high-pressure switch keeps the attraction flag bit set, and sending the attraction instruction of the high-pressure switch to the driving switch so that the driving switch drives the high-pressure switch to attract.
In some embodiments, detecting that the high-voltage switch keeps the pull-in flag bit set, and sending the high-voltage switch pull-in command to the driving switch further includes: and skipping to an application program from the boot stage, detecting that the high-pressure switch keeps the attraction flag bit set, and sending the high-pressure switch attraction instruction to the driving switch again so that the driving switch drives the high-pressure switch to attract.
An embodiment of a fifth aspect of the present invention provides a non-transitory computer storage medium, on which a computer program is stored, where the computer program is executed to implement the method for controlling the high-voltage switch to maintain the pull-in state when the MCU is reset described in the above embodiments.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block diagram of a circuit for controlling a high-voltage switch to maintain a pull-in state when an MCU is reset according to an embodiment of the present invention;
FIG. 2 is a block diagram of a circuit for controlling the high-voltage switch to maintain a pull-in state when the MCU is reset according to another embodiment of the invention;
FIG. 3 is a block diagram of a circuit for controlling the high-voltage switch to maintain a pull-in state when the MCU is reset according to another embodiment of the invention;
FIG. 4 is a block diagram of a circuit for controlling the high-voltage switch to maintain a pull-in state when the MCU is reset according to another embodiment of the invention;
FIG. 5 is a block diagram of a battery management system according to one embodiment of the present invention;
FIG. 6 is a block diagram of a vehicle according to an embodiment of the invention;
fig. 7 is a flowchart of a method for controlling the high-voltage switch to maintain the pull-in state when the MCU is reset according to an embodiment of the present invention.
Reference numerals:
a vehicle 100; a battery management system 10;
the circuit 1 controls the high-voltage switch to keep an actuation state when the MCU is reset; MCU 2; a drive circuit 3; a high-voltage switch 4;
a drive switch 31; a timer 32; a high-side switch 33; a low side switch 34.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
In order to solve the above problems, a circuit for controlling the high-voltage switch to keep in the pull-in state when the MCU is reset according to an embodiment of the present invention is described below with reference to the accompanying drawings, which can control the high-voltage switch to keep in the pull-in state when the MCU is reset without causing a power-on delay.
Fig. 1 is a block diagram of a circuit for controlling a high-voltage switch to maintain a pull-in state when an MCU is reset according to an embodiment of the present invention, and as shown in fig. 1, the circuit 1 according to the embodiment of the present invention includes a driving circuit 3 and an MCU 2.
The driving circuit 3 comprises a driving switch 31 and a timer 32, the driving switch 31 is connected with the high-voltage switch 4, and the driving switch 31 is closed within a timing threshold of the timer 32 when receiving a pull-in instruction of the high-voltage switch, so that the high-voltage switch 4 is kept pulled in.
The MCU2 is respectively connected with the drive switch 31 and the timer 32 and is used for detecting a reset signal, sending a high-voltage switch pull-in instruction before resetting according to the condition of the reset signal, controlling the timer 32 to time, recording and storing the pull-in flag bit of the high-voltage switch, and the MCU is also used for detecting the condition that the pull-in flag bit of the high-voltage switch is set after resetting, and controlling the pull-in or disconnection of the high-voltage switch according to the condition that the pull-in flag bit of the high-voltage switch is set.
In an embodiment, the case of the reset signal includes a normal reset signal and an abnormal reset signal. Specifically, when the MCU2 operates normally, the high/low level signal output from the port of the driving switch 31 is controlled to control the on/off of the high voltage switch 4. When the MCU2 is reset, if it is a normal reset signal, the high voltage switch 4 needs to be controlled to be turned off in a default delay manner; if the reset is abnormal, the high voltage switch 4 needs to be controlled to keep the attraction state, so as to avoid the condition of sudden disconnection, therefore, in the embodiment of the present invention, the MCU2 may determine whether the reset is an abnormal reset signal according to the detected reset signal condition, that is, analyze the cause of the reset, for example, the MCU2 compares the detected reset signal with the previously stored reset signal to determine whether the reset is an abnormal reset signal, for example, the reset signal triggered by an external interrupt or the reset signal caused by a self fault is the reset signal caused by the abnormal cause. And then recording and storing the condition that the high-voltage switch keeps the attraction flag bit set according to the condition of the reset signal, and controlling the attraction or disconnection of the high-voltage switch according to the condition that the high-voltage switch keeps the attraction flag bit set, so that when the MCU is reset, the high-voltage switch can be controlled to be in a normal state during abnormal reset or normal reset according to the condition of the reset signal, the condition that the high-voltage switch is suddenly disconnected during abnormal reset of the MCU is prevented, the user experience degree is improved, and compared with a mode of adopting a capacitor, the circuit provided by the embodiment of the invention is based on the setting of a timer, and the power-on delay is avoided.
Specifically, in response to the reset signal, before resetting, the MCU2 records the reset signal to determine whether the high-voltage switch needs to be kept in actuation and stores the actuation status, i.e., if it is determined as a normal reset signal, the high-voltage switch does not need to be set to keep the actuation flag bit, and after resetting, the MCU2 detects that the high-voltage switch stored before resetting remains in actuation flag bit and is not set, and controls the high-voltage switch 4 to be turned off in a delayed manner; if the abnormal reset signal is determined, the high-voltage switch needs to be set to keep the attraction flag bit, so that after the reset, the MCU2 detects that the high-voltage switch stored before the reset keeps the attraction flag bit set, and the high-voltage switch 4 is controlled to keep attraction. Namely, the embodiment of the invention distinguishes the normal reset signal and the abnormal reset signal according to the attraction flag bit kept by the high-voltage switch, thereby controlling the state of the high-voltage switch.
In addition, the set refers to changing the circuit state of the designated position to a high potential. The fact that the high-voltage switch keeps attracting the flag bit is set in the embodiment of the present invention can be understood that the MCU2 needs to control the high-voltage switch 4 to keep attracting. For example, if the set high-voltage switch keeps the pull-in flag bit to be 1, the MCU2 determines that the reset signal is an abnormal reset signal according to the flag bit 1, and needs to control the high-voltage switch 4 to keep pull-in within a timing threshold; if the high-voltage switch keeps the attraction flag bit to be 0, namely the high-voltage switch keeps the attraction flag bit not to be set, the MCU2 determines that the reset signal is a normal reset signal according to the flag bit 0, and controls the high-voltage switch 4 to be disconnected after the attraction state reaches a timing threshold value.
The circuit 1 of the embodiment of the present invention has the driving switch 31 connected to the control terminal of the high voltage switch 4 to control the high voltage switch 4 to be driven, and the MCU2 controls the driving switch 31 to be driven, and the circuit 1 of the embodiment of the present invention has a certain delay function based on the timer 32 built in the driving circuit 3, which can prevent the high voltage switch 4 from being unexpectedly turned off when being reset, and the MCU is successfully reset within the delay period maintained by the turning-on of the driving switch 31 at the timing threshold of the timer 32 to realize the delayed turning-off of the high voltage switch 4 for a very long time, so that the MCU2 continues to control the turning-on of the high voltage switch 4 after being recovered.
In an embodiment, the high-voltage switch hold-in flag bit may be written to a Non-volatile Memory (NVW) to facilitate querying the flag bit after reset.
In some embodiments, the high voltage switch 4 is turned off by default when the timer 32 times out. The driving switch 31 is connected to the timer 32 and the MCU2, and when the timer 32 reaches a timing threshold, the driving switch 31 can directly detect a signal that the timer 32 times and overflows, so as to turn off the high voltage switch 4. Alternatively, the driving switch 31 may be connected to the MCU2 only, the MCU2 may monitor the timing duration of the timer 32, and the MCU2 may control the driving switch 31 to turn off the high voltage switch when the timing duration of the timer 32 reaches a timing threshold, i.e., the timing is overflowed.
In an embodiment, the timing threshold of the timer may be configured to be 10ms to 300 ms. For example, the timing threshold may be set to 150ms, 200ms or 300ms, the time for holding the high-voltage switch 4 in the delayed manner depends on the timer 32, and the timing threshold of the timer 32 may be configured according to actual requirements through an external circuit, so that by adjusting the timing threshold, the time duration for holding the high-voltage switch 4 in the delayed manner may also be adjusted, the adjustment range is also wider, and the control manner is more flexible and changeable.
The circuit 1 for controlling the high-voltage switch to keep in the attraction state during the MCU reset according to the embodiment of the invention is characterized in that the high-voltage switch 4 is driven to keep in the attraction state based on the time delay function of the timer 32 and the drive switch 31 which are arranged in the drive circuit 3, when the reset occurs, the high-voltage switch attraction instruction is sent to the drive circuit 3 through the MCU2 before the reset, the timer 32 starts timing according to the high-voltage switch attraction instruction, so that the high-voltage switch 4 keeps in the attraction state within a timing threshold value, and the MCU records and stores the high-voltage switch attraction keeping flag bit, and after the reset, the MCU2 controls the high-voltage switch attraction or disconnection by detecting the condition that the high-voltage switch attraction keeping flag bit stored before the reset is set according to the condition that the high-voltage switch attraction keeping flag bit is set, thereby controlling the high-voltage switch to be in the normal state during the abnormal reset or the normal reset according to the condition of the reset signal when the MCU2 is reset, the situation that the high-voltage switch is suddenly disconnected when the MCU is unexpectedly reset is prevented, the user experience is improved, and compared with the mode of adopting a capacitor, the circuit provided by the embodiment of the invention is based on the setting of the timer 32, and the power-on delay is not caused.
In the embodiment, the step of controlling the high-voltage switch to be attracted or disconnected by the MCU according to the condition that the attraction keeping flag bit of the high-voltage switch is set comprises the steps that after the high-voltage switch is reset, if the attraction keeping flag bit of the high-voltage switch is set, the MCU2 sends an attraction instruction of the high-voltage switch to the driving switch 31, so that the driving switch 31 drives the high-voltage switch 4 to be attracted, and the timer 32 is controlled to be reset until the MCU2 returns to be normal; or if the high-voltage switch keeps the attraction flag bit not set, the timer 32 is not controlled to count time again, and when the timer 32 exceeds the timing threshold value, the timer 32 overflows and sends a command for clearing the attraction of the high-voltage switch to the drive switch 31, so that the drive switch 31 drives the high-voltage switch 4 to be disconnected.
That is, if the reset signal is normal, before resetting, the MCU2 sends a high-voltage switch actuation instruction to the driving switch 31, so that the driving switch 31 drives the high-voltage switch 4 to actuate, the timer 32 is controlled to start timing, the high-voltage switch actuation flag bit is recorded and stored, after resetting, the MCU2 detects that the high-voltage switch actuation flag bit stored before resetting is not set by querying, after the timer 32 times out, the MCU2 sends a command to clear the high-voltage switch actuation to the driving switch 31, and the driving switch 31 controls the high-voltage switch 4 to default to delay the opening; if the abnormal reset is realized, before the reset, the MCU2 sends a high-voltage switch attracting instruction and controls the timer 32 to time, and sets the high-voltage switch to keep attracting flag bits, after the reset, the MCU2 detects that the high-voltage switch attracting flag bits stored before the reset are not set through inquiry, and then continues to send the high-voltage switch attracting instruction to enable the high-voltage switch 4 to keep attracting, and controls the timer 32 to time again until the MCU2 returns to a normal state.
In the abnormal resetting process, in response to the high-voltage switch attracting instruction, the timer 32 restarts timing, and the timing threshold of the timer 32 can be adjusted through the outside, when the timer 32 starts timing and reaches the timing threshold, the MCU2 cannot recover to the normal state, and then the high-voltage switch attracting instruction is sent again to restart the timer 32, so that the timer 32 can restart timing, thereby preventing the timer 32 from overflowing to turn off the high-voltage switch, that is, after resetting, the MCU2 can send one or more times of high-voltage switch attracting instructions to control the timer 32 to restart timing, so that the MCU2 can have enough time to recover to the normal state.
In an embodiment, the MCU2 enters the boot phase after reset and then jumps from the boot phase to the application to complete the initialization process, wherein after the MCU2 is reset, the MCU2 inputs a small amount of instructions and data, which are then input to other programs, and the process is called the boot phase.
Therefore, in the circuit 1 according to the embodiment of the present invention, when detecting that the high-voltage switch keep-fit flag is set and sending the high-voltage switch close-fit instruction, the MCU2 is configured to detect that the high-voltage switch keep-fit flag is set and send the high-voltage switch close-fit instruction to the driving switch 31 in the booting stage, so that the driving switch 31 continues to control the high-voltage switch 4 to keep the close-fit state. And jumping to an application program in a boot stage, and when the MCU2 detects that the pull-in flag bit of the high-voltage switch is set, sending a pull-in instruction of the high-voltage switch to the drive switch 31 again so that the drive switch 31 continuously controls the high-voltage switch 4 to keep a pull-in state until the MCU2 completes an initialization process and returns to a normal state.
Therefore, the circuit 1 according to the embodiment of the present invention distinguishes whether the reset signal is abnormal according to the high-voltage switch hold pull-in flag written before the MCU2 is reset, and further executes whether the pull-in state needs to be maintained, and based on the delay function of the timer 32 built in the driving circuit 3, the high-voltage switch pull-in command is sent to the driving circuit 3 before and after the reset, and the timer 32 is controlled to count again when the high-voltage switch pull-in command is sent each time, that is, the timer 32 is automatically cleared, so as to prevent the high-voltage switch 4 from being turned off due to the overflow of the timer 32 before the reset, and ensure that the high-voltage switch 4 continues to maintain the pull-in state, so that the MCU2 has enough time to recover to the normal state, and the function of controlling the high-voltage switch to maintain the pull-in state when the MCU2 is reset is implemented, and the implementation manner is simple and low in cost.
In an embodiment, the driving switch 31 may be a single high-side switch 33, as shown in fig. 2; or a single low-side switch 34, as shown in fig. 3; or both the high side switch 33 and the low side switch 34 may be used as shown in fig. 4.
The circuit connection mode shown in fig. 4 is taken as an example, and the operation process of the circuit for controlling the high-voltage switch to keep the pull-in state when the MCU is reset according to the embodiment of the present invention is described in detail below.
Specifically, in response to the reset signal, before resetting, the MCU2 sends a high-voltage switch actuation command to the high-side switch 33 and the low-side switch 34 through the corresponding ports, and controls the timer 32 to start timing, and the MCU2 analyzes the reset reason according to the reset signal, and determines whether actuation needs to be maintained, and writes the state of actuation maintenance into the NVW, that is, records the state as the high-voltage switch actuation maintenance flag.
Further, after the power on reset, the MCU2 determines whether the power on reset is normal or abnormal according to the stored pull-in flag bit of the high voltage switch, and then executes whether to control the high voltage switch to keep pull-in state. If the power-on is determined to be normally reset, for example, the high-voltage switch keeps the attraction flag bit to be 0, namely the high-voltage switch keeps the attraction flag bit not to be set, and the high-voltage switch 4 is defaulted to be delayed to be disconnected; if the power-on is determined to be abnormal reset, for example, the high-voltage switch keeps the attraction flag bit to be 1, that is, the high-voltage switch keeps the attraction flag bit to be set, the MCU2 continues to send the attraction instruction of the high-voltage switch to keep the high-voltage switch in the attraction state, and the MCU2 can be controlled to count again by sending the attraction instruction of the high-voltage switch once or multiple times to allow the MCU2 to have enough time to recover to the normal state.
For example, after the MCU2 is reset, the MCU2 executes a boot program, and in the stage of the boot program, it queries whether the pull-in flag bit of the high-voltage switch in the NVW is set, and if it is detected that the pull-in flag bit of the high-voltage switch is set, the MCU2 continues to send pull-in commands to the high-side switch 33 and the low-side switch 34 through the corresponding ports, respectively, so that the high-voltage switch 4 continues to maintain the pull-in state, and further, the MCU2 jumps to an application program from the boot program, and queries whether the pull-in flag bit of the high-voltage switch in the NVW is set, and if it is detected that the pull-in flag bit of the high-voltage switch is set, the MCU2 continues to send pull-in commands to the high-side switch 33 and the low-side switch 34 through the corresponding ports, so that the high-voltage switch 4 continues to maintain the pull-in state, and the MCU2 completes an initialization process and enters a normal control flow.
Therefore, the circuit 1 of the embodiment of the present invention controls the high-voltage switch 4 to be turned off in a delayed manner according to the timer 32 built in the driving circuit 3, and when the MCU is abnormally reset, before the MCU is reset, the MCU2 sends a high-voltage switch pull-in command to the driving switch 31 to trigger the high-voltage switch 4 to maintain the pull-in state, and controls the timer 32 to start timing, and sets the high-voltage switch pull-in flag bit, so that after the MCU2 is reset, the MCU2 inquires that the high-voltage switch pull-in flag bit is set, determines that the high-voltage switch pull-in command needs to be continuously sent, i.e. in the boot stage and the application program, respectively communicates with the driving switch 31 once, and clears the timer 32 to count again, so as to prevent the high-voltage switch 4 from being turned off due to overflow of the timer 32 before the MCU2 is restored, and ensure that the high-voltage switch 4 continues to maintain the pull-in state, thereby realizing the function of controlling the high-voltage switch 4 to maintain the pull-in the abnormal reset of the MCU2, the user experience is improved.
In a second aspect of the present invention, as shown in fig. 5, a battery management system 10 includes the circuit 1 for controlling the high-voltage switch to maintain the pull-in state when the MCU is reset, and reference is made to the above for specific operation of the circuit 1 for controlling the high-voltage switch to maintain the pull-in state when the MCU is reset.
According to the battery management system 10 provided by the embodiment of the invention, by adopting the circuit 1 for controlling the high-voltage switch to keep in the attraction state when the MCU is reset, the high-voltage switch can be controlled to keep in the attraction state when the MCU is reset, and the power-on delay can not be caused.
In an embodiment of the third aspect of the present invention, a vehicle 100 includes a high-voltage switch 4 and a battery management system 10, as shown in fig. 6.
The battery management system 10 is connected with the high-voltage switch 4 and used for controlling the high-voltage switch 4 to keep in an attraction state when the MCU is reset, and controlling the high-voltage switch 4 to disconnect the battery and the load when the system 10 is powered off, so that high-voltage safety is realized.
According to the vehicle 100 provided by the embodiment of the invention, the battery management system 10 provided by the embodiment is adopted to control the state of the high-voltage switch 4, so that the function that the high-voltage switch 4 keeps the attraction state can be realized when the MCU is reset, the high-voltage switch 4 is prevented from being unexpectedly disconnected when the vehicle runs, and the user experience is improved.
In a fourth aspect of the present invention, a method for controlling a high-voltage switch to maintain a pull-in state when an MCU is reset is provided, where the method is used for a circuit including a driving switch, a timer, and an MCU and controlling the high-voltage switch to maintain the pull-in state, and as shown in fig. 7, the method in an embodiment of the present invention includes steps S1 to S3.
In step S1, a reset signal is detected.
And step S2, according to the situation of the reset signal, before resetting, sending a high-voltage switch pull-in instruction, controlling a timer to time, and recording and storing a high-voltage switch pull-in keeping flag bit.
In an embodiment, to avoid a situation that a high voltage switch is suddenly turned off due to unexpected reset of an MCU during a vehicle running process, an embodiment of the present invention provides a method for controlling the high voltage switch to maintain a pull-in state when the MCU is reset, wherein a control terminal of the high voltage switch selects a driving circuit to drive, and the MCU controls the driving circuit to perform driving.
In an embodiment, the case of the reset signal includes a normal reset signal and an abnormal reset signal. Responding to the reset signal, before resetting, the MCU judges whether the resetting is normal or not according to the reset signal so as to judge whether the high-voltage switch needs to keep attracting during the resetting, namely, the high-voltage switch keeping attracting flag bit of the resetting is recorded and stored. For example, if the MCU itself has a reset due to an error in operation, or the MCU is triggered to reset due to a loss of external power supply, or the MCU is triggered to reset due to external interference, the reset signal is determined to be an abnormal reset signal.
In the embodiment, the function of controlling the high-voltage switch to be disconnected in a delayed mode when the MCU is reset is realized based on a built-in timer of the driving circuit. Specifically, in response to the reset signal, before resetting, the MCU records the reset signal to determine whether the high-voltage switch needs to be kept in close state and store the state of being kept in close state, i.e. if the high-voltage switch is determined to be normally reset according to the reset signal, the MCU does not need to set the high-voltage switch to keep in close flag, if the high-voltage switch is determined to be abnormally reset according to the reset signal, the MCU needs to set the high-voltage switch to keep in close flag, and simultaneously triggers the high-voltage switch close command, i.e. sends the high-voltage switch close command to the driving switch, and controls the timer to start timing, so that the driving switch is in close state within the timing threshold of the timer, and performs step S3.
And step S3, after resetting, detecting the condition that the high-voltage switch keeps the attraction flag bit set to control the attraction or disconnection of the high-voltage switch.
In an embodiment, after the reset, the MCU determines whether the high-voltage switch needs to keep the pull-in state according to the high-voltage switch keep pull-in flag bit stored before the reset, that is, controls the high-voltage switch to pull in or turn off according to the condition that the high-voltage switch keep pull-in flag bit is set. If the fact that the high-voltage switch keeps the attraction flag bit set is determined, the MCU sends a high-voltage switch attraction instruction to the driving switch to control the high-voltage switch to keep the attraction state continuously, if the fact that the high-voltage switch keeps the attraction flag bit unset is determined, the MCU does not need to send the high-voltage switch attraction instruction to the driving switch, the high-voltage switch is defaulted to be turned off in a delayed mode, therefore, when the MCU resets, the high-voltage switch can be controlled to be in a normal state during abnormal resetting or normal resetting according to the situation of a reset signal, the situation that the high-voltage switch is suddenly turned off when the MCU is abnormally reset is prevented, user experience is improved, and compared with a capacitor mode, the circuit of the embodiment of the invention is based on the setting of a timer, and cannot cause power-on time delay.
According to the method for controlling the high-voltage switch to keep the attraction state during the MCU reset, when the reset occurs, before the reset, the MCU sends the attraction instruction of the high-voltage switch to the driving circuit, the timer starts timing according to the attraction instruction of the high-voltage switch, so that the high-voltage switch keeps the attraction state within the timing threshold, the MCU records and stores the attraction keeping flag bit of the high-voltage switch, after the reset, the MCU controls the attraction or disconnection of the high-voltage switch according to the condition that the attraction keeping flag bit of the high-voltage switch is set by detecting the attraction keeping flag bit of the high-voltage switch stored before the reset, thereby controlling the high-voltage switch to be in the normal state during the abnormal reset or the normal reset according to the condition of the reset signal during the reset period of the MCU, preventing the high-voltage switch from being suddenly disconnected during the unexpected reset of the MCU, and improving the user experience, compared with a method adopting a capacitor, the method provided by the embodiment of the invention can not cause power-on delay.
In some embodiments, the controlling the high-voltage switch to be switched on or off according to the condition that the high-voltage switch keeps the pull-in flag bit set includes: when the fact that the high-voltage switch keeps the attraction flag bit set is detected, the MCU sends a high-voltage switch attraction instruction to the driving switch, so that the driving switch drives the high-voltage switch to attract, and the timer is controlled again to time until the MCU returns to normal; or when the condition that the high-voltage switch keeps the attraction flag bit not set is detected, the timer is not controlled again to time, and when the timer exceeds a timing threshold value, the timer overflows and sends an attraction clearing instruction for the high-voltage switch to the driving switch, so that the driving switch drives the high-voltage switch to be disconnected. Therefore, the method according to the embodiment of the invention distinguishes whether the reset signal is abnormal according to the high-voltage switch holding attraction flag bit written before the MCU is reset, and further executes whether the attraction state needs to be kept, and based on the time delay function of the timer built in the driving circuit, sends the high-voltage switch attraction instruction to the driving circuit before and after the reset respectively, and sets the timer to restart when the high-voltage switch attraction instruction is sent each time, namely, the timer is automatically cleared, so as to prevent the high-voltage switch from being disconnected due to the overflow of the timer before the reset, ensure that the high-voltage switch continues to keep the attraction state, further enable the MCU to have enough time to recover the normal state, realize the function of controlling the high-voltage switch to keep the attraction state when the MCU is reset, and has simple implementation mode and low cost.
In the embodiment, after the reset, the MCU enters the boot program, and then jumps to the application program from the boot program to complete the initialization process, so that in the circuit according to the embodiment of the present invention, when the MCU detects that the pull-in flag bit of the high voltage switch is set, the MCU sends a pull-in command to the driver switch, including: in the guiding stage, when detecting that the high-voltage switch keeps the attraction flag bit set, the MCU sends a high-voltage switch attraction instruction to the driving switch so that the driving switch continuously controls the high-voltage switch to keep in an attraction state.
And jumping to an application program from the boot stage, and sending a high-voltage switch attracting instruction to the driving switch again by the MCU when detecting that the high-voltage switch attracting-keeping flag bit is set so as to enable the driving switch to continuously control the high-voltage switch to keep attracting state.
An embodiment of a fifth aspect of the present invention provides a non-transitory computer storage medium, on which a computer program is stored, where the computer program is executed to implement the method for controlling the high-voltage switch to maintain the pull-in state when the MCU is reset, as provided in the above embodiments.
In the description of this specification, any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing steps of custom logic functions or processes, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present invention may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc. Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (13)

1. The utility model provides a circuit that MCU control high tension switchgear keeps actuation state when resetting which characterized in that, the circuit includes:
the driving circuit comprises a driving switch and a timer, the driving switch is connected with the high-voltage switch, and the driving switch is closed within a timing threshold of the timer when receiving a high-voltage switch actuation instruction so as to keep the high-voltage switch actuated;
the MCU is connected with the driving switch and the timer respectively, and is used for detecting a reset signal, sending a high-voltage switch suction instruction before resetting according to the condition of the reset signal, controlling the timer to time, and recording and storing a high-voltage switch holding suction flag bit;
and the MCU is also used for detecting the condition that the high-voltage switch keeps the attraction flag bit to be set after resetting, and controlling the attraction or disconnection of the high-voltage switch according to the condition that the high-voltage switch keeps the attraction flag bit to be set.
2. The MCU circuit of claim 1, wherein the reset signal comprises:
the reset signal is a normal reset signal;
the reset signal is an abnormal reset signal.
3. The MCU circuit for controlling the high-voltage switch to keep in-suction state during reset according to claim 2, wherein the MCU is used for controlling the high-voltage switch to be in suction or disconnected according to the condition that the high-voltage switch keeps in-suction flag bit set,
when the fact that the high-voltage switch keeps the attraction flag bit set is detected, sending the high-voltage switch attraction instruction to the driving switch, enabling the driving switch to drive the high-voltage switch to attract, and controlling the timer to time again until the MCU returns to normal;
or detecting that the high-voltage switch keeps the attraction flag bit not set, not controlling the timer to time again, and when the timer exceeds a timing threshold value, the timer overflows and sends an instruction for clearing the attraction of the high-voltage switch to the driving switch so as to enable the driving switch to drive the high-voltage switch to be disconnected.
4. The MCU circuit for controlling the high-voltage switch to keep in an attraction state during resetting according to claim 3, wherein the MCU is used for detecting that the high-voltage switch keeps in an attraction flag bit to be set and sending the high-voltage switch attraction driving instruction, and in a guiding stage, detecting that the high-voltage switch keeps in an attraction flag bit to be set and sending the high-voltage switch attraction instruction to the driving switch so that the driving switch drives the high-voltage switch to attract.
5. The MCU circuit for controlling the high-voltage switch to keep in an attraction state during resetting according to claim 4, wherein the MCU is further configured to jump to an application program from the boot stage, detect that the high-voltage switch keeps in an attraction flag bit set, and send the high-voltage switch attraction instruction to the driving switch again, so that the driving switch drives the high-voltage switch to attract.
6. A battery management system, characterized in that, comprises a circuit for controlling the high-voltage switch to keep the pull-in state when the MCU of any one of claims 1-5 is reset.
7. A vehicle, characterized by comprising:
a high voltage switch;
the battery management system of claim 6, the battery management system being coupled to the high voltage switch for controlling the high voltage switch to remain in an engaged state when the MCU is reset.
8. A method for controlling a high-voltage switch to keep an actuation state when an MCU (microprogrammed control Unit) is reset is characterized in that the method is used for a circuit which comprises a driving switch, a timer and the MCU and is used for controlling the high-voltage switch to keep the actuation state, and the method comprises the following steps:
the MCU detects a reset signal;
according to the condition of the reset signal, the MCU sends a high-voltage switch actuation instruction before resetting, controls the timer to time, and records and stores the actuation flag bit of the high-voltage switch;
and after the MCU is reset, detecting the condition that the high-voltage switch keeps the attraction flag bit to be set, and controlling the attraction or disconnection of the high-voltage switch according to the condition that the high-voltage switch keeps the attraction flag bit to be set.
9. The method for controlling the high-voltage switch to keep in the pull-in state when the MCU is reset according to claim 8, wherein the condition according to the reset signal comprises:
the reset signal is a normal reset signal;
the reset signal is an abnormal reset signal.
10. The method for controlling the high-voltage switch to keep in the attraction state when the MCU is reset according to claim 9, wherein controlling the attraction or disconnection of the high-voltage switch according to the condition that the high-voltage switch keeps in the attraction flag bit is set comprises:
when the fact that the high-voltage switch keeps the attraction flag bit set is detected, sending the high-voltage switch attraction instruction to the driving switch, enabling the driving switch to drive the high-voltage switch to attract, and controlling the timer to time again until the MCU returns to normal;
or detecting that the high-voltage switch keeps the attraction flag bit not set, not controlling the timer to time again, and when the timer exceeds a timing threshold value, the timer overflows and sends an instruction for clearing the attraction of the high-voltage switch to the driving switch so as to enable the driving switch to drive the high-voltage switch to be disconnected.
11. The method for controlling the high-voltage switch to keep in the attraction state when the MCU resets according to claim 3, wherein detecting that the high-voltage switch keeps in the attraction flag bit is set, sending the high-voltage switch attraction instruction to the driving switch, comprises:
and in the guiding stage, detecting that the high-pressure switch keeps the attraction flag bit set, and sending the attraction instruction of the high-pressure switch to the driving switch so that the driving switch drives the high-pressure switch to attract.
12. The method for controlling the actuation state of the high-voltage switch during MCU reset according to claim 11, wherein detecting that the actuation flag bit of the high-voltage switch is set, sending the actuation command of the high-voltage switch to the driving switch, further comprises:
and skipping to an application program from the boot stage, detecting that the high-pressure switch keeps the attraction flag bit set, and sending the high-pressure switch attraction instruction to the driving switch again so that the driving switch drives the high-pressure switch to attract.
13. A non-transitory computer storage medium having a computer program stored thereon, wherein the computer program when executed implements the method of any one of claims 8-12 for controlling a high voltage switch to maintain an engaged state when an MCU reset is performed.
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CN110473742A (en) * 2018-05-10 2019-11-19 联合汽车电子有限公司 High-voltage relay control circuit, battery management system and electronic device
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JPH0750123A (en) * 1993-08-04 1995-02-21 Hitachi Air Conditioning & Refrig Co Ltd Sequential switching circuit
CN1828560A (en) * 2005-03-01 2006-09-06 三菱电机株式会社 Vehicle-mounted electronic control apparatus
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