CN113715685B

CN113715685B - Circuit for controlling actuation state of high-voltage switch, method and management system thereof and vehicle

Info

Publication number: CN113715685B
Application number: CN202010443956.4A
Authority: CN
Inventors: 康斌; 倪琰; 冯天宇
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2020-05-22
Filing date: 2020-05-22
Publication date: 2023-05-19
Anticipated expiration: 2040-05-22
Also published as: CN113715685A

Abstract

The invention discloses a circuit for controlling a high-voltage switch to keep a suction state and a method thereof when an MCU (micro control Unit) is reset, wherein the circuit comprises a driving circuit, a control circuit and a control circuit, wherein the driving circuit comprises a driving switch and a timer, and the driving switch is used for responding to a suction driving instruction of the high-voltage switch to be closed in a timing threshold value of the timer so as to keep the suction state of the high-voltage switch; the MCU is respectively connected with the driving switch and the timer, and is used for detecting a reset signal, sending a high-voltage switch actuation command before resetting according to the condition of the reset signal, controlling the timer to time, recording and storing the high-voltage switch actuation maintaining zone bit, and controlling the high-voltage switch to actuate or to be disconnected according to the condition that the high-voltage switch actuation maintaining zone bit is set after the reset. The circuit can control the high-voltage switch to keep the attraction state when the MCU is reset, and power-on delay is not caused.

Description

Circuit for controlling actuation state of high-voltage switch, method and management system thereof 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 a suction state during MCU reset, a battery management system, a method for controlling the high-voltage switch to keep the suction state during vehicle and MCU reset, and a non-temporary computer storage medium.

Background

The electric vehicle monitors the physical quantity of the battery through a battery management system (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 is powered down, the BMS controls the high voltage switch (HV switch) to disconnect the battery from the load/charging device, so as to realize high voltage safety, and the control terminal of the high voltage switch typically selects a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) to drive, and the MCU (micro control unit, microcontroller Unit) controls the MOSFET to drive. In the running process of the electric automobile, if the high-voltage switch is suddenly disconnected, and when the MCU is in unexpected reset, the MCU pin is restored to a default state, and the drive can default control the disconnection of the high-voltage switch, so that the user experience can be directly influenced.

In the related art, in order to prevent the high-voltage switch from being unexpectedly opened, the MCU can continuously control the high-voltage switch to be closed after recovering, and some schemes generally increase a capacitor in the MOSFET to realize delayed opening. However, the capacitor has a limited extension time, the high voltage switch is maintained to be turned off by the capacitor, and 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 of the capacitor is required to be high, 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 load is turned off. And the capacitor can realize delayed opening, but the problem of delayed closing is caused when the capacitor is sucked.

Disclosure of Invention

The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, an object of the present invention is to provide a circuit for controlling a high-voltage switch to maintain an on state when an MCU is reset, which can achieve the effect of controlling the high-voltage switch to maintain an on state when the MCU is reset, and does not cause power-on delay.

The second objective of the present invention is to provide a battery management system.

A third object of the present invention is to provide a vehicle.

The fourth purpose of the invention is to provide a method for controlling the attraction state of the high-voltage switch during MCU reset.

The fifth object of the present invention is to provide a non-transitory computer storage medium.

In order to solve the above problem, a circuit for controlling a high-voltage switch to keep a suction state when an MCU in an embodiment of a first aspect of the present invention resets 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 used to close within a timing threshold of the timer when receiving a suction instruction of the high-voltage switch, so that the high-voltage switch keeps suction; the MCU is respectively connected with the driving switch and the timer, and is used for detecting a reset signal, sending a high-voltage switch actuation instruction before resetting according to the condition of the reset signal, controlling the timer to count time and recording and storing a high-voltage switch actuation-keeping flag bit, and further used for detecting the condition that the high-voltage switch actuation-keeping flag bit is set after resetting and controlling the high-voltage switch actuation or disconnection according to the condition that the high-voltage switch actuation-keeping flag bit is set.

According to the circuit for controlling the high-voltage switch to keep the attraction state during MCU reset, the high-voltage switch attraction instruction is sent to the driving circuit through the MCU before the MCU is reset based on the delay function of the built-in timer in the driving circuit and the driving switch, the timer starts timing according to the high-voltage switch attraction instruction to enable the high-voltage switch to keep the attraction state in a timing threshold value, the MCU records and stores the high-voltage switch attraction flag bit, and after reset, the MCU controls the high-voltage switch to be attracted or disconnected according to the situation that the high-voltage switch attraction flag bit is set after detecting the high-voltage switch attraction flag bit stored before reset, so that the MCU is in a normal state according to the situation of a reset signal during MCU reset, the high-voltage switch is controlled to be suddenly disconnected during abnormal reset or normal reset, the MCU is prevented from suddenly disconnecting during unexpected reset, and compared with a capacitor mode, the circuit of the embodiment of the invention is based on the setting of the timer, and does not cause power-on delay.

In some embodiments, the reset signal 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 the high voltage switch to be actuated or disconnected according to the state that the high voltage switch actuation flag is set, so that the driving switch drives the high voltage switch to actuate, and re-control the timer to count time until the MCU is restored to normal, or, when detecting that the high voltage switch actuation flag is not set, not re-control the timer to count time, and when the timer counts time to exceed a timing threshold, the timer overflows and sends a clear high voltage switch actuation command to the driving switch to drive the high voltage switch to be disconnected.

In some embodiments, the MCU is configured to, when detecting that the high voltage switch keep-on flag is set and sending the high voltage switch actuation command, detect that the high voltage switch keep-on flag is set in a guiding stage, send the high voltage switch actuation command 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 skip from the boot stage to an application program, detect that the high voltage switch keeps the actuation flag bit set, and send the high voltage switch actuation command 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 a circuit for controlling a high-voltage switch to maintain an on state when the MCU in the above embodiment is reset.

According to the battery management system provided by the embodiment of the invention, the circuit for controlling the high-voltage switch to keep the on state during the MCU reset is adopted, so that the state for controlling the high-voltage switch to keep on during the MCU reset can be realized, and the power-on delay is not caused.

An embodiment of a third aspect of the present invention provides a vehicle including a high voltage switch; the battery management system of the above embodiment is connected to the high-voltage switch, and is used for controlling the high-voltage switch to keep a suction state when the MCU resets.

According to the vehicle provided by the embodiment of the invention, the state of the high-voltage switch is controlled by adopting the battery management system provided by the embodiment of the invention, so that the function of keeping the high-voltage switch on and off can be realized when the MCU is reset, unexpected disconnection of the high-voltage switch when the vehicle runs 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 on state during MCU reset, for a circuit for controlling a high voltage switch to maintain an on state including a driving switch, a timer, and an MCU, the method comprising: 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 count time, and recording and storing a high-voltage switch actuation flag bit; and after resetting, detecting that the high-voltage switch keeps the suction flag bit set to control the high-voltage switch to be sucked or disconnected.

According to the method for controlling the high-voltage switch to keep the attraction state during MCU reset, when reset occurs, the high-voltage switch attraction instruction is sent to the driving circuit through the MCU before reset, the timer starts timing according to the high-voltage switch attraction instruction, the high-voltage switch keeps the attraction state in the timing threshold, the MCU records and stores the high-voltage switch attraction flag bit, after reset, the MCU controls the high-voltage switch to be attracted or disconnected according to the situation that the high-voltage switch attraction flag bit is kept to be set by detecting the high-voltage switch stored before reset, and therefore the high-voltage switch can be controlled to be in a normal state during abnormal reset or normal reset according to the situation of a reset signal when the MCU is in a reset period, the situation that the high-voltage switch is suddenly disconnected during unexpected reset is prevented, user experience is improved, and compared with a capacitor mode, the method in the embodiment of the invention does not cause power-on delay.

In some embodiments, the case according to the reset signal includes: 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 turned on or off according to the condition that the high voltage switch keeps the actuation flag bit set includes: when the high-voltage switch keeps the suction flag bit set, sending the suction instruction of the high-voltage switch to the driving switch so that the driving switch drives the high-voltage switch to suck and re-control the timer to count until the MCU is recovered to be normal; or if the high-voltage switch is detected to keep the suction flag bit unset, the timer is not controlled to count again, and when the timer exceeds a timing threshold value, the timer overflows and sends a command for clearing the suction of the high-voltage switch to the driving switch so that the driving switch drives the high-voltage switch to be disconnected.

In some embodiments, detecting that the high voltage switch keeps the actuation flag bit set, sending the high voltage switch actuation command to the drive switch includes: and in the guiding stage, detecting that the high-voltage switch keeps the suction flag bit set, and sending the suction instruction of the high-voltage switch to the driving switch so as to enable the driving switch to drive the high-voltage switch to suck.

In some embodiments, detecting that the high voltage switch keeps the actuation flag bit set, sending the high voltage switch actuation command to the drive switch, further includes: and jumping to an application program from the guiding stage, detecting that the high-voltage switch keeps the suction flag bit set, and sending the high-voltage switch suction instruction to the driving switch again so as to enable the driving switch to drive the high-voltage switch to be sucked.

An embodiment of a fifth aspect of the present invention provides a non-transitory computer storage medium having stored thereon a computer program that, when executed, implements the method for controlling a high voltage switch to maintain an on state when the MCU resets as described in the above embodiment.

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 foregoing and/or additional aspects and advantages of the invention will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:

FIG. 1 is a block diagram of a circuit for controlling a high voltage switch to maintain an on state when an MCU is reset according to one embodiment of the present invention;

FIG. 2 is a block diagram of a circuit for controlling a high voltage switch to maintain an on state when an MCU is reset according to another embodiment of the present invention;

FIG. 3 is a block diagram of a circuit for controlling a high voltage switch to maintain an on state when an MCU is reset according to another embodiment of the present invention;

FIG. 4 is a block diagram of a circuit for controlling a high voltage switch to maintain an on state when an MCU is reset according to another embodiment of the present invention;

fig. 5 is a block diagram of a battery management system according to an embodiment of the present invention;

FIG. 6 is a block diagram of a vehicle according to one embodiment of the invention;

fig. 7 is a flowchart of a method of controlling the high voltage switch to maintain the on state when the MCU is reset according to one embodiment of the present invention.

Reference numerals:

a vehicle 100; a battery management system 10;

a circuit 1 for controlling the high-voltage switch to keep the attraction state when the MCU is reset; MCU 2; a driving 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, by way of example with reference to the accompanying drawings.

In order to solve the above problems, a circuit for controlling the high-voltage switch to maintain the on state during the reset of the MCU according to an embodiment of the present invention is described below with reference to the accompanying drawings, which can achieve the effect of controlling the high-voltage switch to maintain the on state during the reset of the MCU, and does not cause power-on delay.

Fig. 1 is a block diagram of a circuit for controlling a high-voltage switch to maintain an on state when an MCU is reset according to an embodiment of the present invention, and as shown in fig. 1, a circuit 1 according to an embodiment of the present invention includes a driving circuit 3 and an MCU2.

The driving circuit 3 includes a driving switch 31 and a timer 32, the driving switch 31 is connected to the high voltage switch 4, and the driving switch 31 is used for being closed within a timing threshold of the timer 32 when receiving a high voltage switch actuation command, so that the high voltage switch 4 keeps actuation.

The MCU2 is connected to the driving switch 31 and the timer 32, and is configured to detect a reset signal, send a high voltage switch actuation command before resetting according to the condition of the reset signal, control the timer 32 to count time, record and store a high voltage switch keep-actuating flag bit, and detect that the high voltage switch keep-actuating flag bit is set after resetting, and control the high voltage switch to actuate or to open according to the condition that the high voltage switch keep-actuating flag bit is set.

In an embodiment, the conditions of the reset signal include a normal reset signal and an abnormal reset signal. Specifically, during normal operation, the MCU2 controls the on/off of the high-voltage switch 4 by controlling the high/low level signal output from the port of the driving switch 31. When the MCU2 is reset, if the reset signal is normal, the high-voltage switch 4 needs to be controlled to be turned off by default in a delayed manner; if the reset is abnormal, the high-voltage switch 4 needs to be controlled to maintain the on state to avoid the situation of abrupt disconnection, so in the embodiment of the present invention, the MCU2 determines whether the reset is an abnormal reset signal according to the detected reset signal situation, that is, analyzes 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 signal is an abnormal reset signal, for example, the reset signal triggered by the external interrupt or the reset signal caused by the self fault is the reset signal caused by the abnormal cause. Furthermore, the situation that the high-voltage switch keeps the suction flag bit to be set is recorded and stored according to the situation of the reset signal, and the high-voltage switch is controlled to be suction or cut off according to the situation that the high-voltage switch keeps the suction flag bit to be set, so that when the MCU is reset, according to the situation of the reset signal, the high-voltage switch can be controlled to be in a normal state during abnormal reset or normal reset, the situation that the high-voltage switch is suddenly cut off when the MCU is abnormal in reset is prevented, the user experience is improved, and compared with a capacitor mode, the circuit provided by the embodiment of the invention is based on the setting of a timer, and power-on delay is not caused.

Specifically, in response to the reset signal, before resetting, the MCU2 records the reset signal, so as to determine whether the high-voltage switch needs to be kept in actuation, and store whether the state of keeping actuation is stored, that is, if the high-voltage switch is determined to be a normal reset signal, the high-voltage switch does not need to be set to keep the actuation flag bit, so that after resetting, the MCU2 detects that the high-voltage switch stored before resetting remains the actuation flag bit unset, and then 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 holding and sucking flag bit is required to be set, so that after reset, the MCU2 detects that the high-voltage switch holding and sucking flag bit stored before reset is set, and then the high-voltage switch 4 is controlled to be kept sucking. Namely, the embodiment of the invention distinguishes the normal reset signal and the abnormal reset signal according to the high-voltage switch holding pull-in flag bit, thereby controlling the state of the high-voltage switch.

The setting means changing the circuit state at the specified position to a high potential. In the embodiment of the invention, the high-voltage switch keeps the actuation flag bit set, which can be understood that the MCU2 needs to control the high-voltage switch 4 to keep actuation. For example, if the high-voltage switch is set to keep the actuation flag bit 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 actuation within a timing threshold; if the high-voltage switch keeps the attraction flag bit to be 0, that is, the high-voltage switch keeps the attraction flag bit not set, the MCU2 determines that the reset signal is a normal reset signal according to the flag bit 0, and then the high-voltage switch 4 is controlled to be turned off after the attraction state reaches a timing threshold.

The driving switch 31 in the circuit 1 of the embodiment of the invention is connected with the control end of the high-voltage switch 4 to control the high-voltage switch 4 to drive, and the MCU2 controls the driving switch 31 to drive, and the circuit 1 of the embodiment of the invention has a certain delay function based on the timer 32 arranged in the driving circuit 3, so that the high-voltage switch 4 can be prevented from being unexpectedly opened during reset, and the MCU successfully resets in the timing threshold of the timer 32, namely, in the delay period maintained by the closing of the driving switch 31, thereby realizing the delayed opening of the high-voltage switch 4 for an ultra-long time, and enabling the MCU2 to be continuously controlled to be closed after the recovery.

In an embodiment, a high voltage switch hold pull flag may be written to NVW (Non-volati lity Memory, nonvolatile memory) to facilitate querying of this flag after reset.

In some embodiments, the high voltage switch 4 will open by default when the timer 32 times an overflow. The driving switch 31 is connected to the timer 32 and the MCU2, respectively, and when the timer 32 reaches a timing threshold, the driving switch 31 can directly detect a signal overflowed by the timer 32, so as to drive the high-voltage switch 4 to be turned off. Alternatively, the driving switch 31 may be connected to the MCU2 only, the MCU2 monitors the timing duration of the timer 32, and when the timing duration of the timer 32 reaches a timing threshold, i.e., the timing overflows, the MCU2 controls the driving switch 31 to drive the high-voltage switch to be turned off.

In an embodiment, the timing threshold of the timer may be configured to be 10ms to 300ms. For example, the timing threshold may be set to 150ms, 200ms or 300ms, the time for the high-voltage switch 4 to delay and keep depends on the timer 32, and the timing threshold of the timer 32 may be configured by an external circuit according to actual requirements, so that by adjusting the timing threshold, the duration for the high-voltage switch 4 to delay and keep can be adjusted, and the adjustment range is wider, and the control manner is more flexible and changeable.

According to the circuit 1 for controlling the high-voltage switch to keep the attraction state during MCU reset according to the embodiment of the invention, based on the delay function of the built-in timer 32 in the driving circuit 3 and the driving switch 31, the high-voltage switch 4 is driven to keep the attraction state, when reset happens, the high-voltage switch attraction instruction is sent to the driving circuit 3 through the MCU2, the timer 32 starts timing according to the high-voltage switch attraction instruction, the high-voltage switch 4 keeps the attraction state in a timing threshold value, and the MCU records and stores the high-voltage switch keep the attraction flag bit, and after reset, the MCU2 controls the high-voltage switch to be attracted or disconnected according to the situation that the high-voltage switch keep the attraction flag bit is set by detecting the high-voltage switch stored before reset, so that when the MCU2 resets, according to the situation of a reset signal, the high-voltage switch can be in a normal state during abnormal reset or normal reset, the high-voltage switch is prevented from being suddenly disconnected during the MCU, and compared with a mode of adopting a capacitor, the circuit of the embodiment of the invention can not cause the delay due to the setting of the timer 32.

In an embodiment, for the MCU, controlling the high-voltage switch to be turned on or off according to the situation that the high-voltage switch keeps the actuation flag bit being set includes, after resetting, if detecting that the high-voltage switch keeps the actuation flag bit being set, sending, by the MCU2, a high-voltage switch actuation command to the driving switch 31, so that the driving switch 31 drives the high-voltage switch 4 to actuate, and controlling the timer 32 to count until the MCU2 returns to normal; or if the high-voltage switch keeps the suction flag bit unset, the timer 32 is not controlled to count again, and when the timer 32 exceeds the timing threshold value, the timer 32 overflows and sends a high-voltage switch suction clearing command to the driving switch 31 so that the driving switch 31 drives the high-voltage switch 4 to be disconnected.

That is, if the high-voltage switch is a normal reset signal, before resetting, the MCU2 sends a high-voltage switch actuation command to the driving switch 31 to make the driving switch 31 drive the high-voltage switch 4 to actuate, the timer 32 is controlled to start timing, record and store a high-voltage switch keep actuation flag bit, and after resetting, the MCU2 detects that the high-voltage switch stored before resetting remains the actuation flag bit unset through inquiry, after the timer 32 overflows during timing, sends a high-voltage switch actuation command to the driving switch 31, and the driving switch 31 controls the high-voltage switch 4 to be opened by default in a delayed manner; if the abnormal reset is performed, before the reset, the MCU2 sends a high-voltage switch actuation instruction, controls the timer 32 to count time, sets the high-voltage switch to keep the actuation flag bit, after the reset, the MCU2 inquires that the high-voltage switch stored before the reset is not set, and continues to send the high-voltage switch actuation instruction, so that the high-voltage switch 4 keeps actuation, and controls the timer 32 to count time again until the MCU2 is in a normal state.

In the abnormal resetting process, in response to the high-voltage switch actuation command, the timer 32 can restart the timing, and the timing threshold of the timer 32 can be adjusted externally, when the timer 32 starts to count until the timing reaches the timing threshold, the MCU2 cannot recover to the normal state, the high-voltage switch actuation command is sent again, so that the timer 32 is restarted, the situation that the high-voltage switch is disconnected due to overflow of the timer 32 during timing is avoided, namely after resetting, one or more high-voltage switch actuation commands can be sent through the MCU2, and the timer 32 is controlled to restart, so that the MCU2 can have enough time to recover to the normal state.

In an embodiment, the MCU2 enters a boot phase after reset, and then jumps from the boot phase to the application program to complete an initialization process, wherein after the MCU2 is reset, a small amount of instructions and data are input by the MCU2, and then other programs are input by the MCU2, and this process is called the boot phase.

Therefore, in the circuit 1 of the embodiment of the present invention, when detecting that the high-voltage switch keep-on flag bit is set and sending the high-voltage switch on command, the MCU2 is configured to detect that the high-voltage switch keep-on flag bit is set and send the high-voltage switch on command to the driving switch 31 in the guiding stage, so that the driving switch 31 continues to control the high-voltage switch 4 to keep on. And jumping to an application program in the guiding stage, and when the MCU2 detects that the high-voltage switch keeps the actuation flag bit being set, sending the high-voltage switch actuation command to the drive switch 31 again so that the drive switch 31 continuously controls the high-voltage switch 4 to keep the actuation state until the MCU2 finishes the initialization process and returns to the normal state.

Therefore, the circuit 1 of the embodiment of the invention distinguishes whether the reset signal is abnormal or not according to the high-voltage switch holding pull-in flag bit written before the reset of the MCU2, and further executes whether the pull-in state is required or not, and based on the delay function of the timer 32 built in the driving circuit 3, the high-voltage switch pull-in instruction is respectively sent to the driving circuit 3 before and after the reset, and the timer 32 is controlled to be re-timed when the high-voltage switch pull-in instruction is sent each time, namely the timer 32 is automatically cleared, so that the high-voltage switch 4 is prevented from being disconnected due to overflow of the timer 32 before the reset, and the high-voltage switch 4 is ensured to keep the pull-in state continuously, thereby enabling the MCU2 to have enough time to recover the normal state, realizing the function of controlling the high-voltage switch to keep the pull-in state when the MCU2 is reset, and realizing simple implementation mode and low cost.

In an embodiment, the driving switch 31 may be a single high-side switch 33, as shown in fig. 2; alternatively, a single low-side switch 34 may be used, as shown in FIG. 3; or both the high side switch 33 and the low side switch 34 may be selected as shown in fig. 4.

The following describes in detail the operation of the circuit for controlling the high-voltage switch to maintain the on state when the MCU in the embodiment of the present invention resets, taking the circuit connection mode shown in fig. 4 as an example.

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 corresponding ports, and controls the timer 32 to start timing, and the MCU2 analyzes the reset reason according to the reset signal, determines whether actuation is required to be maintained, and writes the state of whether actuation is maintained into the NVW, that is, records as a high-voltage switch actuation maintaining flag bit.

Further, after the reset power-on, the MCU2 determines whether the normal reset power-on or the abnormal reset power-on is performed according to the stored high-voltage switch holding actuation flag bit, so as to further execute whether to control the high-voltage switch to maintain the actuation state. If it is determined that normal reset is powered on, for example, the high-voltage switch keeps the actuation flag bit to be 0, that is, the high-voltage switch keeps the actuation flag bit not set, and the high-voltage switch 4 defaults to be turned off in a delayed manner; if it is determined that the abnormal reset is powered up, for example, the high voltage switch keeps the actuation flag bit being 1, that is, the high voltage switch keeps the actuation flag bit being set, the MCU2 continues to send the high voltage switch actuation command, so that the high voltage switch keeps the actuation state, and the timer 32 can be controlled to count again by sending one or more high voltage switch actuation commands, so that the MCU2 has enough time to recover to the normal state.

For example, after the MCU2 is reset, a boot program is executed, in a boot program stage, it is queried whether a high-voltage switch holding and sucking flag bit in the NVW is set, if the high-voltage switch holding and sucking flag bit is detected to be in a set state, the MCU2 simultaneously continues to send high-voltage switch sucking instructions to the high-side switch 33 and the low-side switch 34 through corresponding ports respectively, so that the high-voltage switch 4 continues to be in a sucking state, and further, the MCU2 jumps from the boot program to an application program, it is queried whether the high-voltage switch holding and sucking flag bit in the NVW is set, if the high-voltage switch holding and sucking flag bit is detected to be in a set state, the MCU2 simultaneously continues to send high-voltage switch sucking instructions to the high-side switch 33 and the low-side switch 34 through corresponding ports respectively, so that the high-voltage switch 4 continues to be in a sucking state, and the MCU2 completes an initialization process, and enters a normal control flow.

Therefore, the circuit 1 of the embodiment of the 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 reset, the MCU2 sends the high-voltage switch actuation command to the driving switch 31 to trigger the high-voltage switch 4 to keep the actuation state, controls the timer 32 to start timing, and sets the high-voltage switch to keep the actuation flag bit, so that after the reset, the MCU2 inquires that the high-voltage switch keeps the actuation flag bit to be set, determines that the high-voltage switch actuation command needs to be continuously sent, that is, in a guiding stage and an application program, the MCU2 respectively communicates with the driving switch 31 once, clears the timer 32 and rechems the timer, so as to prevent the high-voltage switch 4 from being turned off due to overflow of the timer 32 before the MCU2 is recovered, ensure that the high-voltage switch 4 keeps the actuation state, thereby realizing the function of controlling the high-voltage switch 4 to keep the actuation state when the MCU2 is abnormally reset, and improving user experience.

An embodiment of the second aspect of the present invention provides a battery management system, as shown in fig. 5, where the battery management system 10 includes the circuit 1 for controlling the high-voltage switch to maintain the on state during the reset of the MCU provided in the above embodiment, and reference is made to the specific operation mode of the circuit 1 for controlling the high-voltage switch to maintain the on state during the reset of the MCU.

According to the battery management system 10 of the embodiment of the present invention, by adopting the circuit 1 for controlling the high-voltage switch to keep the on state during the reset of the MCU provided by the above embodiment, it is possible to realize that the high-voltage switch is controlled to keep the on state during the reset of the MCU, and no power-on delay is caused.

A third aspect of the present invention provides a vehicle, as shown in fig. 6, the vehicle 100 including a high-voltage switch 4 and a battery management system 10.

The battery management system 10 is connected with the high-voltage switch 4, and is used for controlling the high-voltage switch 4 to keep a suction 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 down, so as to realize high-voltage safety.

According to the vehicle 100 of the embodiment of the present invention, by adopting the battery management system 10 provided in the above embodiment to control the state of the high-voltage switch 4, the function of maintaining the on state of the high-voltage switch 4 can be realized when the MCU is reset, which prevents the high-voltage switch 4 from being unexpectedly turned off when the vehicle is running, and improves the user experience.

An embodiment of the fourth aspect of the present invention provides a method for controlling a high voltage switch to maintain an on state during MCU reset, which is used for a circuit for controlling a high voltage switch to maintain an on state including a driving switch, a timer, and an MCU, as shown in fig. 7, the method of the embodiment of the present invention includes steps S1 to S3.

Step S1, a reset signal is detected.

And step S2, according to the condition of the reset signal, before resetting, sending a high-voltage switch actuation command, controlling a timer to count time, and recording and storing the actuation flag bit of the high-voltage switch.

In an embodiment, in order to avoid a situation that a high-voltage switch is suddenly disconnected due to unexpected reset of an MCU in a running process of a vehicle, the embodiment of the invention provides a method for controlling the high-voltage switch to keep a suction state during the reset of the MCU, wherein a control end of the high-voltage switch selects a driving circuit to drive, and the driving circuit is controlled by the MCU to execute driving.

In an embodiment, the conditions of the reset signal include a normal reset signal and an abnormal reset signal. In response to the reset signal, before resetting, the MCU judges whether the resetting is normal according to the reset signal, so as to judge whether the high-voltage switch needs to be kept in the actuation state during the resetting, namely, the high-voltage switch keeping actuation flag bit of the resetting is recorded and stored. For example, if the MCU itself is in error and is reset, or the external power supply is lost to trigger the MCU to reset, or the external interference triggers the MCU to reset, the reset signal is determined to be an abnormal reset signal.

In the embodiment, based on a timer built in the driving circuit, the function of controlling the delay disconnection of the high-voltage switch when the MCU is reset is realized. Specifically, in response to the reset signal, before resetting, the MCU records the reset signal, so as to determine whether the high voltage switch needs to be kept in a closed state, and stores whether the high voltage switch needs to be kept in a closed state, that is, if the high voltage switch is determined to be normally reset according to the reset signal, the high voltage switch does not need to be set to keep the closed flag bit, and if the high voltage switch is determined to be abnormally reset according to the reset signal, the high voltage switch needs to be set to keep the closed flag bit, and meanwhile, the MCU triggers the high voltage switch to close the command, that is, 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 a closed state within the timing threshold of the timer to execute step S3.

And S3, after resetting, detecting that the high-voltage switch keeps the suction flag bit set to control the high-voltage switch to be sucked or disconnected.

In an embodiment, after the reset, the MCU determines whether the high voltage switch needs to continue to maintain the on state according to the high voltage switch keep on flag bit stored before the reset, that is, controls the high voltage switch to be on or off according to the situation that the high voltage switch keep on flag bit is set. If the high-voltage switch keeps the suction zone bit to be set, the MCU sends a high-voltage switch suction instruction to the driving switch to control the high-voltage switch to keep the suction state continuously, if the high-voltage switch keeps the suction zone bit to be set, the MCU does not need to send the high-voltage switch suction instruction to the driving switch, and the high-voltage switch is delayed to be disconnected by default, so that when the MCU resets, the high-voltage switch can be controlled to be in a normal state according to the reset signal condition when the MCU resets abnormally or resets normally, the situation that the high-voltage switch is suddenly disconnected when the MCU resets abnormally is prevented, the user experience is improved, and compared with a capacitor mode, the circuit provided by the embodiment of the invention is based on the setting of the timer, and power-on delay is not caused.

In some embodiments, controlling the high voltage switch to be turned on or off in accordance with a situation in which the high voltage switch keeps the on flag set comprises: when the high-voltage switch is detected to keep the suction flag bit set, the MCU sends a high-voltage switch suction instruction to the drive switch so that the drive switch drives the high-voltage switch to suck, and the timer is controlled again to count until the MCU is recovered to be normal; or when the high-voltage switch is detected to keep the suction flag bit unset, the timer is not controlled to count again, and when the timer exceeds the timing threshold value, the timer overflows and sends a suction instruction for cleaning the high-voltage switch to the driving switch so that the driving switch drives the high-voltage switch to be disconnected. Therefore, the method of the embodiment of the invention distinguishes whether the reset signal is abnormal or not according to the high-voltage switch holding and closing flag bit written before the MCU is reset, further executes whether the holding and closing state is needed or not, and based on the time delay function of the built-in timer of the driving circuit, the high-voltage switch holding and closing instruction is respectively sent to the driving circuit before and after the reset, the timer is controlled to reckon when the high-voltage switch holding and closing instruction is sent each time, namely the timer is automatically cleared, so that the high-voltage switch is prevented from being disconnected due to overflow of the timer before the reset, the high-voltage switch is ensured to keep the holding and closing state, thereby the MCU has enough time to restore the normal state, the function of controlling the high-voltage switch to keep the holding and closing state is realized, and the implementation mode is simple and the cost is low.

In an embodiment, after reset, the MCU enters a bootstrap program and jumps from the bootstrap program to an application program to complete an initialization process, so in the circuit of the embodiment of the present invention, when detecting that the high voltage switch keeps the actuation flag bit set, the MCU sends an actuation instruction of the high voltage switch to the driving switch, including: in the guiding stage, when the MCU detects that the high-voltage switch keeps the suction flag bit to be set, the MCU sends a high-voltage switch suction instruction to the driving switch so as to enable the driving switch to continuously control the high-voltage switch to keep the suction state.

And jumping to an application program from the guiding stage, and when the MCU detects that the high-voltage switch keeps the suction flag bit to be set, retransmitting a high-voltage switch suction instruction to the driving switch so as to enable the driving switch to continuously control the high-voltage switch to keep the suction state.

An embodiment of a fifth aspect of the present invention provides a non-transitory computer storage medium having a computer program stored thereon, wherein the computer program when executed implements the method for controlling the high voltage switch to maintain the on state when the MCU provided in the above embodiment is reset.

In the description of this specification, any process or method description in a flowchart or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing logical functions or steps of the process, and in which the scope of the preferred embodiments of the present invention include additional implementations 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.

Logic and/or steps represented in the flowcharts or otherwise described herein, e.g., a ordered listing of executable instructions for implementing 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). In addition, the computer readable medium may even be paper or other suitable medium on which the program is printed, as the program may 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 is to be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above-described embodiments, the various steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. As with the other embodiments, if implemented in hardware, may be implemented using any one or combination of the following techniques, as is well known in the art: discrete logic circuits having logic gates for implementing logic functions on data signals, application specific integrated circuits having suitable combinational logic gates, programmable Gate Arrays (PGAs), field Programmable Gate Arrays (FPGAs), and the like.

Those of ordinary skill in the art will appreciate that all or a portion of the steps carried out in the method of the above-described embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, and where the program, when executed, includes one or a combination of the steps of the method embodiments.

In addition, each functional unit in the embodiments of the present invention may be integrated in one processing module, or each unit may exist alone physically, or two or more units may be integrated in one module. The integrated modules may be implemented in hardware or in software functional modules. The integrated modules may also be stored in a computer readable storage medium if implemented in the form of software functional modules and sold or used as a stand-alone product.

The above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, or the like. While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.

In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means 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, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A circuit for controlling a high-voltage switch to maintain an actuation state when an MCU is reset, the circuit comprising:

the driving circuit comprises a driving switch and a timer, wherein the driving switch is connected with the high-voltage switch, and the driving switch is used for being closed within a timing threshold value of the timer when receiving a high-voltage switch actuation command so as to keep the high-voltage switch actuated;

the MCU is respectively connected with the driving switch and the timer, and is used for detecting a reset signal, sending the high-voltage switch actuation command, controlling the timer to time and recording and storing the high-voltage switch actuation flag bit before resetting according to the condition of the reset signal;

and the MCU is also used for detecting the situation that the high-voltage switch keeps the suction flag bit to be set after resetting, and controlling the high-voltage switch to be sucked or disconnected according to the situation that the high-voltage switch keeps the suction flag bit to be set.

2. The circuit for controlling a high voltage switch to maintain an on state in accordance with 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 circuit for controlling a high voltage switch to maintain an on state according to the reset of the MCU of claim 2, wherein the MCU is used for controlling the high voltage switch to be on or off according to the condition that the on flag of the high voltage switch is set,

when the high-voltage switch keeps the suction flag bit set, sending the suction instruction of the high-voltage switch to the driving switch so that the driving switch drives the high-voltage switch to suck and re-control the timer to count until the MCU is recovered to be normal;

or if the high-voltage switch is detected to keep the suction flag bit unset, the timer is not controlled to count again, and when the timer exceeds a timing threshold value, the timer overflows and sends a command for clearing the suction of the high-voltage switch to the driving switch so that the driving switch drives the high-voltage switch to be disconnected.

4. A circuit for controlling a high voltage switch to maintain an actuation state according to claim 3, wherein the MCU is configured to, when detecting that the high voltage switch maintaining actuation flag is set and transmitting the high voltage switch actuation driving command, detect that the high voltage switch maintaining actuation flag is set and transmit the high voltage switch actuation command to the driving switch to actuate the high voltage switch during a boot phase.

5. The circuit for controlling a high voltage switch to maintain an on state according to claim 4, wherein the MCU is further configured to skip from the boot phase to an application program, detect that the high voltage switch maintains an on flag bit set, and send the high voltage switch on command to the driving switch again, so that the driving switch drives the high voltage switch to engage.

6. A battery management system comprising a circuit for controlling a voltage switch to maintain an on state when the MCU of any of claims 1-5 is reset.

7. A vehicle, characterized by comprising:

a high voltage switch;

the battery management system of claim 6, connected to the high voltage switch for controlling the high voltage switch to remain on when the MCU resets.

8. A method for controlling a high voltage switch to maintain an on state when an MCU is reset, the method comprising:

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 count time, and records and stores the high-voltage switch actuation flag bit;

And after resetting, the MCU detects the situation that the high-voltage switch keeps the suction flag bit set, and controls the high-voltage switch to be sucked or disconnected according to the situation that the high-voltage switch keeps the suction flag bit set.

9. The method for controlling a high voltage switch to maintain an on state according to the reset of the MCU of claim 8, wherein the step of 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 a high-voltage switch to maintain an actuation state during MCU reset according to claim 9, wherein controlling actuation or disconnection of the high-voltage switch according to a situation that the high-voltage switch maintains an actuation flag bit to be set comprises:

11. The method for controlling a high voltage switch to maintain an actuation state during MCU reset of claim 10, wherein detecting that the high voltage switch maintains an actuation flag bit set and sending the high voltage switch actuation command to the drive switch comprises:

and in the guiding stage, detecting that the high-voltage switch keeps the suction flag bit set, and sending the suction instruction of the high-voltage switch to the driving switch so as to enable the driving switch to drive the high-voltage switch to suck.

12. The method for controlling a high voltage switch to maintain an actuation state during MCU reset of claim 11, wherein detecting that the high voltage switch maintains an actuation flag bit set and sending the high voltage switch actuation command to the drive switch further comprises:

and jumping to an application program from the guiding stage, detecting that the high-voltage switch keeps the suction flag bit set, and sending the high-voltage switch suction instruction to the driving switch again so as to enable the driving switch to drive the high-voltage switch to be sucked.

13. A non-transitory computer storage medium having stored thereon a computer program, wherein the computer program when executed implements the method of controlling a high voltage switch to maintain an on state when the MCU of any of claims 8-12 is reset.