CN113607251B - Vehicle load measuring method and device - Google Patents
Vehicle load measuring method and device Download PDFInfo
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- CN113607251B CN113607251B CN202110764393.3A CN202110764393A CN113607251B CN 113607251 B CN113607251 B CN 113607251B CN 202110764393 A CN202110764393 A CN 202110764393A CN 113607251 B CN113607251 B CN 113607251B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G19/00—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups
- G01G19/08—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for incorporation in vehicles
- G01G19/086—Weighing apparatus or methods adapted for special purposes not provided for in the preceding groups for incorporation in vehicles wherein the vehicle mass is dynamically estimated
Abstract
The invention discloses a vehicle load measuring method and a device, wherein the method comprises the following steps: setting a first parameter of a vehicle to be tested according to the model of the vehicle to be tested; controlling the speed of the vehicle to be tested to reach a preset speed interval, acquiring a message from the vehicle-mounted CAN bus according to a preset sampling interval, and acquiring a second parameter according to the message; acquiring a third parameter of a road traveled by the vehicle to be tested from a vehicle-mounted CAN bus by combining a vehicle-mounted electronic map at preset sampling intervals; and carrying out digital filtering on the second parameter and the third parameter, and calculating the second parameter and the third parameter after the digital filtering by combining the first parameter to obtain the load value of the vehicle to be tested. According to the embodiment of the invention, the plurality of vehicle-mounted bus data of the vehicle to be measured are used as the calculation basis for measuring and measuring the load, and the load measurement is carried out without calibrating for a plurality of times according to different vehicle types and installing the strain gauge on the vehicle frame, so that the method is applicable to various vehicle types, and the measuring efficiency and the testing accuracy of the vehicle load can be effectively improved.
Description
Technical Field
The invention relates to the technical field of load detection, in particular to a vehicle load measuring method and device.
Background
The current vehicle load measurement is to install the strain gauge near the suspension of the vehicle, under different load conditions, the strain gauge can generate different deformations, the resistance characteristic of the strain gauge is attached to the load to change, and the strain gauge is connected to the bridge measurement circuit to obtain different voltage outputs so as to represent different load data. However, in the existing vehicle load measuring method, the strain gauge needs to be installed on the frame, and the performance of the strain gauge is rapidly reduced or even damaged in the exposed environment, so that the load measuring error of the vehicle is overlarge or cannot be measured.
Disclosure of Invention
The invention provides a vehicle load measuring method and device, which are used for solving the problems that the performance of a strain gauge is easy to damage, and the load measuring error of a vehicle is overlarge or cannot be measured in the existing vehicle load measuring method.
One embodiment of the present invention provides a vehicle load measuring method including:
setting a first parameter of a vehicle to be tested according to the model of the vehicle to be tested, restarting the vehicle to be tested, and loading the first parameter, wherein the first parameter comprises a transmission ratio of a main speed reducer, a wheel radius, an air resistance coefficient, a windward area, an automobile rotating mass conversion coefficient and mechanical efficiency of a transmission system;
controlling the speed of the vehicle to be tested to reach a preset speed interval, acquiring a message from a vehicle-mounted CAN bus according to a preset sampling interval, and acquiring a second parameter according to the message, wherein the second parameter comprises engine output torque, running speed, running acceleration and transmission ratio;
acquiring a third parameter of a road traveled by the vehicle to be tested from the vehicle-mounted CAN bus by combining a vehicle-mounted electronic map at the preset sampling interval, wherein the third parameter comprises a rolling resistance coefficient and a gradient angle;
and carrying out digital filtering on the second parameter and the third parameter, and calculating the second parameter and the third parameter after digital filtering by combining the first parameter to obtain the load value of the vehicle to be tested.
Further, the calculating the load value of the vehicle to be tested by combining the second parameter and the third parameter after the digital filtering with the first parameter specifically includes:
combining the second parameter and the third parameter after digital filtering with the first parameter to obtain a running equation:
wherein T is tq I is the output torque of the engine g I is the transmission ratio, i o Is the transmission ratio of the main speed reducer, eta is the mechanical efficiency of the transmission system, r is the radius of wheels, m is the load value of the vehicle to be tested, g is the gravitational acceleration, f is the rolling resistance coefficient, alpha is the gradient angle, C D Is the air resistance coefficient, A is the windward area, u a The vehicle speed is the running acceleration, a is the running acceleration, and delta is the conversion coefficient of the rotating mass of the vehicle;
and calculating to obtain the load value of the vehicle to be tested according to the running equation and the values of the first parameter, the second parameter and the third parameter.
Further, an arithmetic average filtering method is adopted to carry out digital filtering on the second parameter and the third parameter.
Further, a median filtering method is adopted to carry out digital filtering on the second parameter and the third parameter.
Further, dividing the difference between the current running speed of the vehicle to be tested and the running speed of the previous sampling interval by the preset sampling interval to calculate and obtain the running acceleration of the vehicle to be tested.
Further, the interval of the preset sampling interval is 0.01 seconds to 0.1 seconds.
Further, the preset vehicle speed interval is from 35 km per hour to 45 km per hour.
Another embodiment of the present invention provides a vehicle load measuring device including:
the first parameter loading module is used for setting a first parameter of the vehicle to be tested according to the model of the vehicle to be tested, restarting the vehicle to be tested and loading the first parameter, wherein the first parameter comprises the transmission ratio of the main speed reducer, the radius of wheels, the air resistance coefficient, the windward area, the conversion coefficient of the rotating mass of the automobile and the mechanical efficiency of a transmission system;
the second parameter acquisition module is used for controlling the speed of the vehicle to be detected to reach a preset speed interval, acquiring a message from a vehicle-mounted CAN bus according to a preset sampling interval, and acquiring a second parameter according to the message, wherein the second parameter comprises engine output torque, running speed, running acceleration and transmission ratio;
the third parameter acquisition module is used for acquiring a third parameter of a road traveled by the vehicle to be tested from the vehicle-mounted CAN bus by combining a vehicle-mounted electronic map at the preset sampling interval, wherein the third parameter comprises a rolling resistance coefficient and a gradient angle;
and the vehicle load calculation module is used for carrying out digital filtering on the second parameter and the third parameter, and calculating the load value of the vehicle to be detected by combining the second parameter and the third parameter after the digital filtering with the first parameter.
According to the embodiment of the invention, the plurality of vehicle-mounted bus data of the vehicle to be tested are used as the calculation basis for measuring and measuring the load, and the relation between the vehicle-mounted bus data and the vehicle load value is constructed through the first parameter, the second parameter and the third parameter, so that the load value of the vehicle to be tested is calculated and obtained based on the relation, multiple calibration according to different vehicle types is not needed, the vehicle-mounted bus data measuring device is applicable to various vehicle types, and the measuring efficiency and the measuring accuracy of the vehicle load can be effectively improved; according to the embodiment of the invention, the load measurement is carried out without installing the strain gauge on the vehicle frame, so that the problem that the measurement error is overlarge or the measurement cannot be carried out because the strain gauge is reduced or damaged due to the performance of the strain gauge can be avoided, and the reliability and the stability of the load measurement can be effectively improved.
Drawings
FIG. 1 is a schematic flow chart of a method for measuring a load of a vehicle according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a vehicle load measuring device according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the description of the present application, it should be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or an implicit indication of the number of technical features being indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art in a specific context.
Referring to fig. 1, in a first embodiment of the present invention, there is provided a vehicle load measuring method as shown in fig. 1, including:
s1, setting a first parameter of a vehicle to be tested according to the model of the vehicle to be tested, restarting the vehicle to be tested, and loading the first parameter, wherein the first parameter comprises the transmission ratio of a main speed reducer, the radius of wheels, the air resistance coefficient, the windward area, the conversion coefficient of the rotating mass of an automobile and the mechanical efficiency of a transmission system;
optionally, parameters such as a vehicle body structure, a wheel size, a transmission system and a power device of different types of vehicles are different, and different parameters have different effects on subsequent calculation of a subsequent vehicle load. After the first parameter is set, in order to enable the fixed program of the updated parameter to load the set first parameter, the embodiment of the invention restarts the vehicle to be tested, and after restarting, the data on the RAM of the vehicle to be tested is automatically emptied and the set first parameter is reloaded.
In a specific embodiment, the vehicle to be tested according to the embodiment of the invention is a commercial vehicle.
S2, controlling the speed of the vehicle to be tested to reach a preset speed interval, acquiring a message from a vehicle-mounted CAN bus according to a preset sampling interval, and acquiring a second parameter according to the message, wherein the second parameter comprises the output torque of an engine, the running speed, the running acceleration and the transmission ratio of a transmission;
optionally, in order to enable the engine to perform a test under a stable working condition, the embodiment of the invention enables the running working condition and the output torque of the engine to be stable by controlling the speed of the vehicle to be tested to reach a preset speed interval, thereby being capable of effectively improving the accuracy of the acquired second parameter and being beneficial to improving the accuracy and the stability of the subsequent calculation of the load of the vehicle.
S3, acquiring a third parameter of a road on which the vehicle to be tested runs from a vehicle-mounted CAN bus by combining a vehicle-mounted electronic map at preset sampling intervals, wherein the third parameter comprises a rolling resistance coefficient and a gradient angle;
it should be noted that the vehicle-mounted electronic map includes a specific road condition of the vehicle to be tested on the driving road, and has a GPS positioning function, and according to the embodiment of the invention, specific road condition information of the vehicle to be tested in the driving process can be accurately obtained through GPS positioning, and in combination with the vehicle-mounted electronic map, a third parameter of the driving road of the vehicle to be tested can be obtained from the vehicle-mounted bus, wherein the third parameter includes a rolling resistance coefficient and a gradient angle.
And S4, carrying out digital filtering on the second parameter and the third parameter, and calculating the second parameter and the third parameter after the digital filtering by combining the first parameter to obtain the load value of the vehicle to be tested.
In the embodiment of the invention, the second parameter and the third parameter are filtered in a digital filtering mode, so that the influence of interference or noise on the parameters can be effectively eliminated, the accuracy and the reliability of parameter acquisition are improved, and the accuracy and the reliability of vehicle load measurement are improved.
As a specific implementation manner of the embodiment of the present invention, the load value of the vehicle to be tested is obtained by calculating the second parameter and the third parameter after digital filtering in combination with the first parameter, specifically:
combining the digitally filtered second parameter and third parameter with the first parameter to obtain a running equation:
wherein T is tq I is the output torque of the engine g I is the transmission ratio, i o Is the transmission ratio of the main speed reducer, eta is the mechanical efficiency of the transmission system, r is the radius of wheels, m is the load value of the vehicle to be tested, g is the gravitational acceleration, f is the rolling resistance coefficient, alpha is the gradient angle,C D is the air resistance coefficient, A is the windward area, u a The vehicle speed is the running acceleration, a is the running acceleration, and delta is the conversion coefficient of the rotating mass of the vehicle;
in a specific embodiment, the commercial vehicle is usually in a constant-speed cruising state in which the acceleration of the vehicle is theoretically zero when the highway is running, and the above running equation is simplified to the following expression:
for example, highway driving is a common operation mode of commercial vehicles, the driving speed is generally from 70 km/h to 120 km/h, and because the highway has good road conditions, a good asphalt pavement is generally obtained, the rolling resistance coefficient is smaller, and the gradient is also smaller. In order to improve the running safety of the vehicle, the value range of the rolling resistance coefficient is 0.01 to 0.015, and the value range of the gradient angle is 0.1 to 1.5 degrees.
And calculating according to the running equation and the values of the first parameter, the second parameter and the third parameter to obtain the load value of the vehicle to be tested.
Exemplary gravitational acceleration takes on a value of 9.8m/s 2 . According to the embodiment of the invention, the plurality of vehicle-mounted bus data of the vehicle to be detected are used as the calculation basis, and the relation between the vehicle-mounted bus data and the vehicle load value, namely the running equation, is constructed through the first parameter, the second parameter and the third parameter, and the load value of the vehicle to be detected is calculated based on the running equation. According to the embodiment of the invention, the related structure of the vehicle configuration is not needed to be considered, the measurement of the vehicle load is realized based on the running working condition of the vehicle, multiple calibration is not needed according to different vehicle types, the method and the device are applicable to various vehicle types, and the measurement efficiency and the test accuracy of the vehicle load can be effectively improved at the same time.
As a specific implementation manner of the embodiment of the present invention, an arithmetic average filtering method is adopted to digitally filter the second parameter and the third parameter, or a median filtering method is adopted to digitally filter the second parameter and the third parameter.
As a specific implementation manner of the embodiment of the invention, the difference between the current running speed of the vehicle to be tested and the running speed of the previous sampling interval is divided by the preset sampling interval to calculate and obtain the running acceleration of the vehicle to be tested.
As a specific implementation manner of the embodiment of the present invention, the interval of the preset sampling interval is 0.01 seconds to 0.1 seconds.
In an embodiment of the present invention, the preset sampling interval may be determined by analysis of multiple measurement data.
As a specific implementation manner of the embodiment of the invention, the preset vehicle speed interval is 35 km per hour to 45 km per hour.
In the embodiment of the invention, the value of the preset vehicle speed interval is determined according to the stable operation condition of the engine, so that the problem of large measurement error caused by unstable operation working condition and output torque of the engine when the vehicle speed is low can be effectively avoided, and the measurement stability can be effectively improved.
The embodiment of the invention has the following beneficial effects:
according to the embodiment of the invention, a plurality of vehicle-mounted bus data of the vehicle to be detected are used as calculation basis, and a relation between the vehicle-mounted bus data and the vehicle load value, namely a running equation is constructed through the first parameter, the second parameter and the third parameter, and the load value of the vehicle to be detected is calculated based on the running equation; according to the embodiment of the invention, the load measurement is carried out without installing the strain gauge on the frame, so that the problem that the measurement error is overlarge or the measurement cannot be carried out because the strain gauge is reduced or damaged due to the performance of the strain gauge can be avoided, and the reliability and the stability of the load measurement can be effectively improved; according to the embodiment of the invention, the related structure of the vehicle configuration is not needed to be considered, the measurement of the vehicle load is realized based on the running working condition of the vehicle, multiple calibration is not needed according to different vehicle types, the method and the device are applicable to various vehicle types, and the measurement efficiency and the test accuracy of the vehicle load can be effectively improved at the same time.
Referring to fig. 2, a second embodiment of the present invention provides a vehicle load measuring device, including:
the first parameter loading module 10 is configured to set a first parameter of the vehicle to be tested according to a model of the vehicle to be tested, restart the vehicle to be tested, and load the first parameter, where the first parameter includes a transmission ratio of the main speed reducer, a wheel radius, an air resistance coefficient, a windward area, a conversion coefficient of rotational mass of the vehicle, and mechanical efficiency of a transmission system;
optionally, parameters such as a vehicle body structure, a wheel size, a transmission system and a power device of different types of vehicles are different, and different parameters have different effects on subsequent calculation of a subsequent vehicle load. After the first parameter is set, in order to enable the fixed program of the updated parameter to load the set first parameter, the embodiment of the invention restarts the vehicle to be tested, and after restarting, the data on the RAM of the vehicle to be tested is automatically emptied and the set first parameter is reloaded.
In a specific embodiment, the vehicle to be tested according to the embodiment of the invention is a commercial vehicle.
The second parameter obtaining module 20 is configured to control a vehicle speed of the vehicle to be tested to reach a preset vehicle speed interval, obtain a message from the vehicle-mounted CAN bus according to a preset sampling interval, and obtain a second parameter according to the message, where the second parameter includes an engine output torque, a running vehicle speed, a running acceleration and a transmission ratio;
optionally, in order to enable the engine to perform a test under a stable working condition, the embodiment of the invention enables the running working condition and the output torque of the engine to be stable by controlling the speed of the vehicle to be tested to reach a preset speed interval, thereby being capable of effectively improving the accuracy of the acquired second parameter and being beneficial to improving the accuracy and the stability of the subsequent calculation of the load of the vehicle.
A third parameter obtaining module 30, configured to obtain, at a preset sampling interval, a third parameter of a road traveled by the vehicle to be tested from a vehicle-mounted CAN bus in combination with a vehicle-mounted electronic map, where the third parameter includes a rolling resistance coefficient and a gradient angle;
it should be noted that the vehicle-mounted electronic map includes a specific road condition of the vehicle to be tested on the driving road, and has a GPS positioning function, and according to the embodiment of the invention, specific road condition information of the vehicle to be tested in the driving process can be accurately obtained through GPS positioning, and in combination with the vehicle-mounted electronic map, a third parameter of the driving road of the vehicle to be tested can be obtained from the vehicle-mounted bus, wherein the third parameter includes a rolling resistance coefficient and a gradient angle.
The vehicle load calculation module 40 is configured to digitally filter the second parameter and the third parameter, and calculate the load value of the vehicle to be tested by combining the digitally filtered second parameter and the digitally filtered third parameter with the first parameter.
In the embodiment of the invention, the second parameter and the third parameter are filtered in a digital filtering mode, so that the influence of interference or noise on the parameters can be effectively eliminated, the accuracy and the reliability of parameter acquisition are improved, and the accuracy and the reliability of vehicle load measurement are improved.
As a specific implementation of the embodiment of the present invention, the vehicle load calculation module 40 is specifically configured to:
combining the digitally filtered second parameter and third parameter with the first parameter to obtain a running equation:
wherein T is tq I is the output torque of the engine g I is the transmission ratio, i o Is the transmission ratio of the main speed reducer, eta is the mechanical efficiency of the transmission system, r is the radius of wheels, m is the load value of the vehicle to be tested, g is the gravitational acceleration, f is the rolling resistance coefficient, alpha is the gradient angle, C D Is the air resistance coefficient, A is the windward area, u a The vehicle speed is the running acceleration, a is the running acceleration, and delta is the conversion coefficient of the rotating mass of the vehicle;
in a specific embodiment, the commercial vehicle is usually in a constant-speed cruising state in which the acceleration of the vehicle is theoretically zero when the highway is running, and the above running equation is simplified to the following expression:
for example, highway driving is a common operation mode of commercial vehicles, the driving speed is generally from 70 km/h to 120 km/h, and because the highway has good road conditions, a good asphalt pavement is generally obtained, the rolling resistance coefficient is smaller, and the gradient is also smaller. In order to improve the running safety of the vehicle, the value range of the rolling resistance coefficient is 0.01 to 0.015, and the value range of the gradient angle is 0.1 to 1.5 degrees.
And calculating according to the running equation and the values of the first parameter, the second parameter and the third parameter to obtain the load value of the vehicle to be tested.
Exemplary gravitational acceleration takes on a value of 9.8m/s 2 . According to the embodiment of the invention, the plurality of vehicle-mounted bus data of the vehicle to be detected are used as the calculation basis, and the relation between the vehicle-mounted bus data and the vehicle load value, namely the running equation, is constructed through the first parameter, the second parameter and the third parameter, and the load value of the vehicle to be detected is calculated based on the running equation. According to the embodiment of the invention, the related structure of the vehicle configuration is not needed to be considered, the measurement of the vehicle load is realized based on the running working condition of the vehicle, multiple calibration is not needed according to different vehicle types, the method and the device are applicable to various vehicle types, and the measurement efficiency and the test accuracy of the vehicle load can be effectively improved at the same time.
As a specific implementation manner of the embodiment of the present invention, an arithmetic average filtering method is adopted to digitally filter the second parameter and the third parameter, or a median filtering method is adopted to digitally filter the second parameter and the third parameter.
As a specific implementation manner of the embodiment of the invention, the difference between the current running speed of the vehicle to be tested and the running speed of the previous sampling interval is divided by the preset sampling interval to calculate and obtain the running acceleration of the vehicle to be tested.
As a specific implementation manner of the embodiment of the present invention, the interval of the preset sampling interval is 0.01 seconds to 0.1 seconds.
In an embodiment of the present invention, the preset sampling interval may be determined by analysis of multiple measurement data.
As a specific implementation manner of the embodiment of the invention, the preset vehicle speed interval is 35 km per hour to 45 km per hour.
In the embodiment of the invention, the value of the preset vehicle speed interval is determined according to the stable operation condition of the engine, so that the problem of large measurement error caused by unstable operation working condition and output torque of the engine when the vehicle speed is low can be effectively avoided, and the measurement stability can be effectively improved.
The embodiment of the invention has the following beneficial effects:
according to the embodiment of the invention, a plurality of vehicle-mounted bus data of the vehicle to be detected are used as calculation basis, and a relation between the vehicle-mounted bus data and the vehicle load value, namely a running equation is constructed through the first parameter, the second parameter and the third parameter, and the load value of the vehicle to be detected is calculated based on the running equation; according to the embodiment of the invention, the load measurement is carried out without installing the strain gauge on the frame, so that the problem that the measurement error is overlarge or the measurement cannot be carried out because the strain gauge is reduced or damaged due to the performance of the strain gauge can be avoided, and the reliability and the stability of the load measurement can be effectively improved; according to the embodiment of the invention, the related structure of the vehicle configuration is not needed to be considered, the measurement of the vehicle load is realized based on the running working condition of the vehicle, multiple calibration is not needed according to different vehicle types, the method and the device are applicable to various vehicle types, and the measurement efficiency and the test accuracy of the vehicle load can be effectively improved at the same time.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (8)
1. A vehicle load measuring method, characterized by comprising:
setting a first parameter of a vehicle to be tested according to the model of the vehicle to be tested, restarting the vehicle to be tested, and loading the first parameter, wherein the first parameter comprises a transmission ratio of a main speed reducer, a wheel radius, an air resistance coefficient, a windward area, an automobile rotating mass conversion coefficient and mechanical efficiency of a transmission system;
the speed of the vehicle to be tested is controlled to reach a preset speed interval, a message is acquired from a vehicle-mounted CAN bus according to a preset sampling interval, and a second parameter is acquired according to the message, wherein the controlling the speed of the vehicle to be tested to reach the preset speed interval comprises the following steps: determining the value of the preset vehicle speed interval according to the operation condition and the output torque of the engine of the vehicle to be tested, so that the operation condition and the output torque of the engine are stable; the second parameters include engine output torque, travel speed, travel acceleration, and transmission gear ratio;
acquiring a third parameter of a road traveled by the vehicle to be tested from the vehicle-mounted CAN bus by combining a vehicle-mounted electronic map at the preset sampling interval, wherein the third parameter comprises a rolling resistance coefficient and a gradient angle;
and carrying out digital filtering on the second parameter and the third parameter, and calculating the second parameter and the third parameter after digital filtering by combining the first parameter to obtain the load value of the vehicle to be tested.
2. The vehicle load measuring method according to claim 1, wherein the calculating the load value of the vehicle to be measured by combining the second parameter and the third parameter after the digital filtering with the first parameter is specifically as follows:
combining the second parameter and the third parameter after digital filtering with the first parameter to obtain a running equation:
wherein T is tq I is the output torque of the engine g I is the transmission ratio, i o Is the transmission ratio of the main speed reducer, eta is the mechanical efficiency of the transmission system, r is the radius of wheels, m is the load value of the vehicle to be tested, g is the gravitational acceleration, f is the rolling resistance coefficient, alpha is the gradient angle, C D Is the air resistance coefficient, A is the windward area, u a The vehicle speed is the running acceleration, a is the running acceleration, and delta is the conversion coefficient of the rotating mass of the vehicle;
and calculating to obtain the load value of the vehicle to be tested according to the running equation and the values of the first parameter, the second parameter and the third parameter.
3. The vehicle load measurement method of claim 1, wherein the second parameter and the third parameter are digitally filtered using an arithmetic average filtering method.
4. The vehicle load measurement method according to claim 1, characterized in that the second parameter and the third parameter are digitally filtered using a median filtering method.
5. The vehicle load measuring method according to claim 1, wherein the running acceleration of the vehicle to be measured is calculated by dividing the difference between the current running speed of the vehicle to be measured and the running speed of the preceding sampling interval by the preset sampling interval.
6. The vehicle load measuring method according to claim 1, wherein the interval of the preset sampling interval is 0.01 seconds to 0.1 seconds.
7. The vehicle load measuring method according to claim 1, wherein the preset vehicle speed section is 35 km per hour to 45 km per hour.
8. A vehicle load measuring device, characterized by comprising:
the first parameter loading module is configured to set a first parameter of a vehicle to be tested according to a model of the vehicle to be tested, restart the vehicle to be tested, and load the first parameter, wherein controlling a speed of the vehicle to be tested to reach a preset speed interval comprises: determining the value of the preset vehicle speed interval according to the operation condition and the output torque of the engine of the vehicle to be tested, so that the operation condition and the output torque of the engine are stable; the first parameters comprise the transmission ratio of the main speed reducer, the wheel radius, the air resistance coefficient, the windward area, the conversion coefficient of the rotating mass of the automobile and the mechanical efficiency of the transmission system;
a second parameter obtaining module, configured to control a vehicle speed of the vehicle to be tested to reach a preset vehicle speed interval, obtain a message from a vehicle-mounted CAN bus according to a preset sampling interval, obtain a second parameter according to the message, wherein,
the second parameters include engine output torque, travel speed, travel acceleration, and transmission gear ratio;
the third parameter acquisition module is used for acquiring a third parameter of a road traveled by the vehicle to be tested from the vehicle-mounted CAN bus by combining a vehicle-mounted electronic map at the preset sampling interval, wherein the third parameter comprises a rolling resistance coefficient and a gradient angle;
and the vehicle load calculation module is used for carrying out digital filtering on the second parameter and the third parameter, and calculating the load value of the vehicle to be detected by combining the second parameter and the third parameter after the digital filtering with the first parameter.
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| CN114877981B (en) * | 2022-04-26 | 2023-10-31 | 东风柳州汽车有限公司 | Method and device for measuring tire load |
| CN114954494B (en) * | 2022-06-14 | 2024-03-26 | 广西玉柴机器股份有限公司 | Heavy commercial vehicle load rapid estimation method |
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