CN105547713A - Brake fluid required amount testing device of automobile braking system and application thereof - Google Patents
Brake fluid required amount testing device of automobile braking system and application thereof Download PDFInfo
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- CN105547713A CN105547713A CN201610054781.1A CN201610054781A CN105547713A CN 105547713 A CN105547713 A CN 105547713A CN 201610054781 A CN201610054781 A CN 201610054781A CN 105547713 A CN105547713 A CN 105547713A
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- brake
- liquid measure
- proving installation
- brake fluid
- wheel cylinder
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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
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The present invention discloses a brake fluid required amount testing device of an automobile braking system and an application thereof. The testing device comprises a cavity circular pipe, a linear displacement sensor, an I-shaped piston and a metal bar. Two ends of the cavity circular pipe are respectively threadingly connected with interfaces of a brake hard tube and a brake hose; an I-shaped piston is arranged in the cavity circular pipe; the I-shaped piston is in transition fit for the cavity circular pipe; the metal bar is vertically arranged on the connection rod of the I-shaped piston; the linear displacement sensor is arranged at the top of the metal bar, and the sliding block of the linear displacement sensor is fixed with the top end of the metal bar; and the linear displacement sensor is fixedly connected with the inner wall of the cavity circular pipe. The brake fluid required amount testing device of an automobile braking system and an application thereof are simple in principle, high in operability and high in accuracy, and is applicable to accurate testing of the small-flow and large-voltage brake fluid required amount.
Description
Technical field
The present invention relates to Automobile Measuring Techniques field, the brake fluid being specifically related to a kind of brake system of car needs liquid measure proving installation and application thereof.
Background technology
The good brake system of automobile is an important leverage of traffic safety, when there is accident in the process of moving in automobile, stable and rapidly braking energy reduce security threat suffered by driver and the outer other staff of car significantly.
Brake system structure pattern mainly contains mechanical type, pneumatic type, fluid pressure type, gas-liquid mixed.Their principle of work is substantially all the same, is all utilize clamping device, consumes the kinetic energy that vehicle has gradually, slow down, until the object of stopping to reach car brakeing by the heat of friction produced during work.
Hydraulic braking system for automobile uses the most widely, its structure is very simple, be made up of master cylinder and wheel cylinder, the pressure of master cylinder divides to (wheel cylinder is on four wheel drags) on four wheel cylinders by pipeline, the pressure that tramps with one's feet brake pedal, brake pedal force on the piston of master cylinder, is exactly that brake fluid passes to four wheel cylinders by pipeline to master cylinder pressurization by lever transmission.Wheel cylinder is actually hydraulic actuating mechanism, is generally made up of oil cylinder, piston etc.Master cylinder pressure forces two pistons outwards to promote after passing and coming, and makes shoe brake push against brake drum or clamping brake disc, makes wheel decelerates, thus play the effect of Brake stop by friction.
Need liquid measure to test to brake piping brake fluid and there is vital role, as pressure-liquid volume characteristic to optimization automotive brake systems design.Hydraulic braking system for automobile is not when braking, and in pipeline, brake fluid does not flow, but in braking procedure, brake fluid flow is little, and line pressure is large, and during the electronic control system active boost braking of particularly equipping, line pressure can reach 25MPa.Now in order to liquid flow measurement mainly based on flow sensor, to be mainly applicable to continuously, the measurement of low pressure flow.Flow sensor be difficult to realize brake system of car need liquid measure small-range (usually within 10ml), high pressure (more than 25MPa) environment under measurement.
During hydraulic braking system for automobile work, the brake fluid flowed out by master cylinder is different from the brake fluid volume entering wheel cylinder, and the brake fluid only entering wheel cylinder directly could produce damping force.Manpower tramples brake pedal, can act on the brake fluid in master cylinder, makes it flow out.As can be seen here, test can directly actuatedly be the discharge of the brake fluid in master cylinder, indirectly can only control the brake fluid influx of wheel cylinder, thus in order to control the size of damping force, the relation of both research is indispensable.
Summary of the invention
The present invention is for overcoming the deficiencies in the prior art part, the brake fluid providing the brake system of car that a kind of principle is simple, workable, degree of accuracy is high needs liquid measure proving installation and application thereof, to can accurately measured automobiles hydraulic braking time need liquid measure, thus the fit correlation of the brake fluid flowed out from master cylinder and the brake fluid entering wheel cylinder can be studied, and determined the best stroke of brake pedal by test.
The present invention is adopted following technical scheme by technical solution problem:
The brake fluid of a kind of brake system of car of the present invention needs liquid measure proving installation, and described brake system of car comprises: brake oil liquid bath, master cylinder, brake pedal, brake hard tube, air-brake coupling hose, wheel cylinder and detent; Described brake pedal is connected with master cylinder; Described brake oil liquid bath is connected with master cylinder by pipeline, and described master cylinder is connected with four wheel cylinders with air-brake coupling hose by described brake hard tube; Described wheel cylinder is connected with detent; Be characterized in,
The interface of described air-brake coupling hose and wheel cylinder is provided with first and needs liquid measure proving installation;
Described first needs liquid measure proving installation to comprise: cavity pipe, linear displacement transducer, Metallic rod and I shape piston;
Described cavity pipe is connected with the interface thread of wheel cylinder with described air-brake coupling hose respectively;
Described I shape piston is provided with in described cavity pipe; Described I shape piston and described cavity pipe transition fit; The connecting link of described I shape piston is vertically installed with described Metallic rod; The top of described Metallic rod is provided with described linear displacement transducer; Described linear displacement transducer is fixedly connected with described cavity round tube inner wall;
Described first needs liquid measure proving installation to be that the brake fluid utilizing described brake pedal to promote described master cylinder flows in described cavity pipe through described brake hard tube, thus promote described I shape piston movement, brake fluid in described air-brake coupling hose is pressed in described wheel cylinder, and makes described Metallic rod that the slide block on described linear displacement transducer can be driven on described linear displacement transducer to produce displacement; Thus obtain first of described wheel cylinder and need liquid measure.
Brake fluid of the present invention needs the feature of liquid measure proving installation to be also,
Described first needs liquid measure V to utilize formula (1) to calculate to obtain:
V＝S×L(1)
In formula (1), S represents the cross-sectional area of described I shape piston; L represents the displacement of described linear displacement transducer.
The brake fluid of a kind of brake system of car of the present invention needs the feature of the application of liquid measure proving installation to be between described brake hard tube and described air-brake coupling hose, arrange second again need liquid measure proving installation;
To described first need liquid measure proving installation to obtain first need liquid measure and second to need liquid measure proving installation to obtain second need liquid measure to compare, thus obtain fit correlation.
The brake fluid of a kind of brake system of car of the present invention needs the feature of liquid measure proving installation to be also,
According to the stroke of described brake pedal difference test described first need liquid measure proving installation to produce first need liquid measure; Thus determine the best stroke of described brake pedal; Optimal brake power is produced with described best stroke.
The brake hard tube needing liquid measure proving installation place arranges a pressure transducer, by the P-V characteristic test device needing liquid measure proving installation and pressure transducer to form wheel cylinder;
The pressure of the need liquid measure proving installation to obtain by described first first brake hard tube needing liquid measure and pressure transducer to obtain, thus obtain the P-V characteristic of described wheel cylinder.
Compared with prior art, beneficial effect of the present invention is embodied in:
1, the present invention is applicable to hydraulic braking system for automobile performance test; By using cubature formula V=S × L, volume size can be calculated quickly and easily, avoiding the inconvenience of directly measuring brake fluid flow; And during hydraulic braking system for automobile work, brake-pipe pressure is large and brake fluid flow flow velocity is little, directly measure and be difficult to realize, and precision is low.
2, the present invention adopts linear displacement transducer output displacement information representation brake fluid flow, improves the degree of accuracy of measurement result.The function of linear displacement transducer is that a straight line mechanical displacement converts electric signal to.Linear displacement transducer practice is a slide rheostat, is integrated with an information processing chip inside it, the variable quantity of slide rheostat both end voltage is converted into displacement.Electric signal is highly sensitive, and the displacement degree of accuracy measured is high.
3, structure of the present invention is simple, is easy to fabrication and installation.Linear displacement transducer inside is integrated with circuit, easy to use; Linear displacement transducer volume is little, easily installs.
4, the present invention can in order to research from the relation between the brake fluid volume and the brake fluid volume finally entering wheel cylinder of master cylinder outflow.Install one in the junction of brake hard tube and air-brake coupling hose and need liquid measure proving installation, between air-brake coupling hose and wheel cylinder, arrange one again need liquid measure proving installation, measure respectively two need liquid measure proving installation need liquid measure, carry out many experiments, find out fit correlation between the two.
5, the present invention can obtain the best stroke of brake pedal by test; By the different strokes of brake pedal, obtain it and need liquid measure, along with the stroke of brake pedal constantly increases, it needs liquid measure also to become large thereupon, after arriving a critical point, even if increase the stroke of brake pedal, it needs liquid measure to remain unchanged, and needs liquid measure relation to determine the best stroke of brake pedal processed by brake-pedal travel and braking.
6, the present invention can test in order to the P-V characteristic test of wheel cylinder, finds out the brake fluid volume of wheel cylinder and the fit correlation of pressure of wheel cylinder, can provide guidance for the design of pressure adjustment assembly and improvement.Brake hard tube arranges a pressure transducer, because hydraulic pressure is identical with hydraulic pressure in connected wheel cylinder in brake hard tube, wheel cylinder pressure can be obtained.Need liquid measure proving installation to be arranged between air-brake coupling hose and wheel cylinder, measure the brake fluid flow entering wheel cylinder.Thus, the P-V characteristic test test of wheel cylinder can be carried out, via test of many times, find out the brake fluid volume of wheel cylinder and the fit correlation of pressure of wheel cylinder.As theoretical foundation, carry out fine adjustment pressure of wheel cylinder by the brake fluid volume controlling to enter wheel cylinder, to reach optimum braking effect, in order to design and improvement pressure adjustment assembly.
Accompanying drawing explanation
Fig. 1 is a kind of structural representation that brake system of car of the present invention is housed;
Fig. 2 is that the brake fluid of a kind of brake system of car of the present invention needs liquid measure proving installation structural representation;
Fig. 3 is the application schematic diagram that the brake fluid of a kind of brake system of car of the present invention needs liquid measure proving installation;
Fig. 4 is the second application schematic diagram that the brake fluid of a kind of brake system of car of the present invention needs liquid measure proving installation;
Number in the figure: 1 brake oil liquid bath; 2 master cylinders; 3 brake pedals; 4a brake hard tube; 4b air-brake coupling hose; 5 first need liquid measure proving installation; 5a cavity pipe; 5b linear displacement transducer; 5c Metallic rod; 5d I shape piston; 6 wheel cylinders; 7 detents; 8 second need liquid measure proving installation; 9 pressure transducers.
Embodiment
Embodiment 1: as shown in Figure 1, a kind of brake fluid of brake system of car needs the hydraulic braking system for automobile in liquid measure proving installation to comprise: brake oil liquid bath 1, master cylinder 2, brake pedal 1, brake hard tube 4a, air-brake coupling hose 4b, wheel cylinder 6 and detent 7; Described brake pedal 3 is connected with master cylinder 2; Described brake oil liquid bath 1 is connected with master cylinder 2 by pipeline, and master cylinder 2 is connected with four wheel cylinders 6 with air-brake coupling hose 4b by described brake hard tube 4a; Described wheel cylinder 6 is connected with detent 7.
The interface of air-brake coupling hose 4b and wheel cylinder 6 is provided with first and needs liquid measure proving installation 5;
As shown in Figure 2, first liquid measure proving installation 5 is needed to comprise: cavity pipe 5a, linear displacement transducer 5b, Metallic rod 5c and I shape piston 5d.
Cavity pipe 5a is connected with the interface thread of wheel cylinder 6 with air-brake coupling hose 4b respectively, and two bottom surfaces of cavity pipe 5a are respectively arranged with inlet and liquid outlet, and brake fluid enters from inlet, and liquid outlet flows out.
I shape piston 5d is provided with, I shape piston 5d and cavity pipe 5a transition fit in cavity pipe 5a.I shape piston 5d is the hydraulic piston that one or two piston area is fixed together by a metal tie rods, I shape piston 5d has two O-ring seals, is enclosed within respectively on two piston areas.O-ring seal has certain elasticity, both can play sealing function, prevents the space between liquid inflow I shape piston 5d two piston areas, also on hydraulic action, can promote that I shape piston 5d moves.
The connecting link of I shape piston 5d is vertically installed with Metallic rod 5c, the top of Metallic rod 5c is provided with linear displacement transducer 5c; Specifically, the slide block of linear displacement transducer 5b and the top of Metallic rod 5c are fixed, and move electric signal in change circuit, thus obtain displacement by slide block at linear displacement transducer 5b.
Linear displacement transducer 5b, concrete employing KTF linear displacement transducer.It measures length is 75-3000mm, and all there is 4mm cushion stroke at two ends, linear precision 0.05% ~ 0.04%FS, maximum translational speed 10m/s, between normal working temperature 60 DEG C-150 DEG C.
Linear displacement transducer 5b is fixedly connected with cavity pipe 5a inwall.
Before on-test, the space in cavity pipe 5a except the space between I shape piston 5d two-piston face is made to be full of brake fluid.When needing liquid measure proving installation to work, manpower pedal brake pedal 3, provides power, promotes the brake fluid trickling of master cylinder 2; First through brake hard tube 4a, flow through air-brake coupling hose 4b subsequently, inlet followed by cavity pipe 5a flows in cavity pipe 5a, thus hydraulic pressure is produced on the piston area of I shape piston 5d, promote I shape piston 5d motion, and then drive the Metallic rod 5c be welded on I shape piston 5d connecting link to move.Because the slide block of linear displacement transducer 5b and the top of Metallic rod 5c are fixed together, drive the slide block of linear displacement transducer 5b to produce displacement on linear displacement transducer 5b, thus first of acquisition wheel cylinder 6 need liquid measure.
Liquid measure V is wherein needed to utilize formula (1) to calculate to obtain:
V＝S×L(1)
In formula (1), S represents the cross-sectional area of I shape piston 5d; L represents the displacement of linear displacement transducer 5b.
The liquid outlet of brake fluid in cavity pipe 5a by cavity pipe 5a is flowed in wheel cylinder 6 simultaneously.Form power by hydraulic pressure, impel detent 7 to work, utilize the rubbing action between object, reach the object of Brake stop.
Embodiment 2: as shown in Figure 3, a kind of brake system of car brake fluid needs the application of liquid measure proving installation, arranges second again and need liquid measure proving installation 8 between brake hard tube 4a and air-brake coupling hose 4b;
Tested by the workflow of embodiment 1, obtaining first needs first of liquid measure proving installation to need liquid measure and second to need second of liquid measure proving installation to need liquid measure.
To first need liquid measure proving installation to obtain first need liquid measure and second to need liquid measure proving installation to obtain second need liquid measure to compare, probe into the fit correlation between them.
Because air-brake coupling hose 4b is elastomeric material, there is certain retractility.When brake fluid flows through air-brake coupling hose 4b, the brake fluid of high temperature makes air-brake coupling hose 4b expand, air-brake coupling hose 4b radius increases, thus air-brake coupling hose 4b pipe internal volume increases, more brake fluid can be held, cause the brake fluid flowing into wheel cylinder 6 to reduce, carry out test of many times, carry out data analysis, find out fit correlation between the two.
Embodiment 3: as shown in Figure 4, the second brake system of car brake fluid needs the application of liquid measure proving installation, that a pressure transducer 9 is set on the brake hard tube 4a needing liquid measure proving installation place, by the P-V characteristic test device needing liquid measure proving installation 5 and pressure transducer 9 to form wheel cylinder 6.
Before on-test, the space in cavity pipe 5a except the space between I shape piston 5d two-piston face is made to be full of brake fluid.When needing liquid measure proving installation to work, manpower pedal brake pedal 3, provides power, promotes the brake fluid trickling of master cylinder 2.Brake fluid, first through brake hard tube 4a, flows through pressure transducer 9 subsequently, and now pressure transducer 9 obtains the pressure values P in brake hard tube 4a, and because pipeline is intercommunication, therefore the pressure in wheel cylinder 6 is also P.Then flow through air-brake coupling hose 4b and enter requirement proving installation 5.Brake fluid is flowed in cavity pipe 5a by the inlet of cavity pipe 5a, thus produces hydraulic pressure on the piston area of I shape piston 5d, promotes I shape piston 5d motion, and then drives the Metallic rod 5c be welded on I shape piston 5d connecting link to move.Because the slide block of linear displacement transducer 5b and the top of Metallic rod 5c are fixed together, drive the slide block of linear displacement transducer 5b to produce displacement on linear displacement transducer 5b, thus obtain wheel cylinder 6 need liquid measure;
The liquid outlet of brake fluid in cavity pipe 5a by cavity pipe 5a is flowed in wheel cylinder 6 simultaneously, by hydraulic pressure as power, impel detent 7 to work, utilize the rubbing action between object, reach the object of braking.By test of many times, obtain mass data, through analytical analysis, thus obtain the P-V characteristic of wheel cylinder.
Embodiment 4: the third brake system of car brake fluid needs the application of liquid measure proving installation, according to the stroke of brake pedal 3 difference test first need liquid measure proving installation to produce first need liquid measure; Test of many times is carried out by the workflow of embodiment, the ascending continuous increase of stroke of brake pedal 3, record first need liquid measure proving installation to produce first need liquid measure, by the time during a critical point, even if increase the stroke of brake pedal 3, first need liquid measure proving installation to produce first need liquid measure also can not change.The efficiency now acting on the power on brake pedal 3 is maximum, thus determines the best stroke of brake pedal 3; Optimal brake power is produced with best stroke.
It is only inventive embodiment above; but be not used for limiting itself, any those of ordinary skill in the art, the design, improvement etc. of being correlated with can be carried out according to its essential idea; when without prejudice to spirit of the present invention, all should drop in protection scope of the present invention.
Claims (5)
1. the brake fluid of brake system of car needs a liquid measure proving installation, and described brake system of car comprises: brake oil liquid bath (1), master cylinder (2), brake pedal (3), brake hard tube (4a), air-brake coupling hose (4b), wheel cylinder (6) and detent (7); Described brake pedal (3) is connected with master cylinder (2); Described brake oil liquid bath (1) is connected with master cylinder (2) by pipeline, and described master cylinder (2) is connected with four wheel cylinders (6) with air-brake coupling hose (4b) by described brake hard tube (4a); Described wheel cylinder (6) is connected with detent (7); It is characterized in that,
At described air-brake coupling hose (4b), the interface of wheel cylinder (6) is provided with first and needs liquid measure proving installation (5);
Described first needs liquid measure proving installation to comprise: cavity pipe (5a), linear displacement transducer (5b), Metallic rod (5c) and I shape piston (5d);
Described cavity pipe (5a) is connected with the interface thread of described air-brake coupling hose (4b) with wheel cylinder (6) respectively;
Described I shape piston (5d) is provided with in described cavity pipe (5a); Described I shape piston (5d) and described cavity pipe (5a) transition fit; The connecting link of described I shape piston (5d) is vertically installed with described Metallic rod (5c); The top of described Metallic rod (5c) is provided with described linear displacement transducer (5b); Described linear displacement transducer (5b) is fixedly connected with described cavity pipe (5a) inwall;
Described first needs liquid measure proving installation to be that the brake fluid utilizing described brake pedal (3) to promote described master cylinder (2) flows in described cavity pipe (5a) through described brake hard tube (4a), thus promote the motion of described I shape piston (5d), brake fluid in described air-brake coupling hose (4b) is pressed in described wheel cylinder (6), and makes described Metallic rod (5c) that the slide block on described linear displacement transducer (5b) can be driven on described linear displacement transducer (5b) to produce displacement; Thus obtain first of described wheel cylinder (6) and need liquid measure.
2. brake fluid according to claim 1 needs liquid measure proving installation, it is characterized in that, described first needs liquid measure V to utilize formula (1) to calculate to obtain:
V＝S×L(1)
In formula (1), S represents the cross-sectional area of described I shape piston (5d); L represents the displacement of described linear displacement transducer (5b).
3. the brake fluid of brake system of car needs an application for liquid measure proving installation, it is characterized in that, arranges second again and need liquid measure proving installation between described brake hard tube (4a) and described air-brake coupling hose (4b);
To described first need liquid measure proving installation to obtain first need liquid measure (5) and second to need liquid measure proving installation (8) to obtain second need liquid measure to compare, thus obtain fit correlation.
4. the brake fluid of brake system of car needs an application for liquid measure proving installation, it is characterized in that, according to the stroke difference of described brake pedal (1) test described first need liquid measure proving installation (5) to produce first need liquid measure; Thus determine the best stroke of described brake pedal (1); Optimal brake power is produced with described best stroke.
5. the brake fluid of a brake system of car needs the application of liquid measure proving installation, it is characterized in that, needing the brake hard tube at liquid measure proving installation place (4a) arranges a pressure transducer (9), by the P-V characteristic test device needing liquid measure proving installation (5) and pressure transducer (9) to form wheel cylinder (6);
The pressure of the need liquid measure proving installation (5) to obtain by described first first brake hard tube (4a) needing liquid measure and pressure transducer (9) to obtain, thus obtain the P-V characteristic of described wheel cylinder (6).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610054781.1A CN105547713B (en) | 2016-01-25 | 2016-01-25 | A kind of brake fluid of brake system of car needs liquid measure test device and its application |
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| CN201610054781.1A CN105547713B (en) | 2016-01-25 | 2016-01-25 | A kind of brake fluid of brake system of car needs liquid measure test device and its application |
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| CN105547713B CN105547713B (en) | 2017-11-10 |
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| 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 |
| CN113933069A (en) * | 2021-11-22 | 2022-01-14 | 中国第一汽车股份有限公司 | Method and system for testing liquid amount required by brake caliper |
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| CN113933069B (en) * | 2021-11-22 | 2024-03-15 | 中国第一汽车股份有限公司 | Method and system for testing liquid amount required by brake caliper |
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