CN111196159A - A low-voltage maintenance switch device, control method and vehicle - Google Patents
A low-voltage maintenance switch device, control method and vehicle Download PDFInfo
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- CN111196159A CN111196159A CN202010065281.4A CN202010065281A CN111196159A CN 111196159 A CN111196159 A CN 111196159A CN 202010065281 A CN202010065281 A CN 202010065281A CN 111196159 A CN111196159 A CN 111196159A
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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
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02T90/10—Technologies relating to charging of electric vehicles
- Y02T90/16—Information or communication technologies improving the operation of electric vehicles
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Abstract
本发明公开了一种低压维修开关装置、控制方法及车辆，用于对车辆高压系统回路的维修，所述装置包括电池管理系统、低压电源和控制开关；电池管理系统、低压电源和控制开关形成低压电路，电池管理系统、控制开关和车辆控制器形成高压互锁回路；控制开关用于控制低压电路和高压互锁回路的通断；车辆控制器用于检测车辆高压系统回路的故障信息；电池管理系统用于判断低压电路和/或高压互锁回路的通断情况，并根据通断情况，控制高压继电器闭合或断开，通过设置低压维修开关实现高压系统回路的下电，节约了高压系统回路的装配成本，减少了高压触电事故，在高压系统下电后，通过检测高压回路检测点，检验高压系统是否还有高压电，防止工作人员触电。
The invention discloses a low-voltage maintenance switch device, a control method and a vehicle, which are used for the maintenance of a high-voltage system circuit of a vehicle. The device includes a battery management system, a low-voltage power supply and a control switch; the battery management system, the low-voltage power supply and the control switch form a The low-voltage circuit, the battery management system, the control switch and the vehicle controller form a high-voltage interlock circuit; the control switch is used to control the on-off of the low-voltage circuit and the high-voltage interlock circuit; the vehicle controller is used to detect the fault information of the vehicle high-voltage system circuit; battery management The system is used to judge the on-off condition of the low-voltage circuit and/or the high-voltage interlock circuit, and control the high-voltage relay to close or open according to the on-off condition. By setting the low-voltage maintenance switch, the high-voltage system circuit can be powered off, saving the high-voltage system circuit. After the high-voltage system is powered off, by detecting the high-voltage loop detection point, check whether the high-voltage system still has high-voltage electricity to prevent the staff from being electrocuted.
Description
Technical Field
The invention relates to the technical field of vehicles, in particular to a low-voltage maintenance switch device, a control method and a vehicle.
Background
In order to ensure the personal safety of vehicle maintenance personnel and prevent high-voltage electric shock accidents during vehicle maintenance, a mechanical maintenance switch is mostly adopted by new energy vehicles in the market at present to ensure the reliable disconnection of a high-voltage loop, as shown in fig. 1, the mechanical maintenance switch comprises a plug and a socket, the mechanical maintenance switch is used as a current-carrying component and is connected in series in the high-voltage loop, after the plug of the maintenance switch is pulled down, the high-voltage loop is disconnected, at the moment, the personnel touch a non-energy-storage component of the high-voltage system, and no electric shock risk exists. Therefore, the mechanical maintenance switch has the advantages of fine structure, larger volume, complex operation, larger requirements on arrangement space and assembly space, higher cost and weight, and is not beneficial to the requirements on arrangement of the whole vehicle and reduction of the cost of the whole vehicle. This is undoubtedly contrary to the development trend of high driving range, low cost target and compact arrangement of the current new energy vehicles. At present, new energy vehicles on the market mostly adopt mechanical maintenance switch assemblies, need large assembly space and operation space, are also high in weight and cost, and are not favorable for the targets of whole vehicle arrangement, low cost and high endurance.
Disclosure of Invention
In view of the above problems in the prior art, an object of the present invention is to provide a low voltage maintenance switch device, a control method and a vehicle, which can solve the problems of high cost, heavy weight, large occupied space and the like of the maintenance switch in the prior art.
In order to solve the technical problems, the specific technical scheme of the invention is as follows:
in one aspect, the present invention provides a low voltage maintenance switching device for maintenance of a high voltage system loop of a vehicle, the high voltage system loop including a high voltage relay and a high voltage power supply, the device including a battery management system, a low voltage power supply and a control switch; the battery management system, the low-voltage power supply and the control switch form a low-voltage circuit, and the battery management system, the control switch and the vehicle controller form a high-voltage interlocking loop;
the control switch is used for controlling the on-off of the low-voltage circuit and the high-voltage interlocking loop;
the vehicle controller is used for detecting fault information of a vehicle high-voltage system loop;
the battery management system is used for judging the on-off condition of the low-voltage circuit and/or the high-voltage interlocking loop and controlling the high-voltage relay to be switched on or switched off according to the on-off condition.
Further, the high voltage relay includes a first high voltage relay, a second high voltage relay, and a third high voltage relay; the first high-voltage relay is connected in series at the positive end of the high-voltage power supply, the second high-voltage relay is connected in series at the negative end of the high-voltage power supply, and the third high-voltage relay is connected in parallel with the first high-voltage relay.
Further, the device also comprises a detection port, and the detection port is used for detecting the voltage information of the high-voltage relay port.
Further, the detection ports comprise a first detection port, a second detection port and a third detection port;
the first detection port is used for detecting the voltage of the output end of the first high-voltage relay;
the second detection port is used for detecting the voltages of the input ends of the second high-voltage relay and the third high-voltage relay;
the third detection port is used for detecting the voltage of the output ends of the second high-voltage relay and the third high-voltage relay.
Further, the states of the control switch include a closed state and an open state;
when the control switch is in a closed state, the low-voltage circuit and the high-voltage interlocking loop are in a communicated state, the battery management system is in a working state, and the first high-voltage relay and the second high-voltage relay are controlled to be closed;
when the control switch is in an off state, the low-voltage circuit and the high-voltage interlocking loop are in an off state, and the battery management system is in a non-working state, so that signals between the first high-voltage relay and the second high-voltage relay and the battery management system are disconnected, and the first high-voltage relay and the second high-voltage relay are disconnected.
Optionally, the control switch includes a plug and a socket, the plug is internally provided with a short-circuit terminal, the socket is internally provided with a low-voltage wire connection terminal, and the short-circuit terminal and the connection terminal are connected to communicate the low-voltage circuit and the high-voltage interlock loop.
On the other hand, based on the low voltage maintenance switchgear provided above, the present invention also provides a control method of the low voltage maintenance switchgear, the method comprising the steps of:
the vehicle controller acquires fault information of the high-voltage system and judges whether high-voltage parts need to be checked or not;
when the high-voltage parts need to be replaced, vehicle personnel turn off the control switch;
detecting voltage information of a port of the high-voltage relay;
judging whether the voltage information is higher than a preset voltage threshold value or not;
and if the voltage information is not higher than the preset voltage threshold value, checking the high-voltage parts.
Further, after the determining whether the voltage information is lower than a preset voltage threshold, the method further includes:
if the voltage information is higher than the preset voltage threshold, detecting the voltage information of the port of the high-voltage relay again after preset time until the voltage information is not higher than the preset voltage threshold.
Further, the detecting the voltage information of the high-voltage relay port includes:
detecting the voltage of the output end of the first high-voltage relay through the first detection port;
detecting voltages at input ends of the second high-voltage relay and the third high-voltage relay through the second detection port;
the third detection port is used for detecting the voltage of the output ends of the second high-voltage relay and the third high-voltage relay
In a third aspect, the invention also provides a vehicle comprising a low voltage service switching device as described above.
By adopting the technical scheme, the low-voltage maintenance switch device, the control method and the vehicle have the following beneficial effects that:
1. according to the low-voltage maintenance switch device, the control method and the vehicle, the maintenance switch is prevented from being used as a high-voltage current-carrying component to be connected in series in a high-voltage system loop, the assembly cost of the high-voltage system loop is saved, and the assembly efficiency is improved.
2. According to the low-voltage maintenance switch device, the control method and the vehicle, the low-voltage maintenance switch is arranged, the power-off of the high-voltage system loop is realized through the control of the low-voltage maintenance switch, the safety and the reliability are realized, and the high-voltage electric shock accidents are reduced.
3. According to the low-voltage maintenance switch device, the control method and the vehicle, after the high-voltage system is powered off, whether the high-voltage loop of the high-voltage system has high voltage or not can be checked through detecting the detection point of the high-voltage loop, and a maintenance worker is prevented from getting an electric shock.
4. The low-voltage maintenance switch device, the control method and the vehicle are simple in structure, low in cost and small in size.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description of the embodiment or the prior art will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
FIG. 1 is a schematic circuit diagram of a prior art service switch;
FIG. 2 is a schematic circuit diagram of a low voltage service switching device according to one embodiment of the present disclosure;
FIG. 3 is a schematic circuit diagram of a low voltage service switching device according to one embodiment of the present disclosure;
FIG. 4 is a step diagram of a method of controlling a low voltage service switchgear in accordance with the present invention;
fig. 5 is a flow chart of the operation of the low voltage service switchgear in the embodiment of the present description.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the invention described herein are capable of operation in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, apparatus, article, or device that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or device.
Example 1
In the prior art, when a vehicle high-voltage system loop breaks down, in order to prevent high-voltage electric shock accidents during vehicle maintenance, a mechanical maintenance switch is usually adopted and is used as a current-carrying component to be connected in series in the high-voltage system loop, so that the complexity of high-voltage system loop connection is increased, meanwhile, a larger assembly space and a larger operation space are required, the weight and the cost are also higher, and the aims of whole vehicle arrangement, low cost and high endurance are not facilitated.
The embodiment of the specification provides a low-voltage maintenance switch device, which can be used for maintaining a high-voltage system loop of a vehicle at any time, and particularly, when the high-voltage system loop breaks down and needs to be replaced, the high-voltage system loop can be powered off through the low-voltage maintenance switch device, so that electric shock hazard generated when a worker checks and maintains the high-voltage component is avoided.
The high-voltage system loop provides a high-voltage environment through a high-voltage power supply (beta), so that high-voltage components can normally work, such as a driving Motor (Motor) and a Motor controller (Inverter), and on-off of the high-voltage environment is controlled through a high-voltage Relay (Relay), wherein the high-voltage Relay is an electronic control device, and when the change of the input quantity (excitation quantity) of the high-voltage circuit meets the specified requirement, the controlled quantity of the electric appliance is subjected to preset step change in an electric output circuit.
In the embodiment of the present specification, please refer to fig. 2, the low voltage maintenance switching device includes a battery management system, a low voltage power supply and a control switch; the Battery Management System (BMS), the low voltage power supply and the control switch form a low voltage circuit, such as a KL15 electrical loop, and the battery management system, the control switch and the vehicle controller form a high voltage interlock loop, such as an HVIL high voltage interlock loop; the control switch is used for controlling the on-off of the low-voltage circuit and the high-voltage interlocking loop;
the vehicle controller is used for detecting fault information of a vehicle high-voltage system loop;
the battery management system is used for judging the on-off condition of the low-voltage circuit and/or the high-voltage interlocking loop and controlling the high-voltage relay to be switched on or switched off according to the on-off condition. .
The low-voltage power supply can be a 12V storage battery and provides electric energy for the battery management system, the battery management system is further provided with a connection port which can control the power supply condition of the coil winding in the high-voltage relay, for example, when the battery management system cuts off the power supply of the coil winding of the high-voltage relay, the high-voltage relay is equivalently disconnected, and therefore the loop of the high-voltage system is powered down. When the battery management system is communicated with the power supply of the coil winding of the high-voltage relay, the high-voltage relay is closed again, and therefore the high-voltage system loop is electrified.
In this specification, the control switch may be a plug and a socket, the plug is internally provided with a short-circuit terminal, the socket is internally provided with a low-voltage line connection terminal, and the short-circuit terminal and the connection terminal are connected to communicate the low-voltage circuit and the high-voltage interlock loop.
When the plug is connected with the socket, the control switch is in a closed state, the low-voltage circuit and the high-voltage interlocking loop are in a communicated state, the battery management system is in a working state, and the first high-voltage relay and the second high-voltage relay are controlled to be closed;
when the plug and the socket are not connected, the control switch is in an off state, the low-voltage circuit and the high-voltage interlocking loop are in an off state, and the battery management system is in a non-working state, so that signals between the first high-voltage relay and the second high-voltage relay and the battery management system are disconnected, and the first high-voltage relay and the second high-voltage relay are disconnected.
By connecting the control switch in a low voltage power supply, such as a 12V battery, the control switch can be controlled in a low voltage environment, so that it does not require too much assembly space and cost, improves the assembly efficiency, and also reduces the connection of the high voltage system loop line, while the BMS also controls the high voltage relay in a low voltage environment.
It should be noted that the control switch may be a plurality of control components, for example, two sets of plugs and sockets may be provided, which are respectively a first set of switches and a second set of switches, where the first set of switches controls the low-voltage circuit, and the second set of switches controls the high-voltage interlock loop, and of course, when the first set of switches is turned off, the low-voltage power supply is automatically powered off, and the high-voltage interlock loop is also automatically turned off.
In some embodiments, a plug protection device can be arranged beside the socket to avoid the false touch of the plug and the socket when a worker maintains the socket.
In some embodiments, referring to fig. 3, in order to avoid injury to workers due to a residual high-voltage environment after the high-voltage relay is disconnected, a detection port may be further provided, and the detection port may detect voltage information of the connection port of the high-voltage relay.
A plurality of high-voltage relays, such as a first high-voltage Relay (Relay1), a second high-voltage Relay (Relay2) and a third high-voltage Relay (Relay3), may be arranged in the high-voltage system loop; the first high-voltage Relay (Relay1) is connected in series at the positive terminal of the high-voltage power supply, the second high-voltage Relay (Relay2) is connected in series at the negative terminal of the high-voltage power supply, and the third high-voltage Relay (Relay3) and the first high-voltage Relay (Relay1) are connected in parallel.
Correspondingly, the detection port can also be provided with a first detection port (HV1), a second detection port (HV2) and a third detection port (HV 3); the first detection port is used for detecting the voltage of the output end of the first high-voltage relay; the second detection port is used for detecting the voltages of the input ends of the second high-voltage relay and the third high-voltage relay; the third detection port is used for detecting the voltage of the output ends of the second high-voltage relay and the third high-voltage relay.
Alternatively, the voltage of the detection port can be measured by a test pencil, so that the efficiency and convenience of detection can be improved.
Wherein, the chinese explanation of the english terms of the components in fig. 1 to 3 is as follows:
table 1: english term abbreviation for vehicle parts
| English abbreviation | English full scale | Chinese full scale |
| battery | / | High voltage battery |
| BMS | Battery management system | Battery management system |
| Motor | / | Driving motor |
| Inverter | / | Motor controller |
| 12V battery | / | Low-voltage accumulator |
| Relay1/Relay2/Relay3 | HV contactors | High-voltage relay |
On the basis of the low-voltage maintenance switch device, the embodiment of the specification also provides a control method of the low-voltage maintenance switch device, and the specification provides the operation steps of the method according to the embodiment, but is based on the conventional method; or the inventive process may include additional or fewer steps. In the embodiment, the step sequence is only one of the execution sequences of the steps, and does not represent the only execution sequence, and a control method of the low voltage maintenance switching device, please refer to fig. 4 and 5, which specifically includes:
s1: the method comprises the steps that a vehicle controller obtains fault information of a high-voltage system, and judges whether high-voltage parts need to be checked or not according to the fault information;
when the vehicle has a fault, particularly when the high-voltage system circuit has a fault, the vehicle cannot be started and run normally, and the vehicle controller can display the fault information and information such as whether high-voltage parts need to be replaced on the instrument by obtaining the fault information of the high-voltage system.
S2: when the high-voltage parts need to be checked, vehicle personnel turn off the control switch;
under the premise of the fault information, when the high-voltage parts need to be checked and particularly need to be replaced, high-voltage low-voltage power supply is needed, vehicle personnel or workers disconnect a control switch, specifically, the plug can be pulled down, so that the plug and the socket are disconnected, a low-voltage circuit and a high-voltage interlocking circuit are disconnected, when the battery management system is disconnected from a power supply, a control signal between the battery management system and the high-voltage relay is also disconnected, namely, the power supply of a coil winding of the high-voltage relay is cut off, and then the first high-voltage relay and the second high-voltage relay are disconnected, so that the whole high-voltage system circuit is powered off successfully.
S3: detecting voltage information of a high-voltage relay connection port;
the voltage of the output end of the first high-voltage relay, the voltage of the output end of the second high-voltage relay and the voltage of the input end of the third high-voltage relay, the voltage of the output end of the second high-voltage relay and the voltage of the output end of the third high-voltage relay can be directly measured through the test pencil, the voltage condition in a real-time high-voltage system can be obtained through the voltage condition, and electric shock high-voltage residue after power off is avoided.
S4: judging whether the voltage information is higher than a preset voltage threshold value or not;
the preset voltage threshold value can be a safe voltage value which can be borne by a human body, for example, 10V, and when the measured voltage value is not higher than 10V, the high-voltage system is safe in environment and can be detached for maintenance.
S5: and when the voltage information is not higher than the preset voltage threshold value, checking the high-voltage part.
When the voltage information is in the safe environment range, a worker can directly disconnect the high-voltage parts to connect the wiring harness, the pipeline, the bolt and the like, and then take down the high-voltage parts with faults for inspection.
After the maintenance is completed, the high-voltage system circuit can be operated again after the control switch is closed.
In addition, in the embodiment of the specification, a vehicle is further provided, the vehicle comprises the low-voltage maintenance switch device, and the control method is executed.
The low-voltage maintenance switch device, the control method and the vehicle have the following beneficial effects that:
1) according to the low-voltage maintenance switch device, the control method and the vehicle, the maintenance switch is prevented from being used as a high-voltage current-carrying component to be connected in series in a high-voltage system loop, the assembly cost of the high-voltage system loop is saved, and the assembly efficiency is improved.
2) According to the low-voltage maintenance switch device, the control method and the vehicle, the low-voltage maintenance switch is arranged, the power-off of the high-voltage system loop is realized through the control of the low-voltage maintenance switch, the safety and the reliability are realized, and the high-voltage electric shock accidents are reduced.
3) According to the low-voltage maintenance switch device, the control method and the vehicle, after the high-voltage system is powered off, whether the high-voltage loop of the high-voltage system has high voltage or not can be checked through detecting the detection point of the high-voltage loop, and a maintenance worker is prevented from getting an electric shock.
4) The low-voltage maintenance switch device, the control method and the vehicle are simple in structure, low in cost and small in size.
While the invention has been described with reference to specific embodiments, it will be appreciated by those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the invention can be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (10)
1. A low voltage maintenance switching device for maintenance of a high voltage system circuit of a vehicle, said high voltage system circuit including a high voltage relay and a high voltage power supply, said device comprising a battery management system, a low voltage power supply and a control switch; the battery management system, the low-voltage power supply and the control switch form a low-voltage circuit, and the battery management system, the control switch and the vehicle controller form a high-voltage interlocking loop;
the control switch is used for controlling the on-off of the low-voltage circuit and the high-voltage interlocking loop;
the vehicle controller is used for detecting fault information of a vehicle high-voltage system loop;
the battery management system is used for judging the on-off condition of the low-voltage circuit and/or the high-voltage interlocking loop and controlling the high-voltage relay to be switched on or switched off according to the on-off condition.
2. The low voltage service switchgear of claim 1, wherein the high voltage relay comprises a first high voltage relay, a second high voltage relay, and a third high voltage relay; the first high-voltage relay is connected in series at the positive end of the high-voltage power supply, the second high-voltage relay is connected in series at the negative end of the high-voltage power supply, and the third high-voltage relay is connected in parallel with the first high-voltage relay.
3. The low voltage service switching device of claim 2, further comprising a detection port for detecting voltage information of the high voltage relay connection port.
4. The low voltage service switchgear of claim 3, wherein the detection port comprises a first detection port, a second detection port, and a third detection port;
the first detection port is used for detecting the voltage of the output end of the first high-voltage relay;
the second detection port is used for detecting the voltages of the input ends of the second high-voltage relay and the third high-voltage relay;
the third detection port is used for detecting the voltage of the output ends of the second high-voltage relay and the third high-voltage relay.
5. The low voltage service switchgear of claim 2, wherein the states of the control switch include a closed state and an open state;
when the control switch is in a closed state, the low-voltage circuit and the high-voltage interlocking loop are in a communicated state, the battery management system is in a working state, and the first high-voltage relay and the second high-voltage relay are controlled to be closed;
when the control switch is in an off state, the low-voltage circuit and the high-voltage interlocking loop are in an off state, and the battery management system is in a non-working state, so that signals between the first high-voltage relay and the second high-voltage relay and the battery management system are disconnected, and the first high-voltage relay and the second high-voltage relay are disconnected.
6. A low voltage service switching device according to claim 5, wherein said control switch includes a plug and a socket, said plug having a shorting terminal built therein, said socket having a low voltage line connecting terminal built therein, said shorting terminal and said connecting terminal being connected to communicate said low voltage circuit with said high voltage interlock loop.
7. A control method of a low voltage service switchgear for controlling a low voltage service switchgear according to any of claims 1 to 6, characterized in that it comprises:
the method comprises the steps that a vehicle controller obtains fault information of a high-voltage system, and judges whether high-voltage parts need to be checked or not according to the fault information;
when the high-voltage parts need to be checked, vehicle personnel turn off the control switch;
detecting voltage information of a high-voltage relay connection port;
judging whether the voltage information is higher than a preset voltage threshold value or not;
and when the voltage information is not higher than the preset voltage threshold value, checking the high-voltage part.
8. The method of claim 7, wherein the determining whether the voltage information is below a predetermined voltage threshold further comprises:
and when the voltage information is higher than the preset voltage threshold, detecting the voltage information of the port of the high-voltage relay again after preset time until the voltage information is not higher than the preset voltage threshold.
9. The control method of the low voltage service switching device of claim 7, wherein the detecting the voltage information of the high voltage relay port comprises:
detecting the voltage of the output end of the first high-voltage relay through the first detection port;
detecting the voltages of the input ends of the second high-voltage relay and the third high-voltage relay through the second detection port;
and the third detection port is used for detecting the voltage of the output ends of the second high-voltage relay and the third high-voltage relay.
10. A vehicle, characterized in that it comprises a low-voltage service switching device according to any one of claims 1 to 6.
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| CN202010065281.4A CN111196159A (en) | 2020-01-20 | 2020-01-20 | A low-voltage maintenance switch device, control method and vehicle |
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