CN113030759B - Method for detecting health degree of vehicle-mounted low-voltage storage battery - Google Patents
Method for detecting health degree of vehicle-mounted low-voltage storage battery Download PDFInfo
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- CN113030759B CN113030759B CN202110288023.7A CN202110288023A CN113030759B CN 113030759 B CN113030759 B CN 113030759B CN 202110288023 A CN202110288023 A CN 202110288023A CN 113030759 B CN113030759 B CN 113030759B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
Abstract
The invention discloses a method for detecting the health degree of a vehicle-mounted low-voltage storage battery, which relates to the technical field of automobiles, (1) setting an initial value for self-learning time T2 of a self-learning module according to the power consumption of a whole vehicle electrical appliance and the selection condition of the vehicle-mounted low-voltage storage battery during the design of a vehicle type; (2) The timer module obtains the voltage drop time T1 of the vehicle-mounted low-voltage storage battery; (3) The self-learning module updates the self-learning module by taking the voltage drop time T1 and the self-learning time T2 as comparison values of failure judgment, and evaluates the current health condition of the vehicle-mounted low-voltage storage battery. Therefore, the invention realizes failure fault detection and alarm of the vehicle-mounted low-voltage storage battery mainly according to detection, calculation and logic judgment of the vehicle controller, does not need to add or adjust other parts of the vehicle, has high adaptability, has a self-learning function, does not need to carry out previous data acquisition and analysis, and has small workload required by function realization.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a method for detecting the health degree of a vehicle-mounted low-voltage storage battery.
Background
At present, failure detection of the vehicle-mounted low-voltage storage battery is generally realized by a low-voltage storage battery setting state display device or a special low-voltage storage battery detection instrument. The method has the advantages that the current voltage value of the vehicle-mounted low-voltage storage battery is monitored in real time only in the field of vehicle control, when the current voltage value is lower than a preset alarm voltage value, the DC/DC converter is started to supplement the electric quantity of the vehicle-mounted low-voltage storage battery, and the health state of the vehicle-mounted low-voltage storage battery is rarely detected.
In the actual use process of the vehicle, the user cannot know the current health state of the vehicle-mounted low-voltage storage battery, and can only estimate the health state of the vehicle-mounted low-voltage storage battery according to the two aspects of whether normal use is affected or according to the used time, but hidden dangers that the vehicle cannot be started exist. Once the vehicle-mounted low-voltage storage battery is poor in health state, after the vehicle is stopped for a long time, the vehicle cannot be started, normal use of the vehicle is affected, and vehicle experience is reduced.
In one method for online real-time monitoring of the service life of a vehicle battery, the grant publication number CN108931742a indicates that the deviation degree from the standard voltage curve is judged to predict the health state of the vehicle-mounted low-voltage battery by comparing the voltage curve of the vehicle-mounted low-voltage battery acquired in real time with the voltage curve in the platform server. The service life reminding device of the automobile storage battery is indicated by the authorization notice number CN210191402U, the working time of the current vehicle-mounted low-voltage storage battery is calculated through the multimedia host, and the working time is compared with the upper limit of the preset working time of the vehicle-mounted low-voltage storage battery, so that the health state of the current vehicle-mounted low-voltage storage battery is predicted. Therefore, in the prior art, the state of health of the storage battery is predicted by adopting cloud platform voltage curve comparison or vehicle-mounted low-voltage storage battery using time comparison. However, in these prior art, the requirements on the on-vehicle low-voltage battery health status prediction device are high, and a large amount of data acquisition work is required in the early stage for actual comparison and prediction work, and meanwhile, misjudgment is caused due to different vehicle use conditions of users, so that functional experience is affected.
Disclosure of Invention
The invention provides a method for detecting the health degree of a vehicle-mounted low-voltage storage battery, which aims to solve the problems in the prior art.
The invention adopts the following technical scheme:
a method for detecting the health degree of a vehicle-mounted low-voltage storage battery comprises the following steps:
(1) The method comprises the steps that initial value is set to be initial time T20 according to vehicle type design time electric appliance power consumption of the vehicle and vehicle-mounted low-voltage storage battery selection conditions, namely self-learning time T2 of a self-learning module of a vehicle controller, wherein the initial time T20 is the time for voltage of the vehicle-mounted low-voltage storage battery to drop from initial voltage V1 to final voltage V2 in a power-down state of initial use;
(2) The method comprises the steps that a timer module of the whole vehicle controller obtains voltage drop time T1 of a vehicle-mounted low-voltage storage battery, wherein the voltage drop time T1 is the time for the voltage of the vehicle-mounted low-voltage storage battery to drop from a starting voltage V1 to a final voltage V2 in a current power-down state;
(3) And the whole vehicle controller updates the self-learning module by taking the voltage drop time T1 and the self-learning time T2 as comparison values of failure judgment, and evaluates the current health condition of the vehicle-mounted low-voltage storage battery.
Specifically, the vehicle controller collects the voltage and the current of the vehicle-mounted low-voltage storage battery through a voltage sampling circuit and a current sampling circuit respectively.
Specifically, the initial voltage V1 is a designed power-down stable voltage of the vehicle-mounted mortgage storage battery, and the final voltage V2 is a designed lower limit voltage of the vehicle-mounted mortgage storage battery; and when the current value of the vehicle-mounted low-voltage storage battery is in a power-down current interval, the current voltage is smaller than the initial voltage V1, and the key signal is always in an OFF state, the timing module starts to time the voltage drop time T1, and the timing is ended and the voltage drop time T1 is output until the current voltage of the vehicle-mounted low-voltage storage battery is smaller than the lower limit voltage.
Specifically, the whole vehicle controller continuously detects whether the key signal is in an OFF state, the timer module starts to count only when the whole vehicle is in a power-down state, synchronously detects the key signal in the counting process, immediately stops counting and outputs the currently recorded voltage drop time T1 to be invalid once the vehicle is in a non-whole vehicle power-down state and does not reach the lower limit voltage.
Specifically, when the voltage drop time T1 is less than or equal to the self-learning time T2, the self-learning module does not need to update the self-learning time T2 and the vehicle-mounted low-voltage storage battery capacity health capacity value; when the voltage drop time T1 is greater than the self-learning time T2, the self-learning module stores the value of the voltage drop time T1 to the self-learning time T2 so as to update the parameter value of the self-learning time T2 and update the capability health capability value of the vehicle-mounted low-voltage storage battery.
Specifically, the whole vehicle controller calculates a health coefficient K= (voltage drop time T1/self-learning time T2) of the vehicle-mounted low-voltage storage battery by comparing the relation between the voltage drop time T1 and the self-learning time T2, and the health degree SOH=K of the vehicle-mounted low-voltage storage battery is 100%; and when the health coefficient K is larger than the preset failure coefficient K1, sending the health degree SOH of the vehicle-mounted low-voltage storage battery to be normal to the instrument.
Specifically, when the health coefficient K is smaller than or equal to the set failure coefficient K1, the failure flag bit F starts to accumulate the continuous times, and when the failure flag bit F is greater than 3, a failure prompt is sent to the instrument panel.
As can be seen from the above description of the structure of the present invention, compared with the prior art, the present invention has the following advantages:
the invention realizes failure fault detection and alarm of the vehicle-mounted low-voltage storage battery mainly according to detection, calculation and logic judgment of the vehicle controller, does not need to add or adjust other parts of the vehicle, has high adaptability, has a self-learning function, does not need to carry out previous data acquisition and analysis, and has small workload required by function realization.
Drawings
Fig. 1 is a schematic diagram of the present invention.
FIG. 2 is a flow chart of the timing module according to the present invention.
FIG. 3 is a flow chart of the self-learning module according to the present invention.
Detailed Description
Specific embodiments of the present invention will be described below with reference to the accompanying drawings.
As shown in fig. 1 to 3, the method for detecting the health degree of the vehicle-mounted low-voltage storage battery mainly realizes failure fault detection and alarm of the vehicle-mounted low-voltage storage battery according to detection, calculation and logic judgment of a vehicle controller (VCU, vehicle Control System), and the whole process does not involve other working parts of the vehicle except the low-voltage storage battery and an instrument.
As shown in fig. 1 to 3, the method for detecting the health degree of the vehicle-mounted low-voltage storage battery mainly comprises the following steps:
(1) The vehicle controller comprises a self-learning module, wherein an initial value is set as an initial time T20 for self-learning time T2 of the self-learning module according to vehicle type design power consumption of the vehicle electrical appliance and the use condition of the vehicle-mounted low-voltage storage battery, and the initial time T20 is the time for reducing the voltage of the vehicle-mounted low-voltage storage battery from an initial voltage V1 to a final voltage V2 when the voltage of the vehicle-mounted low-voltage storage battery is in a power-down state of initial use.
As shown in fig. 1 to 3, the vehicle controller collects the voltage and the current of the vehicle-mounted low-voltage storage battery through the original voltage sampling circuit and the original current sampling circuit of the vehicle respectively. Preferably, the initial voltage V1 is a designed power-down stable voltage of the vehicle-mounted mortgage battery, and the final voltage V2 is a designed lower limit voltage of the vehicle-mounted mortgage battery.
(2) The timer module of the vehicle controller obtains the voltage drop time T1 of the vehicle-mounted low-voltage storage battery, wherein the voltage drop time T1 is the time for the voltage of the vehicle-mounted low-voltage storage battery to drop from the initial voltage V1 to the final voltage V2 in the current power-down state.
As shown in fig. 1 to 3, specifically, the timer module counts the voltage drop time T1 as follows: when the current value of the vehicle-mounted low-voltage storage battery is in a power-down current interval (namely, the minimum design current < the current value < the maximum design current), the current voltage is smaller than the initial voltage V1, and the key signal is always in an OFF state, the timing module starts to count the voltage drop time T1 until the timing is finished and the voltage drop time T1 is output when the current voltage of the vehicle-mounted low-voltage storage battery is smaller than the lower limit voltage.
As shown in fig. 1 to 3, more specifically, the whole vehicle controller continuously detects whether the key signal is in the OFF state, and the timer module starts to count only when the whole vehicle is in the power-down state. And the key signal is synchronously detected in the timing process, once the vehicle is switched into the off-vehicle power-down state and the lower limit voltage is not reached, the timing is immediately stopped, the currently recorded voltage drop time T1 is output to be invalid, the output voltage drop time T1 is ensured to be the voltage drop time of the off-vehicle power-down state, and the data reliability is improved.
After the key signal is continuously in the OFF state, the whole vehicle controller judges the current of the vehicle-mounted low-voltage storage battery in the power-down state, and can enter the next judging process only when the current value is between the maximum design current and the minimum design current, so that the current vehicle-mounted low-voltage storage battery is ensured to be in the design power-down state, and the influence of the condition that the voltage drop of the vehicle-mounted low-voltage storage battery is too fast or too slow due to the short circuit/circuit of an external electric appliance or a circuit of the whole vehicle is avoided.
(3) And the whole vehicle controller updates the self-learning module by taking the voltage drop time T1 and the self-learning time T2 as comparison values of failure judgment, and evaluates the current health condition of the vehicle-mounted low-voltage storage battery.
As shown in fig. 1 to 3, specifically, the logic inside the self-learning module is mainly:
(a) When the voltage drop time T1 is smaller than or equal to the self-learning time T2, the vehicle-mounted low-voltage storage battery capacity health capacity value is maximum, and the self-learning module does not need to learn to update, namely, does not need to update the self-learning time T2 and the vehicle-mounted low-voltage storage battery capacity health capacity value. In general, the initial time T20 of the self-learning time T2 is set to be smaller, and the self-learning time T is updated to be a learning value and stored in the vehicle controller.
(b) When the voltage drop time T1 is greater than the self-learning time T2, the self-learning module stores the value of the voltage drop time T1 to the self-learning time T2 so as to update the parameter value of the self-learning time T2 and update the capability health capability value of the vehicle-mounted low-voltage storage battery.
As shown in fig. 1 to 3, the whole vehicle controller calculates a health coefficient K and a health degree SOH of the vehicle-mounted low-voltage storage battery by comparing a relationship between a voltage drop time T1 and a self-learning time T2 output by the timing module, and presets a failure coefficient K1 and a failure flag bit F. The detection strategy is specifically as follows:
health coefficient K= (voltage drop time T1/self-learning time T2), the value of K is between 0 and 1, and the larger the value of K is, the better the health state is; health soh=k×100%.
When the health coefficient K is larger than the set failure coefficient K1, the current vehicle-mounted low-voltage storage battery still can keep normal working capacity, the health state is good, the failure risk is low, and the vehicle-mounted low-voltage storage battery health degree SOH is sent to the instrument normally.
When the health coefficient K is smaller than or equal to the set failure coefficient K1, the failure zone bit F starts to accumulate continuous times, and when the failure zone bit F is larger than 3, the vehicle-mounted low-voltage storage battery is indicated to face higher failure risk currently, a failure prompt is sent to an instrument panel, and a driver is prompted to detect and replace the vehicle-mounted low-voltage storage battery.
In summary, the invention provides a vehicle-mounted low-voltage storage battery health degree detection and failure alarm method, which has a false alarm prevention function. The vehicle control unit can realize failure judgment only by the vehicle control unit, does not need to add or adjust other parts of the vehicle, has high adaptability, has a self-learning function, does not need to perform previous data acquisition and analysis, and has small workload required by function realization.
The foregoing is merely illustrative of specific embodiments of the present invention, but the design concept of the present invention is not limited thereto, and any insubstantial modification of the present invention by using the design concept shall fall within the scope of the present invention.
Claims (5)
1. A method for detecting the health degree of a vehicle-mounted low-voltage storage battery is characterized by comprising the following steps of: the method comprises the following steps:
(1) The method comprises the steps that initial value is set to be initial time T20 according to vehicle type design time electric appliance power consumption of the vehicle and vehicle-mounted low-voltage storage battery selection conditions, namely self-learning time T2 of a self-learning module of a vehicle controller, wherein the initial time T20 is the time for voltage of the vehicle-mounted low-voltage storage battery to drop from initial voltage V1 to final voltage V2 in a power-down state of initial use; the starting voltage V1 is the designed power-down stable voltage of the vehicle-mounted low-voltage storage battery, and the ending voltage V2 is the designed lower limit voltage of the vehicle-mounted low-voltage storage battery; the current value of the vehicle-mounted low-voltage storage battery is in a power-down current interval, the current voltage is smaller than the initial voltage V1, and the key signal is always in an OFF state, the timing module starts timing of the voltage drop time T1 until the timing is finished and the voltage drop time T1 is output when the current voltage of the vehicle-mounted low-voltage storage battery is smaller than the lower limit voltage;
(2) The method comprises the steps that a timer module of the whole vehicle controller obtains voltage drop time T1 of a vehicle-mounted low-voltage storage battery, wherein the voltage drop time T1 is the time for the voltage of the vehicle-mounted low-voltage storage battery to drop from a starting voltage V1 to a final voltage V2 in a current power-down state;
(3) The vehicle controller takes the voltage drop time T1 and the self-learning time T2 as comparison values of failure judgment, updates the self-learning module and evaluates the current health condition of the vehicle-mounted low-voltage storage battery; the whole vehicle controller calculates the health coefficient K=voltage drop time T1/self-learning time T2 of the vehicle-mounted low-voltage storage battery by comparing the relation between the voltage drop time T1 and the self-learning time T2, and the health degree SOH=K of the vehicle-mounted low-voltage storage battery is 100%; and when the health coefficient K is larger than the preset failure coefficient K1, sending the health degree SOH of the vehicle-mounted low-voltage storage battery to be normal to the instrument.
2. The method for detecting the health degree of the vehicle-mounted low-voltage storage battery according to claim 1, wherein the method comprises the following steps of: the vehicle controller respectively collects the voltage and the current of the vehicle-mounted low-voltage storage battery through the voltage sampling circuit and the current sampling circuit.
3. The method for detecting the health degree of the vehicle-mounted low-voltage storage battery according to claim 1, wherein the method comprises the following steps of: the whole vehicle controller continuously detects whether the key signal is in an OFF state or not, the timer module starts to count time only when the whole vehicle is in a power-down state, and synchronously detects the key signal in the counting process, and immediately stops counting time and outputs the current recorded voltage drop time T1 to be invalid once the vehicle is in a non-whole vehicle power-down state and does not reach the lower limit voltage.
4. The method for detecting the health degree of the vehicle-mounted low-voltage storage battery according to claim 1, wherein the method comprises the following steps of: when the voltage drop time T1 is smaller than or equal to the self-learning time T2, the self-learning module does not need to update the self-learning time T2 and the vehicle-mounted low-voltage storage battery capacity health capacity value; when the voltage drop time T1 is greater than the self-learning time T2, the self-learning module stores the value of the voltage drop time T1 to the self-learning time T2 so as to update the parameter value of the self-learning time T2 and update the capability health capability value of the vehicle-mounted low-voltage storage battery.
5. The method for detecting the health degree of the vehicle-mounted low-voltage storage battery according to claim 1, wherein the method comprises the following steps of: when the health coefficient K is smaller than or equal to the set failure coefficient K1, the failure zone bit F starts to accumulate continuous times, and when the failure zone bit F is larger than 3, a failure prompt is sent to the instrument panel.
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| CN114295997A (en) * | 2021-12-20 | 2022-04-08 | 江苏纵帆微电子有限公司 | Method for monitoring health state of low-voltage storage battery of automobile by using TBOX |
| CN114660474A (en) * | 2022-05-23 | 2022-06-24 | 深圳市驰普科达科技有限公司 | Storage battery fault diagnosis method and device, electronic equipment and storage medium |
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| US9581654B2 (en) * | 2013-02-12 | 2017-02-28 | Johnson Controls Technology Company | Vehicle battery monitoring system |
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