CN113848524A - Method, device, terminal and storage medium for diagnosing current sensor fault by battery management system - Google Patents
Method, device, terminal and storage medium for diagnosing current sensor fault by battery management system Download PDFInfo
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Abstract
The invention relates to the technical field of automobile fault diagnosis, in particular to a method, a device, a terminal and a storage medium for diagnosing a current sensor fault by a battery management system. After the identification initialization, the change quantity of the total current in a certain SOC range and under a certain total voltage change condition in the charging and discharging process is used for diagnosing whether the current sensor has faults or not, so that whether the current sensor has faults or not can be detected qualitatively in real time in the charging and discharging process, qualitative analysis can be realized, and the fault detection efficiency is improved.
Description
Technical Field
The invention relates to the technical field of automobile fault diagnosis, in particular to a method, a device, a terminal and a storage medium for diagnosing a current sensor fault by a battery management system.
Background
With the rapid development of new energy electric vehicles in recent years, batteries have attracted attention as core components for safety and reliability. In order to ensure the driving and charging safety of the vehicle, the current and the total voltage of the power battery need to be monitored in real time; since the remaining battery capacity SOC is estimated, the accuracy and reliability of the current monitoring function of the battery management system are particularly important. In order to ensure the accuracy and effectiveness of the current monitoring function of the battery management system, a plurality of vehicle enterprises adopt a double-current-sensor mode, and the fault of the current sensor is identified by adding a redundancy design. The current sensor fault diagnosis means of the existing battery management system mainly diagnoses whether the temperature exceeds the working range or not, whether the sampling exceeds the range or not and the like through the current sensor. The diagnosis of the current sensor by the battery management system mainly focuses on detecting whether the hardware circuit has a short-circuit fault to the power supply and a short-circuit fault to the ground.
Disclosure of Invention
The embodiment of the invention provides a method, a device, a terminal and a storage medium for diagnosing a current sensor fault by a battery management system. The technical scheme is as follows:
according to a first aspect of embodiments of the present invention, there is provided a method for diagnosing a current sensor fault by a battery management system, the method being applied to an electronic device, the method including:
collecting an initial current value and an initial voltage value of the battery;
after the duration of T1, reading the current value and the current voltage value, and judging whether the current sensor has a fault according to the initial voltage value and the current voltage value, the initial current value and the current value;
when a charging and discharging process diagnosis instruction is received, recording the current time T2, reading the SOC at the time T2, the current value at the time T2 and the voltage value at the time T2, and judging whether to start a current sensor diagnosis process according to the SOC at the time T2;
when the current sensor diagnosis process is started, a diagnosis result is obtained according to a voltage change and current change relation model corresponding to the SOC at the time of T2, a voltage change value and a current change value, whether the current diagnosis result is informed or not is judged, and whether a fault occurs in the charging and discharging process of the current sensor is judged.
Preferably, the determining whether the current sensor has a fault according to the initial voltage value and the current voltage value, the initial current value and the current value includes:
if the initial voltage value and the current voltage value do not meet the first condition, the current sensor diagnosis of the initial condition is not executed; if the initial voltage value and the current voltage value meet the first condition, judging whether the initial current value and the current value meet a second condition, if so, judging that the current sensor is in a normal state, and sending a charge-discharge process diagnosis instruction; and if the second condition is not met, judging that the current sensor is in a fault state.
Preferably, the first condition is Vc1-Vc0 ≧ Δ Vc and Vd1-Vd0 ≦ Δ Vd, where Vc1 represents the current voltage value of the charging process, Vc0 represents the initial voltage value of the charging process, Δ Vc represents the voltage difference threshold of the preset initial condition diagnostic strategy of the charging process, Vd1 represents the current voltage value of the discharging process, Vd0 represents the initial voltage value of the discharging process, and Δ Vd represents the voltage difference threshold of the preset initial condition diagnostic strategy of the discharging process.
Preferably, the second condition is divided into a charging process and a discharging process;
when the charging process is carried out, Vc1-Vc0 ≧ Δ Vc, Ic 1< Ic0, wherein Ic1 represents the current value of the current charging process, and Ic0 represents the initial current value of the charging process;
id1 > Id0 when in the discharging process, Vd1-Vd0 ≦ Δ Vd, where Id1 represents the current value of the current charging process and Id0 represents the initial current value of the charging process.
Preferably, the determining whether to start the current sensor diagnostic process according to the SOC at time T2 includes:
acquiring a preset SOC minimum value SOCmin and a preset SOC maximum value SOCmax;
if SOC does not satisfy at time T2: at the time SOCmin < T2, SOC < SOCmax, the current sensor diagnosis in the current charge-discharge process is closed;
if SOC at time T2 satisfies: SOC < SOCmax at time SOCmin < T2, current sensor diagnostic is enabled.
Preferably, the determining whether the current diagnosis result is informed according to the voltage change and current change relation model corresponding to the SOC at the time T2, and the voltage change value and the current change value includes:
and recording a voltage change value and a current change value within a time length T from the time T2, and judging whether the diagnosis result is informed according to whether the voltage change value meets a third condition, wherein T represents the time for starting the current sensor for diagnosis periodically.
Preferably, the recording of the voltage change value and the current change value within the time period T from the time T2 includes:
when the voltage value is detected to change from the time T2, the changed voltage value and the changed current value are recorded, and the charging process obtains n voltage values Vc2n and n current values Ic2 n; n voltage values Vd2n and n current values Id2n are obtained in the discharging process; wherein n is a positive integer;
the charging process calculates a voltage variation value Δ Vcn from the voltage value Vc2n and the voltage value Vc2 at the time T2 according to the following equation (1):
ΔVcn＝Vc2n-Vc2……(1)
the current variation value Δ Icn is calculated from the current value Ic2n and the time T2 current value Ic2 according to the following formula (2):
ΔIcn＝Ic2n-Ic2……(2)
the discharge process calculates a voltage variation value Δ Vdn from the voltage value Vd2n and the voltage value Vd2 at the time T2 according to the following formula (3):
ΔVdn＝Vd2n-Vd2……(3)
the current change value Δ Idn is calculated from the current value Id2n and the current value Id2 at the time T2 according to the following formula (4):
ΔIdn＝Id2n-Id2……(4)。
according to a second aspect of the embodiments of the present invention, there is provided an apparatus for diagnosing a fault of a current sensor by a battery management system, the apparatus being applied to an electronic device, the apparatus including a current sensor, a control module, a diagnostic module, and an alarm module, wherein:
the current sensor is used for detecting the current value of the high-voltage battery in real time;
the control module is used for receiving an instruction of the battery management system and switching different condition diagnosis strategies;
the diagnosis module is used for receiving a voltage value, SOC (system on chip), temperature and a current value of the current sensor which are sent by the battery management system and diagnosing whether the current sensor has faults or not;
the alarm module is used for reporting the information that the current sensor is in the fault state.
Optionally, the diagnostic module is to:
when the diagnosis module receives a judgment instruction based on an initial condition, acquiring an initial current value and an initial voltage value of the battery management system;
after the duration of T1, the diagnosis module reads the current value and the current voltage value, and if the initial voltage value and the current voltage value do not meet the first condition, the current sensor diagnosis of the initial condition is not executed; if the initial voltage value and the current voltage value meet the first condition, judging whether the initial current value and the current value meet a second condition, if so, judging that the current sensor is in a normal state, and sending a charge-discharge process diagnosis instruction; if the second condition is not met, judging that the current sensor is in a fault state;
when the diagnosis module receives a charge and discharge process diagnosis instruction, recording the current time T2, reading the SOC at the time of T2, the current value at the time of T2 and the voltage value at the time of T2, and judging whether to start a current sensor diagnosis process according to the SOC at the time of T2;
when the diagnosis module receives an instruction for starting a current sensor diagnosis process, a corresponding voltage change and current change relation model is searched according to the SOC at the T2 moment, a voltage change value and a current change value in the time length T from the T2 moment are recorded, and whether the diagnosis result is trusted is judged according to whether the voltage change value meets a third condition.
Optionally, the diagnostic module is to:
acquiring a preset SOC minimum value SOCmin and a preset SOC maximum value SOCmax;
if SOC does not satisfy at time T2: at the time SOCmin < T2, SOC < SOCmax, the current sensor diagnosis in the current charge-discharge process is closed;
if SOC at time T2 satisfies: SOC < SOCmax at time SOCmin < T2, current sensor diagnostic is enabled.
Optionally, the diagnostic module is to:
and recording a voltage change value and a current change value within a time length T from the time T2, and judging whether the diagnosis result is informed according to whether the voltage change value meets a third condition, wherein T represents the time for starting the current sensor for diagnosis periodically.
Optionally, the diagnostic module is to:
the voltage change value and the current change value within the time period T from the time T2 comprise:
when the voltage value is detected to change from the time T2, the changed voltage value and the changed current value are recorded, and the charging process obtains n voltage values Vc2n and n current values Ic2 n; n voltage values Vd2n and n current values Id2n are obtained in the discharging process; wherein n is a positive integer;
the charging process calculates a voltage variation value Δ Vcn from the voltage value Vc2n and the voltage value Vc2 at the time T2 according to the following equation (1):
ΔVcn＝Vc2n-Vc2……(1)
the current variation value Δ Icn is calculated from the current value Ic2n and the time T2 current value Ic2 according to the following formula (2):
ΔIcn＝Ic2n-Ic2……(2)
the discharge process calculates a voltage variation value Δ Vdn from the voltage value Vd2n and the voltage value Vd2 at the time T2 according to the following formula (3):
ΔVdn＝Vd2n-Vd2……(3)
the current change value Δ Idn is calculated from the current value Id2n and the current value Id2 at the time T2 according to the following formula (4):
ΔIdn＝Id2n-Id2……(4)
according to a third aspect of the embodiments of the present invention, there is provided a terminal, including:
one or more processors;
a memory for storing the one or more processor-executable instructions;
wherein the one or more processors are configured to:
the method of the first aspect of the embodiments of the present invention is performed.
According to a fourth aspect of embodiments of the present invention, there is provided a non-transitory computer-readable storage medium, wherein instructions, when executed by a processor of a terminal, enable the terminal to perform the method of the first aspect of embodiments of the present invention.
According to a fifth aspect of embodiments of the present invention, there is provided an application program product, which, when running on a terminal, causes the terminal to perform the method of the first aspect of embodiments of the present invention.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
in the scheme, the principle of the fault diagnosis method is based on the complementary change relationship between the total voltage and the total current of the lithium battery in the charging and discharging processes. After the identification initialization, the change quantity of the total current in a certain SOC range and under a certain total voltage change condition in the charging and discharging process is used for diagnosing whether the current sensor has faults or not, so that whether the current sensor has faults or not can be detected qualitatively in real time in the charging and discharging process, qualitative analysis can be realized, and the fault detection efficiency is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a flowchart of a method for diagnosing a current sensor fault by a battery management system according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for diagnosing a current sensor fault in a battery management system according to an embodiment of the present invention;
fig. 3 is a block diagram of an apparatus for diagnosing a current sensor fault in a battery management system according to an embodiment of the present invention.
Fig. 4 is a schematic block diagram of a terminal structure according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments.
The embodiment of the invention provides a method for diagnosing a current sensor fault by a battery management system, which can be realized by a device for diagnosing the current sensor fault by the battery management system. As shown in fig. 1, the processing flow of the method for diagnosing the current sensor fault by the battery management system may include the following steps:
103, when a charging and discharging process diagnosis instruction is received, recording the current time T2, reading the SOC at the time T2, the current value at the time T2 and the voltage value at the time T2, and judging whether to start a current sensor diagnosis process according to the SOC at the time T2;
and step 104, when the current sensor diagnosis process is started, obtaining a diagnosis result according to the voltage change and current change relation model corresponding to the SOC at the time of T2, the voltage change value and the current change value, judging whether the diagnosis result is informed or not, and judging whether the current sensor fails in the charging and discharging process or not.
Optionally, the determining whether the current sensor fails according to the initial voltage value and the current voltage value, the initial current value and the current value includes:
if the initial voltage value and the current voltage value do not meet the first condition, the current sensor diagnosis of the initial condition is not executed; if the initial voltage value and the current voltage value meet the first condition, judging whether the initial current value and the current value meet a second condition, if so, judging that the current sensor is in a normal state, and sending a charge-discharge process diagnosis instruction; and if the second condition is not met, judging that the current sensor is in a fault state.
Optionally, the first condition is Vc1-Vc0 ≧ Δ Vc and Vd1-Vd0 ≦ Δ Vd, where Vc1 represents a current voltage value of the charging process, Vc0 represents an initial voltage value of the charging process, Δ Vc represents a voltage difference threshold of an initial condition diagnostic strategy of a preset charging process, Vd1 represents a current voltage value of the discharging process, Vd0 represents an initial voltage value of the discharging process, and Δ Vd represents a voltage difference threshold of an initial condition diagnostic strategy of a preset discharging process.
Optionally, the second condition is divided into a charging process and a discharging process;
when the charging process is carried out, Vc1-Vc0 ≧ Δ Vc, Ic 1< Ic0, wherein Ic1 represents the current value of the current charging process, and Ic0 represents the initial current value of the charging process;
id1 > Id0 when in the discharging process, Vd1-Vd0 ≦ Δ Vd, where Id1 represents the current value of the current charging process and Id0 represents the initial current value of the charging process.
Optionally, the determining whether to start the current sensor diagnostic process according to the SOC at time T2 includes:
acquiring a preset SOC minimum value SOCmin and a preset SOC maximum value SOCmax;
if SOC does not satisfy at time T2: at the time SOCmin < T2, SOC < SOCmax, the current sensor diagnosis in the current charge-discharge process is closed;
if SOC at time T2 satisfies: SOC < SOCmax at time SOCmin < T2, a start current sensor diagnostic is issued.
Preferably, the determining whether the current diagnosis result is informed according to the voltage change and current change relation model corresponding to the SOC at the time T2, and the voltage change value and the current change value includes:
and recording a voltage change value and a current change value within a time length T from the time T2, and judging whether the diagnosis result is informed according to whether the voltage change value meets a third condition, wherein T represents the time for starting the current sensor for diagnosis periodically.
Preferably, the recording of the voltage change value and the current change value within the time period T from the time T2 includes:
when the voltage value is detected to change from the time T2, the changed voltage value and the changed current value are recorded, and the charging process obtains n voltage values Vc2n and n current values Ic2 n; n voltage values Vd2n and n current values Id2n are obtained in the discharging process; wherein n is a positive integer;
the charging process calculates a voltage variation value Δ Vcn from the voltage value Vc2n and the voltage value Vc2 at the time T2 according to the following equation (1):
ΔVcn＝Vc2n-Vc2……(1)
the current variation value Δ Icn is calculated from the current value Ic2n and the time T2 current value Ic2 according to the following formula (2):
ΔIcn＝Ic2n-Ic2……(2)
the discharge process calculates a voltage variation value Δ Vdn from the voltage value Vd2n and the voltage value Vd2 at the time T2 according to the following formula (3):
ΔVdn＝Vd2n-Vd2……(3)
the current change value Δ Idn is calculated from the current value Id2n and the current value Id2 at the time T2 according to the following formula (4):
ΔIdn＝Id2n-Id2……(4)。
the principle of the fault diagnosis method is that the complementary change relationship of total voltage and total current of the lithium battery in the charging and discharging process is utilized. After the identification initialization, the change quantity of the total current in a certain SOC range and under a certain total voltage change condition in the charging and discharging process is used for diagnosing whether the current sensor has faults or not, so that whether the current sensor has faults or not can be detected qualitatively in real time in the charging and discharging process, qualitative analysis can be realized, and the fault detection efficiency is improved.
The embodiment of the invention provides a method for diagnosing a fault of a current sensor by a battery management system, which can be realized by electronic equipment, wherein the electronic equipment can be a terminal or a server. As shown in the flow chart of fig. 2, the processing flow of the method for diagnosing the current sensor fault by the battery management system may include the following steps:
in one possible embodiment, the battery management system wakes up, initializes, and initiates current sensor diagnostics based on initial conditions.
And 203, if the initial voltage value and the current voltage value do not meet the first condition, judging that the initial condition diagnosis is not enabled, and not executing the current sensor diagnosis of the initial condition.
The first condition is that Vc1-Vc0 is more than or equal to delta Vc and Vd1-Vd0 is more than or equal to delta Vd;
wherein, Vc1 represents the current voltage value of the charging process, Vc0 represents the initial voltage value of the charging process, Δ Vc represents the voltage difference threshold of the initial condition diagnostic strategy of the preset charging process, Vd1 represents the current voltage value of the discharging process, Vd0 represents the initial voltage value of the discharging process, and Δ Vd represents the voltage difference threshold of the initial condition diagnostic strategy of the preset discharging process.
And 204, if the initial voltage value and the current voltage value meet the first condition, starting a current sensor diagnosis strategy.
And step 205, if the second condition is met, judging that the current sensor is in a normal state, and if the second condition is not met, judging that the current sensor is in a fault state.
The second condition is divided into a charging process and a discharging process, and when the charging process is carried out, Vc1-Vc0 ≧ Δ Vc, Ic 1< Ic0, wherein Ic1 represents the current value of the current charging process, and Ic0 represents the initial current value of the charging process. Id1 > Id0 when in the discharging process, Vd1-Vd0 ≦ Δ Vd, where Id1 represents the current value of the current charging process and Id0 represents the initial current value of the charging process.
In a possible implementation manner, if the first condition is satisfied and the second condition is satisfied at the same time, it indicates that the current sensor is normal, and the process jumps to the diagnosis in the charging and discharging process.
If the first condition is met and the second condition is not met, the current sensor fault is described, and the battery management system reports the current sensor fault.
If the first condition is not met, the initial condition detection process is not started, and the diagnosis is carried out in the charging and discharging process.
And step 207, recording the current time T2 when the charging and discharging process diagnosis command is received, and reading the SOC at the time T2 as X1, the current value at the time T2 and the voltage value at the time T2.
And step 208, acquiring a preset SOC minimum value SOCmin and a preset SOC maximum value SOCmax. If X1 does not satisfy: SOCmin < X1< SOCmax, then the current sensor diagnostic is turned off for the current charge-discharge process if X1 satisfies: SOCmin < X1< SOCmax, then the current sensor diagnostic is enabled.
And step 209, searching a corresponding voltage change and current change relation model according to the X1, and recording a voltage change value and a current change value within the time length T from the time T2.
The voltage change and current change relation model is a complementary relation of a certain proportion of current change and voltage change according to a certain SOC range, a certain temperature range and a certain cell life condition. The complementary relationship between the current change and the voltage change exists all the time in the charging and discharging process, and the variation of different battery systems is slightly different. The model can be obtained by calibrating the battery performance and the real vehicle.
In a possible embodiment, when a change in voltage value is detected from time T2, the changed voltage value and the changed current value are recorded, and the charging process obtains n voltage values Vc2n and n current values Ic2 n; n voltage values Vd2n and n current values Id2n are obtained in the discharging process; wherein n is a positive integer;
the charging process calculates a voltage variation value Δ Vcn from the voltage value Vc2n and the voltage value Vc2 at the time T2 according to the following equation (1):
ΔVcn＝Vc2n-Vc2……(1)
the current variation value Δ Icn is calculated from the current value Ic2n and the time T2 current value Ic2 according to the following formula (2):
ΔIn＝I2n-I2……(2)
the discharge process calculates a voltage variation value Δ Vdn from the voltage value Vd2n and the voltage value Vd2 at the time T2 according to the following formula (3):
ΔVdn＝Vd2n-Vd2……(3)
the current change value Δ Idn is calculated from the current value Id2n and the current value Id2 at the time T2 according to the following formula (4):
ΔIdn＝Id2n-Id2……(4)
and step 210, judging whether the diagnosis result is trusted according to whether the voltage change value meets a third condition.
The third condition includes:
acquiring voltage difference threshold values delta Vdb and delta Vcb of a preset charging and discharging diagnosis strategy; wherein Δ Vcb is a voltage difference threshold of the charging process diagnostic strategy; Δ Vdb is the voltage difference threshold for the discharge process diagnostic strategy.
Determining the number m of current change values of Δ Vcn > Δ Vcb in Δ Vcn;
if m is less than XC, judging that the diagnosis result can not be trusted;
and if m is larger than or equal to XC, performing current sensor diagnosis according to the current change value, wherein XC charging process represents the number of samples for fetching.
Judging the number m of current change values of which delta Vdn is less than or equal to delta Vdb in delta Vdn;
if m is less than XD, judging that the diagnosis result can not be trusted;
if m is larger than or equal to XD, the current sensor diagnosis is carried out according to the current change value, wherein the XD discharge process represents the number of samples to be informed.
And step 211, judging whether the current sensor fails in the charging and discharging process according to whether the current change value meets a fourth condition.
The fourth condition includes:
calculating an average value Icuvg of the current change value delta Icn in the charging process;
calculating an average value Idavg of the current change value delta Idn in the discharging process;
acquiring a current variation range and a charging error range of a charging voltage variation and current variation relation model, and determining a charging superposition range of the charging current variation range and the charging error range; obtaining a current variation range and a discharge error range of a discharge voltage variation and current variation relation model, and determining a discharge superposition range of the discharge current variation range and the discharge error range;
and the charging process compares the average value Icuvg with the charging superposition range, if the average value Icuvg exceeds the charging superposition range, the current sensor is judged to be in a fault state, and if the average value Icuvg does not exceed the charging superposition range, the current sensor is judged to be in a normal state.
And comparing the average value Idavg with the discharge superposition range in the discharge process, judging that the current sensor is in a fault state if the average value Idavg exceeds the discharge superposition range, and judging that the current sensor is in a normal state if the average value Idavg does not exceed the discharge superposition range.
The principle of the fault diagnosis method is that the complementary change relationship of total voltage and total current of the lithium battery in the charging and discharging process is utilized. After the identification initialization, the change quantity of the total current in a certain SOC range and under a certain total voltage change condition in the charging and discharging process is used for diagnosing whether the current sensor has faults or not, so that whether the current sensor has faults or not can be detected qualitatively in real time in the charging and discharging process, qualitative analysis can be realized, and the fault detection efficiency is improved.
Fig. 3 is a block diagram illustrating an apparatus for a battery management system to diagnose current sensor faults in accordance with an exemplary embodiment. Referring to fig. 3, the apparatus includes a current sensor 310, a control module 320, a diagnostic module 330, and an alarm module 340, wherein:
the current sensor 310 is used for detecting the current value of the high-voltage battery in real time;
the control module 320 is used for receiving instructions of the battery management system and switching different condition diagnosis strategies;
the diagnosis module 330 is configured to receive a voltage value, an SOC, and a temperature sent by the battery management system, and a current value of the current sensor, and diagnose whether the current sensor has a fault;
the alarm module 340 is configured to report information that the current sensor is in a fault state.
Optionally, the diagnosis module 330 is configured to:
when the diagnosis module receives a judgment instruction based on an initial condition, acquiring an initial current value and an initial voltage value of the battery management system;
after the duration of T1, the diagnosis module reads the current value and the current voltage value, and if the initial voltage value and the current voltage value do not meet the first condition, the current sensor diagnosis of the initial condition is not executed; if the initial voltage value and the current voltage value meet the first condition, judging whether the initial current value and the current value meet a second condition, if so, judging that the current sensor is in a normal state, and sending a charge-discharge process diagnosis instruction; if the second condition is not met, judging that the current sensor is in a fault state;
when the diagnosis module receives a charge and discharge process diagnosis instruction, recording the current time T2, reading the SOC at the time of T2, the current value at the time of T2 and the voltage value at the time of T2, and judging whether to start a current sensor diagnosis process according to the SOC at the time of T2;
when the diagnosis module receives an instruction for starting a current sensor diagnosis process, a corresponding voltage change and current change relation model is searched according to the SOC at the T2 moment, a voltage change value and a current change value in the time length T from the T2 moment are recorded, and whether the diagnosis result is trusted is judged according to whether the voltage change value meets a third condition.
Optionally, the diagnosis module 330 is configured to:
acquiring a preset SOC minimum value SOCmin and a preset SOC maximum value SOCmax;
if SOC does not satisfy at time T2: at the time SOCmin < T2, SOC < SOCmax, the current sensor diagnosis in the current charge-discharge process is closed;
if SOC at time T2 satisfies: SOC < SOCmax at time SOCmin < T2, current sensor diagnostic is enabled.
Optionally, the diagnosis module 330 is configured to:
and recording a voltage change value and a current change value within a time length T from the time T2, and judging whether the diagnosis result is informed according to whether the voltage change value meets a third condition, wherein T represents the time for starting the current sensor for diagnosis periodically.
Optionally, the diagnosis module 330 is configured to:
the voltage change value and the current change value in the time period T1 from the time T2 include:
when the voltage value is detected to change from the time T2, the changed voltage value and the changed current value are recorded, and the charging process obtains n voltage values Vc2n and n current values Ic2 n; n voltage values Vd2n and n current values Id2n are obtained in the discharging process; wherein n is a positive integer;
the charging process calculates a voltage variation value Δ Vcn from the voltage value Vc2n and the voltage value Vc2 at the time T2 according to the following equation (1):
ΔVcn＝Vc2n-Vc2……(1)
the current variation value Δ Icn is calculated from the current value Ic2n and the time T2 current value Ic2 according to the following formula (2):
ΔIcn＝Ic2n-Ic2……(2)
the discharge process calculates a voltage variation value Δ Vdn from the voltage value Vd2n and the voltage value Vd2 at the time T2 according to the following formula (3):
ΔVdn＝Vd2n-Vd2……(3)
the current change value Δ Idn is calculated from the current value Id2n and the current value Id2 at the time T2 according to the following formula (4):
ΔIdn＝Id2n-Id2……(4)。
example four
Fig. 4 is a block diagram of a terminal according to an embodiment of the present application, where the terminal may be the terminal in the foregoing embodiment. The terminal 400 may be a portable mobile terminal such as: smart phones, tablet computers. The terminal 400 may also be referred to by other names such as user equipment, portable terminal, etc.
Generally, the terminal 400 includes: a processor 401 and a memory 402.
In some embodiments, the terminal 400 may further optionally include: a peripheral interface 403 and at least one peripheral. Specifically, the peripheral device includes: at least one of radio frequency circuitry 404, touch screen display 405, camera 406, audio circuitry 407, positioning components 408, and power supply 409.
The peripheral interface 403 may be used to connect at least one peripheral related to I/O (Input/Output) to the processor 401 and the memory 402. In some embodiments, processor 401, memory 402, and peripheral interface 403 are integrated on the same chip or circuit board; in some other embodiments, any one or two of the processor 401, the memory 402 and the peripheral interface 403 may be implemented on a separate chip or circuit board, which is not limited by this embodiment.
The Radio Frequency circuit 404 is used for receiving and transmitting RF (Radio Frequency) signals, also called electromagnetic signals. The radio frequency circuitry 404 communicates with communication networks and other communication devices via electromagnetic signals. The rf circuit 404 converts an electrical signal into an electromagnetic signal to transmit, or converts a received electromagnetic signal into an electrical signal. Optionally, the radio frequency circuit 404 includes: an antenna system, an RF transceiver, one or more amplifiers, a tuner, an oscillator, a digital signal processor, a codec chipset, a subscriber identity module card, and so forth. The radio frequency circuitry 404 may communicate with other terminals via at least one wireless communication protocol. The wireless communication protocols include, but are not limited to: the world wide web, metropolitan area networks, intranets, generations of mobile communication networks (2G, 3G, 4G, and 5G), Wireless local area networks, and/or WiFi (Wireless Fidelity) networks. In some embodiments, the rf circuit 404 may further include NFC (Near Field Communication) related circuits, which are not limited in this application.
The touch display screen 405 is used to display a UI (User Interface). The UI may include graphics, text, icons, video, and any combination thereof. The touch display screen 405 also has the ability to capture touch signals on or over the surface of the touch display screen 405. The touch signal may be input to the processor 401 as a control signal for processing. The touch screen display 405 is used to provide virtual buttons and/or a virtual keyboard, also referred to as soft buttons and/or a soft keyboard. In some embodiments, the touch display screen 405 may be one, providing the front panel of the terminal 400; in other embodiments, the touch screen display 405 may be at least two, respectively disposed on different surfaces of the terminal 400 or in a folded design; in still other embodiments, the touch display 405 may be a flexible display disposed on a curved surface or on a folded surface of the terminal 400. Even more, the touch screen display 405 can be arranged in a non-rectangular irregular pattern, i.e., a shaped screen. The touch screen 405 may be made of LCD (Liquid Crystal Display), OLED (Organic Light-Emitting Diode), and other materials.
The camera assembly 406 is used to capture images or video. Optionally, camera assembly 406 includes a front camera and a rear camera. Generally, a front camera is used for realizing video call or self-shooting, and a rear camera is used for realizing shooting of pictures or videos. In some embodiments, the number of the rear cameras is at least two, and each of the rear cameras is any one of a main camera, a depth-of-field camera and a wide-angle camera, so that the main camera and the depth-of-field camera are fused to realize a background blurring function, and the main camera and the wide-angle camera are fused to realize a panoramic shooting function and a VR (Virtual Reality) shooting function. In some embodiments, camera assembly 406 may also include a flash. The flash lamp can be a monochrome temperature flash lamp or a bicolor temperature flash lamp. The double-color-temperature flash lamp is a combination of a warm-light flash lamp and a cold-light flash lamp, and can be used for light compensation at different color temperatures.
The audio circuit 407 is used to provide an audio interface between the user and the terminal 400. The audio circuit 407 may include a microphone and a speaker. The microphone is used for collecting sound waves of a user and the environment, converting the sound waves into electric signals, and inputting the electric signals to the processor 401 for processing, or inputting the electric signals to the radio frequency circuit 404 for realizing voice communication. For the purpose of stereo sound collection or noise reduction, a plurality of microphones may be provided at different portions of the terminal 400. The microphone may also be an array microphone or an omni-directional pick-up microphone. The speaker is used to convert electrical signals from the processor 401 or the radio frequency circuit 404 into sound waves. The loudspeaker can be a traditional film loudspeaker or a piezoelectric ceramic loudspeaker. When the speaker is a piezoelectric ceramic speaker, the speaker can be used for purposes such as converting an electric signal into a sound wave audible to a human being, or converting an electric signal into a sound wave inaudible to a human being to measure a distance. In some embodiments, audio circuitry 407 may also include a headphone jack.
The positioning component 408 is used to locate the current geographic position of the terminal 400 for navigation or LBS (Location Based Service). The Positioning component 408 can be a Positioning component based on the Global Positioning System (GPS) in the united states, the beidou System in china, or the galileo System in russia.
The power supply 409 is used to supply power to the various components in the terminal 400. The power source 409 may be alternating current, direct current, disposable or rechargeable. When the power source 409 includes a rechargeable battery, the rechargeable battery may be a wired rechargeable battery or a wireless rechargeable battery. The wired rechargeable battery is a battery charged through a wired line, and the wireless rechargeable battery is a battery charged through a wireless coil. The rechargeable battery may also be used to support fast charge technology.
Those skilled in the art will appreciate that the configuration shown in fig. 4 is not intended to be limiting of terminal 400 and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components may be used.
EXAMPLE five
In an exemplary embodiment, a computer-readable storage medium is further provided, on which a computer program is stored, which when executed by a processor, implements a method for evaluating control performance of an air conditioning multi-temperature zone in a passenger compartment of a vehicle, as provided in all inventive embodiments of this application.
Any combination of one or more computer-readable media may be employed. The computer readable medium may be a computer readable signal medium or a computer readable storage medium. A computer readable storage medium may be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, or device, or any combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium would include the following: an electrical connection having one or more wires, a portable computer diskette, a hard disk, a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, or device.
A computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, for example, in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination thereof. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, or device.
Program code embodied on a computer readable medium may be transmitted using any appropriate medium, including but not limited to wireless, wireline, optical fiber cable, RF, etc., or any suitable combination of the foregoing.
Computer program code for carrying out operations for aspects of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, Smalltalk, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or the connection may be made to an external computer (for example, through the Internet using an Internet service provider).
EXAMPLE six
In an exemplary embodiment, an application product is also provided, which includes one or more instructions executable by the processor 401 of the system to perform the method for evaluating the performance of controlling the multiple temperature zones of the air conditioner in the passenger compartment of the vehicle.
While embodiments of the invention have been disclosed above, it is not intended to be limited to the uses set forth in the specification and examples. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.
Claims (10)
1. A method of diagnosing a current sensor fault in a battery management system, the method comprising:
collecting an initial current value and an initial voltage value of the battery;
after the duration of T1, reading the current value and the current voltage value, and judging whether the current sensor has a fault according to the initial voltage value and the current voltage value, the initial current value and the current value;
when a charging and discharging process diagnosis instruction is received, recording the current time T2, reading the SOC at the time T2, the current value at the time T2 and the voltage value at the time T2, and judging whether to start a current sensor diagnosis process according to the SOC at the time T2;
when the current sensor diagnosis process is started, a diagnosis result is obtained according to a voltage change and current change relation model corresponding to the SOC at the time of T2, a voltage change value and a current change value, whether the current diagnosis result is informed or not is judged, and whether a fault occurs in the charging and discharging process of the current sensor is judged.
2. The method of claim 1, wherein determining whether the current sensor has a fault according to the initial voltage value and the current voltage value, and the initial current value and the current value comprises:
if the initial voltage value and the current voltage value do not meet the first condition, the current sensor diagnosis of the initial condition is not executed; if the initial voltage value and the current voltage value meet the first condition, judging whether the initial current value and the current value meet a second condition, if so, judging that the current sensor is in a normal state, and sending a charge-discharge process diagnosis instruction; and if the second condition is not met, judging that the current sensor is in a fault state.
3. The method of claim 2,
the first conditions are Vc1-Vc0 ≧ delta Vc and Vd1-Vd0 ≦ delta Vd, wherein Vc1 represents a current voltage value of a charging process, Vc0 represents an initial voltage value of the charging process, delta Vc represents a voltage difference threshold value of an initial condition diagnosis strategy of a preset charging process, Vd1 represents a current voltage value of a discharging process, Vd0 represents an initial voltage value of the discharging process, and delta Vd represents a voltage difference threshold value of the initial condition diagnosis strategy of the preset discharging process.
4. The method according to claim 3, wherein the second condition is divided into a charging process and a discharging process;
when the charging process is carried out, Vc1-Vc0 ≧ Δ Vc, Ic 1< Ic0, wherein Ic1 represents the current value of the current charging process, and Ic0 represents the initial current value of the charging process;
id1 > Id0 when in the discharging process, Vd1-Vd0 ≦ Δ Vd, where Id1 represents the current value of the current charging process and Id0 represents the initial current value of the charging process.
5. The method of claim 1, wherein the determining whether to initiate the current sensor diagnostic process according to the SOC at time T2 comprises:
acquiring a preset SOC minimum value SOCmin and a preset SOC maximum value SOCmax;
if SOC does not satisfy at time T2: at the time SOCmin < T2, SOC < SOCmax, the current sensor diagnosis in the current charge-discharge process is closed;
if SOC at time T2 satisfies: SOC < SOCmax at time SOCmin < T2, current sensor diagnostic is enabled.
6. The method of claim 1, wherein the determining whether the current diagnosis result is trusted according to the relation model between the voltage change and the current change corresponding to the SOC at the time T2, and the voltage change value and the current change value comprises:
and recording a voltage change value and a current change value within a time length T from the time T2, and judging whether the diagnosis result is informed according to whether the voltage change value meets a third condition, wherein T represents the time for starting the current sensor for diagnosis periodically.
7. The method of claim 6, wherein said recording the voltage change value and the current change value for a period of time T from time T2 comprises:
when the voltage value is detected to change from the time T2, the changed voltage value and the changed current value are recorded, and the charging process obtains n voltage values Vc2n and n current values Ic2 n; n voltage values Vd2n and n current values Id2n are obtained in the discharging process; wherein n is a positive integer;
the charging process calculates a voltage variation value Δ Vcn from the voltage value Vc2n and the voltage value Vc2 at the time T2 according to the following equation (1):
ΔVcn＝Vc2n-Vc2……(1)
the current variation value Δ Icn is calculated from the current value Ic2n and the time T2 current value Ic2 according to the following formula (2):
ΔIcn＝Ic2n-Ic2……(2)
the discharge process calculates a voltage variation value Δ Vdn from the voltage value Vd2n and the voltage value Vd2 at the time T2 according to the following formula (3):
ΔVdn＝Vd2n-Vd2……(3)
the current change value Δ Idn is calculated from the current value Id2n and the current value Id2 at the time T2 according to the following formula (4):
ΔIdn＝Id2n-Id2……(4)
8. an apparatus for diagnosing a fault of a current sensor in a battery management system, the apparatus comprising a current sensor, a control module, a diagnostic module, and an alarm module, wherein:
the current sensor is used for detecting the current value of the high-voltage battery in real time;
the control module is used for receiving an instruction of the battery management system and switching different condition diagnosis strategies;
the diagnosis module is used for receiving a voltage value, SOC (system on chip), temperature and a current value of the current sensor which are sent by the battery management system and diagnosing whether the current sensor has faults or not;
the alarm module is used for reporting the information that the current sensor is in the fault state.
9. A terminal, comprising:
one or more processors;
a memory for storing the one or more processor-executable instructions;
wherein the one or more processors are configured to:
a method of performing a battery management system diagnosing a current sensor fault as claimed in any one of claims 1 to 7.
10. A non-transitory computer-readable storage medium, wherein instructions in the storage medium, when executed by a processor of a terminal, enable the terminal to perform a method of diagnosing current sensor faults in a battery management system as claimed in any one of claims 1 to 7.
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