阅读说明：本技术 全挂式牵引性能测试系统及其试验方法 (Full-hanging type traction performance testing system and testing method thereof ) 是由 贾方 王宁毅 潘华磊 李华雷 刘琨 张琳琳 郭蕊蕊 胡豪 万继武 王伟伟 于 2021-04-01 设计创作，主要内容包括：全挂式牵引性能测试系统及其试验方法,包括：被试车辆,牵引架,挂车转盘,底盘,电阻器,发电机组,强电柜,采集箱,电机控制器,油箱,驻车制动系统,油耗仪,冷却系统,拉力传感器,销轴,编码器,加载桥,连接梁；被试车辆通过销轴与牵引架连接,牵引架通过挂车转盘与底盘连接,电阻器、发电机组、强电柜、采集箱、电机控制器、油箱、驻车制动系统、油耗仪、冷却系统依次通过螺钉固定在底盘上部。本发明提供了一种全挂式牵引性能测试系统及其试验方法,采用盘式永磁同步电机,四象限变频轮边电机直接驱动,无需变速箱、分动箱、传动轴等传统机械结构,极大的提高了使用效率,优选出的试验方法有效地保证了测试系统的测试精度。(The full-hanging type traction performance test system and the test method thereof comprise the following steps: the device comprises a tested vehicle, a traction frame, a trailer turntable, a chassis, a resistor, a generator set, a strong power cabinet, a collection box, a motor controller, an oil tank, a parking braking system, an oil consumption meter, a cooling system, a tension sensor, a pin shaft, an encoder, a loading bridge and a connecting beam; the tested vehicle is connected with the traction frame through a pin shaft, the traction frame is connected with the chassis through a trailer turntable, and the resistor, the generator set, the strong cabinet, the collection box, the motor controller, the oil tank, the parking braking system, the oil consumption meter and the cooling system are sequentially fixed on the upper portion of the chassis through screws. The invention provides a full-hanging type traction performance testing system and a testing method thereof, wherein a disc type permanent magnet synchronous motor and a four-quadrant variable frequency wheel-side motor are directly driven without traditional mechanical structures such as a gearbox, a transfer case, a transmission shaft and the like, the use efficiency is greatly improved, and the testing precision of the testing system is effectively ensured by the optimized testing method.)

1. Full-hanging traction performance test system includes: the device comprises a tested vehicle (1), a traction frame (2), a trailer turntable (3), a chassis (4), a resistor (5), a generator set (6), a strong cabinet (7), a collection box (8), a motor controller (9), an oil tank (10), a parking braking system (11), an oil consumption meter (12), a cooling system (13), a tension sensor (14), a pin shaft (15), an encoder (16), a loading bridge (17) and a connecting beam (18); the method is characterized in that: the device comprises a tested vehicle (1), a traction frame (2), a trailer turntable (3), a resistor (5), a generator set (6), a strong cabinet (7), a collection box (8), a motor controller (9), an oil tank (10), a parking braking system (11), an oil consumption meter (12) and a cooling system (13), wherein the tested vehicle is connected with the traction frame (2) through a pin shaft (15), the traction frame (2) is connected with a chassis (4) through the trailer turntable (3), and the oil consumption meter and the cooling system (13) are sequentially fixed on the upper portion of the chassis (.

2. The fully-suspended traction performance testing system according to claim 1, wherein: an encoder (16) is mounted at the center of the wheel of the vehicle (1) to be tested.

3. The fully-suspended traction performance testing system according to claim 1, wherein: and a tension sensor (14) is arranged in the traction frame (2) through a pin shaft (15).

4. The fully-suspended traction performance testing system according to claim 1, wherein: the lower part of the chassis (4) is provided with a connecting beam (18) and two loading bridges (17); the two loading bridges (17) are connected by a connecting beam (18).

5. The fully-suspended traction performance testing system according to claim 1, wherein: the loading bridge (17) comprises two disc type permanent magnet synchronous motors which are mutually independent and are controlled independently.

6. The fully-suspended traction performance testing system according to claim 1, wherein the testing method comprises the following steps:

【1】 Before the test is started, a key of the generator set (6) is rotated to start a switch, and the generator set (6) is started;

【2】 After the generator set (6) is started, a power switch button, an oil pump starting button, a parking release button and a frequency converter starting button on the generator set (6) are sequentially pressed, and then a cooling system starting and stopping knob and a cooling system starting and stopping button are rotated to be in an opening state;

【3】 Placing the tested vehicle (1) in front of the traction frame (2), adjusting the height of the traction frame (2) from the ground through a traction frame ascending button and a traction frame descending button on the traction frame (2) until the height of the traction frame (2) is consistent with the height of a traction point of the tested vehicle (1), and then inserting a pin shaft (15);

【4】 Mounting an encoder (16) to the wheel center of a vehicle (1) to be tested via a magnet;

【5】 A pipeline connected with the oil consumption meter (12);

【6】 An operator rotates the control knob of the operation mode of the load vehicle to an automatic mode;

【7】 A driver drives a tested vehicle (1) to run on a special test runway at a low gear and a stable speed;

【8】 An operator controls an operation interface remotely, and the loading capacity of the load vehicle is slowly increased manually or automatically until measurement parameters such as the traction power, the traction force, the slip ratio and the oil consumption of the gear are measured;

【9】 After the gear measurement is finished, unloading until the gear is 0, then prompting a driver to change another gear of the tested vehicle (1), and then driving at a stable speed;

【10】 Repeating the steps [ 8 ] and [ 9 ] until the gear of the maximum traction power of the tested vehicle (1) is measured;

【11】 If the traction force of the tested vehicle (1) or the traction force of a certain gear cannot overcome the friction force between the load vehicle and the ground, an operator remotely controls an operation interface at the moment, a loading motor is adjusted to a driving mode, and the loading motor provides a driving force for the load vehicle at the moment so as to overcome part of the friction force;

【12】 The method comprises the following steps that an operator slowly adjusts the driving force of a loading motor until a tested vehicle (1) reaches a tested state until measurement parameters such as the traction power, the traction force, the slip ratio and the oil consumption of the tested vehicle (1) or a gear are measured;

【13】 Repeating the steps [ 11 ] and [ 12 ] until the gear of the maximum traction power of the tested vehicle (1) is measured;

【14】 After the test is finished, a driver drives the tested vehicle (1) to pull the load vehicle to be close to the parking position, and then the pin shaft (15) is removed;

【15】 An operator rotates the control knob of the operation mode of the load wagon to a manual mode;

【16】 An operator operates the remote controller of the load vehicle to control each loading motor of the load vehicle to rotate forwards or reversely, and sequentially control the load vehicle to advance, retreat and turn until the load vehicle finishes warehousing;

【17】 After warehousing is finished, firstly pressing a parking brake button to ensure that the load vehicle is in a braking state, then sequentially pressing a down converter stop button and an oil pump stop button, and then rotating a cooling system start-stop knob and a cooling system start-stop button to a stop state;

【18】 And finally, rotating the starting and stopping knob of the generator set (6) to a stop state, and closing the generator set (6).

Technical Field

The invention belongs to the field of production, test and detection of agricultural equipment complete machines, and relates to a full-hanging type traction performance test system and a test method thereof.

Background

At present, the common vehicle traction performance test basically measures the traction force by adopting a mode that a tested vehicle pulls a load vehicle, and the load vehicle is a special vehicle capable of applying traction load. The common load-carrying vehicle in the prior art is usually formed by modifying vehicles such as tractors, engineering machinery, general trucks or low-speed automobiles. The traction loading can be realized by adding an electric dynamometer, an eddy current dynamometer or a hydraulic loading system on the modified vehicle.

However, this design has several disadvantages during use: firstly, when a load vehicle formed by refitting the vehicle is used for a traction test, a professional load vehicle driver needs to be equipped, and a measurement result is easily influenced by the technical level of personnel; secondly, when a load vehicle formed by refitting the vehicle is used for a traction test, the load vehicle cannot generate driving force to overcome resistance generated by the self weight, so that the load vehicle is difficult to realize a zero-load traction test and has certain limit on the power of the tested vehicle; thirdly, when a load vehicle formed by refitting the vehicle is used for a traction test, the time for achieving steady-state measurement is longer, and the efficiency is not high; fourthly, a load vehicle formed by refitting the vehicle is generally provided with a special transfer case to match the loading rotating speed requirement of the dynamometer; the structure has large energy loss, high requirements on processing and manufacturing precision and high price. In addition, in order to ensure that the loading system does not overspeed in tests at different vehicle speeds, the gear of the gearbox needs to be changed without time, so that the operation is troublesome, and the test result is influenced.

The invention patent application 'a tractor traction load mobile test system and method' published by the national intellectual property office in 8-month-28-year 2020, the patent application numbers are: 202010484952.0, the filing date of the patent is: day 1 month 6 in 2020, bulletin number: CN 111595594A. The invention discloses a tractor traction load mobile test system and method. Wherein the system comprises: transfer case, hydraulic motor, hydraulic control mechanism and hydraulic power source, hydraulic motor intercommunication hydraulic control mechanism, hydraulic control mechanism intercommunication hydraulic power source, hydraulic control mechanism can control hydraulic motor's rotation, hydraulic motor's output intercommunication transfer case, and the transfer case is used for the walking of intercommunication load car, and the transfer case can also be used for the gearbox of intercommunication load car. The load vehicle used by the traction load mobile test system is formed by vehicle modification, and traction loading is realized through a hydraulic system. The hydraulic loading system is connected with the traveling system of the load vehicle through the transfer case, so that part of energy loss is inevitably caused, and the operation is complicated. In addition, the hydraulic system is adopted for loading, so that the defects of hydraulic oil leakage, poor pollution resistance, sensitivity to temperature change and the like can be avoided.

Another load vehicle structure commonly used in the market at present is: and transforming a universal truck chassis, and then installing an electric dynamometer, wherein the electric dynamometer is connected with a truck traveling system through a transfer case. The loading range of the load vehicle is limited by an electric dynamometer, such as a 200kN load vehicle currently used by a national tractor quality supervision and inspection center and an agricultural machinery test and identification central station of Ministry of agriculture is the structure. The maximum loading capacity of the load vehicle can reach 200kN, and the minimum loading capacity is 20kN, so that a tractor with low power cannot use the load vehicle to carry out a traction power test.

The particularity of the traction power test requires that the loaded vehicle gives the maximum traction load at low vehicle speeds and a smaller traction load at high vehicle speeds. The eddy current dynamometer adopted by other manufacturers at home and abroad has very small torque at low speed, the rated torque can be reached when the rotating speed reaches over 1960 rpm, the rated power can be reached when the rotating speed reaches over 5000 rpm, an additional speed raising box is added when the device is required to be used, the requirement can be met, and the consequences of high-speed working conditions are large vibration, large noise, high lubricating requirement on a dynamometer bearing and short service life of the bearing. Meanwhile, because the speed-up ratio is too large, in order to ensure that the loading system does not overspeed in tests at different vehicle speeds, the gear of the speed-up box needs to be changed when the loading system does not overspeed, so that the operation is troublesome, and the test result is influenced. .

Based on the situation, the application provides a full-hanging traction performance test system and a test method thereof, the disk type permanent magnet synchronous motor is adopted, the four-quadrant variable frequency wheel motor is directly driven, traditional mechanical structures such as a gearbox, a transfer case and a transmission shaft are not needed, the use efficiency is greatly improved, and the test precision is ensured.

Disclosure of Invention

The invention aims to provide a full-trailer traction performance test system and a test method thereof. The load car adopts a disc type permanent magnet synchronous motor, the four-quadrant variable frequency wheel motor is directly driven, and the traditional mechanical structures such as a gearbox, a transfer case and a transmission shaft are not needed, so that the service efficiency of the load car is greatly improved.

The invention achieves the above purpose by the following technical scheme: full-hanging traction performance test system includes: the device comprises a tested vehicle, a traction frame, a trailer turntable, a chassis, a resistor, a generator set, a strong power cabinet, a collection box, a motor controller, an oil tank, a parking braking system, an oil consumption meter, a cooling system, a tension sensor, a pin shaft, an encoder, a loading bridge and a connecting beam; the tested vehicle is connected with the traction frame through a pin shaft, the traction frame is connected with the chassis through a trailer turntable, and the resistor, the generator set, the strong cabinet, the collection box, the motor controller, the oil tank, the parking braking system, the oil consumption meter and the cooling system are sequentially fixed on the upper portion of the chassis through screws.

And an encoder is installed at the center of the wheel of the tested vehicle.

And a tension sensor is arranged in the traction frame through a pin shaft.

The lower part of the chassis is provided with a connecting beam and two loading bridges; the two loading bridges are connected by a connecting beam.

The loading bridge comprises two disc type permanent magnet synchronous motors which are mutually independent and are controlled independently.

The test method of the full-hanging type traction performance test system comprises the following steps:

【1】 Before the test is started, a key of the generator set is rotated to start a switch, and the generator set is started;

【2】 After the generator set is started, a power switch button, an oil pump starting button, a parking release button and a frequency converter starting button on the generator set are pressed in sequence, and then a cooling system starting and stopping button and a heat dissipation system starting and stopping button are rotated to be in an opening state;

【3】 Placing the tested vehicle in front of a traction frame, adjusting the height of the traction frame from the ground through a traction frame ascending button and a traction frame descending button on the traction frame until the height of the traction frame is consistent with the height of a traction point of the tested vehicle 1, and then inserting a pin shaft;

【4】 Mounting an encoder to the wheel center of the vehicle to be tested through a magnet;

【5】 Connecting a pipeline of the oil consumption meter;

【6】 An operator rotates the control knob of the operation mode of the load vehicle to an automatic mode;

【7】 A driver drives a tested vehicle and runs on the special test runway at a low gear and a stable speed;

【8】 An operator controls an operation interface remotely, and the loading capacity of the load vehicle is slowly increased manually or automatically until measurement parameters such as the traction power, the traction force, the slip ratio and the oil consumption of the gear are measured;

【9】 After the gear measurement is finished, unloading until the gear is 0, then prompting a driver to change another gear of the tested vehicle, and then driving at a stable speed;

【10】 Repeating the steps (8) and (9) until the gear with the maximum traction power of the vehicle to be tested is measured;

【11】 If the traction force of the tested vehicle or the traction force of a certain gear cannot overcome the friction force between the load vehicle and the ground, an operator remotely controls an operation interface at the moment, the loading motor is adjusted to a driving mode, and the loading motor provides a driving force for the load vehicle at the moment so as to overcome part of the friction force;

【12】 The operator slowly adjusts the driving force of the loading motor until the tested vehicle reaches the tested state until the tested vehicle or the gear is measured to obtain the measurement parameters of the traction power, the traction force, the slip ratio, the oil consumption and the like;

【13】 Repeating the steps (11) and (12) until the gear with the maximum traction power of the vehicle to be tested is measured;

【14】 After the test is finished, a driver drives the tested vehicle to pull the load vehicle to be close to the parking position, and then the pin shaft is removed;

【15】 An operator rotates the control knob of the operation mode of the load wagon to a manual mode;

【16】 An operator operates the remote controller of the load vehicle to control each loading motor of the load vehicle to rotate forwards or reversely, and sequentially control the load vehicle to advance, retreat and turn until the load vehicle finishes warehousing;

【17】 After warehousing is finished, firstly pressing a parking brake button to ensure that the load vehicle is in a braking state, then sequentially pressing a down converter stop button and an oil pump stop button, and then rotating a cooling system start-stop knob and a cooling system start-stop button to a stop state;

【18】 And finally, rotating the starting and stopping knob of the generator set to a stopping state, and closing the generator set.

By adopting the technical scheme, the invention can achieve the following beneficial effects:

(1) the loading bridge type disc permanent magnet synchronous motor is adopted for loading, the loading capacity is strong, the margin range is large, redundant systems connected in series or in parallel are not needed to increase power, the simplicity and reliability of the systems are ensured, and various tests can be conveniently carried out for a long time;

(2) the load vehicle can realize zero traction test and meet the requirement of full-power continuous loading;

(3) the load vehicle not only can complete a traction power test, but also has the functions of remote control of advancing, retreating and steering, so that the use scene of the load vehicle is greatly expanded, and the use convenience is greatly improved;

(4) the load vehicle does not need to be operated on the vehicle by a driver, so that the influence of human influence factors on the test result in the test process is thoroughly avoided;

(5) the load vehicle adopts a wireless communication technology, and the vehicle body of the load vehicle does not need to be provided with an operation room, so that the size of the whole load vehicle is effectively reduced, and the usability of the load vehicle is greatly improved.

Drawings

FIG. 1 is a schematic structural view of a fully-suspended traction performance testing system load vehicle according to the present invention;

FIG. 2 is a schematic top view of a fully-suspended traction performance testing system load-carrying vehicle according to the present invention;

fig. 3 is a schematic rear view of the fully-suspended traction performance test system load vehicle of the present invention.

In the figure: 1. the system comprises a tested vehicle, 2, a traction frame, 3, a trailer turntable, 4, a chassis, 5, a resistor, 6, a generator set, 7, a strong cabinet, 8, a collection box, 9, a motor controller, 10, an oil tank, 11, a parking braking system, 12, an oil consumption instrument, 13, a cooling system, 14, a tension sensor, 15, a pin shaft, 16, an encoder, 17, a loading bridge and 18, and a connecting beam.

Detailed Description

The invention is further described with reference to the following figures and examples. As shown in fig. 1 to 3, the fully-suspended traction performance testing system includes: the device comprises a tested vehicle 1, a traction frame 2, a trailer turntable 3, a chassis 4, a resistor 5, a generator set 6, a strong cabinet 7, a collection box 8, a motor controller 9, an oil tank 10, a parking braking system 11, an oil consumption meter 12, a cooling system 13, a tension sensor 14, a pin shaft 15, an encoder 16, a loading bridge 17 and a connecting beam 18.

The tested vehicle 1 is connected with the traction frame 2 through a pin shaft 15, and the traction frame 2 realizes stepless up-and-down movement through mechanisms such as a motor and a screw rod so as to adapt to the heights of the traction frames 2 of different tested vehicles. The traction frame 2 is connected with the chassis 4 through the trailer turntable 3, and the trailer turntable 3 adopts a standard traction rod trailer turntable, so that the strength is high and the replacement is easy.

The resistor 5, the generator set 6, the strong cabinet 7, the collection box 8, the motor controller 9, the oil tank 10, the parking braking system 11, the oil consumption meter 12 and the cooling system 13 are sequentially fixed on the chassis 4 through screws. In the test process, when a loading motor of the generator set 6 is in a loading state, the loading motor is in a power generation state, and generated power can be converted into heat energy through the resistor 5 to be consumed; the generator set 6 not only provides power for a control system of the full-load vehicle, but also provides power for the remote control running of the load vehicle; the data acquisition module, the wireless communication module and the like are arranged in the acquisition box 8 and are used for acquiring and transmitting various test data in the test process; the parking brake system 11 is mainly used for parking brake of the load vehicle to prevent the load vehicle from moving when the load vehicle is parked, and the overall safety of the load vehicle is improved; the cooling system 13 is a water cooling system, and mainly cools the motor controller 9 and the loading bridge 17, so that damage to components due to overhigh temperature during testing is prevented.

The tension sensor 14 is installed in the traction frame 2 through a pin shaft 15, the encoder 16 is installed in the center of a wheel of the tested vehicle 1 through a magnet, and the loading bridge 17 is connected with the chassis 4 through a connecting beam 18. The encoder 16 is mainly used for the slip rate of the tested vehicle 1 during the test; the loading bridge 17 comprises two disk-type permanent magnet synchronous motors which are mutually independent and are controlled independently.

The loading vehicle adopts the disc type permanent magnet synchronous motor for loading, has the characteristics of strong loading capacity and large margin range, the loading power is dissipated on the external resistor 5, the loading margin is large, and the thermal drift of the loading torque is small.

The independent running and turning functions of the load vehicle are realized: because the load vehicle adopts the design idea of a full trailer type, the load vehicle has great difficulty in parking in place depending on the tested vehicle 1, and the load vehicle has the functions of independent and autonomous running and turning. When the function is realized, the generator set 6 provides power for the loading motor, and when the rotation directions and the rotation speeds of the two motors of the loading bridge 17 of the load vehicle are controlled to be consistent, the load vehicle realizes the forward or backward function; when the two motors of the loading bridge 17 of the remote control load vehicle rotate in opposite directions and at the same speed, the load vehicle realizes the turning function.

The zero traction and full power loading functions of the load vehicle are realized: when the traction force of the tested vehicle 1 or the traction force of a certain gear of the tested vehicle 1 is not enough to pull the loaded vehicle to run, the motor controller 9 controls the loading motor to become a driving motor, so as to provide a driving force for the loaded vehicle and drive the loaded vehicle to run. When the driving force provided by the loading motor completely overcomes the self running resistance of the unloading vehicle and the running speed is consistent with that of the tested vehicle 1, the zero traction loading test can be realized. The implementation of the full power loading function is consistent with the above.

The test method of the full-hanging traction performance test system comprises the following steps:

【1】 Before the test is started, a key of the generator set 6 is rotated to start a switch, and the generator set 6 is started; the starting switch of the generator set 6 is led out and placed in a position easy for operators to operate, the situation that the operators climb to the upper part of the body of the load vehicle to start the generator set 6 is avoided, and the operability of the load vehicle is greatly improved.

【2】 After the generator set 6 is started, a power switch button, an oil pump starting button, a parking release button and a frequency converter starting button on the generator set 6 are sequentially pressed, and then a cooling system starting and stopping knob and a cooling system starting and stopping button are rotated to be in an opening state;

【3】 Placing the tested vehicle 1 in front of the traction frame 2, pressing down a 'traction frame ascending' or 'traction frame descending' button on the traction frame 2, adjusting the height from the ground of the traction frame 2 until the height from the ground of the traction frame 2 is consistent with the height of a traction point of the tested vehicle 1, and then inserting a pin shaft 15; because the traction frames 2 of the tested vehicles are different in height, the traction frames 2 designed by the invention are adjustable in height to adapt to different tested vehicles 1.

【4】 Mounting the encoder 16 to the wheel center of the vehicle 1 under test via a magnet; the encoder 16 is mainly used for measuring the slip rate of the wheels during the traction test of the vehicle 1 to be tested.

【5】 Connecting a pipeline of the oil consumption meter 12; after the oil circuit connection is completed, air in the pipeline needs to be emptied so as to ensure the accuracy of measurement.

【6】 An operator rotates the control knob of the operation mode of the load vehicle to an automatic mode; the operation modes of the load vehicle are automatic and manual, the load vehicle is in an automatic mode when in a traction power test, and the load vehicle is in a manual mode when in remote control driving and turning.

【7】 A driver drives a tested vehicle 1 and runs on a special test runway at a low gear and a stable speed;

【8】 An operator controls an operation interface remotely, and slowly increases the loading load of the load vehicle manually or automatically until the measurement parameters of the traction power, the traction force, the slip ratio, the oil consumption and the like of the gear are measured;

【9】 After the gear measurement is finished, unloading until the gear is 0, then prompting a driver to change another gear of the tested vehicle 1, and then driving at a stable speed;

【10】 Repeating the steps (8) and (9) until the gear with the maximum traction power of the vehicle 1 to be tested is measured;

【11】 If the traction force of the tested vehicle 1 or the traction force of a certain gear cannot overcome the friction force between the load vehicle and the ground, an operator remotely controls an operation interface at the moment, a loading motor is adjusted to a driving mode, and the loading motor provides a driving force for the load vehicle at the moment so as to overcome part of the friction force;

【12】 The operator slowly adjusts the magnitude of the driving force of the loading motor until the tested vehicle 1 reaches a tested state until the measurement parameters of the traction power, the traction force, the slip ratio, the oil consumption and the like of the tested vehicle 1 or the gear are measured;

【13】 Repeating the steps (11) and (12) until the gear with the maximum traction power of the tested vehicle 1 is measured;

【14】 After the test is finished, a driver drives the tested vehicle 1 to pull the load vehicle to be close to the parking position, and then the pin shaft 15 is removed;

【15】 An operator rotates the control knob of the operation mode of the load wagon to a manual mode;

【16】 An operator operates the remote controller of the load vehicle to control each loading motor of the load vehicle to rotate forwards or reversely, and sequentially control the load vehicle to advance, retreat and turn until the load vehicle finishes warehousing;

【17】 After warehousing is finished, firstly pressing a parking brake button to ensure that the load vehicle is in a braking state, then sequentially pressing a down converter stop button and an oil pump stop button, and then rotating a cooling system start-stop knob and a cooling system start-stop button to a stop state;

【18】 And finally, rotating a start-stop knob of the generator set 6 to a stop state, and closing the generator set 6.

This full-hanging traction performance test system adopts disk PMSM, four-quadrant frequency conversion wheel limit motor direct drive, need not traditional mechanical structure such as gearbox, transfer case, transmission shaft for the availability factor of load car has obtained very big improvement. The loading motor has two working states of driving and loading and is controlled and realized by the motor controller, and the design mode realizes a zero traction force loading test and meets the full-power test requirement of the load vehicle.

Meanwhile, the load vehicle is provided with a generator set 6, when the low-power tractor is used for a traction power test, the generator set supplies power to the permanent magnet synchronous motor, and the loading motor is used as a driving motor, so that the traction power test of the low-power tractor is completed. By adopting the mode, the traction performance test system can realize a zero-load loading test, realizes a traction loading test of a set of traction performance test system on a full-power section, and has the advantages of wide loading capacity, high loading efficiency and good economic performance.

The load vehicle is provided with a signal acquisition and communication system, based on a wireless communication technology, a GPS/Beidou positioning system and a measuring sensor, and a network service platform is utilized to realize remote real-time visual monitoring of various test data and real-time working states thereof when a tester carries out a traction power test on the tractor through self-development monitoring software, so that the accuracy and the effectiveness of the data obtained by the traction power test are ensured.

The load vehicle has the functions of advancing, retreating and steering, the loading motor is remotely controlled to start and steer through the remote controller, the automatic backing and warehousing can be realized without the traction of the tested vehicle, and the load vehicle does not need to be pulled by the tested vehicle at the moment. The parking and warehousing of the load vehicle are greatly facilitated, and the usability of a user is improved.

Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will recognize that changes may be made in the form and detail of the embodiments described herein without departing from the spirit and scope of the invention. The invention is intended to cover all modifications, equivalents and alternatives falling within the spirit and scope of the invention as defined by the appended claims.