CN112305415A - Method and system for monitoring service life of high-voltage contactor in real time - Google Patents
Method and system for monitoring service life of high-voltage contactor in real time Download PDFInfo
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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 a 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 of over-temperature caused by continuous use due to the fact that the high-voltage contactor cannot be predicted or early-warned in advance after the service life of the high-voltage contactor is ended can be avoided, and further the risk caused by the function failure of the 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 continuous popularization and development of electric vehicles and plug-in hybrid electric vehicles, the safety of high-voltage electricity utilization becomes more and more important, and a high-voltage contactor is usually arranged in a high-voltage main loop of the electric vehicle, so that the failure of the high-voltage contactor can have very serious influence on the operation of the electric vehicle. Therefore, during the operation, the state of the high-voltage contactor needs to be diagnosed in real time to confirm whether the state of the contactor is consistent with the control requirement.
In the prior art, the working state of the high-voltage contactor is detected by acquiring the temperature, the voltage value, the current value or the capacitive load state within a period of time and comparing the acquired temperature, the voltage value, the current value or the capacitive load state with historical experience variation, however, the historical experience variation needs to be based on the method, if errors exist in the historical experience variation, the subsequent state detection is misjudged correspondingly, the working state of the high-voltage contactor cannot be acquired quickly and accurately, the end of service life of the high-voltage contactor cannot be predicted or early warned in advance, and the high-voltage contactor is over-warm in use.
Disclosure of Invention
The application provides a method and a system for monitoring the service life of a high-voltage contactor in real time, aiming at the problems in the prior art.
A real-time monitoring method for the service life of a high-voltage contactor 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 the anode of the battery pack and an anode access point, and the second contactor is connected in series between the cathode of the battery pack and a cathode access point;
the method for monitoring the service life of the high-voltage contactor in real time 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 the voltage at two ends of the first contactor, the voltage at two ends of the second contactor and the current in the battery connecting circuit in real time;
step S2, obtaining the first resistance value according to the voltage across the first contactor and the current, and obtaining the second resistance value according to the voltage across the second contactor and the current.
Preferably, the step S2 adopts the following formula:
wherein the content of the first and second substances,
r11 is used to represent the first resistance value;
Uband UaThe voltage of the two ends of the first contactor is respectively represented;
r21 is used to represent the second resistance value;
Udand UcFor respectively representing the voltages across the second contactor.
Preferably, the method for alarming according to the first resistance value, the second resistance value and the standard resistance value comprises:
step S3, determining whether at least one of the first resistance value and the second resistance value is greater than the standard resistance value:
if yes, performing first-class alarm;
if not, go to step S4;
and step S4, acquiring 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 performing a second type of alarm.
Preferably, the step S4 includes the following steps:
step S41, acquiring a first initial resistance value of the first contactor and a second initial resistance value of the second contactor;
step S42, obtaining a first residual life 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 residual life 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 life residual value and the second life residual value is less than a preset life threshold:
if yes, performing second-class alarm, and then exiting the process;
if not, exiting the process.
Preferably, the step S42 adopts the following formula:
wherein the content of the first and second substances,
l1 is used to represent the first life residual;
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 residual;
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, in step S3, the display content corresponding to the first type alarm is displayed to the user on at least one display device provided in the vehicle; and/or
The step S4, displaying 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, displaying the sound content corresponding to the first type alarm to the user on at least one sound playing device installed in the vehicle; and/or
In step S4, the sound content corresponding to the second type of alarm is displayed to the user on at least one sound playing device installed in the vehicle.
A real-time monitoring system for the service life of a high-voltage contactor 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 the anode of the battery pack and an anode access point, and the second contactor is connected in series between the cathode of the battery pack and a cathode access point;
high voltage contactor life real-time monitoring system includes:
the first acquisition module is used for acquiring a standard resistance value of the high-voltage contactor;
the second acquisition module is used for acquiring 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 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 connecting circuit in real time;
and the resistance processing unit is connected with the first obtaining unit and used for obtaining the first resistance value according to the voltage at two ends of the first contactor and the current and obtaining 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 using the following formulas:
wherein the content of the first and second substances,
r11 is used to represent the first resistance value;
Uband UaThe voltage of the two ends of the first contactor is respectively represented;
r21 is used to represent the second resistance value;
Udand UcFor respectively representing the voltages across the second contactor.
Preferably, the control module includes:
a first judging unit configured to judge whether at least one of the first resistance value and the second resistance value is greater than the standard resistance value and output a first judgment result;
the first processing unit is connected with the first judging unit and used for generating and outputting a first type of alarm signal when the first judging result is that at least one of the first resistance value and the second resistance value is greater than the standard resistance value;
and the second processing unit is connected with the first judging unit and 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 shows 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 of alarm signal according to the service life residual value.
Preferably, the second processing unit includes:
a first obtaining unit configured to obtain a first initial resistance value of the first contactor and a second initial resistance value of the second contactor;
the first processing component is connected with the first acquiring component and used for acquiring a first residual life value of the first contactor according to the first initial resistance value, the first resistance value and the standard resistance value and acquiring a second residual life value of the second contactor according to the second initial resistance value, the second resistance value and the standard resistance value;
the first judgment part is connected with the first processing part 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 or not and outputting a second judgment result;
and the second processing part is connected with the first judging part and used for generating and outputting a second type of alarm signal when the second judging result is that at least one of the first life residual value and the second life residual value is smaller than a preset life threshold value.
Preferably, the first processing unit obtains the first life residual value and the second life residual value by using the following formulas:
wherein the content of the first and second substances,
l1 is used to represent the first life residual;
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 residual;
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:
the first display execution unit is used for displaying display contents corresponding to the first type of alarm signals to the user on at least one display device arranged on the vehicle according to the first type of alarm signals; and/or
The second display execution unit is used for displaying display contents corresponding to the second type of alarm signals to the user on at least one display device arranged on the vehicle according to the second type of alarm signals; and/or
The first sound execution unit is used for playing sound content corresponding to the first indication to the user on at least one sound playing device arranged on the vehicle according to the first type of alarm signal; and/or
And the second sound execution unit is used for playing the sound content corresponding to the second type of alarm signal to the user on at least one sound playing device arranged on the vehicle according to the second type of alarm signal.
The technical scheme has the following advantages or beneficial effects: the application provides a method and a system for monitoring the service life of a high-voltage contactor in real time, which judge the magnitude relation between a current resistance value and a standard value and the magnitude relation between a current service life residual value and a corresponding residual value threshold value through a voltage drop obtained in real time so as to accurately detect the current service life condition of the high-voltage contactor in real time, can avoid the problem of over-temperature caused by the fact that the high-voltage contactor cannot be predicted or early warned in advance after the service life is ended and is continuously used, and further can avoid the risk caused by the function failure of a battery or other high-voltage components.
Drawings
Fig. 1 is a schematic flow chart of a method for monitoring the lifetime of a high-voltage contactor in real time according to a preferred embodiment of the present application;
FIG. 2 is a schematic diagram of a battery connection circuit according to a preferred embodiment of the present application;
fig. 3 is a schematic flowchart illustrating a step S3 of a method for real-time monitoring of the lifetime of a high-voltage contactor according to a preferred embodiment of the present application;
fig. 4 is a schematic flowchart illustrating a step S4 of a method for real-time monitoring of the lifetime of a high-voltage contactor according to a preferred embodiment of the present application;
fig. 5 is a schematic structural diagram of a system for monitoring the lifetime of a high-voltage contactor in real time according to a preferred embodiment of the present application;
FIG. 6 is a schematic structural diagram of a second obtaining module according to a preferred embodiment of the present application;
FIG. 7 is a schematic diagram of a control module according to a preferred embodiment of the present application;
FIG. 8 is a schematic structural diagram of a second processing unit according to a 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 drawings and specific examples. The present application is not limited to this embodiment, and other embodiments may be included in the scope of the present application as long as they meet the gist of the present application.
The problem that misjudgment easily occurs in the process of detecting the high-voltage contactor based on historical experience variable quantity in the prior art is solved, and the current service life condition of the high-voltage contactor can be accurately detected through the magnitude relation between the voltage drop obtained in real time and the current resistance value and the standard value. The following specific technical means are all illustrations for realizing the gist of the present application, and it is understood that the embodiments described below and technical features in the embodiments can be combined with each other without conflict. Also, 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 the preferred embodiment of the present application, based on the above problems in the prior art, a method and a system for monitoring the lifetime of a high voltage contactor in real time are provided.
As shown in fig. 2, the battery connection circuit comprises a first contactor C1, a second contactor C2 and a battery pack B, wherein 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 method for monitoring the service life of the high-voltage contactor in real time 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 a standard resistance value.
Specifically, the service life of the contactor is monitored through the history variation of the temperature monitoring indirectly or the contact resistance in the prior art, 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 method for monitoring the service life of the high-voltage contactor in real time is applied to a battery connecting circuit, and alarms by acquiring the magnitude relation among the first resistance value of the first contactor C1, the second resistance value of the second contactor C2 and the standard resistance value 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 the voltage at two ends of the first contactor, the voltage at two ends of the second contactor and the current in the battery connecting circuit in real time;
step S2, a first resistance value is obtained from the voltage and current across the first contactor, and a second resistance value is obtained from the voltage and current across the second contactor.
In particular, the first contactor may be connected in series between the positive pole of the battery pack and a positive pole access point, and correspondingly, the first contactor may be the positive pole contactor, and the second contactor may be connected in series between the negative pole of the battery pack and a negative pole access point, and correspondingly, the second contactor may be the negative pole 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 in a high-voltage acquisition modebAnd UaThe 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 the two ends of the second contactor can be acquired in a high-voltage acquisition modedAnd UcThe 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, in which the U is the voltage between the two ends of the first contactorb＞UaTherefore, the first resistance in the charged state can be obtained by the following formulaThe value:
and when in the discharging state, the voltage between the two ends of the first contactor is Ub＜UaTherefore, the first resistance value in the discharge state can be obtained by the following formula:
correspondingly, the second resistance value of the second contactor is also according to the above, when in the charging state, the voltage between the two ends of the second contactor is Ud＞UcTherefore, the second resistance value in the state of charge can be obtained by the following equation:
while in the discharging state, the voltage between two ends of the second contactor is Ud＜UcTherefore, the second resistance value in the discharge state can be obtained by the following formula:
in a preferred embodiment of the present invention, as shown in fig. 3, a method for alarming based on a first resistance value, a second resistance value, and a standard resistance value includes:
step S3, determining whether at least one of the first resistance value and the second resistance value is greater than a standard resistance value:
if yes, performing first-class alarm;
if not, go to step S4;
and step S4, acquiring 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 performing a second type of alarm.
Specifically, after the first resistance value and the second resistance value are obtained, the relationship between the first resistance value and the standard resistance value and the relationship between the second resistance value and the standard resistance value need to be determined, 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, a first type of alarm can be performed, and conversely, if neither the first resistance value nor the second resistance value is greater than the standard resistance value, the residual life value of the high-voltage contactor can be obtained according to the first resistance value, the second resistance value and the standard resistance value, and a second type of alarm can.
Further, the first type of alarm refers to end-of-life alarm, and correspondingly, the second type of alarm refers to residual life value early warning, and through timely alarm of the two types of content, the problem of over-temperature caused by continuous use due to failure of prediction or early warning in advance after the end of the service life of the high-voltage contactor can be solved, and risks caused by function failure 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 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 life residual value and the second life residual value is less than a preset life threshold:
if yes, performing second-class alarm, and then quitting the process;
if not, the process is exited.
Specifically, in the process of obtaining the life residual value of the high-voltage contactor and performing the second type of alarm according to the first resistance value, the second resistance value and the standard resistance value, first, the initial resistance value of the first contactor may be obtained in advance according to the voltage at the two ends of the first contactor in the initial state and the current value in the circuit, and correspondingly, the initial resistance value of the second contactor may be obtained in advance according to the voltage at the two ends of the second contactor in the initial state and the current value in the circuit; and then, acquiring the first life residual value, 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, and if at least one of the first life residual value and the second life residual value is smaller than a preset life threshold value, namely 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, performing second type alarm.
In the process of acquiring the first residual life value, the first residual life value L1 of the first contactor may be acquired according to the first initial resistance value R10 acquired in advance, the first resistance value R11 and the standard resistance value R0 acquired in real time, and the following formula:
accordingly, in the process of acquiring the second residual life value, the second residual life value L2 of the second contactor may be acquired according to the second initial resistance value R20 acquired in advance, 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, 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, and step S4 is to display the display content corresponding to the second type of alarm to the user on 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 devices in the vehicle can be a central control screen, a secondary screen and an instrument panel, and when the display contents are displayed on the display devices, the characters and/or pictures and/or images corresponding to the alarm types can be acquired and displayed on the display devices.
In a preferred embodiment of the present invention, step S3 is to display the audio content corresponding to the first type of alarm to the user on at least one audio playback device, and step S4 is to display the audio content corresponding to the second type of alarm to the user on at least one audio playback device. Specifically, for a battery connection circuit of an electric vehicle, sound content may be pre-stored, the sound content may be an effect sound and/or a voice corresponding To a first type of alarm and a second type of alarm, when the sound content is played on a sound playing device, the effect sound and/or the voice of the corresponding alarm type may be acquired and played on the sound playing device, a Text corresponding To a first indication may be pre-stored, and a voice synthesis engine, such as a Text To Speech (TTS) engine, may be provided, when the sound playing device is played on the first type of alarm or the second type of alarm, the corresponding Text may be acquired first, and then the voice synthesis engine is performed To form a 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 in the vehicle is in an occupied state, the collected voltage across the first contactor, the collected voltage across the second contactor, and the collected current across the second contactor may be sent to a cloud end remotely connected to 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 a judgment is performed according to a magnitude relationship between the first resistance, the second resistance, and a standard resistance value, and an alarm signal is generated according to a judgment result and fed back to a vehicle end.
A real-time monitoring system for the service life of a high-voltage contactor 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 the anode of the battery pack and an anode access point, and the second contactor is connected in series between the cathode of the battery pack and a cathode access point;
as shown in fig. 5, the real-time monitoring system for the service life of the high-voltage contactor comprises:
the first acquisition module 1 is used for acquiring a standard resistance value of the high-voltage contactor;
the second acquisition module 2 is used for acquiring a first resistance value and a second resistance value of the high-voltage contactor in real time;
and the control module 3 is connected with the first acquisition module 1 and the second acquisition module 2 and 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 voltage drop obtained in real time and the current resistance value and the standard value, and the detection process is specifically described above, so that the details are not repeated. Furthermore, the current service life condition of the high-voltage contactor can be accurately detected in real time, the problem of over-temperature caused by continuous use due to the fact that the service life of the high-voltage contactor cannot be predicted or early warned in advance after the service life of the high-voltage contactor is ended can be avoided, and therefore risks caused by functional failures of batteries or other high-voltage components can be avoided.
In a preferred embodiment of the present invention, as shown in fig. 6, the second obtaining module 2 includes:
the first acquisition unit 21 is used for acquiring 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 the resistance 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, first, the first acquiring unit 21 may acquire the current I in the circuit, and the voltage U across the first contactorbAnd UaThen, the resistance processing unit 22 can obtain the first resistance value by using the following formula：
In the process of acquiring the second resistance value of the second contactor, the first acquiring unit 21 may acquire the current I in the circuit, and acquire the voltage U at two ends of the second contactordAnd UcThen, the resistance value processing unit 22 may obtain the second resistance value by using the following formula:
in a preferred embodiment of the present invention, as shown in fig. 7, the control module 3 includes:
a first judgment unit 31 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 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 of alarm signal when the first judgment result is that at least one of the first resistance value and the second resistance value is greater than the standard resistance value;
and the second processing unit 33 is connected to the first judging unit 31, and is configured to, when the first judgment result is that neither the first resistance value nor the second resistance value is greater than the standard resistance value, obtain the residual life value of the high-voltage contactor according to the first resistance value, the second resistance value, and the standard resistance value, and generate and output a second type of alarm signal according to the residual life value.
Specifically, after the first resistance value and the second resistance value are obtained, the first determining unit 31 is required to determine the magnitude relationship between the first resistance value and the standard resistance value, and 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 a first type of 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 remaining life value of the high voltage contactor according to the first resistance value, the second resistance value, and the standard resistance value, and perform a second type of alarm.
In a preferred embodiment of the present invention, as shown in fig. 8, the second processing unit 33 includes:
a first obtaining unit 331 configured to obtain 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 residual life 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 residual life value of the second contactor according to the second initial resistance value, the second resistance value and the standard resistance value;
a first determining unit 333, connected to the first processing unit 332, for determining whether at least one of the first remaining life value and the second remaining life value is smaller than a preset life threshold value and outputting a second determination result;
the second processing unit 334, connected to the first determining unit 333, is configured to generate and output a second type of alarm signal when the second determination result is that at least one of the first remaining life value and the second remaining life value is smaller than a preset life threshold value.
Specifically, the first obtaining part 331 may obtain an initial resistance value of the first contactor according to a voltage across the first contactor in an initial state and a current value in a circuit, and obtain an initial resistance value of the second contactor in advance according to a voltage across the second contactor in an initial state and a current value in a circuit; the first processing component 332 obtains a second residual life 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 component 333 judges that at least one of the first residual life value and the second residual life value is smaller than a preset life threshold value, that is, when the first judging component 333 judges that the first residual life value is smaller than the life threshold value, or the second residual life value is smaller than the life threshold value, or both the first residual life value and the second residual life value are smaller than the life threshold value, the second processing component 334 performs the second type of alarm.
In the process of acquiring the first residual life value by the first processing unit 332, the first residual life value L1 of the first contactor may be acquired according to the first initial resistance value R10 acquired by the first acquiring unit 331 in advance, the first resistance value R11 and the standard resistance value R0 acquired in real time, and the following formula:
accordingly, in the process of acquiring the second residual life value by the first processing unit 332, the second residual life value L2 of the second contactor may be acquired according to the second initial resistance value R20 acquired by the first acquiring unit 331 in advance, 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 a display content corresponding to the first type of alarm signal to a user on at least one display device 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 executing unit 35 for displaying the display content corresponding to the second type of alarm signal to the user on the at least one display device according to the second type of alarm signal.
In a preferred embodiment of the present invention, the control module 3 may include a first sound executing unit 36, configured to play the sound content corresponding to the first indication to the user on at least one sound playing device 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, configured to play the sound content corresponding to the second type of alarm signal to the user on the at least one sound playing device according to the second type of alarm signal.
Specifically, the control module 3 may include a first display execution unit 34 for displaying the display content corresponding to the first type of alarm to the user on at least one display device provided in the vehicle according to the first type of alarm signal, and the control module 3 may further include a second display execution unit 35 for displaying the display content corresponding to the second type of alarm to the user on the at least one display device provided in 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 respectively on at least one display device provided in the vehicle according to the first type of alarm signal and the second type of alarm signal, further, the display contents may be texts and/or pictures and/or images corresponding to the first indication, the display device may be a dashboard facing the main driver seat, besides a display screen facing the secondary driver seat, or a central control screen between the main driver seat and the secondary driver seat, and correspondingly, the control module further includes a display storage unit for storing the display contents, the display storage unit can store the characters and/or pictures and/or images in advance, and the display execution unit reads the characters and/or pictures and/or images in the display storage unit and displays the characters and/or pictures and/or images on the display device.
As an alternative embodiment, the control module 3 may include a first sound execution unit 36 for displaying the display content corresponding to the first type of alarm to the user on at least one sound playing device provided in the vehicle according to the first type of alarm signal, and the control module 3 may further include a second sound execution unit 37 for displaying the display content corresponding to the second type of alarm to the user on at least one sound playing device provided in 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 may read the effect sound and/or the voice in the sound storage unit and play 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 provide a Speech synthesis engine, such as a Text To Speech (TTS) engine, and the sound execution unit may read the Text in the Text storage unit, form a voice through the Speech synthesis engine, and play the voice on the sound playing device.
Examples
The embodiment is a specific application example of a specific implementation mode for detecting the high-voltage contactor.
In this embodiment, the life condition of the high voltage contactor may be detected according to the resistance values of a first contactor connected in series between the positive pole of the battery pack and a positive pole access point and a second contactor connected in series between the negative pole of the battery pack and a negative pole access point 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 connecting 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 a standard resistance value, namely, the first resistance value is larger than the standard resistance value, or the second resistance value is larger than the standard resistance value, or both the first resistance value and the second resistance value are larger than the standard resistance value, performing a first type of alarm, conversely, if the first resistance value and the second resistance value are not larger than the standard resistance value, firstly, obtaining an initial resistance value of the first contactor according to the voltage at two ends of the first contactor in an initial state and the current value in a circuit, and obtaining an initial resistance value of the second contactor according to the voltage at two ends of the second contactor in the initial state and the current value in the circuit; and then, 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, and performing second-class 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.
While the invention has been described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention.
Claims (14)
1. A real-time monitoring method for the service life of a high-voltage contactor 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 the positive pole of the battery pack and a positive pole access point, and the second contactor is connected in series between the negative pole of the battery pack and a negative pole access point;
the method for monitoring the service life of the high-voltage contactor in real time 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.
2. The method for monitoring the service life of the high-voltage contactor in real time according to claim 1, wherein the method for acquiring the first resistance value and the second resistance value in real time comprises the following steps:
step S1, collecting the voltage at two ends of the first contactor, the voltage at two ends of the second contactor and the current in the battery connecting circuit in real time;
step S2, obtaining the first resistance value according to the voltage across the first contactor and the current, and obtaining the second resistance value according to the voltage across the second contactor and the current.
3. The method for monitoring the life of the high-voltage contactor in real time as claimed in claim 2, wherein the step S2 adopts the following formula:
wherein the content of the first and second substances,
r11 is used to represent the first resistance value;
Uband UaThe voltage of the two ends of the first contactor is respectively represented;
r21 is used to represent the second resistance value;
Udand UcFor respectively representing the voltages across the second contactor.
4. The method for monitoring the service life of the high-voltage contactor in real time as claimed in claim 1, wherein 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, determining whether at least one of the first resistance value and the second resistance value is greater than the standard resistance value:
if yes, performing first-class alarm;
if not, go to step S4;
and step S4, acquiring 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 performing a second type of alarm.
5. The method for monitoring the life of the high-voltage contactor in real time as claimed in claim 4, wherein the step S4 includes the following steps:
step S41, acquiring a first initial resistance value of the first contactor and a second initial resistance value of the second contactor;
step S42, obtaining a first residual life 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 residual life 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 life residual value and the second life residual value is less than a preset life threshold:
if yes, performing second-class alarm, and then exiting the process;
if not, exiting the process.
6. The method for monitoring the life of the high-voltage contactor in real time as claimed in claim 5, wherein the step S42 adopts the following formula:
wherein the content of the first and second substances,
l1 is used to represent the first life residual;
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 residual;
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.
7. The method according to claim 4, wherein the step S3 is implemented by displaying a 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, displaying 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, displaying the sound content corresponding to the first type alarm to the user on at least one sound playing device installed in the vehicle; and/or
In step S4, the sound content corresponding to the second type of alarm is displayed to the user on at least one sound playing device installed in the vehicle.
8. A real-time monitoring system for the service life of a high-voltage contactor 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 the anode of the battery pack and an anode access point, and the second contactor is connected in series between the cathode of the battery pack and a cathode access point;
high voltage contactor life real-time monitoring system includes:
the first acquisition module is used for acquiring a standard resistance value of the high-voltage contactor;
the second acquisition module is used for acquiring 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 used for alarming according to the first resistance value, the second resistance value and the standard resistance value.
9. The system for monitoring the life of the high-voltage contactor in real time as claimed in claim 8, wherein the second obtaining 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 connecting circuit in real time;
and the resistance processing unit is connected with the first obtaining unit and used for obtaining the first resistance value according to the voltage at two ends of the first contactor and the current and obtaining the second resistance value according to the voltage at two ends of the second contactor and the current.
10. The system according to claim 9, wherein the resistance processing unit obtains the first resistance value and the second resistance value by using the following formulas:
wherein the content of the first and second substances,
r11 is used to represent the first resistance value;
Uband UaThe voltage of the two ends of the first contactor is respectively represented;
r21 is used to represent the second resistance value;
Udand UcFor respectively representing the voltages across the second contactor.
11. The system of claim 8, wherein the control module comprises:
a first judging unit configured to judge whether at least one of the first resistance value and the second resistance value is greater than the standard resistance value and output a first judgment result;
the first processing unit is connected with the first judging unit and used for generating and outputting a first type of alarm signal when the first judging result is that at least one of the first resistance value and the second resistance value is greater than the standard resistance value;
and the second processing unit is connected with the first judging unit and 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 shows 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 of alarm signal according to the service life residual value.
12. The system according to claim 11, wherein the second processing unit comprises:
a first obtaining unit configured to obtain a first initial resistance value of the first contactor and a second initial resistance value of the second contactor;
the first processing component is connected with the first acquiring component and used for acquiring a first residual life value of the first contactor according to the first initial resistance value, the first resistance value and the standard resistance value and acquiring a second residual life value of the second contactor according to the second initial resistance value, the second resistance value and the standard resistance value;
the first judgment part is connected with the first processing part 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 or not and outputting a second judgment result;
and the second processing part is connected with the first judging part and used for generating and outputting a second type of alarm signal when the second judging result is that at least one of the first life residual value and the second life residual value is smaller than a preset life threshold value.
13. The system of claim 12, wherein the first processing component obtains the first life residual value and the second life residual value by using the following formulas:
wherein the content of the first and second substances,
l1 is used to represent the first life residual;
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 residual;
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.
14. The method for monitoring the service life of the high-voltage contactor in real time as claimed in claim 11, wherein the control module comprises:
the first display execution unit is used for displaying display contents corresponding to the first type of alarm signals to the user on at least one display device arranged on the vehicle according to the first type of alarm signals; and/or
The second display execution unit is used for displaying display contents corresponding to the second type of alarm signals to the user on at least one display device arranged on the vehicle according to the second type of alarm signals; and/or
The first sound execution unit is used for playing sound content corresponding to the first indication to the user on at least one sound playing device arranged on the vehicle according to the first type of alarm signal; and/or
And the second sound execution unit is used for playing the sound content corresponding to the second type of alarm signal to the user on at least one sound playing device arranged on the vehicle according to the second type of alarm signal.
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