CN112305415B - Real-time monitoring method and system for service life of high-voltage contactor - Google Patents
Real-time monitoring method and system for service life of high-voltage contactor Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention relates to the field of high-voltage contactors, in particular to a method and a system for monitoring the service life of a high-voltage contactor in real time. The method for monitoring the service life of the high-voltage contactor in real time is applied to a battery connecting circuit and comprises the following steps: providing a standard resistance value of the high-voltage contactor; and acquiring a first resistance value of the first contactor and a second resistance value of the second contactor in real time, and alarming according to the first resistance value, the second resistance value and the standard resistance value. The technical scheme of the invention has the beneficial effects that: the current service life condition of the high-voltage contactor is accurately detected in real time, the problem that the high-voltage contactor cannot be predicted or early-warned in advance after the service life is ended and is used continuously to cause over-temperature can be avoided, and then the risk caused by the functional failure of a battery or other high-voltage components can be avoided.
Description
Technical Field
The invention relates to the field of high-voltage contactors, in particular to a method and a system for monitoring the service life of a high-voltage contactor in real time.
Background
With the subsequent popularization and development of electric vehicles and plug-in hybrid electric vehicles, high-voltage electricity safety is increasingly important, and a high-voltage contactor is usually arranged in a high-voltage main circuit of the electric vehicle, so that the operation of the electric vehicle is seriously affected by the failure of the high-voltage contactor. Therefore, during operation, real-time diagnosis of the state of the high-voltage contactor is required to confirm whether the contactor state is consistent with the control requirement.
In the prior art, the working state of the high-voltage contactor is usually detected by collecting the temperature, the voltage value, the current value or the capacitive load state within a period of time and comparing the temperature, the voltage value and the current value with the historical experience change, however, the mode needs the historical experience change based on the mode, if errors exist in the historical experience change, the subsequent state detection is misjudged, the working state of the high-voltage contactor cannot be quickly and accurately obtained, the service life end of the high-voltage contactor cannot be predicted or early warned in advance, and the problem that the high-voltage contactor is over-heated in use is caused.
Disclosure of Invention
Aiming at the problems in the prior art, the application provides a real-time monitoring method and a real-time monitoring system for the service life of a high-voltage contactor.
The high-voltage contactor life real-time monitoring method is applied to a battery connecting circuit, wherein the battery connecting circuit comprises a first contactor, a second contactor and a battery pack, the first contactor is connected in series between a positive pole and a positive pole access point of the battery pack, and the second contactor is connected in series between a negative pole and a negative pole access point of the battery pack;
the high-voltage contactor service life real-time monitoring method comprises the following steps:
providing a standard resistance value of the high-voltage contactor;
and acquiring a first resistance value of the first contactor and a second resistance value of the second contactor in real time, and alarming according to the first resistance value, the second resistance value and the standard resistance value.
Preferably, the method for acquiring the first resistance value and the second resistance value in real time includes:
step S1, collecting voltages at two ends of the first contactor, voltages at two ends of the second contactor and current in the battery connection circuit in real time;
and S2, acquiring the first resistance value according to the voltage and the current at two ends of the first contactor, and acquiring the second resistance value according to the voltage and the current at two ends of the second contactor.
Preferably, the following formula is adopted in the step S2:
wherein,
r11 is used to represent the first resistance value;
U b and U a For representing the voltages across the first contactor, respectively;
r21 is used to represent the second resistance value;
U d and U c For representing the voltages across the second contactor, respectively.
Preferably, the method for alarming according to the first resistance value, the second resistance value and the standard resistance value comprises the following steps:
step S3, judging whether at least one of the first resistance value and the second resistance value is larger than the standard resistance value:
if yes, a first type of alarm is carried out;
if not, turning to step S4;
and S4, acquiring the service life residual value of the high-voltage contactor according to the first resistance value, the second resistance value and the standard resistance value, and carrying out second-class alarm.
Preferably, the step S4 includes the following steps:
step S41, obtaining a first initial resistance value of the first contactor and a second initial resistance value of the second contactor;
step S42, obtaining a first life residual value of the first contactor according to the first initial resistance value, the first resistance value and the standard resistance value, and obtaining a second life residual value of the second contactor according to the second initial resistance value, the second resistance value and the standard resistance value;
step S43, determining whether at least one of the first lifetime residual value and the second lifetime residual value is smaller than a preset lifetime threshold:
if yes, a second type of alarm is carried out, and then the process is exited;
if not, the process is exited.
Preferably, the following formula is adopted in the step S42:
wherein,
l1 is used to represent the first life residue;
r0 is used to represent the standard resistance value;
r11 is used to represent the first resistance value;
r10 is used to represent the first initial resistance value;
l2 is used to represent the second life residue;
r0 is used to represent the standard resistance value;
r21 is used to represent the second resistance value;
r20 is used to represent the second initial resistance value.
Preferably, the step S3 displays, on at least one display device provided on the vehicle, display contents corresponding to the first type of alarm to the user; and/or
The step S4 is to display the display content corresponding to the second type alarm to the user on at least one display device arranged on the vehicle; and/or
The step S3 is to display sound content corresponding to the first type of alarm to the user on at least one sound playing device arranged on the vehicle; and/or
And step S4, displaying sound content corresponding to the second type of alarm to the user on at least one sound playing device arranged on the vehicle.
The high-voltage contactor life real-time monitoring system is applied to a battery connecting circuit, wherein the battery connecting circuit comprises a first contactor, a second contactor and a battery pack, the first contactor is connected in series between a positive pole and a positive pole access point of the battery pack, and the second contactor is connected in series between a negative pole and a negative pole access point of the battery pack;
the high-voltage contactor life real-time monitoring system comprises:
the first acquisition module is used for acquiring a standard resistance value of the high-voltage contactor;
the second acquisition module acquires a first resistance value of the first contactor and a second resistance value of the second contactor in real time;
and the control module is connected with the first acquisition module and the second acquisition module and is used for alarming according to the first resistance value, the second resistance value and the standard resistance value.
Preferably, the second obtaining module includes:
the first acquisition unit is used for acquiring the voltages at two ends of the first contactor, the voltages at two ends of the second contactor and the current in the battery connection circuit in real time;
and the resistance value processing unit is connected with the first acquisition unit and is used for acquiring the first resistance value according to the voltage at two ends of the first contactor and the current and acquiring the second resistance value according to the voltage at two ends of the second contactor and the current.
Preferably, the resistance value processing unit obtains the first resistance value and the second resistance value by adopting the following formula:
wherein,
r11 is used to represent the first resistance value;
U b and U a For representing the voltages across the first contactor, respectively;
r21 is used to represent the second resistance value;
U d and U c For representing the voltages across the second contactor, respectively.
Preferably, the control module includes:
the first judging unit is used for judging whether at least one of the first resistance value and the second resistance value is larger than the standard resistance value and outputting a first judging result;
the first processing unit is connected with the first judging unit and is used for generating and outputting a first type alarm signal when at least one of the first resistance value and the second resistance value is larger than the standard resistance value as the first judging result;
and the second processing unit is connected with the first judging unit and is used for acquiring the service life residual value of the high-voltage contactor according to the first resistance value, the second resistance value and the standard resistance value when the first judging result is that the first resistance value and the second resistance value are not larger than the standard resistance value, and generating and outputting a second type alarm signal according to the service life residual value.
Preferably, the second processing unit includes:
a first acquisition unit configured to acquire a first initial resistance value of the first contactor and a second initial resistance value of the second contactor;
a first processing unit, connected to the first obtaining unit, for obtaining a first life residual value of the first contactor according to the first initial resistance value, the first resistance value and the standard resistance value, and obtaining a second life residual value of the second contactor according to the second initial resistance value, the second resistance value and the standard resistance value;
the first judging component is connected with the first processing component and is used for judging whether at least one of the first life residual value and the second life residual value is smaller than a preset life threshold value and outputting a second judging result;
and the second processing component is connected with the first judging component and is used for generating and outputting a second type alarm signal when at least one of the first life residual value and the second life residual value is smaller than a preset life threshold value as the second judging result.
Preferably, the first processing unit obtains the first life residue and the second life residue using the following formula:
wherein,
l1 is used to represent the first life residue;
r0 is used to represent the standard resistance value;
r11 is used to represent the first resistance value;
r10 is used to represent the first initial resistance value;
l2 is used to represent the second life residue;
r0 is used to represent the standard resistance value;
r21 is used to represent the second resistance value;
r20 is used to represent the second initial resistance value.
Preferably, the control module includes:
a first display execution unit, configured to display content corresponding to the first type of alarm signal to the user on at least one display device set on the vehicle according to the first type of alarm signal; and/or
A second display execution unit for displaying display contents corresponding to the second type alarm signal to the user on at least one display device provided on the vehicle according to the second type alarm signal; and/or
A first sound executing unit, configured to play sound content corresponding to the first instruction to the user on at least one sound playing device set on the vehicle according to the first type alarm signal; and/or
And the second sound execution unit is used for playing sound content corresponding to the second type alarm signal to the user on at least one sound playing device arranged on the vehicle according to the second type alarm signal.
The technical scheme has the following advantages or beneficial effects: the application provides a high-voltage contactor life real-time monitoring method and system, which are used for judging the size relation between the current resistance value and the standard value and the size relation between the current life residual value and the corresponding residual value threshold value through the voltage drop obtained in real time so as to accurately detect the current life condition of the high-voltage contactor in real time, and can avoid the problem that the high-voltage contactor cannot be predicted or early-warned in advance after the life is ended so as to continue to be used, thereby avoiding the risk brought by the functional failure of a battery or other high-voltage components caused by the problem.
Drawings
FIG. 1 is a flow chart of a method for real-time monitoring of life of a high voltage contactor according to a preferred embodiment of the present application;
FIG. 2 is a schematic diagram of a battery connection circuit according to the preferred embodiment of the present application;
FIG. 3 is a flow chart of step S3 in a method for real-time monitoring life of a high voltage contactor according to a preferred embodiment of the present application;
FIG. 4 is a flow chart of step S4 in a method for monitoring life of a high voltage contactor in real time according to a preferred embodiment of the present application;
FIG. 5 is a schematic diagram of a real-time monitoring system for life of a high-voltage contactor according to the preferred embodiment of the present application;
FIG. 6 is a schematic structural diagram of a second acquisition module according to a preferred embodiment of the present application;
FIG. 7 is a schematic structural diagram of a control module according to the preferred embodiment of the present application;
FIG. 8 is a schematic diagram of a second processing unit according to the preferred embodiment of the present application;
fig. 9 is a schematic structural diagram of a control module according to a preferred embodiment of the present application.
Detailed Description
The present application will now be described in detail with reference to the accompanying drawings and specific examples. The present application is not limited to this embodiment, and other embodiments may fall within the scope of the present application as long as they conform to the gist of the present application.
The utility model provides a problem of easy emergence erroneous judgement among the solution prior art carries out the in-process that high-voltage contactor detected based on historical experience variation, through the pressure drop that acquires in real time to the size relation between current resistance value and the standard value, can accurately detect high-voltage contactor's current life-span condition. The following specific technical means are provided as examples for realizing the gist of the present application, and it is understood that the following embodiments, and technical features in the embodiments, may be combined with each other without conflict. And the scope of protection of the present application should not be limited by the examples used to illustrate the feasibility of the present application.
In a preferred embodiment of the present application, based on the above-mentioned problems existing in the prior art, a method and a system for real-time monitoring of life of a high voltage contactor are now provided.
The method is applied to a battery connection circuit, as shown in fig. 2, wherein the battery connection circuit comprises a first contactor C1, a second contactor C2 and a battery pack B, the first contactor C1 is connected in series between the positive pole of the battery pack B and a positive pole access point bat+, and the second contactor C2 is connected in series between the negative pole of the battery pack B and a negative pole access point Bat-;
the high-voltage contactor service life real-time monitoring method comprises the following steps:
providing a standard resistance value of the high-voltage contactor;
and acquiring a first resistance value of the first contactor C1 and a second resistance value of the second contactor C2 in real time, and alarming according to the first resistance value, the second resistance value and the standard resistance value.
Specifically, in the prior art, the service life of the contactor is monitored indirectly through temperature monitoring or through historical variation of contact resistance, so that the service condition of the contactor cannot be accurately obtained in real time, and the service life of the contactor cannot be timely alarmed. Therefore, the application provides a high-voltage contactor service life real-time monitoring method which is applied to a battery connection circuit and alarms by acquiring the first resistance value of a first contactor C1, the second resistance value of a second contactor C2 and the magnitude relation among standard resistance values in real time.
In a preferred embodiment of the present invention, as shown in fig. 1, a method for acquiring a first resistance value and a second resistance value in real time includes:
step S1, collecting voltages at two ends of a first contactor, voltages at two ends of a second contactor and current in a battery connection circuit in real time;
and S2, acquiring a first resistance value according to the voltage and the current at two ends of the first contactor, and acquiring a second resistance value according to the voltage and the current at two ends of the second contactor.
Specifically, the first contactor may be connected in series between the positive electrode of the battery pack and a positive electrode access point, and correspondingly, the first contactor may be a positive electrode contactor, and the second contactor may be connected in series between the negative electrode of the battery pack and a negative electrode access point, and correspondingly, the second contactor may be a negative electrode contactor.
In the process of acquiring the first resistance value of the first contactor, the current I in the circuit can be acquired firstly, and the voltage U at two ends of the first contactor can be acquired by a high-voltage acquisition mode b And U a The first resistance value may then be obtained using the following equation:
in the process of acquiring the second resistance value of the second contactor, the current I in the circuit can be acquired firstly, and the voltage U at two ends of the second contactor can be acquired by a high-voltage acquisition mode d And U c The second resistance value may then be obtained using the following equation:
further, the steps S1-S2 are applicable to the charging and discharging states of the battery pack, and U is in the voltage at two ends of the first contactor when the battery pack is in the charging state b ＞U a The first resistance value in the charged state can thus be obtained by the following formula:
while in a discharge state, a firstU in voltage at two ends of contactor b ＜U a The first resistance value in the discharge state can thus be obtained by the following formula:
correspondingly, the second resistance value of the second contactor is also according to the above, and U is in the voltage at the two ends of the second contactor when the second contactor is in the charging state d ＞U c The second resistance value in the charged state can thus be obtained by the following formula:
while in the discharging state, U is in the voltage at two ends of the second contactor d ＜U c The second resistance value in the discharge state can thus be obtained by the following formula:
in a preferred embodiment of the present invention, as shown in fig. 3, the method for alarming according to the first resistance value, the second resistance value and the standard resistance value includes:
step S3, judging whether at least one of the first resistance value and the second resistance value is larger than a standard resistance value:
if yes, a first type of alarm is carried out;
if not, turning to step S4;
and S4, acquiring the service life residual value of the high-voltage contactor according to the first resistance value, the second resistance value and the standard resistance value, and carrying out second-class alarm.
Specifically, after the first resistance value and the second resistance value are obtained, it is necessary to determine the magnitude relation between the first resistance value and the second resistance value and the standard resistance value, respectively, if at least one of the first resistance value and the second resistance value is greater than the standard resistance value, that is, the first resistance value is greater than the standard resistance value, or the second resistance value is greater than the standard resistance value, or both the first resistance value and the second resistance value are greater than the standard resistance value, the first type alarm can be performed, and conversely, if both the first resistance value and the second resistance value are not greater than the standard resistance value, the life residual value of the high-voltage contactor is obtained according to the first resistance value, the second resistance value and the standard resistance value, and the second type alarm is performed.
Further, the first type of alarm refers to life end alarm, and the second type of alarm refers to life residual value early warning, so that the problem of over-temperature caused by the fact that the life of the high-voltage contactor cannot be predicted or early warned in advance and the high-voltage contactor is used continuously after the life is ended can be solved, and risks caused by the failure of functions of a battery or other high-voltage components can be avoided.
In a preferred embodiment of the present invention, as shown in fig. 4, step S4 includes the following steps:
step S41, obtaining a first initial resistance value of a first contactor and a second initial resistance value of a second contactor;
step S42, a first life residual value of the first contactor is obtained according to the first initial resistance value, the first resistance value and the standard resistance value, and a second life residual value of the second contactor is obtained according to the second initial resistance value, the second resistance value and the standard resistance value;
step S43, judging whether at least one of the first life residual value and the second life residual value is smaller than a preset life threshold value:
if yes, a second type of alarm is carried out, and then the process is exited;
if not, the process is exited.
In the process of acquiring the service life residual value of the high-voltage contactor according to the first resistance value, the second resistance value and the standard resistance value and giving a second type alarm, firstly, the initial resistance value of the first contactor can be acquired in advance according to the voltage at two ends of the first contactor and the current value in the circuit in an initial state, and correspondingly, the initial resistance value of the second contactor can also be acquired in advance according to the voltage at two ends of the second contactor and the current value in the circuit in the initial state; and then, acquiring a first life residual value, and acquiring a second life residual value of the second contactor according to the second initial resistance value, the second resistance value and the standard resistance value, wherein if at least one of the first life residual value and the second life residual value is smaller than a preset life threshold, that is, the first life residual value is smaller than the life threshold, or the second life residual value is smaller than the life threshold, or both the first life residual value and the second life residual value are smaller than the life threshold, a second type alarm can be performed.
In the process of obtaining the first life residual value, the first life residual value L1 of the first contactor may be obtained according to a first initial resistance value R10 obtained in advance, a first resistance value R11 and a standard resistance value R0 obtained in real time, and the following formula:
accordingly, in the process of obtaining the second life residual value, the second life residual value L2 of the second contactor may be obtained according to the second initial resistance value R20 obtained in advance, the second resistance value R21 and the standard resistance value R0 obtained in real time, and the following formula:
in a preferred embodiment of the present invention, step S3 displays display contents corresponding to the first type of alarm to the user on the at least one display device provided, and step S4 displays display contents corresponding to the second type of alarm to the user on the at least one display device provided. Specifically, for the battery connection circuit of the electric vehicle, display contents can be pre-stored in the vehicle, the display contents can be characters and/or pictures and/or images corresponding to the first type of alarm and the second type of alarm, the display device in the vehicle can be a central control screen, a secondary screen and an instrument panel, and when the display device displays the contents, the characters and/or pictures and/or images of the corresponding alarm types can be acquired and displayed on the display device.
In a preferred embodiment of the present invention, step S3 displays, on the at least one sound playing device provided, sound content corresponding to the first type of alarm to the user, and step S4 displays, on the at least one sound playing device provided, sound content corresponding to the second type of alarm to the user. Specifically, for the battery connection circuit of the electric vehicle, the sound content may be the effect sound and/or voice corresponding To the first type alarm and the second type alarm, when the sound content is played on the sound playing device, the effect sound and/or voice corresponding To the alarm type may be obtained and played on the sound playing device, a Text corresponding To the first indication may be stored in advance, and a voice synthesis engine, such as a TTS (Text To Speech) engine, may be provided, when the sound playing device plays the first type alarm or the second type alarm, the corresponding Text may be obtained first, and then the voice synthesis engine forms voice, and the formed operation is played.
In the preferred embodiment of the invention, the corresponding alarm content can be displayed and played on the mobile terminal of the user.
In a preferred embodiment of the present invention, for a battery connection circuit of an electric vehicle, when an operation resource set in the vehicle is in an occupied state, the collected voltage at two ends of the first contactor and the collected voltage and current at two ends of the second contactor are sent to a cloud end remotely connected with the vehicle, a first resistance value of the first contactor and a second resistance value of the second contactor are obtained through cloud end calculation, and according to the magnitude relation between the first resistance, the second resistance and a standard resistance value, an alarm signal is generated according to a judgment result and fed back to the vehicle end.
The high-voltage contactor life real-time monitoring system is applied to a battery connecting circuit, wherein the battery connecting circuit comprises a first contactor, a second contactor and a battery pack, the first contactor is connected in series between a positive pole and a positive pole access point of the battery pack, and the second contactor is connected in series between a negative pole and a negative pole access point of the battery pack;
as shown in fig. 5, the high-voltage contactor life real-time monitoring system includes:
the first acquisition module 1 is used for acquiring a standard resistance value of the high-voltage contactor;
the second acquisition module 2 acquires a first resistance value and a second resistance value of the high-voltage contactor in real time;
the control module 3 is connected with the first acquisition module 1 and the second acquisition module 2 and is used for alarming according to the first resistance value, the second resistance value and the standard resistance value.
According to the technical scheme, the current condition of the high-voltage contactor is detected according to the magnitude relation between the current resistance value and the standard value of the voltage drop obtained in real time, and the specific detection process is described above, so that the description is omitted. Further, through accurately detecting the current service life condition of the high-voltage contactor in real time, the problem that the high-voltage contactor cannot be predicted or early-warned in advance after the service life is ended and is used continuously to cause over-temperature can be avoided, and further risks caused by functional failure of a battery or other high-voltage components caused by the over-temperature problem can be avoided.
In a preferred embodiment of the present invention, as shown in fig. 6, the second acquisition module 2 includes:
a first acquisition unit 21 for acquiring voltages at both ends of the first contactor, voltages at both ends of the second contactor, and currents in the battery connection circuit in real time;
the resistance value processing unit 22 is connected to the first obtaining unit 21, and is configured to obtain a first resistance value according to the voltage and the current at the two ends of the first contactor, and obtain a second resistance value according to the voltage and the current at the two ends of the second contactor.
Specifically, in the process of acquiring the first resistance value of the first contactor, the first acquisition unit 21 may acquire the current I in the circuit, and the voltage U across the first contactor b And U a The resistance value processing unit 22 may then obtain the first resistance value using the following formula:
wherein, at the time of obtaining the second contactorIn the process of two resistance values, the first acquisition unit 21 can acquire the current I in the circuit and acquire the voltage U at two ends of the second contactor d And U c The resistance value processing unit 22 may then obtain the second resistance value using the following formula:
in a preferred embodiment of the present invention, as shown in fig. 7, the control module 3 includes:
a first judging unit 31 for judging whether at least one of the first resistance value and the second resistance value is greater than the standard resistance value and outputting a first judgment result;
the first processing unit 32 is connected to the first judging unit 31, and is configured to generate and output a first type alarm signal when at least one of the first resistance value and the second resistance value is greater than the standard resistance value as a first judging result;
the second processing unit 33 is connected to the first judging unit 31, and is configured to obtain a life residual value of the high-voltage contactor according to the first resistance value, the second resistance value and the standard resistance value when the first judging result is that neither the first resistance value nor the second resistance value is greater than the standard resistance value, and generate and output a second type alarm signal according to the life residual value.
Specifically, after the first resistance value and the second resistance value are obtained, the first judging unit 31 is required to judge the magnitude relation between the first resistance value and the second resistance value and the standard resistance value, respectively, if at least one of the first resistance value and the second resistance value is greater than the standard resistance value, that is, the first resistance value is greater than the standard resistance value, or the second resistance value is greater than the standard resistance value, or both the first resistance value and the second resistance value are greater than the standard resistance value, the first processing unit 32 may perform the first type alarm, and conversely, if neither the first resistance value nor the second resistance value is greater than the standard resistance value, the second processing unit 33 may obtain the life residual value of the high voltage contactor according to the first resistance value, the second resistance value and the standard resistance value and perform the second type alarm.
In a preferred embodiment of the present invention, as shown in fig. 8, the second processing unit 33 includes:
a first obtaining part 331 for obtaining a first initial resistance value of the first contactor and a second initial resistance value of the second contactor;
a first processing unit 332 connected to the first obtaining unit 331, for obtaining a first life residual value of the first contactor according to the first initial resistance value, the first resistance value and the standard resistance value, and obtaining a second life residual value of the second contactor according to the second initial resistance value, the second resistance value and the standard resistance value;
a first judging unit 333, connected to the first processing unit 332, for judging whether at least one of the first lifetime residual value and the second lifetime residual value is smaller than a preset lifetime threshold value and outputting a second judging result;
the second processing unit 334 is connected to the first judging unit 333, and is configured to generate and output a second type alarm signal when at least one of the first lifetime residual value and the second lifetime residual value is smaller than a preset lifetime threshold value as a second judging result.
Specifically, the first obtaining unit 331 may obtain an initial resistance value of the first contactor according to a voltage across the first contactor and a current value in the circuit in an initial state, and obtain an initial resistance value of the second contactor according to a voltage across the second contactor and a current value in the circuit in an initial state in advance; the first processing unit 332 obtains a second lifetime residual value of the second contactor according to the second initial resistance value, the second resistance value and the standard resistance value, and the first judging unit 333 judges that at least one of the first lifetime residual value and the second lifetime residual value is smaller than a preset lifetime threshold, that is, when the first judging unit 333 judges that the first lifetime residual value is smaller than the lifetime threshold, or the second lifetime residual value is smaller than the lifetime threshold, or both the first lifetime residual value and the second lifetime residual value are smaller than the lifetime threshold, the second processing unit 334 performs the second type alarm.
In the process of the first processing unit 332 acquiring the first life residual value, the first life residual value L1 of the first contactor may be acquired according to the first initial resistance value R10 acquired in advance by the first acquiring unit 331, the first resistance value R11 and the standard resistance value R0 acquired in real time, and the following formula:
accordingly, in the process of the first processing unit 332 acquiring the second life residual value, the second life residual value L2 of the second contactor may be acquired according to the second initial resistance value R20 acquired in advance by the first acquiring unit 331, the second resistance value R21 and the standard resistance value R0 acquired in real time, and the following formula:
in a preferred embodiment of the present invention, the control module 3 may include a first display execution unit 34 for displaying display contents corresponding to the first type of alarm signal to the user on at least one display device provided according to the first type of alarm signal.
In a preferred embodiment of the present invention, the control module 3 may include a second display execution unit 35 for displaying display contents corresponding to the second type alarm signal to the user on the at least one display device provided according to the second type alarm signal.
In a preferred embodiment of the present invention, the control module 3 may include a first sound executing unit 36 for playing sound contents corresponding to the first indication to the user on the at least one sound playing device provided according to the first type of alarm signal.
In a preferred embodiment of the present invention, the control module 3 may include a second sound executing unit 37 for playing sound contents corresponding to the second type alarm signal to the user on the at least one sound playing device provided according to the second type alarm signal.
Specifically, using the battery connection circuit on the electric vehicle, the control module 3 may include a first display execution unit 34 that may display contents corresponding to the first type of alarm to the user on at least one display device provided on the vehicle according to the first type of alarm signal, and the control module 3 may further include a second display execution unit 35 that may display contents corresponding to the second type of alarm to the user on at least one display device provided on the vehicle according to the second type of alarm signal. Specifically, the control module 3 is configured to display contents corresponding to the first type of alarm and the second type of alarm on at least one display device set on the vehicle according to the first type of alarm signal and the second type of alarm signal, further, the display contents may be text and/or pictures and/or images corresponding to the first indication, the display device may be a dashboard facing the main driving seat besides a display screen facing the auxiliary driving seat, and may also be a central control screen between the main driving seat and the auxiliary driving seat, and accordingly, the control module 3 further includes a display storage unit for storing the display contents, where the display storage unit may pre-store the text and/or pictures and/or images, and the display execution unit reads the text and/or pictures and/or images in the display storage unit and displays the text and/or pictures and/or images on the display device.
As an alternative embodiment, using a battery connection circuit on an electric vehicle, the control module 3 may include a first sound executing unit 36 for displaying display contents corresponding to the first type of alarm to a user on at least one sound playing device provided on the vehicle according to the first type of alarm signal, and the control module 3 may further include a second sound executing unit 37 for displaying display contents corresponding to the second type of alarm to a user on at least one sound playing device provided on the vehicle according to the second type of alarm signal. Further, the sound content may be an effect sound and/or a voice, and accordingly, the control module 3 may include a sound storage unit for storing the sound content, the sound storage unit may store the effect sound and/or the voice in advance, the sound execution unit reads the effect sound and/or the voice in the sound storage unit and plays the effect sound and/or the voice on the sound playing device, and preferably, the control module 34 may further include a Text storage unit and provides a voice synthesis engine, such as a TTS (Text To Speech) engine, and the sound execution unit reads the Text in the Text storage unit, forms the voice by the voice synthesis engine and plays the voice on the sound playing device.
Examples
This embodiment is one specific application example of detecting a specific embodiment of the high-voltage contactor.
In this embodiment, the life of the high-voltage contactor may be detected according to the resistance values of the first contactor connected in series between the positive electrode and a positive electrode access point of the battery pack and the second contactor connected in series between the negative electrode and a negative electrode access point of the battery pack in the battery connection circuit.
Firstly, the voltage at two ends of the first contactor, the voltage at two ends of the second contactor and the current in the battery connection circuit can be collected in real time, then the first resistance value is obtained according to the voltage and the current at two ends of the first contactor, and the second resistance value is obtained according to the voltage and the current at two ends of the second contactor.
Then, judging whether at least one of the first resistance value and the second resistance value is larger than the standard resistance value, that is, the first resistance value is larger than the standard resistance value, or the second resistance value is larger than the standard resistance value, or when the first resistance value and the second resistance value are both larger than the standard resistance value, a first type alarm can be performed, conversely, if the first resistance value and the second resistance value are not larger than the standard resistance value, firstly, the initial resistance value of the first contactor can be obtained in advance according to the voltage at both ends of the first contactor and the current value in the circuit in the initial state, and the initial resistance value of the second contactor can be obtained according to the voltage at both ends of the second contactor and the current value in the circuit in the initial state; and then obtaining a second life residual value of the second contactor according to the second initial resistance value, the second resistance value and the standard resistance value, and performing a second type alarm if the first life residual value is smaller than the life threshold value, or the second life residual value is smaller than the life threshold value, or both the first life residual value and the second life residual value are smaller than the life threshold value.
The foregoing is merely illustrative of the preferred embodiments of the present invention and is not intended to limit the embodiments and scope of the present invention, and it should be appreciated by those skilled in the art that equivalent substitutions and obvious variations may be made using the description and illustrations herein, which should be included in the scope of the present invention.
Claims (10)
1. The high-voltage contactor life real-time monitoring method is applied to a battery connecting circuit and is characterized in that the battery connecting circuit comprises a first contactor, a second contactor and a battery pack, wherein the first contactor is connected in series between a positive pole and a positive pole access point of the battery pack, and the second contactor is connected in series between a negative pole and a negative pole access point of the battery pack;
the high-voltage contactor service life real-time monitoring method comprises the following steps:
providing a standard resistance value of the high-voltage contactor;
acquiring a first resistance value of the first contactor and a second resistance value of the second contactor in real time, and alarming according to the first resistance value, the second resistance value and the standard resistance value;
the method for alarming according to the first resistance value, the second resistance value and the standard resistance value comprises the following steps:
step S3, judging whether at least one of the first resistance value and the second resistance value is larger than the standard resistance value:
if yes, a first type of alarm is carried out;
if not, turning to step S4;
s4, acquiring a life residual value of the high-voltage contactor according to the first resistance value, the second resistance value and the standard resistance value and carrying out second-class alarm;
the life residual value of the high-voltage contactor adopts the following formula:
wherein,
l1 is used to represent a first life residue of the first contactor;
r0 is used to represent the standard resistance value;
r11 is used to represent the first resistance value;
r10 is used to represent a first initial resistance value of the first contactor;
l2 is used to represent a second life residue of the second contactor;
r0 is used to represent the standard resistance value;
r21 is used to represent the second resistance value;
r20 is used to represent a second initial resistance value of the second contactor.
2. The method of claim 1, wherein the method of acquiring the first resistance value and the second resistance value in real time comprises:
step S1, collecting voltages at two ends of the first contactor, voltages at two ends of the second contactor and current in the battery connection circuit in real time;
and S2, acquiring the first resistance value according to the voltage and the current at two ends of the first contactor, and acquiring the second resistance value according to the voltage and the current at two ends of the second contactor.
3. The method for real-time monitoring of life of high voltage contactor according to claim 2, wherein said step S2 uses the following formula:
wherein,
r11 is used to represent the first resistance value;
U b and U a For representing the voltages across the first contactor, respectively;
r21 is used to represent the second resistance value;
U d and U c For representing the voltages across the second contactor, respectively.
4. The method for real-time monitoring of life of high voltage contactor according to claim 1, wherein said step S4 comprises the following steps:
step S41, obtaining a first initial resistance value of the first contactor and a second initial resistance value of the second contactor;
step S42, obtaining a first life residual value of the first contactor according to the first initial resistance value, the first resistance value and the standard resistance value, and obtaining a second life residual value of the second contactor according to the second initial resistance value, the second resistance value and the standard resistance value;
step S43, determining whether at least one of the first lifetime residual value and the second lifetime residual value is smaller than a preset lifetime threshold:
if yes, a second type of alarm is carried out, and then the process is exited;
if not, the process is exited.
5. The method according to claim 1, wherein the step S3 is to display the display content corresponding to the first type of alarm to the user on at least one display device provided on the vehicle; and/or
The step S4 is to display the display content corresponding to the second type alarm to the user on at least one display device arranged on the vehicle; and/or
The step S3 is to display sound content corresponding to the first type of alarm to the user on at least one sound playing device arranged on the vehicle; and/or
And step S4, displaying sound content corresponding to the second type of alarm to the user on at least one sound playing device arranged on the vehicle.
6. The high-voltage contactor life real-time monitoring system is applied to a battery connecting circuit and is characterized by comprising a first contactor, a second contactor and a battery pack, wherein the first contactor is connected in series between a positive pole and a positive pole access point of the battery pack, and the second contactor is connected in series between a negative pole and a negative pole access point of the battery pack;
the high-voltage contactor life real-time monitoring system comprises:
the first acquisition module is used for acquiring a standard resistance value of the high-voltage contactor;
the second acquisition module acquires a first resistance value of the first contactor and a second resistance value of the second contactor in real time;
the control module is connected with the first acquisition module and the second acquisition module and used for alarming according to the first resistance value, the second resistance value and the standard resistance value;
the control module includes:
the first judging unit is used for judging whether at least one of the first resistance value and the second resistance value is larger than the standard resistance value and outputting a first judging result;
the first processing unit is connected with the first judging unit and is used for generating and outputting a first type alarm signal when at least one of the first resistance value and the second resistance value is larger than the standard resistance value as the first judging result;
the second processing unit is connected with the first judging unit and is used for acquiring a service life residual value of the high-voltage contactor according to the first resistance value, the second resistance value and the standard resistance value when the first judging result is that the first resistance value and the second resistance value are not larger than the standard resistance value, and generating a second type alarm signal according to the service life residual value and outputting the second type alarm signal;
the life residual value of the high-voltage contactor adopts the following formula:
wherein,
l1 is used to represent a first life residue of the first contactor;
r0 is used to represent the standard resistance value;
r11 is used to represent the first resistance value;
r10 is used to represent a first initial resistance value of the first contactor;
l2 is used to represent a second life residue of the second contactor;
r0 is used to represent the standard resistance value;
r21 is used to represent the second resistance value;
r20 is used to represent a second initial resistance value of the second contactor.
7. The real-time monitoring system of high voltage contactor life according to claim 6, wherein said second acquisition module comprises:
the first acquisition unit is used for acquiring the voltages at two ends of the first contactor, the voltages at two ends of the second contactor and the current in the battery connection circuit in real time;
and the resistance value processing unit is connected with the first acquisition unit and is used for acquiring the first resistance value according to the voltage at two ends of the first contactor and the current and acquiring the second resistance value according to the voltage at two ends of the second contactor and the current.
8. The real-time monitoring system of high voltage contactor life according to claim 7, wherein said resistance value processing unit obtains said first resistance value and said second resistance value using the following formula:
wherein,
r11 is used to represent the first resistance value;
U b and U a For representing the voltages across the first contactor, respectively;
r21 is used to represent the second resistance value;
U d and U c For representing the voltages across the second contactor, respectively.
9. The real-time monitoring system of high voltage contactor life according to claim 6, wherein said second processing unit comprises:
a first acquisition unit configured to acquire a first initial resistance value of the first contactor and a second initial resistance value of the second contactor;
a first processing unit, connected to the first obtaining unit, for obtaining a first life residual value of the first contactor according to the first initial resistance value, the first resistance value and the standard resistance value, and obtaining a second life residual value of the second contactor according to the second initial resistance value, the second resistance value and the standard resistance value;
the first judging component is connected with the first processing component and is used for judging whether at least one of the first life residual value and the second life residual value is smaller than a preset life threshold value and outputting a second judging result;
and the second processing component is connected with the first judging component and is used for generating and outputting a second type alarm signal when at least one of the first life residual value and the second life residual value is smaller than a preset life threshold value as the second judging result.
10. The real-time monitoring system of high voltage contactor life according to claim 6, wherein said control module comprises:
the first display execution unit is used for displaying display contents corresponding to the first type of alarm signals to a user on at least one display device arranged on the vehicle according to the first type of alarm signals; and/or
A second display execution unit for displaying display contents corresponding to the second type alarm signal to the user on at least one display device provided on the vehicle according to the second type alarm signal; and/or
A first sound executing unit, configured to play sound content corresponding to the first type alarm signal to the user on at least one sound playing device set on the vehicle according to the first type alarm signal; and/or
And the second sound execution unit is used for playing sound content corresponding to the second type alarm signal to the user on at least one sound playing device arranged on the vehicle according to the second type alarm signal.
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