CN112977068A - High-voltage protection method and device for electric automobile and electric automobile - Google Patents
High-voltage protection method and device for electric automobile and electric automobile Download PDFInfo
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- CN112977068A CN112977068A CN202110292671.XA CN202110292671A CN112977068A CN 112977068 A CN112977068 A CN 112977068A CN 202110292671 A CN202110292671 A CN 202110292671A CN 112977068 A CN112977068 A CN 112977068A
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- 238000007689 inspection Methods 0.000 claims description 6
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/12—Recording operating variables ; Monitoring of operating variables
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
Abstract
The application discloses a high-voltage protection method and device for an electric automobile and the electric automobile, wherein the method comprises the following steps: acquiring input voltage and output voltage of each high-voltage device in a finished automobile loop through a CAN (controller area network); comparing the input voltage and the output voltage of each high-voltage device, and identifying the interlocking state of each high-voltage device; when the interlocking state is a fault state, a high-voltage switch of a loop of the whole vehicle is disconnected, a fault point is determined based on a high-voltage device in the fault state, and fault information is sent to a preset terminal. Therefore, the problem that maintenance personnel need to check and test each connecting part to check the fault due to abnormal disconnection of the loop is solved, high-voltage electric shock accidents are effectively prevented, the safety of the whole vehicle is guaranteed, fault points are quickly located, and the checking and maintaining efficiency is improved.
Description
Technical Field
The application relates to the technical field of vehicles, in particular to a high-voltage protection method and device for an electric automobile and the electric automobile.
Background
Most of electric automobiles are high-voltage systems, the rated voltage of the high-voltage systems is more than 300V, and when high-voltage components are disconnected, the naked high-voltage electricity can cause serious injury to human bodies.
The high-voltage protection scheme in the related art is as follows: the power battery or some other high-voltage component sends +12V in the whole high-voltage loop, the high-voltage component is subjected to uncapping protection, loop interlocking of the high-voltage connecting plug-in and low-voltage plug-in of the high-voltage component are received by the last high-voltage component, and if the +12V is received, the high-voltage loop is considered to be free of disconnection.
However, although this method can effectively prevent high voltage electric shock accidents, if the problem of abnormal disconnection of the loop occurs, it is relatively complicated for maintenance personnel to troubleshoot the fault, and it is necessary to inspect and test each connection portion, which is in urgent need to be solved.
Content of application
The application provides a high-voltage protection method and device for an electric automobile and the electric automobile, and aims to solve the problem that maintenance personnel need to check and test each connecting part to check the fault due to abnormal disconnection of a loop, effectively prevent high-voltage electric shock accidents, guarantee the safety of the whole automobile, quickly locate fault points and improve the checking and maintaining efficiency.
An embodiment of a first aspect of the present application provides a high voltage protection method for an electric vehicle, including the following steps:
acquiring input voltage and output voltage of each high-voltage device in a finished automobile loop through a CAN (controller area network);
comparing the input voltage and the output voltage of each high-voltage device, and identifying the interlocking state of each high-voltage device; and
and when the interlocking state is a fault state, disconnecting a high-voltage switch of the whole vehicle loop, determining a fault point based on a high-voltage device in the fault state, and sending fault information to a preset terminal.
Optionally, the identifying the interlock status of each high voltage device includes:
if the loop interlocking input is high and the loop interlocking output is high, the interlocking state is a normal state;
if the loop interlock input is high and the loop interlock output is low, then the interlock status is a fault status.
Optionally, the identifying the interlock state of each high-voltage device further includes:
if the loop interlock input is low and the loop interlock output is low, then the interlock state is an open state.
Optionally, after disconnecting the high-voltage switch of the vehicle loop, the method further includes:
and controlling the electric drive system of the electric automobile to work so as to carry out high-pressure discharge.
Optionally, before collecting the input voltage and the output voltage of each high-voltage device in the vehicle loop, the method further includes:
receiving a request for completing power-on and self-inspection of the electric automobile;
and after receiving the request, generating a protection instruction to control the power battery to send out a preset interlocking level.
An embodiment of a second aspect of the present application provides a high voltage protection device for an electric vehicle, including:
the acquisition module is used for acquiring the input voltage and the output voltage of each high-voltage device in the loop of the whole vehicle through a Controller Area Network (CAN);
the identification module is used for comparing the input voltage and the output voltage of each high-voltage device and identifying the interlocking state of each high-voltage device; and
and the control module is used for disconnecting the high-voltage switch of the whole vehicle loop when the interlocking state is a fault state, determining a fault point based on a high-voltage device in the fault state, and sending fault information to a preset terminal.
Optionally, the identification module includes:
if the loop interlocking input is high and the loop interlocking output is high, the interlocking state is a normal state;
if the loop interlock input is high and the loop interlock output is low, then the interlock status is a fault status.
Optionally, the identification module further includes:
if the loop interlock input is low and the loop interlock output is low, then the interlock state is an open state.
Optionally, after disconnecting the high-voltage switch of the vehicle loop, the control module further includes:
and controlling the electric drive system of the electric automobile to work so as to carry out high-pressure discharge.
Optionally, before collecting the input voltage and the output voltage of each high-voltage device in the vehicle loop, the collecting module further includes:
receiving a request for completing power-on and self-inspection of the electric automobile;
and after receiving the request, generating a protection instruction to control the power battery to send out a preset interlocking level.
According to a third aspect of the present application, an electric vehicle is provided, which includes the above-mentioned high voltage protection device for an electric vehicle.
Therefore, the input voltage and the output voltage of each high-voltage device in the whole vehicle loop CAN be collected through the CAN network, the input voltage and the output voltage of each high-voltage device are compared, when the interlocking state of each high-voltage device is identified to be a fault state, the high-voltage switch of the whole vehicle loop is disconnected, meanwhile, a fault point is determined based on the high-voltage device in the fault state, fault information is sent to an instrument, the fault point is prompted to a driver, the problem that due to the fact that the loop is abnormally disconnected, maintenance personnel need to check and test each connecting part is solved, the fault problem is solved, high-voltage electric shock accidents are effectively prevented, the safety of the whole vehicle is guaranteed, the fault point is quickly located, and the checking and maintaining efficiency is.
Additional aspects and advantages of the present application 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 present application.
Drawings
The foregoing and/or additional aspects and advantages of the present application will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a high voltage protection method for an electric vehicle according to an embodiment of the present application;
FIG. 2 is a schematic illustration of a vehicle completion loop interlock according to one embodiment of the present application;
FIG. 3 is a schematic diagram of a high voltage device loop interlock voltage detection according to one embodiment of the present application;
FIG. 4 is a flow chart of a method for high voltage protection of an electric vehicle according to an embodiment of the present application;
fig. 5 is a block diagram illustrating an example of a high voltage protection device for an electric vehicle according to an embodiment of the present application.
Detailed Description
Reference will now be made in detail to embodiments of the present application, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present application and should not be construed as limiting the present application.
The high-voltage protection method and device for the electric vehicle and the electric vehicle according to the embodiment of the application are described below with reference to the accompanying drawings. Aiming at the problem that maintenance personnel need to check and test each connection part to check the fault due to abnormal disconnection of the loop, the application provides a high-voltage protection method of an electric automobile, in the method, input voltage and output voltage of each high-voltage device in a finished automobile loop CAN be collected through a CAN network, the input voltage and the output voltage of each high-voltage device are compared, when the interlocking state of each high-voltage device is identified to be the fault state, a high-voltage switch of the finished automobile loop is disconnected, simultaneously, a fault point is determined based on the high-voltage device in the fault state, fault information is sent to an instrument to prompt a driver to the fault point, the problem that the fault is checked due to abnormal disconnection of the loop and the maintenance personnel need to check and test each connection part to effectively prevent high-voltage electric shock accidents, the safety of the whole vehicle is guaranteed, fault points are quickly located, and the inspection and maintenance efficiency is improved.
Specifically, fig. 1 is a schematic flow chart of a high-voltage protection method for an electric vehicle according to an embodiment of the present application.
As shown in fig. 1, the high voltage protection method for the electric vehicle includes the following steps:
in step S101, an input voltage and an output voltage of each high-voltage device in the vehicle loop are collected through the CAN network.
Optionally, in some embodiments, before collecting the input voltage and the output voltage of each high-voltage device in the vehicle loop, the method further includes: receiving a request for completing power-on and self-inspection of the electric automobile; after receiving the request, a protection command is generated to control the power battery to issue a preset interlock level.
It should be understood that the vehicle loop interlock voltage +12V is sent by the power battery, through the high voltage device uncapping protection, the high voltage connection plug, the high voltage device low voltage plug, and received by the last high voltage component, as shown in fig. 2. If any one of the loops is disconnected, the subsequent loop can not receive the +12V interlocking voltage.
Therefore, the embodiment of the application CAN collect the input voltage and the output voltage of each high-voltage device in the loop of the whole vehicle through the CAN network.
In step S102, the input voltage and the output voltage of each high-voltage device are compared, and the interlock state of each high-voltage device is identified.
It can be understood that, as shown in fig. 3, fig. 3 is a schematic diagram of detecting the loop interlock voltage of the high-voltage device, the complete vehicle loop interlock voltage +12V enters each high-voltage device through the low-voltage plug-in and is connected in series with the microswitch for uncapping protection, and enters the input of the next high-voltage device from the output of the low-voltage plug-in. The high-voltage device detects input voltage and output voltage through hardware, converts the input voltage and the output voltage into level signals and inputs the level signals into a Central Processing Unit (CPU), and the CPU judges the input voltage and the output voltage and sends status bits to the vehicle control unit.
As one possible implementation, in some embodiments, identifying the interlock status of each high voltage device includes: if the loop interlocking input is high and the loop interlocking output is high, the interlocking state is a normal state; if the loop interlock input is high and the loop interlock output is low, the interlock status is a fault status.
As another possible implementation manner, in some embodiments, identifying the interlock state of each high-voltage device further includes: if the loop interlock input is low and the loop interlock output is low, the interlock state is an open state.
Specifically, as shown in table 1, table 1 is a schematic diagram of a loop interlocking logic judgment of a high-voltage device, and if a loop interlocking input is high and a loop interlocking output is high, a loop sends a high level to a normal state, and reports that the loop is in a no-problem state to a vehicle controller; if the loop interlocking input is high, the loop interlocking output is low, the loop interlocking at the high-voltage device is disconnected, and the loop interlocking fault of the whole vehicle controller is reported; and if the loop interlocking input is low, the loop interlocking output is low, the upper part of the loop of the high-voltage device is disconnected, and the disconnection of the loop above the high-voltage device is reported.
TABLE 1
In step S103, when the interlock state is a failure state, the high-voltage switch of the entire vehicle loop is turned off, and the failure is detected based on the result
And determining a fault point by the high-voltage device in the fault state, and sending fault information to a preset terminal.
Optionally, in some embodiments, after disconnecting the high-voltage switch of the vehicle loop, the method further includes: and controlling the electric drive system of the electric automobile to work so as to carry out high-pressure discharge.
Specifically, the vehicle control unit in the embodiment of the application receives the loop interlocking state reported by each high-voltage device, judges whether the loop has a problem, disconnects the high-voltage relay and the electric drive system to perform high-voltage discharge if the interlocking state is a fault state, judges a fault point, and sends fault information to the instrument to prompt a driver. Therefore, the fault point is prompted through the instrument, a driver can preliminarily check the problem point, and unnecessary troubles such as a trailer are reduced.
In order to further understand the high voltage protection method of the electric vehicle according to the embodiment of the present application, the following is further described with reference to fig. 4.
As shown in fig. 4, the high voltage protection method for the electric vehicle includes the following steps:
and S401, electrifying the whole vehicle.
S402, the BMS issues a loop interlock high level.
And S403, detecting the loop interlocking input and output level signal by each high-voltage device.
And S404, each high-voltage device sends the detected level signal to the whole vehicle controller through the can network.
S405, the whole vehicle controller judges the loop interlocking disconnection position.
And S406, unloading high voltage of the whole vehicle, and prompting a driver to generate a problem part.
Therefore, the self-checking is completed by electrifying the whole vehicle, the loop interlocking high level +12V is sent out by the power battery controller BMS, the loop interlocking high level passes through the uncovering protection of each high-voltage device, the low-voltage plug-in and the high-voltage connection part, the input and output levels are detected by each high-voltage device controller, and the detected state is sent to the whole vehicle controller through the can network after logical judgment; and the vehicle control unit receives the loop interlocking state of each high-voltage device, judges the loop interlocking of the whole vehicle, instructs the power battery to switch the high-voltage relay and then the electric drive system to actively discharge if the loop of the whole vehicle is disconnected, and sends the judged fault information to the instrument to prompt a driver of a fault point. According to the high-voltage protection method for the electric automobile, the input voltage and the output voltage of each high-voltage device in a whole automobile loop CAN be collected through the CAN network, the input voltage and the output voltage of each high-voltage device are compared, when the interlocking state of each high-voltage device is identified to be a fault state, a high-voltage switch of the whole automobile loop is disconnected, a fault point is determined based on the high-voltage device in the fault state, fault information is sent to an instrument, the fault point is prompted to a driver, the problem that maintenance personnel need to check and test each connecting part to check the fault due to abnormal disconnection of the loop is solved, high-voltage electric shock accidents are effectively prevented, the safety of the whole automobile is guaranteed, the fault point is quickly located, and the checking and maintaining efficiency is improved.
Next, a high voltage protection device for an electric vehicle according to an embodiment of the present application will be described with reference to the drawings.
Fig. 5 is a block diagram schematically illustrating a high-voltage protection device of an electric vehicle according to an embodiment of the present application.
As shown in fig. 5, the high voltage protection device 10 for an electric vehicle includes: an acquisition module 100, an identification module 200 and a control module 300.
The acquisition module 100 is used for acquiring the input voltage and the output voltage of each high-voltage device in the loop of the whole vehicle through a CAN (controller area network);
the identification module 200 is configured to compare the input voltage and the output voltage of each high-voltage device, and identify an interlock state of each high-voltage device; and
the control module 300 is configured to, when the interlock state is the fault state, disconnect a high-voltage switch of a loop of the entire vehicle, determine a fault point based on a high-voltage device in the fault state, and send fault information to a preset terminal.
Optionally, the identification module 200 comprises:
if the loop interlocking input is high and the loop interlocking output is high, the interlocking state is a normal state;
if the loop interlock input is high and the loop interlock output is low, the interlock status is a fault status.
Optionally, the identification module 200 comprises:
if the loop interlock input is low and the loop interlock output is low, the interlock state is an open state.
Optionally, after disconnecting the high-voltage switch of the vehicle loop, the control module further includes:
and controlling the electric drive system of the electric automobile to work so as to carry out high-pressure discharge.
Optionally, before collecting the input voltage and the output voltage of each high-voltage device in the entire vehicle loop, the collecting module 100 further includes:
receiving a request for completing power-on and self-inspection of the electric automobile;
after receiving the request, a protection command is generated to control the power battery to issue a preset interlock level.
It should be noted that the above explanation of the embodiment of the high-voltage protection method for an electric vehicle is also applicable to the high-voltage protection device for an electric vehicle of the embodiment, and is not repeated here.
According to the high-voltage protection device of the electric automobile, the input voltage and the output voltage of each high-voltage device in a whole automobile loop CAN be collected through the CAN network, the input voltage and the output voltage of each high-voltage device are compared, when the interlocking state of each high-voltage device is identified to be a fault state, a high-voltage switch of the whole automobile loop is disconnected, a fault point is determined based on the high-voltage device of the fault state, fault information is sent to an instrument, the fault point is prompted to a driver, the problem that maintenance personnel need to check and test each connecting part due to abnormal disconnection of the loop is solved, the fault problem is solved, high-voltage electric shock accidents are effectively prevented, the safety of the whole automobile is guaranteed, the fault point is quickly located, and the checking and maintaining efficiency is improved.
In addition, this application embodiment has still provided an electric automobile, and this electric automobile includes foretell electric automobile's high voltage protection device.
According to the electric automobile provided by the embodiment of the application, through the high-voltage protection device of the electric automobile, the problem that maintenance personnel need to check and test each connecting part to check the fault due to abnormal disconnection of a loop is solved, high-voltage electric shock accidents are effectively prevented, the safety of the whole automobile is guaranteed, fault points are quickly located, and the checking and maintaining efficiency is improved.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," 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 application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or N embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "N" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more N executable instructions for implementing steps of a custom logic function or process, and alternate implementations are included within the scope of the preferred embodiment of the present application 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 implementing the embodiments of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the N steps or methods may be implemented in software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
Claims (10)
1. A high-voltage protection method of an electric automobile is characterized by comprising the following steps:
acquiring input voltage and output voltage of each high-voltage device in a finished automobile loop through a CAN (controller area network);
comparing the input voltage and the output voltage of each high-voltage device, and identifying the interlocking state of each high-voltage device; and
and when the interlocking state is a fault state, disconnecting a high-voltage switch of the whole vehicle loop, determining a fault point based on a high-voltage device in the fault state, and sending fault information to a preset terminal.
2. The method of claim 1, wherein said identifying the interlock status of each of said high voltage devices comprises:
if the loop interlocking input is high and the loop interlocking output is high, the interlocking state is a normal state;
if the loop interlock input is high and the loop interlock output is low, then the interlock status is a fault status.
3. The method of claim 2, wherein said identifying an interlock status of said each high voltage device further comprises:
if the loop interlock input is low and the loop interlock output is low, then the interlock state is an open state.
4. The method of claim 1, further comprising, after opening a high voltage switch of the vehicle loop:
and controlling the electric drive system of the electric automobile to work so as to carry out high-pressure discharge.
5. The method of claim 1, further comprising, prior to collecting the input voltage and the output voltage of each high voltage device in the vehicle loop:
receiving a request for completing power-on and self-inspection of the electric automobile;
and after receiving the request, generating a protection instruction to control the power battery to send out a preset interlocking level.
6. A high-voltage protection device of an electric vehicle is characterized by comprising:
the acquisition module is used for acquiring the input voltage and the output voltage of each high-voltage device in the loop of the whole vehicle through the CAN network;
the identification module is used for comparing the input voltage and the output voltage of each high-voltage device and identifying the interlocking state of each high-voltage device; and
and the control module is used for disconnecting the high-voltage switch of the whole vehicle loop when the interlocking state is a fault state, determining a fault point based on a high-voltage device in the fault state, and sending fault information to a preset terminal.
7. The apparatus of claim 6, wherein the identification module comprises:
if the loop interlocking input is high and the loop interlocking output is high, the interlocking state is a normal state;
if the loop interlock input is high and the loop interlock output is low, then the interlock status is a fault status.
8. The apparatus of claim 7, wherein the identification module further comprises:
if the loop interlock input is low and the loop interlock output is low, then the interlock state is an open state.
9. The apparatus of claim 6, wherein after opening the high voltage switch of the vehicle loop, the control module further comprises:
and controlling the electric drive system of the electric automobile to work so as to carry out high-pressure discharge.
10. An electric vehicle, comprising: the high voltage protection device for electric vehicles according to any one of claims 6 to 9.
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