CN112304641A - Ride comfort testing device and method for primary and secondary automobiles - Google Patents
Ride comfort testing device and method for primary and secondary automobiles Download PDFInfo
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- CN112304641A CN112304641A CN202011271594.1A CN202011271594A CN112304641A CN 112304641 A CN112304641 A CN 112304641A CN 202011271594 A CN202011271594 A CN 202011271594A CN 112304641 A CN112304641 A CN 112304641A
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
Abstract
The invention discloses a master-slave type automobile ride comfort testing device and a method, wherein the device comprises a master device and a slave device, the master device is arranged in an automobile to be tested, the slave device is arranged outside the automobile body and is parallel to the plane of the automobile body, the master device and the slave device are matched to measure the three-axis acceleration of the automobile, and the weighted acceleration root mean square value when the automobile is tested to run is calculated and used as an evaluation index of the running ride comfort of the automobile. The device is convenient to use and simple in steps, and the included angle between the coordinate system where the detection equipment is located and the ground coordinate system is measured by using the three-axis gyroscope, so that angle correction is performed on data measured by the linear accelerometer, and three-axis acceleration data under the automobile coordinate system is obtained.
Description
Technical Field
The invention relates to the technical field of automobile performance testing, in particular to a ride comfort testing device and method for a primary-secondary automobile.
Background
The market of second-hand vehicles is huge, and the smoothness of the vehicles needs to be quantitatively evaluated as a reference basis for vehicle transaction. However, because the traditional automobile ride comfort test has complex steps and high reproduction cost, in the actual transaction process, a merchant lacks the evaluation test of the automobile ride comfort, and customers mostly experience the ride comfort of the automobile by directly trying to drive, but when facing mass secondhand vehicles, the trial driving aiming at the purpose of experiencing the riding comfort (the automobile ride comfort) of the automobile can increase the purchasing time undoubtedly, and the transaction efficiency is reduced.
Disclosure of Invention
The invention aims to solve the technical problem of how to provide a primary-secondary type automobile ride comfort testing device which can simplify the automobile ride comfort detection process and improve the testing accuracy.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the utility model provides a smooth testing arrangement of primary and secondary formula car which characterized in that: the device comprises a mother device and a child device, wherein the mother device is arranged in a tested automobile, the child device is arranged outside the automobile body and is parallel to the plane where the automobile body is located, the mother device and the child device are matched to measure the three-axis acceleration of the automobile, and the weighted acceleration root mean square value when the automobile is tested to run is calculated and used as an evaluation index of the running smoothness of the automobile.
The further technical scheme is as follows: the female device comprises a casing, a first battery is arranged in the casing, a first voltage stabilizing module and a first perception testing module are arranged in the casing on the upper side of the first battery, a first main control board is arranged in the casing on the upper side of the first voltage stabilizing module and the first perception testing module, a top cover is arranged on the casing on the upper side of the first main control board and is used for sealing an upper end opening of the casing, the output end of the battery is connected with the power input end of the first voltage stabilizing module, the power output end of the first voltage stabilizing module is connected with the power input end of the first main control board and the power input end of the first perception testing module and is used for providing a working power supply for the power output end of the first perception testing module, and the data output end of the first perception testing module is connected with the data input end of the first main control.
The further technical scheme is as follows: the first voltage stabilizing module is provided with a charging interface, and the first battery is charged through the charging interface;
the further technical scheme is as follows: the first perception test module is provided with a first USB data transmission interface, and the first USB data transmission interface is used for outputting data collected by the first perception test module.
The further technical scheme is as follows: the first perception testing module comprises a triaxial accelerometer, a gyroscope and a data output module, wherein the triaxial accelerometer and the gyroscope are connected with a signal input end of the data output module and used for measuring the angle of the acceleration ground and the ground coordinate system.
The further technical scheme is as follows: the sub-device comprises a fixed base, the fixed base comprises a vertical part and a horizontal part, a base is arranged on the horizontal part, a power supply and a voltage stabilizing module are arranged in the base, a data acquisition and transmission module is arranged in the base above the voltage stabilizing module, a top shell is arranged on the base above the transmission module, an opening at the upper end of the base is sealed by the top shell, the voltage stabilizing device is used for providing a working power supply for the data acquisition and transmission module, and the data acquisition and transmission module is used for acquiring relevant data of an automobile plane coordinate system with a timestamp; the data acquisition and transmission module is provided with a second USB data transmission interface, the vertical part of the fixed base is provided with a mounting hole, and the joint of the vertical part and the horizontal part of the fixed base is provided with a reinforcing rib.
The invention also discloses a method for testing by using the primary-secondary automobile ride comfort testing device, which is characterized by comprising the following steps:
driving the tested automobile to the starting point of the test site;
pressing a power key to start the device and taking down the sub-device;
mounting a fixed base of the sub-device at a license plate fixing position, and mounting the sub-device on the fixed base;
fixing the master device at a saddle in a vehicle to be measured;
after the starting test is selected on the master device, the automobile starts to test a test site;
after the automobile is driven to the terminal, the selection test is finished;
taking down the child device and connecting the child device with the parent device through a USB interface;
selecting data input, and waiting for the end of data transmission;
and after the data transmission is finished, calculating the evaluation index of the running smoothness of the automobile according to the tested data, outputting the test result and finishing the test.
The further technical scheme is as follows: the method for calculating the evaluation index of the running smoothness of the automobile comprises the following steps:
the primary-secondary device configuration is used for correcting the three-axis acceleration of the automobile: driving the vehicle to a horizontal area of a test site, installing a test mother device at the positions of a driver seat, a driver bottom plate and the like, installing a fixed plate of a test child device between a license plate and the vehicle, installing the child device at a specific position of the fixed plate, wherein the plane of the child device is the plane of the vehicle, and measuring a group of initial angles alpha by a gyroscope in the child devicex*、αy*、αzAs the angle between the plane coordinate system of the vehicle and the ground coordinate system, the gyroscope in the parent device also measures a set of initial angles αx**、αy**、αzThen, the included angle between the plane where the master device is located and the plane where the automobile is located, namely the plane where the slave device is located, is as follows:
ω＝αy**-αy*
κ＝αz**-αz*
the actual three-axis acceleration of the automobile can be obtained through left-side transformation of the acceleration measured by an accelerometer in the parent device, and the calculation relationship is as follows:
rotating the coordinate system of the mother device around the z axis by an angle k under the right-hand system:
rotation angle ω about y-axis:
rotation angle around x axis
Fusing the three-axis rotation into a rotation matrix:
Wherein each element is respectively:
therefore, the triaxial acceleration measured in the parent device can be converted into the triaxial acceleration under the automobile coordinate system;
and finally, according to the comfort weight in ISO 2631(1997), calculating the weighted acceleration root mean square value when the automobile is tested to run as an evaluation index of the running smoothness of the automobile.
The further technical scheme is as follows: selecting different stm32 chips as the calculation cores of the primary and secondary devices; a surface mount type gyroscope and a linear accelerometer are arranged in the mother device and are positioned on the same circuit board so as to ensure that the surface mount type gyroscope and the linear accelerometer are always positioned on the same horizontal plane.
The further technical scheme is as follows: the power module and the measuring unit are designed into two circuit boards in the mother device so as to isolate the influence of large current on the test element; the fixing base of the sub-device arranged at the license plate is used for fixing the sub-device to be parallel to the plane of the automobile.
Adopt the produced beneficial effect of above-mentioned technical scheme to lie in: compared with the traditional automobile ride comfort detection method and device, the automobile ride comfort detection device has the advantage of small size and is convenient to carry. This product convenient to use, the step is simple, use the three-axis gyroscope to measure the contained angle between check out test set place coordinate system and the ground coordinate system, thereby carry out the angle correction to the data that linear accelerometer measured, thereby reachs triaxial acceleration data under the car coordinate system, consequently this product can install any angle in the inside any position of car when carrying out car ride comfort and detecting, and need not relative automobile body level and place, when having simplified car ride comfort greatly and measuring, the step of testing arrangement installation, convenient to use. The most important index of the smoothness test is taken as an evaluation parameter, and some minor parameters which have little influence on the human body are ignored, so that a non-professional person can test and evaluate the smoothness of the automobile according to the test flow of the product.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
FIG. 1 is a schematic diagram of a parent device in an apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a neutron device in an embodiment of the invention;
FIG. 3 is a flow chart of a method according to an embodiment of the invention;
wherein: 1. a parent device; 11. a housing; 12. a first battery; 13. a first voltage stabilization module; 14. a first perception test module; 15. a first main control panel; 16. a machine top cover; 17. a charging interface; 18. a first USB data transmission interface; 2. a sub-device; 21. a fixed base; 22. a machine base; 23. a voltage stabilization module; 24. a data acquisition and transmission module; 25. a top case; 26. a second USB data transmission interface; 27. mounting holes; 28. and (5) reinforcing ribs.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways than those specifically described and will be readily apparent to those of ordinary skill in the art without departing from the spirit of the present invention, and therefore the present invention is not limited to the specific embodiments disclosed below.
The embodiment of the invention discloses a primary-secondary type automobile ride comfort testing device which comprises a primary device 1 and a secondary device 2, wherein the primary device 1 is installed in an automobile to be tested, the secondary device 2 is installed outside the automobile to be tested and is parallel to the plane of the automobile body, the primary device 1 is matched with the secondary device 2 to measure the three-axis acceleration of the automobile, and the root mean square value of the weighted acceleration during automobile test driving is calculated and used as an evaluation index of the automobile ride comfort.
Further, as shown in fig. 1, the parent device 1 includes a housing 11, a first battery 12 is disposed in the housing 11, a first voltage stabilizing module 13 and a first sensing test module 14 are arranged in the casing 11 at the upper side of the first battery 12, a first main control board 15 is arranged in the machine shell at the upper side of the first voltage stabilizing module 13 and the first perception test module 14, a machine top cover 16 is arranged on the machine shell at the upper side of the first main control board 15, the upper end opening of the machine shell 11 is sealed through the top cover 16, the output end of the battery is connected with the power input end of the first voltage stabilizing module 13, the power output end of the first voltage stabilizing module 13 is connected with the power input ends of the first main control board 15 and the first perception test module 14, the data output end of the first perception test module 14 is connected with the data input end of the first main control board 15.
Further, as shown in fig. 1, a charging interface 17 is disposed on the first voltage stabilizing module 13, and the first battery 12 is charged through the charging interface 17. The first perception test module 14 is provided with a first USB data transmission interface 18, and the first USB data transmission interface 18 is configured to output data collected by the first perception test module 14. The first perception test module 14 comprises a triaxial accelerometer, a gyroscope and a data output module, wherein the triaxial accelerometer and the gyroscope are connected with a signal input end of the data output module and used for measuring the angle of the acceleration ground and the ground coordinate system.
A top case: protecting internal electronic components; the main control board: the circuit board with the integrated computing core, the keys and the OLED display screen mainly takes on the tasks of computing and man-machine interaction. A voltage stabilizing module: the voltage input from the battery is stabilized at 3.3v, and the device can work under the stable voltage. Perception test module: the circuit board integrates the triaxial accelerometer, the gyroscope and the data output module together and is used for measuring acceleration, angles of a ground coordinate system and other related data and receiving and outputting test data. A battery: and energy is provided for the system operation. A shell: the housing contains the components of the protective device, the bottom of the housing is smooth, and the device can be fixed in place by a disposable double-sided adhesive.
As shown in fig. 2, the sub-device 2 includes a fixed base 21, the fixed base 21 includes a vertical portion and a horizontal portion, a base 22 is disposed on the horizontal portion, a power supply and voltage regulation module 23 is disposed in the base 22, a data acquisition and transmission module 24 is disposed in the base above the voltage regulation module 23, a top case 25 is disposed on the base above the transmission module, an upper opening of the base 22 is closed by the top case 25, the voltage regulation device is used for providing a working power supply for the data acquisition and transmission module, and the data acquisition and transmission module is used for acquiring relevant data of a plane coordinate system of an automobile with a timestamp; the data acquisition and transmission module is provided with a second USB data transmission interface 26, the vertical part of the fixed base 21 is provided with a mounting hole 27, and the joint of the vertical part and the horizontal part of the fixed base 21 is provided with a reinforcing rib 28.
The sub-device is fixed with the sub-device fixing plate through four bolts, and the sub-device fixing plate is slightly larger than a normal license plate in specification and is installed and fixed at the automobile license plate installation position together with the license plate. The top shell of the sub-device: protecting internal electronic components; the data acquisition and transmission module: and collecting relevant data of the plane coordinate system of the automobile with the timestamp. USB data output interface: outputting the acquired data and undertaking the task of a charging interface; power and voltage regulator module: the device is powered and stable voltage is ensured to be output so as to ensure the normal work of the device. The sub-device base comprises: protect the internal components and parts, and play a role in connecting with the fixed base. The sub-device fixing base: the device is arranged at the position of a license plate, provides a plane parallel to the plane of the automobile and undertakes the installation and fixation tasks of the sub-devices.
As shown in fig. 3, the invention also discloses a method for testing by using the ride comfort testing device for the child-mother type automobile, which comprises the following steps:
driving the tested automobile to the starting point of the test site;
pressing a power key to start the device and taking down the sub-device;
mounting a fixed base of the sub-device at a license plate fixing position, and mounting the sub-device on the fixed base;
fixing the master device at a saddle in a vehicle to be measured;
after the starting test is selected on the master device, the automobile starts to test a test site;
after the automobile is driven to the terminal, the selection test is finished;
taking down the child device and connecting the child device with the parent device through a USB interface;
selecting data input, and waiting for the end of data transmission;
and after the data transmission is finished, calculating the evaluation index of the running smoothness of the automobile according to the tested data, outputting the test result and finishing the test.
Further, the method comprises the following steps:
1) different chips of stm32 are respectively selected as the computing cores of the primary and secondary devices.
2) A surface mount type gyroscope and a linear accelerometer are arranged in the mother device and are positioned on the same circuit board so as to ensure that the surface mount type gyroscope and the linear accelerometer are always positioned on the same horizontal plane.
3) The power module and the measuring unit are designed into two circuit boards in the mother device so as to isolate the influence of large current on the test element.
4) More than ninety percent of the vehicles are provided with license plates which are perpendicular to the plane of the four wheels of the vehicle, so that the sub-device fixing plate arranged at the license plate is used for fixing the sub-device to be parallel to the plane of the vehicle.
5) The primary-secondary device configuration is used for correcting the three-axis acceleration of the automobile: driving the vehicle to a horizontal area of a test site, installing a test mother device at the positions of a driver seat, a driver bottom plate and the like, installing a fixed plate of a test child device between a license plate and the vehicle, installing the child device at a specific position of the fixed plate, wherein the plane of the child device is the plane of the vehicle, and measuring a group of initial angles alpha by a gyroscope in the child devicex*、αy*、αzAs the angle between the plane coordinate system of the vehicle and the ground coordinate system, the gyroscope in the parent device also measures a set of initial angles αx**、αy**、αzThen, the included angle between the plane where the master device is located and the plane where the automobile is located, namely the plane where the slave device is located, is as follows:
ω＝αy**-αy*
κ＝αz**-αz*
6) the actual three-axis acceleration of the automobile can be obtained through left-side transformation of the acceleration measured by an accelerometer in the parent device, and the calculation relationship is as follows:
rotating the coordinate system of the mother device around the z axis by an angle k under the right-hand system:
rotation angle ω about y-axis:
rotation angle around x axis
Fusing the three-axis rotation into a rotation matrix:
Wherein each element is respectively:
therefore, the three-axis acceleration measured in the parent device can be converted into the three-axis acceleration under the automobile coordinate system, so that more accurate data can be provided for subsequent calculation, and the driving smoothness of the automobile can be better evaluated.
Stm32 is used as a calculation unit to obtain measurement data from a sensor so as to calculate the three-axis acceleration of a vehicle coordinate system, and finally, the weighted acceleration root mean square value when the automobile runs in a test is calculated according to the comfort weight in ISO 2631(1997) and is used as an evaluation index of the running smoothness of the automobile.
In summary, compared with the traditional automobile ride comfort detection method and device, the automobile ride comfort detection device has the advantage of small size and is convenient to carry. This product convenient to use, the step is simple, use the three-axis gyroscope to measure the contained angle between check out test set place coordinate system and the ground coordinate system, thereby carry out the angle correction to the data that linear accelerometer measured, thereby reachs triaxial acceleration data under the car coordinate system, consequently this product can install any angle in the inside any position of car when carrying out car ride comfort and detecting, and need not relative automobile body level and place, when having simplified car ride comfort greatly and measuring, the step of testing arrangement installation, convenient to use. The most important index of the smoothness test is taken as an evaluation parameter, and some minor parameters which have little influence on the human body are ignored, so that a non-professional person can test and evaluate the smoothness of the automobile according to the test flow of the product.
Claims (10)
1. The utility model provides a smooth testing arrangement of primary and secondary formula car which characterized in that: the device comprises a mother device (1) and a child device (2), wherein the mother device (1) is installed in a tested automobile, the child device (2) is installed outside the tested automobile and is parallel to the plane where an automobile body is located, the mother device (1) and the child device (2) are matched to measure the triaxial acceleration of the automobile, and the weighted acceleration root mean square value when the automobile is tested to run is calculated and serves as an evaluation index of the running smoothness of the automobile.
2. The ride comfort test device of a child-mother vehicle according to claim 1, characterized in that: the primary device (1) comprises a casing (11), a first battery (12) is arranged in the casing (11), a first voltage stabilizing module (13) and a first sensing test module (14) are arranged in the casing (11) on the upper side of the first battery (12), a first main control board (15) is arranged in the casings on the upper sides of the first voltage stabilizing module (13) and the first sensing test module (14), a top cover (16) is arranged on the casing on the upper side of the first main control board (15), an upper end opening of the casing (11) is sealed through the top cover (16), an output end of the battery is connected with a power input end of the first voltage stabilizing module (13), a power output end of the first voltage stabilizing module (13) is connected with the first main control board (15) and the power input end of the first sensing test module (14) and used for providing a working power supply for the primary device, the data output end of the first perception test module (14) is connected with the data input end of the first main control board (15).
3. The ride comfort test device of a child-mother vehicle according to claim 2, characterized in that: the first voltage stabilizing module (13) is provided with a charging interface (17), and the first battery (12) is charged through the charging interface (17).
4. The ride comfort test device of a child-mother vehicle according to claim 2, characterized in that: the first perception test module (14) is provided with a first USB data transmission interface (18), and the first USB data transmission interface (18) is used for outputting data collected by the first perception test module (14).
5. The ride comfort test device of a child-mother vehicle according to claim 2, characterized in that: the first perception test module (14) comprises a triaxial accelerometer, a gyroscope and a data output module, wherein the triaxial accelerometer and the gyroscope are connected with a signal input end of the data output module and used for measuring the angle of the acceleration ground and the ground coordinate system.
6. The ride comfort test device of a child-mother vehicle according to claim 1, characterized in that: the sub-device (2) comprises a fixed base (21), the fixed base (21) comprises a vertical part and a horizontal part, a machine base (22) is arranged on the horizontal part, a power supply and voltage stabilizing module (23) is arranged in the machine base (22), a data acquisition and transmission module (24) is arranged in the machine base on the upper side of the voltage stabilizing module (23), an organic top shell (25) is arranged on the machine base on the upper side of the transmission module, an upper end opening of the machine base (22) is sealed through the machine top shell (25), the voltage stabilizing device is used for providing a working power supply for the data acquisition and transmission module, and the data acquisition and transmission module is used for acquiring relevant data of an automobile plane coordinate system with a timestamp; the data acquisition and transmission module is provided with a second USB data transmission interface (26), the vertical part of the fixed base (21) is provided with a mounting hole (27), and the joint of the vertical part and the horizontal part of the fixed base (21) is provided with a reinforcing rib (28).
7. A method for testing using the ride comfort test apparatus of a parent-child vehicle according to any one of claims 1-6, comprising the steps of:
driving the tested automobile to the starting point of the test site;
pressing a power key to start the device and taking down the sub-device;
mounting a fixed base of the sub-device at a license plate fixing position, and mounting the sub-device on the fixed base;
fixing the master device at a saddle in a vehicle to be measured;
after the starting test is selected on the master device, the automobile starts to test a test site;
after the automobile is driven to the terminal, the selection test is finished;
taking down the child device and connecting the child device with the parent device through a USB interface;
selecting data input, and waiting for the end of data transmission;
and after the data transmission is finished, calculating the evaluation index of the running smoothness of the automobile according to the tested data, outputting the test result and finishing the test.
8. The method according to claim 7, wherein the vehicle ride performance evaluation index is calculated as follows:
the primary-secondary device configuration is used for correcting the three-axis acceleration of the automobile: driving the vehicle to a horizontal area of a test site, installing a test mother device at the positions of a driver seat, a driver bottom plate and the like, installing a fixing plate of a test child device between a license plate and the vehicle, and installing a child device at the fixing positionThe plate is at a specific position, the plane of the sub-device is the plane of the automobile, and the gyroscope in the sub-device measures a group of initial angles alphax*、αy*、αzAs the angle between the plane coordinate system of the vehicle and the ground coordinate system, the gyroscope in the parent device also measures a set of initial angles αx**、αy**、αzThen, the included angle between the plane where the master device is located and the plane where the automobile is located, namely the plane where the slave device is located, is as follows:
ω＝αy**-αy*
κ＝αz**-αz*
the actual three-axis acceleration of the automobile can be obtained through left-side transformation of the acceleration measured by an accelerometer in the parent device, and the calculation relationship is as follows:
rotating the coordinate system of the mother device around the z axis by an angle k under the right-hand system:
rotation angle ω about y-axis:
rotation angle around x axis
Fusing the three-axis rotation into a rotation matrix:
Wherein each element is respectively:
therefore, the triaxial acceleration measured in the parent device can be converted into the triaxial acceleration under the automobile coordinate system;
and finally, according to the comfort weight in ISO 2631(1997), calculating the weighted acceleration root mean square value when the automobile is tested to run as an evaluation index of the running smoothness of the automobile.
9. The method of claim 7, wherein: selecting different stm32 chips as the calculation cores of the primary and secondary devices; a surface mount type gyroscope and a linear accelerometer are arranged in the mother device and are positioned on the same circuit board so as to ensure that the surface mount type gyroscope and the linear accelerometer are always positioned on the same horizontal plane.
10. The method of claim 7, wherein: the power module and the measuring unit are designed into two circuit boards in the mother device so as to isolate the influence of large current on the test element; the fixing base of the sub-device arranged at the license plate is used for fixing the sub-device to be parallel to the plane of the automobile.
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