CN113066198A - Method and device for evaluating vehicle accelerating performance after uniform speed running - Google Patents
Method and device for evaluating vehicle accelerating performance after uniform speed running Download PDFInfo
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Abstract
The application discloses a method and a device for evaluating the reacceleration performance of vehicle running at constant speed, which relate to the technical field of automobile dynamic test, and the method for evaluating the reacceleration performance of vehicle running at constant speed comprises the following steps: acquiring original test data based on the identification instruction; after filtering the original test data, eliminating data corresponding to the moment when the opening percentage of the accelerator pedal is 0 to obtain a plurality of unconnected temporary data segments; after data segments with the duration less than the first duration in the plurality of temporary data segments are removed, intercepting data segments with stable accelerator opening from the remaining data segments to form a stable data segment group; and eliminating the data segments with the duration less than the second duration in the stable data segment group to obtain a final data segment group, forming an acceleration gain-vehicle speed relation curve according to the final data segment group, and evaluating the accelerated dynamics of the vehicle after the vehicle runs at a constant speed. The method and the device can intuitively and accurately evaluate the dynamics of accelerating the vehicle after the vehicle runs at a constant speed, and effectively improve the processing efficiency of the test data of the whole vehicle.
Description
Technical Field
The application relates to the technical field of automobile dynamic testing, in particular to a method and a device for evaluating the re-acceleration performance of a vehicle running at a constant speed.
Background
At present, in order to detect the reacceleration performance of a sample vehicle and a sample vehicle in a research and development stage, the reacceleration performance of a constant-speed driving accelerator of the sample vehicle and the sample vehicle needs to be tested, and test data obtained in the test needs to be processed so as to obtain a key index capable of reflecting the reacceleration performance of the constant-speed driving accelerator of the vehicle.
In the related technology, multiple tests are often required under the same working condition of the same vehicle type, but only the data meeting the requirements are often selected to be used as the re-acceleration performance evaluation of the constant-speed running accelerator of the vehicle. When selecting data, an engineer is required to sequentially select, import and retrieve the data, and key indexes obtained after retrieval are recorded by another carrier (such as paper pen) because of ubiquitous storage.
However, when the method is applied to processing of a large amount of data, the key indexes obtained through manual processing are filled in the excel table, that is, which data are needed to be evaluated, the corresponding variable names are selected, the data are pasted to the excel table, then the data in the excel table are manually arranged and typeset, and finally the data are pasted to a document to make an evaluation report, so that not only is the work task of an engineer complicated, but also the work efficiency is low due to work errors, and even the accuracy of accelerating performance evaluation of the accelerator for constant-speed driving of the vehicle is influenced.
Disclosure of Invention
Aiming at one of the defects in the prior art, the application aims to provide a method and a device for evaluating the accelerating performance of a vehicle after the vehicle runs at a constant speed, so as to solve the problems of low working efficiency and influence on the evaluation accuracy of the vehicle performance caused by working errors in the related technology.
The first aspect of the present application provides a method for evaluating the reacceleration performance of a vehicle running at a constant speed, comprising the steps of:
acquiring original test data based on the identification instruction; the original test data comprise the opening percentage of an accelerator pedal, the acceleration of the whole vehicle and the speed of the whole vehicle corresponding to a test time axis;
after filtering the original test data, eliminating data corresponding to the moment when the opening percentage of the accelerator pedal is 0 to obtain a plurality of unconnected temporary data segments;
after data segments with the duration less than the first duration in the plurality of temporary data segments are removed, intercepting data segments with stable accelerator opening from the remaining data segments to form a stable data segment group;
and eliminating the data segment with the duration less than the second duration in the stable data segment group to obtain a final data segment group, forming an acceleration gain-vehicle speed relation curve according to the final data segment group, and evaluating the accelerated dynamics of the vehicle after the vehicle runs at a constant speed.
In some embodiments, the intercepting the data segment with stable accelerator opening from the remaining data segments to form a stable data segment group specifically includes:
taking the residual data segment as an effective data segment;
in each effective data segment, taking a first time segment as a step length, and acquiring a data segment of a second time segment in each step, wherein the first time segment is smaller than the second time segment;
calculating the percentage variance of the opening degree of the accelerator pedal of the data section of each second time period, and acquiring a first data section and a last data section of which the variance is smaller than a variance threshold value;
intercepting a data segment between the initial data of the first data segment and the ending data of the last data segment in each effective data segment as a transition data segment;
and selecting effective data segments from the plurality of transition data segments as stable data segments to form a stable data segment group.
In some embodiments, the selecting an effective data segment from the plurality of transition data segments as the stable data segment specifically includes:
acquiring the maximum accelerator pedal opening percentage and the minimum accelerator pedal opening percentage of each transition data section;
when the difference value between the maximum accelerator pedal opening percentage and the minimum accelerator pedal opening percentage is smaller than an opening fluctuation threshold value, judging that the transition data section is effective and is used as a stable data section;
and when the difference value between the maximum accelerator pedal opening percentage and the minimum accelerator pedal opening percentage is larger than or equal to the opening fluctuation threshold value, judging that the transition data section is invalid.
In some embodiments, the filtering the original test data and removing data corresponding to the time when the percentage of the opening of the accelerator pedal is 0 to obtain a plurality of unconnected temporary data segments specifically includes:
performing Kalman filtering processing on the vehicle acceleration and the vehicle speed in the original test data to obtain filtered data;
and after the data corresponding to the moment when the opening percentage of the accelerator pedal is 0 is removed from the filtered data, a plurality of unconnected data sections are formed, wherein each data section is a temporary data section.
In some embodiments, before evaluating the vehicle constant speed driving and accelerating dynamics, the method further includes:
an optimal relation curve and a critical relation curve of the acceleration gain of the whole vehicle and the vehicle speed are preset.
In some embodiments, the evaluating the vehicle constant speed driving and then accelerating dynamic performance specifically includes:
comparing the position relation between the acceleration gain-vehicle speed relation curve and the optimal relation curve and the critical relation curve;
and if the acceleration gain-vehicle speed relation curve is positioned between the optimal relation curve and the critical relation curve, judging that the vehicle runs at a constant speed and then the acceleration dynamic property meets the requirement.
The second aspect of the present application provides a vehicle uniform velocity running reacceleration performance evaluation device, which includes:
the acquisition module is used for acquiring original test data based on the identification instruction; the original test data comprise the opening percentage of an accelerator pedal, the acceleration of the whole vehicle and the speed of the whole vehicle corresponding to a test time axis;
the data processing module is used for filtering the original test data, eliminating data corresponding to the moment when the opening percentage of the accelerator pedal is 0 to obtain a plurality of temporary data sections, and eliminating data sections with the duration less than the first duration from the plurality of temporary data sections to obtain data sections with stable opening of the accelerator pedal in the remaining data sections to form a stable data section group; the data segment group is also used for eliminating the data segments with the duration less than the second duration in the stable data segment group to obtain a final data segment group;
and the evaluation module is used for forming an acceleration gain-vehicle speed relation curve according to the final data segment group and evaluating the vehicle constant-speed running reacceleration dynamic property.
In some embodiments, the evaluation module is further configured to preset an optimal relationship curve and a critical relationship curve of the acceleration gain of the entire vehicle and the vehicle speed.
In some embodiments, the evaluation module is further configured to compare the acceleration gain-vehicle speed relationship curve with the optimal relationship curve and the critical relationship curve; and if the acceleration gain-vehicle speed relation curve is positioned between the optimal relation curve and the critical relation curve, judging that the vehicle runs at a constant speed and then the acceleration dynamic property meets the requirement.
In some embodiments, the data processing module:
the filtering submodule is used for carrying out filtering processing on the original test data to obtain filtered data;
the first processing submodule is used for eliminating data corresponding to the moment when the opening percentage of the accelerator pedal in the filtered data is 0 to obtain a plurality of temporary data sections;
the second processing submodule is used for removing the data sections with the duration less than the first duration from the plurality of temporary data sections, and acquiring the data sections with stable throttle opening in the rest data sections to form a stable data section group;
and the third processing submodule is used for eliminating the data segments with the duration less than the second duration in the stable segment group to obtain a final data segment group.
The beneficial effect that technical scheme that this application provided brought includes:
according to the method and the device for evaluating the accelerating performance of the vehicle during the constant-speed running, after the original test data is obtained based on the identification instruction, the original data is filtered, the data corresponding to the moment when the opening percentage of the accelerator pedal is 0 are removed, a plurality of unconnected temporary data sections are obtained, then the data sections with the duration less than the first duration in the plurality of temporary data sections are removed, the data sections with the stable accelerator opening are intercepted from the rest data sections to form a stable data section group, namely the data sections with the duration less than the second duration in the stable data section group are removed to obtain a final data section group, and an acceleration gain-vehicle speed relation curve is formed according to the final data section group, therefore, any group of data under the same working condition of the same vehicle type can be processed to obtain an acceleration gain-vehicle speed relation curve, and further according to the acceleration gain-vehicle speed relation curve, the method has the advantages that the dynamic property of the vehicle after running at a constant speed and accelerating is evaluated more intuitively and accurately, the repeated introduction and the complicated selection of multiple groups of data are avoided, and the processing efficiency of the test data of the whole vehicle is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a first flowchart of a method for evaluating vehicle re-acceleration performance during uniform-speed driving according to an embodiment of the present application;
FIG. 2 is an optimal relationship curve and a critical relationship curve of the acceleration gain of the whole vehicle and the vehicle speed in the embodiment of the application;
fig. 3 is a second flowchart of a method for evaluating vehicle reacceleration performance during uniform speed driving according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The embodiment of the application provides a method and a device for evaluating the accelerating performance of a vehicle after the vehicle runs at a constant speed, and can solve the problems that the work efficiency is low and the evaluation accuracy of the vehicle performance is influenced due to work errors in the related technology.
As shown in fig. 1, the method for evaluating the reacceleration performance of the vehicle during the uniform speed running according to the embodiment of the present application includes the following steps:
s1, acquiring original test data based on an identification instruction; the original test data comprise the opening percentage of the accelerator pedal, the acceleration of the whole vehicle and the speed of the whole vehicle corresponding to the test time axis.
And S2, filtering the original test data, and removing data corresponding to the moment when the opening percentage of the accelerator pedal is 0 to obtain a plurality of unconnected temporary data segments and form a temporary data segment group.
The test conditions are all completed under the condition of stepping on the accelerator pedal, so that the filtered data needs to be removed from the data with the accelerator pedal opening percentage of 0, namely the data with the accelerator pedal opening percentage of 0, the acceleration of the whole vehicle and the speed of the whole vehicle are removed.
And S3, after data sections with the duration less than the first duration in the plurality of temporary data sections are removed, intercepting the data sections with stable accelerator opening from the remaining data sections to form a stable data section group.
In this embodiment, since a complete test condition needs to be completed at least for a period of time, the temporary data segments smaller than the first duration in the temporary data segment group are removed to obtain an effective data segment group composed of the remaining data segments. The first time length is a set value and can be set according to the test requirement.
And S4, eliminating the data segment with the duration less than the second duration in the stable data segment group to obtain a final data segment group, calculating and outputting acceleration performance indexes of reacceleration of the vehicle at different speeds according to the final data segment group, forming an acceleration gain-vehicle speed relation curve, and evaluating the reacceleration dynamic property of the vehicle during constant-speed running. The reacceleration performance index mainly includes an acceleration gain and a corresponding vehicle speed.
And eliminating the stable data segments with the duration less than the second duration in the stable data segment group to obtain the final data segment group. The second time length is a set value and can be set according to the test requirement.
In the method for evaluating the re-acceleration performance of the uniform-speed running of the vehicle, after the original test data is obtained based on the identification instruction, the original data is filtered, the data corresponding to the moment when the percentage of the opening of the accelerator pedal is 0 are removed, a plurality of unconnected temporary data segments are obtained, the data segments with the duration less than the first duration in the plurality of temporary data segments are removed, the data segments with the stable accelerator opening are intercepted from the rest data segments to form a stable data segment group, namely the data segments with the duration less than the second duration in the stable data segment group are removed to obtain a final data segment group, and an acceleration gain-vehicle speed relation curve is formed according to the final data segment group, so that any group of data under the same working condition of the same vehicle type can be processed to obtain an acceleration gain-vehicle speed relation curve, and further according to the acceleration gain-vehicle speed relation curve, the method has the advantages that the dynamic property of the vehicle after running at a constant speed and accelerating is evaluated more intuitively and accurately, the repeated introduction and the complicated selection of multiple groups of data are avoided, and the processing efficiency of the test data of the whole vehicle is effectively improved.
In this embodiment, the identification instruction is a test data excel table input by a user, that is, a test instruction sent by a tester, and the identification instruction can identify at least a test time table header, an accelerator pedal opening percentage table header, a finished automobile acceleration table header and a finished automobile speed table header of the excel table, and then screen data acquired by a VBOX instrument in a vehicle test process, and convert the data into a file stored in a format such as excel or csv and import into data processing software (matlab), that is, original test data is obtained. Correspondingly, the original test data are test time data, accelerator pedal opening percentage data, finished automobile acceleration data and finished automobile speed data corresponding to the identification instruction. Alternatively, VBOX derives test data to excel with a time interval of 0.01s for each neighboring point, i.e., 0.01s for neighboring data along the time axis.
Preferably, in the step S3, the step of intercepting the data segment with stable accelerator opening from the remaining data segments to form a stable data segment group specifically includes the following steps:
firstly, the remaining data segments are used as valid data segments, and a plurality of valid data segments form a valid data segment group. In each effective data segment of the effective data segment group, a first time segment is taken as a step size, a data segment of a second time segment is obtained in each step, and the first time segment is smaller than the second time segment. The numerical values of the first time period and the second time period are set values and can be set according to actual needs.
Secondly, calculating the percentage variance of the opening degree of the accelerator pedal of the data section of each second time period, and acquiring a first data section and a last data section of which the variance is smaller than a variance threshold value.
And when the percentage variance of the accelerator pedal opening of the data segment in the second time period is smaller than the variance threshold, the accelerator opening of the data segment is stable. Optionally, the variance threshold is a set value that can be set according to actual requirements.
Then, a data segment between the start data of the first data segment to the end data of the last data segment in each effective data segment is intercepted as a transition data segment.
And finally, selecting an effective data section from the plurality of transitional data sections as a stable data section to form a stable data section group so as to obtain a data section with stable opening of the accelerator pedal under the test working condition in the evaluation process.
In this embodiment, the valid data segment group includes M valid data segments, that is, the valid data segment group includes valid data segment 1, valid data segment 2, valid data segment 3. Taking the valid data segment i (i ═ 1, 2, 3,. and M) as an example, it is assumed that the duration of the valid data segment i is 11 s.
When the data segment of 4s is obtained in each step by taking 0.5s as a step length, the data segment of 0-4s, the data segment of 0.5-4.5s, the data segment of 1-5s, the data segment of 1.5-5.5s, the data segment of 2-6s, the data segment of 2.5-6.5s, the data segment of 3-7s, the data segment of 3.5-7.5s, the data segment of 4-8s, the data segment of 4.5-8.5s, the data segment of 5-9s, the data segment of 5.5-9.5s, the data segment of 6-10s, the data segment of 6.5-10.5s and the data segment of 7-11s in the effective data segment i need to be obtained. And then, respectively calculating the percentage variance of the opening degree of the accelerator pedal of each data segment, and acquiring a plurality of data segments with the variance smaller than a variance threshold value.
Assuming that the first of the plurality of data segments is a data segment of 0.5-4.5s and the last is a data segment of 4.5-8.5s, the start data a (data at 0.5 s) of the data segment of 0.5-4.5s and the end data B (data at 8.5 s) of the data segment of 4.5-8.5s can be obtained. And finally intercepting the data segment between A and B in the effective data segment i as a transition data segment.
When 1s is taken as a step size, a data segment of 3s is acquired in each step, and then, data segments of 0-3s, data segments of 1-4s, and data segments of 2-5s, data segments of 4-7s, data segments of 5-8s, data segments of 6-9s, data segments of 7-10s, and data segments of 8-11s in the effective data segment i need to be acquired. And then, respectively calculating the percentage variance of the opening degree of the accelerator pedal of each data segment, and acquiring the data segment of which the variance is smaller than a variance threshold value.
Assuming that the data segment with the variance smaller than the variance threshold has only one data segment of 2-5s, the data segment is the first data segment and also the last data segment, and the first data C (data at 2 s) and the last data D (data at 5 s) of the data segment of 2-5s are intercepted, that is, the data segment between C and D in the valid data segment i is intercepted as the transition data segment.
In other embodiments, if there is no data segment in the valid data segment i in the second time segment with the variance smaller than the variance threshold, it indicates that the valid data segment i is not suitable for performance evaluation and needs to be discarded.
In this embodiment, the first time period may be further much smaller than the second time period, so as to increase the accuracy of data selection.
Further, the selecting an effective data segment from the plurality of transition data segments as a stable data segment specifically includes:
firstly, the maximum accelerator pedal opening percentage and the minimum accelerator pedal opening percentage of each transition data section are obtained, the maximum accelerator pedal opening percentage is defined as maxstepd, the minimum accelerator pedal opening percentage is defined as minstepd, and the difference value between the maximum accelerator pedal opening percentage and the minimum accelerator pedal opening percentage is calculated, namely maxstepd-minstepd.
And then, respectively judging whether the difference value of each transition data segment is smaller than the opening fluctuation threshold value of the stable accelerator. The opening fluctuation threshold is a set value set according to actual requirements.
And when the difference value between the maximum accelerator pedal opening percentage and the minimum accelerator pedal opening percentage is smaller than the opening fluctuation threshold value, judging that the transitional data section is effective and is used as a stable data section, and forming a stable data section group by a plurality of stable data sections.
And when the difference value between the maximum accelerator pedal opening percentage and the minimum accelerator pedal opening percentage is larger than or equal to the opening fluctuation threshold value, judging that the transition data section is invalid and abandoning the transition data section.
In this embodiment, in step S2, after filtering the original test data, data corresponding to the time when the percentage of opening of the accelerator pedal is 0 is removed, so as to obtain a plurality of unconnected temporary data segments, which specifically includes:
firstly, Kalman filtering processing is carried out on the acceleration of the whole vehicle and the speed of the whole vehicle in the original test data to obtain filtered data.
In the actual test process, the state quantity of the vehicle acceleration and the vehicle speed interference is a random quantity, and an accurate value cannot be measured, so that the measured acceleration and the measured vehicle speed need to be filtered.
And then, after the data corresponding to the moment when the opening percentage of the accelerator pedal is 0 is removed from the filtered data, a plurality of unconnected data sections are formed, each data section is a temporary data section, and a plurality of temporary data sections form a temporary data section group.
Wherein each temporary data segment represents a data segment having an accelerator pedal signal, and the percentage of accelerator pedal opening for each temporary data segment is increased from approximately 0 and then decreased to approximately 0%.
As shown in fig. 2, before evaluating the vehicle constant speed running reacceleration dynamics in step S4, the method further includes: and presetting an optimal relation curve and a critical relation curve of the acceleration gain of the whole vehicle and the vehicle speed as reference standards for subsequent evaluation. As shown in fig. 2, the upper line is a critical relationship curve (Low), and the lower line is an optimal relationship curve (High).
In this embodiment, in the step S4, the method for evaluating the vehicle constant speed driving and reacceleration dynamic property specifically includes the following steps:
firstly, outputting an acceleration gain-vehicle speed relation curve, the optimal relation curve and a critical relation curve in the same coordinate graph; and then, comparing the position relation between the acceleration gain-vehicle speed relation curve and the optimal relation curve and the critical relation curve.
And if the acceleration gain-vehicle speed relation curve is positioned between the optimal relation curve and the critical relation curve, judging that the vehicle runs at a constant speed and then the acceleration dynamic property meets the requirement.
In addition, if the acceleration gain-vehicle speed relation curve is closer to the optimal relation curve, the better the re-acceleration dynamic performance of the vehicle during the uniform-speed running is indicated; if the acceleration gain-vehicle speed relation curve is closer to the critical relation curve, the acceleration dynamics of the vehicle during constant-speed running is poorer.
As shown in fig. 3, the method for evaluating the reacceleration performance of the vehicle running at a constant speed in the embodiment specifically includes the following steps:
A1. acquiring original test data based on the identification instruction;
A2. filtering the original test data to obtain filtered data;
A3. eliminating data corresponding to the moment when the opening percentage of the accelerator pedal in the filtered data is 0 to obtain a plurality of unconnected temporary data segments;
A4. removing data segments with the duration less than 10s from the plurality of temporary data segments to obtain an effective data segment group;
A5. in each effective data segment of the effective data segment group, taking 0.5s as a step length, and acquiring 3s of data segments in each step;
A6. calculating percentage variance of the accelerator pedal opening degree of each 3s data segment, and respectively acquiring a first data segment and a last data segment of each effective data segment, wherein the variance is less than 0.3;
A7. intercepting a data segment between the start data of the first data segment and the end data of the last data segment in each effective data segment as a transition data segment;
A8. acquiring the difference value between the maximum accelerator pedal opening percentage and the minimum accelerator pedal opening percentage of each transition data section;
A9. acquiring all transition data sections with the difference value smaller than 2% to form a stable data section group;
A10. eliminating the data segments with the duration less than 8s in the stable data segment group to obtain a final data segment group;
A11. forming an acceleration gain-vehicle speed relation curve according to the final data segment group;
A12. setting an optimal relation curve and a critical relation curve of the acceleration gain of the whole vehicle and the vehicle speed;
A13. and comparing the position relationship between the acceleration gain-vehicle speed relationship curve and the optimal relationship curve and the critical relationship curve, and evaluating the accelerated dynamics of the vehicle after the vehicle runs at a constant speed.
The device for evaluating the vehicle accelerating performance after the vehicle runs at the constant speed comprises an acquisition module, a data processing module and an evaluation module.
The acquisition module is used for acquiring original test data based on the identification instruction; the original test data comprise the opening percentage of the accelerator pedal, the acceleration of the whole vehicle and the speed of the whole vehicle corresponding to the test time axis.
The data processing module is used for filtering the original test data, eliminating data corresponding to the moment when the opening percentage of the accelerator pedal is 0 to obtain a plurality of temporary data sections, and eliminating data sections with the duration less than the first duration from the plurality of temporary data sections to obtain data sections with stable opening of the accelerator pedal in the remaining data sections to form a stable data section group; and the data segment with the duration less than the second duration in the stable number segment group is removed to obtain a final data segment group.
And the evaluation module is used for forming an acceleration gain-vehicle speed relation curve according to the final data segment group and evaluating the vehicle constant-speed running re-acceleration dynamic property.
Furthermore, the evaluation module is further used for presetting an optimal relation curve and a critical relation curve of the acceleration gain of the whole vehicle and the vehicle speed.
In this embodiment, the evaluation module is further configured to compare the acceleration gain-vehicle speed relationship curve with the optimal relationship curve and the critical relationship curve; and if the acceleration gain-vehicle speed relation curve is positioned between the optimal relation curve and the critical relation curve, judging that the vehicle runs at a constant speed and then the acceleration dynamic property meets the requirement.
In this embodiment, the data processing module includes a filtering sub-module, a first processing sub-module, a second processing sub-module, and a third processing sub-module.
The filtering submodule is used for filtering the original test data to obtain filtered data.
The first processing submodule is used for eliminating data corresponding to the moment when the opening percentage of the accelerator pedal in the filtered data is 0 to obtain a plurality of temporary data sections.
The second processing submodule is used for removing the data segments with the duration less than the first duration from the plurality of temporary data segments, and acquiring the data segments with stable throttle opening in the remaining data segments to form a stable data segment group.
And the third processing submodule is used for eliminating the data segments with the duration less than the second duration in the stable segment group to obtain a final data segment group.
The device for evaluating the vehicle constant-speed running reacceleration performance is suitable for the performance evaluation methods, a group of test data is obtained through data processing and is used as a final data segment group to obtain an acceleration gain-vehicle speed relation curve, an automobile performance evaluation report is generated, and then the vehicle constant-speed running reacceleration dynamic performance is evaluated more intuitively and accurately.
The present invention is not limited to the above-described embodiments, and it will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the principle of the present invention, and such modifications and improvements are also considered to be within the scope of the present invention.
Claims (10)
1. A method for evaluating the re-acceleration performance of a vehicle running at a constant speed is characterized by comprising the following steps:
acquiring original test data based on the identification instruction; the original test data comprise the opening percentage of an accelerator pedal, the acceleration of the whole vehicle and the speed of the whole vehicle corresponding to the test time axis;
after filtering the original test data, eliminating data corresponding to the moment when the opening percentage of the accelerator pedal is 0 to obtain a plurality of unconnected temporary data segments;
after data segments with the duration less than the first duration in the plurality of temporary data segments are removed, intercepting data segments with stable accelerator opening from the remaining data segments to form a stable data segment group;
and eliminating the data segment with the duration less than the second duration in the stable data segment group to obtain a final data segment group, forming an acceleration gain-vehicle speed relation curve according to the final data segment group, and evaluating the accelerated dynamics of the vehicle after the vehicle runs at a constant speed.
2. The method for evaluating the reacceleration performance of the vehicle during the uniform speed running according to claim 1, wherein the step of intercepting the data segment with stable accelerator opening from the remaining data segments to form a stable data segment group comprises:
taking the residual data segment as an effective data segment;
in each effective data segment, taking a first time segment as a step length, and acquiring a data segment of a second time segment in each step, wherein the first time segment is smaller than the second time segment;
calculating the percentage variance of the opening degree of the accelerator pedal of the data section of each second time period, and acquiring a first data section and a last data section of which the variance is smaller than a variance threshold value;
intercepting a data segment between the initial data of the first data segment and the ending data of the last data segment in each effective data segment as a transition data segment;
and selecting effective data segments from the plurality of transition data segments as stable data segments to form a stable data segment group.
3. The method for evaluating the reacceleration performance of the vehicle during the uniform speed running according to claim 2, wherein the step of selecting the valid data segment from the plurality of transition data segments as the stable data segment specifically comprises:
acquiring the maximum accelerator pedal opening percentage and the minimum accelerator pedal opening percentage of each transition data section;
when the difference value between the maximum accelerator pedal opening percentage and the minimum accelerator pedal opening percentage is smaller than an opening fluctuation threshold value, judging that the transition data section is effective and is used as a stable data section;
and when the difference value between the maximum accelerator pedal opening percentage and the minimum accelerator pedal opening percentage is larger than or equal to an opening fluctuation threshold value, judging that the transition data section is invalid.
4. The method for evaluating the reacceleration performance of the vehicle during the uniform speed running according to claim 1, wherein the step of filtering the original test data and removing data corresponding to the moment when the percentage of the opening of the accelerator pedal is 0 to obtain a plurality of unconnected temporary data segments specifically comprises the steps of:
performing Kalman filtering processing on the vehicle acceleration and the vehicle speed in the original test data to obtain filtered data;
and after the data corresponding to the moment when the opening percentage of the accelerator pedal is 0 is removed from the filtered data, a plurality of unconnected data sections are formed, wherein each data section is a temporary data section.
5. The method for evaluating the reacceleration performance during the uniform velocity running of the vehicle according to claim 1, wherein before evaluating the reacceleration dynamics during the uniform velocity running of the vehicle, the method further comprises:
an optimal relation curve and a critical relation curve of the acceleration gain of the whole vehicle and the vehicle speed are preset.
6. The method for evaluating the reacceleration performance during the uniform speed running of the vehicle according to claim 5, wherein the evaluating the reacceleration dynamic performance during the uniform speed running of the vehicle specifically comprises:
comparing the acceleration gain-vehicle speed relation curve with the optimal relation curve and the critical relation curve;
and if the acceleration gain-vehicle speed relation curve is positioned between the optimal relation curve and the critical relation curve, judging that the vehicle runs at a constant speed and then the acceleration dynamic property meets the requirement.
7. A vehicle uniform velocity running reacceleration performance evaluation device is characterized by comprising:
the acquisition module is used for acquiring original test data based on the identification instruction; the original test data comprise the opening percentage of an accelerator pedal, the acceleration of the whole vehicle and the speed of the whole vehicle corresponding to the test time axis;
the data processing module is used for filtering the original test data, eliminating data corresponding to the moment when the opening percentage of the accelerator pedal is 0 to obtain a plurality of temporary data sections, and eliminating data sections with the duration less than the first duration from the plurality of temporary data sections to obtain data sections with stable opening of the accelerator pedal in the remaining data sections to form a stable data section group; the data segment group is also used for eliminating the data segments with the duration less than the second duration in the stable data segment group to obtain a final data segment group;
and the evaluation module is used for forming an acceleration gain-vehicle speed relation curve according to the final data segment group and evaluating the vehicle constant-speed running reacceleration dynamic property.
8. The vehicle uniform velocity running reacceleration performance evaluation device according to claim 7, wherein: the evaluation module is also used for presetting an optimal relation curve and a critical relation curve of the acceleration gain of the whole vehicle and the vehicle speed.
9. The vehicle uniform velocity running reacceleration performance evaluation device according to claim 8, wherein: the evaluation module is also used for comparing the acceleration gain-vehicle speed relation curve with the position relation between the optimal relation curve and the critical relation curve; and if the acceleration gain-vehicle speed relation curve is positioned between the optimal relation curve and the critical relation curve, judging that the vehicle runs at a constant speed and then the acceleration dynamic property meets the requirement.
10. The vehicle uniform velocity traveling reacceleration performance evaluation device according to claim 7, wherein the data processing module:
the filtering submodule is used for carrying out filtering processing on the original test data to obtain filtered data;
the first processing submodule is used for eliminating data corresponding to the moment when the opening percentage of the accelerator pedal in the filtered data is 0 to obtain a plurality of temporary data sections;
the second processing submodule is used for removing the data sections with the duration less than the first duration from the plurality of temporary data sections, and acquiring the data sections with stable throttle opening in the rest data sections to form a stable data section group;
and the third processing submodule is used for eliminating the data segments with the duration less than the second duration in the stable segment group to obtain a final data segment group.
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