CN107290152A - Electric Motor Wheel and intelligent suspension system multifunctional integrated experimental bench - Google Patents

Electric Motor Wheel and intelligent suspension system multifunctional integrated experimental bench Download PDF

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Publication number
CN107290152A
CN107290152A CN201610228109.XA CN201610228109A CN107290152A CN 107290152 A CN107290152 A CN 107290152A CN 201610228109 A CN201610228109 A CN 201610228109A CN 107290152 A CN107290152 A CN 107290152A
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CN
China
Prior art keywords
assembly
electric motor
wheel
motor wheel
transverse
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Pending
Application number
CN201610228109.XA
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Chinese (zh)
Inventor
徐建勋
王戡
张仪栋
周亮
谢东坡
严永福
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Chongqing Vehicle Test & Research Institute Co ltd
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Chongqing Vehicle Test & Research Institute Co ltd
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Priority to CN201610228109.XA priority Critical patent/CN107290152A/en
Publication of CN107290152A publication Critical patent/CN107290152A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G01MEASURING; TESTING
    • G01MTESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M17/00Testing of vehicles
    • G01M17/007Wheeled or endless-tracked vehicles

Abstract

The invention discloses a kind of Electric Motor Wheel and intelligent suspension system multifunctional integrated experimental bench, back timber and column, iron floor composition frame-type structure, hydraulic servo cylinder is arranged on iron floor by hydraulic cylinder fixed seat, hydraulic servo cylinder upper end is sequentially provided with drum assembly, Electric Motor Wheel, the Electric Motor Wheel is arranged in suspended rack assembly side, suspended rack assembly upper end is connected with transverse beam assembly lower end, suspended rack assembly can between drum assembly and transverse beam assembly spring slide, the transverse beam assembly can slide up and down in column;Weight is provided with transverse beam assembly, on the outside of the column of transverse beam assembly two ends lift cylinders are provided between iron floor, drum assembly both sides have been arranged symmetrically guide holder and timing belt component, speed changer is arranged on the outside of guide holder, transmission output shaft is connected with synchronization wheel shaft, electric dynamometer is fixed on iron floor and on the outside of speed changer, and advantage is can be while carry out Electric Motor Wheel performance test, the experiment of Electric Motor Wheel Brake energy recovery, intelligent suspension system experiment.

Description

Electric Motor Wheel and intelligent suspension system multifunctional integrated experimental bench
Technical field
The present invention relates to a kind of Electric Motor Wheel of Direct wheel drives electric automobile and intelligent suspension system multifunctional comprehensive examination Test platform.
Background technology
Eliminated using the Direct wheel drives electric automobile of wheel hub motor technology direct drive of wheel in orthodox car Combustion engine and concentrate motor driven electric car machine driven system, with it is simple for structure it is compact, using sky Between big, short driving-chain, transmission efficiency the characteristics of, be considered as the final drive form of electric automobile, be The emphasis and focus of domestic and international electric vehicle engineering research.However, due to wheel hub motor is introduced into wheel, it is whole The nonspring carried mass and vehicle wheel rotation inertia of car are dramatically increased, and the electronic vapour of Direct wheel drives is degrading to a certain extent The ride comfort and control stability of car.Intelligent suspension system based on Active suspension technology has damping force and position The characteristics of moving control in real time, by intelligent suspension and the match control of Electric Motor Wheel, can be effectively improved wheel side and drive The ride comfort and control stability of dynamic electric automobile.
Direct wheel drives electric automobile is during actual travel, and Electric Motor Wheel by road surface longitudinal direction except being hindered Outside power, individually it can only also be indulged simulated roadway by vertical vibration caused by Uneven road, current testing stand To resistance or vertical vibration, also lack while carrying out the testing stand of lengthwise movement loading and catenary motion loading Intelligent suspension system to Electric Motor Wheel and matched design is tested and evaluated, accordingly, it would be desirable to which it is more to develop one kind Functional Integration Test platform, to carry out Electric Motor Wheel and intelligent suspension system performance test and durability test.
The content of the invention
In view of this, the present invention provides a kind of Electric Motor Wheel and intelligent suspension system comprehensive experimental device, Ji Nengdan Lengthwise movement loading is solely carried out to Electric Motor Wheel or catenary motion loading is carried out to suspension system, and can be realized vertical To being loaded while motion and catenary motion, the road analogy of Electric Motor Wheel and intelligent suspension system is surveyed with realizing Examination.
The present invention solves the technical scheme that is used of above-mentioned technical problem:
A kind of Electric Motor Wheel and intelligent suspension system multifunctional integrated experimental bench, it is characterised in that:It is with including iron Plate, on iron floor two columns with certain distance are fixed with by fastening bolt, back timber is fixed on vertical The top of post, back timber and column, iron floor composition frame-type structure, hydraulic servo cylinder are solid by hydraulic cylinder Reservation is arranged on iron floor, and hydraulic servo cylinder upper end is sequentially provided with drum assembly, Electric Motor Wheel, described Electric Motor Wheel is arranged in suspended rack assembly side, and directive slide track, the directive slide track are provided with transverse beam assembly lower end Coordinate with the guide chute that the support base side in Electric Motor Wheel is set, the suspended rack assembly upper end and transverse beam assembly Lower end connect, suspended rack assembly can between drum assembly and transverse beam assembly spring slide, the transverse beam assembly can Slided up and down in column;Weight is provided with the transverse beam assembly, at transverse beam assembly two ends and positioned at vertical Lift cylinders are provided between iron floor on the outside of post, drum assembly both sides have been arranged symmetrically guide holder and timing belt Component, drum assembly side is connected by shaft coupling with timing belt component, roller opposite side and timing belt component Between torque speed sensor is installed, speed changer is arranged on the outside of guide holder, transmission output shaft with it is synchronous Wheel shaft is connected, and electric dynamometer is fixed on iron floor and on the outside of speed changer, electric dynamometer output Axle is connected with transmission input shaft.The advantage of the technical program is supplied power to by using electric dynamometer Then synchronizing wheel transmits power to drum assembly by synchronizing wheel, Electric Motor Wheel is imparted power to, due to hydraulic pressure The effect of servo actuator, cause and transverse beam assembly on be provided with weight, can adjust Electric Motor Wheel by Power, due to being slidably matched between column and transverse beam assembly, adds the elastic reaction of suspended rack assembly, Electric Motor Wheel It can freely be impacted very much in experimentation, the experiment to Electric Motor Wheel be completed, simultaneously because Electric Motor Wheel The impact being subject to can pass to suspended rack assembly, and the experiment to suspended rack assembly is together carried out.
Preferably:The drum assembly includes rolling stand, roller, drum shaft, rolling bearing, cover plate, Rolling stand lower end is connected with hydraulic servo start cylinder piston rod, and rolling stand both sides are provided with rolling bearing, rolling Cylinder is connected as one with drum shaft by key, and drum shaft is arranged on the bearing block of rolling stand both sides, rolling Tube stent upper end is provided with dismountable cover plate, the cover plate support Electric Motor Wheel.The technical scheme mainly passes through liquid Servo actuator support drum assembly is pressed, because of Electric Motor Wheel stress difference rolling can be moved up and down.
Preferably:The suspended rack assembly has in the support base that can be moved freely on directive slide track, support base Between be provided with oscillating bearing, support base is connected by oscillating bearing with Electric Motor Wheel, and Electric Motor Wheel is positioned at support base side End, support base upper end, which is provided with axle, axle, is cased with mass, and support base side is welded with guide chute, supports Seat upper end be sequentially provided with lower rotating disc, lower hinged seat, intelligent suspension actuator, force snesor, helical spring, Upper hinged seat, upper rotating disk, the upper rotating disk are arranged on above and below transverse beam assembly lower end, the helical spring Two ends are separately mounted on hinged seat and lower handing-over seat, and the intelligent suspension actuator is parallel with spring On hinged seat up and down.The structure by be provided with support base directive slide track coordinate guide chute, Electric Motor Wheel may be caused to move back and forth up and down all the time, and stress size is adjusted by mass, structure Simply, and by setting spring and intelligent suspension actuator to be tested to buffer, with realizing that effect is good Advantage.
Preferably:The transverse beam assembly has crossbeam, and crossbeam two ends are provided with shoulder hole, crossbeam and are provided with rolling Pearl linear bearing, crossbeam can be moved freely along column in vertical direction, and crossbeam upper end, which is provided with axle, axle, to be covered There is mass.By setting ball linear bearing, the friction between column and crossbeam can be reduced, examination is improved The accuracy tested.
Preferably:Line slide rail is installed, slide rail is provided with sliding block, sliding block and is provided with the guide holder Sliding bearing.By setting slide rail and sliding bearing to reduce the friction between coordinating, the accurate of experiment is improved Property.
Preferably:The timing belt component includes timing belt, synchronizing wheel, synchronization wheel shaft, timing belt connection two Synchronizing wheel, synchronizing wheel is connected with synchronization wheel shaft by key, and synchronization wheel shaft the inner passes through shaft coupling and roller Axle is connected, and synchronization wheel shaft outer end is installed on the sliding bearing of guide assemblies, and synchronization wheel shaft outer end passes through connection Axle device is connected with torque speed sensor.Enter action edge by synchronous pulley to transmit, power to the greatest extent can may be used Loss of energy is delivered in Electric Motor Wheel, while setting sensor, is easy to observe rotating speed, is conducive to Control experiment Process.
Preferably:Tensioning apparatus is fixed with guide holder, the tensioning apparatus includes pinch roller, pinch roller Axle, rocking arm, support bar, extension spring, pinch roller are arranged in the outside of timing belt, pinch roller and pressure Belt shaft is connected by key, and belt wheel is arranged in the middle of the upper end of rocking arm, rocking arm and is provided with support bar, Support bar one end is connected with rocking arm, and the other end is connected with extension spring, and the extension spring is located at timing belt two Side, extension spring is fixed on support bar, and rocking arm lower end is arranged on guide holder by rolling bearing.Pass through Extension spring is set to move rocking arm to the direction that timing belt is tensioned, it is ensured that timing belt transmits the effect of power Rate, while being also beneficial to adjust the tensioning degree of timing belt.
Beneficial effect
The beneficial effects of the invention are as follows:By set the present apparatus can carry out single Electric Motor Wheel performance test, The experiment of Electric Motor Wheel Brake energy recovery, intelligent suspension system experiment, Electric Motor Wheel controller and intelligent Suspension control Device development experiments, can also simulate actual road traveling operating mode while carrying out longitudinal direction and catenary motion load test, With the combination property for the intelligent suspension system for testing Electric Motor Wheel and matched design.
Brief description of the drawings
Fig. 1 is the structural representation of experimental rig in the present invention
Fig. 2 is the structural representation of drum assembly
Fig. 3 is suspension and the structural representation of Electric Motor Wheel
Fig. 4 is the structural representation between timing belt component and roller
Embodiment
For the technical characterstic for illustrating this programme can be understood, below by an embodiment, and combine attached Figure, is illustrated to this programme.
Electric Motor Wheel of the present invention and intelligent suspension system multifunctional integrated experimental bench, as shown in figure 1, Electric Motor Wheel and intelligence Can suspension system multifunctional integrated experimental bench, including include iron floor 18, column 3, back timber 1, hydraulic cylinder and fix Seat 17, hydraulic servo cylinder 7, drum assembly 5, Electric Motor Wheel 11, suspended rack assembly 10, directive slide track 4, Transverse beam assembly 2, lift cylinders 14, shaft coupling 13, torque speed sensor 6, guide holder 12, timing belt group Part 15, tensioning apparatus 16, speed changer, electric dynamometer 8, the column lower end face are solid by fastening bolt It is scheduled on iron floor, back timber is fixed on the top of column, back timber and column, iron floor composition frame-type structure, Hydraulic servo cylinder is arranged on iron floor by hydraulic cylinder fixed seat, and hydraulic servo cylinder upper end is successively Provided with drum assembly, Electric Motor Wheel, suspended rack assembly, directive slide track, transverse beam assembly, lift cylinders are arranged on column Outside, drum assembly both sides have been arranged symmetrically guide holder and timing belt component, and drum assembly side passes through shaft coupling Device is connected with timing belt component, and torque speed sensor is provided between roller opposite side and timing belt component, Tensioning apparatus is fixed on guide holder, speed changer 9 be arranged on guide holder on the outside of, transmission output shaft with it is synchronous Wheel shaft is connected, and electric dynamometer is fixed on iron floor and on the outside of speed changer, electric dynamometer output Axle is connected with transmission input shaft.
In the present embodiment, as shown in Fig. 2 the drum assembly includes rolling stand 22, roller 20, roller Axle 23, rolling bearing 21, cover plate 19, rolling stand lower end are connected with hydraulic servo start cylinder piston rod, rolling Tube stent both sides are provided with rolling bearing, and roller is connected as one with drum shaft by key, and drum shaft is arranged on On the bearing block of rolling stand both sides, rolling stand upper end is provided with dismountable cover plate.
In the present embodiment, as shown in figure 3, the suspended rack assembly has what can be moved freely on directive slide track Oscillating bearing 34 is provided with the middle of support base 29, support base, support base is connected by oscillating bearing with Electric Motor Wheel, Support base side is welded with guide chute 35, support base upper end be sequentially provided with lower rotating disc 28, lower hinged seat 27, Intelligent suspension actuator 33, force snesor 32, helical spring 26, upper hinged seat 25, upper rotating disk 24; The upper rotating disk is arranged on transverse beam assembly lower end, and the helical spring upper and lower ends are separately mounted to be hinged On seat and lower handing-over seat, the intelligent suspension actuator is parallel with spring to be arranged on hinged seat up and down.
In the present embodiment, as shown in figure 1, the transverse beam assembly has crossbeam, crossbeam two ends are provided with shoulder hole, Ball linear bearing is installed, crossbeam can be moved freely along column in vertical direction, crossbeam upper end in crossbeam Provided with axle, mass is cased with axle.
Line slide rail is installed, slide rail is provided with sliding block, sliding block and is provided with sliding bearing on the guide holder 42。
In the present embodiment, as shown in figure 4, the timing belt component include timing belt 36, it is synchronizing wheel 38, same Wheel shaft 37 is walked, timing belt connects two synchronizing wheels, and synchronizing wheel is connected with synchronization wheel shaft by key, synchronizing wheel Axle the inner is connected by shaft coupling with drum shaft, and synchronization wheel shaft outer end is installed to the sliding bearing of guide assemblies On, synchronization wheel shaft outer end is connected by shaft coupling with torque speed sensor.
In the present embodiment, as shown in figure 4, the tensioning apparatus includes pinch roller 39, belt wheel 40, shaken Arm 44, support bar 41, extension spring 43, pinch roller are arranged in the outside of timing belt 36, pinch roller It is connected with belt wheel by key, belt wheel is arranged in the middle of the upper end of rocking arm, rocking arm and is provided with branch Strut, extension spring is fixed on support bar, and rocking arm lower end is arranged on guide holder by rolling bearing.
When carrying out Electric Motor Wheel performance test, hydraulic servo actuator is remained stationary as, and controls lift cylinders by crossbeam liter Rise, cover plate of dismantling, Electric Motor Wheel and intelligent suspension system are installed, Electric Motor Wheel is pressed on roller, electric power measurement of power Machine output torque and rotating speed under the control of a computer system, power by timing belt component passes to roller, To simulate the load that Electric Motor Wheel is subject to.
When carrying out the experiment of Electric Motor Wheel Brake energy recovery, hydraulic servo actuator is remained stationary as, and controls lift cylinders Crossbeam is risen, cover plate of dismantling, Electric Motor Wheel and intelligent suspension system is installed, Electric Motor Wheel is pressed on roller, Switch on power driving Electric Motor Wheel, drives flywheel mechanism to rotate by the torque transmission of roller and timing belt component, when Electric Motor Wheel is cut off the electricity supply when reaching certain rotating speed, allows flywheel mechanism to be rotated by roller driving electric wheel, according to system Fixed control strategy is controlled to regenerative braking, and measures regenerating braking energy.
When carrying out intelligent suspension suspension system vibration test, disconnect the shaft coupling at roller two ends make roller with it is synchronous Band components apart, cover plate is arranged on rolling stand, lift cylinders processed rise crossbeam, installs Electric Motor Wheel and intelligence Can suspension system, make Electric Motor Wheel compress on the cover board, adjustment crossbeam and support frame on mass to realize on spring, The regulation of unsprung mass, electro-hydraulic servo actuator exports the actual pavement behavior of simulation under computer system control Accumulation signal, rolling stand driving electric wheel vibrates together with electro-hydraulic servo actuator piston rod, and vibration passes through Intelligent suspension actuator and helical spring are delivered to crossbeam, make crossbeam along column up-down vibration, intelligent suspension is made Dynamic device produces damping-force adjustable according to acceleration signal on spring, under spring and corresponding control strategy with vibration, with Play a part of reducing vibration.
When carrying out integrating load test, control lift cylinders rise crossbeam, install Electric Motor Wheel and intelligent suspension system System, makes Electric Motor Wheel be compressed on roller, starts Hydrauservo System and electric dynamometer, hydraulic servo actuator Roller is driven to carry out vertical vibration, roller drives synchronizing wheel along slide rail catenary motion, dynamometer machine by shaft coupling Moment of torsion and rotating speed by the way that in timing belt component passes to roller, loading is rotated.Because synchronizing wheel exists The vibration of vertical direction causes synchronizing wheel centre-to-centre spacing to change, and tightness of synchronous belt degree produces change, when synchronizing wheel along When slide rail vibrates on vertical direction, tensioning wheel rocking arm is swung therewith under spring extension effect, and extension spring is long Degree is changed, and timing belt is effectively tensioned, it is ensured that power is transmitted.
Although indeed, it will be appreciated that description above has been carried out by the example of the present invention, to this hair The bright such and other improvement that will be apparent to those skilled in the science made and change are deemed to fall Such as set forth herein broad range of the present invention in.Therefore, although the present invention reference has been made to preferred embodiment It is described, still, its meaning is not that the equipment for making tool novelty is restricted therefrom, on the contrary, it is intended to Including meeting part disclosed above, the various improvement within the broad range of claim and equivalent modifications.

Claims (7)

1. a kind of Electric Motor Wheel and intelligent suspension system multifunctional integrated experimental bench, it is characterised in that:It is with including iron Plate, on iron floor two columns with certain distance are fixed with by fastening bolt, back timber is fixed on vertical The top of post, back timber and column, iron floor composition frame-type structure, hydraulic servo cylinder are solid by hydraulic cylinder Reservation is arranged on iron floor, and hydraulic servo cylinder upper end is sequentially provided with drum assembly, Electric Motor Wheel, described Electric Motor Wheel is arranged in suspended rack assembly side, and directive slide track, the directive slide track are provided with transverse beam assembly lower end Coordinate with the guide chute that the support base side in Electric Motor Wheel is set, the suspended rack assembly upper end and transverse beam assembly Lower end connect, suspended rack assembly can between drum assembly and transverse beam assembly spring slide, the transverse beam assembly can Slided up and down in column;Weight is provided with the transverse beam assembly, at transverse beam assembly two ends and positioned at vertical Lift cylinders are provided between iron floor on the outside of post, drum assembly both sides have been arranged symmetrically guide holder and timing belt Component, drum assembly side is connected by shaft coupling with timing belt component, roller opposite side and timing belt component Between torque speed sensor is installed, speed changer is arranged on the outside of guide holder, transmission output shaft with it is synchronous Wheel shaft is connected, and electric dynamometer is fixed on iron floor and on the outside of speed changer, electric dynamometer output Axle is connected with transmission input shaft.
2. Electric Motor Wheel according to claim 1 and intelligent suspension system multifunctional integrated experimental bench, its feature It is:The drum assembly includes rolling stand, roller, drum shaft, rolling bearing, cover plate, roller branch Frame lower end is connected with hydraulic servo start cylinder piston rod, and rolling stand both sides are provided with rolling bearing, roller and rolling Cylinder axle is connected as one by key, and drum shaft is arranged on the bearing block of rolling stand both sides, rolling stand Upper end is provided with dismountable cover plate, the cover plate support Electric Motor Wheel.
3. Electric Motor Wheel according to claim 1 and intelligent suspension system multifunctional integrated experimental bench, its feature It is:The suspended rack assembly has to be provided with the middle of the support base that can be moved freely on directive slide track, support base Oscillating bearing, support base is connected by oscillating bearing with Electric Motor Wheel, and Electric Motor Wheel is located at support base side, branch Support seat upper end, which is provided with axle, axle, is cased with mass, and support base side is welded with guide chute, support base upper end It is sequentially provided with lower rotating disc, lower hinged seat, intelligent suspension actuator, force snesor, helical spring, upper hinge Joint chair, upper rotating disk, the upper rotating disk are arranged on transverse beam assembly lower end, the helical spring upper and lower ends It is separately mounted on hinged seat and lower handing-over seat, the intelligent suspension actuator installation parallel with spring On hinged seat up and down.
4. Electric Motor Wheel according to claim 1 and intelligent suspension system multifunctional integrated experimental bench, its feature It is:The transverse beam assembly has crossbeam, and crossbeam two ends are provided with shoulder hole, crossbeam and are provided with ball straight line Bearing, crossbeam can be moved freely along column in vertical direction, and crossbeam upper end is provided with axle, axle and is cased with quality Block.
5. Electric Motor Wheel according to claim 1 and intelligent suspension system multifunctional integrated experimental bench, its feature It is:Line slide rail is installed, slide rail is provided with sliding block, sliding block and is provided with sliding axle on the guide holder Hold.
6. Electric Motor Wheel according to claim 1 and intelligent suspension system multifunctional integrated experimental bench, its feature It is:The timing belt component includes timing belt, synchronizing wheel, synchronization wheel shaft, and timing belt connects two synchronizing wheels, Synchronizing wheel is connected with synchronization wheel shaft by key, and synchronization wheel shaft the inner is connected by shaft coupling with drum shaft, Synchronization wheel shaft outer end is installed on the sliding bearing of guide assemblies, and synchronization wheel shaft outer end is by shaft coupling with turning round Square speed probe is connected.
7. Electric Motor Wheel according to claim 1 and intelligent suspension system multifunctional integrated experimental bench, its feature It is:Tensioning apparatus is fixed with guide holder, the tensioning apparatus includes pinch roller, belt wheel, shaken Arm, support bar, extension spring, pinch roller are arranged in the outside of timing belt, pinch roller and belt wheel It is connected by key, belt wheel is arranged in the middle of the upper end of rocking arm, rocking arm and is provided with support bar, supports Bar one end is connected with rocking arm, and the other end is connected with extension spring, and the extension spring is located at timing belt both sides, Extension spring is fixed on support bar, and rocking arm lower end is arranged on guide holder by rolling bearing.
CN201610228109.XA 2016-04-11 2016-04-11 Electric Motor Wheel and intelligent suspension system multifunctional integrated experimental bench Pending CN107290152A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610228109.XA CN107290152A (en) 2016-04-11 2016-04-11 Electric Motor Wheel and intelligent suspension system multifunctional integrated experimental bench

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Application Number Priority Date Filing Date Title
CN201610228109.XA CN107290152A (en) 2016-04-11 2016-04-11 Electric Motor Wheel and intelligent suspension system multifunctional integrated experimental bench

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Publication Number Publication Date
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107957340A (en) * 2017-12-22 2018-04-24 重庆长安汽车股份有限公司 Automobile a quarter suspension and damper simulation working condition tests platform
CN108414247A (en) * 2018-03-09 2018-08-17 西安交通大学 A kind of electric automobile energy recycling suspension property and parameter designing test-bed and test method
CN110068465A (en) * 2019-04-30 2019-07-30 南京理工自动化研究院有限公司 A kind of new-energy automobile braking energy source recovery test equipment

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107957340A (en) * 2017-12-22 2018-04-24 重庆长安汽车股份有限公司 Automobile a quarter suspension and damper simulation working condition tests platform
CN108414247A (en) * 2018-03-09 2018-08-17 西安交通大学 A kind of electric automobile energy recycling suspension property and parameter designing test-bed and test method
CN110068465A (en) * 2019-04-30 2019-07-30 南京理工自动化研究院有限公司 A kind of new-energy automobile braking energy source recovery test equipment
CN110068465B (en) * 2019-04-30 2020-05-19 南京理工自动化研究院有限公司 New energy automobile braking energy recovery test equipment

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Inventor after: Wang Kan

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Inventor after: Zhou Liang

Inventor after: Xie Dongpo

Inventor after: Yan Yongfu

Inventor before: Xu Jianxun

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Inventor before: Zhang Yidong

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Inventor before: Xie Dongpo

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