A mileage measurement method for automobile loss assessment

Abstract

The present invention relates to the technical field of automobile mileage measurement and discloses a mileage measurement method for automobile loss assessment, including a vehicle-mounted system. The mileage measurement method comprises the following steps: step 1, a data acquisition module collects vehicle driving data and determines a measurement mode; step 2, a measurement and analysis module performs a new round of main function loop process based on the vehicle driving data and the previous round of loop data; step 3, the measurement and analysis module determines the validity of the vehicle driving data; step 4, the measurement and analysis module calculates and generates a subtotal mileage Xjd, and determines whether to continue accumulation; step 5, the measurement and analysis module accumulates and generates a total mileage Zjd, and determines whether to continue accumulation, so that the mileage accumulation measurement accuracy is higher; step 6, the measurement and analysis module performs a parity check and stores and backs up the corresponding records, completing the main function loop process of a single round, so that the loss assessment is more realistic and accurate.

Description

Technical Field

[0001] The present invention relates to the technical field of automobile mileage measurement, and in particular to a mileage measurement method for automobile loss assessment. Background Art

[0002] Total mileage is a crucial metric used to measure a vehicle's lifespan. When buying or selling used cars or replacing them, total mileage can be used to estimate the vehicle's wear and tear, thus largely determining its value. The price of a used car is largely determined by its mileage; lower mileage typically translates to higher prices. It not only reflects vehicle usage but also provides a basis for maintenance and upkeep. Mileage is typically measured in kilometers (km) or miles (mi). Traditional methods use speed sensors and tachometers to measure tire rotations. Modern technology uses electronic speedometers to accumulate mileage using pulse generators and electrical pulse counters. However, when measuring mileage from a single source, total mileage can easily fluctuate, leading to unreliable total mileage. Furthermore, some unscrupulous dealers may manipulate odometers to conceal the vehicle's actual distance traveled. Therefore, more accurate and reliable methods are needed to record total mileage.

[0003] At present, the traditional automobile mileage measurement method relies on a single data source, the cumulative measurement accuracy is low, and it cannot intuitively reflect the degree of vehicle wear and tear, which greatly affects the price evaluation of secondary sales. Summary of the Invention

[0004] (1) Technical problems solved

[0005] In response to the shortcomings of the existing technology, the present invention provides a mileage measurement method for automobile loss assessment, which has the advantages of higher mileage accumulation measurement accuracy and more realistic and accurate loss assessment. It solves the problem of low measurement accuracy and inability to intuitively reflect the degree of vehicle loss in traditional automobile mileage measurement methods.

[0006] (2) Technical solution

[0007] To achieve the above objectives, the present invention provides the following technical solutions: a method for measuring mileage for automobile wear and tear assessment, comprising a vehicle-mounted system for providing vehicle driving data. The method is implemented by the mileage measurement system for automobile wear and tear assessment, the mileage measurement system comprising a data acquisition module and a measurement and analysis module. The method comprises:

[0008] Step 1: After the data acquisition module is connected to the vehicle system through the network, it collects vehicle driving data and determines the corresponding mileage measurement method. If the KL15 in the vehicle system is powered on, the data acquisition module transmits the vehicle driving data to the measurement and analysis module;

[0009] Step 2: Whenever KL15 in the vehicle system is powered on, the measurement and analysis module connects to the Even area and Odd area in the vehicle system through the network to collect the data of the previous round of main function cycle process, and performs a new round of main function cycle process based on the vehicle driving data and the data of the previous round of main function cycle process;

[0010] Step 3: The measurement and analysis module is set with a standard transmission time and a standard speed range, and determines the validity of the vehicle driving data based on the standard transmission time and the standard speed range. If the vehicle driving data does not exceed the standard transmission time and the standard speed range, it means that the vehicle driving data is highly valid, and the data is organized into a speed data set;

[0011] Step 4: The measurement and analysis module calculates and generates a subtotal mileage Xjd based on the driving data set, and determines whether to continue accumulation based on the subtotal mileage Xjd;

[0012] Step 5: The measurement and analysis module generates the total mileage Zjd based on the accumulated subtotal mileage Xjd, and determines whether to continue accumulating based on the total mileage Zjd;

[0013] Step 6: The measurement and analysis module performs parity check based on the final total mileage Zjd, and records it accordingly in the Even area or Odd area in the vehicle system, completing the main function loop process of a single round.

[0014] Furthermore, in step 1, if KL15 in the vehicle system is not powered on, indicating that the vehicle system is in a dormant state, mileage accumulation will not be performed.

[0015] Furthermore, in step 2, whenever KL15 in the vehicle system is powered on, the measurement and analysis module collects the maximum mileage values ​​in the Even area and Odd area in the vehicle system, and then combines the vehicle driving data to perform a new round of main function loop process, and executes it in a 10ms round manner.

[0016] Furthermore, in step three, the vehicle driving data includes a vehicle speed value and a message transmission time. If the vehicle speed value is within the standard speed range and the vehicle speed value message transmission time is shorter than the standard transmission time, it indicates that the vehicle speed value is highly effective and is organized into a speed data set. If the vehicle speed value exceeds the standard speed range and the vehicle speed value message transmission time is longer than the standard transmission time, it indicates that the vehicle speed value is less effective and mileage accumulation is not performed.

[0017] Furthermore, in step 3, the measurement and analysis module arranges the vehicle driving data with high validity from early to late in chronological order to form a speed data set. The speed data set is expressed as to The data correspond to the most effective vehicle driving data and the collected time points in each cycle. t represents the time when KL15 in the vehicle system has been powered on, s represents the speed of the vehicle, and the numbers 1 to n represent that there are n rounds of the main function loop process containing the most effective vehicle driving data.

[0018] Furthermore, the calculation formula of the subtotal mileage Xjd is as follows:

[0019]

[0020] In the formula, Xjd represents the subtotal mileage, Represents the speed value at the current time point in the driving dataset, Indicates the speed value of the previous round in the driving data set compared to the current time point, represents the sum of the two-wheel speed values, and tc represents the time difference between the two-wheel speed values. The subtotal mileage is calculated by multiplying the sum of the two wheel speeds by the time difference.

[0021] Furthermore, in step 4, if the sub-mileage Xjd is greater than or equal to 0.1 km, the measurement and analysis module adds the sub-mileage Xjd to the total mileage Zjd; if the sub-mileage Xjd is less than 0.1 km, the sub-mileage Xjd is not added to the total mileage Zjd.

[0022] Furthermore, the total mileage Zjd calculation process is as follows:

[0023] Zjd=∑ gt (Xjd 1 +Xjd 2 +Xjd 3 +...+Xjd n ), Xjd ∞ ≥0.1

[0024] In the formula, Zjd represents the total mileage, gt represents the fixed parameter that limits the cumulative time interval in the total mileage calculation formula, ∑ gt (Xjd 1 +Xjd 2 +Xjd 3 +...+Xjd n ) means that within the fixed parameter duration, the subtotal mileage Xjd greater than or equal to 0.1km in each main function cycle is accumulated in chronological order from early to late, and the total mileage, Xjd∞ ≥0.1 means that all subtotal mileage Xjd involved in the accumulation are greater than or equal to 0.1km.

[0025] Furthermore, in step five, if the total mileage Zjd is greater than or equal to 1 km, the total mileage Zjd is valid data, and is accumulated with the maximum mileage in the main function loop process data of the previous round to generate the final total mileage Zjd. If the subtotal mileage Xjd is less than 1 km, the total mileage Zjd is invalid data.

[0026] Furthermore, in step six, if the final total mileage Zjd is an odd number, the measurement and analysis module records the final total mileage Zjd to the Even area in the vehicle system; if the final total mileage Zjd is an even number, the measurement and analysis module records the final total mileage Zjd to the Odd area in the vehicle system.

[0027] Compared with the prior art, the present invention provides a mileage measurement method for automobile wear and tear assessment, which has the following beneficial effects:

[0028] 1. The present invention is interconnected with the vehicle system through the network through the data acquisition module to collect vehicle driving data and determine the corresponding mileage measurement method. If the KL15 in the vehicle system has been powered on, the data acquisition module transmits the vehicle driving data to the measurement and analysis module. Whenever the KL15 in the vehicle system has been powered on, the measurement and analysis module connects to the Even area and Odd area in the vehicle system through the network to collect the main function cycle process data of the previous round, and performs a new round of main function cycle process based on the vehicle driving data and the main function cycle process data of the previous round. The main function will be called in a loop and will be called in 10ms. The system is executed in a round-robin manner. Before each cycle, the subtotal mileage Xjd is first initialized to zero, and all variables that may affect the final total mileage Zjd are cleared. The measurement and analysis module determines the validity of the vehicle driving data. If the vehicle driving data does not exceed the standard transmission time and standard speed range, it means that the vehicle driving data is highly valid and is organized into a speed data set. The measurement and analysis module calculates the subtotal mileage Xjd and total mileage Zjd based on the driving data set and makes two judgments on whether to continue accumulation. This measures the mileage value of the vehicle in driving state with high precision, and the mileage accumulation measurement accuracy is higher.

[0029] 2. The present invention collects the maximum mileage values ​​in the Even and Odd areas of the vehicle-mounted system through the measurement and analysis module to avoid the occurrence of total mileage jumps caused by write or read failures. The mileage data of at least one of the backup data in the Even and Odd areas is valid, and then a new round of main function loop process is performed in combination with the vehicle driving data. If the total mileage Zjd is greater than or equal to 1km, the total mileage Zjd is valid data and is accumulated with the maximum mileage value in the data of the previous round of main function loop process to generate the final total mileage Zjd. The measurement and analysis module performs a parity check based on the final total mileage Zjd and records it accordingly in the Even or Odd area of ​​the vehicle-mounted system to complete a single round of the main function loop process. The dual recording and storage of backup mileage data is not easily lost, and the loss assessment is more realistic and accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a step diagram of the method of the present invention. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] Because traditional vehicle mileage measurement methods rely on a single data source, they are prone to problems such as total mileage jumps, which leads to problems such as unreliable total mileage. The cumulative measurement accuracy is low and cannot intuitively reflect the degree of vehicle wear and tear, which greatly affects the price evaluation of secondary sales. Therefore, a mileage measurement method for vehicle wear and tear evaluation is proposed. Please refer to Figure 1 , including a vehicle computer system, the vehicle computer system is used to provide vehicle driving data, and the vehicle computer system is provided with a CAN bus, a VCU module, an Eem module, an Even area, and an Odd area. The VCU module provides vehicle driving data, the CAN bus performs data transmission, the Eem module is an engine control module, responsible for monitoring the ignition signal KL15 when the engine is running, and the Even area and the Odd area record mileage data. The mileage measurement method for automobile loss evaluation is implemented by the mileage measurement system for automobile loss evaluation. The mileage measurement system for automobile loss evaluation includes a data acquisition module and a measurement and analysis module. The mileage measurement method for automobile loss evaluation includes the following steps:

[0033] Step 1: After the data acquisition module is connected to the vehicle system through the network, it collects vehicle driving data and determines the corresponding mileage measurement method. If the KL15 in the vehicle system is powered on, it means that the vehicle system is in operation. The data acquisition module transmits the vehicle driving data to the measurement and analysis module and starts mileage accumulation. If the KL15 in the vehicle system is not powered on, it means that the vehicle system is in sleep mode and mileage accumulation is not performed.

[0034] Step 2: Whenever KL15 in the vehicle system is powered on, the measurement and analysis module collects the maximum mileage values ​​in the Even area and Odd area in the vehicle system to avoid the occurrence of total mileage jumps caused by write or read failures. The mileage data of at least one area in the backup data of the Even area and the Odd area is valid. Then, a new round of main function loop process is performed in combination with the vehicle driving data. During the process of KL15 being powered on and running in the vehicle system, the main function will be called in a loop and executed in a cycle of 10ms. Before each cycle, the subtotal mileage Xjd is first initialized to zero, and all variables that may affect the final total mileage Zjd are cleared;

[0035] Step 3. The measurement and analysis module is provided with a standard transmission time and a standard speed interval, and the validity of the vehicle driving data is judged according to the standard transmission time and the standard speed interval. The standard transmission time is specifically the slowest time for the speed data sent by the VCU module to be transmitted to the CAN bus for data transmission. The standard speed interval is specifically the rated speed interval of the vehicle. The vehicle driving data includes the vehicle speed value and the message transmission time. If the vehicle speed value is included in the standard speed interval and the vehicle speed value message transmission time is shorter than the standard transmission time, it is quickly judged that the vehicle speed data message is the latest and there is no delay or loss. The current speed information is true, reliable and timely, indicating that the vehicle speed value is highly valid. It is sorted into a speed data set. The measurement and analysis module arranges the vehicle driving data with high validity from early to late in chronological order to form a speed data set. The expression of the speed data set is: to The data corresponding to the most effective vehicle driving data and the time point of collection in each cycle are sequentially displayed. t represents the time point when KL15 in the vehicle system has been powered on, s represents the speed of the vehicle, and the numbers 1 to n represent the number of main function loops containing the most effective vehicle driving data.

[0036] If the vehicle speed exceeds the standard speed range and the vehicle speed message transmission time is longer than the standard transmission time, it is quickly determined that the vehicle speed data message is not the latest and a delay or loss occurred during the transmission process, indicating that the vehicle speed value is not valid. In this case, mileage accumulation will not be performed and the cycle process of this round will be ended directly.

[0037] Step 4: The measurement and analysis module calculates and generates the subtotal mileage Xjd based on the driving data set, and determines whether to continue accumulation based on the subtotal mileage Xjd. The calculation formula is as follows:

[0038]

[0039] In the formula, Xjd represents the subtotal mileage, Represents the speed value at the current time point in the driving dataset, Indicates the speed value of the previous round in the driving data set compared to the current time point, represents the sum of the two-wheel speed values, and tc represents the time difference between the two-wheel speed values. The sub-mileage is calculated by multiplying the sum of the two wheel speed values ​​by the time difference, and measures the mileage value of the vehicle in driving state with high precision;

[0040] If the subtotal mileage Xjd is greater than or equal to 0.1km, the measurement and analysis module will add the subtotal mileage Xjd to the total mileage Zjd. The driving distance is long, and there is a certain amount of car wear and tear. If the subtotal mileage Xjd is less than 0.1km, the subtotal mileage Xjd is not added to the total mileage Zjd. The driving distance is negligible, and there is no car wear and tear.

[0041] Step 5: The measurement and analysis module generates the total mileage Zjd based on the accumulated subtotal mileage Xjd, and determines whether to continue accumulating based on the total mileage Zjd. The calculation formula is as follows:

[0042] Zjd=∑ gt (Xjd 1 +Xjd 2 +Xjd 3 +...+Xjd n ), Xjd ∞ ≥0.1

[0043] In the formula, Zjd represents the total mileage, gt represents the fixed parameter that limits the cumulative time interval in the total mileage calculation formula, ∑ gt (Xjd 1 +Xjd 2 +Xjd 3 +...+Xjd n ) means that within the fixed parameter duration, the subtotal mileage Xjd greater than or equal to 0.1km in each main function cycle is accumulated in chronological order from early to late, and the total mileage, Xjd ∞ ≥0.1 means that all subtotal mileage Xjd involved in the accumulation are greater than or equal to 0.1km, and the mileage accumulation measurement accuracy is higher;

[0044] If the total mileage Zjd is greater than or equal to 1km, the total mileage Zjd is valid data and is accumulated with the maximum mileage in the main function loop process data of the previous round to generate the final total mileage Zjd. If the subtotal mileage Xjd is less than 1km, the total mileage Zjd is invalid data;

[0045] Step 6: The measurement and analysis module performs a parity check based on the final total mileage Zjd and records it in the Even area or Odd area of ​​the vehicle system, completing the main function loop process of a single round;

[0046] If the final total mileage Zjd is an odd number, the measurement and analysis module will record the final total mileage Zjd to the Even area in the vehicle system. If the final total mileage Zjd is an even number, the measurement and analysis module will record the final total mileage Zjd to the Odd area in the vehicle system. The double recording and storage of backup mileage data is not easily lost, and the loss assessment is more real and accurate.

[0047] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A mileage measurement method for automobile wear and tear assessment, comprising a vehicle computer system for providing vehicle driving data, characterized in that: The mileage measurement method for automobile loss assessment is implemented by a mileage measurement system for automobile loss assessment, wherein the mileage measurement system for automobile loss assessment includes a data acquisition module and a measurement and analysis module. The mileage measurement method for automobile loss assessment includes: Step 1: After the data acquisition module is connected to the vehicle system through the network, it collects vehicle driving data and determines the corresponding mileage measurement method. If the KL15 in the vehicle system is powered on, the data acquisition module transmits the vehicle driving data to the measurement and analysis module; Step 2: Whenever KL15 in the vehicle system is powered on, the measurement and analysis module connects to the Even area and Odd area in the vehicle system through the network to collect the data of the previous round of main function cycle process, and performs a new round of main function cycle process based on the vehicle driving data and the data of the previous round of main function cycle process; Step 3: The measurement and analysis module is set with a standard transmission time and a standard speed range, and determines the validity of the vehicle driving data based on the standard transmission time and the standard speed range. If the vehicle driving data does not exceed the standard transmission time and the standard speed range, it means that the vehicle driving data is highly valid, and the data is organized into a speed data set; Step 4: The measurement and analysis module calculates and generates a subtotal mileage Xjd based on the driving data set, and determines whether to continue accumulation based on the subtotal mileage Xjd; Step 5: The measurement and analysis module generates the total mileage Zjd based on the accumulated subtotal mileage Xjd, and determines whether to continue accumulating based on the total mileage Zjd; Step 6: The measurement and analysis module performs parity check based on the final total mileage Zjd, and records it accordingly in the Even area or Odd area in the vehicle system, completing the main function loop process of a single round.

2. The mileage measurement method for automobile wear and tear assessment according to claim 1, characterized in that: In the step 1, if the KL15 in the vehicle system is not powered on, it means that the vehicle system is in a dormant state, and the mileage will not be accumulated.

3. The mileage measurement method for automobile wear and tear assessment according to claim 2, characterized in that: In step 2, whenever KL15 in the vehicle system is powered on, the measurement and analysis module collects the maximum mileage values ​​in the Even area and Odd area in the vehicle system, and then combines the vehicle driving data to perform a new round of main function loop process, and executes it in a 10ms round manner.

4. The mileage measurement method for automobile wear and tear assessment according to claim 3, characterized in that: In step three, the vehicle driving data includes the vehicle speed value and the message transmission time. If the vehicle speed value is included in the standard speed range and the vehicle speed value message transmission time is shorter than the standard transmission time, it indicates that the vehicle speed value is highly effective and is compiled into a speed data set. If the vehicle speed value exceeds the standard speed range and the vehicle speed value message transmission time is longer than the standard transmission time, it indicates that the vehicle speed value is less effective and mileage accumulation is not performed.

5. The mileage measurement method for automobile loss assessment according to claim 4, characterized in that: In step 3, the measurement and analysis module arranges the vehicle driving data with high validity from early to late in chronological order to form a speed data set. The speed data set is expressed as to The data correspond to the most effective vehicle driving data and the collected time points in each cycle. t represents the time when KL15 in the vehicle system has been powered on, s represents the speed of the vehicle, and the numbers 1 to n represent that there are n rounds of the main function loop process containing the most effective vehicle driving data.

6. The mileage measurement method for automobile wear and tear assessment according to claim 5, characterized in that: The calculation formula of the subtotal mileage Xjd is as follows: In the formula, Xjd represents the subtotal mileage, Represents the speed value at the current time point in the driving dataset, Indicates the speed value of the previous round in the driving data set compared to the current time point, represents the sum of the two-wheel speed values, and tc represents the time difference between the two-wheel speed values. The subtotal mileage is calculated by multiplying the sum of the two wheel speeds by the time difference.

7. The mileage measurement method for automobile loss assessment according to claim 6, characterized in that: In step 4, if the subtotal mileage Xjd is greater than or equal to 0.1 km, the measurement and analysis module adds the subtotal mileage Xjd to the total mileage Zjd; if the subtotal mileage Xjd is less than 0.1 km, the subtotal mileage Xjd is not added to the total mileage Zjd.

8. The mileage measurement method for automobile loss assessment according to claim 7, characterized in that: The total mileage Zjd calculation process is as follows: Zjd=∑ gt (Xjd 1 +Xjd 2 +Xjd 3 +...+Xjd n ),Xjd ∞ ≥0.1 In the formula, Zjd represents the total mileage, gt represents the fixed parameter that limits the cumulative time interval in the total mileage calculation formula, ∑ gt (Xjd 1 +Xjd 2 +Xjd 3 +...+Xjd n ) means that within the fixed parameter duration, the subtotal mileage Xjd greater than or equal to 0.1km in each main function cycle is accumulated in chronological order from early to late, and the total mileage, Xjd ∞ ≥0.1 means that all subtotal mileage Xjd involved in the accumulation are greater than or equal to 0.1km.

9. The mileage measurement method for automobile wear and tear assessment according to claim 8, characterized in that: In step five, if the total mileage Zjd is greater than or equal to 1 km, the total mileage Zjd is valid data, and is accumulated with the maximum mileage in the main function loop process data of the previous round to generate the final total mileage Zjd. If the subtotal mileage Xjd is less than 1 km, the total mileage Zjd is invalid data.

10. The mileage measurement method for automobile loss assessment according to claim 9, characterized in that: In step six, if the final total mileage Zjd is an odd number, the measurement and analysis module records the final total mileage Zjd to the Even area in the vehicle system; if the final total mileage Zjd is an even number, the measurement and analysis module records the final total mileage Zjd to the Odd area in the vehicle system.

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