Vehicle performance detection method, detection system and storage medium

Abstract

The invention provides a vehicle performance detection method and system and a storage medium. The method comprises the following steps: executing a timing operation through a first terminal installed on a vehicle during a performance test item of the vehicle; shooting speed information displayed by an instrument of the vehicle and timing information of the first terminal through a second terminal installed on the vehicle during a performance test item of the vehicle to obtain video data; based on the speed information and the timing information recorded in the video data, the detection result of the performance test item of the vehicle is determined, and the detection result comprises at least one of the time consumption, the acceleration and the maximum speed of the vehicle completing the performance test item. Therefore, the problems of low efficiency, high cost and difficult operation of the vehicle power performance test can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of vehicle testing, and in particular to a vehicle performance testing method, a testing system and a storage medium. Background Art

[0002] As competition in the vehicle industry becomes increasingly fierce, the vehicle development cycle continues to shorten and the development cost continues to decrease. At present, vehicle dynamic performance test (such as vehicle acceleration performance test) is usually implemented using special test equipment and special data processing and analysis software system. Test equipment and test software are relatively expensive, and test equipment involves multiple links such as procurement, installation, commissioning and calibration, disassembly, storage, repair and maintenance, mechanism detection and calibration, and transportation, which makes the use of test equipment more complicated and requires professionals with long-term operation experience to implement; the collection and analysis of test data also requires professionals with long-term operation experience to handle and implement. That is, the current vehicle dynamic performance test has a low detection method with high efficiency, high cost, and difficult implementation. Summary of the invention

[0003] In view of this, the purpose of the embodiments of the present application is to provide a vehicle performance detection method, a detection system and a storage medium, which can improve the problems of low efficiency, high cost and difficult operation of vehicle dynamic performance testing.

[0004] In order to achieve the above technical objectives, the technical solutions adopted in this application are as follows:

[0005] In a first aspect, an embodiment of the present application provides a vehicle performance detection method, the method comprising:

[0006] By means of a first terminal installed on a vehicle, a timing operation is performed during a performance test item of the vehicle;

[0007] By means of a second terminal installed on the vehicle, during the performance test item of the vehicle, speed information displayed on the instrument panel of the vehicle and timing information of the first terminal are photographed to obtain video data;

[0008] Based on the speed information and timing information recorded in the video data, a test result of the vehicle performing the performance test item is determined, and the test result includes at least one of the time taken for the vehicle to complete the performance test item, the acceleration, and the maximum vehicle speed.

[0009] In conjunction with the first aspect, in some optional implementations, before performing a timing operation by a first terminal installed on a vehicle during a performance test item of the vehicle, the method further includes:

[0010] Install and debug the first terminal, and / or the second terminal, and / or the speed meter;

[0011] Based on the first terminal, and / or the second terminal, and / or the speed meter, sensing the uniform speed of the vehicle as the sensed vehicle speed;

[0012] Based on the sensed vehicle speed, speed information displayed on an instrument panel of the vehicle is calibrated.

[0013] In conjunction with the first aspect, in some optional implementations, installing and debugging the first terminal, and / or the second terminal, and / or the speed meter includes:

[0014] The first terminal is installed in the cabin of the vehicle by means of a first installation bracket, and the operation interface of the timing function module of the first terminal is used as the working interface of the first terminal;

[0015] and / or, the second terminal is installed in the cabin of the vehicle through a second installation bracket, and the video image of the camera of the second terminal includes the speed information displayed on the instrument panel of the vehicle and the working interface of the first terminal, and the video frame rate of the second terminal is greater than or equal to the specified frame rate;

[0016] And / or, the speed meter is installed on the vehicle via a third installation bracket.

[0017] In combination with the first aspect, in some optional implementations, sensing the speed of the vehicle traveling at a constant speed as the sensed vehicle speed includes:

[0018] De-noising all speed data obtained by sensing the vehicle traveling at a constant speed;

[0019] The speed data after denoising is averaged to obtain the average speed as the sensed vehicle speed.

[0020] In combination with the first aspect, in some optional implementations, based on the sensed vehicle speed, calibrating the speed information displayed on the instrument panel of the vehicle includes:

[0021] When the difference between the sensed vehicle speed and the speed displayed by the instrument is not within a preset difference range that indicates a qualified speed, the sensed vehicle speed is used as the speed displayed by the instrument to calibrate the instrument.

[0022] In combination with the first aspect, in some optional implementations, determining the test result of the vehicle performing the performance test item based on the speed information and timing information recorded in the video data includes:

[0023] Determining from the video data a first time when the vehicle is at a starting speed during the performance test item, and determining a second time when the vehicle is at a stopping speed during the performance test item;

[0024] The detection result is obtained based on the first moment, the second moment, and the corresponding vehicle speed recorded in the video data.

[0025] In conjunction with the first aspect, in some optional implementations, determining, from the video data, a first moment when the vehicle is at a starting speed during the performance test item, and determining a second moment when the vehicle is at a terminating speed during the performance test item, comprises:

[0026] Slowing down the video data at a preset multiple, and extracting the last frame image in the video data indicating that the vehicle is at the starting speed during the performance test item as the first image; extracting the last frame image in the video data indicating that the vehicle is at the ending speed during the performance test item as the second image, wherein the preset multiple is greater than 0 and less than 1, and the frame rate of the video shot by the second terminal is greater than the preset frame rate;

[0027] The time of the first terminal displayed in the first image is determined as the first time, and the time of the first terminal displayed in the second image is determined as the second time.

[0028] In combination with the first aspect, in some optional implementations, obtaining the detection result based on the first moment, the second moment, and the corresponding vehicle speed recorded in the video data includes:

[0029] Inputting the first moment, the second moment, and the corresponding vehicle speed recorded in the video data into a table tool;

[0030] Through the function module in the table tool, the first moment, the second moment, and the corresponding vehicle speed recorded in the video data are calculated to obtain at least one of the time taken for the vehicle to complete the performance test item, the acceleration, and the maximum vehicle speed as the detection result.

[0031] In conjunction with the first aspect, in some optional implementations, the performance test items include at least one of the following:

[0032] detecting a maximum speed of the vehicle;

[0033] Detecting the time taken for the vehicle to accelerate from a stop state to a first specified speed;

[0034] Detecting the time taken for the vehicle to accelerate from the stopped state to the maximum vehicle speed;

[0035] detecting a time taken for the vehicle to accelerate from a second specified speed to a third specified speed;

[0036] Detecting the time taken for the vehicle to accelerate from the stopped state to a specified distance;

[0037] A maximum vehicle speed during a period in which the vehicle accelerates from the stopped state to the designated distance is detected.

[0038] In conjunction with the first aspect, in some optional implementations, the first terminal includes a timer, or a mobile phone with a timing function;

[0039] The second terminal includes a camera, or a mobile phone with a video recording function.

[0040] In a second aspect, an embodiment of the present application further provides a detection system, which includes a first terminal and a second terminal, wherein the first terminal and the second terminal both store a computer program, and when the computer program is executed by the first terminal and the second terminal, the first terminal and the second terminal cooperate to execute the aforementioned method.

[0041] In a third aspect, an embodiment of the present application further provides a computer-readable storage medium, wherein a computer program is stored in the computer-readable storage medium. When the computer program is executed on a computer, the computer executes the aforementioned method.

[0042] The invention adopting the above technical solution has the following advantages:

[0043] In the technical solution provided in the present application, during the performance test project of the vehicle, the first terminal is used for timing, and the second terminal is used to shoot the speed information displayed on the vehicle instrument and the timing information of the first terminal to obtain video data. Then, based on the speed information and timing information recorded in the video data, the parameters collected during the performance test project of the vehicle can be obtained, so as to obtain the test results of the vehicle performance test project. In this way, the dynamic performance test of the vehicle can be realized without the need for special test equipment and special data processing and analysis software system. In addition, the hardware cost of the first terminal with timing function and the second terminal with recording function is low, and the operation process of performance detection is simple. Therefore, this solution is conducive to improving the efficiency of vehicle performance detection, reducing detection costs, and simplifying the operation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] The present application may be further described by the non-limiting embodiments given in the accompanying drawings. It should be understood that the following drawings only illustrate certain embodiments of the present application and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings may be obtained based on these drawings without creative effort.

[0045] Figure 1 A schematic diagram of a process flow of a vehicle performance detection method provided in an embodiment of the present application.

[0046] Figure 2 A schematic diagram of a flow chart of a vehicle performance detection method provided in an embodiment of the present application.

[0047] Figure 3 An example of a table for calibrating the vehicle speed display provided in an embodiment of the present application.

[0048] Figure 4 An example of a table recording the file names of video data provided in an embodiment of the present application.

[0049] Figure 5 This is a table example of a quadratic equation solver provided in an embodiment of the present application.

[0050] Figure 6 This is an example of a table for automatic statistics of detection results provided in an embodiment of the present application. DETAILED DESCRIPTION

[0051] The present application will be described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that in the drawings or descriptions, similar or identical parts use the same figure numbers, and the implementation methods not shown or described in the drawings are forms known to ordinary technicians in the relevant technical field. In the description of this application, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0052] Please refer to Figure 1 The embodiment of the present application provides a vehicle performance detection method, which uses a first terminal and a second terminal to realize vehicle performance detection, simplify the operation process, reduce the detection cost, and improve detection efficiency. The first terminal can be, but is not limited to, a timer or a mobile phone with a timing function. The second terminal can be, but is not limited to, a camera or a mobile phone with a video recording function.

[0053] In this embodiment, the vehicle performance detection method may include the following steps:

[0054] Step 110, performing a timing operation during a performance test item of the vehicle by a first terminal installed on the vehicle;

[0055] Step 120, using a second terminal installed on the vehicle, during the performance test item of the vehicle, photographing the speed information displayed on the instrument of the vehicle and the timing information of the first terminal to obtain video data;

[0056] Step 130, based on the speed information and timing information recorded in the video data, determine the test result of the vehicle performing the performance test item, the test result including at least one of the time taken for the vehicle to complete the performance test item, acceleration, and maximum vehicle speed.

[0057] In this embodiment, the first terminal and the second terminal are both smart phones as an example, and the implementation process of the method will be described below by example, wherein the first terminal is a first mobile phone and the second terminal is a second mobile phone. The performance test items may include, but are not limited to, at least one of the following:

[0058] a. Detecting the maximum speed of the vehicle;

[0059] b. detecting the time taken for the vehicle to accelerate from a stopped state to a first specified speed;

[0060] c. Detecting the time taken for the vehicle to accelerate from a stopped state to a maximum speed;

[0061] d. detecting the time taken for the vehicle to accelerate from the second specified speed to the third specified speed;

[0062] e. Detecting the time taken for the vehicle to accelerate from the stopped state to a specified distance;

[0063] f. Detecting the maximum vehicle speed during the period when the vehicle accelerates from the stopped state to the designated distance.

[0064] In this embodiment, the stop state is a state where the vehicle speed is 0 kph (kph is a speed unit, equivalent to km / h, meaning kilometers per hour). The first designated speed can be flexibly set according to actual conditions, and the first designated speed can be, but not limited to, 60 km / h, 80 km / h, 100 km / h, 120 km / h, etc. The second designated speed is usually greater than 0 kph, and the third designated speed is greater than the second designated speed. The second designated speed and the third designated speed can be flexibly set in pairs. For example, when the second designated speed is 60 km / h, the third designated speed can be, but not limited to, 80 km / h, 100 km / h, 120 km / h.

[0065] In addition, the designated distance may be, but is not limited to, 100 m (m refers to the unit of length: meter), 200 m, 400 m, etc., and may be flexibly set according to actual conditions.

[0066] Performance test items may also include other items, such as testing the braking performance of the vehicle, for example, testing the braking time and braking distance from a specified speed until the vehicle stops.

[0067] In step 110, before executing the timing operation during the performance test item of the vehicle through the first terminal installed on the vehicle, the method may also include: preliminary preparation for vehicle testing, and installation and debugging process of the terminal.

[0068] The preliminary preparations for vehicle testing may include, but are not limited to, testing and checking the parameters of the power system, accelerator pedal, tire model / pressure, vehicle appearance, load, etc. of the vehicle to be tested. In addition, the length, width, longitudinal slope, transverse slope, adhesion coefficient, wind direction and speed of the road used by the test vehicle shall be determined according to the requirements or needs of the specific test items. For other conditions or requirements, please refer to "GB / T-12534 General Rules for Vehicle Road Test Methods".

[0069] Understandably, the items that need to be tested / calibrated in the preliminary preparation work can be determined according to the requirements or needs of the specific test items, so that the test environment can be set up for the vehicle performance test.

[0070] The installation and debugging process of the terminal may be as follows: Before step 110, the method may further include:

[0071] Install and debug the first terminal, and / or the second terminal, and / or the speed meter;

[0072] Based on the first terminal, and / or the second terminal, and / or the speed meter, sensing the uniform speed of the vehicle as the sensed vehicle speed;

[0073] Based on the sensed vehicle speed, speed information displayed on an instrument panel of the vehicle is calibrated.

[0074] In this embodiment, when the first terminal or the second terminal has a speed measuring function, there is no need to install and debug the speed measuring device. If the first terminal and the second terminal do not have a speed measuring function, the speed measuring device can be used to detect the driving speed of the vehicle.

[0075] In this embodiment, installing and debugging the first terminal, and / or the second terminal, and / or the speed meter may include:

[0076] The first terminal is installed in the cabin of the vehicle by means of a first installation bracket, and the operation interface of the timing function module of the first terminal is used as the working interface of the first terminal;

[0077] and / or, the second terminal is installed in the cockpit of the vehicle through a second mounting bracket, and the video image of the camera of the second terminal includes the speed information displayed on the instrument panel of the vehicle and the working interface of the first terminal, and the video frame rate of the second terminal is greater than or equal to a specified frame rate, and the specified frame rate can be flexibly set according to actual conditions, for example, 60fps;

[0078] And / or, the speed meter is installed on the vehicle via a third installation bracket.

[0079] The first mounting bracket and the second mounting bracket can both be mobile phone brackets. The third mounting bracket is a bracket adapted to the speed meter. The structure of each mounting bracket is not specifically limited here, as long as it can achieve the function of installation and fixing.

[0080] As an example, the process of installing and debugging the first terminal may include:

[0081] Prepare a set of universal extended arm vehicle suction cup mobile phone holders, firmly and stably install the suction cup of the mobile phone holder on the front windshield of the vehicle or other places, and ensure that the screen of the first mobile phone installed on the mobile phone holder can be clearly photographed by the second mobile phone in real time;

[0082] The stopwatch function module of the first mobile phone is adjusted to the working interface, and the operation interface of the stopwatch function module is clear and easy to operate;

[0083] The screen brightness of the first mobile phone is set to high brightness / clear, and the screen sleep is set to never sleep or sleep for ≥10 minutes;

[0084] The battery power of the first mobile phone is greater than 50% or can work continuously for greater than 60 minutes.

[0085] As an example, the process of installing and debugging the second terminal may be:

[0086] Prepare another set of universal extended arm type vehicle suction cup mobile phone holder, firmly and stably install the suction cup of the mobile phone holder on the front windshield, sunroof, driver's side window, or other places of the vehicle, to ensure that the second mobile phone installed on the mobile phone holder can clearly capture the vehicle speed meter (or the speed on the vehicle computer) and the screen of the first mobile phone in one picture;

[0087] The frame rate of the video shot by the camera of the second mobile phone supports video shooting of ≥60fps, and the frame rate of the video recorded by the camera of the second mobile phone is set to ≥60fps, ensuring that the available storage space of the second mobile phone is ≥5GB;

[0088] The second mobile phone is firmly and stably mounted on the mobile phone holder, and the angle and zoom of the video shot by the second mobile phone are adjusted / set to clearly capture the vehicle speed and the stopwatch function interface on the screen of the first mobile phone;

[0089] The screen sleep mode of the second mobile phone is set to never sleep or sleep for ≥10 minutes;

[0090] The battery level of the second mobile phone is >50% or can work continuously for >60 minutes.

[0091] The installation and debugging of the speedometer are similar to those of the first mobile phone, as long as the speedometer can be fixedly installed in the vehicle and the speed data displayed by the speedometer can be fully captured by the camera of the second mobile phone.

[0092] During the correction of the speed displayed on the vehicle instrument, the vehicle can be controlled to travel at a constant speed. For vehicles with a cruise control function, the cruise control function can be turned on to make the vehicle travel at a constant speed. Among them, the speed sensed by any device among the first terminal, the second terminal, and the speedometer is used as the sensed speed of the vehicle. If there are speeds sensed by multiple devices at the same time, the speeds can be averaged, and the average speed obtained is used as the sensed speed of the vehicle. Then, the sensed speed is compared and calibrated with the speed displayed on the vehicle instrument.

[0093] In this embodiment, sensing the speed of the vehicle traveling at a constant speed as the sensing vehicle speed may include:

[0094] De-noising all speed data obtained by sensing the vehicle traveling at a constant speed;

[0095] The speed data after denoising is averaged to obtain the average speed as the sensed vehicle speed.

[0096] In this embodiment, the denoising method may be to remove abnormal data from all speed data, for example, to remove speed data with large discreteness (for example, speed data that is too large or too small). Mean processing is to perform mean value calculation on the speed data after denoising.

[0097] In this embodiment, the step of calibrating the speed information displayed on the instrument panel of the vehicle based on the sensed vehicle speed may include:

[0098] When the difference between the sensed vehicle speed and the speed displayed by the instrument is not within a preset difference range that indicates a qualified speed, the sensed vehicle speed is used as the speed displayed by the instrument to calibrate the instrument.

[0099] The preset difference range can be flexibly determined according to the actual situation. For example, if: |V 感测 -V 仪表 |÷V 感测×100%>μ, it means that the difference between the sensed vehicle speed and the speed displayed by the instrument is large, and the vehicle speed of the instrument needs to be calibrated. 感测 Indicates the sensed vehicle speed, V 仪表 Refers to the speed displayed on the instrument, and μ refers to the preset difference range. For example, μ can be a smaller value such as 1%, 5%, etc. 感测 -V 仪表 |÷V 感测 ×100%≤μ, it means that the sensed vehicle speed is the same as or close to the speed displayed on the instrument. In this case, there is no need to calibrate the vehicle speed displayed on the instrument.

[0100] In this embodiment, the average value formula of the WPS table or Excel table can be used to automatically calculate the display floating value and the display floating coefficient. Display floating value = display speed - actual speed; display floating coefficient = display floating value / actual speed, where the display speed refers to the speed displayed on the vehicle's instrument; the actual speed refers to the aforementioned sensed speed. The display floating value and the display floating coefficient can be used to calibrate the speed displayed on the vehicle's instrument during the vehicle performance test.

[0101] In step 110 , an operator or a control program on the first terminal may trigger the first terminal to perform a timing operation during the performance test item of the vehicle.

[0102] In step 120, the operator or the control program on the second terminal may trigger the second terminal to capture the speed information displayed on the instrument panel of the vehicle and the timing information of the first terminal during the performance test of the vehicle.

[0103] In this embodiment, step 130 determines the test result of the vehicle performing the performance test item based on the speed information and timing information recorded in the video data, which may include:

[0104] Determining from the video data a first time when the vehicle is at a starting speed during the performance test item, and determining a second time when the vehicle is at a stopping speed during the performance test item;

[0105] The detection result is obtained based on the first moment, the second moment, and the corresponding vehicle speed recorded in the video data.

[0106] In this embodiment, the starting speed and the ending speed can be determined based on the content of the performance test item. For example, if the performance test item is the aforementioned "b. Detecting the time taken for the vehicle to accelerate from a stop state to a first specified speed", the starting speed is 0 kph and the ending speed is the first specified speed.

[0107] For another example, if the performance test item is the aforementioned "d. detecting the time taken for the vehicle to accelerate from the second specified speed to the third specified speed", the starting vehicle speed is the second specified speed, and the ending vehicle speed is the third specified speed.

[0108] In this embodiment, the step of determining from the video data a first moment when the vehicle is at a starting speed during the performance test item, and determining a second moment when the vehicle is at a terminating speed during the performance test item, may include:

[0109] Slowing down the video data at a preset multiple, and extracting the last frame image in the video data indicating that the vehicle is at the starting speed during the performance test item as the first image; extracting the last frame image in the video data indicating that the vehicle is at the ending speed during the performance test item as the second image, wherein the preset multiple is greater than 0 and less than 1, and the frame rate of the video shot by the second terminal is greater than the preset frame rate;

[0110] The time of the first terminal displayed in the first image is determined as the first time, and the time of the first terminal displayed in the second image is determined as the second time.

[0111] In this embodiment, the preset multiple can be flexibly determined according to actual conditions. For example, a 60fps video can be sped up to 0.05 times the playback speed (the duration of the original video becomes 20 times longer); a 120fps video can be sped up to 0.025 times the playback speed (the duration of the original video becomes 40 times longer). This makes it easier to quickly and accurately read the vehicle speed and stopwatch time in the video data.

[0112] In this embodiment, the step of obtaining the detection result based on the first moment, the second moment, and the corresponding vehicle speed recorded in the video data may include:

[0113] Inputting the first moment, the second moment, and the corresponding vehicle speed recorded in the video data into a table tool;

[0114] Through the function module in the table tool, the first moment, the second moment, and the corresponding vehicle speed recorded in the video data are calculated to obtain at least one of the time taken for the vehicle to complete the performance test item, the acceleration, and the maximum vehicle speed as the detection result.

[0115] The difference between the first moment and the second moment can be used as the time taken for the vehicle to complete the performance test project. The table tool can be, but is not limited to, an excel table software tool or a WPS table software tool. The function module in the table tool can be flexibly created according to the requirements of the performance test project.

[0116] In order to facilitate understanding of the implementation process of the vehicle performance test method, the operation of the method is described below with examples:

[0117] Please refer to Figure 2 In this embodiment, the operational process items of the performance test are respectively: ① confirmation of the state of the test vehicle (strategy to be tested), ② confirmation of the test road conditions, ③ installation and adjustment of the mobile phone holder, ④ installation and adjustment of the first mobile phone and the second mobile phone, ⑤ calibration of the vehicle display speed, ⑥ testing of the power acceleration performance, ⑦ test data entry and processing, ⑧ automatic processing of 0m to 400m test data, and ⑨ output of the vehicle power acceleration performance results.

[0118] Among them, ① confirmation of the test vehicle status, ② confirmation of the test road conditions, ③ installation and adjustment of the mobile phone holder, ④ installation and adjustment of the first mobile phone and the second mobile phone. The first four process items belong to the preparatory work before the test and shall be executed in accordance with the aforementioned "preliminary preparations for vehicle testing, and installation and debugging process of the terminal".

[0119] ⑤Vehicle speed display calibration, you can refer to Figure 3 The displayed speed refers to the speed displayed on the vehicle's instrument. Use the GPS of the navigation software of the test first mobile phone or the test second mobile phone to calibrate the speed display of the vehicle instrument or the vehicle computer. When the mobile phone GPS speed is 10kph, 20kph, 40kph, 60kph, 80kph, 100kph, 120kph, 140kph, 160kph, 180kph, and the maximum speed, the vehicle is driving steadily. Figure 3 The displayed speed value of the vehicle instrument or vehicle computer is recorded on the "(Table 1) Vehicle Display Speed ​​Calibration Table". For vehicles with cruise control function, the cruise control function can be turned on to calibrate the vehicle speed. The displayed speed is calibrated using the speed sensed by the mobile phone, that is, when the sensed speed of the first mobile phone or the second mobile phone is inconsistent with the displayed speed, the speed sensed by the mobile phone is used as the displayed speed of the vehicle.

[0120] In this embodiment, the average value formula of the WPS table can be used to automatically calculate the displayed floating value and the displayed floating coefficient. Among them, the displayed floating value = displayed vehicle speed - actual vehicle speed. In the WPS table, the displayed floating value can be directly obtained by setting the table formula, so the workload of the operator is relatively small.

[0121] In this embodiment, the display floating coefficient = the display floating value / the actual vehicle speed. For example, in the WPS table, setting the table formula can directly obtain the result of the display floating coefficient, so the workload of the operator is relatively small.

[0122] ⑥ The test of power acceleration performance can be combined with reference Figures 4 to 6For the test process of power acceleration performance, please refer to the following TS7 (TS7.1-TS7.7) steps. By testing the power acceleration performance of the vehicle, the video data file name during the test is recorded in Figure 4 In the "(Table 2) Test video data file record table" shown.

[0123] TS7, the test process of vehicle dynamic acceleration performance, including processes TS7.1-TS7.7, is as follows:

[0124] TS7.1: The vehicle to be tested is parked at the starting point of the test road, the vehicle is straightened and centered, the test driver fastens the seat belt and adjusts the seat and steering wheel to the appropriate position.

[0125] TS7.2: Vehicle settings. The vehicle energy mode (such as pure electric drive, hybrid drive, fuel drive, etc.) is set to the mode to be tested, the power mode (sport, normal, eco, etc.) is set to the mode to be tested, and the instrument or vehicle computer is set to an interface that is easy to observe and capture the vehicle speed.

[0126] TS7.3: Setting of the first mobile phone. The first mobile phone is set to the stopwatch working interface. Before each test, click the "Start" button of the stopwatch to start the stopwatch to count time.

[0127] TS7.4: Second phone settings. The second phone is set to the video recording interface. Before each test, click the "Start" button to start recording. Adjust the angle and zoom of the video recorded by the second phone to clearly capture the vehicle speed and the stopwatch of the first phone.

[0128] TS7.5: For test items where the initial vehicle speed (V0) is 0 km / h, after TS7.4 is completed, immediately accelerate the vehicle in a straight line at full throttle / full electric throttle from 0 km / h until the vehicle speed is greater than the end speed to be tested (V1)*105%, then quickly release the accelerator pedal, and then immediately brake to decelerate and stop quickly and steadily; for test items where the initial vehicle speed (V0) is not 0 km / h, after TS7.4 is completed, immediately accelerate the vehicle in a straight line to the initial vehicle speed (V0), hold the accelerator / electric throttle steady, and allow the vehicle to run steadily at a speed between "V0-2 km / h" and "V0-1 km / h" for about 3 seconds, then immediately accelerate the vehicle in a straight line at full throttle / full electric throttle until the vehicle speed is greater than the end speed to be tested (V1)*105%, then quickly release the accelerator pedal, and then immediately brake to decelerate and stop quickly and steadily. The vehicle speed in this step is the actual speed. The actual speed can be calibrated according to the displayed floating value and the displayed floating coefficient to obtain the actual speed. For example, the actual speed = displayed speed - displayed floating value.

[0129] TS7.6: After TS7.5 is completed, immediately click on the second phone to end the video shooting, and click on the first phone to end the stopwatch and return to zero. Then record the file name of the test video of the second phone.

[0130] TS7.7: Repeat TS7.1 to TS7.6 to complete all vehicle power acceleration performance test items (such as 0km / h ~ 100km / h acceleration time test, 0km / h-60km / h acceleration time test, 80km / h-120km / h acceleration time test, 0m-400m acceleration time test, maximum vehicle speed, etc.). Each vehicle power acceleration performance test item needs to repeat TS7.1 to TS7.6 and successfully complete ≥3 tests.

[0131] The raw data obtained from the test of process TS7 (TS7.1-TS7.7) can be collected and entered into the corresponding table file. The specific implementation method is as follows (step 1 to step 4).

[0132] Step 1: Test the slow-motion video processing (edit the video frame rate to 3fps). Use the "Video Speed ​​Change" function in the mobile phone video editing function to change the 120fps video to 0.025 times the playback speed (the original video length becomes 40 times longer). This makes it easier to quickly and accurately read the vehicle speed in the video and the corresponding stopwatch time.

[0133] Step 2, test the reading of stopwatch time. Read the stopwatch value displayed in the "last frame where the vehicle speed needs to be read" in the test video of the second mobile phone as the stopwatch time corresponding to the vehicle speed. For example, if you need to read the stopwatch time of the initial vehicle speed of 0km / h, read the stopwatch value of the last frame where the vehicle speed is equal to 0km / h in the video of the second mobile phone (the vehicle speed on the screen is 0km / h); for another example, if you need to read the stopwatch time of a vehicle speed of 60km / h, read the stopwatch value of the last frame where the vehicle speed is equal to 60km / h in the video of the second mobile phone (the vehicle speed on the screen is 60km / h).

[0134] Step 3: Record the acceleration time of the power acceleration performance test. Use WPS to make a table to record the stopwatch time of the test at speed points of 0km / h and integer multiples of 10km / h or 5km / h (the speed point density can be set as required according to test requirements). For example, make a table at speed points of integer multiples of 10km / h. Enter the data read in step 2 into the corresponding table.

[0135] Step 4: Process the data of the maximum speed. The data of the maximum speed can be non-integer. Fill in the actual maximum speed marked with non-integer in a table behind the same set of data. For example, if the actual maximum speed is 167kph, the stopwatch time of the actual maximum speed is 17.56 seconds, and the stopwatch time of 160kph is 16.31 seconds, then the corresponding data can be highlighted in the table.

[0136] In this embodiment, the initial vehicle speed time data is automatically reset to zero, which can be done by tabulating in a WPS table, filling in the time corresponding to all the initial speeds of the test as "0". The time of the speed point greater than the initial vehicle speed is calculated using the table function formula, which is the time of the speed point corresponding to the test item in the table minus the time of the initial vehicle speed. In this way, automatic calculation through the table is conducive to reducing the workload of users.

[0137] In this embodiment, the test data from 0m to 400m is automatically processed, and the specific process may be as follows (step 1 to step 5).

[0138] Step 1: Enter the three sets of acceleration time data obtained from the "zero to maximum vehicle speed (10S method)" test into the corresponding table.

[0139] Step 2: Zero to maximum vehicle speed (V max ) (10S method) average time calculation. The average value of the acceleration time of each speed point (3 groups) from "zero to maximum speed (10S method)" can be directly obtained through the table function formula. Among them, using the table function formula is helpful to reduce the user's calculation workload.

[0140] Step 3: Calculate the driving distance using the function of vehicle speed corresponding to time. Generate a scatter plot using the two sets of data obtained from the table calculation: "average value of acceleration time" and the corresponding "vehicle speed point value", and then derive the function of vehicle speed and time, such as the "y=2.6867x+2.4804" function. Further substitute the "y=2.6867x+2.4804" function into the time definite integral function formula Conclusion Definite integral function. Substitute the corresponding time array in the table into Function, using the table to automatically calculate the driving distance corresponding to each speed point.

[0141] Step 4: Accelerate the time equation. The driving distance S in the function is 400m, and the quadratic equation about time t is obtained as "(2.6867 / 2)t 2 +2.4804t-400=0".

[0142] Step 5: Use the quadratic equation (ax 2+bx+c=0) solver, automatically calculate the acceleration time (Tc) from zero to 400m. According to the "(2.6867 / 2)t 2 +2.4804t-400=0” Input the constants of the quadratic equation “a=1.34335, b=2.4804, c=-400” Figure 5 "(Table 4.2) quadratic equation (ax 2 + bx + c = 0) solver", automatically calculates the acceleration time (Tb = X1 = 16.35727695 seconds). If the calculated Tb ≤ Ta (Ta refers to the highest speed car (V max ) acceleration time), then the acceleration time from 0 to 400m is Tc=Tb=X1=16.35727695 seconds; if the calculated Tb>Ta, then use The function calculates the acceleration time (Tc) from 0 to 400m.

[0143] Please refer to Figure 5 , "A quadratic equation (ax 2 +bx+c=0) Solver”, uses the function formula “x=(-b±sqrt(b*b-4*a*c)) / (2*a)” to build the “(Table 4.2) quadratic equation (ax 2 +bx+c=0) solver".

[0144] Please refer to Figure 6 , use "(Table 5) Vehicle Power Acceleration Performance Test Results Automatic Statistics Table" (which can be tabulated through WPS tables). Clearly define the result items of each power acceleration performance test item. Figure 6 The vehicle dynamic acceleration performance test results shown in Table 5 are all automatically generated using table function formulas, without generating additional workload.

[0145] Based on the above design, the method provided in the embodiment of the present application can solve the problem that conventional equipment cannot be used to test the vehicle power acceleration performance and process data in a simple, efficient and accurate manner. This vehicle performance detection method can be completed by a general engineer after about 1 hour of learning, and can improve the efficiency and accuracy of vehicle power acceleration performance testing and data processing, improve the efficiency of vehicle power acceleration performance development and design, and reduce development costs.

[0146] An embodiment of the present application also provides a detection system, which may include a first terminal and a second terminal, wherein the first terminal and the second terminal both store a computer program, and when the computer program is executed by the first terminal and the second terminal, the first terminal and the second terminal cooperate to execute the steps of the aforementioned vehicle performance detection method.

[0147] It should be noted that those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working process of the detection system described above can refer to the corresponding process of each step in the aforementioned method, and will not be elaborated here.

[0148] The embodiment of the present application further provides a computer-readable storage medium. The computer-readable storage medium stores a computer program, and when the computer program is run on a computer, the computer executes the vehicle performance detection method described in the above embodiment.

[0149] Through the description of the above implementation methods, technical personnel in this field can clearly understand that the present application can be implemented by hardware, and can also be implemented by means of software plus a necessary general hardware platform. Based on such an understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.), including a number of instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each implementation scenario of the present application.

[0150] In the embodiments provided in the present application, it should be understood that the disclosed system and method can also be implemented in other ways. The system and method embodiments described above are merely schematic, for example, the flow charts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the systems, methods and computer program products according to the multiple embodiments of the present application. In this regard, each box in the flow chart or block diagram can represent a part of a module, a program segment or a code, and a part of the module, program segment or code includes one or more executable instructions for implementing the specified logical function. It should also be noted that each box in the block diagram and / or the flow chart, and the combination of the boxes in the block diagram and / or the flow chart can be implemented by a dedicated hardware-based system that performs the specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions. In addition, each functional module in each embodiment of the present application can be integrated together to form an independent part, or each module can exist separately, or two or more modules can be integrated to form an independent part.

[0151] The above description is only an embodiment of the present application and is not intended to limit the protection scope of the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A vehicle performance detection method, characterized in that: The method comprises: By means of a first terminal installed on a vehicle, a timing operation is performed during a performance test item of the vehicle; By means of a second terminal installed on the vehicle, during the performance test item of the vehicle, speed information displayed on the instrument panel of the vehicle and timing information of the first terminal are photographed to obtain video data; Based on the speed information and timing information recorded in the video data, a test result of the vehicle performing the performance test item is determined, and the test result includes at least one of the time taken for the vehicle to complete the performance test item, the acceleration, and the maximum vehicle speed.

2. The method according to claim 1, characterized in that Before performing a timing operation by the first terminal installed on the vehicle during the performance test item of the vehicle, the method further includes: Install and debug the first terminal, and / or the second terminal, and / or the speed meter; Based on the first terminal, and / or the second terminal, and / or the speed meter, sensing the uniform speed of the vehicle as the sensed vehicle speed; Based on the sensed vehicle speed, speed information displayed on an instrument panel of the vehicle is calibrated.

3. The method according to claim 2, characterized in that The installing and debugging of the first terminal, and / or the second terminal, and / or the speed meter includes: The first terminal is installed in the cabin of the vehicle by means of a first installation bracket, and the operation interface of the timing function module of the first terminal is used as the working interface of the first terminal; and / or, the second terminal is installed in the cabin of the vehicle through a second installation bracket, and the video image of the camera of the second terminal includes the speed information displayed on the instrument panel of the vehicle and the working interface of the first terminal, and the video frame rate of the second terminal is greater than or equal to the specified frame rate; And / or, the speed meter is installed on the vehicle via a third installation bracket.

4. The method according to claim 2, characterized in that: The sensing of the uniform speed of the vehicle as the sensing vehicle speed includes: De-noising all speed data obtained by sensing the vehicle traveling at a constant speed; The speed data after denoising is averaged to obtain the average speed as the sensed vehicle speed.

5. The method according to claim 2, characterized in that: The step of calibrating the speed information displayed on the instrument panel of the vehicle based on the sensed vehicle speed includes: When the difference between the sensed vehicle speed and the speed displayed by the instrument is not within a preset difference range that indicates a qualified speed, the sensed vehicle speed is used as the speed displayed by the instrument to calibrate the instrument.

6. The method according to claim 1, characterized in that The determining, based on the speed information and timing information recorded in the video data, a test result of the vehicle performing the performance test item includes: Determining from the video data a first time when the vehicle is at a starting speed during the performance test item, and determining a second time when the vehicle is at a stopping speed during the performance test item; The detection result is obtained based on the first moment, the second moment, and the corresponding vehicle speed recorded in the video data.

7. The method according to claim 6, characterized in that Determining from the video data a first moment when the vehicle is at a starting speed during the performance test item, and determining a second moment when the vehicle is at a terminating speed during the performance test item, comprises: Slowing down the video data at a preset multiple, and extracting the last frame image in the video data indicating that the vehicle is at the starting speed during the performance test item as the first image; extracting the last frame image in the video data indicating that the vehicle is at the ending speed during the performance test item as the second image, wherein the preset multiple is greater than 0 and less than 1, and the frame rate of the video shot by the second terminal is greater than the preset frame rate; The time of the first terminal displayed in the first image is determined as the first time, and the time of the first terminal displayed in the second image is determined as the second time.

8. The method according to claim 6, characterized in that The obtaining of the detection result based on the first moment, the second moment, and the corresponding vehicle speed recorded in the video data includes: Inputting the first moment, the second moment, and the corresponding vehicle speed recorded in the video data into a table tool; Through the function module in the table tool, the first moment, the second moment, and the corresponding vehicle speed recorded in the video data are calculated to obtain at least one of the time taken for the vehicle to complete the performance test item, the acceleration, and the maximum vehicle speed as the detection result.

9. The method according to any one of claims 1 to 8, characterized in that The performance test items include at least one of the following: detecting a maximum speed of the vehicle; detecting the time taken for the vehicle to accelerate from a stop state to a first specified speed; Detecting the time taken for the vehicle to accelerate from the stopped state to the maximum vehicle speed; detecting a time taken for the vehicle to accelerate from a second specified speed to a third specified speed; Detecting the time taken for the vehicle to accelerate from the stopped state to a specified distance; A maximum vehicle speed during a period in which the vehicle accelerates from the stopped state to the designated distance is detected.

10. The method according to any one of claims 1 to 8, characterized in that The first terminal includes a timer, or a mobile phone with a timing function; The second terminal includes a camera, or a mobile phone with a video recording function.

11. A detection system, characterized in that: The detection system includes a first terminal and a second terminal, wherein the first terminal and the second terminal both store a computer program, and when the computer program is executed by the first terminal and the second terminal, the first terminal and the second terminal cooperate to execute the method as described in any one of claims 1-10.

12. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed on a computer, the computer is enabled to execute the method according to any one of claims 1 to 10.

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