CN110095275A - The table apparatus and brake oil weight testing method of analogue measurement brake-pedal travel - Google Patents
The table apparatus and brake oil weight testing method of analogue measurement brake-pedal travel Download PDFInfo
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- CN110095275A CN110095275A CN201910472712.6A CN201910472712A CN110095275A CN 110095275 A CN110095275 A CN 110095275A CN 201910472712 A CN201910472712 A CN 201910472712A CN 110095275 A CN110095275 A CN 110095275A
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- brake
- oil
- pedal travel
- table apparatus
- analogue measurement
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
Abstract
The present invention relates to automotive testing equipment technical field more particularly to the table apparatus and brake oil weight testing method of a kind of analogue measurement brake-pedal travel；Described device includes the fueller for passing through pressure oil pipeline connection with brake caliper assembly to be measured, and the pressure oil pipeline includes solenoid directional control valve and the braking fuel feed pump for being respectively communicated with the solenoid directional control valve, oil liquid collecting pipe and braking petroleum pipeline；Oil-supplying switch valve is set on the braking fuel feed pump, and switch valve is collected in setting on the oil liquid collecting pipe.The table apparatus and brake oil weight testing method of analogue measurement brake-pedal travel disclosed in this invention, compared with traditional test method, experimental data test process of the present invention is executed in laboratory completely, it is limited closer to vehicle but by vehicle assembly time, it is not limited by outside environmental elements, effectively shorten test period, the timeliness for measuring the data obtained is higher, while reducing costs than traditional test method.
Description
Technical field
The present invention relates to automotive testing equipment technical field more particularly to a kind of tests of analogue measurement brake-pedal travel
Platform device and brake oil weight testing method.
Background technique
With the rapid development of auto industry, more and more consumers begins to focus on automobile operation feeling, wherein especially
Pay close attention to the size of stepping on stroke of the automobile in brake process；In consideration of it, more and more car manufacturers take up to pass through
Relevant device is acquired and analyzes to the stroke of vehicle brake pedal, and steps on this basis reasonably to adjust automobile brake
The stroke curve of plate makes the safety of automobile and comfort be protected.
Hyundai Motor industry competition is growing more intense, this just promote each car manufacturer to seek the period is shorter, and cost is lower
Method realize the handling instruction of vehicle.However, collection analysis system of the tradition to automobile brake pedal impulse stroke curve
Most of system is to clamp rack using independent brake to complete, and measurement the data obtained is larger relative to vehicle difference, so sometimes
Not only theoretical foundation cannot be provided for design, may misled instead to design.
Chinese patent 2018108654242 provides a kind of for simulating the work of whole vehicle state measurement braking system performance
Dress；Including testing stand, it is respectively equipped with a brake caliper for installing brake caliper assembly on the quadrangle of the testing stand and pacifies
Slide unit is filled, the brake caliper installation slide unit is slidably connected with the slideway on the testing stand, and solid by lockable mechanism locking
It is fixed；The middle part of the testing stand in the longitudinal direction is symmetrically installed with forerunner's power assembly and rear-guard power assembly；The test
The middle part lower end of platform in the direction of the width is equipped with the brake for installing brake assembly and controls slide unit, brake control slide unit and
The slideway of the testing stand is slidably connected, and is fixed by lockable mechanism locking.Disclosed measures for simulating whole vehicle state
The tooling of braking system performance is simulated by brake caliper assembly and is braked, for acquiring the parameter under braking moment, can satisfy
The braking performance test of various.Above-mentioned patent provides the test device of brake force and braking distance, but is the absence of correspondence
About braking oil mass test device and method.
Therefore, to solve the above-mentioned problems, it is badly in need of inventing a kind of testing stand dress of new analogue measurement brake-pedal travel
It sets and brake oil weight testing method.
Summary of the invention
It is an object of the invention to: the table apparatus and brake oil for providing a kind of analogue measurement brake-pedal travel measure
Method for testing is built in laboratory in the form of rack, is completed by angular transducer, solenoid directional control valve and graduated cylinder, system
Ground records and analyzes, so that the instruction for brake-pedal travel provides theoretical foundation.
The present invention provides following proposals:
A kind of table apparatus of analogue measurement brake-pedal travel, including pass through pressure oil with brake caliper assembly to be measured
The fueller of pipeline connection, the pressure oil pipeline include solenoid directional control valve and the braking for being respectively communicated with the solenoid directional control valve
Fuel feed pump, oil liquid collecting pipe and braking petroleum pipeline；Wherein, the brake fuel feed pump is connected to brake caliper assembly to be measured, is used for
Conveying braking oil liquid；Setting is used for the metering device of access brake oil below the oil outlet of the oil liquid collecting pipe；The braking
Petroleum pipeline is connected to the fueller；Oil-supplying switch valve is set on the braking fuel feed pump, is arranged on the oil liquid collecting pipe and receives
Collect switch valve.
Preferably, the table apparatus of the analogue measurement brake-pedal travel further includes testing stand, the testing stand
It is equipped with support frame, the solenoid directional control valve is fixedly connected with the end of support frame as described above；The metering device is graduated cylinder, described
Graduated cylinder is fixedly connected with the pedestal of support frame as described above.
Preferably, the graduated cylinder is equipped with electronic liquid level gauge, and the electronic liquid level gauge is electrically connected with central controller.
Preferably, a brake caliper for installing brake caliper assembly is respectively equipped on the quadrangle of the testing stand to pacify
Slide unit is filled, the brake caliper installation slide unit is slidably connected with the slideway on the testing stand, and solid by lockable mechanism locking
It is fixed；Forerunner's power assembly and rear-guard power assembly are installed in the testing stand both ends respectively, forerunner's power assembly and it is described after
Position is correspondingly arranged between two brake caliper installation slide units driving force assembly respectively；Use is additionally provided on the testing stand
Slide unit is controlled in the brake of installation brake assembly, the slideway of brake the control slide unit and the testing stand is slidably connected, and leads to
Lockable mechanism locking is crossed to fix；
The brake control slide unit is equipped with the brake servoBcylinder for simulating brake control power, the brake servoBcylinder
One end is fixed with brake control slide unit, and the other end is used to be correspondingly arranged with the brake pedal position of brake assembly；The brake
The end face of the telescopic rod of vehicle servoBcylinder is equipped with the force snesor for detecting brake control power, and the force snesor and brake are total
At brake pedal position be correspondingly arranged；Displacement sensor is equipped on the brake servoBcylinder side by side, institute's displacement sensors
One end and the cylinder body of the brake servoBcylinder are fixed, and the end face of the other end and the telescopic rod of the brake servoBcylinder is fixed；
The fueller is installed in the middle part of the testing stand, the fueller is equipped with for blocking with the brake
Clamp the multiple pressure oil pipelines being correspondingly connected with.
Preferably, the torque being equipped on each brake caliper installation slide unit for detecting brake callipers braking torque passes
Sensor.
Preferably, the testing stand is equipped with angular transducer, and one end of the angular transducer and the testing stand connect
It connects, the other end with the brake pedal connecting rod of the brake assembly for connecting.
Preferably, vacuum pump is additionally provided on the testing stand, the vacuum pump is connect with the fueller.
Preferably, the vacuum pump is equipped with vacuum transducer.
Preferably, ABS device is additionally provided on the testing stand, the fueller and the ABS device pass through the pressure
The connection of power oil pipe line, the ABS device pass through the pressure oil pipeline respectively and connect with each brake caliper.
Further, the present invention also provides a kind of table apparatus based on the analogue measurement brake-pedal travel
Analogue measurement vehicle brake-pedal travel brake oil weight testing method, include the following steps:
Apply brake force, feed brake oil；
Keep brake force constant；
Oil-supplying switch valve is closed, opens and collects switch valve；
Metering braking oil mass.
It is that the present invention generates the utility model has the advantages that
The table apparatus and brake oil weight testing method of analogue measurement brake-pedal travel disclosed in this invention, including
With brake caliper assembly to be measured by the fueller of pressure oil pipeline connection, the pressure oil pipeline include solenoid directional control valve and
It is respectively communicated with the braking fuel feed pump, oil liquid collecting pipe and braking petroleum pipeline of the solenoid directional control valve；Wherein, the brake fuel feed pump
It is connected to brake caliper assembly to be measured, for conveying braking oil liquid；It is arranged below the oil outlet of the oil liquid collecting pipe for containing
Connect the metering device of brake oil；The braking petroleum pipeline is connected to the fueller；Fuel feeding is arranged on the braking fuel feed pump to open
Valve is closed, switch valve is collected in setting on the oil liquid collecting pipe；By angle and being waited on testing stand to the power of brake pedal, rotation
The collection analysis of the liquid measure data of pressure drop lower whorl side output, determines its relation curve, and by with theoretical calculation and initial stage system
Fixed performance objective compares, and can primarily determine whether brake pedal sense meets design requirement, and on this basis, by right
The adjustment of system relevant parameter, makes pedal force reach perfect condition.Compared with traditional test method, experiment of the present invention
Data test process is executed in laboratory completely, is limited closer to vehicle but by vehicle assembly time, not by external environment
The limitation of factor, effectively shortens test period, and the timeliness for measuring the data obtained is higher, while dropping than traditional test method
Low cost.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the table apparatus of analogue measurement brake-pedal travel of the invention.
Fig. 2 is the structural schematic diagram of the table apparatus of analogue measurement brake-pedal travel of the invention.
Specific embodiment
Technical solution of the present invention is clearly and completely described below in conjunction with attached drawing, it is clear that described implementation
Example is a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ordinary skill
Personnel's every other embodiment obtained without making creative work, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that term " center ", "upper", "lower", "left", "right", "vertical",
The orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" be based on the orientation or positional relationship shown in the drawings, merely to
Convenient for description the present invention and simplify description, rather than the device or element of indication or suggestion meaning must have a particular orientation,
It is constructed and operated in a specific orientation, therefore is not considered as limiting the invention.In addition, term " first ", " second ",
" third " is used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance.
In the description of the present invention, it should be noted that unless otherwise clearly defined and limited, term " installation ", " phase
Even ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can
To be mechanical connection, it is also possible to be electrically connected；It can be directly connected, can also can be indirectly connected through an intermediary
Connection inside two elements.For the ordinary skill in the art, above-mentioned term can be understood at this with concrete condition
Concrete meaning in invention.
It is shown in Figure 1, a kind of table apparatus of analogue measurement brake-pedal travel, including it is total with brake caliper to be measured
The fueller 8 being connected at 17 by pressure oil pipeline 9, the pressure oil pipeline include solenoid directional control valve 19 and are respectively communicated with institute
State the braking fuel feed pump 20, oil liquid collecting pipe 21 and braking petroleum pipeline 22 of solenoid directional control valve；Wherein, the brake fuel feed pump with to
The connection of brake caliper assembly is surveyed, for conveying braking oil liquid；Setting is used for access system below the oil outlet of the oil liquid collecting pipe
Move the metering device 23 of oil；The braking petroleum pipeline is connected to the fueller；Oil-supplying switch is set on the braking fuel feed pump
Valve 24, switch valve 25 is collected in setting on the oil liquid collecting pipe.The table apparatus of the analogue measurement brake-pedal travel
It further include testing stand 1, the testing stand is equipped with support frame 26, the fixed company in the end of the solenoid directional control valve and support frame as described above
It connects；The metering device is graduated cylinder, and the graduated cylinder is fixedly connected with the pedestal of support frame as described above.The graduated cylinder is equipped with electronics liquid
Position meter, the electronic liquid level gauge are electrically connected with central controller.For the specific structure of electronic liquid level gauge and central controller, figure
In do not indicate, be well-known technique, be not repeated herein.
It is shown in Figure 2, including testing stand 1, one is respectively equipped on the quadrangle of the testing stand for installing braking clamp
The brake caliper for clamping assembly 2 installs slide unit 3, and the brake caliper installation slide unit is slidably connected with the slideway on the testing stand,
And it is fixed by lockable mechanism locking；The middle part of the testing stand in the longitudinal direction is symmetrically installed with 4 He of forerunner's power assembly
Position is correspondingly arranged in two systems respectively for rear-guard power assembly 5, forerunner's power assembly and the rear-guard power assembly
Moving calipers are installed between slide unit；The middle part lower end of the testing stand in the direction of the width is equipped with the brake for installing brake assembly
Slide unit 6 is controlled, the slideway of brake the control slide unit and the testing stand is slidably connected, and fixes by lockable mechanism locking；
The brake control slide unit is equipped with brake servoBcylinder 7 for simulating brake control power, one end of the brake servoBcylinder with
The brake control slide unit is fixed, and the other end is used to be correspondingly arranged with the brake pedal position of brake assembly.The testing stand
Middle part is installed with the fueller 8, and the fueller is equipped with multiple institutes for being correspondingly connected with the brake callipers
State pressure oil pipeline 9.The torque for detecting 17 braking torque of brake callipers is equipped on each brake caliper installation slide unit
Sensor 10.Each pressure oil pipe road is provided with flow sensor 11 and pressure sensor 12.The brake servoBcylinder
The end face of telescopic rod be equipped with force snesor 13 for detecting brake control power, the force snesor and brake assembly 16
Brake pedal position is correspondingly arranged；On the brake servoBcylinder side by side be equipped with displacement sensor 14, the one of institute's displacement sensors
It holds and is fixed with the cylinder body of the brake servoBcylinder, the end face of the other end and the telescopic rod of the brake servoBcylinder is fixed.The examination
Platform is tested equipped with angular transducer 15, one end of the angular transducer is connect with the testing stand, the other end for it is described
The brake pedal connecting rod of brake assembly connects.Vacuum pump, the vacuum pump and the brake oil pump are additionally provided on the testing stand
Connection.The vacuum pump is equipped with vacuum transducer.Each pressure oil pipe road is additionally provided with electromagnetic throttle valve.The testing stand
On be additionally provided with ABS device 18, the brake oil pump and the ABS device pass through pressure oil piping connection, the ABS device difference
It is connect by a pressure oil pipeline with each brake caliper.
The present embodiment additionally provides a kind of simulation of table apparatus based on the analogue measurement brake-pedal travel
The brake oil weight testing method for measuring vehicle brake-pedal travel includes the following steps: to apply brake force, feed brake oil；
Keep brake force constant；Oil-supplying switch valve is closed, opens and collects switch valve；Metering braking oil mass.
The table apparatus and brake oil weight testing method of analogue measurement brake-pedal travel described in the present embodiment, including
With brake caliper assembly to be measured by the fueller of pressure oil pipeline connection, the pressure oil pipeline include solenoid directional control valve and
It is respectively communicated with the braking fuel feed pump, oil liquid collecting pipe and braking petroleum pipeline of the solenoid directional control valve；Wherein, the brake fuel feed pump
It is connected to brake caliper assembly to be measured, for conveying braking oil liquid；It is arranged below the oil outlet of the oil liquid collecting pipe for containing
Connect the metering device of brake oil；The braking petroleum pipeline is connected to the fueller；Fuel feeding is arranged on the braking fuel feed pump to open
Valve is closed, switch valve is collected in setting on the oil liquid collecting pipe；By angle and being waited on testing stand to the power of brake pedal, rotation
The collection analysis of the liquid measure data of pressure drop lower whorl side output, determines its relation curve, and by with theoretical calculation and initial stage system
Fixed performance objective compares, and can primarily determine whether brake pedal sense meets design requirement, and on this basis, by right
The adjustment of system relevant parameter, makes pedal force reach perfect condition.Compared with traditional test method, experiment of the present invention
Data test process is executed in laboratory completely, is limited closer to vehicle but by vehicle assembly time, not by external environment
The limitation of factor, effectively shortens test period, and the timeliness for measuring the data obtained is higher, while dropping than traditional test method
Low cost.
The table apparatus of analogue measurement brake-pedal travel described in the present embodiment, by all element packets of braking system
Include brake pedal, the total pump assembly of vacuum booster band brake, brake hard tube, air-brake coupling hose, ESC module (central controller), system
Dynamic device assembly, is arranged by rack attachment device to simulate vehicle, installs pedal force additional in brake pedal power input point
Sensor and pedal angular sensor, and install throttle valve, liquid measure outflux and graduated cylinder additional at wheel side, the pedal rotation
Angle of revolution sensor is fixedly connected on braking and steps in swing arm.
The table apparatus of analogue measurement brake-pedal travel described in the present embodiment has built a kind of completely new test
Platform, and install related sensor additional according to demand, thus the device of liquid measure needed for realizing areal survey to system, thus with a kind of low
Cost, short-period methods simulation vehicle are tested braking system pedal travel and relevant parameter, collected and are analyzed,
For braking system early period more system instruction theoretical foundation is provided.The testing stand has installed pedal additional relative to vehicle braking system
Force snesor, pedal travel sensor, control valve (including oil-supplying switch valve and collection switch valve) and measuring cup, cheap,
Performance is brilliant, test data can refer to value height, has very big contribution for looking after and guiding and improving braking performance of vehicle.
The course of work of the table apparatus of analogue measurement brake-pedal travel described in the present embodiment are as follows: according to different
Rim brake assembly designs different pinboard fixing tools, is installed to rim brake assembly in drive shaft, pedal arm
Bar setting angle sensor measurement pedal rotation angle is patched with vacuum booster；The pedal force of pedal force sensor acquisition simultaneously becomes
Change curve, and then come determine vehicle pedal travel corresponding pedal force curve and design object accordance.The fuel feeding is opened
Wheel side can be closed by closing valve, and after making wheel side reach certain pressure due to operation, close the oil-supplying switch valve, and described in opening
Switch valve is collected, relevant pressure is measured by graduated cylinder and falls the liquid measure of discharge, to pass through calculating, it is known that wheel more than side is consumed
Discharge capacity and required pedal travel, to achieve the purpose that piecewise analysis system needs liquid measure.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of table apparatus of analogue measurement brake-pedal travel, it is characterised in that: including with brake caliper assembly to be measured
By the fueller of pressure oil pipeline connection, the pressure oil pipeline includes solenoid directional control valve and is respectively communicated with the electromagnetism and changes
To the braking fuel feed pump of valve, oil liquid collecting pipe and braking petroleum pipeline；Wherein, the brake fuel feed pump and brake caliper assembly to be measured
Connection, for conveying braking oil liquid；Setting is used for the metering device of access brake oil below the oil outlet of the oil liquid collecting pipe；
The braking petroleum pipeline is connected to the fueller；Oil-supplying switch valve, the oil liquid collecting pipe are set on the braking fuel feed pump
Switch valve is collected in upper setting.
2. the table apparatus of analogue measurement brake-pedal travel according to claim 1, it is characterised in that: further include examination
Platform is tested, the testing stand is equipped with support frame, and the solenoid directional control valve is fixedly connected with the end of support frame as described above；The metering
Device is graduated cylinder, and the graduated cylinder is fixedly connected with the pedestal of support frame as described above.
3. the table apparatus of analogue measurement brake-pedal travel according to claim 2, it is characterised in that: the graduated cylinder
It is equipped with electronic liquid level gauge, the electronic liquid level gauge is electrically connected with central controller.
4. the table apparatus of analogue measurement brake-pedal travel according to claim 3, it is characterised in that: the test
It is respectively equipped with a brake caliper for installing brake caliper assembly on the quadrangle of platform, slide unit, the brake caliper installation are installed
Slide unit is slidably connected with the slideway on the testing stand, and is fixed by lockable mechanism locking；Pacify respectively at the testing stand both ends
Forerunner's power assembly and rear-guard power assembly are filled, position correspondence is set respectively for forerunner's power assembly and the rear-guard power assembly
It is placed between two brake caliper installation slide units；The brake control for installing brake assembly is additionally provided on the testing stand
The slideway of slide unit, brake the control slide unit and the testing stand is slidably connected, and is fixed by lockable mechanism locking；
The brake control slide unit is equipped with the brake servoBcylinder for simulating brake control power, one end of the brake servoBcylinder
It is fixed with brake control slide unit, the other end is used to be correspondingly arranged with the brake pedal position of brake assembly；The brake is watched
The end face for taking the telescopic rod of cylinder is equipped with force snesor for detecting brake control power, the force snesor and brake assembly
Brake pedal position is correspondingly arranged；Displacement sensor, one end of institute's displacement sensors are equipped on the brake servoBcylinder side by side
It is fixed with the cylinder body of the brake servoBcylinder, the end face of the other end and the telescopic rod of the brake servoBcylinder is fixed；
Be installed with the fueller in the middle part of the testing stand, the fueller be equipped with for the brake callipers pair
The multiple pressure oil pipelines that should be connected.
5. the table apparatus of analogue measurement brake-pedal travel according to claim 4, it is characterised in that: each system
The torque sensor for detecting brake callipers braking torque is equipped on moving calipers installation slide unit.
6. the table apparatus of analogue measurement brake-pedal travel according to claim 5, it is characterised in that: the test
Platform is equipped with angular transducer, and one end of the angular transducer is connect with the testing stand, and the other end is used for and the brake
The brake pedal connecting rod of assembly connects.
7. the table apparatus of analogue measurement brake-pedal travel according to claim 6, it is characterised in that: the test
Vacuum pump is additionally provided on platform, the vacuum pump is connect with the fueller.
8. the table apparatus of analogue measurement brake-pedal travel according to claim 7, it is characterised in that: the vacuum
Pump is equipped with vacuum transducer.
9. the table apparatus of analogue measurement brake-pedal travel according to claim 8, it is characterised in that: the test
ABS device is additionally provided on platform, the fueller and the ABS device pass through the pressure oil piping connection, the ABS device
It is connect respectively by a pressure oil pipeline with each brake caliper.
10. a kind of analogue measurement of the table apparatus based on analogue measurement brake-pedal travel as described in claim 1 is whole
The brake oil weight testing method of vehicle brake-pedal travel, it is characterised in that: include the following steps:
Apply brake force, feed brake oil；
Keep brake force constant；
Oil-supplying switch valve is closed, opens and collects switch valve；
Metering braking oil mass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910472712.6A CN110095275A (en) | 2019-05-31 | 2019-05-31 | The table apparatus and brake oil weight testing method of analogue measurement brake-pedal travel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910472712.6A CN110095275A (en) | 2019-05-31 | 2019-05-31 | The table apparatus and brake oil weight testing method of analogue measurement brake-pedal travel |
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| Publication Number | Publication Date |
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| CN110095275A true CN110095275A (en) | 2019-08-06 |
Family
ID=67449943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910472712.6A Pending CN110095275A (en) | 2019-05-31 | 2019-05-31 | The table apparatus and brake oil weight testing method of analogue measurement brake-pedal travel |
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| CN (1) | CN110095275A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111142505A (en) * | 2019-12-30 | 2020-05-12 | 威伯科汽车控制系统（中国）有限公司 | Brake signal transmitter function test device |
| WO2021258702A1 (en) * | 2020-06-24 | 2021-12-30 | 中国第一汽车股份有限公司 | Method for testing amount of fluid required for automobile brake |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111142505A (en) * | 2019-12-30 | 2020-05-12 | 威伯科汽车控制系统（中国）有限公司 | Brake signal transmitter function test device |
| CN111142505B (en) * | 2019-12-30 | 2022-01-18 | 采埃孚商用车系统(青岛)有限公司 | Brake signal transmitter function test device |
| WO2021258702A1 (en) * | 2020-06-24 | 2021-12-30 | 中国第一汽车股份有限公司 | Method for testing amount of fluid required for automobile brake |
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Application publication date: 20190806 |