OBU operation and maintenance optimization method and device based on transaction log storage

Abstract

The present invention relates to an OBU operation and maintenance optimization method based on transaction log storage. In order to better store the transaction log of the OBU, by monitoring the instantaneous value of the power supply voltage of the OBU and setting a floating voltage threshold, RAM storage is performed when the instantaneous value of the power supply voltage is not lower than the floating voltage threshold, and FLASH storage is performed when the instantaneous value of the power supply voltage is lower than the floating voltage threshold. When operation and maintenance are required, the stored transaction log is obtained, and the stored transaction log is sent to an administrator IP to assist the administrator in performing OBU operation and maintenance. In this way, a more reasonable storage method for the transaction log can be selected, on the one hand, the FLASH service life of the OBU is extended, and on the other hand, the existing problem of loss of the transaction log stored in RAM due to unstable power supply voltage caused by using a fixed threshold value as a judgment condition is optimized; thereby providing better data support for operation and maintenance based on the OBU transaction log.

Description

Technical Field

[0001] The present invention relates to the technical field related to OBU, and in particular to an OBU operation and maintenance optimization method and device based on transaction log storage. Background Art

[0002] OBU is an offline device. When problems arise and maintenance is required, the only judgment point can be made based on the phenomenon and user description. The fee display prompts at the toll station can find 85% of the problems, and the rest depends on guesswork and consulting the toll station. Equipment manufacturers are often confused because they cannot find the problem, so logs are needed to assist in analysis. OBU logs include a variety of information, such as power usage, transaction time, number of awakenings, number of false awakenings, number of transactions entered but not successful, total working time from awakening to sleep OBU, etc.

[0003] Considering the existing main control chip resources, the OBU log can only save the two most recent transaction logs, and FLASH cannot be used as the main storage method, because FLASH has an erase life, which is 10W times for general single-chip microcomputers. If each transaction is saved, it will greatly shorten the FLASH life of the OBU. However, when the MCU operating voltage of the OBU is lower than the operating voltage threshold, the RAM content will be lost, and the use of specific peripherals may bring certain voltage noise or current load to the MCU power supply system of the OBU. If these noises or loads exceed the tolerance range of the MCU design, the power supply voltage may be unstable, which will affect the storage of data in the RAM. Summary of the invention

[0004] The purpose of the present invention is to solve at least one of the deficiencies of the prior art and to provide an OBU operation and maintenance optimization method and device based on transaction log storage.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] Specifically, an OBU operation and maintenance optimization method based on transaction log storage is proposed, including the following:

[0007] Obtain the transaction log generated by the OBU after completing the DSRC transaction process, and record the time t at this time;

[0008] The instantaneous value of the power supply voltage of the OBU is monitored at a period T from a preset starting time t0, and sampling is performed at equal intervals in the period T to obtain a power supply voltage instantaneous value sequence Ti (i) corresponding to a plurality of sampling periods Ti;

[0009] Calculate the valley voltage approach rate val(Ti) corresponding to each sampling period based on the power supply voltage instantaneous value sequence Ti(i);

[0010] Based on the valley voltage approach rate val(Ti), the floating voltage threshold UTh(Ti) of the corresponding sampling period is obtained;

[0011] Determine the sampling period at time t, obtain the floating voltage threshold at time t based on the sampling period, and read the instantaneous value of the power supply voltage of the OBU at time t;

[0012] Determine whether the instantaneous value of the power supply voltage of the OBU at time t is lower than the floating voltage threshold at time t, if so, save the transaction log generated at time t to FLASH, if not, save the transaction log generated at time t to RAM;

[0013] Obtain the saved transaction logs and send them to the administrator IP to assist the administrator in OBU operation and maintenance.

[0014] Further, specifically, the valley voltage approach rate val(Ti) corresponding to each sampling period Ti is calculated based on the power supply voltage instantaneous value sequence Ti(i), including:

[0015] Define Ti(i, Uj) as the jth power supply voltage instantaneous value in the power supply voltage instantaneous value sequence Ti(i);

[0016] The formula for calculating the valley voltage trend Ex(i, j) of any instantaneous value j of the power supply voltage in Ti(i) is as follows:

[0017] ;

[0018] Where max(i, Uj), avg(i, Uj) and min(i, Uj) are the maximum, average and minimum values ​​of the instantaneous value of the power supply voltage in Ti(i, Uj) respectively;

[0019] The valley voltage approach rate val(Ti) corresponding to each sampling period is calculated based on the valley voltage trend.

[0020] Further, specifically, the valley voltage approach rate val(Ti) corresponding to each sampling period T is calculated based on the valley voltage trend, including:

[0021] For the first sampling period, i.e., T1, all valley voltage trends in T1 are traversed, valley voltage trends that are less than the first threshold are found and their number P is counted, and the ratio Q of the number P to the total number of valley voltage trends in the sampling period T1 is calculated. The ratio Q is the valley voltage approach rate val(T1) corresponding to the period T1;

[0022] For other periods Ti except the first sampling period, calculate Ti-1 (i-1), that is, the average value avg-Ex (i-1) of the valley voltage trend corresponding to the previous period of other periods Ti, take avg-Ex (i-1) as the judgment threshold, traverse all valley voltage trends in Ti, find out the valley voltage trends that are less than the judgment threshold and count their number P1, calculate the ratio Q1 of the number P1 to the total number of valley voltage trends in the sampling period Ti, then the ratio Q1 is the valley voltage approximation rate val (Ti) corresponding to the period Ti.

[0023] Further, specifically, based on the valley voltage approaching rate val(Ti), the floating voltage threshold UTh(Ti) of the corresponding sampling period is obtained, including:

[0024] Multiple range intervals are preset, each range interval corresponds to a floating voltage threshold;

[0025] The current range interval of the valley voltage approaching rate val (Ti) is determined, and the floating voltage threshold UTh (Ti) corresponding to the current range interval is read. Then UTh (Ti) is the floating voltage threshold value of the sampling period corresponding to the valley voltage approaching rate val (Ti).

[0026] Further, specifically, the saved transaction log is obtained through Bluetooth or a serial port, and the saved transaction log is sent to the visitor IP, that is, the administrator IP.

[0027] The present invention also proposes an OBU operation and maintenance optimization device based on transaction log storage, comprising:

[0028] The transaction log acquisition module is used to obtain the transaction log generated by the OBU after completing the DSRC transaction process and record the time t at this time;

[0029] The data acquisition module is used to monitor the instantaneous value of the power supply voltage of the OBU in a period T from a preset starting time t0, and perform equal-interval sampling in the period T to obtain a power supply voltage instantaneous value sequence Ti (i) corresponding to a plurality of sampling periods Ti;

[0030] A first calculation module is used to calculate the valley voltage approach rate val(Ti) corresponding to each sampling period based on the power supply voltage instantaneous value sequence Ti(i);

[0031] A second calculation module is used to obtain a floating voltage threshold UTh(Ti) of a corresponding sampling period based on a valley voltage approaching rate val(Ti);

[0032] A floating voltage threshold determination module is used to determine the sampling period at time t, obtain the floating voltage threshold at time t based on the sampling period, and read the instantaneous value of the power supply voltage of the OBU at time t;

[0033] A saving mode judgment module is used to judge whether the instantaneous value of the power supply voltage of the OBU at time t is lower than the floating voltage threshold at time t, if yes, the transaction log generated at time t is saved to FLASH, if no, the transaction log generated at time t is saved to RAM;

[0034] The transaction log query module is used to obtain the saved transaction log and send the saved transaction log to the administrator IP to assist the administrator in OBU operation and maintenance.

[0035] The beneficial effects of the present invention are:

[0036] The present invention proposes an OBU operation and maintenance optimization method based on transaction log storage. In order to better store the transaction log of the OBU, by monitoring the instantaneous value of the power supply voltage of the OBU and setting the floating voltage threshold, RAM storage is performed when the instantaneous value of the power supply voltage is not lower than the floating voltage threshold, and FLASH storage is performed when the instantaneous value of the power supply voltage is lower than the floating voltage threshold. When operation and maintenance are required, the stored transaction log is obtained, and the stored transaction log is sent to the administrator IP to assist the administrator in performing OBU operation and maintenance. In this way, a more reasonable way of storing the transaction log can be selected, on the one hand, the FLASH service life of the OBU is extended, and on the other hand, the existing problem of loss of the transaction log stored in RAM due to unstable power supply voltage caused by using a fixed threshold value as a judgment condition is optimized; thereby providing better data support for operation and maintenance based on the OBU transaction log. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The above and other features of the present disclosure will become more apparent by describing in detail the embodiments shown in the accompanying drawings. The same reference numerals in the accompanying drawings of the present disclosure represent the same or similar elements. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure. For those skilled in the art, other accompanying drawings can be obtained based on these accompanying drawings without creative work. In the accompanying drawings:

[0038] Figure 1 Shown is a flow chart of an OBU operation and maintenance optimization method based on transaction log storage of the present invention;

[0039] Figure 2 Shown is a basic principle diagram of the OBU operation and maintenance optimization method based on transaction log storage of the present invention. DETAILED DESCRIPTION

[0040] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the present invention, so as to fully understand the purpose, scheme and effect of the present invention. It should be noted that the embodiments in this application and the features in the embodiments can be combined with each other without conflict. The same reference numerals used throughout the drawings indicate the same or similar parts.

[0041] Reference Figure 1 , Example 1, based on Figure 2 The present invention proposes an OBU operation and maintenance optimization method based on transaction log storage, including the following:

[0042] Step 110, obtaining the transaction log generated by the OBU after completing the DSRC transaction process, and recording the time t at this time;

[0043] Step 210, monitoring the instantaneous value of the power supply voltage of the OBU at a period T from a preset starting time t0, and performing equal-interval sampling in the period T to obtain a power supply voltage instantaneous value sequence Ti(i) corresponding to a plurality of sampling periods Ti;

[0044] Step 310, calculating the valley voltage approach rate val(Ti) corresponding to each sampling period based on the power supply voltage instantaneous value sequence Ti(i);

[0045] Step 410 , obtaining a floating voltage threshold UTh(Ti) of a corresponding sampling period based on the valley voltage approaching rate val(Ti);

[0046] Step 510, determine the sampling period at time t, obtain the floating voltage threshold at time t based on the sampling period, and read the instantaneous value of the power supply voltage of the OBU at time t;

[0047] Step 610: determine whether the instantaneous value of the power supply voltage of the OBU at time t is lower than the floating voltage threshold at time t, if yes, save the transaction log generated at time t to FLASH, if no, save the transaction log generated at time t to RAM;

[0048] Step 710: Obtain the saved transaction log, and send the saved transaction log to the administrator IP to assist the administrator in performing OBU operation and maintenance.

[0049] In the present embodiment 1, in order to better preserve the transaction log of the OBU, by monitoring the instantaneous value of the power supply voltage of the OBU and setting the floating voltage threshold, RAM storage is performed when the instantaneous value of the power supply voltage is not lower than the floating voltage threshold, and FLASH storage is performed when the instantaneous value of the power supply voltage is lower than the floating voltage threshold. In this way, a more reasonable way of preserving the transaction log can be selected, which, on the one hand, prolongs the service life of the FLASH of the OBU, and on the other hand, optimizes the existing problem of loss of the transaction log stored in the RAM due to unstable power supply voltage when a fixed threshold value is used as a judgment condition; thereby providing better data support for operation and maintenance based on the OBU transaction log.

[0050] As a preferred embodiment of the present invention, specifically, the valley voltage approach rate val(Ti) corresponding to each sampling period Ti is calculated based on the power supply voltage instantaneous value sequence Ti(i), including:

[0051] Define Ti(i, Uj) as the jth power supply voltage instantaneous value in the power supply voltage instantaneous value sequence Ti(i);

[0052] The formula for calculating the valley voltage trend Ex(i, j) of any instantaneous value j of the power supply voltage in Ti(i) is as follows:

[0053] ;

[0054] Where max(i, Uj), avg(i, Uj) and min(i, Uj) are the maximum, average and minimum values ​​of the instantaneous value of the power supply voltage in Ti(i, Uj) respectively;

[0055] The valley voltage approach rate val(Ti) corresponding to each sampling period is calculated based on the valley voltage trend.

[0056] Specifically, the valley voltage approach rate val(Ti) corresponding to each sampling period T is calculated based on the valley voltage trend, including:

[0057] For the first sampling period, i.e., T1, all valley voltage trends in T1 are traversed, valley voltage trends that are less than the first threshold are found and their number P is counted, and the ratio Q of the number P to the total number of valley voltage trends in the sampling period T1 is calculated. The ratio Q is the valley voltage approach rate val(T1) corresponding to the period T1;

[0058] For other periods Ti except the first sampling period, calculate Ti-1 (i-1), that is, the average value avg-Ex (i-1) of the valley voltage trend corresponding to the previous period of other periods Ti, take avg-Ex (i-1) as the judgment threshold, traverse all valley voltage trends in Ti, find out the valley voltage trends that are less than the judgment threshold and count their number P1, calculate the ratio Q1 of the number P1 to the total number of valley voltage trends in the sampling period Ti, then the ratio Q1 is the valley voltage approximation rate val (Ti) corresponding to the period Ti.

[0059] In this preferred embodiment, considering that the current OBU market generally believes that the MCU operating voltage is 2.0 to 5.5V, and the operating voltage of other peripherals is 2.8 to 3.6, when the MCU is lower than 2V, the RAM will be lost. As for the voltage fluctuation to a higher level, it is not easy to cause the impact of power failure, but only hi makes the battery life receive a certain degree of damage. Therefore, we design the valley voltage approach rate, by calculating the valley voltage trend of any power supply voltage instantaneous value j, and then calculating the proportion of the valley voltage trend in the set to determine the valley voltage approach rate, and then dynamically change the voltage threshold;

[0060] When calculating the valley voltage approaching rate, the influence of the time axis is taken into consideration and the judgment threshold is dynamically adjusted according to the valley voltage trend of the previous cycle, so that the judgment threshold can be made more reasonable as much as possible.

[0061] As a preferred embodiment of the present invention, specifically, obtaining the floating voltage threshold UTh(Ti) of the corresponding sampling period based on the valley voltage approaching rate val(Ti) includes:

[0062] Multiple range intervals are preset, each range interval corresponds to a floating voltage threshold;

[0063] The current range interval of the valley voltage approaching rate val (Ti) is determined, and the floating voltage threshold UTh (Ti) corresponding to the current range interval is read. Then UTh (Ti) is the floating voltage threshold value of the sampling period corresponding to the valley voltage approaching rate val (Ti).

[0064] In this preferred embodiment, a plurality of reasonable range intervals of valley voltage approximation rates and corresponding relationships with floating voltage thresholds are set by way of pre-experiments. When applied, it is only necessary to determine the calculation result of the valley voltage approximation rate of the cycle at the current moment t to determine the current floating voltage threshold, and further determine the method for saving the transaction log.

[0065] As a preferred implementation mode of the present invention, specifically, the stored transaction log is obtained through Bluetooth or a serial port, and the stored transaction log is sent to the visitor IP, that is, the administrator IP.

[0066] The present invention also proposes an OBU operation and maintenance optimization device based on transaction log storage, comprising:

[0067] The transaction log acquisition module is used to obtain the transaction log generated by the OBU after completing the DSRC transaction process and record the time t at this time;

[0068] The data acquisition module is used to monitor the instantaneous value of the power supply voltage of the OBU in a period T from a preset starting time t0, and perform equal-interval sampling in the period T to obtain a power supply voltage instantaneous value sequence Ti (i) corresponding to a plurality of sampling periods Ti;

[0069] A first calculation module is used to calculate the valley voltage approach rate val(Ti) corresponding to each sampling period based on the power supply voltage instantaneous value sequence Ti(i);

[0070] A second calculation module is used to obtain a floating voltage threshold UTh(Ti) of a corresponding sampling period based on a valley voltage approaching rate val(Ti);

[0071] A floating voltage threshold determination module is used to determine the sampling period at time t, obtain the floating voltage threshold at time t based on the sampling period, and read the instantaneous value of the power supply voltage of the OBU at time t;

[0072] A saving mode judgment module is used to judge whether the instantaneous value of the power supply voltage of the OBU at time t is lower than the floating voltage threshold at time t, if yes, the transaction log generated at time t is saved to FLASH, if no, the transaction log generated at time t is saved to RAM;

[0073] The transaction log query module is used to obtain the saved transaction log and send the saved transaction log to the administrator IP to assist the administrator in OBU operation and maintenance.

[0074] In addition, each functional module in each embodiment of the present invention may be integrated into one processing module, or each module may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of software functional modules.

[0075] If the integrated module is implemented in the form of a software function module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the processes in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned various method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or system that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), electrical carrier signal, telecommunication signal and software distribution medium, etc.

[0076] Although the description of the present invention has been quite detailed and specifically describes several described embodiments, it is not intended to be limited to any of these details or embodiments or any particular embodiment, but should be regarded as providing a broad possible interpretation of these claims in view of the prior art by reference to the appended claims, thereby effectively covering the intended scope of the present invention. In addition, the above description of the present invention is based on the embodiments foreseeable by the inventor, and its purpose is to provide a useful description, and those non-substantial changes to the present invention that have not yet been foreseen may still represent equivalent changes to the present invention.

[0077] The above is only a preferred embodiment of the present invention. The present invention is not limited to the above implementation. As long as the technical effect of the present invention is achieved by the same means, it should belong to the protection scope of the present invention. Within the protection scope of the present invention, its technical scheme and / or implementation method can have various modifications and changes.

Claims

1. The OBU operation and maintenance optimization method based on transaction log storage is characterized in that: Includes the following: Obtain the transaction log generated by the OBU after completing the DSRC transaction process, and record the time t at this time; The instantaneous value of the power supply voltage of the OBU is monitored at a period T from a preset starting time t0, and sampling is performed at equal intervals in the period T, and finally a power supply voltage instantaneous value sequence Ti (i) corresponding to a plurality of sampling periods Ti is obtained, where i is a sequence number value; Calculate the valley voltage approach rate val(Ti) corresponding to each sampling period based on the power supply voltage instantaneous value sequence Ti(i); Based on the valley voltage approach rate val(Ti), the floating voltage threshold UTh(Ti) of the corresponding sampling period is obtained; Determine the sampling period at time t, obtain the floating voltage threshold at time t based on the sampling period, and read the instantaneous value of the power supply voltage of the OBU at time t; Determine whether the instantaneous value of the power supply voltage of the OBU at time t is lower than the floating voltage threshold at time t, if so, save the transaction log generated at time t to FLASH, if not, save the transaction log generated at time t to RAM; Obtain the saved transaction logs and send them to the administrator IP to assist the administrator in OBU operation and maintenance; Specifically, the valley voltage approach rate val(Ti) corresponding to each sampling period Ti is calculated based on the power supply voltage instantaneous value sequence Ti(i), including: Define Ti(i, Uj) as the jth power supply voltage instantaneous value in the power supply voltage instantaneous value sequence Ti(i); Calculate the valley voltage trend of any instantaneous value j of the power supply voltage in Ti (i) , The formula is as follows, ； in max(i,Uj) , avg(i,Uj) as well as min(i,Uj) They are Ti(i,Uj) The maximum, average and minimum values ​​of the instantaneous value of the power supply voltage; Calculate the valley voltage approach rate val (Ti) corresponding to each sampling period based on the valley voltage trend; Specifically, the valley voltage approach rate val(Ti) corresponding to each sampling period T is calculated based on the valley voltage trend, including: For the first sampling period, i.e., T1, all valley voltage trends in T1 are traversed, valley voltage trends that are less than the first threshold are found and their number P is counted, and the ratio Q of the number P to the total number of valley voltage trends in the sampling period T1 is calculated. The ratio Q is the valley voltage approach rate val(T1) corresponding to the period T1; For other cycles Ti except the first sampling cycle, calculate Ti-1 (i-1), which is the average value avg- of the valley voltage trend corresponding to the previous cycle of other cycles Ti. Ex (i-1), to avg- Ex (i-1) is used as the judgment threshold, and all valley voltage trends in Ti are traversed to find the valley voltage trends that are less than the judgment threshold and count their number P1. The ratio Q1 of the number P1 to the total number of valley voltage trends in the sampling period Ti is calculated. The ratio Q1 is the valley voltage approach rate val(Ti) corresponding to the period Ti. Specifically, based on the valley voltage approach rate val(Ti), the floating voltage threshold UTh(Ti) of the corresponding sampling period is obtained, including: Multiple range intervals are preset, each range interval corresponds to a floating voltage threshold; The current range interval of the valley voltage approaching rate val (Ti) is determined, and the floating voltage threshold UTh (Ti) corresponding to the current range interval is read. Then UTh (Ti) is the floating voltage threshold value of the sampling period corresponding to the valley voltage approaching rate val (Ti).

2. The OBU operation and maintenance optimization method based on transaction log preservation according to claim 1, characterized in that, Specifically, the saved transaction log is obtained through Bluetooth or a serial port, and the saved transaction log is sent to the visitor IP, that is, the administrator IP.

3. An OBU operation and maintenance optimization device based on transaction log storage, characterized in that: The OBU operation and maintenance optimization method based on transaction log storage described in claim 1 is applied, comprising: The transaction log acquisition module is used to obtain the transaction log generated by the OBU after completing the DSRC transaction process and record the time t at this time; The data acquisition module is used to monitor the instantaneous value of the power supply voltage of the OBU in a period T from a preset starting time t0, perform equal-spaced sampling in the period T, and finally obtain a power supply voltage instantaneous value sequence Ti (i) corresponding to a plurality of sampling periods Ti; A first calculation module is used to calculate the valley voltage approach rate val(Ti) corresponding to each sampling period based on the power supply voltage instantaneous value sequence Ti(i); A second calculation module is used to obtain a floating voltage threshold UTh(Ti) of a corresponding sampling period based on a valley voltage approaching rate val(Ti); A floating voltage threshold determination module is used to determine the sampling period at time t, obtain the floating voltage threshold at time t based on the sampling period, and read the instantaneous value of the power supply voltage of the OBU at time t; A saving mode judgment module is used to judge whether the instantaneous value of the power supply voltage of the OBU at time t is lower than the floating voltage threshold at time t, if yes, the transaction log generated at time t is saved to FLASH, if no, the transaction log generated at time t is saved to RAM; The transaction log query module is used to obtain the saved transaction log and send the saved transaction log to the administrator IP to assist the administrator in OBU operation and maintenance.

Images