CN113029587A - Automobile performance analysis method and system, storage medium and electronic equipment - Google Patents
Automobile performance analysis method and system, storage medium and electronic equipment Download PDFInfo
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Abstract
The invention discloses a method and a system for analyzing automobile performance, a storage medium and electronic equipment, wherein the method comprises the following steps: acquiring a performance analysis type to be tested, a testing mode and testing parameters; when the performance analysis type is acceleration dynamic, controlling the vehicle to be evaluated to start accelerating according to the test mode and the test parameters until the vehicle to be evaluated reaches a certain vehicle speed and drives at a constant speed; acquiring the peak acceleration of a vehicle to be evaluated in an acceleration process of accelerating the vehicle to a certain speed, and acquiring the acceleration dynamic property of the vehicle to be evaluated; and when the performance analysis type is the constant-speed driving dynamic property, controlling the vehicle to be evaluated to reach the target constant-speed and drive at the constant speed according to the test mode, collecting the travel of the constant-speed accelerator pedal in the constant-speed driving state, and acquiring the constant-speed driving dynamic property of the vehicle to be evaluated based on the target constant-speed. The invention identifies the performance category to be evaluated through the performance analysis type, and then executes the corresponding performance test according to the test parameters, so as to objectively evaluate the dynamic property of the vehicle.
Description
Technical Field
The invention relates to the field of automobile performance evaluation, in particular to an automobile performance analysis method, an automobile performance analysis system, a storage medium and electronic equipment.
Background
The dynamic property of a vehicle is an important index for evaluating the performance of the vehicle. On the one hand, the dynamic behavior is decisive for the level of the transport efficiency of the vehicle, and is therefore one of the most fundamental and important properties of the vehicle. On the other hand, the vehicle dynamic is of great importance to improving customer experience and improving vehicle type competitiveness.
In the industry, when objectively evaluating the vehicle dynamic performance, data of the limit dynamic performance which can be achieved by the vehicle when 100% of the opening degree of an accelerator pedal is generally adopted. However, in actual driving, the driver rarely depresses the 100% accelerator pedal, and therefore, there is no method for evaluating the power performance of the vehicle at the time of partial load corresponding to the partial accelerator pedal depression stroke.
Disclosure of Invention
The invention aims to overcome the defects of the background technology, and provides an automobile performance analysis method, an automobile performance analysis system, a storage medium and electronic equipment, wherein the automobile performance is evaluated based on partial load of an automobile instead of being evaluated by the limit dynamic property which can be achieved by the automobile when the accelerator pedal is opened by 100%, and the automobile performance analysis method can be more suitable for the actual driving condition of a driver, so that the daily actual driving feeling is well reflected.
In a first aspect, a method for analyzing automobile performance is provided, which includes the following steps:
acquiring a performance analysis type to be tested, a testing mode and testing parameters;
when the performance analysis type is detected to be the acceleration dynamic property, controlling the vehicle to be evaluated to start accelerating according to the test mode and the test parameters until the vehicle to be evaluated reaches a certain vehicle speed and drives at a constant speed;
acquiring the peak acceleration of the vehicle to be evaluated in the acceleration process of accelerating to the certain speed, and acquiring the acceleration dynamic property of the vehicle to be evaluated according to the test parameters and the peak acceleration;
when the performance analysis type is detected to be the constant-speed driving dynamic property, controlling the vehicle to be evaluated to reach a target constant-speed and drive at a constant speed according to the test mode, and collecting the constant-speed accelerator pedal stroke of the vehicle to be evaluated in a constant-speed driving state, wherein the test parameters comprise the target constant-speed;
and acquiring the constant-speed running dynamic performance of the vehicle to be evaluated based on the target constant-speed according to the travel of the constant-speed accelerator pedal.
According to the first aspect, in a first possible implementation manner of the first aspect, the step of controlling, when it is detected that the performance analysis type is acceleration dynamics, a vehicle to be evaluated to start acceleration until the vehicle to be evaluated reaches a certain vehicle speed and uniform speed includes:
the acceleration dynamic property comprises a starting acceleration dynamic property and a re-acceleration dynamic property;
when the performance analysis type is detected to be starting acceleration dynamic property, controlling a vehicle to be evaluated to start accelerating to a certain vehicle speed and run at a constant speed according to a starting accelerator pedal stroke from a standstill, wherein the test parameters comprise the starting accelerator pedal stroke;
when the performance analysis type is detected to be reacceleration acceleration dynamic property, controlling the vehicle to be evaluated to keep running at a reacceleration initial vehicle speed at a constant speed, wherein the test parameters comprise the reacceleration initial vehicle speed and an accelerator pedal travel increment;
and controlling the vehicle to be evaluated to accelerate according to the travel increment of the accelerator pedal until the vehicle to be evaluated reaches a certain vehicle speed and runs at a uniform speed.
According to a first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect, the step of "acquiring a peak acceleration of the vehicle to be evaluated in an acceleration process of accelerating to the certain vehicle speed, and acquiring an accelerated dynamic property of the vehicle to be evaluated according to the test parameter and the peak acceleration" includes the following steps:
acquiring all acceleration data of the vehicle to be evaluated in the acceleration process of accelerating to the certain speed;
selecting the maximum acceleration in all the acceleration data as the peak acceleration;
and acquiring the acceleration dynamic property of the vehicle to be evaluated according to the test parameters and the peak acceleration.
According to the first aspect, in a third possible implementation manner of the first aspect, the step of controlling the vehicle to be evaluated to reach a target constant speed and run at a constant speed according to the test manner when it is detected that the performance analysis type is the constant speed running dynamics, and acquiring a constant speed accelerator pedal stroke of the vehicle to be evaluated in a constant speed running state, where the test parameter includes the target constant speed includes the following steps:
when the performance analysis type is detected to be the constant-speed driving dynamics, controlling the vehicle to be evaluated to accelerate from a first preset vehicle speed to the target constant-speed vehicle speed, and controlling the vehicle to be evaluated to keep the target constant-speed vehicle speed to drive at a constant speed, or; controlling the vehicle to be evaluated to accelerate to a second preset vehicle speed, then decelerating to the target constant speed from the second preset vehicle speed, and running at a constant speed, wherein the test parameters comprise the target constant speed;
and acquiring the travel of a constant speed accelerator pedal of the vehicle to be evaluated in the constant speed running state of the target constant speed.
In a second aspect, there is provided an automobile performance analysis system, comprising:
the data acquisition module is used for acquiring the performance analysis type, the test mode and the test parameters to be tested;
the acceleration testing module is in communication connection with the data acquisition module and is used for controlling the vehicle to be evaluated to start accelerating according to the testing mode and the testing parameters when the performance analysis type is detected to be acceleration dynamic property until the vehicle to be evaluated reaches a certain vehicle speed and running at a constant speed;
the acceleration evaluation module is in communication connection with the acceleration test module and is used for acquiring the peak acceleration of the vehicle to be evaluated in the acceleration process of accelerating to the certain speed and acquiring the acceleration dynamic property of the vehicle to be evaluated according to the test parameters and the peak acceleration;
the constant-speed test module is in communication connection with the data acquisition module and is used for controlling the vehicle to be evaluated to reach a target constant-speed and run at a constant speed according to the test mode when the performance analysis type is detected to be the constant-speed running dynamic property, and collecting the constant-speed accelerator pedal stroke of the vehicle to be evaluated in a constant-speed running state, wherein the test parameters comprise the target constant-speed;
and the constant-speed evaluation module is in communication connection with the constant-speed test module and is used for acquiring the constant-speed running dynamic property of the vehicle to be evaluated based on the target constant-speed according to the travel of the constant-speed accelerator pedal.
According to a second aspect, in a first possible implementation manner of the second aspect, the accelerated test module includes:
the starting acceleration testing unit is used for controlling a vehicle to be evaluated to start accelerating to a certain vehicle speed and run at a constant speed according to a starting acceleration pedal stroke when the performance analysis type is detected to be starting acceleration dynamic, and the testing parameters comprise the starting acceleration pedal stroke; the acceleration dynamic property comprises a starting acceleration dynamic property and a re-acceleration dynamic property;
the system comprises a reacceleration acceleration testing unit, a performance analysis unit and a control unit, wherein the reacceleration acceleration testing unit is used for controlling a vehicle to be evaluated to keep running at a reacceleration initial speed at a constant speed when detecting that the performance analysis type is reacceleration acceleration dynamic property, and the testing parameters comprise the reacceleration initial speed and an accelerator pedal stroke increment; and controlling the vehicle to be evaluated to accelerate according to the travel increment of the accelerator pedal until the vehicle to be evaluated reaches a certain vehicle speed and runs at a uniform speed.
According to the first possible implementation manner of the second aspect, in a second possible implementation manner of the second aspect, the accelerated evaluation module includes:
the data acquisition unit is used for acquiring all acceleration data of the vehicle to be evaluated in the acceleration process of accelerating to the certain speed;
the data selection unit is in communication connection with the data acquisition unit and is used for selecting the maximum acceleration in all the acceleration data as the peak acceleration;
and the acceleration evaluation unit is in communication connection with the data selection unit and is used for acquiring the acceleration dynamic property of the vehicle to be evaluated according to the test parameters and the peak acceleration.
According to the second aspect, in a third possible implementation manner of the second aspect, the constant speed testing module includes:
the constant speed test unit is used for controlling the vehicle to be evaluated to accelerate from a first preset vehicle speed to the target constant speed when detecting that the performance analysis type is the constant speed driving dynamics, and controlling the vehicle to be evaluated to keep the target constant speed to drive at a constant speed, or; controlling the vehicle to be evaluated to accelerate to a second preset vehicle speed, then decelerating to the target constant speed from the second preset vehicle speed, and running at a constant speed, wherein the test parameters comprise the target constant speed;
and the stroke acquisition unit is in communication connection with the constant speed test unit and is used for acquiring the constant speed accelerator pedal stroke of the vehicle to be evaluated in the target constant speed running state at the constant speed.
In a third aspect, a storage medium is provided, on which a computer program is stored, wherein the computer program is executed by a processor to implement the method for testing the solid state disk code.
In a fourth aspect, an electronic device is provided, which includes a storage medium, a processor, and a computer program stored in the storage medium and executable on the processor, and is characterized in that the processor implements the method for testing the solid state disk code when executing the computer program.
Compared with the prior art, the method and the device have the advantages that the vehicle performance is evaluated based on the partial load of the vehicle instead of the ultimate dynamic property which can be achieved by the vehicle when the accelerator pedal is opened by 100%, and the actual driving condition of a driver can be better fitted, so that the daily actual driving feeling is well reflected.
Drawings
FIG. 1 is a schematic flow chart illustrating a method for analyzing vehicle performance according to an embodiment of the present invention;
FIG. 2 is a table relating starting accelerator pedal travel to starting peak acceleration provided by one embodiment of the present invention;
FIG. 3 is a table relating starting accelerator pedal travel to starting acceleration gain provided in accordance with one embodiment of the present invention;
FIG. 4 is a table relating reacceleration start vehicle speed to reacceleration acceleration gain provided in accordance with another embodiment of the present invention;
FIG. 5 is a table relating reacceleration start vehicle speed to reacceleration peak acceleration provided in accordance with another embodiment of the present invention;
FIG. 6 is a schematic flow chart illustrating a method for analyzing vehicle performance according to another embodiment of the present invention;
FIG. 7 is a table relating target uniform speed to uniform accelerator pedal travel provided by an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an automobile performance analysis system according to an embodiment of the present invention.
Reference numerals:
100. an automotive performance analysis system; 110. a data acquisition module; 120. an accelerated test module; 121. a starting acceleration test unit; 122. a reacceleration acceleration test unit; 130. an accelerated evaluation module; 131. a data acquisition unit; 132. a data selection unit; 133. an acceleration evaluation unit; 140. a constant speed testing module; 141. a constant speed test unit; 142. a travel acquisition unit; 150. and a constant speed evaluation module.
Detailed Description
Reference will now be made in detail to the present embodiments of the invention, examples of which are illustrated in the accompanying drawings. While the invention will be described in conjunction with the specific embodiments, it will be understood that they are not intended to limit the invention to the embodiments described. On the contrary, it is intended to cover alternatives, modifications, and equivalents as may be included within the spirit and scope of the invention as defined by the appended claims. It should be noted that the method steps described herein may be implemented by any functional block or functional arrangement, and that any functional block or functional arrangement may be implemented as a physical entity or a logical entity, or a combination of both.
In order that those skilled in the art will better understand the present invention, the following detailed description of the invention is provided in conjunction with the accompanying drawings and the detailed description of the invention.
Note that: the example to be described next is only a specific example, and does not limit the embodiments of the present invention necessarily to the following specific steps, values, conditions, data, orders, and the like. Those skilled in the art can, upon reading this specification, utilize the concepts of the present invention to construct more embodiments than those specifically described herein.
Referring to fig. 1, an embodiment of the present invention provides an automobile performance analysis method, including the following steps:
s100, acquiring a performance analysis type to be tested, a test mode and test parameters;
s200, when the performance analysis type is detected to be the acceleration dynamic property, controlling the vehicle to be evaluated to start accelerating according to the test mode and the test parameters until the vehicle to be evaluated reaches a certain vehicle speed and drives at a uniform speed;
s300, acquiring a peak acceleration of the vehicle to be evaluated in an acceleration process of accelerating to the certain speed, and acquiring the acceleration dynamic property of the vehicle to be evaluated according to the test parameters and the peak acceleration;
s400, when the performance analysis type is detected to be the constant-speed driving dynamic property, controlling the vehicle to be evaluated to reach a target constant-speed and drive at a constant speed according to the test mode, and collecting the constant-speed accelerator pedal stroke of the vehicle to be evaluated in a constant-speed driving state, wherein the test parameters comprise the target constant-speed;
s500, acquiring the constant speed driving dynamic performance of the vehicle to be evaluated based on the target constant speed according to the travel of the constant speed accelerator pedal.
Specifically, part load dynamic property: the power feeling of the driver who steps on any accelerator pedal stroke. In-situ starting dynamic property: and when the vehicle is static, the driver can feel the power of stepping on any accelerator pedal for a stroke. Partial load reacceleration dynamics: and when the vehicle runs at a constant speed, the driver feels the power when stepping on a certain accelerator pedal stroke increment. Acceleration gain: when the vehicle runs at a constant speed, the vehicle can obtain the acceleration by stepping down the accelerator pedal per millimeter.
In this embodiment, a performance analysis type to be tested, a test mode and test parameters are obtained, the performance analysis type includes acceleration dynamics and uniform speed driving dynamics, the test mode is a test method flow of each performance analysis type, and the corresponding test modes of different types of performance analyses are different. The test parameters are parameter indexes which need to be reached by controlling the vehicle in each test process, and are mainly used for controlling the vehicle to be evaluated to respectively execute corresponding performance evaluation tests.
And when the performance analysis type is detected to be the acceleration dynamic property, evaluating the performance of the vehicle in the acceleration process, and controlling the vehicle to be evaluated to start accelerating according to the test mode and the test parameters until the vehicle to be evaluated reaches a certain vehicle speed and drives at a uniform speed. And acquiring the peak acceleration of the vehicle to be evaluated in the acceleration process when the vehicle to be evaluated is accelerated to a certain speed, and acquiring the acceleration dynamic property of the vehicle to be evaluated according to the test parameters and the peak acceleration.
When the performance analysis type is detected to be the constant-speed driving dynamic property, the performance of the vehicle in the constant-speed driving process is evaluated, so that the vehicle to be evaluated is controlled to reach the target constant-speed and to drive at the constant speed according to the test mode, the constant-speed accelerator pedal stroke of the vehicle to be evaluated in the constant-speed driving state is collected, and the test parameters comprise the target constant-speed. And then acquiring the constant speed driving dynamic property of the vehicle to be evaluated based on the target constant speed according to the travel of the constant speed accelerator pedal.
The invention identifies the performance category to be evaluated through the performance analysis type, and then executes the corresponding performance test according to the test parameters, so as to objectively evaluate the dynamic property of the vehicle. Meanwhile, the dynamic performance of the vehicle is evaluated based on partial load of the vehicle instead of the limit dynamic performance which can be achieved by the vehicle when the opening degree of an accelerator pedal is 100%, and the dynamic performance can be more fit with the actual driving condition of a driver, so that the daily actual driving feeling is well reflected.
Optionally, in another embodiment of the present invention, the step of "S200, when it is detected that the performance analysis type is acceleration dynamics, controlling the vehicle to be evaluated to start accelerating according to the test mode and the test parameter until the vehicle to be evaluated reaches a certain vehicle speed and uniform running", includes the following steps:
s210, the acceleration dynamic property comprises a starting acceleration dynamic property and a re-acceleration dynamic property;
s220, when the performance analysis type is detected to be starting acceleration dynamic property, controlling a vehicle to be evaluated to start acceleration from a standstill to a certain vehicle speed for uniform running according to a starting accelerator pedal stroke, wherein the test parameters comprise the starting accelerator pedal stroke;
s230, when the performance analysis type is detected to be reacceleration acceleration dynamic property, controlling the vehicle to be evaluated to keep the reacceleration initial vehicle speed to run at a constant speed, wherein the test parameters comprise the reacceleration initial vehicle speed and the travel increment of an accelerator pedal;
and S240, controlling the vehicle to be evaluated to accelerate according to the travel increment of the accelerator pedal until the vehicle to be evaluated reaches a certain vehicle speed and runs at a uniform speed.
Specifically, in the present embodiment, the acceleration dynamics of the vehicle include a start dynamics for starting acceleration from a standstill and a reacceleration dynamics for starting acceleration from a constant speed, depending on the state of the vehicle before starting acceleration. In this case, the vehicle is finally under partial load, i.e. the accelerator pedal travel is not 100%.
When the performance analysis type is detected to be starting acceleration dynamic property, controlling the vehicle to be evaluated to start acceleration from a standstill according to the starting accelerator pedal stroke under the starting gear, namely keeping the accelerator pedal stroke constant under the starting accelerator pedal stroke until the vehicle to be evaluated reaches a certain vehicle speed and uniform speed to run, wherein the test parameters comprise the starting accelerator pedal stroke. The speed of the vehicle to be evaluated is not constant due to the change of different factors during testing, such as the change of the environment state of the vehicle to be evaluated, and the purpose of controlling the vehicle to be evaluated to start accelerating is to collect data in the accelerating process subsequently, so that when the vehicle to be evaluated is detected to be accelerated to a certain vehicle speed and the certain vehicle speed is kept constant and exceeds the preset time length, the vehicle to be evaluated is judged to reach a constant-speed running state.
The accelerator pedal stroke CAN be obtained by converting an accelerator pedal opening signal which CAN be read by a vehicle CAN (controller area network), and the actual pedal stroke CAN be obtained by multiplying the pedal opening by the effective total stroke and adding the idle stroke and CAN also be directly obtained by additionally arranging a displacement sensor. During testing, if an accelerator pedal position signal is obtained through vehicle CAN information, the selection of a typical working condition point is still measured by the opening degree of the accelerator pedal, and then the typical working condition point is converted into an accelerator pedal stroke which is more suitable to be used as a comparison reference, namely the free conversion between the accelerator pedal stroke and the opening degree of the accelerator pedal CAN be realized.
The method includes the steps that starting peak accelerations corresponding to a plurality of starting accelerator pedal strokes of the same vehicle to be evaluated are obtained, as shown in fig. 2, a table is drawn by taking the starting accelerator pedal strokes as a horizontal axis and the starting peak accelerations as a vertical axis, so that starting acceleration dynamics of the vehicle to be evaluated under different starting accelerator pedal strokes can be known more intuitively. And if the starting peak acceleration corresponding to a certain starting accelerator pedal stroke is larger than the starting peak acceleration corresponding to another starting accelerator pedal stroke, judging that the starting acceleration dynamic property of the vehicle to be evaluated is stronger in one starting accelerator pedal stroke with larger starting peak acceleration. Further, the starting peak accelerations corresponding to the starting accelerator pedal strokes of a plurality of different vehicles to be evaluated can be drawn in a unified table, such as the vehicle type 1 and the vehicle type 2 in fig. 2, so that the starting acceleration dynamics of different vehicles to be evaluated under the same starting accelerator pedal stroke can be more intuitively understood, and the acceleration dynamics of different vehicles to be evaluated need to be limited to the same starting accelerator pedal stroke.
In addition, target peak acceleration values respectively corresponding to different target starting accelerator pedal strokes of a plurality of vehicles to be evaluated are obtained, starting acceleration gains are calculated according to the target starting accelerator pedal strokes and the corresponding target peak acceleration values, and then starting acceleration dynamics of the vehicles to be evaluated are evaluated according to the starting acceleration gains. Wherein the accelerator pedal stroke s is started according to the target1And target peak acceleration a1Calculating the starting acceleration gain Delta a at the time of unit starting accelerator pedal stroke1，
The target starting accelerator pedal stroke is taken as a horizontal axis, the starting acceleration gain is taken as a vertical axis to draw a table, and the starting acceleration gains corresponding to the starting accelerator pedal strokes of a plurality of different vehicles to be evaluated are respectively drawn in a unified table, such as a vehicle type 1 and a vehicle type 2 shown in fig. 3, so that the starting acceleration dynamics of the different vehicles to be evaluated under the different starting accelerator pedal strokes can be more intuitively understood. And under the same starting accelerator pedal stroke, if the starting acceleration gain corresponding to a certain vehicle to be evaluated is larger than the starting acceleration gain corresponding to another vehicle to be evaluated, judging that the starting acceleration dynamic of the vehicle to be evaluated with larger starting acceleration gain is stronger. And evaluating the acceleration dynamics of different vehicles to be evaluated, and limiting the acceleration dynamics to the same starting accelerator pedal stroke.
When the performance analysis type is detected to be the reacceleration acceleration dynamic property, firstly, the vehicle to be evaluated is controlled to reach the reacceleration initial speed, then the vehicle to be evaluated is controlled to be accelerated from the reacceleration initial speed according to the test parameters until the vehicle to be evaluated reaches a certain speed and drives at a uniform speed. The test parameters comprise a reacceleration starting speed and a reacceleration accelerator pedal stroke increment, and for the same vehicle to be evaluated, the acceleration is carried out based on different reacceleration starting speeds, and the corresponding reacceleration dynamic properties are different. The vehicle to be evaluated is controlled to keep at the reacceleration starting vehicle speed, wherein the vehicle to be evaluated can be directly accelerated to the reacceleration starting vehicle speed from a static or lower vehicle speed (for example, the preset vehicle speed is reduced on the basis of the reacceleration starting vehicle speed), or can be accelerated to a higher vehicle speed (for example, the preset vehicle speed is increased on the basis of the reacceleration starting vehicle speed) and then is decelerated to the reacceleration starting vehicle speed, and then the reacceleration starting vehicle speed is kept to be driven at a constant speed.
And when the vehicle to be evaluated keeps the reacceleration initial speed to run at a constant speed, controlling the vehicle to be evaluated to accelerate according to the travel increment of the reacceleration accelerator pedal, namely stepping on the pedal travel corresponding to the travel increment of the reacceleration accelerator pedal again. After the pedal stroke corresponding to the stroke increment of the re-acceleration accelerator pedal is stepped for a period of time, namely the stroke of the accelerator pedal is kept constant at the sum of the original stroke for maintaining the constant-speed running of the vehicle and the stroke increment of the re-acceleration accelerator pedal, the vehicle to be evaluated gradually tends to run at a constant speed, namely the vehicle to be evaluated reaches a certain vehicle speed and runs at a constant speed.
Acquiring the peak acceleration of a vehicle to be evaluated in an acceleration process from a reacceleration initial speed to a certain speed, calculating a reacceleration acceleration gain delta a of a unit reacceleration acceleration pedal stroke according to the reacceleration acceleration pedal stroke increment s and the peak acceleration a in the acceleration process from the reacceleration initial speed to the certain speed,
and acquiring the reacceleration dynamics of the vehicle to be evaluated based on the travel increment of the reacceleration accelerator pedal according to the acceleration gain. Wherein the larger the gain of the reacceleration acceleration, the better the reacceleration dynamics of the vehicle under evaluation. Further, for the same vehicle to be evaluated, it is necessary to evaluate the reacceleration dynamics at different reacceleration start vehicle speeds based on the same reacceleration accelerator pedal stroke increment. For different vehicles to be evaluated, the re-acceleration dynamic property of the vehicles needs to be evaluated based on the same re-acceleration pedal stroke increment and the same re-acceleration starting vehicle speed.
According to the method and the device, the reacceleration dynamics of the vehicle to be evaluated is judged through the reacceleration acceleration gain during the reacceleration acceleration pedal stroke increment, pedal parameters (such as corresponding relation between the pedal opening and the pedal stroke and the like) of each vehicle to be evaluated do not need to be considered, the difficulty that a driver needs to convert the pedal stroke of treading into the accelerator pedal opening and the problem that the accelerator pedal opening is not uniform as a comparison reference are avoided, so that the evaluation standard is more uniform, and the different vehicles to be evaluated can be compared conveniently.
In addition, the reacceleration acceleration gains corresponding to the vehicle to be evaluated at the plurality of reacceleration start vehicle speeds under the same reacceleration accelerator pedal travel increment may be obtained, and then a visual graph relating the reacceleration start vehicle speed and the reacceleration start vehicle speed may be plotted with the reacceleration start vehicle speed as a horizontal axis and the reacceleration acceleration gain as a vertical axis according to the reacceleration acceleration gains corresponding to the plurality of reacceleration start vehicle speeds and the plurality of reacceleration start vehicle speeds, as shown in fig. 4. And if the corresponding reacceleration acceleration gain under a certain reacceleration initial vehicle speed is larger than the corresponding reacceleration acceleration gain under another reacceleration initial vehicle speed, judging that the reacceleration power of the vehicle to be evaluated under the reacceleration accelerator pedal stroke increment is stronger at the certain reacceleration initial vehicle speed than at another reacceleration initial vehicle speed. In addition, based on the same travel increment of the reaccelerating accelerator pedal, the reacceleration initial vehicle speed is taken as the horizontal axis, and the reacceleration acceleration gain is taken as the vertical axis, so that the reacceleration acceleration gains of different vehicles to be evaluated under the reacceleration initial vehicle speeds can be respectively drawn into a visual chart associated with the reacceleration initial vehicle speed and the reacceleration acceleration gain, and the reacceleration dynamic performance of the vehicles to be evaluated can be visually and quantitatively checked and compared.
The starting acceleration dynamics can also be evaluated from the reacceleration peak acceleration. As shown in fig. 6, a table is drawn with the reacceleration start vehicle speed as the horizontal axis and the reacceleration peak acceleration as the vertical axis for the same accelerator pedal stroke increment, so that the partial load reacceleration dynamics of the vehicle to be evaluated at different reacceleration start vehicle speeds can be more intuitively understood. And if the corresponding reacceleration peak acceleration under a certain reacceleration starting vehicle speed is larger than the corresponding reacceleration peak acceleration under another reacceleration starting vehicle speed, judging that the reacceleration dynamic of the vehicle to be evaluated at the reacceleration starting vehicle speed with the larger reacceleration peak acceleration is stronger. Further, the reacceleration peak accelerations corresponding to the same accelerator pedal stroke increment and the plurality of reacceleration start vehicle speeds of a plurality of different vehicles to be evaluated can be plotted in the same table, such as vehicle type 1 and vehicle type 2 shown in fig. 5, so that the reacceleration dynamics of different vehicles to be evaluated under different reacceleration start vehicle speeds under the same accelerator pedal stroke increment can be more intuitively understood.
Optionally, as shown in fig. 6, in another embodiment of the present invention, the step of "S300 acquiring a peak acceleration of the vehicle to be evaluated in an acceleration process of accelerating to the certain vehicle speed, and obtaining an accelerated dynamic property of the vehicle to be evaluated according to the test parameter and the peak acceleration" includes the following steps:
s310, collecting all acceleration data of the vehicle to be evaluated in the acceleration process of accelerating to the certain speed;
s320, selecting the maximum acceleration in all the acceleration data as the peak acceleration;
s330, acquiring the acceleration dynamic property of the vehicle to be evaluated according to the test parameters and the peak acceleration.
Specifically, in this embodiment, all acceleration data in an acceleration process of the vehicle to be evaluated accelerating to a certain vehicle speed is collected, where the acceleration process is a process of starting acceleration from a standstill to a certain vehicle speed, or a process of starting acceleration from a reacceleration to a certain vehicle speed. And selecting the maximum acceleration in all the acceleration data as peak acceleration, wherein the starting acceleration dynamic property corresponds to the starting peak acceleration, and the reacceleration acceleration dynamic property corresponds to the reacceleration peak acceleration to obtain the acceleration dynamic property of the vehicle to be evaluated according to the test parameters and the peak acceleration.
Optionally, in another embodiment of the present invention, when it is detected that the performance analysis type is the uniform speed running dynamics, the step of "S400 controlling the vehicle to be evaluated to reach a target uniform speed and run at a uniform speed according to the test mode, and acquiring a uniform speed accelerator pedal stroke of the vehicle to be evaluated in a uniform speed running state, where the test parameter includes the target uniform speed", includes the following steps:
s410, when detecting that the performance analysis type is the constant-speed driving dynamics, controlling the vehicle to be evaluated to accelerate from a first preset vehicle speed to the target constant-speed vehicle speed, and controlling the vehicle to be evaluated to keep the target constant-speed vehicle speed to drive at a constant speed, or; controlling the vehicle to be evaluated to accelerate to a second preset vehicle speed, then decelerating to the target constant speed from the second preset vehicle speed, and running at a constant speed, wherein the test parameters comprise the target constant speed;
and S420, acquiring the travel of a constant speed accelerator pedal of the vehicle to be evaluated in the constant speed running state of the target constant speed.
Specifically, in this embodiment, when it is detected that the performance analysis type is the constant speed driving dynamics, the performance of the vehicle in the constant speed driving state is evaluated, and the vehicle to be evaluated is controlled to keep driving at the target constant speed based on the obtained target constant speed. The vehicle to be evaluated may be a vehicle that is directly accelerated to a target constant speed from a first preset vehicle speed, where the first preset vehicle speed is a static or low vehicle speed (for example, the preset vehicle speed is reduced on the basis of the target constant speed), or the vehicle that is accelerated to a second preset vehicle speed and then decelerated to the target constant speed, where the second preset vehicle speed is a high vehicle speed (for example, the preset vehicle speed is increased on the basis of the target constant speed), and then the target constant speed is maintained to run at a constant speed. The method comprises the steps of collecting the travel of a constant-speed accelerator pedal of a vehicle to be evaluated in a constant-speed running state, namely the minimum travel of the accelerator pedal of the vehicle to be evaluated in the constant-speed running state at a target constant-speed, and obtaining the constant-speed running dynamic performance of the vehicle to be evaluated based on the target constant-speed according to the travel of the constant-speed accelerator pedal.
For the evaluation test of the constant-speed driving dynamic property, the gear switching modes of the manual-gear vehicle and the automatic-gear vehicle are different, and the acceleration modes corresponding to different gear selection of the manual-gear vehicle are different, so that the control modes of the manual-gear vehicle and the automatic-gear vehicle are different.
If the vehicle to be evaluated is detected to be a manual gear vehicle, a current test gear to be tested is obtained, the vehicle to be evaluated is controlled to accelerate to a target speed under the test gear, then the vehicle speed is reduced to a target constant speed for running, and the travel of a constant speed accelerator pedal of the vehicle to be evaluated under the constant speed running state is collected. In each gear, the acceleration mode of the manual gear vehicle is fixed, so that the uniform speed accelerator pedal stroke corresponds to the target uniform speed.
And if the vehicle to be evaluated is detected to be the automatic transmission vehicle, controlling the vehicle to be evaluated to accelerate to the target speed, and then reducing the speed to the target constant speed for running. For an automatic transmission vehicle, when the gear switching fluctuates, a plurality of uniform speed accelerator pedal strokes correspond to the same target uniform speed. For the same target constant speed, when the automatic transmission vehicle is in a high gear, the corresponding constant speed accelerator pedal stroke is smaller, and when the automatic transmission vehicle is in a low gear, the corresponding constant speed accelerator pedal stroke is larger, so that the target speed is reduced to the target constant speed by adopting a higher speed, so that the constant speed accelerator pedal stroke of the vehicle to be evaluated in the constant speed running state at the higher gear, namely the minimum constant speed accelerator pedal stroke corresponding to the target constant speed, is collected. The vehicle speed difference between the target vehicle speed and the target constant speed is not particularly limited.
According to the invention, the vehicle to be evaluated is accelerated to the target speed, and then the vehicle speed is reduced to the target constant speed for running, so that the collected constant speed accelerator pedal stroke corresponding to the target constant speed when the vehicle to be evaluated is in a high gear, namely the minimum constant speed accelerator pedal stroke, is ensured, and the constant speed running dynamic property of the vehicle to be evaluated can be more represented.
The uniform speed accelerator pedal strokes corresponding to a plurality of target uniform speed speeds of the same vehicle to be evaluated are obtained, as shown in fig. 7, a table is drawn by taking the target uniform speed as a horizontal axis and taking the uniform speed accelerator pedal stroke as a vertical axis, so that the uniform speed driving dynamics of the vehicle to be evaluated under different target uniform speed speeds can be known more intuitively. And if the corresponding uniform speed accelerator pedal stroke under a certain target uniform speed is smaller than the corresponding uniform speed accelerator pedal stroke under another target uniform speed, judging that the uniform speed driving power of the vehicle to be evaluated is stronger under the target uniform speed with smaller uniform speed accelerator pedal stroke.
Further, uniform speed accelerator pedal strokes corresponding to a plurality of target uniform speed speeds of a plurality of different vehicles to be evaluated respectively may be drawn in a unified table, such as vehicle type 1 and vehicle type 2 in fig. 7, so that uniform speed driving dynamics of different vehicles to be evaluated at the same target uniform speed can be known more intuitively, and the uniform speed driving dynamics of different vehicles to be evaluated need to be limited to the same target uniform speed. In addition, when the vehicle to be evaluated is a manual transmission vehicle, the same test gear is defined.
As shown in fig. 8, the present invention provides an automobile performance analysis system 100, comprising:
a data obtaining module 110, configured to obtain a performance analysis type, a test mode, and test parameters to be tested;
the acceleration testing module 120 is in communication connection with the data acquisition module 110, and is configured to control the vehicle to be evaluated to start accelerating according to the testing mode and the testing parameters when it is detected that the performance analysis type is acceleration dynamics, until the vehicle to be evaluated reaches a certain vehicle speed and drives at a uniform speed;
the acceleration evaluation module 130 is in communication connection with the acceleration test module 120, and is configured to acquire a peak acceleration of the vehicle to be evaluated in an acceleration process of accelerating to the certain vehicle speed, and acquire an acceleration dynamic property of the vehicle to be evaluated according to the test parameter and the peak acceleration;
a constant speed test module 140, communicatively connected to the data acquisition module 110, configured to control the vehicle to be evaluated to reach a target constant speed and run at a constant speed according to the test mode when detecting that the performance analysis type is the constant speed running dynamics, and collect a constant speed accelerator pedal stroke of the vehicle to be evaluated in a constant speed running state, where the test parameter includes the target constant speed;
and the constant speed evaluation module 150 is in communication connection with the constant speed test module 140, and is configured to obtain the constant speed driving dynamics of the vehicle to be evaluated based on the target constant speed according to the constant speed accelerator pedal stroke.
The accelerated test module 120 includes:
the starting acceleration testing unit 121 is configured to, when it is detected that the performance analysis type is a starting acceleration dynamic property, control a vehicle to be evaluated to start accelerating to the certain vehicle speed and run at a constant speed from a standstill according to a starting accelerator pedal stroke, where the test parameter includes the starting accelerator pedal stroke; the acceleration dynamic property comprises a starting acceleration dynamic property and a re-acceleration dynamic property;
a reacceleration acceleration test unit 122, configured to, when it is detected that the performance analysis type is reacceleration acceleration dynamics, control the vehicle to be evaluated to keep running at a reacceleration start vehicle speed at a constant speed, where the test parameters include the reacceleration start vehicle speed and an accelerator pedal travel increment; and controlling the vehicle to be evaluated to accelerate according to the travel increment of the accelerator pedal until the vehicle to be evaluated reaches a certain vehicle speed and runs at a uniform speed.
The accelerated evaluation module 130 includes:
the data acquisition unit 131 is used for acquiring all acceleration data of the vehicle to be evaluated in the acceleration process of accelerating to the certain speed;
the data selecting unit 132 is in communication connection with the data acquiring unit 131, and is configured to select a maximum acceleration of all the acceleration data as the peak acceleration;
and the acceleration evaluation unit 133 is in communication connection with the data selection unit 132 and is configured to obtain the acceleration dynamic property of the vehicle to be evaluated according to the test parameter and the peak acceleration.
The uniform speed testing module 140 includes:
the constant speed test unit 141 is configured to, when it is detected that the performance analysis type is the constant speed driving dynamics, control the vehicle to be evaluated to accelerate from a first preset vehicle speed to the target constant speed vehicle speed, and control the vehicle to be evaluated to keep the target constant speed vehicle speed driving at a constant speed, or; controlling the vehicle to be evaluated to accelerate to a second preset vehicle speed, then decelerating to the target constant speed from the second preset vehicle speed, and running at a constant speed, wherein the test parameters comprise the target constant speed;
and the stroke acquisition unit 142 is in communication connection with the constant speed test unit 141 and is used for acquiring the constant speed accelerator pedal stroke of the vehicle to be evaluated in the target constant speed running state at the constant speed.
Specifically, the functions of each module in this embodiment have been described in detail in the corresponding method embodiment, and thus are not described in detail again.
Based on the same inventive concept, the embodiments of the present application further provide a computer-readable storage medium, on which a computer program is stored, and the computer program, when executed by a processor, implements all or part of the method steps of the above method.
The present invention can implement all or part of the processes of the above methods, and can also be implemented by using a computer program to instruct related hardware, where the computer program can be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of the above method embodiments can be implemented. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U.S. disk, removable hard disk, magnetic disk, optical disk, computer Memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, in accordance with legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunications signals.
Based on the same inventive concept, an embodiment of the present application further provides an electronic device, which includes a memory and a processor, where the memory stores a computer program running on the processor, and the processor executes the computer program to implement all or part of the method steps in the method.
The Processor may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. The general purpose processor may be a microprocessor or the processor may be any conventional processor or the like, the processor being the control center of the computer device and the various interfaces and lines connecting the various parts of the overall computer device.
The memory may be used to store computer programs and/or modules, and the processor may implement various functions of the computer device by executing or executing the computer programs and/or modules stored in the memory, as well as by invoking data stored in the memory. The memory may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required by at least one function (e.g., a sound playing function, an image playing function, etc.); the storage data area may store data (e.g., audio data, video data, etc.) created according to the use of the cellular phone. In addition, the memory may include high speed random access memory, and may also include non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), at least one magnetic disk storage device, a Flash memory device, or other volatile solid state storage device.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, server, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), servers and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. An automobile performance analysis method is characterized by comprising the following steps:
acquiring a performance analysis type to be tested, a testing mode and testing parameters;
when the performance analysis type is detected to be the acceleration dynamic property, controlling the vehicle to be evaluated to start accelerating according to the test mode and the test parameters until the vehicle to be evaluated reaches a certain vehicle speed and drives at a constant speed;
acquiring the peak acceleration of the vehicle to be evaluated in the acceleration process of accelerating to the certain speed, and acquiring the acceleration dynamic property of the vehicle to be evaluated according to the test parameters and the peak acceleration;
when the performance analysis type is detected to be the constant-speed driving dynamic property, controlling the vehicle to be evaluated to reach a target constant-speed and drive at a constant speed according to the test mode, and collecting the constant-speed accelerator pedal stroke of the vehicle to be evaluated in a constant-speed driving state, wherein the test parameters comprise the target constant-speed;
and acquiring the constant-speed running dynamic performance of the vehicle to be evaluated based on the target constant-speed according to the travel of the constant-speed accelerator pedal.
2. The vehicle performance analysis method according to claim 1, wherein the step of controlling the vehicle to be evaluated to start accelerating until the vehicle to be evaluated reaches a certain vehicle speed and uniform speed according to the test pattern and the test parameter when it is detected that the performance analysis type is acceleration dynamics, comprises the steps of:
the acceleration dynamic property comprises a starting acceleration dynamic property and a re-acceleration dynamic property;
when the performance analysis type is detected to be starting acceleration dynamic property, controlling a vehicle to be evaluated to start accelerating to a certain vehicle speed and run at a constant speed according to a starting accelerator pedal stroke from a standstill, wherein the test parameters comprise the starting accelerator pedal stroke;
when the performance analysis type is detected to be reacceleration acceleration dynamic property, controlling the vehicle to be evaluated to keep running at a reacceleration initial vehicle speed at a constant speed, wherein the test parameters comprise the reacceleration initial vehicle speed and an accelerator pedal travel increment;
and controlling the vehicle to be evaluated to start accelerating from the re-acceleration starting speed according to the travel increment of the accelerator pedal until the vehicle to be evaluated reaches a certain vehicle speed and runs at a constant speed.
3. The automobile performance analysis method according to claim 1 or 2, wherein the step of acquiring a peak acceleration in an acceleration process in which the vehicle to be evaluated is accelerated to the certain vehicle speed, and acquiring the accelerated dynamics of the vehicle to be evaluated according to the test parameter and the peak acceleration includes the steps of:
acquiring all acceleration data of the vehicle to be evaluated in the acceleration process of accelerating to the certain speed;
selecting the maximum acceleration in all the acceleration data as the peak acceleration;
and acquiring the acceleration dynamic property of the vehicle to be evaluated according to the test parameters and the peak acceleration.
4. The automobile performance analysis method according to claim 1, wherein the step of controlling the vehicle to be evaluated to reach a target constant speed for constant speed running according to the test mode and collecting a constant speed accelerator pedal stroke of the vehicle to be evaluated in a constant speed running state when detecting that the performance analysis type is constant speed running dynamics comprises the steps of:
when the performance analysis type is detected to be the constant-speed driving dynamics, controlling the vehicle to be evaluated to accelerate from a first preset vehicle speed to the target constant-speed vehicle speed, and controlling the vehicle to be evaluated to keep the target constant-speed vehicle speed to drive at a constant speed, or; controlling the vehicle to be evaluated to accelerate to a second preset vehicle speed, then decelerating to the target constant speed from the second preset vehicle speed, and running at a constant speed, wherein the test parameters comprise the target constant speed;
and acquiring the travel of a constant speed accelerator pedal of the vehicle to be evaluated in the constant speed running state of the target constant speed.
5. An automotive performance analysis system, comprising:
the data acquisition module is used for acquiring the performance analysis type, the test mode and the test parameters to be tested;
the acceleration testing module is in communication connection with the data acquisition module and is used for controlling the vehicle to be evaluated to start accelerating according to the testing mode and the testing parameters when the performance analysis type is detected to be acceleration dynamic property until the vehicle to be evaluated reaches a certain vehicle speed and running at a constant speed;
the acceleration evaluation module is in communication connection with the acceleration test module and is used for acquiring the peak acceleration of the vehicle to be evaluated in the acceleration process of accelerating to the certain speed and acquiring the acceleration dynamic property of the vehicle to be evaluated according to the test parameters and the peak acceleration;
the constant-speed test module is in communication connection with the data acquisition module and is used for controlling the vehicle to be evaluated to reach a target constant-speed and run at a constant speed according to the test mode when the performance analysis type is detected to be the constant-speed running dynamic property, and collecting the constant-speed accelerator pedal stroke of the vehicle to be evaluated in a constant-speed running state, wherein the test parameters comprise the target constant-speed;
and the constant-speed evaluation module is in communication connection with the constant-speed test module and is used for acquiring the constant-speed running dynamic property of the vehicle to be evaluated based on the target constant-speed according to the travel of the constant-speed accelerator pedal.
6. The vehicle performance analysis system of claim 5, wherein the accelerated test module comprises:
the starting acceleration testing unit is used for controlling a vehicle to be evaluated to start accelerating to a certain vehicle speed and run at a constant speed according to a starting acceleration pedal stroke when the performance analysis type is detected to be starting acceleration dynamic, and the testing parameters comprise the starting acceleration pedal stroke; the acceleration dynamic property comprises a starting acceleration dynamic property and a re-acceleration dynamic property;
the system comprises a reacceleration acceleration testing unit, a performance analysis unit and a control unit, wherein the reacceleration acceleration testing unit is used for controlling a vehicle to be evaluated to keep running at a reacceleration initial speed at a constant speed when detecting that the performance analysis type is reacceleration acceleration dynamic property, and the testing parameters comprise the reacceleration initial speed and an accelerator pedal stroke increment; and controlling the vehicle to be evaluated to start accelerating from the re-acceleration starting speed according to the travel increment of the accelerator pedal until the vehicle to be evaluated reaches a certain vehicle speed and runs at a constant speed.
7. The vehicle performance analysis system according to claim 5 or 6, wherein the accelerated evaluation module includes:
the data acquisition unit is used for acquiring all acceleration data of the vehicle to be evaluated in the acceleration process of accelerating to the certain speed;
the data selection unit is in communication connection with the data acquisition unit and is used for selecting the maximum acceleration in all the acceleration data as the peak acceleration;
and the acceleration evaluation unit is in communication connection with the data selection unit and is used for acquiring the acceleration dynamic property of the vehicle to be evaluated according to the test parameters and the peak acceleration.
8. The vehicle performance analysis system of claim 5, wherein the constant velocity test module comprises:
the constant speed test unit is used for controlling the vehicle to be evaluated to accelerate from a first preset vehicle speed to the target constant speed when detecting that the performance analysis type is the constant speed driving dynamics, and controlling the vehicle to be evaluated to keep the target constant speed to drive at a constant speed, or; controlling the vehicle to be evaluated to accelerate to a second preset vehicle speed, then decelerating to the target constant speed from the second preset vehicle speed, and running at a constant speed, wherein the test parameters comprise the target constant speed;
and the stroke acquisition unit is in communication connection with the constant speed test unit and is used for acquiring the constant speed accelerator pedal stroke of the vehicle to be evaluated in the target constant speed running state at the constant speed.
9. A storage medium having stored thereon a computer program, wherein the computer program, when executed by a processor, implements the automobile re-acceleration performance analysis method according to any one of claims 1 to 4.
10. An electronic device comprising a storage medium, a processor, and a computer program stored in the storage medium and executable on the processor, wherein the processor implements the method for analyzing reacceleration performance of an automobile according to any one of claims 1 to 4 when executing the computer program.
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