CN111610453A - Storage battery under-voltage prediction method - Google Patents
Storage battery under-voltage prediction method Download PDFInfo
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- CN111610453A CN111610453A CN201910155429.0A CN201910155429A CN111610453A CN 111610453 A CN111610453 A CN 111610453A CN 201910155429 A CN201910155429 A CN 201910155429A CN 111610453 A CN111610453 A CN 111610453A
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Abstract
The invention provides a storage battery under-voltage prediction method, which can predict the under-voltage state of a storage battery in advance by counting the total number of records of voltage abnormality of the storage battery and the number of records of voltage of the storage battery, which is less than the set voltage threshold value of a stop operation state, calculating a first record ratio according to the total number of records and the number of records, and judging that the storage battery is under-voltage when the first record ratio is less than or equal to the set first ratio threshold value.
Description
Technical Field
The invention belongs to the technical field of automobile intelligent maintenance, and particularly relates to a storage battery under-voltage prediction method.
Background
The existing storage battery under-voltage detection method is to judge according to the detected battery voltage and output an under-voltage signal when the under-voltage condition is met. However, the existing storage battery undervoltage method outputs an undervoltage signal when the voltage of the storage battery is low, the undervoltage state of the storage battery cannot be predicted in advance, undervoltage reminding cannot be performed before the situation that the voltage of the storage battery is low occurs, the situation that the vehicle cannot be used due to the fact that the voltage of the storage battery of the vehicle is low when the vehicle needs to be used may occur, and the use reliability of the vehicle is reduced.
Disclosure of Invention
The invention aims to provide a storage battery under-voltage prediction method, which is used for solving the problem that the storage battery under-voltage state cannot be predicted in advance by the storage battery under-voltage prediction method in the prior art, so that the use reliability of a vehicle is low.
In order to achieve the aim, the invention provides a storage battery under-voltage prediction method, which comprises a historical data acquisition process and an under-voltage judgment process;
the historical data acquisition process comprises the following steps:
detecting the state of the vehicle and the voltage of the storage battery according to a corresponding sampling period within a certain time period, and performing abnormal judgment on the voltage of the storage battery, wherein the abnormal judgment comprises a first judgment condition and a second judgment condition, and the first judgment condition comprises at least one of the following two modes: when the vehicle is turned off and the voltage of the storage battery is smaller than the set voltage threshold value in the stop operation state, judging that the voltage of the storage battery is abnormal, and outputting a record; when the vehicle is turned off, the voltage of the storage battery is greater than or equal to the voltage threshold value in the running stop state, and the stopping time of the vehicle is greater than a first set time and less than a second set time, judging that the voltage of the storage battery is abnormal, and outputting a record; the second determination condition includes at least one of the following two ways: when the vehicle is turned ON and the voltage of the storage battery is smaller than a set running state voltage threshold value, judging that the voltage of the storage battery is abnormal, and outputting a record; when the vehicle is turned off and the vehicle is stopped for a time greater than or equal to the second set time, judging that the voltage of the storage battery is abnormal, and outputting a record;
the undervoltage judgment process comprises the following steps:
counting the total number of records in the certain time period and the number of records corresponding to the condition that the voltage of the storage battery is smaller than the voltage threshold value in the stop operation state, and calculating the ratio of the number of records to the total number of records to obtain a first record ratio of the voltage of the storage battery corresponding to the certain time period to be smaller than the voltage threshold value in the stop operation state;
and when the first recording ratio is greater than or equal to a set first ratio threshold value, determining that the storage battery is under-voltage.
The invention has the beneficial effects that: the method can predict the undervoltage state of the storage battery voltage in advance, inform a vehicle owner or a vehicle maintenance worker to maintain the storage battery when the storage battery voltage is predicted to be lower, and do not need to know the low state of the storage battery voltage until the storage battery voltage is very low, so that the vehicle cannot be started due to storage battery feed, the normal operation of the vehicle is ensured, and the use reliability of the vehicle is improved.
In order to improve the accuracy of the undervoltage prediction result of the storage battery, in the undervoltage judgment process, when the first recorded ratio is smaller than the first ratio threshold and is greater than or equal to a set second ratio threshold, the recorded ratio corresponding to a previous time period of the certain time period is obtained to obtain a second recorded ratio, judgment is performed according to the second recorded ratio, and when the difference value between the first recorded ratio and the second recorded ratio is greater than a set error threshold, the first recorded ratio is larger than the second recorded ratio, that is, the situation that the voltage of the storage battery is abnormal is more and more serious, and at this time, the undervoltage of the storage battery is judged.
In order to improve the accuracy of the undervoltage prediction result of the storage battery, when the first record ratio is smaller than the first ratio threshold and is greater than or equal to a set second ratio threshold, and when the difference between the first record ratio and the second record ratio is greater than a set error threshold, the record ratio corresponding to the previous time period of the previous time period is further acquired to obtain a third record ratio, the judgment is performed according to the third record ratio, and when the second record ratio is greater than the third record ratio, the second record ratio is larger than the third record ratio, that is, the case that the voltage of the storage battery is abnormal is more and more serious, and the undervoltage of the storage battery is determined at this time.
In order to improve the accuracy of the prediction result, prevent inaccurate prediction caused by too small number of samples and ensure the effectiveness of the subsequent storage battery under-voltage judgment process according to the recorded proportion, the under-voltage judgment process further comprises the following steps: and comparing the record number of the voltage of the storage battery smaller than the voltage threshold value in the stop operation state with the set total number threshold value, and when the record number of the voltage of the storage battery smaller than the voltage threshold value in the stop operation state is larger than the set total number threshold value, performing the subsequent process of undervoltage judgment according to the record ratio.
In order to improve the accuracy of the prediction result of the undervoltage of the storage battery, when the first record ratio is greater than or equal to the set first ratio threshold, the standard deviation of the storage battery voltage obtained by corresponding detection of each record is also calculated, and when the standard deviation is greater than or equal to the set standard deviation threshold, the undervoltage of the storage battery is judged.
In order to improve the use reliability of the vehicle when the voltage of the storage battery is abnormal, in the historical data acquisition process, when the vehicle is ON and the voltage of the storage battery is smaller than a set running state voltage threshold, a fault detection instruction of the vehicle-mounted DC/DC module is output; when the vehicle is turned off and the voltage of the storage battery is smaller than the set voltage threshold value in the stop running state, a vehicle starting charging instruction is output; when the vehicle is turned off, the voltage of the storage battery is greater than or equal to the voltage threshold value in the running stop state, and the stopping time of the vehicle is greater than a first set time and less than a second set time, a command of turning off the power supply of the whole vehicle is output; and when the vehicle is turned off and the vehicle is stopped for a time greater than or equal to the second set time, outputting a long-time stop charging reminding instruction. Corresponding solving instructions are output according to various abnormal conditions, and the condition that the storage battery is under-voltage can be delayed.
Drawings
FIG. 1 is a schematic diagram illustrating the determination of abnormal voltage of a storage battery according to the present invention;
fig. 2 is a flow chart of battery under-voltage prediction according to the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings:
the invention provides a storage battery under-voltage prediction method, which mainly aims at a storage battery of a pure electric vehicle. The method comprises a historical data acquisition process and an undervoltage judgment process; in the historical data acquisition process, the state of the vehicle and the voltage of the storage battery are detected according to corresponding sampling periods within a certain time period, and abnormal judgment of the voltage of the storage battery is performed. The voltage of the storage battery is sampled every 30 minutes from the first time point of the day, and when the voltage of the storage battery is judged to be abnormal, a record is output. In the undervoltage judgment process, counting the total number of records in a day and the number of records corresponding to the condition that the voltage of the storage battery is smaller than the voltage threshold value in the operation stop state, calculating the ratio of the number of records to the total number of records, obtaining a first record ratio of the voltage of the storage battery corresponding to the day and smaller than the voltage threshold value in the operation stop state, and judging that the storage battery is undervoltage when the first record ratio is larger than or equal to the set first ratio threshold value.
The above-described battery voltage abnormality determination includes a first determination condition including at least one of the following determination modes 2) and 3) and a second determination condition including at least one of the following determination modes 1) and 4). Specifically, as shown in fig. 1, the various determination methods for determining the battery voltage abnormality are obtained through the following processes:
1) the vehicle ON fires, detects the battery voltage through remote monitering system, when detecting that the battery voltage is less than the running state voltage threshold of setting, the running state voltage threshold of this embodiment is 26V, as other implementation manners, can also set to other numerical values, when detecting that the battery voltage is less than 26V, judge that the battery voltage is unusual, in order to increase the unusual accuracy of battery voltage, if the battery voltage is less than 26V and lasts for more than 1 minute time, the platform outputs a record, and reports to the police. The record is maintained until the platform no longer outputs a record and stops the alarm when the battery voltage is greater than or equal to 26V for a period of 5 minutes. If the voltage of the storage battery is less than 26V, the vehicle-mounted DC/DC module for charging the battery is in failure in the running state of the vehicle, so that the vehicle-mounted DC/DC module failure detection instruction is output while the platform outputs the record. In the process, the time that the battery voltage is continuously greater than 26V and the time that the battery voltage is continuously less than 26V can be adaptively set as other time.
2) The vehicle ON fire is closed, the voltage of the storage battery is detected through the remote monitoring system, when the voltage of the storage battery is detected to be smaller than the set voltage threshold value in the running stopping state, the voltage threshold value in the running stopping state is 24V, namely when the voltage of the storage battery is smaller than 24V, the voltage of the storage battery is judged to be abnormal, if the voltage of the storage battery is smaller than 24V and lasts for longer than 1 minute, a record is output by the platform, and an alarm is given. The record is maintained until the platform no longer outputs a record and stops the alarm when the battery voltage is greater than or equal to 24V for a period of 5 minutes. And if the voltage of the storage battery is less than 24V, indicating that the electric quantity of the storage battery is low, outputting a command for starting charging of the vehicle. In this process, the time during which the battery voltage concerned continues to be greater than 24V and the time during which the battery voltage continues to be less than 24V can be set adaptively to other times.
3) The method comprises the steps that a vehicle ON fire switch detects the voltage of a storage battery through a remote monitoring system, when the detected voltage of the storage battery is larger than or equal to the voltage threshold value of the running stop state and the parking time of the vehicle is larger than a first set time and smaller than a second set time, namely the voltage of the storage battery is larger than or equal to 24V and the parking time of the vehicle is larger than 1.5h and smaller than 15 days, the voltage of the storage battery is judged to be abnormal, a record is output by a platform, and an alarm is given; the record is maintained until the platform no longer outputs a record and stops the alarm when the battery voltage is less than 24V for a period of 5 minutes or the time the vehicle is parked does not meet for more than 1.5h and less than 15 days. In order to protect the safety of the vehicle, if the parking time of the vehicle is more than 1.5h and less than 15 days, a command of turning off the power supply of the whole vehicle is output. In the process, the first set time is 1.5h, the second set time is 15 days, and the duration time is 5 minutes.
4) And if the vehicle is turned ON and turned off, judging that the voltage of the storage battery is abnormal if the parking time of the vehicle is detected to be greater than or equal to a second set time, namely the parking time of the vehicle is greater than or equal to 15 days, outputting a record by the platform, and alarming. And a warning instruction that the vehicle needs to be charged when being stopped for a long time is also output at the moment.
In order to improve the accuracy of the storage battery under-voltage prediction method, the four abnormality determination manners are performed in this embodiment, and if the accuracy requirement on the storage battery under-voltage prediction method is not so high, when the storage battery voltage abnormality is detected, only one of the determination manner 2) and the determination manner 3) and one of the determination manner 1) and the determination manner 4) may be performed.
As shown in fig. 2, the method for predicting the undervoltage of the storage battery according to the abnormal recording condition of the storage battery voltage comprises the following steps:
1. counting the Total number of records N _ Total within one day and the number of records N corresponding to the condition that the voltage of the storage battery is less than the voltage threshold value in the stop operation state, and calculating the ratio of the number of records to the Total number of records to obtain a first record ratio X of the voltage of the storage battery less than the voltage threshold value (24V) in the stop operation state within one dayt0(ii) a Wherein the first record ratio Xt0＝N/N_Total。
2. Comparing the relationship between the number of records that the voltage of the storage battery is less than the voltage threshold value in the running stop state and the set total number threshold value, wherein the total number threshold value of the embodiment is 50, when the number of records that the voltage of the storage battery is less than the voltage threshold value in the running stop state is more than 50, performing the subsequent undervoltage judgment process according to the recording ratio, and when the number of records that the voltage of the storage battery is less than the voltage threshold value in the running stop state is less than 50, stopping the undervoltage judgment process.
3. When the first record occupancy is greater than or equal to the set first occupancy threshold, the first occupancy threshold of the embodiment is 45%, the standard deviation of the battery voltage detected corresponding to each record is calculated, and when the standard deviation of the battery voltage is greater than or equal to the set standard deviation threshold, the standard deviation threshold of the embodiment is 1.5, the battery is judged to be under-voltage, and an alarm is given. And when the standard deviation of the voltage of the storage battery is smaller than the set standard deviation threshold value, stopping the storage battery under-voltage judgment process. Wherein, the calculation process of the standard deviation is as follows: from the first time point of the day, calculating the standard deviation of the accumulated voltage of the day, namely the standard deviation of the voltage of the storage battery, every 30 minutes, wherein the specific expression is as follows:
wherein Y is the standard deviation of the battery voltage, xiThe i-th battery voltage value is represented by μ, which is an average value of the battery voltages.
4. When the first record ratio is smaller than the first ratio threshold and is greater than or equal to the set second ratio threshold, the second ratio threshold of the embodiment is 20%, the record ratio corresponding to the previous time period in the day is immediately obtained, that is, the record ratio of the previous day is calculated to obtain the second record ratio Xt0-1And comparing the difference value of the first record ratio and the second record ratio with the set error threshold value. And when the first recording ratio is less than 20%, stopping the storage battery under-voltage judgment process.
5. When the difference between the first record ratio and the second record ratio is greater than the set error threshold, the error threshold of this embodiment is 5%, and the record ratio corresponding to the previous time period of the previous time period is also obtained, that is, the record ratios of the previous two days are calculated to obtain a third record ratio Xt0-2And judging according to the third recording ratio, and judging that the storage battery is under-voltage and giving an alarm when the second recording ratio is larger than the third recording ratio.
In the storage battery under-voltage judgment process, when the first recorded occupancy is judged to be greater than the set first occupancy threshold, the storage battery under-voltage can be judged, and in order to improve the accuracy of storage battery under-voltage judgment, the processes of the step 2 and the step 3 are performed; when the first record ratio is less than 45% of the first ratio threshold and is greater than or equal to 20% of the set second ratio threshold, obtaining the record ratio corresponding to the previous time period of a certain time period to obtain the second record ratio, judging according to the second record ratio, and when the difference value between the first record ratio and the second record ratio is greater than 5% of the set error threshold, judging that the storage battery is under-voltage, and in order to improve the accuracy of judgment of the storage battery under-voltage, then performing the process of step 5.
The specific embodiments are given above, but the present invention is not limited to the above-described embodiments. The basic idea of the present invention lies in the above basic scheme, and it is obvious to those skilled in the art that no creative effort is needed to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (6)
1. A storage battery under-voltage prediction method is characterized by comprising a historical data acquisition process and an under-voltage judgment process;
the historical data acquisition process comprises the following steps:
detecting the state of the vehicle and the voltage of the storage battery according to a corresponding sampling period within a certain time period, and performing abnormal judgment on the voltage of the storage battery, wherein the abnormal judgment comprises a first judgment condition and a second judgment condition, and the first judgment condition comprises at least one of the following two modes: when the vehicle is turned off and the voltage of the storage battery is smaller than the set voltage threshold value in the stop operation state, judging that the voltage of the storage battery is abnormal, and outputting a record; when the vehicle is turned off, the voltage of the storage battery is greater than or equal to the voltage threshold value in the running stop state, and the stopping time of the vehicle is greater than a first set time and less than a second set time, judging that the voltage of the storage battery is abnormal, and outputting a record; the second determination condition includes at least one of the following two ways: when the vehicle is turned ON and the voltage of the storage battery is smaller than a set running state voltage threshold value, judging that the voltage of the storage battery is abnormal, and outputting a record; when the vehicle is turned off and the vehicle is stopped for a time greater than or equal to the second set time, judging that the voltage of the storage battery is abnormal, and outputting a record;
the undervoltage judgment process comprises the following steps:
counting the total number of records in the certain time period and the number of records corresponding to the condition that the voltage of the storage battery is smaller than the voltage threshold value in the stop operation state, and calculating the ratio of the number of records to the total number of records to obtain a first record ratio of the voltage of the storage battery corresponding to the certain time period to be smaller than the voltage threshold value in the stop operation state;
and when the first recording ratio is greater than or equal to a set first ratio threshold value, determining that the storage battery is under-voltage.
2. The method for predicting the undervoltage of the storage battery according to claim 1, wherein in the undervoltage judgment process, when the first recorded ratio is smaller than the first ratio threshold and is greater than or equal to a set second ratio threshold, a recorded ratio corresponding to a previous time period of the certain time period is obtained to obtain a second recorded ratio, the judgment is performed according to the second recorded ratio, and when a difference value between the first recorded ratio and the second recorded ratio is greater than a set error threshold, the undervoltage of the storage battery is judged.
3. The method for predicting the undervoltage of the storage battery according to claim 2, wherein when the first recorded ratio is smaller than the first ratio threshold and is greater than or equal to a set second ratio threshold, and when a difference between the first recorded ratio and the second recorded ratio is greater than a set error threshold, a recorded ratio corresponding to a previous time period of the previous time period is further obtained to obtain a third recorded ratio, the judgment is performed according to the third recorded ratio, and when the second recorded ratio is greater than the third recorded ratio, the undervoltage of the storage battery is determined.
4. The battery under-voltage prediction method according to claim 1, wherein the under-voltage determination process further comprises the steps of: and comparing the record number of the voltage of the storage battery smaller than the voltage threshold value in the stop operation state with the set total number threshold value, and when the record number of the voltage of the storage battery smaller than the voltage threshold value in the stop operation state is larger than the set total number threshold value, performing the subsequent process of undervoltage judgment according to the record ratio.
5. The battery under-voltage prediction method according to claim 4, wherein when the first record occupancy is greater than or equal to a set first occupancy threshold, a standard deviation of the battery voltage detected corresponding to each record is further calculated, and when the standard deviation is greater than or equal to a set standard deviation threshold, the battery under-voltage is determined.
6. The battery under-voltage prediction method according to claim 1, characterized in that in the historical data acquisition process, when the vehicle is ON and the battery voltage is less than the set running state voltage threshold, a vehicle-mounted DC/DC module fault detection instruction is also output; when the vehicle is turned off and the voltage of the storage battery is smaller than the set voltage threshold value in the stop running state, a vehicle starting charging instruction is output; when the vehicle is turned off, the voltage of the storage battery is greater than or equal to the voltage threshold value in the running stop state, and the stopping time of the vehicle is greater than a first set time and less than a second set time, a command of turning off the power supply of the whole vehicle is output; and when the vehicle is turned off and the vehicle is stopped for a time greater than or equal to the second set time, outputting a long-time stop charging reminding instruction.
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