CN103217301A - Device and method for detecting brake performance of automobile - Google Patents

Device and method for detecting brake performance of automobile Download PDF

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Publication number
CN103217301A
CN103217301A CN2013101250457A CN201310125045A CN103217301A CN 103217301 A CN103217301 A CN 103217301A CN 2013101250457 A CN2013101250457 A CN 2013101250457A CN 201310125045 A CN201310125045 A CN 201310125045A CN 103217301 A CN103217301 A CN 103217301A
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China
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rolling
wheel
automobile brake
detects
automobile
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CN2013101250457A
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CN103217301B (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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Chery Automobile Co Ltd
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Abstract

The invention discloses a device and method for detecting brake performance of an automobile. The device comprises an inertia mechanism, a driving mechanism, a first rolling mechanism, a first revolving speed detecting unit and a second revolving speed detecting unit, wherein the driving mechanism drives the inertia mechanism to rotate, the first rolling mechanism is contacted with car wheels in a friction mode, the first rolling mechanism is connected with the inertia mechanism through a first synchronous transmission mechanism, the first revolving speed detecting unit is used for detecting the revolving speed of the first rolling mechanism, and the second revolving speed detecting unit is used for detecting the revolving speed of the car wheels. The device and the method for detecting the brake performance of the automobile can simulate braking force of the road surface on the automobile, obtains brake performance parameters of the automobile through a bench test and improves the precision of a simulating test of driving of the automobile on the road surface. The device can be used for conducting a brake performance study on a single wheel and the whole automobile, and also can be used for conducting a testing study on the dynamic quality and driving stability of the automobile. The device for detecting the brake performance of the automobile has the advantages of being low in cost, easy to produce, capable of being conveniently used by a laboratory, and beneficial to operation of operating personnel.

Description

The apparatus and method that a kind of automobile brake perfrmance detects
Technical field
The invention belongs to automotive safety situation technical field, be specifically related to the apparatus and method that a kind of automobile brake perfrmance detects.
Background technology
At present performance of ABS detects and test mainly contains two kinds of actual road test and bench tests.During the performance of ABS that is widely used in actual road test detects and tests, but present actual road test equipment cost is higher, parameter acquiring process complexity, and equipment installation and positioning requirements are higher, and general R﹠D institution is difficult for independently testing.For the detection and the test of performance of ABS, the device that a kind of equipment of needs is succinct, easy for installation, accuracy of detection is high, cost is low, analyze is accurately and timely finished.
After automobile is braked when running at high speed rapidly, tend to occur tire and skid with the road surface, under the situation that tire skids with the road surface, steering wheel rotation is inoperative, controls instability, and braking distance is very long.Present vehicle both domestic and external nearly all is equipped with automotive anti-lock braking brake system (ABS) to improve controlling stability and shortening braking distance of Motor Vehicle Braking Procedure.Do not have at present the performance of ABS of moulding to detect valuator device in addition, mainly be to adopt actual road test to detect, but actual road test has certain danger, and requires a great deal of time and fund, and especially the testing process of ABS after exploitation and product collision is subjected to great restriction.Though the bench test cost is low, the construction period is short, the time of day in the time of can't obtaining automobile ABS work, and the bench test precision is low, and parameters such as the dynamic property of ABS, the course of work and fault are difficult for obtaining.So, develop a kind of time of day and the dynamic property that can authentic and validly obtain automobile ABS work, improve the bench frame apparatus of the precision of bench test, become the current problem that presses for solution.
Summary of the invention
Technical matters to be solved by this invention is at above shortcomings in the prior art, the apparatus and method that provide a kind of automobile brake perfrmance to detect.This device can simulated roadway to the damping force of automobile, obtain the automobile brake perfrmance parameter by bench test, improved the precision of the simulation test that bench test travels for automobile on the road surface.
The device that the technical scheme that solution the technology of the present invention problem is adopted provides a kind of automobile brake perfrmance detection comprises inertia mechanism, drive the driving mechanism that described inertia mechanism rotates, with first rolling mechanism of wheel rubbing contact, first rotation speed detection unit, and second rotation speed detection unit; Wherein, described first rolling mechanism is connected by first synchronous drive mechanism with described inertia mechanism, and described first rotation speed detection unit is used to detect the rotating speed of described first rolling mechanism, and described second rotation speed detection unit is used to detect the rotating speed of described wheel.
Preferably, total moment of inertia of described driving mechanism, inertia mechanism and first rolling mechanism equates with the moment of inertia that obtains that converts by 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 the described wheel.
Preferably, the device that automobile brake perfrmance detects also includes heavy burden mechanism, and described heavy burden mechanism is arranged on the wheel with the described first rolling mechanism rubbing contact.
Preferably, described driving mechanism is connected with described inertia mechanism by shaft coupling.
Preferably, the device that described automobile brake perfrmance detects also comprises second rolling mechanism, described second rolling mechanism is connected by second synchronous drive mechanism with described first rolling mechanism, described first rolling mechanism and second rolling mechanism all with described wheel rubbing contact.
Preferably, the device that described automobile brake perfrmance detects also comprises control module, described control module is used to collect the rotary speed data of detected described first rolling mechanism of described first rotation speed detection unit and the rotary speed data of the detected described wheel of described second rotation speed detection unit
Described control module is also controlled the start and stop of described driving mechanism, and calculates the slip rate between described wheel and the described rolling mechanism.
Preferably, the device that described automobile brake perfrmance detects also comprises the time detecting unit, and/or the torque detecting unit that is provided with on described first rolling mechanism, wherein, described time detecting unit is used to detect the rolling time of described first rolling mechanism, and described torque detecting unit is used to detect the torque of described first rolling mechanism.
Preferably, described control module also is used to collect the detected time data in described time detecting unit; And/or the torque data that is used to collect detected described first rolling mechanism of described torque detecting unit;
Described control module also is used to calculate the average retardation rate MFDD of described first rolling mechanism, and/or described first rolling mechanism is to the damping force of described wheel.
Preferably, the device of described automobile brake perfrmance detection also comprises: display unit is used to the data that show that described control module is collected.
Preferably, described control module and brake system of car are taked interactive mode work.
The present invention also provides a kind of and uses above-mentioned device to carry out the method that automobile brake perfrmance detects, and may further comprise the steps:
Make drive mechanism inertia mechanism kinematic, described inertia mechanism drives first rolling mechanism by first synchronous drive mechanism and rotates, and described first rolling mechanism drives wheel rolling by rubbing contact;
When the speed that detects described first rolling mechanism by first rotation speed detection unit reaches automobile brake initial velocity v 0The time, stop of the driving of described driving mechanism for described inertia mechanism, simultaneously described wheel is braked;
The speed of setting described first rolling mechanism is the speed of a motor vehicle of automobile, and the rotating speed that records described first rolling mechanism by first rotation speed detection unit is ω d, the speed v of first rolling mechanism dd* R d, the rotating speed that records described wheel by second rotation speed detection unit is ω w, the speed of wheel is v ww* R w, the slip rate s that records between wheel described in the braking procedure and the described rolling mechanism is:
s = v d - v w v d = ω d × R d - ω w × R w ω d × R d
Preferably, the method that described automobile brake perfrmance detects is further comprising the steps of: in carrying out the automobile brake perfrmance testing process, use above-mentioned device,
Speed arrival 0.8v when described first rolling mechanism 0The time, pick up counting by the time detecting unit, reach 0.1v up to the speed that detects described first rolling mechanism 0The time stop timing, the displacement of described first rolling mechanism is S in calculating during this period of time, calculates the average retardation rate MFDD of described first rolling mechanism:
MFDD=[(0.8v 02-(0.1v 0) 2]/(25.92×S)。
Preferably, the method for described automobile brake perfrmance detection is further comprising the steps of:
The torque that records described first rolling mechanism by the torque detecting unit is T r, the radius of described first rolling mechanism is R r, the damping force of described first rolling mechanism to described wheel converts.
The apparatus and method that this automobile brake perfrmance detects can simulated roadway to the damping force of automobile, obtain the automobile brake perfrmance parameter by bench test, improved the precision of the simulation test that bench test travels for automobile on the road surface.This device can be used for carrying out the single-wheel of automobile and the research of braking performance of vehicle, also can carry out vehicle dynamic quality, riding stability experimental study.And this installation cost is low, easily produces, and is convenient to the laboratory and uses, and is beneficial to operating personnel's operation.
Description of drawings
Fig. 1 is the schematic diagram of the device of the automobile brake perfrmance detection in the embodiment of the invention 1;
Fig. 2 is the installation drawing that the automobile brake perfrmance in the embodiment of the invention 1 detects;
Fig. 3 is to use the data plot of the automobile brake perfrmance of the automobile brake perfrmance detection method acquisition in the embodiment of the invention 2.
Among the figure: the 1-motor; The 2-flywheel; 3-first belt; 4-first torque rotary speed sensor; 5-first rotary drum; The 6-wheel; 8 shaft couplings; The 9-bearing spider; 10-charger frame; 12-second rotary drum; The 13-drum iron; 14-second belt; The 15-industrial computer; The 16-automobile ECU.
Embodiment
For making those skilled in the art understand technical scheme of the present invention better, the present invention is described in further detail below in conjunction with the drawings and specific embodiments.
Embodiment 1
As shown in Figure 1, the device that present embodiment provides a kind of automobile brake perfrmance to detect comprises inertia mechanism, drive the driving mechanism that described inertia mechanism rotates, with first rolling mechanism of wheel 6 rubbing contact, first rotation speed detection unit, and second rotation speed detection unit; Wherein, described first rolling mechanism is connected by first synchronous drive mechanism with described inertia mechanism, and described first rotation speed detection unit is used to detect the rotating speed of described first rolling mechanism, and described second rotation speed detection unit is used to detect the rotating speed of described wheel 6.Wherein, inertia mechanism specifically adopts flywheel 2, driving mechanism specifically adopts motor 1, concrete first rotary drum 5 that adopts of first rolling mechanism, concrete first torque rotary speed sensor 4 that adopts of first rotation speed detection unit, concrete second speed probe that adopts of second rotation speed detection unit, concrete first belt 3 that adopts of first synchronous drive mechanism.Certainly, because inertia mechanism, driving mechanism, first rolling mechanism, first rotation speed detection unit, second rotation speed detection unit, first synchronous drive mechanism are general knowledge known in this field, except adopting above-mentioned concrete mechanism or unit, also can adopt other known in those skilled in the art concrete structure or unit, repeat no more here.Can be in this device by the rotating speed of control motor 1, and the different rotation directions of motor 1 rotor are controlled the rotating speed and the direction of first rotary drum 5 by the gearing of whole device.Because the rotating speed of first rotary drum 5 has been represented the speed of a motor vehicle of automobile, two opposite directions of first rotary drum 5 have been represented two the opposite directions of travelling of automobile, so by this device fast and effectively simulated automotive on the road surface, travel and the braking ability that detects automobile accurately.Because the size of the speed by motor 1 control first rotary drum 5 and the torque of first rotary drum 5 is so can carry out dynamic property, the riding stability experimental study of automobile by this device.
Preferably, total moment of inertia of described driving mechanism, inertia mechanism and first rolling mechanism equates with the moment of inertia that obtains that converts by described wheel translation quality of loads.In the present embodiment, can select different flywheel 2, the selection of different flywheels 2 is by selecting a vehicle, thereby converts and obtain moment of inertia according to the convert translation quality of loads of this car of this vehicle then, and then convert and to obtain the moment of inertia of flywheel 2, thereby selected different flywheel 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 the described wheel 6.
As shown in Figure 2, preferably, described driving mechanism is connected with described inertia mechanism by shaft coupling 8.Motor 1 is fixedly mounted on the charger frame 10 by bearing spider 9, and motor 1 is by spool being connected with flywheel 2 by shaft coupling 8 of axle and flywheel 2 self of self.First rotary drum 5 is fixed on the charger frame 10 by bearing spider 9, and on the axle of the axle that first belt 3 is socketed in first rotary drum 5 self and flywheel 2 self, such first rotary drum 5 and flywheel 2 have been realized synchronous rotation by 3 transmissions of first belt.Motor 1 rotation provides moment of inertia for flywheel 2, motor 1 is passed to flywheel 2 with power by shaft coupling 8, and when motor 1 rotating speed increased, the kinetic energy of flywheel 2 increased, store energy is got up, also can a part of kinetic energy be passed to first rotary drum 5 simultaneously by first belt 3; When motor 1 stopped operating, flywheel 2 can be rotated further and give first rotary drum 5 energy by 3 transmissions of first belt.The main effect of flywheel 2 is freely to adjust the moment of inertia of device when braking that automobile brake perfrmance detects.But motor 1 cannot directly drive the rotation of first rotary drum 5, because the load of wheel 6 is very big, rotates if motor 1 directly drives first rotary drum 5, will cause motor 1 electric current very big so, thereby burn out motor 1.On the axle of first rotary drum 5 first torque rotary speed sensor 4 is installed, is used for detecting the rotating speed of first rotary drum 5 at rotation process.Wheel 6 is fixedly mounted on the charger frame 10 by bearing spider 9, by rubbing contact, the adhesion that the material on first rotary drum, 5 surfaces is preferably this material approaches the adhesion on the actual road surface that device that this automobile brake perfrmance detects will detect between the wheel 6 and first rotary drum 5.Place wheel 6 on first rotary drum 5,6 pairs first rotary drums 5 of wheel have the pressure of vertical both surface of contact, drive the rotation of first rotary drum 5 by the friction force between the wheel 6 and first rotary drum 5, have simulated the damping force of road surface for wheel 6.When first rotary drum 5 rotated, wheel 6 only existed the friction force between the wheel 6 and first rotary drum 5 to do the time spent in the tangential direction of himself excircle part, and this moment first, rotary drum 5 drove wheel 6 rotations, and wheel 6 rolls on first rotary drum 5, rather than slides.
Preferably, the device that automobile brake perfrmance detects also includes heavy burden mechanism, and described heavy burden mechanism is arranged on the wheel 6 with the described first rolling mechanism rubbing contact.Concrete first rotary drum 5 that adopts of first rolling mechanism when after on the wheel 6 heavy burden mechanism being set, is equivalent to increase the load to wheel 6 in the present embodiment, has increased the pressure of wheel 6 for first rotary drum 5.When first rotary drum 5 rotated, only there was friction force effect between wheel 6 and first rotary drum 5 in wheel 6 in the tangential direction of its excircle part, and this moment first, rotary drum 5 drove wheels 6 rotations.By increasing the quality of heavy burden mechanism, thereby make heavy burden mechanism increase, and then the friction force between first rotary drum 5 and the wheel 6 also increase, so can carry out different automobile brake perfrmance detections by changing the load of wheel 6 to the pressure of wheel 6.
Preferably, the device that described automobile brake perfrmance detects also comprises second rolling mechanism, described second rolling mechanism is connected by second synchronous drive mechanism with described first rolling mechanism, described first rolling mechanism and second rolling mechanism all with described wheel 6 rubbing contact.Concrete concrete concrete concrete second belt 14 that adopts of first belt, 3, the second gear trains that adopts of second rotary drum, 12, the first gear trains that adopts of first rotary drum, 5, the second rolling mechanisms that adopts of first rolling mechanism in the present embodiment.First rotary drum 5 is in transmission connection by first belt 3 with flywheel 2, the axle that this first belt 3 is enclosed within first rotary drum, 5 one ends go up and the axle of flywheel 2 on; First rotary drum 5 and second rotary drum 12 are in transmission connection by second belt 14, the axle that this second belt 14 is socketed in first rotary drum, 5 other ends go up and the axle of second rotary drum 12 on, first rotary drum 5 and second rotary drum 12 are installed on the drum iron 13.When using this device to carry out the automobile brake perfrmance detection, by being fixed between two rotary drums, wheel 6 detects, and the central shaft of the central shaft of wheel 6 and two rotary drums is parallel to each other.Certainly, the device that this automobile brake perfrmance detects can also comprise more and second rotary drum, the 12 similar rotary drums that are in transmission connection, and these rotary drums all with wheel 6 rubbing contact.
Preferably, the device that described automobile brake perfrmance detects also comprises control module, wherein, described control module is used to collect the rotary speed data of detected described first rolling mechanism of described first rotation speed detection unit and the rotary speed data of the detected described wheel 6 of described second rotation speed detection unit, described control module is also controlled the start and stop of described driving mechanism, and calculates the slip rate between described wheel 6 and the described rolling mechanism.Concrete concrete second speed probe that adopts of first torque rotary speed sensor, 4, the second rotation speed detection unit that adopts of first rotation speed detection unit in the present embodiment.Described control module specifically adopts industrial computer 15, industrial computer 15 is gathered the rotary speed data of first rotary drum 5 that first torque rotary speed sensor 4 collects and the rotary speed data of the wheel 6 that second speed probe is collected by data collecting card, the control that the needs that detect according to automobile brake perfrmance behind the rotary speed data that industrial computer 15 receives drive or stop to drive driving mechanism.
Preferably, the device that described automobile brake perfrmance detects also comprises the time detecting unit, and/or the torque detecting unit that is provided with on described first rolling mechanism, wherein, described time detecting unit is used to detect the rolling time of described first rolling mechanism, and described torque detecting unit is used to detect the torque of described first rolling mechanism.Concrete first torque rotary speed sensor 4 that adopts of torque detecting unit.
Preferably, described control module also is used to collect the detected time data in described time detecting unit; And/or the torque data that is used to collect detected described first rolling mechanism of described torque detecting unit;
Described control module also is used to calculate the average retardation rate MFDD of described first rolling mechanism, and/or described first rolling mechanism is to the damping force of described wheel 6.Described control module specifically adopts industrial computer 15, and industrial computer 15 is by the torque data of detected time data of data collecting card acquisition time detecting unit and detected first rolling mechanism of torque detecting unit.Industrial computer 15 is by these data of online collection, can carry out the research of online in real time to Motor Vehicle Braking Procedure, the real-time slip rate that calculates between described wheel 6 and the described rolling mechanism, and/or the average retardation rate MFDD of described first rolling mechanism, and/or described first rolling mechanism is to the damping force of described wheel 6.The data that industrial computer 15 obtains accurately and timely have very big benefit for the On-line Control automobile brake.And industrial computer 15 not only can collect the detected data of braking ability of traditional hydraulic ABS brake system, and can collect the detected data of braking ability of the abs braking system of brake-by-wire.
Preferably, the device that described automobile brake perfrmance detects also comprises display unit, is used to the data that show that described control module is collected.Display unit specifically adopts display, and various data of industrial computer 15 being collected by display and the various data that calculate are carried out the demonstration of real-time online, can study by online ABS at brake-by-wire.
Preferably, described control module and brake system of car are taked interactive mode work.Control module can in time feed back this braking ability that installs detected brake system of car, and the braking of Control of Automobile brake system.Industrial computer 15 is also controlled the switch of motor 1, the driving of 1 pair of flywheel 2 of control motor, and industrial computer 15 also receives the CAN signal of the vehicle of automobile ECU (electronic control unit) 16 transmissions at any time simultaneously.The analysis of data that can be by various braking abilities that control module is collected, On-line Control brake system of car, and adjust the various parameters of brake system of car, thus optimize parameter in the various braking procedures of brake system of car.
Because automobile exists the stressed difference of two-wheel drive, four-wheel drive and front and back wheel 6, so brake system of car is taked different braking methods for the different wheel 6 of automobile by different brake parameterses is set, the device that this automobile brake perfrmance detects can detect the braking ability of brake system of car for the different wheel 6 of the automobile of simulation.Certainly, also can make the device that four automobile brake perfrmances detect, and it is independent fully between them, four wheels 6 to automobile carry out the automobile brake perfrmance detection respectively, these four detected data of automobile brake perfrmance pick-up unit can be collected by an industrial computer 15, and optimize automobile brake perfrmance by industrial computer 15.The device that this automobile brake perfrmance detects can be developed the research that automobile is manufactured experimently the automobile brake perfrmance the whole process from prototype research, the model machine of automobile.
The device that this automobile brake perfrmance detects can simulated roadway to the damping force of automobile, obtain the automobile brake perfrmance parameter by bench test, improved the precision of the simulation test that bench test travels for automobile on the road surface.This device can be used for carrying out the single-wheel of automobile and the research of braking performance of vehicle, also can carry out vehicle dynamic quality, riding stability experimental study.And this installation cost is low, easily produces, and is convenient to the laboratory and uses, and is beneficial to operating personnel's operation.
Embodiment 2
Present embodiment provides a kind of and uses above-mentioned device to carry out the method that automobile brake perfrmance detects, and may further comprise the steps:
(1) make drive mechanism inertia mechanism kinematic, described inertia mechanism drives first rolling mechanism by first synchronous drive mechanism and rotates, and described first rolling mechanism drives wheel 6 by rubbing contact and rolls.Wherein, inertia mechanism specifically adopts flywheel 2, and driving mechanism specifically adopts concrete concrete first belt 3 that adopts of first rotary drum, 5, the first synchronous drive mechanisms that adopts of motor 1, the first rolling mechanism.Wherein, total moment of inertia of first rotary drum 5, flywheel 2 and motor 1 is identical with the moment of inertia that obtains by the conversion of wheel 6 translation quality of loads.
(2) in the device that this automobile brake perfrmance detects, automobile is simulated travelling of road surface, the rotating speed of setting first rotary drum 5 is equivalent to the speed of a motor vehicle of automobile.As shown in Figure 1, when carrying out the automobile brake perfrmance detection, first rotary drum 5 and flywheel 2 are quickened, accelerate to the automobile brake initial velocity v of testing requirements by motor 1 0, stopping the driving of motor 1 for flywheel 2, this moment, first torque rotary speed sensor 4 recorded the angular velocity omega of first rotary drum 5 D0=v 0/ R d, second speed probe records the angular velocity omega of wheel 6 W0=v 0/ R wWherein, the radius of first rotary drum 5 is R d, the radius of wheel 6 is R wBy ABS wheel 6 is braked, can certainly be adopted the simulating brake system that to study.At this moment, wheel 6 rotating speeds constantly reduce, and it is slow than wheel 6 rotating speeds that first rotary drum 5 and flywheel 2 are reduced by the inertia effect rotating speed, and the rotating speed that records described first rotary drum 5 by first torque rotary speed sensor 4 is ω d,
The speed v of first rotary drum 5 dd* R d, the rotating speed that records described wheel 6 by second speed probe is ω w, the speed of wheel 6 is v ww* R w, the slip rate s that records between wheel described in the braking procedure 6 and described first rotary drum 5 is:
s = v d - v w v d = ω d × R d - ω w × R w ω d × R d
Before wheel 6 was braked, first rotary drum 5 drove wheel 6 by friction force and rotates, and the speed of first rotary drum 5 is identical with the speed of wheel 6.When stopping motor 1 for the driving of flywheel 2, wheel 6 to be braked, this moment, the speed of wheel 6 constantly reduced.Because flywheel 2 has stored energy, the flywheel 2 and first rotary drum 5 are subjected to its rotating speed of inertia effect to reduce slow than wheel 6.After wheel 6 was braked, wheel 6 not only had been subjected to the friction force of first rotary drum 5 for wheel 6 along the tangential direction of its excircle, also had been subjected to the damping force of the ABS of automobile to wheel 6 simultaneously, and this moment, the speed of first rotary drum 5 was different with the speed of wheel 6.As shown in Figure 1, when motor 1 drives flywheel 2 rotations, the rotor of motor 1 turns clockwise, motor 1 drives flywheel 2 by shaft coupling 8 and turns clockwise, flywheel 2 drives first rotary drum 5 and turns clockwise by being enclosed within first belt, 3 transmissions on it, and the friction force of first rotary drum 5 by 5 pairs of wheels 6 of first rotary drum drives wheel 6 and is rotated counterclockwise.When ABS braked wheel 6, ABS was counterclockwise to the torque direction of wheel 6.
(3) speed when described first rolling mechanism arrives 0.8v 0The time, pick up counting by the time detecting unit, reach 0.1v up to the speed that detects described first rolling mechanism 0The time stop timing, the displacement of described rolling mechanism is S in calculating during this period of time, calculates the average retardation rate MFDD of described rolling mechanism:
MFDD=[(0.8v 02-(0.1v 0) 2]/(25.92×S)
(4) torque that records described first rolling mechanism by the torque detecting unit is T r, the radius of described first rolling mechanism is R r, the damping force of described first rolling mechanism to described wheel 6 converts.As shown in Figure 1, when with wheel 6 carry out rubbing contact first rotary drum 5 is only arranged the time, described first rolling mechanism is F to the damping force of described wheel 6 r=T r/ R rAs shown in Figure 2, when carrying out first rotary drum 5 of rubbing contact and second rotary drum 12 with wheel 6, and the specification of two rotary drums is the same, and first rotary drum 5 is in transmission connection by first belt 3 with flywheel 2, the axle that this first belt 3 is enclosed within first rotary drum, 5 one ends go up and the axle of flywheel 2 on; Be in transmission connection by second belt 14 at first rotary drum 5 and second rotary drum 12, the axle that this second belt 14 is socketed in first rotary drum, 5 other ends go up and the axle of second rotary drum 12 on, first rotary drum 5 and second rotary drum 12 are installed on the drum iron 13.When using this device to carry out the automobile brake perfrmance detection, by being fixed between two rotary drums, wheel 6 detects, and the central shaft of the central shaft of wheel 6 and two rotary drums is parallel to each other.At this moment, the torque detecting unit records wherein that the torque of first rotary drum 5 is 2T r', the torque of second rotary drum 12 also is 2T so r', the torque that 5 pairs of wheels 6 of first rotary drum apply is T r', the damping force F of 5 pairs of wheels 6 of first rotary drum r'=T r'/R r, the damping force of 12 pairs of wheels 6 of second rotary drum also is F r'=T r'/R r, wherein, the radius of first rotary drum 5 and second rotary drum 12 is Rr.
As shown in Figure 1, in the device that this automobile brake perfrmance detects, automobile is simulated travelling of road surface, set first rotary drum 5 and be equivalent to the damping force of road surface for wheel 6 for the damping force of wheel 6.When wheel 6 was braked, wheel 6 was subjected to the retarding torque T of ABS for wheel 6 bFirst rotary drum 5 is subjected to the damping force F of 6 pairs first rotary drums 5 of wheel x, the damping force F of 6 pairs first rotary drums 5 of wheel xFirst rotary drum 5, flywheel 2 and motor 1 are slowed down together.When first rotary drum, 5 rotating speeds reach v 0Stop driving to motor 1, and after wheel 6 is braked, the moment of inertia of flywheel 2 makes first rotary drum 5, flywheel 2 and the total moment of inertia of motor 1 rotor equate with the moment of inertia that obtains that converts by wheel 6 translation quality of loads, therefore thereby make flywheel 2 systems and vehicle translation have the inertia effect that is equal to, the moment of torsion that records by the first torque rotary speed sensor 4 damping force F of 6 pairs first rotary drums 5 of wheel that obtain that converts xSuitable with wheel 6 road surface actual braking forces.In braking procedure,, can test the abs braking performance by real-time measurement slip rate and damping force.During to wheel 6 brakings, the kinetics equation of wheel 6:
I wω w=F xR w-T b
Wherein, F xBe the damping force of 6 pairs first rotary drums 5 of wheel, R wBe the radius of wheel 6, I wBe the moment of inertia of wheel 6, ω wBe the angular acceleration of wheel 6, T bBe the retarding torque of ABS for wheel 6.
First rotary drum 5 acts on the damping force F of 6 pairs first rotary drums 5 of wheel among damping force direction on the wheel 6 and Fig. 1 xDirection opposite.During to wheel 6 brakings, first rotary drum 5, flywheel 2, motor 1 rotor dynamics equation:
T e-F xR d=I dω d+I fω f+I eω e
Wherein, I dBe first rotary drum, 5 moment of inertia, I fBe flywheel 2 moment of inertia, I eBe motor 1 moment of inertia, ω dBe the angular acceleration of first rotary drum 5, ω fBe the angular acceleration of flywheel 2, ω eBe the angular acceleration of motor 1, T eBe motor 1 effect torque, other parameter is the same.As can be seen, the method that this automobile brake perfrmance detects has been simulated automobile travelling on the road surface accurately from the kinetics equation of the kinetics equation of above-mentioned wheel 6 and motor 1 rotor, has recorded the parameter of reaction automobile brake perfrmance.
At the device of above-mentioned use automobile brake perfrmance detection, and use the method for above-mentioned automobile brake perfrmance detection to carry out in the automobile brake perfrmance testing process, can test the braking ability of ABS by increasing the heavy burden of wheel; The material that also can be by changing first rotary drum, 5 surfaces and/or the material (because the friction force difference between the different materials selects the material on first rotary drum, 5 surfaces and/or the material of wheel 6 to be equivalent to simulate the different friction force on different road surfaces) of wheel 6 are tested the braking ability of ABS.
As shown in Figure 3, enumerated the various parameters of the automobile brake perfrmance of the method acquisition of using this automobile brake perfrmance detection, can be implemented in the monitoring of line automobile brake perfrmance.
Be understandable that above embodiment only is the illustrative embodiments that adopts for principle of the present invention is described, yet the present invention is not limited thereto.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 also are considered as protection scope of the present invention.

Claims (11)

1. the device that detects of an automobile brake perfrmance is characterized in that, comprises inertia mechanism, drives the driving mechanism that described inertia mechanism rotates, with first rolling mechanism of wheel rubbing contact, and first rotation speed detection unit, and second rotation speed detection unit; Wherein, described first rolling mechanism is connected by first synchronous drive mechanism with described inertia mechanism, and described first rotation speed detection unit is used to detect the rotating speed of described first rolling mechanism, and described second rotation speed detection unit is used to detect the rotating speed of described wheel.
2. the device that automobile brake perfrmance according to claim 1 detects is characterized in that, total moment of inertia of described driving mechanism, inertia mechanism and first rolling mechanism equates with the moment of inertia that obtains that converts by described wheel translation quality of loads.
3. the device that automobile brake perfrmance according to claim 1 detects is characterized 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 the described wheel.
4. the device that automobile brake perfrmance according to claim 1 detects is characterized in that, also includes heavy burden mechanism, and described heavy burden mechanism is arranged on the wheel with the described first rolling mechanism rubbing contact.
5. the device that automobile brake perfrmance according to claim 1 detects, it is characterized in that, also comprise second rolling mechanism, described second rolling mechanism is connected by second synchronous drive mechanism with described first rolling mechanism, described first rolling mechanism and second rolling mechanism all with described wheel rubbing contact.
6. the device that automobile brake perfrmance according to claim 1 detects, it is characterized in that, also comprise control module, described control module is used to collect the rotary speed data of detected described first rolling mechanism of described first rotation speed detection unit and the rotary speed data of the detected described wheel of described second rotation speed detection unit
Described control module is also controlled the start and stop of described driving mechanism, and calculates the slip rate between described wheel and the described rolling mechanism.
7. the device that automobile brake perfrmance according to claim 6 detects, it is characterized in that, also comprise the time detecting unit, and/or the torque detecting unit that is provided with on described first rolling mechanism, wherein, described time detecting unit is used to detect the rolling time of described first rolling mechanism, and described torque detecting unit is used to detect the torque of described first rolling mechanism.
8. the device that automobile brake perfrmance according to claim 7 detects is characterized in that described control module also is used to collect the detected time data in described time detecting unit; And/or the torque data that is used to collect detected described first rolling mechanism of described torque detecting unit;
Described control module also is used to calculate the average retardation rate MFDD of described first rolling mechanism, and/or described first rolling mechanism is to the damping force of described wheel.
9. use any described device of claim 1~8 to carry out the method that automobile brake perfrmance detects, it is characterized in that, may further comprise the steps:
Make drive mechanism inertia mechanism kinematic, described inertia mechanism drives first rolling mechanism by first synchronous drive mechanism and rotates, and described first rolling mechanism drives wheel rolling by rubbing contact;
When the speed that detects described first rolling mechanism by first rotation speed detection unit reaches automobile brake initial velocity v 0The time, stop of the driving of described driving mechanism for described inertia mechanism, simultaneously described wheel is braked;
The speed of setting described first rolling mechanism is the speed of a motor vehicle of automobile, and the rotating speed that records described first rolling mechanism by first rotation speed detection unit is ω d, the speed v of first rolling mechanism dd* R d, the rotating speed that records described wheel by second rotation speed detection unit is ω w, the speed of wheel is v ww* R w, the slip rate s that records between wheel described in the braking procedure and the described rolling mechanism is:
s = v d - v w v d = ω d × R d - ω w × R w ω d × R d
10. the method that automobile brake perfrmance according to claim 9 detects is characterized in that, and is further comprising the steps of: in carrying out the automobile brake perfrmance testing process, use claim 7 or 8 described devices,
Speed arrival 0.8v when described first rolling mechanism 0The time, pick up counting by the time detecting unit, reach 0.1v up to the speed that detects described first rolling mechanism 0The time stop timing, the displacement of described first rolling mechanism is S in calculating during this period of time, calculates the average retardation rate MFDD of described first rolling mechanism:
MFDD=[(0.8v 02-(0.1v 0) 2]/(25.92×S)。
11. the method that automobile brake perfrmance according to claim 9 detects is characterized in that, and is further comprising the steps of: in carrying out the automobile brake perfrmance testing process,
The torque that records described first rolling mechanism by the torque detecting unit is T r, the radius of described first rolling mechanism is R r, the damping force of described first rolling mechanism to described wheel converts.
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