CN111516497A

CN111516497A - Load control method and circuit, battery management system and vehicle

Info

Publication number: CN111516497A
Application number: CN202010357338.8A
Authority: CN
Inventors: 骆会秀; 傅焱辉; 娄其栋
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2020-04-29
Filing date: 2020-04-29
Publication date: 2020-08-11
Anticipated expiration: 2040-04-29

Abstract

The embodiment of the invention relates to the technical field of circuits, and discloses a load control method and circuit, a battery management system and a vehicle. The load control method comprises the following steps: according to a driving signal output by the controller, the load control device controls the switch of the load unit to be conducted, and the driving signal is a signal generated by the controller based on a load working instruction; according to the driving signal, the load control device controls an energy storage capacitor of the load control device to store energy; when the driving signal is in a high-impedance state, the load control device controls the energy storage capacitor to discharge in a first time period, so that the switch of the load unit is kept on. According to the invention, the load is kept in the working state, the unexpected power failure of the load caused by the unexpected reset of the controller is avoided, the load is ensured to be kept in the working state during the unexpected reset of the controller, and the safety is improved.

Description

Load control method and circuit, battery management system and vehicle

Technical Field

The embodiment of the invention relates to the technical field of circuits, in particular to a load control method and circuit, a battery management system and a vehicle.

Background

With the development of battery technology, the electric automobile replacing fuel automobile has become the development trend of automobile industry. In an electric vehicle, high-power switching devices, such as relays, contactors, and loads, are used, and are important for safe operation of the entire vehicle. Due to the complex driving environment and the service life of the load, the devices may fail, and a great potential safety hazard exists.

The inventor finds that at least the following problems exist in the prior art: when the MCU is unexpectedly reset, the load is unexpectedly powered down, so that the electric automobile suddenly loses power, and the safety of personnel on the automobile is affected.

Disclosure of Invention

The embodiment of the invention aims to provide a load control method and circuit, a battery management system and a vehicle, so that a load keeps a working state, unexpected power failure of the load caused by unexpected reset of a controller is avoided, the load is ensured to keep the working state during the unexpected reset of the controller, and the safety is improved.

In order to solve the above technical problem, an embodiment of the present invention provides a load control method, including: according to a driving signal output by the controller, the load control device controls the switch of the load unit to be conducted, and the driving signal is a signal generated by the controller based on a load working instruction; according to the driving signal, the load control device controls an energy storage capacitor of the load control device to store energy; when the driving signal is in a high-impedance state, the load control device controls the energy storage capacitor to discharge in a first time period, so that the switch of the load unit is kept on.

An embodiment of the present invention provides a load control circuit including: the controller and the load control device are connected with each other; the controller is used for generating a driving signal based on the load working instruction; the load control device is used for controlling an energy storage capacitor of the load control device to store energy according to the driving signal; the load control device is also used for controlling the energy storage capacitor to discharge in a first time period when the driving signal is in a high-impedance state, so that the switch of the load unit is kept on.

The embodiment of the invention also provides a battery management system which comprises the load control circuit.

The embodiment of the invention also provides a vehicle comprising the battery management system.

Compared with the prior art, the load control device controls the switch of the load unit to be conducted when receiving a signal generated by the controller based on a load working instruction, so that the load in the load unit enters a working state, and simultaneously controls the energy storage capacitor to be charged, when the controller is unexpectedly reset, the driving signal is changed into a high-resistance state, and at the moment, the load control device controls the energy storage capacitor to be discharged, so that the switch of the load unit is kept conducted, namely the load is kept in the working state, the unexpected power failure of the load caused by the unexpected reset of the controller is avoided, the load is ensured to be kept in the working state during the unexpected reset of the controller, and the safety is improved.

In addition, the load control device controls the switch of the load unit to be turned off after the first period of time. In this embodiment, when the load is in the operating state, if the controller is unexpectedly reset, the load can be set to maintain the operating state only during the reset period of the controller, and if the controller is not reset after the preset time, it indicates that the controller has a fault, and at this time, the load can be timely disconnected, so that the load enters the non-operating state.

In addition, the driving signal includes a first driving signal and a second driving signal, and according to the driving signal, the load control device controls the energy storage capacitor of the load control device to store energy, including: when the first driving signal is at a high level, a time delay circuit in the load control device controls the energy storage capacitor to store energy; when the driving signal is in a high-impedance state, the load control device controls the energy storage capacitor to discharge in a first time period, so that the switch of the load unit is kept on, and the method comprises the following steps: when the first driving signal is in a high-resistance state, the delay circuit controls the energy storage capacitor to discharge, and the logic circuit in the load control device controls the switch of the load unit to be kept on; the load control device controls the switch of the load unit to be turned off after a first period of time, including: according to the second driving signal, a timing circuit in the load control device controls the energy storage capacitor to stop discharging after a first time period, and the logic circuit controls the switch of the load unit to be switched off. This embodiment provides a specific structure of the load control device.

In addition, the load control device controls the switch of the load unit to be turned off according to a third driving signal output by the controller, wherein the third driving signal is a signal generated by the controller based on a load turn-off instruction. In the present embodiment, when the load is in the non-operating state, if the controller unexpectedly resets, the load can be kept in the non-operating state.

In addition, when a functional safety signal output by the functional safety circuit is received, the load control device controls the switch of the load unit to be switched off, and the functional safety signal represents that the controller or a functional unit connected to the controller fails. In the embodiment, when the controller or the preset control unit breaks down, the load can be timely disconnected through the functional safety circuit, and safety is guaranteed.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.

FIG. 1 is a schematic diagram of a load control circuit according to a first embodiment of the present invention;

fig. 2 is a detailed flowchart of a load control method according to a first embodiment of the present invention;

FIG. 3 is a schematic diagram of a load control circuit according to a first embodiment of the present invention, wherein the load control device is connected to both the high-side control circuit and the low-side control circuit;

FIG. 4 is a schematic diagram of a load control circuit according to a first embodiment of the present invention, wherein two load control devices are connected to a high-side control circuit and a low-side control circuit, respectively;

FIG. 5 is a schematic diagram of a load control circuit according to a second embodiment of the present invention;

fig. 6 is a detailed flowchart of a load control method according to a second embodiment of the present invention;

FIG. 7 is a schematic diagram of a load control circuit according to a second embodiment of the present invention, wherein the load control circuit further comprises a functional safety circuit;

fig. 8 is a detailed structural diagram of a load control circuit according to a second embodiment of the present invention;

FIG. 9 is a schematic diagram of a load control circuit according to a second embodiment of the present invention, wherein the sixth resistor is a pull-up resistor;

FIG. 10 is a schematic diagram of a load control circuit according to a second embodiment of the present invention, wherein the sixth resistor is a pull-down resistor;

fig. 11 is a schematic diagram of a battery management system according to a fourth embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that numerous technical details are set forth in order to provide a better understanding of the present application in various embodiments of the present invention. However, the technical solution claimed in the present application can be implemented without these technical details and various changes and modifications based on the following embodiments.

A first embodiment of the present invention relates to a load control method applied to a Battery Management System (BMS) of an electric vehicle, which can maintain a load, such as a relay, a water pump, a valve, etc., in an operating state even when an unexpected reset occurs in a controller MCU of the Battery Management System.

The following description will be made with reference to a load control circuit to which the load control method of the present embodiment is applied.

Referring to fig. 1, the load control circuit includes: the controller 1 and the load control device 2 are connected with each other, the load control device 2 is connected to a switch of the load unit 3, exemplarily, the load unit 3 includes a driving power source 31, a high side control circuit 32, a load 33 and a low side control circuit 34 which are connected in sequence, the low side control circuit 34 is connected to a reference potential bit (the reference potential bit is taken as an example of a reference ground GND in the figure); in this case, the switches of the load unit 3 are the high-side control circuit 32 and the low-side control circuit 34, and the load control device 2 is connected to the high-side control circuit 32 and/or the low-side control circuit 34, and the present embodiment and the following embodiments are described by taking the example in which the load control device 2 is connected only to the high-side control circuit 32.

The specific flow of the load control method of the present embodiment is shown in fig. 2.

Step 101, according to a driving signal output by the controller, the load control device controls the switch of the load unit to be turned on, and the driving signal is a signal generated by the controller based on a load working instruction.

And 102, controlling an energy storage capacitor of the load control device to store energy by the load control device according to the driving signal.

And 103, when the driving signal is in a high-impedance state, the load control device controls the energy storage capacitor to discharge in a first time period, so that the switch of the load unit is kept on.

Specifically, when receiving a load operation instruction, the controller 1 generates a corresponding driving signal and inputs the driving signal to the load control device 2, at this time, the load control device 2 controls the high-side control circuit 32 in the load unit 3 to be turned on, the low-side control circuit 34 is kept to be turned on, the driving power supply 31 supplies power to the load 33, the load 33 enters an operating state, and meanwhile, the load control device 2 controls the energy storage capacitor therein to be charged.

When unexpected reset occurs in the controller 1, and during the reset period of the controller 1, the driving signal changes to a high-impedance state, at this time, the reset time of the controller 1 is a first preset time period, and the load control device 2 controls the energy storage capacitor to discharge in the first preset time period, so that the high-side control circuit 32 keeps conducting, that is, the load 33 is still kept in a working state in the first preset time period when unexpected reset occurs in the controller 1, thereby avoiding unexpected power down of the load 33 due to unexpected reset of the controller 1, and ensuring that the electric vehicle still runs safely during the unexpected reset period of the controller 1. In an example, the load control device 2 controls the switch of the load unit 3 to be turned off after a first time period, that is, after a first preset time period elapses, if the driving signal is still in the high-impedance state, it is indicated that the controller 1 does not complete the reset within the first preset time period, and it is determined that the controller 1 has a fault, at this time, the load control device 2 controls the energy storage capacitor to stop discharging, so that the high-side control circuit 32 is turned off, and the load 33 enters the non-operating state.

It should be noted that, in the embodiment, the load control device is only connected to the high-side control circuit 32 as an example, but not limited thereto, please refer to fig. 3, the load control device 2 can also be connected to the high-side control circuit 32 and the low-side control circuit 34 at the same time; alternatively, referring to fig. 4, the load control circuit may include 2 load control devices 2, and the two load control devices 2 respectively control the high-side control circuit 32 and the low-side control circuit 34. The operation of the load control circuit in fig. 3 and 4 is the same as that described above, and is not described herein again.

Compared with the prior art, the load control device controls the switch of the load unit to be conducted when receiving a signal generated by the controller based on a load working instruction, so that the load in the load unit enters a working state, and simultaneously controls the energy storage capacitor to be charged, when the controller is unexpectedly reset, the driving signal is changed into a high-resistance state, at the moment, the load control device controls the energy storage capacitor to be discharged, so that the switch of the load unit is kept conducted, namely the load is kept in the working state, the unexpected power failure of the load caused by the unexpected reset of the controller is avoided, the load is ensured to be kept in the working state during the unexpected reset of the controller, and the safety is improved.

Referring to fig. 5, in a load control circuit to which the load control method of the present embodiment is applied, a load control device 2 includes a delay circuit 21, a timing circuit 22, and a logic circuit 23 connected to each other. The controller 1 is respectively connected to the delay circuit 21 and the timing circuit 22, the delay circuit 21 is respectively connected to the timing circuit 22 and the logic circuit 23, the logic circuit 23 is connected to the high-side control circuit 32, the driving signal includes a first driving signal and a second driving signal, the controller 1 outputs the first driving signal to the delay circuit 21, and the controller 1 outputs the second driving signal to the timing circuit 22.

Fig. 6 shows a specific flow of the load control method according to the present embodiment.

In step 201, according to a driving signal output by the controller, the load control device controls the switch of the load unit to be turned on, and the driving signal is a signal generated by the controller based on a load working instruction.

Step 202, when the first driving signal is at a high level, a delay circuit in the load control device controls the energy storage capacitor to store energy.

And step 203, when the first driving signal is in a high-impedance state, the delay circuit controls the energy storage capacitor to discharge, and the logic circuit in the load control device controls the switch of the load unit to be kept on.

And step 204, according to the second driving signal, a timing circuit in the load control device controls the energy storage capacitor to stop discharging after the first time period, and controls the switch of the load unit to be switched off through the logic circuit.

Specifically, when receiving the load operation instruction, the controller 1 outputs a high-level first driving signal to the delay circuit 21, when the first driving signal is at a high level, the delay circuit 21 outputs a high-level delay signal to the logic circuit 23, and when the first driving signal is at a high level, the logic circuit 23 outputs a high-level load control signal to the high-side control circuit 32, so that the high-side control circuit 32 is in a conducting state, and the load 33 enters an operating state. And the delay circuit 21 controls the energy storage capacitor therein to charge when the first driving signal is at a high level.

When the controller 1 is unexpectedly reset, and the first driving signal is changed from the high level to the high impedance state, at this time, the delay circuit 21 controls the energy storage capacitor to discharge, the delay circuit 21 still outputs the high level delay signal to the logic circuit 23, and the logic circuit 23 keeps outputting the high level load control signal to the high side control circuit 32, so that the high side control circuit 32 keeps the conducting state, and the load 33 keeps the working state.

When unexpected reset occurs, the controller 1 simultaneously outputs a second driving signal to the timing circuit 22, the timing circuit 22 starts timing after receiving the second driving signal, and controls the energy storage capacitor to stop discharging after the timing reaches a first preset time period, at this time, if the controller 1 is reset, the first driving signal is converted into a high level, and the load 33 can still keep a working state; if the controller 1 is not reset, the first driving signal is still in the high-impedance state, the timing circuit 22 controls the energy storage capacitor to stop discharging, so that the high-side control circuit 32 is turned off, and the load 33 enters a non-working state.

In this embodiment, when the load 33 is in the non-operating state, if the controller 1 is unexpectedly reset, the operation process is as follows:

the controller 1 can output the first driving signal with low level to the delay circuit 21 when not receiving the load working instruction, at this time, the delay circuit 21 outputs the delay signal with low level to the logic circuit 23, the logic circuit 23 outputs the load control signal with low level to the high-side control circuit 32 to disconnect the high-side control circuit 32, at this time, the connection between the load 33 and the driving power source 4 is also disconnected, the load 33 is powered off, and the non-working state is entered.

When the load 33 is in the non-operating state, if the controller 1 is unexpectedly reset, the controller 1 still outputs the first driving signal to the delay circuit 21 to enter the high impedance state, because the energy storage capacitor in the delay circuit 21 is not charged, the delay circuit 21 continues to output the low-level delay signal to the logic circuit 23, the logic circuit 23 continues to output the low-level load control signal to the high-side control circuit 32, and the high-side control circuit 32 is kept off, so that the load 33 is still in the non-operating state, and the error conduction is avoided.

In one example, referring to fig. 7, the load control circuit further includes a functional safety circuit 4.

The output end of the functional safety circuit 4 is connected to the logic circuit 23, and two input ends of the functional safety circuit 4 are respectively connected to the controller 1 and the preset control unit 5. The preset control unit 5 is, for example, a power supply control unit in the BMS system. It should be noted that, in the present embodiment, the functional safety circuit 4 may also be connected to only one of the controller 1 and the preset control unit 5.

The functional safety circuit 4 is configured to output a functional safety signal to the logic circuit 23 in the load control device 2 upon receiving a status signal indicative of a fault from the controller 1 or the preset control unit 5. The functional safety circuit 4 may be an exclusive-or gate circuit, when the controller 1 or the preset control unit 5 detects a fault or a fault itself, the controller outputs a state signal indicating that the fault occurs to the functional safety circuit 4, and the functional safety circuit 4 outputs a functional safety signal, such as a low level signal, to the logic circuit 23.

The logic circuit 23 is configured to output a low-level load control signal to the high-side control circuit 32 when receiving the functional safety signal, so as to disconnect the high-side control circuit 32, and enable the load 33 to enter a non-operating state.

Referring to fig. 8, a specific structure of a load control circuit is shown, and a load control method in this embodiment is described below with reference to the load control circuit in fig. 8.

In this embodiment, the delay circuit 21 includes a first switch module K1, a first resistor R1, and an energy storage capacitor C; the timing circuit 22 includes a timer 221, a second switch module K2 and a second resistor R2; the logic circuit 23 includes an AND circuit AND, a third resistor R3, AND a fourth resistor R4.

The controller 1 is connected to a control end of the first switch module K1, one end of the first switch module K1 is connected to the first power source V1, the other end of the first switch module K1 is connected to one end of the energy storage capacitor C through the first resistor R1, the other end of the energy storage capacitor C is connected to a reference potential (in the figure, the reference potential is taken as a reference ground GND, for example), and a connection point P between the first resistor R1 and the energy storage capacitor C is connected to the logic circuit 23. The power supply terminal of the timer 221 is connected to the second power source V2, the input terminal of the timer 221 is connected to the controller 1, the output terminal of the timer 221 is connected to the control terminal of the second switch module K2, the first terminal of the second switch module K2 is connected to the reference potential level (taking the reference potential level as the ground GND as an example in the figure), and the junction P between the first resistor R1 and the energy storage capacitor C is connected to the second terminal of the second switch module K2. The reference potential is taken as the same reference ground GND for example.

The power supply end of the AND circuit AND is connected to the third power supply V3, the junction P of the first resistor R1 AND the energy storage capacitor C in the delay circuit 21 is connected to the first input end of the AND circuit AND, the controller 1 is connected to the second input end of the AND circuit AND through the third resistor R3, the output end of the AND circuit AND is connected to the high-side control circuit 32, AND the junction Q of the third resistor R3 AND the AND circuit AND is connected to the fourth power supply V4 through the fourth resistor R4. Wherein the third resistor R3 is a current limiting resistor.

The controller 1 can output the first driving signal to the control terminal of the first switch module K1, and the first switch module K1 is turned on when the received first driving signal is at a high level and turned off when the received first driving signal is at a high impedance state. It should be noted that, in this embodiment, the first driving signal may also be set to be a PWM signal with a certain frequency and duty ratio to control the first switch module K1 to be turned on; the first driving signal is set to be a low level signal to control the first switch module K1 to be turned off.

In one example, the logic circuit 23 further includes a third switching module K3, a power supply terminal of the AND gate circuit AND is connected to the fourth power source V4 through the third switching module K3, AND the controller 1 is further connected to a control terminal of the third switching module K3.

In this embodiment, the capacitance value of the energy storage capacitor C may be set according to the normal reset time of the controller 1, and the function of the capacitance value is that during the reset of the controller 1, the discharge time of the energy storage capacitor C is longer than the reset time (the first preset time period) of the controller 1.

When unexpected reset occurs, the controller 1 outputs a second driving signal for triggering the timer 221 to operate to the timer 221, when the timer 221 receives the second driving signal, starts timing, and when the timing reaches a second preset time period, controls the second switch module K2 to close, that is, sends a triggering signal to close the second switch module K2, at this time, the energy storage capacitor C rapidly discharges energy through the second resistor R2, so that a high-level delay control signal is no longer output to the logic circuit 23. The second driving signal is used to trigger the timer 221 to operate, and may be a falling edge generated when the controller 1 is reset.

The controller 1 is further configured to, upon receiving a load disconnection instruction, control the third switching block K3 to turn off to cut off power supply to the AND circuit AND, so that the AND circuit AND outputs a low-level load control signal to the high-side control circuit 32 to turn off the high-side control circuit 32, so that the load 33 is powered off AND enters a non-operating state.

The working process of the load control circuit of the present embodiment from the time when the load control circuit receives the load operation instruction from the controller 1 to the time when the unexpected reset occurs is as follows:

when receiving the load operation command, the controller 1 outputs a high-level first driving signal to the first switch block K1, so that the first switch block K1 is closed, at this time, the high-level first driving signal is output to the AND gate circuit AND through the first switch block K1 AND the first resistor R1, at this time, the AND gate circuit AND outputs a high-level load control signal to the high-side control circuit 32, AND the high-side control circuit 32 is turned on, so that the load 33 enters an operating state. Meanwhile, when the first switch module K1 is closed, the first power source V1 also charges the energy storage capacitor C.

When unexpected reset occurs to the controller 1, the controller 1 outputs a first driving signal to be in a high impedance state, AND simultaneously outputs a second driving signal in a second state to the timer 221, at this time, the timer 221 starts timing, before the timing reaches a first preset time period, the controller 1 is in a reset period, the first switching module K1 receives the first driving signal to be in the high impedance state, so that the first switching module K1 is turned off, at this time, the energy storage capacitor C starts discharging, the first driving signal in a high level is output to the AND circuit AND, the AND circuit AND keeps outputting a load control signal in a high level, the high-side control circuit 32 keeps on, AND the load 33 keeps in a working state.

If the controller 1 is reset before the timer 221 reaches the first preset time period, the controller 1 outputs the first driving signal with a high level to the first switch module K1 to keep the load 33 in the working state, and outputs a reset signal to the timer 221 to reset the timer 221 to stop the timer.

If the controller 1 is not yet reset when the timer 221 reaches the first preset time period, it indicates that the controller 1 may have a fault, at this time, the timer 221 sends a trigger signal to close the second switch module K2, the energy of the energy storage capacitor C is rapidly discharged through the second resistor R2, the first drive signal at the high level is no longer output to the logic circuit 23, then the delay signal at the low level is output to the AND gate circuit AND, the AND gate circuit AND outputs the load control signal at the low level to the high-side control circuit 32, AND the high-side control circuit 32 is turned off, so that the load 33 enters the non-operating state.

In this embodiment, if the controller 1 receives a load off command when the load 33 is in the operating state, a delay time T1 is required for turning off the load 33, AND the delay time T1 is less than the timer time T2 of the timer 221, at this time, if an unexpected reset period occurs in the controller 1 (T3 represents the reset time of the controller 1, T3 < T2), the delay circuit 21 still outputs a high-level delay control signal, which may cause the load 33 to operate erroneously within the time of (T2-T1), AND turns off the load when T1 is reached, possibly damaging the load 33, whereas in this embodiment, the controller 1 controls the third switching module K3 to turn off when receiving the load off command, so as to cut off the power supply of the AND circuit AND, so that the AND circuit AND outputs a low-level load control signal to the high-side control circuit 32, AND turns off the high-side control circuit 32, so as to cut off the load 33, the non-operating state is entered, so that the malfunction of the load 33 is avoided, and the damage to the load 33 is avoided.

In one example, the logic circuit 23 further includes a fifth resistor R5 and a sixth resistor R6, the fifth resistor R5 is a current limiting resistor, and the sixth resistor R6 may be configured as a pull-up resistor or a pull-down resistor. Referring to fig. 9, the sixth resistor R6 is a pull-up resistor, and the controller 1 outputs a low level signal to close the third switch K3 and outputs a high level signal or enters a high impedance state to open the third switch K3. Referring to fig. 10, the sixth resistor R6 is a pull-down resistor, and the controller 1 outputs a high-level signal or enters a high-impedance state to control the third switch K3 to close and outputs a low-level signal to control the third switch K3 to open.

A third embodiment of the present invention relates to a load control circuit, and referring to fig. 1, the load control circuit includes: for details, please refer to the first embodiment, which is not described herein.

The controller 1 is configured to generate a drive signal based on the load work order.

The load control device 2 is used for controlling the energy storage capacitor of the load control device 2 to store energy according to the driving signal.

The load control device 2 is further configured to control the energy storage capacitor to discharge in a first time period when the driving signal is in a high-impedance state, so that the switch of the load unit is kept on.

The load control circuit in this embodiment corresponds to the load control methods in the first and second embodiments, that is, the load control circuits in the above embodiments may be used in this embodiment, and details are not repeated herein.

A fourth embodiment of the present invention relates to a battery management system including the load control circuit in the above-described embodiment for executing the load control method in the above-described embodiment.

Referring to fig. 11, the battery management system includes at least one processor 101 (one is taken as an example in fig. 4); and a memory 102 communicatively coupled to the at least one processor 101; the memory 102 stores instructions executable by the at least one processor 101, and the instructions are executed by the at least one processor 101 to enable the at least one processor 101 to perform the method of the above embodiments.

The processor 101 and the memory 102 may be connected by a bus or other means. Memory 102, which is a non-volatile computer-readable storage medium, may be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The processor 101 executes various functional applications of the device and data processing by running non-volatile software programs, instructions and modules stored in the memory 102, i.e. implementing the load control method in any of the method embodiments described above.

The memory 102 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store filters and the like. Further, the memory 102 may include high speed random access memory 102, and may also include non-volatile memory 102, such as at least one piece of disk memory 102, flash memory device, or other non-volatile solid state memory 102. In some embodiments, memory 102 may optionally include memory 102 located remotely from processor 101, and such remote memory 102 may be connected to an external device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.

One or more modules are stored in the memory 102, which when executed by the one or more processors 101 perform the load control method in any of the method embodiments described above.

The above-mentioned device may execute the method provided by the embodiment of the present application, and has a functional module and a beneficial effect corresponding to the execution method, and reference may be made to the method provided by the embodiment of the present application for technical details that are not described in detail in the embodiment of the present application.

Those skilled in the art can understand that all or part of the steps in the embodiments of the load access detection method may be implemented by instructing related hardware based on a program, where the program is stored in a storage medium and includes several instructions to enable a device (which may be a single chip, a chip, or the like) or a processor (processor) to execute all or part of the steps of the methods in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.

A fifth embodiment of the invention relates to a vehicle that includes the battery management system in the fourth embodiment.

It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples for carrying out the invention, and that various changes in form and details may be made therein without departing from the spirit and scope of the invention in practice.

Claims

1. A load control method, comprising:

according to a driving signal output by a controller, a load control device controls the switch of a load unit to be conducted, wherein the driving signal is a signal generated by the controller based on a load working instruction;

according to the driving signal, the load control device controls an energy storage capacitor of the load control device to store energy;

when the driving signal is in a high-impedance state, the load control device controls the energy storage capacitor to discharge in a first time period, so that the switch of the load unit is kept on.

2. The load control method of claim 1, further comprising:

the load control device controls the switch of the load unit to be turned off after the first period of time.

3. The load control method according to claim 2, wherein the driving signal comprises a first driving signal and a second driving signal, and the controlling of the energy storage capacitor of the load control device by the load control device according to the driving signal comprises:

when the first driving signal is at a high level, a delay circuit in the load control device controls the energy storage capacitor to store energy;

when the driving signal is in a high-impedance state, the load control device controls the energy storage capacitor to discharge in a first time period, so that the switch of the load unit is kept on, including:

when the first driving signal is in a high-impedance state, the delay circuit controls the energy storage capacitor to discharge, and the logic circuit in the load control device controls the switch of the load unit to be kept on;

the load control device controlling the switch of the load unit to be turned off after the first period of time, including:

according to the second driving signal, a timing circuit in the load control device controls the energy storage capacitor to stop discharging after the first time period, and the logic circuit controls the switch of the load unit to be switched off.

4. The load control method of claim 1, further comprising:

and the load control device controls the switch of the load unit to be switched off according to a third driving signal output by the controller, wherein the third driving signal is a signal generated by the controller based on a load switching-off instruction.

5. The load control method of claim 1, further comprising:

when a functional safety signal output by the functional safety circuit is received, the load control device controls the switch of the load unit to be switched off, and the functional safety signal represents that the controller or a functional unit connected to the controller has a fault.

6. A load control circuit, comprising: the controller and the load control device are connected with each other;

the controller is used for generating a driving signal based on a load working instruction;

the load control device is used for controlling an energy storage capacitor of the load control device to store energy according to the driving signal;

the load control device is further configured to control the energy storage capacitor to discharge in a first time period when the driving signal is in a high-impedance state, so that the switch of the load unit is kept on.

7. The load control circuit of claim 6, wherein the load control device is further configured to control the switch of the load unit to open after the first time period.

8. The load control circuit according to claim 7, wherein the driving signal comprises a first driving signal and a second driving signal, the load control device comprises a delay circuit, a timing circuit and a logic circuit connected to each other, and the logic circuit is connected to the switch of the load unit;

the delay circuit is used for controlling an energy storage capacitor in the delay circuit to store energy according to the first driving signal;

the delay circuit is further configured to control the energy storage capacitor to discharge when the first driving signal is in a high-impedance state, and control the switch of the load unit to be kept on through the logic circuit;

the timing circuit is used for controlling the energy storage capacitor to stop discharging after the first time period according to the second driving signal, and controlling the switch of the load unit to be switched off through the logic circuit.

9. The load control circuit according to claim 6, wherein the load control device is further configured to control the switch of the load unit to be turned off according to a third driving signal output by the controller, and the third driving signal is a signal generated by the controller based on a load turn-off command.

10. The load control circuit of claim 6, further comprising a functional safety circuit configured to output a functional safety signal to the load control device upon receiving a status signal indicative of a fault from the controller or a predetermined control unit;

and the load control device is used for controlling the switch of the load unit to be switched off when the functional safety signal is received.

11. A battery management system comprising the load control circuit of any of claims 6 to 10.

12. A vehicle characterized by comprising the battery management system of claim 11.