CN103217301B - A kind of apparatus and method of automobile brake perfrmance detection - Google Patents

A kind of apparatus and method of automobile brake perfrmance detection Download PDF

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Publication number
CN103217301B
CN103217301B CN201310125045.7A CN201310125045A CN103217301B CN 103217301 B CN103217301 B CN 103217301B CN 201310125045 A CN201310125045 A CN 201310125045A CN 103217301 B CN103217301 B CN 103217301B
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wheel
rolling mechanism
rolling
rotation speed
automobile brake
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CN103217301A (en
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张世兵
陈效华
陈军
王陆林
段山保
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Chery Automobile Co Ltd
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SAIC Chery Automobile Co Ltd
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Abstract

The invention discloses the apparatus and method of a kind of automobile brake perfrmance detection, this device includes inertial mechanism, drives the drive mechanism that inertial mechanism rotates, with the first rolling mechanism of wheel CONTACT WITH FRICTION, the first rotation speed detection unit, and the second rotation speed detection unit;Wherein, the first rolling mechanism is connected by the first synchronous drive mechanism with inertial mechanism, and the first rotation speed detection unit is for the rotating speed of detection the first rolling mechanism, and the second rotation speed detection unit is for detecting the rotating speed of wheel.These apparatus and method can obtain automobile brake perfrmance parameter by bench test with the simulated roadway brake force to automobile, improve the precision of the simulation test that bench test travels for automobile on road surface.This device can be used to carry out the single-wheel of automobile and braking performance of vehicle research, it is also possible to carries out vehicle dynamic quality, riding stability experimental study.And this installation cost is low, easily produces, it is simple to laboratory uses, beneficially operator's operation.

Description

A kind of apparatus and method of automobile brake perfrmance detection
Technical field
The invention belongs to automotive safety situation technical field, be specifically related to the apparatus and method of a kind of automobile brake perfrmance detection.
Background technology
Performance of ABS detection at present and test mainly have actual road test and bench test two kinds.Actual road test is widely used in performance of ABS detection and test, but current actual road test equipment cost is higher, and parameter acquisition procedure is complicated, and the fixed and positioned requirement of equipment is higher, and general R&D institution is difficult to carry out independent test.For detection and the test of performance of ABS, need that a kind of equipment is succinct, easy for installation, accuracy of detection is high, low cost, analysis device accurately and timely complete.
After automobile is braked rapidly when running at high speed, the same slipperiness on roads of tire often occur, in the case of tire is with slipperiness on roads, steering wheel rotation is inoperative, manipulation instability, and braking distance is the longest.Current vehicle both domestic and external nearly all equipped with automotive anti-lock braking brakes (ABS) with improve Motor Vehicle Braking Procedure manipulation stability and shorten braking distance.Also do not has the performance of ABS detection valuator device of molding at present, actual road test is mainly used to detect, but actual road test has certain danger, and requires a great deal of time and fund, especially ABS detection process after exploitation and product are collided is extremely limited.Although bench test low cost, the construction period is short, but time of day when cannot obtain automobile ABS work, bench test precision is low, and the parameter such as the dynamic property of ABS, work process and fault is difficult to obtain.So, develop a kind of can the time of day of authentic and valid acquisition automobile ABS work and dynamic property, improve the bench frame apparatus of precision of bench test, have become as problem the most in the urgent need to address.
Summary of the invention
The technical problem to be solved is for above-mentioned deficiency present in prior art, it is provided that the apparatus and method of a kind of automobile brake perfrmance detection.This device can obtain automobile brake perfrmance parameter by bench test with the simulated roadway brake force to automobile, improve the precision of the simulation test that bench test travels for automobile on road surface.
Solve the technology of the present invention problem and be employed technical scheme comprise that the device providing the detection of a kind of automobile brake perfrmance includes inertial mechanism, drive the drive mechanism that described inertial mechanism rotates, with the first rolling mechanism of wheel CONTACT WITH FRICTION, the first rotation speed detection unit, and the second rotation speed detection unit;Wherein, described first rolling mechanism is connected by the first synchronous drive mechanism with described inertial mechanism, and described first rotation speed detection unit is for detecting the rotating speed of described first rolling mechanism, and described second rotation speed detection unit is for detecting the rotating speed of described wheel.
Preferably, total rotary inertia of described drive mechanism, inertial mechanism and the first rolling mechanism is equal with the rotary inertia obtained by the conversion of described wheel translation quality of loads.
Preferably, described first rotation speed detection unit is arranged on described first rolling mechanism, and described second rotation speed detection unit is arranged on described wheel.
Preferably, automobile brake perfrmance detection device also include heavy burden mechanism, described heavy burden mechanism be arranged on on the wheel of described first rolling mechanism CONTACT WITH FRICTION.
Preferably, described drive mechanism is connected with described inertial mechanism by shaft coupling.
Preferably, the device of described automobile brake perfrmance detection also includes the second rolling mechanism, described second rolling mechanism is connected by the second synchronous drive mechanism with described first rolling mechanism, described first rolling mechanism and the second rolling mechanism all with described wheel CONTACT WITH FRICTION.
Preferably, the device of described automobile brake perfrmance detection also includes control unit, the rotary speed data of the described wheel that described control unit detects for the rotary speed data and described second rotation speed detection unit collecting described first rolling mechanism that described first rotation speed detection unit detects
Described control unit the start and stop to described drive mechanism are controlled, and calculate the slip rate between described wheel and described rolling mechanism.
Preferably, the device of described automobile brake perfrmance detection also includes time detecting unit, and/or the Torque test unit arranged on described first rolling mechanism, wherein, described time detecting unit is for detecting the rolling time of described first rolling mechanism, and described Torque test unit is for detecting the torque of described first rolling mechanism.
Preferably, described control unit is additionally operable to collect the time data that described time detecting unit detects;And/or for collecting the torque data of described first rolling mechanism that described Torque test unit detects;
Described control unit is additionally operable to calculate the average retardation rate MFDD of described first rolling mechanism, and/or the brake force that described first rolling mechanism is to described wheel.
Preferably, the device of described automobile brake perfrmance detection also includes: display unit, for showing the data that described control unit is collected.
Preferably, described control unit and brake system of car take interactive mode to work.
The present invention also provides for a kind of method using above-mentioned device to carry out automobile brake perfrmance detection, comprises the following steps:
Making drive mechanism drive inertial mechanism motion, described inertial mechanism drives the first rolling mechanism to rotate by the first synchronous drive mechanism, and described first rolling mechanism drives wheel rolling by CONTACT WITH FRICTION;
When being detected that by the first rotation speed detection unit the speed of described first rolling mechanism reaches automobile brake initial velocity v0Time, terminate the driving for described inertial mechanism of the described drive mechanism, described wheel is braked simultaneously;
Setting the speed speed as automobile of described first rolling mechanism, the rotating speed being recorded described first rolling mechanism by the first rotation speed detection unit is ωd, the speed v of the first rolling mechanismdd×Rd, the rotating speed being recorded described wheel by the second rotation speed detection unit is ωw, the speed of wheel is vww×Rw, record wheel described in braking procedure and the slip rate s between described rolling mechanism be:
s = v d - v w v d = ω d × R d - ω w × R w ω d × R d .
Preferably, the method for described automobile brake perfrmance detection is further comprising the steps of: use above-mentioned device during carrying out automobile brake perfrmance detection,
When the speed of described first rolling mechanism arrives 0.8v0Time, start timing by time detecting unit, until detecting that the speed of described first rolling mechanism reaches 0.1v0Time stop timing, calculating the displacement of described first rolling mechanism in during this period of time is S, calculates the average retardation rate MFDD of described first rolling mechanism:
MFDD=[(0.8v0)2-(0.1v0)2]/(25.92×S)。
Preferably, the method for described automobile brake perfrmance detection is further comprising the steps of:
The torque being recorded described first rolling mechanism by Torque test unit is Tr, the radius of described first rolling mechanism is Rd, convert described first rolling mechanism brake force to described wheel.
The apparatus and method of this automobile brake perfrmance detection can obtain automobile brake perfrmance parameter by bench test with the simulated roadway brake force to automobile, improve the precision of the simulation test that bench test travels for automobile on road surface.This device can be used to the research of single-wheel and the braking performance of vehicle carrying out automobile, it is also possible to carries out vehicle dynamic quality, riding stability experimental study.And this installation cost is low, easily produces, it is simple to laboratory uses, beneficially operator's operation.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the device of the automobile brake perfrmance detection in the embodiment of the present invention 1;
Fig. 2 is the installation drawing of the automobile brake perfrmance detection in the embodiment of the present invention 1;
Fig. 3 is the datagram of the automobile brake perfrmance using the Examining Method of Automobile Brake Capability in the embodiment of the present invention 2 to obtain.
In figure: 1-motor;2-flywheel;3-the first belt;4-the first torque rotary speed sensor;5-the first rotary drum;6-wheel;8 shaft couplings;9-bearing spider;10-charger frame;12-the second rotary drum;13-drum iron;14-the second belt;15-industrial computer;16-automobile ECU.
Detailed description of the invention
For making those skilled in the art be more fully understood that technical scheme, with detailed description of the invention, the present invention is described in further detail below in conjunction with the accompanying drawings.
Embodiment 1
As it is shown in figure 1, the present embodiment provides the device of a kind of automobile brake perfrmance detection, including inertial mechanism, drive the drive mechanism that described inertial mechanism rotates, with the first rolling mechanism of wheel 6 CONTACT WITH FRICTION, the first rotation speed detection unit, and the second rotation speed detection unit;Wherein, described first rolling mechanism is connected by the first synchronous drive mechanism with described inertial mechanism, and described first rotation speed detection unit is for detecting the rotating speed of described first rolling mechanism, and described second rotation speed detection unit is for detecting the rotating speed of described wheel 6.Wherein, inertial mechanism specifically uses flywheel 2, drive mechanism specifically uses motor 1, first rolling mechanism specifically uses the first rotary drum 5, first rotation speed detection unit specifically uses the first torque rotary speed sensor 4, second rotation speed detection unit specifically uses the second speed probe, the first synchronous drive mechanism specifically to use the first belt 3.Certainly, owing to inertial mechanism, drive mechanism, the first rolling mechanism, the first rotation speed detection unit, the second rotation speed detection unit, the first synchronous drive mechanism are known in the art general knowledge, except above-mentioned concrete mechanism or unit can be used, other known in those skilled in the art concrete structure or unit can also be used, repeat no more here.This device can control rotating speed and the direction of the first rotary drum 5 by controlling the rotating speed of motor 1, and the different rotation directions of motor 1 rotor by the gearing of whole device.Owing to the rotating speed of the first rotary drum 5 represents the speed of automobile, two contrary directions of the first rotary drum 5 represent two contrary directions of traveling of automobile, so can be travelled on road surface by simulated automotive fast and effectively by this device, and detect the braking ability of automobile accurately.Due to the size of the torque of the speed and the first rotary drum 5 that are controlled the first rotary drum 5 by motor 1, so the dynamic property of automobile, riding stability experimental study can be carried out by this device.
Preferably, total rotary inertia of described drive mechanism, inertial mechanism and the first rolling mechanism is equal with the rotary inertia obtained by the conversion of described wheel translation quality of loads.In the present embodiment, can select different flywheels 2, the selection of different flywheels 2 be by select a vehicle, then according to this vehicle thus the translation quality of loads of this car that converts conversion obtain rotary inertia, and then conversion obtains the rotary inertia of flywheel 2, thus select different flywheels 2.
Preferably, described first rotation speed detection unit is arranged on described first rolling mechanism, and described second rotation speed detection unit is arranged on described wheel 6.
As shown in Figure 2, it is preferred that described drive mechanism is connected with described inertial mechanism by shaft coupling 8.Motor 1 is fixedly mounted in charger frame 10 by bearing spider 9, and motor 1 is connected with flywheel 2 by shaft coupling 8 by the axle of the axle and flywheel 2 self of self.First rotary drum 5 is fixed in charger frame 10 by bearing spider 9, and the first belt 3 is socketed on the axle of the first rotary drum 5 self and the axle of flywheel 2 self, and such first rotary drum 5 achieves synchronous axial system with flywheel 2 by the first belt 3 transmission.Motor 1 rotates provides rotary inertia for flywheel 2, and power is transferred to flywheel 2 by shaft coupling 8 by motor 1, and when motor 1 rotating speed increases, the kinetic energy of flywheel 2 increases, and energy storage is got up, and the most also by the first belt 3, a part of kinetic energy can be passed to the first rotary drum 5;When motor 1 stops operating, flywheel 2 may proceed to rotate and energy is passed through the first belt 3 transmission to the first rotary drum 5.The Main Function of flywheel 2 is the device that can freely the adjust automobile brake perfrmance detection rotary inertia when braking.But motor 1 cannot directly drive the rotation of the first rotary drum 5, because the load of wheel 6 is very big, if motor 1 directly drives the first rotary drum 5 to rotate, then motor 1 electric current will be caused very big, thus burn out motor 1.First torque rotary speed sensor 4 is installed, for detection first rotary drum 5 rotating speed in rotation process on the axle of the first rotary drum 5.Wheel 6 is fixedly mounted in charger frame 10 by bearing spider 9, by CONTACT WITH FRICTION between wheel 6 and the first rotary drum 5, the material on the first rotary drum 5 surface is preferably the adhesive force on device that the adhesive force of this material detects close to this automobile brake perfrmance actual road surface to be detected.Placing wheel 6 on the first rotary drum 5, wheel 6 has the pressure of both contact surfaces vertical to the first rotary drum 5, is driven the rotation of the first rotary drum 5 by the frictional force between wheel 6 and the first rotary drum 5, simulates the road surface brake force for wheel 6.When the first rotary drum 5 rotates, when the wheel 6 tangential direction in himself outer circumference only exists the frictional force effect between wheel 6 and the first rotary drum 5, now the first rotary drum 5 band motor car wheel 6 rotates, and wheel 6 rolls on the first rotary drum 5 rather than slides.
Preferably, automobile brake perfrmance detection device also include heavy burden mechanism, described heavy burden mechanism be arranged on on the wheel 6 of described first rolling mechanism CONTACT WITH FRICTION.In the present embodiment, the first rolling mechanism specifically uses the first rotary drum 5, after arranging heavy burden mechanism on wheel 6, is equivalent to add the load to wheel 6, increases the wheel 6 pressure for the first rotary drum 5.When the first rotary drum 5 rotates, the wheel 6 tangential direction in its outer circumference only exists the frictional force effect between wheel 6 and the first rotary drum 5, and now the first rotary drum 5 band motor car wheel 6 rotates.By increasing the quality of heavy burden mechanism, so that the pressure of wheel 6 is increased by heavy burden mechanism, and then the frictional force between the first rotary drum 5 and wheel 6 also increases, it is possible to by changing the load of wheel 6, carries out different automobile brake perfrmance detections.
Preferably, the device of described automobile brake perfrmance detection also includes the second rolling mechanism, described second rolling mechanism is connected by the second synchronous drive mechanism with described first rolling mechanism, described first rolling mechanism and the second rolling mechanism all with described wheel 6 CONTACT WITH FRICTION.In the present embodiment, the first rolling mechanism specifically uses the first rotary drum 5, and the second rolling mechanism specifically uses the second rotary drum 12, and the first drive mechanism specifically uses the first belt 3, and the second drive mechanism specifically uses the second belt 14.First rotary drum 5 is in transmission connection by the first belt 3 with flywheel 2, and this first belt 3 is enclosed within the axle of first rotary drum 5 one end and on the axle of flywheel 2;First rotary drum 5 is in transmission connection by the second belt 14 with the second rotary drum 12, and this second belt 14 is socketed on the first other end of axle of rotary drum 5 and on the axle of the second rotary drum 12, and the first rotary drum 5 and the second rotary drum 12 are installed on drum iron 13.When using this device to carry out automobile brake perfrmance detection, detecting by being fixed on by wheel 6 between two rotary drums, the central shaft of the central shaft of wheel 6 and two rotary drums is parallel to each other.Certainly, the device of this automobile brake perfrmance detection can also include more with the second similar rotary drum being in transmission connection of rotary drum 12, and these rotary drums all with wheel 6 CONTACT WITH FRICTION.
Preferably, the device of described automobile brake perfrmance detection also includes control unit, wherein, the rotary speed data of the described wheel 6 that described control unit detects for the rotary speed data and described second rotation speed detection unit collecting described first rolling mechanism that described first rotation speed detection unit detects, described control unit the start and stop to described drive mechanism are controlled, and calculate the slip rate between described wheel 6 and described rolling mechanism.In the present embodiment, the first rotation speed detection unit specifically uses the first torque rotary speed sensor 4, and the second rotation speed detection unit specifically uses the second speed probe.Described control unit specifically uses industrial computer 15, the rotary speed data of the wheel 6 that industrial computer 15 gathers the rotary speed data of the first rotary drum 5 that the first torque rotary speed sensor 4 is collected by data collecting card and the second speed probe is collected, when the control needing to be driven drive mechanism or stop driving according to automobile brake perfrmance detection after the rotary speed data that industrial computer 15 receives.
Preferably, the device of described automobile brake perfrmance detection also includes time detecting unit, and/or the Torque test unit arranged on described first rolling mechanism, wherein, described time detecting unit is for detecting the rolling time of described first rolling mechanism, and described Torque test unit is for detecting the torque of described first rolling mechanism.Torque test unit specifically uses the first torque rotary speed sensor 4.
Preferably, described control unit is additionally operable to collect the time data that described time detecting unit detects;And/or for collecting the torque data of described first rolling mechanism that described Torque test unit detects;
Described control unit is additionally operable to calculate the average retardation rate MFDD of described first rolling mechanism, and/or the brake force that described first rolling mechanism is to described wheel 6.Described control unit specifically uses industrial computer 15, time data that industrial computer 15 is detected by data collecting card acquisition time detector unit and the torque data of the first rolling mechanism that Torque test unit detects.Industrial computer 15 collects these data by online, Motor Vehicle Braking Procedure can be carried out the most real-time research, the real-time slip rate being calculated between described wheel 6 and described rolling mechanism, and/or the average retardation rate MFDD of described first rolling mechanism, and/or the brake force that described first rolling mechanism is to described wheel 6.The data that industrial computer 15 obtains accurately and timely, have the biggest benefit for On-line Control automobile brake.And industrial computer 15 not only can collect the data that the brake function test of traditional hydraulic ABS brakes arrives, and the data that the brake function test that can collect the abs braking system of brake-by-wire arrives.
Preferably, the device of described automobile brake perfrmance detection also includes display unit, for showing the data that described control unit is collected.Display unit specifically uses display, and the various data collected industrial computer 15 by display and calculated various data carry out the display of real-time online, can ABS for brake-by-wire study online.
Preferably, described control unit and brake system of car take interactive mode to work.The braking ability of the brake system of car that this device can be detected by control unit feeds back in time, and controls the braking of brake system of car.The switch of motor 1 is also controlled by industrial computer 15, controls the motor 1 driving to flywheel 2, and industrial computer 15 receives the CAN signal of the vehicle that automobile ECU (electronic control unit) 16 sends the most at any time simultaneously.Can the analysis of the data of various braking abilities by control unit is collected, On-line Control brake system of car, and adjust the various parameters of brake system of car, thus optimize the parameter in the various braking procedures of brake system of car.
Owing to automobile also exists two-wheel drive, four-wheel drive and the difference of front and back wheel 6 stress, so brake system of car takes different braking methods for the different wheel 6 of automobile by arranging different brake parameterses, the device of this automobile brake perfrmance detection can detect the brake system of car braking ability for the different wheel 6 of the automobile of simulation.Certainly, the device of four automobile brake perfrmance detections can also be made, and be completely independent between them, respectively four wheels 6 of automobile are carried out automobile brake perfrmance detection, the data that these four automobile brake perfrmance detection devices detect can be collected by an industrial computer 15, and optimizes automobile brake perfrmance by industrial computer 15.The device of this automobile brake perfrmance detection, can from the prototype research of automobile, model machine develop automobile manufacture experimently whole during the research of automobile brake perfrmance.
The device of this automobile brake perfrmance detection can obtain automobile brake perfrmance parameter by bench test with the simulated roadway brake force to automobile, improve the precision of the simulation test that bench test travels for automobile on road surface.This device can be used to the research of single-wheel and the braking performance of vehicle carrying out automobile, it is also possible to carries out vehicle dynamic quality, riding stability experimental study.And this installation cost is low, easily produces, it is simple to laboratory uses, beneficially operator's operation.
Embodiment 2
The present embodiment provides a kind of method using above-mentioned device to carry out automobile brake perfrmance detection, comprises the following steps:
(1) making drive mechanism drive inertial mechanism motion, described inertial mechanism drives the first rolling mechanism to rotate by the first synchronous drive mechanism, and described first rolling mechanism is rolled by CONTACT WITH FRICTION band motor car wheel 6.Wherein, inertial mechanism specifically uses flywheel 2, and drive mechanism specifically uses motor 1, the first rolling mechanism specifically to use the first rotary drum 5, and the first synchronous drive mechanism specifically uses the first belt 3.Wherein, total rotary inertia of the first rotary drum 5, flywheel 2 and motor 1 is identical with the rotary inertia obtained by the conversion of wheel 6 translation quality of loads.
(2) in the device that this automobile brake perfrmance detects, being simulated automobile in the traveling on road surface, the rotating speed setting the first rotary drum 5 is equivalent to the speed of automobile.As it is shown in figure 1, when carrying out automobile brake perfrmance detection, first rotary drum 5 and flywheel 2 are accelerated by motor 1, accelerate to the automobile brake initial velocity v of test requirements document0, terminate the motor 1 driving for flywheel 2, now the first torque rotary speed sensor 4 records the angular velocity omega of the first rotary drum 5d0=v0/Rd, the second speed probe records the angular velocity omega w of wheel 60=v0/Rw.Wherein, the radius of the first rotary drum 5 is Rd, the radius of wheel 6 is Rw.By ABS, wheel 6 is braked, naturally it is also possible to use simulating brake system to be studied.Now, wheel 6 rotating speed constantly reduces, and it is slow that the first rotary drum 5 and flywheel 2 are reduced relatively wheel 6 rotating speed by effect of inertia rotating speed, and the rotating speed being recorded described first rotary drum 5 by the first torque rotary speed sensor 4 is ωd,
The speed v of the first rotary drum 5dd×Rd, the rotating speed being recorded described wheel 6 by the second speed probe is ωw, the speed of wheel 6 is vww×Rw, record wheel 6 described in braking procedure and the slip rate s between described first rotary drum 5 be:
s = v d - v w v d = ω d × R d - ω w × R w ω d × R d
Before being braked wheel 6, the first rotary drum 5 is rotated by frictional force band motor car wheel 6, and the speed of the first rotary drum 5 is identical with the speed of wheel 6.When stopping motor 1 is for the driving of flywheel 2, being braked wheel 6, now the speed of wheel 6 constantly reduces.Owing to flywheel 2 stores energy, flywheel 2 and the first rotary drum 5, to be reduced relatively wheel 6 by its rotating speed of effect of inertia slow.After being braked wheel 6, wheel 6 not only receives first rotary drum 5 frictional force for wheel 6 along the tangential direction of its excircle, also receives the ABS of the automobile brake force to wheel 6 simultaneously, and now the speed of the first rotary drum 5 is different from the speed of wheel 6.As shown in Figure 1, when motor 1 drives flywheel 2 to rotate, the rotor clockwise of motor 1 rotates, motor 1 is turned clockwise by shaft coupling 8 flywheel driven 2, flywheel 2 drives the first rotary drum 5 to turn clockwise by the first belt 3 transmission being enclosed within its axle, and the frictional force band motor car wheel 6 of wheel 6 is rotated counterclockwise by the first rotary drum 5 by the first rotary drum 5.When wheel 6 is braked by ABS, ABS is counterclockwise to the torque direction of wheel 6.
(3) 0.8v is arrived when the speed of described first rolling mechanism0Time, start timing by time detecting unit, until detecting and stopping timing when the speed of described first rolling mechanism reaches 0.1v0, calculating the displacement of described rolling mechanism in during this period of time is S, calculates the average retardation rate MFDD of described rolling mechanism:
MFDD=[(0.8v0)2-(0.1v0)2]/(25.92×S)
(4) recording the torque of described first rolling mechanism by Torque test unit is Tr, the radius of described first rolling mechanism is Rd, convert described first rolling mechanism brake force to described wheel 6.As it is shown in figure 1, when carrying out when only having the first rotary drum 5 of CONTACT WITH FRICTION with wheel 6, described first rolling mechanism is F to the brake force of described wheel 6r=Tr/Rd.As shown in Figure 2, when carrying out the first rotary drum 5 and second rotary drum 12 of CONTACT WITH FRICTION with wheel 6, and the specification of two rotary drums is the same, the first rotary drum 5 is in transmission connection by the first belt 3 with flywheel 2, and this first belt 3 is enclosed within the axle of first rotary drum 5 one end and on the axle of flywheel 2;Being in transmission connection by the second belt 14 with the second rotary drum 12 at the first rotary drum 5, this second belt 14 is socketed on the first other end of axle of rotary drum 5 and on the axle of the second rotary drum 12, and the first rotary drum 5 and the second rotary drum 12 are installed on drum iron 13.When using this device to carry out automobile brake perfrmance detection, detecting by being fixed on by wheel 6 between two rotary drums, the central shaft of the central shaft of wheel 6 and two rotary drums is parallel to each other.Now, Torque test unit records the torque of wherein the first rotary drum 5 is 2Tr', then the torque of the second rotary drum 12 is also 2Tr', the first rotary drum 5 is T to the torque that wheel 6 appliesr', first rotary drum 5 brake force F to wheel 6r'=Tr’/Rd, the second rotary drum 12 is also F to the brake force of wheel 6r'=Tr’/Rd, wherein, the radius of the first rotary drum 5 and the second rotary drum 12 is Rd
As it is shown in figure 1, in the device that this automobile brake perfrmance detects, automobile is simulated in the traveling on road surface, sets the first rotary drum 5 and the road surface brake force for wheel 6 is equivalent to for the brake force of wheel 6.When wheel 6 is braked, wheel 6 by ABS for braking moment T of wheel 6b.First rotary drum 5 is by the wheel 6 brake force F to the first rotary drum 5x, the wheel 6 brake force F to the first rotary drum 5xThe first rotary drum 5, flywheel 2 is made to slow down together with motor 1.When the first rotary drum 5 rotating speed reaches v0Stop the driving to motor 1, and after wheel 6 is braked, the rotary inertia of flywheel 2 makes the first rotary drum 5, flywheel 2 and the total rotary inertia of motor 1 rotor equal with the rotary inertia obtained by the conversion of wheel 6 translation quality of loads, so that flywheel 2 system has the inertia effect being equal to, the wheel 6 that the torque therefore recorded is obtained brake force F to the first rotary drum 5 by the first torque rotary speed sensor 4 with vehicle translationxSuitable with wheel 6 road surface actual braking force.In braking procedure, by measuring slip rate and brake force in real time, abs braking performance can be tested.When wheel 6 is braked, the kinetics equation of wheel 6:
Iwωw=FxRw-Tb
Wherein, FxFor the wheel 6 brake force to the first rotary drum 5, RwFor the radius of wheel 6, IwFor the rotary inertia of wheel 6, ωwFor the angular acceleration of wheel 6, TbFor ABS for the braking moment of wheel 6.
First rotary drum 5 acts on the brake force direction on wheel 6 and the wheel 6 brake force F to the first rotary drum 5 in Fig. 1xIn opposite direction.When wheel 6 is braked, the first rotary drum 5, flywheel 2, motor 1 rotor dynamics equation:
Te-FxRd=Idωd+Ifωf+Ieωe
Wherein, IdIt is the first rotary drum 5 rotary inertia, IfFor flywheel 2 rotary inertia, IeFor motor 1 rotary inertia, ωdIt is the angular acceleration of the first rotary drum 5, ωfFor the angular acceleration of flywheel 2, ωeFor the angular acceleration of motor 1, TeFor motor 1 torques, other parameter is ibid.It can be seen that the method for this automobile brake perfrmance detection simulates automobile traveling on road surface accurately from the kinetics equation of above-mentioned wheel 6 and the kinetics equation of motor 1 rotor, record the parameter of reaction automobile brake perfrmance.
At the device of above-mentioned use automobile brake perfrmance detection, and during the method using above-mentioned automobile brake perfrmance detect carries out automobile brake perfrmance detection, the braking ability of ABS can be tested by the heavy burden of increase wheel;The material (owing to the frictional force between different materials is different, select the material on the first rotary drum 5 surface and/or the material of wheel 6 to be equivalent to simulate the different frictional force on different road surface) of material and/or wheel 6 by changing the first rotary drum 5 surface can also test the braking ability of ABS.
As it is shown on figure 3, list the various parameters of the automobile brake perfrmance using the method for this automobile brake perfrmance detection to obtain, it is possible to achieve the online monitoring to automobile brake perfrmance.
It is understood that the principle that is intended to be merely illustrative of the present of embodiment of above and the illustrative embodiments that uses, but the invention is not limited in this.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.

Claims (10)

1. the device of an automobile brake perfrmance detection, it is characterised in that include inertial mechanism, drive the drive mechanism that described inertial mechanism rotates, with the first rolling mechanism of wheel CONTACT WITH FRICTION, the first rotation speed detection unit, and the second rotation speed detection unit;Wherein, described first rolling mechanism is connected by the first synchronous drive mechanism with described inertial mechanism, and described first rotation speed detection unit is for detecting the rotating speed of described first rolling mechanism, and described second rotation speed detection unit is for detecting the rotating speed of wheel;
Total rotary inertia of described drive mechanism, inertial mechanism and the first rolling mechanism is equal with the rotary inertia obtained by the conversion of wheel translation quality of loads;
Set the speed speed as automobile of described first rolling mechanism, set the radius of the first rolling mechanism as Rd, the rotating speed being recorded described first rolling mechanism by the first rotation speed detection unit is ωd, the speed v of the first rolling mechanismdd×Rd, the rotating speed being recorded described wheel by the second rotation speed detection unit is ωw, the speed of wheel is vww×Rw, record wheel described in braking procedure and the slip rate s between described rolling mechanism be:
In braking procedure, by measuring in real time slip rate and brake force, abs braking performance can be tested:
During to wheel braking, the kinetics equation of the wheel of employing is as follows:
Iwωw=FxRw-Tb
Wherein, FxFor the wheel brake force to the first rolling mechanism, RwFor the radius of wheel, IwFor the rotary inertia of wheel, ωwFor the angular acceleration of wheel, TbFor ABS for the braking moment of wheel.
The device of automobile brake perfrmance the most according to claim 1 detection, it is characterised in that described first rotation speed detection unit is arranged on described first rolling mechanism, and described second rotation speed detection unit is arranged on described wheel.
Automobile brake perfrmance the most according to claim 1 detection device, it is characterised in that also include heavy burden mechanism, described heavy burden mechanism be arranged on on the wheel of described first rolling mechanism CONTACT WITH FRICTION.
The device of automobile brake perfrmance the most according to claim 1 detection, it is characterized in that, also include the second rolling mechanism, described second rolling mechanism is connected by the second synchronous drive mechanism with described first rolling mechanism, described first rolling mechanism and the second rolling mechanism all with described wheel CONTACT WITH FRICTION.
The device of automobile brake perfrmance the most according to claim 1 detection, it is characterized in that, also include control unit, the rotary speed data of the described wheel that described control unit detects for the rotary speed data and described second rotation speed detection unit collecting described first rolling mechanism that described first rotation speed detection unit detects
Described control unit the start and stop to described drive mechanism are controlled, and calculate the slip rate between described wheel and described rolling mechanism.
The device of automobile brake perfrmance the most according to claim 5 detection, it is characterized in that, also include time detecting unit, and/or the Torque test unit arranged on described first rolling mechanism, wherein, described time detecting unit is for detecting the rolling time of described first rolling mechanism, and described Torque test unit is for detecting the torque of described first rolling mechanism.
The device of automobile brake perfrmance the most according to claim 6 detection, it is characterised in that described control unit is additionally operable to collect the time data that described time detecting unit detects;And/or for collecting the torque data of described first rolling mechanism that described Torque test unit detects;
Described control unit is additionally operable to calculate the average retardation rate MFDD of described first rolling mechanism, and/or the brake force that described first rolling mechanism is to described wheel.
8. use the method that the device described in claim 1~7 any one carries out automobile brake perfrmance detection, it is characterized in that, total rotary inertia of described drive mechanism, inertial mechanism and the first rolling mechanism is equal with the rotary inertia obtained by the conversion of described wheel translation quality of loads;
The method comprises the following steps:
Making drive mechanism drive inertial mechanism motion, described inertial mechanism drives the first rolling mechanism to rotate by the first synchronous drive mechanism, and described first rolling mechanism drives wheel rolling by CONTACT WITH FRICTION;
When being detected that by the first rotation speed detection unit the speed of described first rolling mechanism reaches automobile brake initial velocity v0Time, terminate the driving for described inertial mechanism of the described drive mechanism, described wheel is braked simultaneously;
Set the speed speed as automobile of described first rolling mechanism, set the radius of the first rolling mechanism as Rd, the rotating speed being recorded described first rolling mechanism by the first rotation speed detection unit is ωd, the speed v of the first rolling mechanismdd×Rd, the rotating speed being recorded described wheel by the second rotation speed detection unit is ωw, the speed of wheel is vww×Rw, record wheel described in braking procedure and the slip rate s between described rolling mechanism be:
During to wheel braking, the kinetics equation of the wheel of employing is as follows:
Iwωw=FxRw-Tb
Wherein, FxFor the wheel brake force to the first rolling mechanism, RwFor the radius of wheel, IwFor the rotary inertia of wheel, ωwFor the angular acceleration of wheel, TbFor ABS for the braking moment of wheel;
In braking procedure, by measuring slip rate and brake force in real time, abs braking performance can be tested.
The method of automobile brake perfrmance the most according to claim 8 detection, it is characterised in that further comprising the steps of: use the device described in claim 7 during carrying out automobile brake perfrmance detection,
When the speed of described first rolling mechanism arrives 0.8v0Time, start timing by time detecting unit, until detecting that the speed of described first rolling mechanism reaches 0.1v0Time stop timing, calculating the displacement of described first rolling mechanism in during this period of time is S, calculates the average retardation rate MFDD of described first rolling mechanism:
MFDD=[(0.8v0)2-(0.1v0)2]/(25.92×S)。
The method of automobile brake perfrmance the most according to claim 8 detection, it is characterised in that further comprising the steps of: during carrying out automobile brake perfrmance detection,
The torque being recorded described first rolling mechanism by Torque test unit is Tr, the radius of described first rolling mechanism is RdConvert described first rolling mechanism brake force to described wheel.
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