Vehicle low-voltage storage battery monitoring method and device, vehicle and computer program product

Abstract

The invention provides a vehicle low-voltage storage battery monitoring method and device and a computer program product, and the method comprises the steps: obtaining a current starting current reference curve which is a maximum electricity consumption current curve of a starting current curve of a storage battery in the last n vehicle starting success processes; n is a preset value; the current voltage of the storage battery is obtained, whether the current discharge capacity of the storage battery meets the current starting current reference curve or not is determined according to the current voltage of the storage battery, and if not, an alarm is given; according to the invention, the technical problem of false alarm caused by unreasonable setting of the starting electric quantity threshold value or inaccurate actual electric quantity monitored by the storage battery sensor can be solved.

Description

Technical Field

[0001] The present invention relates to the technical field of low-voltage power management for vehicles, and particularly to a method and device for monitoring a low-voltage battery of a vehicle, a vehicle, and a computer program product. Background Art

[0002] The low-battery reminder function of a vehicle refers to that a battery sensor monitors the actual state of charge (SOC) of the vehicle's low-voltage battery in real time. The vehicle system compares the monitored actual state of charge with a preset starting state of charge threshold. When the actual state of charge is lower than the starting state of charge threshold, a low-battery alarm is issued. However, this alarm method may result in false alarms due to unreasonable setting of the starting state of charge threshold (usually with too large a margin) or inaccurate actual state of charge monitored by the battery sensor. Summary of the Invention

[0003] The purpose of the present invention is to provide a method and device for monitoring a low-voltage battery of a vehicle, a vehicle, and a computer program product, so as to solve the technical problem of false alarms caused by unreasonable setting of the starting state of charge threshold or inaccurate actual state of charge monitored by the battery sensor.

[0004] To achieve the above purpose, according to the first aspect of the present invention, a method for monitoring a low-voltage battery of a vehicle is provided. The method includes:

[0005] Obtaining a current starting current reference curve, where the current starting current reference curve is the maximum power consumption current curve of the starting current curves of the battery during the successful starting of the vehicle in the most recent n times; n is a preset value;

[0006] Obtaining the current voltage of the battery, and determining whether the current discharge capacity of the battery meets the current starting current reference curve according to the current voltage of the battery. If not, an alarm is issued.

[0007] According to the second aspect of the present invention, a device for monitoring a low-voltage battery of a vehicle is provided, including:

[0008] A reference curve acquisition module for obtaining a current starting current reference curve, where the current starting current reference curve is the maximum power consumption current curve of the starting current curves of the battery during the successful starting of the vehicle in the most recent n times; n is a preset value;

[0009] A first battery warning module for obtaining the current voltage of the battery, and determining whether the current discharge capacity of the battery meets the current starting current reference curve according to the current voltage of the battery. If not, an alarm is issued.

[0010] According to the third aspect of the present invention, a device for monitoring a low-voltage battery of a vehicle is provided, including:

[0011] A communication interface for communicating with other electronic devices;

[0012] A memory for storing computer program instructions;

[0013] A processor for executing the computer program instructions to support the device in implementing the method described in the first aspect.

[0014] According to the fourth aspect of the present invention, there is provided a vehicle including the vehicle low-voltage battery monitoring device described in the second aspect.

[0015] According to the fifth aspect of the present invention, there is provided a computer program product including computer program instructions that direct a computer device to perform operations corresponding to the method described in the first aspect.

[0016] A vehicle low-voltage battery monitoring method, device, vehicle, and computer program product proposed by the present invention have the following beneficial effects:

[0017] Based on the current starting current reference curve, by real-time monitoring the relationship between the discharge capacity of the battery and the actual starting current demand, it is possible to more accurately determine whether the battery has sufficient power to start the vehicle, thereby reducing false alarms; at the same time, using the maximum power consumption current curve during the successful starting of the vehicle in the most recent n times as a reference to dynamically update the starting current reference curve makes the setting of the alarm condition more reasonable, adapts to changes in different vehicles and driving conditions, and can effectively solve the problem of false alarms caused by unreasonable setting of the starting power threshold or inaccurate monitoring of the battery sensor in the prior art, improving the accuracy and reliability of vehicle low-voltage battery monitoring. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required in the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0019] Figure 1 It is a flowchart of a vehicle low-voltage battery monitoring method in an embodiment of the present invention.

[0020] Figure 2 It is an equivalent schematic diagram of the discharge capacity of the low-voltage battery in an embodiment of the present invention.

[0021] Figure 3 It is a structural framework diagram of a vehicle low-voltage battery monitoring device in an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The detailed description of the drawings is intended as an illustration of the current embodiments of the present invention, rather than representing the only form in which the present invention can be implemented. It should be understood that the same or equivalent functions can be accomplished by different embodiments intended to be included within the spirit and scope of the present invention.

[0023] Referring to Figure 1 , an embodiment of the present invention provides a method for monitoring a vehicle low-voltage battery, the method comprising the following steps:

[0024] Step S10, obtaining a current starting current reference curve, where the current starting current reference curve is the maximum power consumption current curve of the starting current curves of the battery during the successful starting of the vehicle in the most recent n times; n is a preset value.

[0025] Specifically, for example, the starting current curve refers to the curve of the change of current with time during the starting process of a device (such as a motor, an automobile engine, etc.). The starting current curve describes the change of current during the process of the device from a stationary state to a normal operating state. For example, the starting current curve of a motor reflects the change of current with time from when the power is turned on to when the rated speed is reached, and the starting current curve of an automobile represents the change of the output current of the battery with time when the automobile starts. The current starting current reference curve in this embodiment refers to the most recently updated starting current reference curve, and the starting current reference curve is a standard or benchmark for comparing the discharge capacity of the battery and the current required to start the vehicle.

[0026] By reviewing and analyzing the starting current curves of the battery during the successful starting of the vehicle in the most recent n times, these curves record the actual discharge conditions of the battery during each start. The maximum power consumption current curve is selected from them, that is, the current curve of the start with the largest discharge current. This maximum power consumption current curve will be used to update the current starting current reference curve. The preset value n can be adjusted according to the actual situation to balance the response speed of the system and the accuracy of the reference data. In this way, the starting current reference curve can dynamically adapt to the actual usage conditions of the vehicle, thereby improving the accuracy and reliability of the monitoring.

[0027] Step S20, obtaining the current voltage of the battery, and determining whether the current discharge capacity of the battery meets the current starting current reference curve according to the current voltage of the battery. If it does not meet, an alarm is given.

[0028] Specifically, the current voltage of the storage battery is monitored in real time. The voltage of the storage battery is an important indicator to measure its discharge capacity. According to the current voltage of the storage battery, the current discharge capacity of the storage battery can be determined. Based on the current starting current reference curve obtained in step S10, it is judged whether the current discharge capacity of the storage battery is sufficient to meet the requirement of starting the vehicle. If the discharge capacity of the storage battery is insufficient to meet the requirement of the starting current reference curve, an alarm will be triggered to notify the driver that the battery power may be insufficient and the battery needs to be charged or replaced. Specifically, for example, a buzzer is installed inside the vehicle to emit a loud warning sound; for another example, a warning light on the instrument panel lights up, which can be an icon indicating the battery power; for another example, a warning message is displayed on the vehicle's display screen or a dialog box pops up; for another example, a notification or warning is sent through the mobile application connected to the vehicle; for another example, the vehicle's built-in voice system broadcasts a warning message, such as "The battery power is low. Please charge it as soon as possible."

[0029] In summary, the method of this embodiment is based on the current starting current reference curve. By monitoring the relationship between the discharge capacity of the storage battery and the actual starting current demand in real time, it can more accurately judge whether the storage battery has sufficient power to start the vehicle, thereby reducing false alarms. At the same time, the maximum power consumption current curve during the successful starting of the vehicle in the recent n times is used as a reference to dynamically update the starting current reference curve, making the setting of the alarm condition more reasonable and adapting to the changes of different vehicles and driving conditions. It can effectively solve the problem of false alarms caused by unreasonable setting of the starting power threshold or inaccurate monitoring of the storage battery sensor in the prior art, and improve the accuracy and reliability of the vehicle's low-voltage storage battery monitoring.

[0030] In some embodiments, as Figure 2 shown, the current starting current reference curve is a constant current discharge curve for multiple unit time periods within a preset time.

[0031] Step S20 includes:

[0032] Determine the predicted voltage of the storage battery after constant current discharge for the multiple unit time periods according to the current voltage of the storage battery, and determine whether it meets the current starting current reference curve according to the comparison result between the predicted voltage of the storage battery and the preset lower voltage limit.

[0033] Specifically, the battery sensor can monitor the state of the storage battery in real time, including battery voltage, health, state of charge, etc. Given the state of the storage battery and the discharge demand (discharge current curve), the current curve of the discharge demand is equivalent to a constant current discharge per unit time. For example, Figure 2 the curve in is the discharge current curve after starting condition correction, which is equivalent to a constant current discharge per second, as shown in the bar chart in Figure 2 .

[0034] Such asFigure 2 As shown, the currents of each constant-current discharge within the preset time are different. For example, they are 22A, 26A, 29A, and 21A respectively. Assuming the current voltage state of the storage battery is V0, it can be determined whether it satisfies continuous discharge at 22A for 1 second. The determination method is as follows: Given the current voltage of the storage battery, through the built-in parameters of the storage battery sensor (the built-in parameters need to be modeled and calibrated based on the charge and discharge test data of the storage battery), the voltage drop Δv1 during the discharge process can be fitted and the voltage V1 after discharge can be calculated. If V1 is still greater than the preset voltage lower limit value V 下限 (It can still be calibrated through the test data of the storage battery), then it is determined to be satisfied; otherwise, it is not satisfied. If satisfied, continue to predict whether it is satisfied after continuous discharge at 26A for 1 second with V1 as the initial voltage. If satisfied, calculate the voltage drop after discharge to be V2 = V1 - Δv2, and so on. Determine whether it satisfies the next constant-current discharge after each voltage drop and judge the voltage drop level after the constant-current discharge, V n = V n-1 -Δv n ; If the current voltage V0 of the storage battery satisfies that after each constant-current discharge within the time t, V n still satisfies being greater than the lower limit value V 下限 , then it satisfies the starting condition; otherwise, it does not satisfy.

[0035] In some embodiments, the method includes:

[0036] Step S40, obtaining the current reference power of the storage battery, where the current reference current of the storage battery is the maximum value of the storage battery currents during the last m start-up failures; m is a preset value.

[0037] Specifically, the current reference power of the storage battery refers to the most recently updated reference power of the storage battery. The reference power of the storage battery is a standard or benchmark for comparing the current state of charge (SOC) of the storage battery and the power required to start the vehicle. In this embodiment, it is recorded whether each start attempt is successful. When the vehicle attempts to start, the storage battery discharges externally. After successful start-up, the generator or DCDC supplies power to the entire vehicle. At this time, the current flowing through the storage battery sensor will reverse to discharge. The reverse direction of the storage battery current is used as the identification of successful start-up. By analyzing the storage battery power data during the last m vehicle start-up failures and comparing these data, the maximum storage battery power value will be selected as the new reference power. This maximum power value represents the highest level of the storage battery power in the case of start-up failure. Therefore, updating the reference power of the storage battery to this maximum power value can improve the reliability of the alarm. The preset value m can be set according to the usage of the vehicle and the performance of the storage battery to ensure that the update of the reference power is both accurate and representative.

[0038] Step S50, obtain the current battery power, and determine whether to give an alarm according to the comparison result between the current battery power and the current battery reference power.

[0039] Specifically, the current battery power (SOC) is monitored in real time and compared with the current battery reference power obtained in step S40. If the current battery power (SOC) is lower than the current battery reference power, the alarm mechanism will be triggered to notify the driver that the battery power is low and it is necessary to charge or replace the battery. This can ensure that the driver receives sufficient warning before the battery power drops to a level that may affect vehicle starting. Specifically, for example, a buzzer is installed inside the vehicle to emit a loud warning sound; for another example, a warning light on the dashboard lights up, which can be an icon indicating the battery power; for another example, a warning message is displayed on the vehicle's display screen or a dialog box pops up; for another example, a notification or warning is sent through the mobile application connected to the vehicle; for another example, the vehicle's built-in voice system broadcasts a warning message, such as "The battery power is low. Please charge as soon as possible."

[0040] In some embodiments, the method includes:

[0041] Step S70, obtain the outside temperature before this start and the outside temperature before the last vehicle shutdown.

[0042] Specifically, the outside temperature before vehicle starting can be obtained through the vehicle's environmental sensor or external temperature sensor. At the same time, the outside temperature data before the last vehicle shutdown is retrieved from the vehicle's memory. These temperature data are very important for evaluating the performance of the battery and the expected starting current because temperature is a key factor affecting battery performance.

[0043] Step S80, if the outside temperature before the last vehicle shutdown is less than the first preset temperature value, and the temperature difference between the outside temperature before this start and the outside temperature before the last vehicle shutdown is greater than the second preset temperature value, initialize the current starting current reference curve and the current battery reference power.

[0044] Specifically, check whether the outside temperature before the last vehicle shutdown is less than the first preset temperature value, for example, -20°. This preset temperature value may be set by the manufacturer based on the research results of battery performance and the influence of low temperature on starting current.

[0045] Calculate the temperature difference between the outside temperature before this start and the outside temperature before the last vehicle shutdown, and check whether this temperature difference is greater than the second preset temperature value. This preset temperature value is used to determine whether the temperature change is large enough to possibly affect the performance of the battery, for example, 20°.

[0046] If the above two conditions are both satisfied, the current starting current reference curve and the current reference battery power will be initialized. The initialization process includes resetting the starting current reference curve to a default value or an estimated value based on the new temperature conditions, and resetting the reference battery power to a default value or an estimated value based on the new temperature conditions. It should be noted that the purpose of initialization is to ensure that under the condition of large temperature changes, the performance of the battery can be re-evaluated based on the new environmental conditions, so as to improve the accuracy and reliability of monitoring. A significant change in temperature may affect the discharge capacity of the battery and the starting current requirement. Therefore, re-initializing the reference curve and the reference power can prevent false alarms caused by temperature changes.

[0047] Refer to Figure 3 , corresponding to the method of the above embodiment, another embodiment of the present invention provides a vehicle low-voltage battery monitoring device, including:

[0048] A reference curve acquisition module 1, configured to acquire the current starting current reference curve, where the current starting current reference curve is the maximum power consumption current curve of the starting current curve of the battery during the successful starting of the vehicle in the most recent n times; n is a preset value;

[0049] A first battery warning module 2, configured to acquire the current voltage of the battery, and determine whether the current discharge capacity of the battery meets the current starting current reference curve according to the current voltage of the battery. If not, an alarm is given.

[0050] In some embodiments, the current starting current reference curve is a constant current discharge curve in multiple unit time periods within a preset time;

[0051] The first battery warning module 2 is configured to determine a predicted battery voltage value after constant current discharge in multiple unit time periods according to the current voltage of the battery, and determine whether it meets the current starting current reference curve according to the comparison result between the predicted battery voltage value and a preset voltage lower limit value.

[0052] In some embodiments, the device includes:

[0053] A reference power acquisition module, configured to acquire the current reference battery power, where the current reference battery current is the maximum value of the battery current during the failure of the most recent m starts; m is a preset value;

[0054] A second battery warning module, configured to acquire the current battery power, and determine whether to give an alarm according to the comparison result between the current battery power and the current reference battery power.

[0055] In some embodiments, the device includes:

[0056] A temperature acquisition module, configured to acquire the external temperature before the current start and the external temperature before the previous vehicle flameout.

[0057] An initialization module, configured to initialize the current starting current reference curve and the current battery reference power when the external temperature before the previous vehicle flameout is less than a first preset temperature value, and the temperature difference between the external temperature before the current start and the external temperature before the previous vehicle flameout is greater than a second preset temperature value.

[0058] It should be noted that the modules in the device of this embodiment can be implemented based on software, based on hardware, or based on a combination of software and hardware. The device provided in this embodiment can be used to execute the method described in the above embodiment. Therefore, the content not detailed in this embodiment can be obtained by referring to the content of the method in the above embodiment, and thus will not be elaborated here.

[0059] Another embodiment of the present invention provides a vehicle low-voltage battery monitoring device, including:

[0060] A communication interface, configured to communicate with other electronic devices;

[0061] A memory, configured to store computer program instructions;

[0062] A processor, configured to execute the computer program instructions to support the device to implement the method described in the above embodiment.

[0063] In this embodiment, the memory mainly includes a program storage area and a data storage area. Among them, the program storage area can store operating devices, application programs required for at least one function, etc., and the data storage area can store relevant data, etc. In addition, the memory can be a high-speed random access memory, or a non-volatile memory, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a FlashCard, etc., or the memory can also be other volatile solid-state storage devices.

[0064] The processor may be a Central Processing Unit (CPU), or may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor, or the processor may also be any conventional processor. The processor is the control center of the device, and uses various interfaces and circuits to connect each part of the device.

[0065] Another embodiment of the present invention provides a vehicle, including the vehicle low-voltage battery monitoring device described in the above embodiment.

[0066] Another embodiment of the present invention provides a computer program product, including computer program instructions, and the computer program instructions direct a computer device to perform operations corresponding to the method described in the above embodiment.

[0067] Specifically, the computer program product includes a series of computer program instructions, which are codes written in the computer program. They define how to perform specific operations. These computer program instructions are designed to be loaded onto a computer device and guide the device to perform specific operations, which refer to the various steps in the vehicle low-voltage battery monitoring method described in the above embodiment. In this way, the computer program product of this embodiment provides a complete software solution, which can run on various computer devices, implement the vehicle low-voltage battery monitoring method described in the above embodiment. Implementing the monitoring method using a computer program product is easy to integrate with other vehicle electronic systems and improves the vehicle's intelligent level.

[0068] The above has described the embodiments of the present invention. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other ordinary skill in the art in the technical field to understand the embodiments disclosed herein.

Claims

1. A method for monitoring a low-voltage vehicle battery, characterized in that, The method includes: Obtain the current starting current reference curve, where the current starting current reference curve is the maximum power consumption current curve of the starting current curve of the battery during the successful starting of the vehicle in the most recent n times; n is a preset value; Obtain the current voltage of the battery, and determine whether the current discharge capacity of the battery meets the current starting current reference curve according to the current voltage of the battery. If it does not meet, an alarm is given.

2. The method according to claim 1, wherein The current starting current reference curve is a constant current discharge curve in multiple unit time periods within a preset time; Determining whether the current discharge capacity of the battery meets the current starting current reference curve according to the current battery state information includes: Determine the predicted value of the battery voltage after constant current discharge in the multiple unit time periods according to the current voltage of the battery, and determine whether it meets the current starting current reference curve according to the comparison result between the predicted value of the battery voltage and the preset lower voltage limit value.

3. The method according to claim 1, wherein The method includes: Obtain the current reference power of the battery, where the current reference current of the battery is the maximum value of the battery current during the most recent m times of starting failures; m is a preset value; Obtain the current power of the battery, and determine whether to give an alarm according to the comparison result between the current power of the battery and the current reference power of the battery.

4. The method according to claim 3, characterized in that The method includes: Obtain the external temperature before this start and the external temperature before the previous vehicle shutdown; If the external temperature before the previous vehicle shutdown is less than the first preset temperature value, and the temperature difference between the external temperature before this start and the external temperature before the previous vehicle shutdown is greater than the second preset temperature value, initialize the current starting current reference curve and the current reference power of the battery.

5. A vehicle low-voltage battery monitoring device, characterized in that, Includes: A reference curve acquisition module, configured to obtain the current starting current reference curve, where the current starting current reference curve is the maximum power consumption current curve of the starting current curve of the battery during the successful starting of the vehicle in the most recent n times; n is a preset value; A first battery warning module, configured to obtain the current voltage of the battery, and determine whether the current discharge capacity of the battery meets the current starting current reference curve according to the current voltage of the battery. If it does not meet, an alarm is given.

6. The device according to claim 5, characterized in that, The current starting current reference curve is a constant current discharge curve in multiple unit time periods within a preset time; The first battery warning module is configured to determine the predicted value of the battery voltage after constant current discharge in the multiple unit time periods according to the current voltage of the battery, and determine whether it meets the current starting current reference curve according to the comparison result between the predicted value of the battery voltage and the preset lower voltage limit value.

7. The device according to claim 5, characterized in that The device includes: A reference power acquisition module, configured to obtain the current reference power of the battery, where the current reference current of the battery is the maximum value of the battery current during the most recent m times of starting failures; m is a preset value; A second battery warning module, configured to obtain the current power of the battery, and determine whether to give an alarm according to the comparison result between the current power of the battery and the current reference power of the battery.

8. A vehicle low-voltage battery monitoring device, characterized in that, Includes: A communication interface, configured to communicate with other electronic devices; A memory, configured to store computer program instructions; A processor for executing the computer program instructions to support the device in implementing the method according to any one of claims 1 to 4.

9. A vehicle, characterized in that, Comprising the vehicle low-voltage battery monitoring device according to any one of claims 5 to 7.

10. A computer program product, characterized in that, Comprising computer program instructions which direct a computer device to perform operations corresponding to the method according to any one of claims 1 to 4.

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