CN112051073A - Vehicle transmission resistance measuring method, vehicle transmission resistance measuring system and vehicle transmission resistance measuring storage medium - Google Patents
Vehicle transmission resistance measuring method, vehicle transmission resistance measuring system and vehicle transmission resistance measuring storage medium Download PDFInfo
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- CN112051073A CN112051073A CN202010882333.7A CN202010882333A CN112051073A CN 112051073 A CN112051073 A CN 112051073A CN 202010882333 A CN202010882333 A CN 202010882333A CN 112051073 A CN112051073 A CN 112051073A
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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
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- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
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Abstract
The invention discloses a vehicle transmission resistance measuring method, a vehicle transmission resistance testing system and a storage medium, wherein torque sensors are arranged on an engine flywheel, a gearbox output end shaft, a left half shaft, a right half shaft and a brake disc of a test vehicle, and the method comprises the following steps: respectively obtaining gearbox resistance, left half shaft resistance, right half shaft resistance, brake disc resistance and total transmission resistance of each vehicle speed according to engine output torque, gearbox output torque, left half shaft output torque, right half shaft output torque and brake disc output torque, flywheel radius, gearbox output end shaft radius, left half shaft radius, right half shaft radius and brake disc radius which are collected by each torque sensor in the process of uniform speed operation at each vehicle speed; according to the resistance of the gearbox, the resistance of the left half shaft and the right half shaft, the resistance of the brake disc and the total transmission resistance of each vehicle speed, a relation curve between the resistance of the gearbox, the resistance of the left half shaft and the right half shaft, the resistance of the brake disc and the total transmission resistance and the vehicle speed is obtained. The invention solves the problem of complicated resistance test process of the existing transmission system.
Description
Technical Field
The invention relates to the field of vehicle testing, in particular to a vehicle transmission resistance measuring method, a vehicle transmission resistance measuring system and a computer readable storage medium.
Background
The core performance of the automobile is that the whole automobile power economy is closely related to the whole automobile resistance, the whole automobile resistance mainly comprises external resistance, namely rolling resistance, air resistance, acceleration and gradient resistance, and internal resistance, namely transmission system resistance, and the whole automobile resistance of the automobile is not high when the automobile speed is not high, so the internal resistance is particularly important. The premise for optimizing the resistance of the transmission system is that the resistance of each part of the transmission system needs to be tested. The conventional method for testing the resistance of the transmission system is a step-by-step disassembly method, all parts of the transmission system of a vehicle need to be disassembled in sequence, and the whole process is complicated.
Disclosure of Invention
The invention mainly aims to provide a vehicle transmission resistance measuring method, a vehicle transmission resistance measuring system and a computer readable storage medium, and aims to solve the problem that the existing transmission system resistance measuring method is complicated in testing process.
In order to achieve the above object, the present invention provides a method for measuring vehicle transmission resistance, wherein torque sensors are respectively mounted on an engine flywheel, a transmission output shaft, a left half shaft, a right half shaft and a brake disc of a test vehicle, and the method for measuring vehicle transmission resistance comprises the following steps:
controlling the test vehicle to run at a constant speed under a plurality of vehicle speeds respectively;
the method comprises the steps that engine output torque, gearbox output torque, left half shaft output torque, right half shaft output torque and brake disc output torque which are correspondingly collected by torque sensors on an engine flywheel, a gearbox output end shaft, a left half shaft, a right half shaft and a brake disc in the process that a test vehicle runs at a constant speed at each speed are obtained;
according to the flywheel radius, the shaft radius of the output end of the gearbox, the radius of a left half shaft, the radius of a right half shaft and the radius of a brake disc of a test vehicle, and the engine output torque, the gearbox output torque, the left half shaft output torque, the right half shaft output torque and the brake disc output torque corresponding to each vehicle speed, obtaining the gearbox resistance, the left half shaft resistance, the right half shaft resistance, the brake disc resistance and the total transmission resistance corresponding to each vehicle speed;
and obtaining a relation curve between the gearbox resistance, the left and right half shaft resistance, the brake disc resistance and the total transmission resistance of the test vehicle and the vehicle speed respectively according to the gearbox resistance, the left and right half shaft resistance, the brake disc resistance and the total transmission resistance corresponding to the vehicle speeds.
Optionally, the step of obtaining the transmission resistance, the left and right axle shaft resistances, the brake disc resistance and the total transmission resistance corresponding to each vehicle speed according to the flywheel radius, the transmission output shaft radius, the left axle shaft radius, the right axle shaft radius, the brake disc radius of the test vehicle, and the engine output torque, the transmission output torque, the left axle shaft output torque, the right axle shaft output torque and the brake disc output torque corresponding to each vehicle speed includes:
obtaining gearbox resistance corresponding to each speed according to the engine output torque corresponding to each speed, the gearbox output torque corresponding to each speed, the flywheel radius of the test vehicle and the gearbox output end shaft radius of the test vehicle;
obtaining left and right half shaft resistance corresponding to each vehicle speed according to the transmission output torque corresponding to each vehicle speed, the left half shaft output torque corresponding to each vehicle speed, the right half shaft output torque corresponding to each vehicle speed, the shaft radius of the transmission output end of the test vehicle, the left half shaft radius of the test vehicle and the right half shaft radius of the test vehicle;
obtaining brake disc resistance corresponding to each vehicle speed according to the left half-shaft output torque corresponding to each vehicle speed, the right half-shaft output torque corresponding to each vehicle speed, the brake disc output torque corresponding to each vehicle speed, the left half-shaft radius of the test vehicle, the right half-shaft radius of the test vehicle and the brake disc radius of the test vehicle;
and obtaining the total transmission resistance corresponding to each vehicle speed according to the engine output torque corresponding to each vehicle speed, the brake disc output torque corresponding to each vehicle speed, the flywheel radius of the test vehicle and the brake disc radius of the test vehicle.
Optionally, the step of obtaining the gearbox resistance corresponding to each vehicle speed according to the engine output torque corresponding to each vehicle speed, the gearbox output torque corresponding to each vehicle speed, the flywheel radius of the test vehicle, and the gearbox output end shaft radius of the test vehicle includes:
calculating the gearbox resistance corresponding to each speed according to a preset gearbox resistance calculation formula, the engine output torque corresponding to each speed, the gearbox output torque corresponding to each speed, the flywheel radius of the test vehicle and the gearbox output end shaft radius of the test vehicle, wherein the preset gearbox resistance calculation formula is as follows:
f change is T hair multiplied by R fly-T change multiplied by R change,
wherein, FHalf ofGearbox drag, T, for the same speedHair-like deviceEngine output torque, T, for the same vehicle speedBecomeAnd outputting the torque for the gearbox corresponding to the same speed, wherein R fly is the radius of a flywheel disc of the test vehicle, and R becomes the radius of a gearbox output end shaft of the test vehicle.
Optionally, the step of obtaining the left and right axle resistances corresponding to the respective vehicle speeds according to the transmission output torque corresponding to the respective vehicle speeds, the left axle output torque corresponding to the respective vehicle speeds, the right axle output torque corresponding to the respective vehicle speeds, the transmission output shaft radius of the test vehicle, the left axle radius of the test vehicle, and the right axle radius of the test vehicle includes:
calculating left and right half axle resistances corresponding to the speeds according to a preset left and right half axle resistance calculation formula, the gearbox output torque corresponding to each speed, the left half axle output torque corresponding to each speed, the right half axle output torque corresponding to each speed, the gearbox output end shaft radius of the test vehicle, the left half axle radius of the test vehicle and the right half axle radius of the test vehicle, wherein the preset left and right half axle resistance calculation formula is as follows:
Fhalf of＝TBecome×RBecome-TLeft side of×RLeft side of-TLeft side of×RLeft side of，
Wherein, FHalf ofLeft and right half-axle resistances, T, corresponding to the same vehicle speedBecomeFor the same speed of the vehicleLeft side ofLeft half-axle output torque, T, for the same vehicle speedRight sideThe torque is output by the right half shaft corresponding to the same speed, R is the radius of the shaft at the output end of the gearbox of the test vehicle, RLeft side ofTo test the left axle shaft radius of a vehicle, RRight sideTo test the right half-axis radius of the vehicle.
Optionally, the step of obtaining the brake disc resistance corresponding to each vehicle speed according to the left half-shaft output torque corresponding to each vehicle speed, the right half-shaft output torque corresponding to each vehicle speed, the brake disc output torque corresponding to each vehicle speed, the left half-shaft radius of the test vehicle, the right half-shaft radius of the test vehicle, and the brake disc radius of the test vehicle includes:
calculating the brake disc resistance corresponding to each vehicle speed according to a preset brake disc resistance calculation formula, the left half-shaft output torque corresponding to each vehicle speed, the right half-shaft output torque corresponding to each vehicle speed, the brake disc output torque corresponding to each vehicle speed, the left half-shaft radius of the test vehicle, the right half-shaft radius of the test vehicle and the brake disc radius of the test vehicle, wherein the preset brake disc resistance calculation formula is as follows:
Fsystem for making＝TLeft side of×RLeft side of+TLeft side of×RLeft side of-TSystem for making×RSystem for making，
Wherein, FSystem for makingBrake disc resistance, T, for the same vehicle speedSystem for makingBrake disc output torque, T, for the same vehicle speedLeft side ofLeft half-axle output torque, T, for the same vehicle speedRight sideThe right half shaft outputs torque R corresponding to the same vehicle speedSystem for makingFor testing the brake disc radius of a vehicle, RLeft side ofTo test the left axle shaft radius of a vehicle, RRight sideTo test the right half-axis radius of the vehicle.
Optionally, the step of obtaining the total transmission resistance corresponding to each vehicle speed according to the engine output torque corresponding to each vehicle speed, the brake disc output torque corresponding to each vehicle speed, the flywheel radius of the test vehicle, and the brake disc radius of the test vehicle includes:
calculating the total transmission resistance corresponding to each vehicle speed according to a preset total transmission resistance calculation formula, the engine output torque corresponding to each vehicle speed, the brake disc output torque corresponding to each vehicle speed, the flywheel radius of the test vehicle and the brake disc radius of the test vehicle, wherein the preset total transmission resistance calculation formula is as follows:
Fgeneral assembly＝THair-like device×RFly away-TSystem for making×RSystem for making，
Wherein, FGeneral assemblyTotal transmission resistance, T, for the same vehicle speedHair-like deviceEngine output torque, T, for the same vehicle speedBecomeThe torque is output for the brake disc corresponding to the same speed, R fly is the radius of the flywheel disc of the test vehicle, R flyBecomeTo test the brake disc radius of the vehicle.
Optionally, before the step of obtaining a relationship curve between the transmission resistance, the left and right axle resistances, the brake disc resistance, and the total transmission resistance of the test vehicle and the vehicle speed according to the transmission resistance, the left and right axle resistances, the brake disc resistance, and the total transmission resistance corresponding to each vehicle speed, the method further includes:
judging whether the gearbox resistance, the left half shaft resistance, the right half shaft resistance and the brake disc resistance corresponding to each vehicle speed are all larger than 0;
and if so, executing the step of obtaining the relationship curves between the gearbox resistance, the left and right half-axle resistance, the brake disc resistance and the total transmission resistance of the test vehicle and the vehicle speed respectively according to the gearbox resistance, the left and right half-axle resistance, the brake disc resistance and the total transmission resistance corresponding to each vehicle speed.
Optionally, before the step of controlling the test vehicle to run at a constant speed at a plurality of vehicle speeds, the method further includes:
and calibrating the torque sensor, and respectively installing the calibrated torque sensor on an engine flywheel, a gearbox output end shaft, a left half shaft, a right half shaft and a brake disc of the test vehicle.
To achieve the above object, the present invention also provides a test system comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program, when executed by the processor, implementing the steps of the vehicle transmission resistance measurement method as described above.
To achieve the above object, the present invention also provides a computer-readable storage medium having stored thereon a computer program which, when being executed by a processor, realizes the steps of the vehicle driving resistance measurement method as described above.
The invention provides a vehicle transmission resistance measuring method, a testing system and a computer readable storage medium.A torque sensor is respectively arranged on an engine flywheel, a gearbox output end shaft, a left half shaft, a right half shaft and a brake disc of a testing vehicle, and the testing vehicle is controlled to respectively run at a constant speed under a plurality of vehicle speeds; the method comprises the steps that engine output torque, gearbox output torque, left half shaft output torque, right half shaft output torque and brake disc output torque which are correspondingly collected by torque sensors on an engine flywheel, a gearbox output end shaft, a left half shaft, a right half shaft and a brake disc in the process that a test vehicle runs at a constant speed at each speed are obtained; according to the flywheel radius, the shaft radius of the output end of the gearbox, the radius of a left half shaft, the radius of a right half shaft and the radius of a brake disc of a test vehicle, and the engine output torque, the gearbox output torque, the left half shaft output torque, the right half shaft output torque and the brake disc output torque corresponding to each vehicle speed, obtaining the gearbox resistance, the left half shaft resistance, the right half shaft resistance, the brake disc resistance and the total transmission resistance corresponding to each vehicle speed; and obtaining a relation curve between the gearbox resistance, the left and right half shaft resistance, the brake disc resistance and the total transmission resistance of the test vehicle and the vehicle speed respectively according to the gearbox resistance, the left and right half shaft resistance, the brake disc resistance and the total transmission resistance corresponding to the vehicle speeds. The invention only needs to measure each torque of the transmission component once, and can obtain the transmission resistance of each transmission component, one transmission component can be removed without adopting step-by-step subtraction method to test the resistance of one transmission component, and the resistance of only one transmission component can be tested at one time.
Drawings
FIG. 1 is a schematic diagram of a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart of a method of measuring the driving resistance of a vehicle according to a first embodiment of the present invention;
FIG. 3 is a detailed flowchart of step S30 of the method for measuring the driving resistance of a vehicle according to the present invention;
fig. 4 is a flowchart illustrating a method for measuring a driving resistance of a vehicle according to a third embodiment of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic diagram of a hardware structure of a test system provided in various embodiments of the present invention. The test system comprises a communication module 01, a memory 02, a processor 03 and the like. Those skilled in the art will appreciate that the test system shown in FIG. 1 may also include more or fewer components than shown, or combine certain components, or a different arrangement of components. The processor 03 is connected to the memory 02 and the communication module 01, respectively, and the memory 02 stores a computer program, which is executed by the processor 03 at the same time.
The communication module 01 may be connected to an external device through a network. The communication module 01 may receive data sent by an external device, and may also send data, instructions, and information to the external device, where the external device may be an electronic device such as a mobile phone, a tablet computer, a notebook computer, and a desktop computer.
The memory 02 may be used to store software programs and various data. The memory 02 may mainly include a program storage area and a data storage area, where the program storage area may store an operating system, an application program required by at least one function (controlling the test vehicle to run at a constant speed under a plurality of vehicle speeds, respectively), and the like; the storage data area may store data or information created according to the use of the test system, or the like. Further, the memory 02 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other volatile solid state storage device.
The processor 03, which is a control center of the test system, connects various parts of the entire test system using various interfaces and lines, and performs various functions of the test system and processes data by running or executing software programs and/or modules stored in the memory 02 and calling data stored in the memory 02, thereby performing overall monitoring of the test system. Processor 03 may include one or more processing units; preferably, the processor 03 may integrate an application processor, which mainly handles operating systems, user interfaces, application programs, etc., and a modem processor, which mainly handles wireless communications. It will be appreciated that the modem processor described above may not be integrated into the processor 03.
Although not shown in fig. 1, the test system may further include a circuit control module, where the circuit control module is used for being connected to a mains supply to implement power control and ensure normal operation of other components.
Those skilled in the art will appreciate that the test system configuration shown in FIG. 1 does not constitute a limitation of the test system, and may include more or fewer components than shown, or some components in combination, or a different arrangement of components.
Various embodiments of the method of the present invention are presented in terms of the above-described hardware architecture.
Referring to fig. 2, in a first embodiment of the vehicle driving resistance measurement method of the invention, the vehicle driving resistance measurement method includes the steps of:
step S10, controlling the test vehicle to run at a constant speed under a plurality of vehicle speeds respectively;
in the scheme, the torque sensor is used for accurately testing the torque of the rotating piece according to the deformation degree of the strain gauge of the torque sensor. Before testing, a torque sensor is respectively arranged on an engine flywheel, a gearbox output end shaft, a left half shaft, a right half shaft and a brake disc of a test vehicle, and for the engine flywheel and the brake disc, the torque sensor is generally arranged at the edge positions of the engine flywheel and the brake disc. The test system is in wired or wireless communication connection with the torque sensor, and the torque sensor can send the acquired torque value to the test system in real time through a wired network or a wireless network.
The test system can communicate with a central control system of the test vehicle through a wire, sequentially sends different vehicle speed control signals, controls the test vehicle to sequentially run for a certain time at a constant speed at different vehicle speeds, or sends different vehicle speed control signals to a terminal of a driver, so that the driver correspondingly controls the test vehicle to run for a certain time at a constant speed at different vehicle speeds according to the vehicle speed control signals received by the terminal of the driver, the constant-speed running time can be 1 minute or 2 minutes, limitation is not performed, and the torque sensor can acquire a stable torque value within the time.
It should be noted that the vehicle speed values selected in controlling the test vehicle to run at a constant speed under a plurality of vehicle speeds respectively can be selected at equal intervals, such as 20km/h, 40km/h, 60km/h, 80km/h, 100km/h and 120km/h in sequence, or can be selected at unequal intervals, such as 30km/h, 50km/h, 60km/h, 80km/h, 90km/h and 120 km/h. The number of the selected respective vehicle speed values may also be 3, 4 or more.
Step S20, obtaining engine output torque, gearbox output torque, left half shaft output torque, right half shaft output torque and brake disc output torque which are correspondingly collected by torque sensors on an engine flywheel, a gearbox output end shaft, a left half shaft, a right half shaft and a brake disc in the process of uniform speed running of the test vehicle at each vehicle speed;
in the process that a test vehicle runs at a constant speed at a certain vehicle speed at each time, torque sensors respectively arranged on an engine flywheel, a gearbox output end shaft, a left half shaft, a right half shaft and a brake disc correspondingly acquire engine output torque, gearbox output torque, left half shaft output torque, right half shaft output torque and brake disc output torque at the vehicle speed, and then each torque sensor can transmit the acquired torque value to a test system. For example, when a test vehicle is controlled to run at a constant speed of 30km/h, a torque sensor on an engine flywheel can acquire the output torque of the engine when the vehicle speed is 30km/h, a torque sensor on an output end shaft of a gearbox can acquire the output torque of the gearbox when the vehicle speed is 30km/h, a torque sensor on a left half shaft can acquire the output torque of the left half shaft when the vehicle speed is 30km/h, a torque sensor on a right half shaft can acquire the output torque of the right half shaft when the vehicle speed is 30km/h, and a torque sensor on a brake disc can acquire the output torque of the brake disc when the vehicle speed is 30 km/h.
Step S30, obtaining gearbox resistance, left and right half shaft resistance, brake disc resistance and transmission total resistance corresponding to each vehicle speed according to the flywheel radius, the shaft radius of the gearbox output end, the radius of the left half shaft, the radius of the right half shaft, the radius of the brake disc of the test vehicle and the engine output torque, the gearbox output torque, the left half shaft output torque, the right half shaft output torque and the brake disc output torque corresponding to each vehicle speed;
after the testing system obtains the engine output torque, the gearbox output torque, the left half shaft output torque, the right half shaft output torque and the brake disc output torque corresponding to each vehicle speed, according to parameters of a flywheel radius, a gearbox output end shaft radius, a left half shaft radius, a right half shaft radius and a brake disc radius of a testing vehicle which are preset before testing, the parameters are analyzed and calculated to obtain gearbox resistance, left half shaft resistance, right half shaft resistance, brake disc resistance and total transmission resistance corresponding to each vehicle speed.
Referring to fig. 3, fig. 3 is a detailed schematic view of a flow of step S30 in an embodiment of the present application, based on the above embodiment, step S30 includes:
step S31, obtaining gearbox resistance corresponding to each vehicle speed according to the engine output torque corresponding to each vehicle speed, the gearbox output torque corresponding to each vehicle speed, the flywheel radius of the test vehicle and the gearbox output end shaft radius of the test vehicle;
after obtaining the engine output torque, the gearbox output torque, the left half shaft output torque, the right half shaft output torque and the brake disc output torque corresponding to each vehicle speed, the test system calls a calculation formula of gearbox resistance stored in advance:
Fbecome＝THair-like device×RFly away-TBecome×RBecomeWherein F isHalf ofGearbox drag, T, for the same speedHair-like deviceEngine output torque, T, for the same vehicle speedBecomeAnd outputting the torque for the gearbox corresponding to the same speed, wherein R fly is the radius of a flywheel disc of the test vehicle, and R becomes the radius of a gearbox output end shaft of the test vehicle.
And then inputting the radius of a flywheel of a test vehicle, the radius of a shaft at the output end of the gearbox, the obtained engine output torque and the obtained gearbox output torque corresponding to each vehicle speed, which are preset before the test, into a gearbox resistance calculation formula, and respectively calculating to obtain the gearbox resistance corresponding to each vehicle speed.
Step S32, obtaining left and right half axle resistance corresponding to each vehicle speed according to the gearbox output torque corresponding to each vehicle speed, the left half axle output torque corresponding to each vehicle speed, the right half axle output torque corresponding to each vehicle speed, the radius of the gearbox output end shaft of the test vehicle, the radius of the left half axle of the test vehicle and the radius of the right half axle of the test vehicle;
similarly, after the test system obtains the engine output torque, the transmission output torque, the left half-shaft output torque, the right half-shaft output torque and the brake disc output torque corresponding to each vehicle speed, when the test system needs to calculate the left half-shaft resistance and the right half-shaft resistance corresponding to each vehicle speed, a pre-stored left half-shaft resistance calculation formula and a pre-stored right half-shaft resistance calculation formula are called firstly:
Fhalf of＝TBecome×RBecome-TLeft side of×RLeft side of-TLeft side of×RLeft side ofWherein F isHalf ofLeft and right half axle resistance corresponding to the same vehicle speed，TBecomeFor the same speed of the vehicleLeft side ofLeft half-axle output torque, T, for the same vehicle speedRight sideThe torque is output by the right half shaft corresponding to the same speed, R is the radius of the shaft at the output end of the gearbox of the test vehicle, RLeft side ofTo test the left axle shaft radius of a vehicle, RRight sideTo test the right half-axis radius of the vehicle.
And then the testing system inputs the preset gearbox output end shaft radius, left half shaft radius and right half shaft radius of the tested vehicle before testing, and the obtained gearbox output torque, right half shaft output torque and left half shaft output torque corresponding to each vehicle speed into a gearbox resistance calculation formula, and respectively calculates and obtains the left half shaft resistance and the right half shaft resistance corresponding to each vehicle speed.
Step S33, according to the left half-axle output torque corresponding to each vehicle speed, the right half-axle output torque corresponding to each vehicle speed, the brake disc output torque corresponding to each vehicle speed, the left half-axle radius of the test vehicle, the right half-axle radius of the test vehicle and the brake disc radius of the test vehicle, the brake disc resistance corresponding to each vehicle speed is obtained;
similarly, after the test system obtains the engine output torque, the transmission output torque, the left half-shaft output torque, the right half-shaft output torque and the brake disc output torque corresponding to each vehicle speed, when the test system needs to calculate the brake disc resistance corresponding to each vehicle speed, a brake disc resistance calculation formula stored in advance is called first:
Fsystem for making＝TLeft side of×RLeft side of+TLeft side of×RLeft side of-TSystem for making×RSystem for makingWherein F isSystem for makingBrake disc resistance, T, for the same vehicle speedSystem for makingBrake disc output torque, T, for the same vehicle speedLeft side ofLeft half-axle output torque, T, for the same vehicle speedRight sideThe right half shaft outputs torque R corresponding to the same vehicle speedSystem for makingFor testing the brake disc radius of a vehicle, RLeft side ofTo test the left axle shaft radius of a vehicle, RRight sideTo test the right half-axis radius of the vehicle.
And then the testing system inputs the radius of the left half shaft, the radius of the right half shaft and the radius of the brake disc of the testing vehicle which are preset before testing, and the obtained output torque of the right half shaft, the left half shaft and the brake disc corresponding to each vehicle speed into a gearbox resistance calculation formula, and the brake disc resistance corresponding to each vehicle speed is obtained through calculation respectively.
And step S34, obtaining the total transmission resistance corresponding to each vehicle speed according to the engine output torque corresponding to each vehicle speed, the brake disc output torque corresponding to each vehicle speed, the flywheel radius of the test vehicle and the brake disc radius of the test vehicle.
Similarly, after the test system obtains the engine output torque, the transmission output torque, the left half shaft output torque, the right half shaft output torque and the brake disc output torque corresponding to each vehicle speed, when the test system needs to calculate the total transmission resistance corresponding to each vehicle speed, a prestored total transmission resistance calculation formula is called first:
Fgeneral assembly＝THair-like device×RFly away-TSystem for making×RSystem for makingWherein F isGeneral assemblyTotal transmission resistance, T, for the same vehicle speedHair-like deviceEngine output torque, T, for the same vehicle speedBecomeThe torque is output for the brake disc corresponding to the same speed, R fly is the radius of the flywheel disc of the test vehicle, R flyBecomeTo test the brake disc radius of the vehicle.
And then the testing system inputs the radius of a flywheel and the radius of a brake disc of the testing vehicle which are preset before testing, and the obtained output torque of the engine and the output torque of the brake disc corresponding to each vehicle speed into a total transmission resistance calculation formula, and the total transmission resistance corresponding to each vehicle speed is obtained through calculation respectively.
The execution sequence of step S31, step S32, step S33, and step S34 is not limited, and may be executed simultaneously or sequentially.
And step S40, obtaining a relation curve between the gearbox resistance, the left and right half-axle resistance, the brake disc resistance and the total transmission resistance of the test vehicle and the vehicle speed respectively according to the gearbox resistance, the left and right half-axle resistance, the brake disc resistance and the total transmission resistance corresponding to each vehicle speed.
After the testing system obtains the gearbox resistance, the left and right half-axle resistance, the brake disc resistance and the total transmission resistance corresponding to each vehicle speed, a relation curve of the gearbox resistance and the vehicle speed piece is fitted according to the gearbox resistance corresponding to each vehicle speed, a relation curve of the left and right half-axle resistance and the vehicle speed piece is fitted according to the left and right half-axle resistance corresponding to each vehicle speed, a relation curve of the brake disc resistance and the vehicle speed piece is fitted according to the brake disc resistance corresponding to each vehicle speed, and a relation curve between the total transmission resistance and the vehicle speed is fitted according to the total transmission resistance corresponding to each vehicle speed.
The accuracy of the fitted relationship curve between the resistance and the vehicle speed is related to each vehicle speed selected in step S20 and the number of vehicle speeds selected. The more the number of the selected vehicle speed values is, and the more uniform the vehicle speed distribution is, the higher the accuracy of the fitted relation curve between each resistance and the vehicle speed is, and the more the actual condition can be reflected.
In the embodiment, torque sensors are respectively arranged on an engine flywheel, a gearbox output end shaft, a left half shaft, a right half shaft and a brake disc of a test vehicle, and then the test vehicle is controlled to run at a constant speed under a plurality of vehicle speeds; the method comprises the steps that engine output torque, gearbox output torque, left half shaft output torque, right half shaft output torque and brake disc output torque which are correspondingly collected by torque sensors on an engine flywheel, a gearbox output end shaft, a left half shaft, a right half shaft and a brake disc in the process that a test vehicle runs at a constant speed at each speed are obtained; according to the flywheel radius, the shaft radius of the output end of the gearbox, the radius of a left half shaft, the radius of a right half shaft and the radius of a brake disc of a test vehicle, and the engine output torque, the gearbox output torque, the left half shaft output torque, the right half shaft output torque and the brake disc output torque corresponding to each vehicle speed, obtaining the gearbox resistance, the left half shaft resistance, the right half shaft resistance, the brake disc resistance and the total transmission resistance corresponding to each vehicle speed; and obtaining a relation curve between the gearbox resistance, the left and right half shaft resistance, the brake disc resistance and the total transmission resistance of the test vehicle and the vehicle speed respectively according to the gearbox resistance, the left and right half shaft resistance, the brake disc resistance and the total transmission resistance corresponding to the vehicle speeds. The invention only needs to measure each torque of the transmission component once, and can obtain the transmission resistance of each transmission component, one transmission component can be removed without adopting step-by-step subtraction method to test the resistance of one transmission component, and the resistance of only one transmission component can be tested at one time.
Further, a second embodiment of the vehicle driving resistance measurement method according to the present application is proposed according to the first embodiment of the vehicle driving resistance measurement method according to the present application, and in the present embodiment, step S40 is preceded by:
step S50, judging whether the gearbox resistance, the left half shaft resistance, the right half shaft resistance and the brake disc resistance corresponding to each vehicle speed are all larger than 0; if yes, go to step S40.
In this embodiment, the transmission resistance of each component is equal to the difference between the output power of the previous transmission component and the output power of the component, and the output power of the previous transmission component is certainly greater than the output power of the next transmission component along the power output direction, so that the calculated transmission resistance of each component is certainly greater than 0, and therefore, before the test system constructs a relationship curve between the transmission resistance, the left and right half-axis resistances, the brake disc resistance, the total transmission resistance and the vehicle speed, it will be determined whether the obtained transmission resistance, the left and right half-axis resistances and the brake disc resistance corresponding to each vehicle speed are all greater than 0, and if the transmission resistance, the left and right half-axis resistances and the brake disc resistance corresponding to each vehicle speed are all greater than 0, the test system will fit the relationship curve between the transmission resistance and the vehicle speed, the relationship curve between the left and right half-axis resistances and the vehicle, The relationship curve between the brake disc resistance and the vehicle speed and the relationship curve between the total transmission resistance and the vehicle speed.
It should be noted that if the transmission resistance, the left and right axle resistance, and the brake disc resistance corresponding to each vehicle speed are not uniform to be greater than 0, it indicates that at least one of the transmission resistance, the left and right axle resistance, and the brake disc resistance corresponding to each vehicle speed is not greater than 0, and then the test system will perform the test again.
In the embodiment, the correct relationship curve between the resistance and the vehicle speed is ensured to be fitted by verifying the resistance values corresponding to the obtained vehicle speeds.
Further, referring to fig. 4, fig. 4 is a third embodiment of the method for measuring the driving resistance of the vehicle according to the first embodiment and the second embodiment of the method for measuring the driving resistance of the vehicle according to the present application, and in this embodiment, step S10 is preceded by:
and step S60, calibrating the torque sensors, and respectively installing the calibrated torque sensors on an engine flywheel, a gearbox output end shaft, a left half shaft, a right half shaft and a brake disc of the test vehicle.
Before installing each torque sensor at flywheel, gearbox output shaft, left semi-axis, right semi-axis and the brake disc of test vehicle, can calibrate each torque sensor, only after the calibration is qualified, just can install the qualified torque sensor of calibration respectively on engine flywheel, gearbox output shaft, left semi-axis, right semi-axis and the brake disc of test vehicle. The specific process of calibrating the torque sensor is as follows: the torque sensor is arranged on a driving shaft in a test system, the test system loads a preset torque to the driving shaft, the sensor outputs a torque value, and the output torque value is calibrated according to the preset torque value loaded by the test system.
In the embodiment, each torque sensor is calibrated before testing, so that the accuracy of the torque value acquired by the torque sensor in the subsequent testing process is improved, and the accuracy of the final result is improved.
The invention also proposes a computer-readable storage medium on which a computer program is stored. The computer-readable storage medium may be the Memory 02 in the test system of fig. 1, and may also be at least one of a ROM (Read-Only Memory)/RAM (Random Access Memory), a magnetic disk, and an optical disk, and the computer-readable storage medium includes several pieces of information for enabling the test system to perform the method according to the embodiments of the present invention.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A vehicle transmission resistance measuring method is characterized in that torque sensors are respectively mounted on an engine flywheel, a gearbox output end shaft, a left half shaft, a right half shaft and a brake disc of a test vehicle, and the vehicle transmission resistance measuring method comprises the following steps:
controlling the test vehicle to run at a constant speed under a plurality of vehicle speeds respectively;
the method comprises the steps that engine output torque, gearbox output torque, left half shaft output torque, right half shaft output torque and brake disc output torque which are correspondingly collected by torque sensors on an engine flywheel, a gearbox output end shaft, a left half shaft, a right half shaft and a brake disc in the process that a test vehicle runs at a constant speed at each speed are obtained;
according to the flywheel radius, the shaft radius of the output end of the gearbox, the radius of a left half shaft, the radius of a right half shaft and the radius of a brake disc of a test vehicle, and the engine output torque, the gearbox output torque, the left half shaft output torque, the right half shaft output torque and the brake disc output torque corresponding to each vehicle speed, obtaining the gearbox resistance, the left half shaft resistance, the right half shaft resistance, the brake disc resistance and the total transmission resistance corresponding to each vehicle speed;
and obtaining a relation curve between the gearbox resistance, the left and right half shaft resistance, the brake disc resistance and the total transmission resistance of the test vehicle and the vehicle speed respectively according to the gearbox resistance, the left and right half shaft resistance, the brake disc resistance and the total transmission resistance corresponding to the vehicle speeds.
2. The method for measuring the transmission resistance of the vehicle according to claim 1, wherein the step of obtaining the transmission resistance, the left and right axle resistances, the brake disc resistance and the total transmission resistance corresponding to each vehicle speed according to the flywheel radius, the transmission output end axle radius, the left axle radius, the right axle radius, the brake disc radius of the test vehicle, and the engine output torque, the transmission output torque, the left axle output torque, the right axle output torque and the brake disc output torque corresponding to each vehicle speed comprises:
obtaining gearbox resistance corresponding to each speed according to the engine output torque corresponding to each speed, the gearbox output torque corresponding to each speed, the flywheel radius of the test vehicle and the gearbox output end shaft radius of the test vehicle;
obtaining left and right half shaft resistance corresponding to each vehicle speed according to the transmission output torque corresponding to each vehicle speed, the left half shaft output torque corresponding to each vehicle speed, the right half shaft output torque corresponding to each vehicle speed, the shaft radius of the transmission output end of the test vehicle, the left half shaft radius of the test vehicle and the right half shaft radius of the test vehicle;
obtaining brake disc resistance corresponding to each vehicle speed according to the left half-shaft output torque corresponding to each vehicle speed, the right half-shaft output torque corresponding to each vehicle speed, the brake disc output torque corresponding to each vehicle speed, the left half-shaft radius of the test vehicle, the right half-shaft radius of the test vehicle and the brake disc radius of the test vehicle;
and obtaining the total transmission resistance corresponding to each vehicle speed according to the engine output torque corresponding to each vehicle speed, the brake disc output torque corresponding to each vehicle speed, the flywheel radius of the test vehicle and the brake disc radius of the test vehicle.
3. The method according to claim 2, wherein the step of obtaining the transmission resistance corresponding to each vehicle speed according to the engine output torque corresponding to each vehicle speed, the transmission output torque corresponding to each vehicle speed, the flywheel radius of the test vehicle, and the transmission output shaft radius of the test vehicle comprises:
calculating the gearbox resistance corresponding to each speed according to a preset gearbox resistance calculation formula, the engine output torque corresponding to each speed, the gearbox output torque corresponding to each speed, the flywheel radius of the test vehicle and the gearbox output end shaft radius of the test vehicle, wherein the preset gearbox resistance calculation formula is as follows:
Fbecome＝THair-like device×RFly away-TBecome×RBecome，
Wherein, FHalf ofGearbox drag, T, for the same speedHair-like deviceEngine output torque, T, for the same vehicle speedBecomeThe output torque, R, of the gearbox corresponding to the same vehicle speedFly awayFor testing flywheel disc radius, R, of vehiclesBecomeTo test the transmission output shaft radius of a vehicle.
4. The vehicle transmission resistance measurement method according to claim 2, wherein the step of obtaining the left and right axle resistances corresponding to the respective vehicle speeds from the transmission output torque corresponding to the respective vehicle speeds, the left axle output torque corresponding to the respective vehicle speeds, the right axle output torque corresponding to the respective vehicle speeds, the transmission output end axle radius of the test vehicle, the left axle radius of the test vehicle, and the right axle radius of the test vehicle includes:
calculating left and right half axle resistances corresponding to the speeds according to a preset left and right half axle resistance calculation formula, the gearbox output torque corresponding to each speed, the left half axle output torque corresponding to each speed, the right half axle output torque corresponding to each speed, the gearbox output end shaft radius of the test vehicle, the left half axle radius of the test vehicle and the right half axle radius of the test vehicle, wherein the preset left and right half axle resistance calculation formula is as follows:
Fhalf of＝TBecome×RBecome-TLeft side of×RLeft side of-TLeft side of×RLeft side of，
Wherein, FHalf ofLeft and right half-axle resistances, T, corresponding to the same vehicle speedBecomeFor the same speed of the vehicleLeft side ofLeft half-axle output torque, T, for the same vehicle speedRight sideThe right half shaft outputs torque R corresponding to the same vehicle speedBecomeFor testing the output shaft radius, R, of a vehicle gearboxLeft side ofTo test the left axle shaft radius of a vehicle, RRight sideTo test the right half-axis radius of the vehicle.
5. The method according to claim 2, wherein the step of obtaining the brake disc resistance corresponding to each vehicle speed according to the left half-shaft output torque corresponding to each vehicle speed, the right half-shaft output torque corresponding to each vehicle speed, the brake disc output torque corresponding to each vehicle speed, the left half-shaft radius of the test vehicle, the right half-shaft radius of the test vehicle, and the brake disc radius of the test vehicle comprises:
calculating the brake disc resistance corresponding to each vehicle speed according to a preset brake disc resistance calculation formula, the left half-shaft output torque corresponding to each vehicle speed, the right half-shaft output torque corresponding to each vehicle speed, the brake disc output torque corresponding to each vehicle speed, the left half-shaft radius of the test vehicle, the right half-shaft radius of the test vehicle and the brake disc radius of the test vehicle, wherein the preset brake disc resistance calculation formula is as follows:
Fsystem for making＝TLeft side of×RLeft side of+TLeft side of×RLeft side of-TSystem for making×RSystem for making，
Wherein, FSystem for makingBrake disc resistance, T, for the same vehicle speedSystem for makingBrake disc output torque, T, for the same vehicle speedLeft side ofLeft half-axle output torque, T, for the same vehicle speedRight sideThe right half shaft outputs torque R corresponding to the same vehicle speedSystem for makingFor testing the brake disc radius of a vehicle, RLeft side ofTo test the left axle shaft radius of a vehicle, RRight sideTo test the right half-axis radius of the vehicle.
6. The method according to claim 2, wherein the step of obtaining the total transmission resistance corresponding to each vehicle speed according to the engine output torque corresponding to each vehicle speed, the brake disc output torque corresponding to each vehicle speed, the flywheel radius of the test vehicle, and the brake disc radius of the test vehicle comprises:
calculating the total transmission resistance corresponding to each vehicle speed according to a preset total transmission resistance calculation formula, the engine output torque corresponding to each vehicle speed, the brake disc output torque corresponding to each vehicle speed, the flywheel radius of the test vehicle and the brake disc radius of the test vehicle, wherein the preset total transmission resistance calculation formula is as follows:
Fgeneral assembly＝THair-like device×RFly away-TSystem for making×RSystem for making，
Wherein, FGeneral assemblyTotal transmission resistance, T, for the same vehicle speedHair-like deviceEngine output torque, T, for the same vehicle speedBecomeBrake disc output torque, R, for the same vehicle speedFly awayFor testing flywheel disc radius, R, of vehiclesBecomeTo test the brake disc radius of the vehicle.
7. The vehicle transmission resistance measurement method according to any one of claims 1 to 6, wherein before the step of obtaining the relationship curves between the transmission resistance, the left and right axle resistance, the brake disc resistance, and the total transmission resistance of the test vehicle and the vehicle speed, respectively, according to the transmission resistance, the left and right axle resistance, the brake disc resistance, and the total transmission resistance corresponding to each vehicle speed, the method further comprises:
judging whether the gearbox resistance, the left half shaft resistance, the right half shaft resistance and the brake disc resistance corresponding to each vehicle speed are all larger than 0;
and if so, executing the step of obtaining the relationship curves between the gearbox resistance, the left and right half-axle resistance, the brake disc resistance and the total transmission resistance of the test vehicle and the vehicle speed respectively according to the gearbox resistance, the left and right half-axle resistance, the brake disc resistance and the total transmission resistance corresponding to each vehicle speed.
8. The vehicle transmission resistance measurement method according to claim 7, wherein before the step of controlling the test vehicle to run at a constant speed at a plurality of vehicle speeds, respectively, further comprising:
and calibrating the torque sensor, and respectively installing the calibrated torque sensor on an engine flywheel, a gearbox output end shaft, a left half shaft, a right half shaft and a brake disc of the test vehicle.
9. A test system comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the computer program when executed by the processor implementing the steps of the vehicle transmission resistance measurement method of any one of claims 1 to 8.
10. A computer-readable storage medium, characterized in that a computer program is stored thereon, which computer program, when being executed by a processor, carries out the steps of the vehicle transmission resistance measurement method according to any one of claims 1 to 8.
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