CN112721642A - Power-off method and system for prolonging service life of relay of whole vehicle - Google Patents
Power-off method and system for prolonging service life of relay of whole vehicle Download PDFInfo
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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
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
Abstract
The invention provides a power-off method and a power-off system for prolonging the service life of a finished automobile relay, wherein the method comprises the following steps: acquiring high-voltage power-off request information of a high-voltage loop; when a high-voltage low-voltage request is detected, the first relay is controlled to be switched off, then the second relay is controlled to be switched off, and meanwhile a first load working condition is obtained; judging whether the switching-off sequence of the relay is required to be switched when the next high-voltage power-off is carried out according to the acquired first load working condition; when the switching-off sequence of the relays is judged to be required to be switched, and the high-voltage power-down request is obtained again, the second relay is controlled to be switched off, then the first relay is controlled to be switched off to complete the high-voltage power-down operation instruction, and meanwhile a second load-carrying working condition is obtained; and judging whether the relay cutting-off sequence needs to be switched when the next high-voltage power-off process is carried out according to the obtained second load working condition. The power-off method for prolonging the service life of the relay of the whole vehicle realizes the purpose of utilizing the design service life of the relay to the maximum extent, realizes the simultaneous replacement of two relays and reduces the maintenance times and the time interval.
Description
Technical Field
The invention relates to the field, in particular to a power-off method and a power-off system for prolonging the service life of a relay of a whole vehicle.
Background
The high-voltage relay is the high-voltage switch device who connects power battery and whole car electrical apparatus, at high-voltage electricity in-process, generally can residual current in the high-voltage circuit, and during the disconnection relay, the relay can have the operating mode that the area carried and cut off, and the area carried cuts off the life that can influence the relay, and the area carried current is big more, and the injury that the relay bore is big more, just also big more to life's influence.
There will be main positive relay, main negative relay in the high-pressure loop, when the high pressure disconnection, there are three kinds of relay disconnection chronogenesis: firstly, disconnecting a main negative relay and then disconnecting a main positive relay; secondly, disconnecting the main positive relay and then disconnecting the main negative relay; and thirdly, simultaneously disconnecting the main positive relay and the main negative relay. Under the first condition and the second condition, the damage borne by the relay which is firstly disconnected is the largest, and the damage borne by the relay which is then disconnected is avoided, so that the service lives of the two relays are asynchronous, and one relay enters a maintenance state because of reaching the design life in advance, thereby bringing great troubles to the maintenance of a vehicle and the subsequent replacement of a high-voltage relay; under the third kind of circumstances, two relays bear the injury simultaneously, and the injury respectively bears 1/2 in theory, nevertheless under the asynchronous and not right circumstances such as the actual injury of driven, also can lead to two relays to be asynchronous equally, can lead to relay design life to arrive in advance simultaneously, inconvenient follow-up maintenance and change, even to the injury of relay not can not carry out concrete evaluation.
Disclosure of Invention
The invention aims to overcome the defects of the background technology and provides a power-off method and a power-off system for prolonging the service life of a relay of a whole vehicle.
In a first aspect, the invention provides a power-off method for prolonging the service life of a finished automobile relay, which comprises the following steps:
acquiring high-voltage power-off request information of a high-voltage loop;
when a high-voltage power-down request is detected, controlling a first relay to be disconnected, then controlling a second relay to be disconnected to complete a high-voltage power-down operation instruction, and simultaneously acquiring a first load working condition of the first relay;
judging whether the switching-off sequence of the relay is required to be switched when the next high-voltage power-off is carried out according to the acquired first load working condition;
when the switching-off sequence of the relays is judged to be required to be switched, and the high-voltage power-down request is obtained again, the second relay is controlled to be switched off, then the first relay is controlled to be switched off to complete the high-voltage power-down operation instruction, and meanwhile, a second load-carrying working condition of the second relay is obtained;
and judging whether the switching-off sequence of the relay is required to be switched when the next high-voltage power-off is carried out according to the acquired second load-carrying working condition.
According to the first aspect, in a first possible implementation manner of the first aspect, the first relay is a main positive relay, and the second relay is a main negative relay.
According to the first aspect, in a second possible implementation manner of the first aspect, the first on-load condition includes a first off-current and a first on-load off-time;
the step of judging whether the switching-off sequence of the relay needs to be switched or not when the next high-voltage power-off is carried out according to the acquired first load working condition comprises the following steps:
obtaining a first equivalent life time of the first relay according to the obtained first load cut-off time and the obtained first cut-off current;
acquiring a first switching equivalent life time threshold;
and when the first equivalent life time and the first switching equivalent life time threshold are detected, judging that the switching-off sequence of the relays needs to be switched.
According to the first aspect, in a third possible implementation manner of the first aspect, the step of obtaining the first equivalent life time of the first relay according to the obtained first load cut-off time and the obtained first cut-off current specifically includes the following steps:
acquiring a first corresponding mapping table of a first cut-off current, a first equivalent single reduced life time and a first on-load cut-off time of a first relay;
and obtaining the first equivalent life time of the first relay according to the obtained first cut-off current, the first load cut-off time and the first corresponding mapping table.
In a fourth possible implementation manner of the first aspect, the second load condition includes a second cut-off current and a second load cut-off number,
the step of judging whether the switching-off sequence of the relay needs to be switched or not when the next high-voltage power-off is carried out according to the obtained second load working condition comprises the following steps:
obtaining a second equivalent life time of the second relay according to the obtained second on-load cut-off time and the second cut-off current;
acquiring a second switching equivalent life time threshold;
and when the second equivalent life time and the second switching equivalent life time threshold are detected, judging the switching-off sequence of the relay needing to be switched.
According to the first aspect, in a fifth possible implementation manner of the first aspect, the step of "obtaining a second equivalent lifetime number of the second relay according to the obtained second load cut-off number and the second cut-off current" specifically includes the following steps:
acquiring a second corresponding mapping table of a second cut-off current, a second equivalent life time and a second on-load cut-off time of a second relay;
and obtaining the second equivalent life time of the second relay according to the obtained second cut-off current, the second on-load cut-off time and the second corresponding mapping table.
According to the first aspect, in a sixth possible implementation manner of the first aspect, after the step of "determining whether to switch the switching-off sequence of the relay when the next high-voltage power supply is cut off according to the acquired first loaded operating condition", the method further includes the following steps:
and when the acquired current value of the first load current of the first relay exceeds a preset load cut-off current safety threshold, executing an operation instruction for switching the turn-off sequence of the relay.
According to the first aspect, in a seventh possible implementation manner of the first aspect, after the step of "determining whether to switch the switching sequence of the relay when the next high-voltage power down is performed according to the acquired first loaded operating condition", the method further includes the following steps:
comparing the current value of the first load current of the first relay with a preset safe cut-off current threshold value;
and when the current value of the first load current is detected to exceed the preset safety cut-off current threshold value, controlling to execute a cut-off sequence operation instruction of the switching relay.
According to the first aspect, in an eighth possible implementation manner of the first aspect, the preset safe cut-off current threshold is 400A.
The invention provides a power-down system for prolonging the service life of a finished automobile relay, which comprises a detection module, a first control module, a first acquisition module, a first judgment module, a second control module, a second acquisition module and a second judgment module, wherein the detection module is used for acquiring high-voltage power-down request information of a high-voltage loop; the first control module is in communication connection with the detection module and is used for controlling the first relay to be disconnected and then controlling the second relay to be disconnected to complete a high-voltage power-down operation instruction when a high-voltage power-down request is detected; the first acquisition module is in communication connection with the first control module and is used for acquiring a first load working condition of the first relay; the first judgment module is in communication connection with the first acquisition module and is used for judging whether the switching-off sequence of the relay needs to be switched when the next high-voltage power-off process is carried out according to the acquired first load working condition; the second control module is in communication connection with the first judgment module and is used for controlling the second relay to be disconnected and then controlling the first relay to be disconnected to complete the high-voltage power-down operation instruction when the switching-off sequence of the relays is judged to need to be switched and the high-voltage power-down request is obtained again; the second acquisition module is in communication connection with the second control module and is used for acquiring a second loading working condition of the second relay; and the second judgment module is in communication connection with the second acquisition module and is used for judging whether the switching-off sequence of the relay needs to be switched when the next high-voltage power-off according to the acquired second load-carrying working condition.
In a third aspect, the present invention provides a storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements a power-down method for extending the lifetime of a vehicle relay as claimed in any one of claims 1 to 8.
Compared with the prior art, the invention has the following advantages:
according to the power-down method for prolonging the service life of the finished automobile relay, when a power-down request of high voltage is detected, a high-voltage power-down operation instruction is completed by firstly controlling the first relay to be switched off and then controlling the second relay to be switched off, whether the switching sequence of the relays needs to be switched during next high-voltage power-down is judged according to the first load working condition of the first relay which is switched off preferentially after power-down, and the steps are repeated, so that the design service life of the relays is utilized to the maximum extent, the cost brought by replacing the relays is effectively reduced, two relays are replaced simultaneously during final replacement and maintenance of the automobile relay, and the times and time intervals of maintenance of the relays are reduced.
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FIG. 1 is a schematic flow chart of a method of an embodiment of the present invention;
FIG. 2 is another method flow diagram of an embodiment of the present invention;
fig. 3 is a functional block diagram of an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings. While the invention will be described in conjunction with the specific embodiments, it will be understood that they are not intended to limit the invention to the embodiments described. On the contrary, it is intended to cover alternatives, modifications, and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims. It should be noted that the method steps described herein may be implemented by any functional block or functional arrangement, and that any functional block or functional arrangement may be implemented as a physical entity or a logical entity, or a combination of both.
In order that those skilled in the art will better understand the present invention, the following detailed description of the invention is provided in conjunction with the accompanying drawings and the detailed description of the invention.
Note that: the example to be described next is only a specific example, and does not limit the embodiments of the present invention necessarily to the following specific steps, values, conditions, data, orders, and the like. Those skilled in the art can, upon reading this specification, utilize the concepts of the present invention to construct more embodiments than those specifically described herein.
Referring to fig. 1, an embodiment of the present invention provides a power-off method and system for prolonging a service life of a vehicle relay, including the following steps:
s100, acquiring high-voltage power-off request information of a high-voltage loop;
s200, when a high-voltage power-down request is detected, controlling a first relay to be disconnected, then controlling a second relay to be disconnected to complete a high-voltage power-down operation instruction, and meanwhile obtaining a first load working condition of the first relay;
s300, judging whether the switching-off sequence of the relay is required to be switched when the next high-voltage power-off is carried out according to the acquired first load working condition;
s400, when the switching-off sequence of the relays is judged to be required to be switched, and the high-voltage power-down request is obtained again, the second relay is controlled to be switched off, then the first relay is controlled to be switched off to complete the high-voltage power-down operation instruction, and meanwhile, a second load-carrying working condition of the second relay is obtained;
and S500, judging whether the switching-off sequence of the relay is required to be switched when the next high-voltage power-off is carried out according to the acquired second load-carrying working condition.
According to the power-down method for prolonging the service life of the finished automobile relay, when a power-down request of high voltage is detected, a high-voltage power-down operation instruction is completed by firstly controlling the first relay to be switched off and then controlling the second relay to be switched off, whether the switching sequence of the relays needs to be switched during next high-voltage power-down is judged according to the first load working condition of the first relay which is switched off preferentially after power-down, and the steps are repeated, so that the design service life of the relays is utilized to the maximum extent, the cost brought by replacing the relays is effectively reduced, two relays are replaced simultaneously during final replacement and maintenance of the automobile relay, and the times and time intervals of maintenance of the relays are reduced.
In one embodiment, the first relay is a main positive relay, the second relay is a main negative relay, and since a line between the main positive relay and the main negative relay is long, the line between the main positive relay and the main negative relay may contact the ground or a vehicle shell to cause a short circuit when one of the relays is switched off under load, but the main positive relay is relatively close to the positive pole of the battery, the probability that the line in front of the main positive relay is short to contact the ground is very small, and the short circuit condition caused by the short circuit of the line behind the main positive relay to the ground cannot occur.
Referring to fig. 2, in an embodiment, the first on-load condition includes a first off-current and a first on-load off-time; the step of judging whether the switching-off sequence of the relay needs to be switched or not when the next high-voltage power-off is carried out according to the acquired first load working condition comprises the following steps:
obtaining a first equivalent life time of the first relay according to the obtained first load cut-off time and the obtained first cut-off current;
acquiring a first switching equivalent life time threshold;
and when the first equivalent life time and the first switching equivalent life time threshold are detected, judging that the switching-off sequence of the relays needs to be switched.
In an embodiment, when the first high voltage is dropped, when it is detected that the first equivalent life time is lower than half of the equivalent life of the first relay, that is, the first switching equivalent life time threshold is half of the equivalent life of the first relay, it is determined that the next high voltage is dropped, the switching-off sequence of the relays needs to be switched.
In some embodiments, the step of obtaining the first equivalent life time of the first relay according to the obtained first load cut-off time and the obtained first cut-off current includes the following steps:
obtaining a first corresponding mapping table of a first cut-off current, a first equivalent single reduced life time and a first on-load cut-off time of a first relay, as shown in table 1;
and obtaining the first equivalent life time of the first relay according to the obtained first cut-off current, the first load cut-off time and the first corresponding mapping table.
TABLE 1 mapping table of correspondence of first off-current, first equivalent single reduced life and first number of on-load off-times
In table 1, when the load cut-off current of the first relay is between 10A and 50A, maximum value processing or equivalent single-pass reduced life estimation using interpolation may be performed.
In one embodiment, the first on-load cutoff current, the first equivalent single-conversion lifetime, and the first on-load cutoff number are subjected to parameter conversion according to a formula one to obtain a first equivalent lifetime number:
N1restand N1-1A-3B-25C-40D-65E-200F formula I, wherein N is the designed service life cut-off times of the relay.
In one embodiment, the first relay to open at the first high voltage is the main positive relay with a first number of equivalent lives after the first high voltage is N1rest1/4N, when it is lower than the first switching equivalent life time threshold value, the service life of the main and negative relays is N2restN2- (a + B + C + D + E + F + G …) formula two, where N2 is the design life of the second relay.
In one embodiment, the second load condition comprises a second cut-off current and a second load cut-off number,
the step of judging whether the switching-off sequence of the relay needs to be switched or not when the next high-voltage power-off is carried out according to the obtained second load working condition comprises the following steps:
obtaining a second equivalent life time of the second relay according to the obtained second on-load cut-off time and the second cut-off current;
acquiring a second switching equivalent life time threshold;
and when the second equivalent life time and the second switching equivalent life time threshold are detected, judging the switching-off sequence of the relay needing to be switched.
In an embodiment, the step of obtaining the second equivalent lifetime number of the second relay according to the obtained second on-load cutoff number and the second cutoff current includes the following steps:
acquiring a second corresponding mapping table of a second cut-off current, a second equivalent life time and a second on-load cut-off time of a second relay, as shown in table 2;
and obtaining the second equivalent life time of the second relay according to the obtained second cut-off current, the second on-load cut-off time and the second corresponding mapping table.
TABLE 2 mapping tables corresponding to second cutoff currents, second equivalent single-turn lifetimes, and second on-load cutoff times
In one embodiment, when the relay which is preferentially opened is the main negative relay during the first high voltage reduction, the second equivalent life time of the main negative relay after the first high voltage reduction is N2restThe third formula is N2- (1A 1+ 3B 1+ 25C 1+ 40D 1+ 65E 1+ 200F 1), wherein N2 is the design life of the second relay, and when the second equivalent life time of the main negative relay is lower than the second switching equivalent life time threshold after the first high-voltage is pressed down, the service life of the main positive relay is N1restN2- (a1+ B1+ C1+ D1+ E1+ F1 …) formula four, where N2 is the design life of the second relay.
In one embodiment, when N2restWhen 1/4N is reached, the next time the television is switched on at high voltage, the switching off sequence of the relays is switched.
In an embodiment, when the second high voltage is dropped, when it is detected that the second equivalent life time is lower than half of the equivalent life of the second relay, that is, the second switching equivalent life time threshold is half of the equivalent life of the second relay, it is determined that the next high voltage is dropped, the switching-off sequence of the relays needs to be switched.
In an embodiment, after the step of "determining whether to switch the switching sequence of the relay when the next high voltage is cut off according to the obtained first load condition", the method further includes the following steps:
when the acquired current value of the first load current of the first relay exceeds a preset load cut-off current safety threshold value, executing an operation instruction for switching the turn-off sequence of the relay,
in one embodiment, the preset safe cut-off current threshold is 400A.
In a second aspect, please refer to fig. 3, the invention provides a power down system for prolonging the service life of a relay of a whole vehicle, which includes a detection module 100, a first control module 200, a first obtaining module 300, a first judging module 400, a second obtaining module 600, a second judging module 500, and a second control module 700. The detection module is used for acquiring high-voltage power-off request information of the high-voltage loop; the first control module is in communication connection with the detection module and is used for controlling the first relay to be disconnected and then controlling the second relay to be disconnected to complete a high-voltage power-down operation instruction when a high-voltage power-down request is detected; the first acquisition module is in communication connection with the first control module and is used for acquiring a first load working condition of the first relay; the first judgment module is in communication connection with the first acquisition module and is used for judging whether the switching-off sequence of the relay needs to be switched when the next high-voltage power-off process is carried out according to the acquired first load working condition; the second control module is in communication connection with the first judgment module and is used for controlling the second relay to be disconnected and then controlling the first relay to be disconnected to complete the high-voltage power-down operation instruction when the switching-off sequence of the relays is judged to need to be switched and the high-voltage power-down request is obtained again; the second acquisition module is in communication connection with the second control module and is used for acquiring a second loading working condition of the second relay; and the second judgment module is in communication connection with the second acquisition module and is used for judging whether the switching-off sequence of the relay needs to be switched when the next high-voltage power-off according to the acquired second load-carrying working condition.
In a third aspect, the present invention provides a storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements a power-down method for extending the lifetime of a vehicle relay as claimed in any one of claims 1 to 8.
Based on the same inventive concept, the embodiments of the present application further provide a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements all or part of the method steps of the above method.
The present invention can implement all or part of the processes of the above methods, and can also be implemented by using a computer program to instruct related hardware, where the computer program can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the above method embodiments can be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, in accordance with legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunications signals.
Based on the same inventive concept, an embodiment of the present application further provides an electronic device, which includes a memory and a processor, where the memory stores a computer program running on the processor, and the processor executes the computer program to implement all or part of the method steps in the method.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, the processor being the control center of the computer device and the various interfaces and lines connecting the various parts of the overall computer device.
The memory may be used to store computer programs and/or modules, and the processor may implement various functions of the computer device by executing or executing the computer programs and/or modules stored in the memory, as well as by invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (e.g., a sound playing function, an image playing function, etc.); the storage data area may store data (e.g., audio data, video data, etc.) created according to the use of the cellular phone. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, server, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), servers and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A power-off method for prolonging the service life of a finished automobile relay is characterized by comprising the following steps:
acquiring high-voltage power-off request information of a high-voltage loop;
when a high-voltage power-down request is detected, controlling a first relay to be disconnected, then controlling a second relay to be disconnected to complete a high-voltage power-down operation instruction, and simultaneously acquiring a first load working condition of the first relay;
judging whether the switching-off sequence of the relay is required to be switched when the next high-voltage power-off is carried out according to the acquired first load working condition;
when the switching-off sequence of the relays is judged to be required to be switched, and the high-voltage power-down request is obtained again, the second relay is controlled to be switched off, then the first relay is controlled to be switched off to complete the high-voltage power-down operation instruction, and meanwhile, a second load-carrying working condition of the second relay is obtained;
and judging whether the switching-off sequence of the relay is required to be switched when the next high-voltage power-off is carried out according to the acquired second load-carrying working condition.
2. The power-off method for prolonging the service life of the relay of the whole vehicle as claimed in claim 1, wherein the first relay is a main positive relay, and the second relay is a main negative relay.
3. The power-off method for prolonging the service life of the relay of the whole vehicle as claimed in claim 1, wherein the first on-load working condition comprises a first cut-off current and a first on-load cut-off number;
the step of judging whether the switching-off sequence of the relay needs to be switched or not when the next high-voltage power-off is carried out according to the acquired first load working condition comprises the following steps:
obtaining a first equivalent life time of the first relay according to the obtained first load cut-off time and the obtained first cut-off current;
acquiring a first switching equivalent life time threshold;
and when the first equivalent life time and the first switching equivalent life time threshold are detected, judging that the switching-off sequence of the relays needs to be switched.
4. The power-off method for prolonging the service life of the relay of the whole vehicle as claimed in claim 3, wherein the step of obtaining the first equivalent service life times of the first relay according to the obtained first on-load cut-off times and the obtained first cut-off current comprises the following steps:
acquiring a first corresponding mapping table of a first cut-off current, a first equivalent single reduced life time and a first on-load cut-off time of a first relay;
and obtaining the first equivalent life time of the first relay according to the obtained first cut-off current, the first load cut-off time and the first corresponding mapping table.
5. The power-off method for prolonging the service life of the relay of the whole vehicle as claimed in claim 1, wherein the second on-load working condition comprises a second cut-off current and a second on-load cut-off number,
the step of judging whether the switching-off sequence of the relay needs to be switched or not when the next high-voltage power-off is carried out according to the obtained second load working condition comprises the following steps:
obtaining a second equivalent life time of the second relay according to the obtained second on-load cut-off time and the second cut-off current;
acquiring a second switching equivalent life time threshold;
and when the second equivalent life time and the second switching equivalent life time threshold are detected, judging the switching-off sequence of the relay needing to be switched.
6. The power-off method for prolonging the service life of the relay of the whole vehicle as claimed in claim 5, wherein the step of obtaining the second equivalent service life times of the second relay according to the obtained second on-load cut-off times and the second cut-off current comprises the following steps:
acquiring a second corresponding mapping table of a second cut-off current, a second equivalent life time and a second on-load cut-off time of a second relay;
and obtaining the second equivalent life time of the second relay according to the obtained second cut-off current, the second on-load cut-off time and the second corresponding mapping table.
7. The power-off method for prolonging the service life of the relay of the whole vehicle as claimed in claim 1, wherein after the step of judging whether the switching-off sequence of the relay is required to be switched when the next high-voltage power-off is carried out according to the acquired first load working condition, the method further comprises the following steps:
and when the acquired current value of the first load current of the first relay exceeds a preset load cut-off current safety threshold, executing an operation instruction for switching the turn-off sequence of the relay.
8. The power-off method for prolonging the service life of the relay of the whole vehicle as claimed in claim 7, wherein the preset load cut-off current safety threshold is 400A.
9. The utility model provides a lower electric system of extension whole car relay life-span which characterized in that includes:
the detection module is used for acquiring high-voltage power-off request information of the high-voltage loop;
the first control module is in communication connection with the detection module and is used for controlling the first relay to be disconnected and then controlling the second relay to be disconnected to complete a high-voltage power-down operation instruction when a high-voltage power-down request is detected;
the first acquisition module is in communication connection with the first control module and is used for acquiring a first load working condition of the first relay;
the first judgment module is in communication connection with the first acquisition module and is used for judging whether the switching-off sequence of the relay needs to be switched when the next high-voltage power-off process is carried out according to the acquired first load working condition;
the second control module is in communication connection with the first judgment module and is used for controlling the first relay to be disconnected after the second relay is controlled to be disconnected to complete the high-voltage power-down operation instruction when the switching-off sequence of the relays is judged to need to be switched and the high-voltage power-down request is obtained again;
the second acquisition module is in communication connection with the second control module and is used for acquiring a second loading working condition of the second relay; and the number of the first and second groups,
and the second judging module is in communication connection with the second acquiring module and is used for judging whether the switching-off sequence of the relay needs to be switched when the next high-voltage power supply is cut off according to the acquired second load-carrying working condition.
10. A storage medium having a computer program stored thereon, wherein the computer program, when executed by a processor, implements a power-down method for extending the lifetime of a vehicle relay as claimed in any one of claims 1 to 8.
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