CN109738200A - The test method of vehicle manual braking experimental rig and vehicle dynamic brake performance - Google Patents
The test method of vehicle manual braking experimental rig and vehicle dynamic brake performance Download PDFInfo
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- CN109738200A CN109738200A CN201811632503.5A CN201811632503A CN109738200A CN 109738200 A CN109738200 A CN 109738200A CN 201811632503 A CN201811632503 A CN 201811632503A CN 109738200 A CN109738200 A CN 109738200A
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Abstract
The invention discloses the test methods of a kind of vehicle manual braking experimental rig and vehicle dynamic brake performance, vehicle manual braking's experimental rig includes control unit, braking parts, brake operating platform, measuring device, multiple wheel portions and multiple driving portions, each wheel portion includes wheel, each driving portion is respectively used to one wheel rotation of corresponding driving, control unit is for controlling driving portion to the output power in wheel portion, braking parts are suitable for braking wheel, brake operating platform includes manual braking's pedal, manual braking's pedal is connect with braking parts, to drive braking parts brake wheel, measuring device is suitable for implementing to measure in wheel braking torque and the revolving speed of each wheel.Vehicle according to the invention manual braking's experimental rig can simulate and carry out retardation test to multiple wheels of vehicle, and can during wheel braking test carriage wheel dynamic torque and revolving speed variation, so as to more accurately assess the brake condition of vehicle.
Description
Technical field
The present invention relates to vehicle testing fields, dynamic in particular to a kind of vehicle manual braking experimental rig and vehicle
The test method of state braking ability.
Background technique
In the related technology, vehicle needs to test the braking ability of vehicle before batch production, existing vehicle people
Dynamic braking experimental rig once can only carry out braking performance test to wheel, can not multiple wheels to vehicle carry out simultaneously
Braking performance test, while static brake pressure can only be carried out to wheel and tested, wheel can not be reflected in braking process transfer
The dynamic change of speed and the torque being subject to, test result can not accurate response truth.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
First aspect proposes a kind of vehicle manual braking of brake condition that can more accurately assess vehicle at least to a certain extent
Experimental rig.
The second aspect of the present invention proposes a kind of dynamic with vehicle is carried out using above-mentioned vehicle manual braking experimental rig
The test method of state braking ability.
Vehicle manual braking's experimental rig according to a first aspect of the present invention, including control unit, braking parts, braking behaviour
Make platform, measuring device, multiple wheel portions and multiple driving portions, each wheel portion includes wheel, each driving portion
It is respectively used to the corresponding driving one wheel rotation, the control unit is for controlling the driving portion to the defeated of the wheel portion
Power out, the braking parts are suitable for braking the wheel, and the brake operating platform includes manual braking's pedal, the people
Dynamic braking pedal is connect with the braking parts, and to drive the braking parts to brake the wheel, the measuring device is suitable in institute
Implement torque and the revolving speed of each wheel of measurement when stating wheel braking.
Vehicle manual braking's experimental rig according to a first aspect of the present invention, can simulate multiple wheels to vehicle
Carry out retardation test, and can during wheel braking test carriage wheel dynamic torque and revolving speed variation, so as to more quasi-
Really assess the brake condition of vehicle.
Vehicle manual braking experimental rig according to the present invention, the wheel braking experimental rig further includes environment
Room, the environmental chamber is interior to be equipped with chassis portion, and the environmental chamber has the first side being oppositely arranged and second side, the wheel portion packet
Multiple groups are included, wheel portion described in every group includes the wheel portion that first side is arranged in and a setting described the
The wheel portion of two sides, the wheel portion further include: axletree, each axletree are connect with the chassis portion.
Further, each driving portion is arranged at the side that the wheel portion deviates from the environmental chamber.
Further, each driving portion includes bottom platform, driving motor, flywheel bindiny mechanism, the driving
Motor and the flywheel bindiny mechanism are installed in the bottom platform, the braking parts by the flywheel bindiny mechanism with
The wheel portion connection.
Further, the flywheel bindiny mechanism includes inertial flywheel and shaft coupling, the braking parts and the inertia
Flywheel connection, the axletree are connect by the shaft coupling with the inertial flywheel.
Further, the driving portion further includes flywheel disassembling mechanism, and the flywheel disassembling mechanism and the flywheel connect
Connection mechanism connects and is used to dismantle the flywheel bindiny mechanism.
Vehicle manual braking experimental rig according to the present invention, the environmental chamber is interior to be equipped with hoisting mechanism.
Vehicle manual braking experimental rig according to the present invention, the control unit include computer and control cabinet, described
Computer is suitable for manipulating the driving portion by the control cabinet, and the control cabinet is further adapted for powering to the driving portion.
The test method of the vehicle dynamic brake performance according to a second aspect of the present invention, utilizes first party such as of the present invention
Vehicle manual braking experimental rig described in face, the test method include the following steps:
Step a: the driving portion is enabled to apply driving force to the wheel portion by the control unit, to drive the wheel
Rotation；
Step b: the driving portion is enabled to apply the load of simulated roadway frictional force to the wheel portion by the control unit；
Step c: the braking parts are operated by the brake operating platform and brake the wheel, the measuring device records institute
State torque and rotation speed change of the wheel in braking process.
The test method of the vehicle dynamic brake performance according to a second aspect of the present invention, can be with simulating vehicle in reality
The brake condition of vehicle in road driving, so as to more accurately assess the brake condition of vehicle.
The test method of vehicle dynamic brake performance according to the present invention, the vehicle manual braking experimental rig is also
Including nature imitation experiment device, the nature imitation experiment device is connected with the control unit, the test method further include:
Step d: emulation platform is established by the nature imitation experiment device, the frictional force of road conditions where setting vehicle；
Step e: the test of vehicle braking process simulation is carried out according to the nature imitation experiment device, obtains the wheel described
The load parameter given in the test of vehicle braking process simulation by road；
Step f: the load parameter is transferred to the driving portion by the nature imitation experiment device, so that the driving portion obtains
The simulated roadway frictional force load out.
Additional aspect and advantage of the invention will be set forth in part in the description, and will partially become from the following description
Obviously, or practice through the invention is recognized.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures
Obviously and it is readily appreciated that, in which:
Fig. 1 is the structural schematic diagram of vehicle manual braking's experimental rig of the embodiment of the present invention；
Fig. 2 is the structural schematic diagram of the braking parts of the embodiment of the present invention；
Fig. 3 is the flow chart of the test method of the vehicle dynamic brake performance of the embodiment of the present invention.
Appended drawing reference:
Vehicle manual braking experimental rig 100, wheel portion 1, wheel 11, axletree 12, driving portion 2, bottom platform 21 are driven
Dynamic motor 22, flywheel bindiny mechanism 23, flywheel disassembling mechanism 24, control unit 3, computer 31, control cabinet 32, braking parts 4, braking behaviour
Make platform 5, manual braking's pedal 51, seat 52, measuring device 6, environmental chamber 7, hoisting mechanism 71, chassis portion 8.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end
Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached
The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance
Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or
Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is at least two, such as two
It is a, three etc., unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected or can communicate with each other；It can be directly connected, can also indirectly connected through an intermediary, it can
To be the interaction relationship of connection or two elements inside two elements.For the ordinary skill in the art,
The specific meanings of the above terms in the present invention can be understood according to specific conditions.
With reference to the accompanying drawing and with reference to the specific embodiment description present invention.
Fig. 1 and Fig. 2 is combined to describe the vehicle manual braking experimental rig 100 of the embodiment of the present invention first.
As depicted in figs. 1 and 2, the vehicle manual braking experimental rig 100 of the embodiment of the present invention may include control unit 3,
Braking parts 4, brake operating platform 5, measuring device 6, multiple wheel portions 1 and multiple driving portions 2, each wheel portion 1 include wheel
11, each driving portion 2 is respectively used to corresponding one wheel 11 of driving and rotates.
As shown in Figure 1, control unit 3 is for controlling driving portion 2 to the output power in wheel portion 1, brake operating platform 5 includes people
Dynamic braking pedal 51, manual braking's pedal 51 are connect with braking parts 4, thus when personnel trample manual braking's pedal 51, manpower
Brake pedal 51 can drive 4 brake wheel 11 of braking parts.
When carrying out vehicle braking test using vehicle manual braking experimental rig 100, can be driven first by control unit 3
Motor car wheel 11 rotates, to simulate actual vehicle driving process.Further, personnel trample manual braking on brake operating platform 5 and step on
Plate 51, so that manual braking's pedal 51 drives 4 brake wheel 11 of braking parts, measuring device 6 is implemented when wheel 11 is braked at this time
Measure torque and the revolving speed of each wheel 11.Then, personnel can brake according to the wheel 11 that measuring device 6 measures in wheel 11
The multidate information of torque and rotation speed change analysis wheel 11 in 11 braking process of wheel in the process, accurate evaluation braking parts 4
To the braking ability of wheel 11 in 11 braking process of wheel.
In addition, braking parts 4 can brake multiple wheels 11, thus by measuring device 6, it can be more realistically anti-
The vehicle torque of each wheel and rotation speed change situation in braking process are reflected, more accurately to assess braking parts 4 in wheel 11
To the braking ability of wheel 11 in braking process.
Vehicle manual braking experimental rig 100 according to an embodiment of the present invention passes through setting control unit 3, braking parts 4, system
Dynamic station 5, measuring device 6, multiple wheel portions 1 and multiple driving portions 2, multiple wheel portions 1 can be simulated to the multiple of vehicle
Wheel 11 carries out retardation test, and measuring device 6 can test the dynamic torque of wheel 11 and be turned in 11 braking process of wheel
The variation of speed, so as to more accurately assess the brake condition of vehicle.
In some optional embodiments of the invention, measuring device 6 can be the wheel 11 or vehicle that wheel portion 1 is arranged in
Speed probe or/and torque sensor on wheel shaft 12, the thus accurate test carriage in 11 braking process of wheel of measuring device 6
Take turns the variation of 11 dynamic torques and revolving speed.
In some specific embodiments, as shown in Figure 1, vehicle manual braking experimental rig 100 further includes environmental chamber 7,
Chassis portion 8 is equipped in environmental chamber 7, chassis portion 8 can simulate the chassis of actual vehicle, and environmental chamber 7 has first be oppositely arranged
Side and second side, wheel portion 1 include multiple groups, and every group of wheel portion 1 includes that a wheel portion 1 that the first side is arranged in and one set
It sets in the wheel portion 1 of second side, wheel portion 1 further includes axletree 12, and wheel 11 is rotated around the center of corresponding axletree 12, often
A axletree 12 is connect with chassis portion 8.
As a result, chassis portion 8 and multiple wheel portions 1 can common simulating vehicle chassis and the wheel that is connect with chassis
11, to improve the test authenticity of vehicle manual braking experimental rig 100.
Since there are four running vehicle wheels for tool in most of automobiles, in some instances, as shown in Figure 1, wheel portion 1 and driving
Portion 2 all can be four, and the wheel 11 in four wheel portions 1 can be with four running vehicle wheels in simulated automotive.
In some specific embodiments, braking parts 4 can be brake disc or brake caliper, and brake disc or brake caliper are logical
Bolt is crossed to be fixed in the suspension system in chassis portion 8.In some instances, brake disc or brake caliper can directly by with vehicle
Wheel 11 rubs and brakes to wheel 11.In other examples, brake disc or brake caliper can also be by rubbing or pressing from both sides
Axletree 12 is held, axletree 12 is braked, and then wheel 11 is braked indirectly.
Specifically, as shown in Figure 1, each driving portion 2 is arranged at the side that wheel portion 1 deviates from environmental chamber 7.It drives as a result,
Dynamic portion 2 may be located remotely from environmental chamber 7, in order to the installation of driving portion 2, while convenient for the installation in chassis portion 8 in environmental chamber 7.
Specifically, as shown in Fig. 2, each driving portion 2 includes bottom platform 21, driving motor 22, flywheel bindiny mechanism
23, bottom platform 21 can be placed on the ground, and driving motor 22 and flywheel bindiny mechanism 23 are installed in bottom platform 21,
So that driving motor 22 and flywheel bindiny mechanism 23 keep stablizing when working, braking parts 4 pass through flywheel bindiny mechanism 23 and wheel
Portion 1 connects, and thus flywheel bindiny mechanism 23 can load braking parts 4 by the kinetic energy of storage, to brake in braking parts 4
The torque and rotation speed change of wheel 11 when can more accurately reflect 4 brake wheel 11 of braking parts of vehicle when wheel portion 1.
More specifically, as shown in Fig. 2, flywheel bindiny mechanism 23 includes inertial flywheel and shaft coupling, braking parts 4 and inertia
Flywheel connection, axletree 12 are connect by shaft coupling with inertial flywheel, shaft coupling can guarantee axletree 12 and inertial flywheel it
Between connective stability, inertial flywheel can load braking parts 4 by the kinetic energy of storage, to brake vehicle in braking parts 4
The torque and rotation speed change of wheel 11 when can more accurately reflect 4 brake wheel 11 of braking parts of vehicle when wheel portion 1.
More specifically, as shown in Fig. 2, driving portion 2 further includes flywheel disassembling mechanism 24, flywheel disassembling mechanism 24 and flywheel
Bindiny mechanism 23 connects, and flywheel disassembling mechanism 24 can be used for dismantling flywheel bindiny mechanism 23, after dismantling flywheel bindiny mechanism 23,
Wheel portion 1 can be unloaded, to be convenient for changing the braking parts 4 of different model or different structure, to test different braking portion 4 to vehicle
The braking effect of wheel 11.
In some specific embodiments, hoisting mechanism 71 is equipped in environmental chamber 7.In some instances, hoisting mechanism 71
It can be hoisting machine common in the art.All parts in chassis portion 8 can be lifted on environmental chamber 7 by hoisting mechanism 71
It is interior, so that the installation in chassis portion 8 is more convenient.
Specifically, as shown in Figure 1, control unit 3 includes computer 31 and control cabinet 32, computer 31 is suitable for grasping by control cabinet 32
Driving portion 2 is controlled, personnel input the moment information to wheel 11 by computer 31, and then computer 31 controls control cabinet 32 according to torque
Information drives driving portion 2 to rotate wheel 11 to rotating speed of target and target torque, and control cabinet 32 is further adapted for powering to driving portion 2, with
Realize driving of the driving motor 22 to wheel 11.
In some specific embodiments, as shown in Figure 1, brake operating platform 5 fixes on the ground, on brake operating platform 5
Equipped with seat 52, occupant can be rided on seat 52.When on seat 52, manual braking steps on passenger riding
Plate 51 is located at the front of occupant, and thus occupant, which can ride on seat 52, tramples manual braking's pedal 51, so that manpower
Brake pedal 51 drives 4 brake wheel 11 of braking parts, and the brake operating of manual braking's pedal 51 is more convenient.
Using the vehicle manual braking experimental rig 100 of the embodiment of the present invention, can be opened before vehicle does not build completion
Open up the thermal shock retardation test to the braking system of vehicle, the test of ramp continuous braking, the test of pressure stabilizing speed-changing braking, wet type parking
It is retardation test, the wheels-locked testing of speed stabilizing transformation, speed change wheels-locked testing, primary braking transformation test, the wheels-locked testing of transformation speed change, air-cooled
Wheels-locked testing, the test of dry type stopping brake, static friction test, running-in test, rate of wear test, brake efficiency test, braking
Test, Brake pad, gasket wear test, the quiet potency test of parking, the dynamic potency test of parking are replied in device heat fading, are realized to vehicle
Braking effect effective verifying.
Meanwhile using the vehicle manual braking experimental rig 100 of the embodiment of the present invention, the acceleration of automotive vehicle can be simulated
The wheels stress conditions such as operating condition, coasting mode, decelerating mode, automatic Pilot process execute outer brake order and follow situation
Test and feedback, verify the control strategy of Function for Automatic Pilot and the accuracy of control logic, integrality.
The test method of the vehicle dynamic brake performance of the embodiment of the present invention is described below with reference to Fig. 3.
The test method of the vehicle dynamic brake performance of the embodiment of the present invention is utilized such as any of the above-described kind of embodiment of the invention
Vehicle manual braking experimental rig 100.As shown in figure 3, test method includes the following steps:
Step a: enabling driving portion 2 apply driving force to wheel portion 1 by control unit 3, to drive wheel 11 to rotate；
Step b: driving portion 2 is enabled to apply the load of simulated roadway frictional force to wheel portion 1 by control unit 3, simulated roadway rubs
Corresponding change can be carried out according to the load of the frictional force on the road surface that the vehicle of actual verification is travelled by wiping power load；
Step c: 4 brake wheel 11 of braking parts is operated by brake operating platform 5, measuring device 6 records wheel 11 and braking
Torque and rotation speed change in the process.
The test method of vehicle dynamic brake performance according to an embodiment of the present invention, by being tested using vehicle manual braking
Device 100 can simulate vehicle traveling on different roads, realize in laboratory according to above-mentioned steps in braking process
Braking performance test function under different road conditions is tested, the perfect in shape and function of the Brake energy recovery control logic of vehicle is verified, it is complete
The preliminary staking-out work of pairs of braking energy control strategy completes the preliminary Bench calibration explained vehicle braking torque and works,
It is effective to save vehicle nominal time and actual place nominal time, break the excessive dependence to low temperature calibration environment, shortens whole
It the vehicle development cycle, is of great significance.
In some specific embodiments, vehicle manual braking experimental rig 100 further includes nature imitation experiment device, and emulation is real
Experiment device is connected with control unit 3.In some instances, nature imitation experiment device can be the computer 31 of control unit 3, as shown in figure 3,
Test method further include:
Step d: establishing emulation platform by nature imitation experiment device, and emulation platform can be virtual digit simulation software, if
The frictional force of road conditions where determining vehicle；
Step e: the test of vehicle braking process simulation is carried out according to nature imitation experiment device, obtains wheel 11 in vehicle braking mistake
The load parameter given in journey l-G simulation test by road；
Step f: load parameter is transferred to driving portion 2 by nature imitation experiment device, so that driving portion 2 obtains simulated roadway friction
Power load.
It is understood that as shown in figure 3, step d, step e and step f before step b, thus in driving portion 2
The load of simulated roadway frictional force can be applied in wheel portion 1 by driving portion 2 after obtaining the load of simulated roadway frictional force.It is imitative
True experiment device and step d, step e and step f can be before applying the load of simulated roadway frictional force to wheel portion 1 to actual
Road friction power is verified in advance, so that it is truer to the application simulated roadway frictional force load value of wheel portion 1, with more acurrate
Ground reflects brake condition of the vehicle when running on the road simulated.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not
It must be directed to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be in office
What can be combined in any suitable manner in one or more embodiment or examples.In addition, those skilled in the art can say this
Different embodiments or examples described in bright book are engaged and are combined.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example
Property, it is not considered as limiting the invention, those skilled in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, modifies, replacement and variant.
Claims (10)
1. a kind of vehicle manual braking experimental rig characterized by comprising
Multiple wheel portions, each wheel portion includes: wheel；
Multiple driving portions, each driving portion are respectively used to the corresponding driving one wheel rotation；
Control unit, the control unit is for controlling the driving portion to the output power in the wheel portion；
Braking parts, the braking parts are suitable for braking the wheel；
Brake operating platform, the brake operating platform include: manual braking's pedal, and manual braking's pedal and the braking parts connect
It connects, to drive the braking parts to brake the wheel；
Measuring device, the measuring device are suitable for implementing to measure in the wheel braking torque of each wheel and turn
Speed.
2. vehicle manual braking experimental rig according to claim 1, which is characterized in that the wheel braking experimental rig
Further include: environmental chamber, the environmental chamber is interior to be equipped with chassis portion, and the environmental chamber has the first side being oppositely arranged and second side,
The wheel portion includes multiple groups, and wheel portion described in every group includes the wheel portion that first side is arranged in and one
The wheel portion of described second side, the wheel portion are set further include: axletree, each axletree with the bottom
Pan portion connection.
3. vehicle manual braking experimental rig according to claim 2, which is characterized in that each driving portion is arranged at institute
State the side that wheel portion deviates from the environmental chamber.
4. vehicle manual braking experimental rig according to claim 2, which is characterized in that each driving portion wraps
Include: bottom platform, driving motor, flywheel bindiny mechanism, the driving motor and the flywheel bindiny mechanism are installed in described
In bottom platform, the braking parts are connect by the flywheel bindiny mechanism with the wheel portion.
5. vehicle manual braking experimental rig according to claim 4, which is characterized in that the flywheel bindiny mechanism packet
Include: inertial flywheel and shaft coupling, the braking parts are connect with the inertial flywheel, and the axletree passes through the shaft coupling and institute
State inertial flywheel connection.
6. vehicle manual braking experimental rig according to claim 4, which is characterized in that the driving portion further include: fly
Disassembly mechanism is taken turns, the flywheel disassembling mechanism connect with the flywheel bindiny mechanism and is used to dismantle the flywheel bindiny mechanism.
7. vehicle manual braking experimental rig according to claim 2, which is characterized in that be equipped with lifting in the environmental chamber
Mechanism.
8. vehicle manual braking experimental rig according to claim 1, which is characterized in that the control unit includes: computer
And control cabinet, the computer are suitable for manipulating the driving portion by the control cabinet, the control cabinet is further adapted for the driving
Portion's power supply.
9. a kind of test method of vehicle dynamic brake performance, which is characterized in that the test method utilizes such as claim 1-8
Any one of described in vehicle manual braking's experimental rig, the test method includes the following steps:
Step a: enabling the driving portion apply driving force to the wheel portion by the control unit, to drive the wheel to revolve
Turn；
Step b: the driving portion is enabled to apply the load of simulated roadway frictional force to the wheel portion by the control unit；
Step c: the braking parts are operated by the brake operating platform and brake the wheel, the measuring device records the vehicle
Take turns torque and rotation speed change in braking process.
10. the test method of vehicle dynamic brake performance according to claim 9, which is characterized in that the vehicle manpower
Brake test device further include: nature imitation experiment device, the nature imitation experiment device are connected with the control unit, the test method
Further include:
Step d: emulation platform is established by the nature imitation experiment device, the frictional force of road conditions where setting vehicle；
Step e: the test of vehicle braking process simulation is carried out according to the nature imitation experiment device, obtains the wheel in the vehicle
The load parameter given in braking process l-G simulation test by road；
Step f: the load parameter is transferred to the driving portion by the nature imitation experiment device, so that the driving portion obtains institute
State the load of simulated roadway frictional force.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201811632503.5A CN109738200A (en) | 2018-12-29 | 2018-12-29 | The test method of vehicle manual braking experimental rig and vehicle dynamic brake performance |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811632503.5A CN109738200A (en) | 2018-12-29 | 2018-12-29 | The test method of vehicle manual braking experimental rig and vehicle dynamic brake performance |
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| CN109738200A true CN109738200A (en) | 2019-05-10 |
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| CN201811632503.5A Pending CN109738200A (en) | 2018-12-29 | 2018-12-29 | The test method of vehicle manual braking experimental rig and vehicle dynamic brake performance |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111780986A (en) * | 2020-06-19 | 2020-10-16 | 东风汽车集团有限公司 | Dynamic braking retarding torque testing system and method based on whole vehicle working condition |
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| JPH01137901A (en) * | 1987-07-10 | 1989-05-30 | Iseki & Co Ltd | Tilling and working machine |
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