CN1648631A - Test table of automobile braking ABS based on brake inertia test - Google Patents
Test table of automobile braking ABS based on brake inertia test Download PDFInfo
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- CN1648631A CN1648631A CN 200410046011 CN200410046011A CN1648631A CN 1648631 A CN1648631 A CN 1648631A CN 200410046011 CN200410046011 CN 200410046011 CN 200410046011 A CN200410046011 A CN 200410046011A CN 1648631 A CN1648631 A CN 1648631A
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Abstract
The automobile braking ABS test table mainly a includes drive motor and its control mechanism, a main shaft, an inertial flywheel and its hanging mechanism, a skid platform, a gear box and gimbal, a roller and guide rail, a tested wheel-roller normal pressure loading unit and a regulating mechanism, a tested wheel-roller side pressure loading unit and a regulating mechanism, a wheel cylinder braking pressure switching mechanism, a speed and force sensing unit, a hydraulic pump station, a temperature regulator, an emergency brake, a control cabinet, a data recording, a processing, displaying and printing unit and frame and a protecting hood. During ABS test, the main driving motor drives the driving box, the gimbal and the driving shaft through the main shaft to drive the roller, the roller drives the wheels and the main shaft also drives the flywheel. In conventional brake performance test, the main driving motor drives the flywheel and the brake only via the main shaft.
Description
Affiliated technical field
The present invention relates to automotive anti-lock braking device experiment table, especially a kind of automotive anti-lock braking device experiment table (being called for short the ABS experiment table) based on the detent inertia test.
Background technology
At present, domestic and international existing automotive brake inertia experiment table manufacturer is more famous U.S. Link company and a Greening company, German Schenck company, non-ore deposit technical equipment research institute of Jilin University.Automotive brake inertia experiment table is used for the Performance Detection and the research of automotive brake product, can carry out all traditional performance tests of automotive brake.
At present, the technology status of domestic ABS experiment table is zero, and external existing automobile ABS experiment table can be divided into four classes:
One class is to only limit to experiment table that the electronics in the ABS device and electrical appliance part are carried out performance test, it is made up of signal generation apparatus, oscillograph, ABS electric control gear, abs pressure regulator, vibration environment analogue means and electromagnetic interference environment analogue means, only the performance of the input and output signal of the ECU (Electrical Control Unit) of ABS is tested.
Its advantage is:
1) can test the rationality of hardware circuit design in the ECU (Electrical Control Unit) more all sidedly;
2) but the rationality of data acquisition software design in the basic test ECU (Electrical Control Unit);
3) can test the rationality of solenoid valve and motor drive signal design in the ECU (Electrical Control Unit) more all sidedly;
4) by simulating ECU (Electrical Control Unit), can test the environmental suitability of ECU (Electrical Control Unit) at the automobile actual vibration environment that runs into and electromagnetic interference environment in the utilization process.
Its shortcoming is:
1) machine assembly performance in the automobile ABS device and hydraulic pressure unit performance are not tested, existed the test that is not towards whole ABS device, can not full test ABS device performance;
The problem of ECU (Electrical Control Unit), machine assembly and hydraulic pressure unit Performance Match that 2) can not full test ABS;
When 3) data acquisition software is tested in carrying out ECU (Electrical Control Unit), the input signal of ECU (Electrical Control Unit) is the wheel speed signal that produces with instrument, the wheel speed signal of gathering in this and the real vehicle utilization process has very big difference, thereby can not test the rationality of data acquisition software design in the ECU (Electrical Control Unit) all sidedly.
Another kind of is the experiment table that utilization hardware-in-the-loop simulation (Hardware-in-the-Loop) method is carried out the test of automobile ABS device performance.The abs braking system of automobile is made up of material object, and the other parts of vehicle and running environment are realized by the automobile dynamics model that is based upon in the computing machine, by the performance of semi-physical real-time simulation method examination ABS device.
Its advantage is:
1) have the dirigibility of ABS performance test, by changing the in kind and automobile dynamics model parameter of abs braking system, but flexible Application is in different automobile types;
2) by the input brake duty parameter, can simulate various damped conditions flexibly;
3) better in indoor l-G simulation test condition, process of the test safety, time weak point;
4) the research and development cost is lower.
Its shortcoming is:
1) setting up the required a lot of parameters of vehicle dynamic model needs a lot of real train tests to obtain;
2) setting up the required a lot of parameters of road surface adhesion property model needs a lot of real train tests to obtain;
3) vehicle dynamic model still is difficult to set up accurately, the levels of precision that vehicle dynamic model is set up has determined the accuracy to the ABS performance test, can't satisfy the requirement of accurate modeling as tire model in the existing auto model and suspension system model, thereby the hardware-in-the-loop simulation method there is certain error to performance test and the real vehicle ABS performance test of ABS;
The emulation of 4) car brakeing process and real vehicle road traveling braking procedure have certain difference, can not replace real vehicle ABS performance test.
A class is a real vehicle ABS experiment table again, and it is made up of four master rotors, four auxiliary cylinders, two lifting jacks, six electromagnetic clutchs, four master rotor speed probes, four auxiliary cylinder speed probes, four inertial flywheels, a belt driver and a motor.During the performance of ABS test, each is supported each wheel of tested automobile by a master rotor and an auxiliary cylinder.Each is measured the wheel speed of four wheels by the auxiliary cylinder speed probe of its supporting, and the speed of automobile is measured by the master rotor speed probe.
The advantage of this type of experiment table is:
1) can carry out real vehicle examination to a part of performance of ABS, but as simulation test ABS on the face of straight way main line and the braking control performance on the wet road surface of straight way;
2) can test the matching performance of ECU (Electrical Control Unit), machine assembly and the hydraulic pressure unit of ABS;
3) with real vehicle road traveling braking procedure basically identical;
4) compare with the examination of real vehicle ABS road, the research and development cost is lower;
5) in case the ABS device is debugged successfully on this type of experiment table, the actual road test of ABS device is much easier.
Its shortcoming is:
1) owing to the restriction of such experiment table motor power (output) and driving-belt, the max. speed that can test is lower, can not realize the high speed performance examination to the ABS device, and this performance examination to the ABS device is not enough;
2) owing to the restriction of belt driver, the wheelbase of the tested automobile that this experiment table adapts to is 2.35～2.85m, can only adapt to the car test, and for other light bus and lorry, the wheelbase of adaptation can not meet the demands; Medium-sized and heavy vehicle for other, the wheelbase of the load-bearing capacity of such experiment table, cylinder number and layout thereof, adaptation all can not meet the demands;
3) moment of inertia of four inertial flywheels is fixed, and can not adapt to the performance test requirement of the car ABS device of different complete vehicle qualities;
4) dissimilar cars drive the pattern difference, the height of center of mass difference, the axle load difference, the severity of braking difference, thereby the ratio difference of the dynamic normal load of bridge before and after when braking, the ratio of this experiment table normal load is fixed, the ABS performance test of the car of bridge Different Dynamic normal load before and after can not simulating;
5) for adhering to even road surface, can only simulate the two kinds of situations in main line face and wet road surface, can not simulate the low road surface situations of adhering to such as snow road surface, ice road surface;
6) for to open circuit surface, can only simulate main line face-wet road surface situation, the high/low attachment coefficient on road surface, both sides is very approaching, can not react ABS to the control performance on the open circuit surface;
7) simulation real vehicle ABS will be to four master rotors and four auxiliary cylinder water sprays when the performance situation on wet road surface, and the interaction of wheel and cylinder during braking can make that spray splashes, and influences the operate as normal of the driving-belt and the electrical equipment of experiment table;
8) under wet road surface test operating mode, with the wheel speed of auxiliary cylinder speed as wheel, because the existence of wheel slip, error is bigger;
9) no matter which kind of test operating mode uses master rotor speed as the speed of a motor vehicle, because the existence of wheel slip, error is bigger;
10) four real-time four speed of a motor vehicle that obtain of master rotor are not the same, and often error is bigger, cause actual vehicle speed to be difficult for accurately determining;
11) the experiment table servicing unit is more, is equipped with the lifting jack lifting with power source etc. as needs;
12) during wheel braking, tested vehicle has the danger of rolling experiment table away from, and certain experimental safe hidden danger is arranged.
Also having a class is that the ABS experiment table of producing with German Schenck company is representative, is used for automobile on the automobile assembly line ABS device performance test experience platform that rolls off the production line.It mainly is made up of four cylinders and drive motor separately thereof, two lifting jacks, vehicle stop means, signal sensors.During the performance of ABS test, each is supported each wheel of tested automobile by a master rotor and an auxiliary cylinder.Each is measured the wheel speed of four wheels by the auxiliary cylinder speed probe of its supporting, and the speed of a motor vehicle is measured by the master rotor speed probe.
Its advantage is:
1) conformity of production that can be advantageously used in the ABS device is checked;
2) can take into account the detection of automobile braking force;
3) can take into account the detection of automobile dynamic quality;
4) operating condition method that can take into account the motor vehicle emission performance detects.
Its shortcoming is:
1) can only simply assess performance that can not full test ABS device to the assembling effect of ABS device;
2) can not be used for the performance study and the exploitation of ABS device;
3) the experiment table servicing unit is more;
4) cost is higher.
Summary of the invention
On the basis of automotive brake inertia experiment table, by repacking, increase ABS performance test function, form automotive anti-lock braking device performance experiment table based on the detent inertia test.It is by main drive motor and control gear thereof, main shaft, one group of inertial flywheel and hanging mechanisms thereof, slide unit and position-limit mechanism thereof, transmission case, transmission shaft and universal joint, cylinder and moving guide rail thereof, normal pressure charger and pressure servo governor motion between tested wheel and the cylinder, side force charger and pressure servo governor motion between tested wheel and the cylinder, wheel cylinder brake pressure switching mechanism, rate signal and force signal sensing device, hydraulic power unit, temperature control equipment, emergency braking apparatus, switch board, data recording/processing/demonstration/printing equipment, frame and protective cover are formed.The ABS experiment table can carry out the ABS performance test, can carry out the traditional performance test of detent again, is the multifunction test device of brake system of car.
The technical solution adopted for the present invention to solve the technical problems is:
1) the ABS experiment table is contained in tested wheel and detent thereof on the slide unit for realizing ABS performance test function.Main drive motor drives main shaft and rotates, and draws power from the main shaft of ABS experiment table, successively reaches transmission case, universal joint and drive shaft, drives cylinder and rotates, the wheel of drum driven on it.Main shaft drives the inertial flywheel rotation of simulation wheel normal load simultaneously in addition.Reach the preset vehicle speed of ABS performance test when drum rotation speed after, the main drive motor power down, abs controller is implemented the pressure of braking supercharging, braking decompression or service lap and is regulated according to the steering logic of ABS to tested wheel simultaneously, realizes the ABS control brake of wheel.Friction force between wheel and the cylinder is slowed down cylinder and is rotated, the situation of change of the speed of a motor vehicle in the simulated automotive braking procedure, the wheel speed situation of change of tested wheel make braking moment that wheel decelerates rotates and the wheel that makes that friction force produced between wheel and the cylinder quicken the moment acting in conjunction decision of rotating by wheel drag produced.Be installed in the directly real-time tach signal of measuring wheel of speed probe on the tested wheel, be installed in the directly real-time tach signal of measuring cylinder of speed probe on the main shaft, be vehicle speed signal.Tach signal and vehicle speed signal reach the electronic-controlled installation (ABS ECU) of ABS, are used for calculating in real time the angular deceleration/angular acceleration of tested wheel and the slip rate of wheel.The cylinder that drive wheels is rotated can move up and down along guide rail, is used for regulating the normal pressure between cylinder and wheel.The size of this normal pressure is by force sensor measuring.After normal pressure pre-sets, automatically regulate the oil pressure of oil cylinder by the Hydrauservo System of the two-way cylinder that cylinder is moved up and down, until making the normal pressure between cylinder and wheel be stabilized in the value of setting in advance, realize the simulation of the different adhesion properties that different road surface produces, be used to test the control performance of ABS on different road surfaces.Be installed in and make slide unit in another two-way cylinder of slide unit end, make to produce side force between cylinder and wheel along the moving axially of main shaft.The size that produces side force is by force sensor measuring, after the size of this side force pre-sets, Hydrauservo System by this two-way cylinder is regulated automatically, until making the side force between cylinder and wheel be stabilized in the value of setting in advance, is used for the control performance test of ABS under steering state.
2) when the traditional performance test of carrying out vehicle brake, only the vehicle brake assembly is contained on the slide unit of experiment table, brake assembly and cylinder disengage, and transmission case is in neutral position, cut off the power between experiment table main shaft and the cylinder like this, cylinder no longer rotates.Main drive motor drive shaft and the rotating part that drives brake assembly rotate.The moment of inertia of the inertial flywheel that the size adjustment of the normal load of bearing according to the wheel of using this detent is rotated with main shaft is used for simulating the normal load that wheel is born.During test, after the rotating part of main shaft drive brake assembly rotates the rotating speed that reaches predetermined, tested detent is applied constant pressure/permanent moment of torsion braking, detect every traditional performance of detent.
Feature based on the automotive anti-lock braking device experiment table of detent inertia test is: whole ABS experiment table is laid on the ground, and tested wheel or brake assembly mounting or dismounting position make things convenient for laboratory technician's operation; Experiment table has the one-piece steel frame, is made by the high torsional resistance steel, and removes internal stress by advanced Technology for Heating Processing, and the frame upper surface is that drive motor is installed, transmission case, and main shaft, the basal plane of flywheel system and bearing seat thereof and slide unit, unification is located by keyway; Main drive motor is a direct current motor, adopts the DC speed regulation mode, is suitable for the test of ABS performance test and detent traditional performance; The I axle of transmission case is a power input shaft, it is the part of ABS experiment table main shaft, the II axle is an intermediate shaft, it is passing to the III axle from the power of I axle, the III axle is a power output shaft, through torque sensor, universal joint and drive shaft connects with cylinder, the ratio of gear of transmission case is 1: 1, gear on the II axle can move axially, the joint of realizing III axle and I axle with separate, this clutch action pushes away/draws realization by an oil cylinder, when being used for the ABS performance test, the III axle of transmission case engages with the power of I axle, and the III axle separates with the power of I axle when being used for the test of detent traditional performance; Inertial flywheel system is made up of 10 flywheels, be divided into two groups by geometric ratio and equal difference, one group of the geometric ratio distribution is little mass flywheel, adopt flange and Bolt Connection, support is fixed, and one group of the equal difference distribution is big mass flywheel, adopts conical surface location, by flywheel outer bolt, effectively shortened axial length; Slide unit can move axially and locking in position; When being used for the ABS performance test, slide unit can move axially to realize axial loading in pushing away/leaving behind of a servo-cylinder, axial load can be by set point adjustment, slide unit rotation axis end is a removable connector, axletree when being used for fixing the tumbler of detent or ABS test has caliper/back-plate fixed mechanism on the slide unit; Idler is on two rolling bearings, bearing seat is fixed on the rigid carriers, carriage is installed on the rolling guide, but promotion bottom bracket VTOL (vertical take off and landing) at a servo-cylinder, make between cylinder and the wheel and produce normal pressure, but this normal pressure FEEDBACK CONTROL, idler bearing and rolling guide can also bear the cylinder axial thrust; Accident brake is installed on the main shaft of ABS experiment table, and except that emergency braking function, its brake pressure is adjustable, can realize the adjusting of cylinder rotational resistance torque; On the pipeline that pressure of wheel cylinder is supplied with, has an X-over, when carrying out the ABS performance test, pressure oil through the abs pressure regulator again to the wheel cylinder fuel feeding of tested wheel, realize the adjusting of wheel-braking cylinder pressure, carry out detent traditional performance when test, pressure oil without the abs pressure regulator directly to the wheel-braking cylinder fuel feeding; Hydraulic power unit places main drive motor below, for the action of each oil cylinder provides power; The sensor that the ABS experiment table possesses has: be used to test the force transducer of brake braking force square, be installed on the rotation axis in the slide unit; Be used to test the torque sensor of cylinder moment, be installed on the transmission shaft between transmission case and the cylinder; The speed probe that is used for the test carriage wheel speed is installed on the slide unit rotation axis; Be used to test the speed pickup of main shaft and drum rotation speed, be installed on the main shaft; The force transducer that is used for the testing tire side force is installed in the inner end that makes the axially movable servo-cylinder of slide unit; Be used to test the force transducer of normal pressure between cylinder and wheel, be installed in the below of idler carriage; Be used to test the pressure transducer of detent brake-pipe pressure, be installed in the brake piping of detent; Be used to test the pressure transducer of main shaft accident brake brake-pipe pressure, be installed in the brake piping of main shaft accident brake; Be used to test 4 temperature sensors of brake temperature, wherein 2 temperature sensors are installed on the fixture of detent, and other 2 temperature sensors are installed on the tumbler of detent, by being installed in the collector ring output on the main shaft; Computer automatic control system has adopted multitask, multi-user's VME real-time control computer and the PC of Windows NT, the test reliability and the real-time of height have been guaranteed, make the user have friendly Windows operation interface, have diagnosis, analysis and the Presentation Function from normal moveout correction and demarcation, most common failure of the control of ABS performance test, detent traditional performance test control, experiment table each several part.
The invention has the beneficial effects as follows:
A kind of novel automotive anti-lock braking device performance experiment table based on the detent inertia test is provided, can carry out the various traditional performance tests of automotive brake, can carry out the performance test of automotive anti-lock braking device again, to adapt to the extensively needs of the braking performance test of the brake anti-lock device of installation of Hyundai Motor; For existing automotive brake inertia experiment table, can transform by simple, can increase the ABS test function, reach the potentiality that make full use of existing automotive brake inertia experiment table, improve the utilization factor of existing automotive brake inertia experiment table, adapt to the requirement of Hyundai Motor clamping device test.
Can carry out the performance of ABS pilot project has:
(1) can carry out the performance test of ABS on the straight way road surface of various adhesion properties, as dry cement road surface, dried bituminous pavement, rain road surface pavement, wetlaid road surface, loose snow road surface, compacting snow road surface, the ice road surface is melted, macadam pavement in the dry ice road surface;
(2) can carry out the performance test of ABS on the curved road surface of various adhesion properties, as the dry cement road surface, dried bituminous pavement, the rain road surface pavement, the wetlaid road surface, loose snow road surface, compacting snow road surface, the ice road surface is melted, macadam pavement in the dry ice road surface;
(3) can carry out the performance test of ABS under different speed of a motor vehicle states, as the low speed of a motor vehicle, the medium speed of a motor vehicle, the high speed of a motor vehicle;
(4) can carry out the performance test of ABS under different normal load states, as zero load, semi-load, fully loaded;
(5) can carry out the performance test of ABS under the tire of the different degrees of wear, as new tire, half new tire, old tire;
(6) can carry out the performance test of ABS under driver's different operation modes, brake as high strength, the medium tenacity braking, low-intensity braking, clutch coupling are in conjunction with braking, and clutch coupling is braking separately, slowly braking after elder generation's brake hard, braking back brake hard earlier slowly, earlier slowly after braking, of short duration the loosening the brake again slowly/brake hard, after first brake hard, of short duration the loosening the brake again slowly/brake hard;
(7) can carry out the performance test of ABS under different ramps, as different uphill gradients, different downward grades;
(8) can carry out ABS in the performance test of butt joint on the road surface, adhere to-hang down as height and adhere to the road surface, low adhering to-Gao adheres to the road surface, and height adheres to-hang down and adhere to-Gao adheres to the road surface, hang down to adhere to-Gao adheres to-hangs down and adhere to the road surface;
(9) can carry out ABS on various road surfaces, different kinds of roads trend, the various gradients, various speed, various load, the test of the various combination of various braking modes;
(10) can carry out automobile when straight way travels, various adhering to braked adhesion property-slip rate relation test on the road surface;
(11) can carry out automobile when travelling on different bends, various adhering to braked adhesion property-slip rate relation test on the road surface.
The traditional performance pilot project that can carry out vehicle brake has:
(1) has detent constant force square (permanent output) test function;
(2) has detent constant pressure (permanent input) test function;
(3) has the detent performance test function of dawdling;
(4) has statical moment (containing hand braking) test function;
(5) lag performance (Brake Hysteresis) that can carry out detent is tested;
(6) the pressure initiation performance (Threshold Pressure) that can carry out detent is tested;
(7) the relief pressure performance (Release Pressure) that can carry out detent is tested;
(8) the gradual pressure performance (Asymptotic Pressure) that can carry out detent is tested;
(9) the residual performance of braking moment (Brake Drag) that can carry out detent is tested;
(10) the bright film properties of friction facing (Lining Glazing) that can carry out detent is tested;
(11) the heat fading performance (Heat Fade) that can carry out detent is tested;
(12) the water fade performance (Water Fade) that can carry out detent is tested;
(13) restorability (Recovery) that can carry out detent is tested;
(14) the cold braking sickness performance (Cold Brake Sickness) that can carry out detent is tested;
(15) application factor (Brake Factor) that can carry out detent is tested;
(16) the chatter performance (Brake Chatter) that can carry out detent is tested;
(17) can carry out detent brake oil (Brake Noise) test;
(18) can carry out China, Europe, the U.S., Japanese car detent test standard.
Description of drawings
The present invention is further described below in conjunction with drawings and Examples.
Automotive anti-lock braking device performance experiment table master TV structure figure when Fig. 1 is the ABS performance test.
Automotive anti-lock braking device performance experiment table plan structure figure when Fig. 2 is the ABS performance test.
When Fig. 3 is the ABS performance test and detent traditional performance when test automotive anti-lock braking device performance experiment table side-looking structural drawing.
Automotive anti-lock braking device performance experiment table master TV structure figure when Fig. 4 tests for brake performance.
Automotive anti-lock braking device performance experiment table plan structure figure when Fig. 5 tests for brake performance.
1. frames among the figure, 2. main drive motor, 3. hood, 4. speed of mainshaft sensor, 5. emergency braking mechanism, 6. transmission case, 7. main shaft, 8. statical moment calibrating device, 9. flywheel group hanging mechanisms, 10. flywheel group, 11. tested wheels, 12. tested wheel fixed supports, 13. wheel speed sensor, 14. slide units, 15. cooling channel mechanisms, 16. wheel torque sensor, 17. servo-cylinders, 18. lateral force sensors, 19. cylinder, 20. pressure sensors, 21. servo-cylinders, 22. guide rail, 23. universal joint, 24. transmission shafts, 25. cardan-shaft suspension mechanisms, 26. cylinder torque sensor, 27. the transmission case gear shifting handle, 28. hydraulic power units, 29. supports, 30. the detent pitman shaft, 31. tested detents.
Embodiment
At Fig. 1, among Fig. 2 and Fig. 3, before carrying out the test of ABS performance test or detent traditional performance, by statical moment calibrating device (8) wheel torque sensor (16) and cylinder torque sensor (26) are carried out the moment demarcation earlier, by external rated rotational frequency meter speed of mainshaft sensor (4) and wheel speed sensor (13) are carried out the rotating speed demarcation, by external standard pressure transducer side direction force transducer (18) and pressure sensor (20) are carried out pressure calibration, after each transducer calibration is calibrated, can carry out performance of ABS test or the test of detent traditional performance.
In Fig. 1, Fig. 2 and Fig. 3, when carrying out the ABS performance test, promote transmission case gear shifting handle (27) by transmission case clutch oil cylinder and make the slide gear of the II axle of transmission case (6) be in binding site, make and pass to III axle (output shaft) from the kinetic force of transmission case I axle (input shaft); Oil pressure by servo-cylinder (21) makes cylinder (19) move upward along its guide rail (22), until contacting with tested wheel (11), make cylinder (19) and tested wheel (11) keep predefined normal pressure by the oil pressure of regulating servo-cylinder (21), the value of normal pressure reaches main control computer by pressure sensor (20); Moving axially slide unit (14) to appropriate location makes tested wheel (11) can properly be installed on the tested wheel fixed support (12), the side force of regulating tested wheel (11) by servo-cylinder (17), keep predefined value until this side force, the value of side force reaches main control computer by lateral force sensors (18); The size of the normal load of being born according to tested wheel (11), regulate the flywheel group (10) of rotating by flywheel group hanging mechanisms (9), make that the moment of inertia of the flywheel group (10) of rotating with main shaft (7) and normal load that tested wheel (11) is born are suitable with main shaft (7).
After the preliminary work of above-mentioned ABS performance test is finished, start main drive motor (2), main drive motor (2) drive main shaft (7) and be installed in the speed of mainshaft sensor (4) on the main shaft (7), the tumbler and the flywheel group (10) of emergency braking mechanism (5) rotated together, the inner shaft system, cylinder torque sensor (26), universal joint (23), transmission shaft (24) and the cylinder (19) that drive transmission case (6) simultaneously rotate together; Cylinder (19) drives tested wheel (11) and rotates, after the speed of a motor vehicle of speed of mainshaft sensor (4) indication reaches the test speed of a motor vehicle, close main drive motor (2), simultaneously tested wheel (11) is applied abs braking, produced friction force between cylinder (19) and the tested wheel (11) like this; The friction force that acts on the tested wheel (11) has produced the moment that tested wheel (11) is rotated, and it interacts with the rotational resistance torque that applies the abs braking generation, makes wheel rotate with certain angular deceleration/angular acceleration; The friction force that acts on the cylinder (19) has produced the moment of resistance that cylinder (19) is rotated, and makes cylinder (19) and coupled flywheel group (10) do the rotation of slowing down together; Main control computer is gathered the signal (vehicle speed signal) of speed of mainshaft sensor (4) and the signal (wheel speed signal) of wheel speed sensor (13) in real time, vehicle speed signal and wheel speed signal according to real-time collection, calculate the slip rate of wheel and the angular deceleration/angular acceleration of wheel in real time, thereby the motion state of control wheel, the control effect of check ABS.
The required pressure oil of abs braking is provided by hydraulic power unit (28).
Cooling channel mechanism (15) is used for the ventilation and heat of tested wheel (11) and detent thereof.
In case the ABS experiment table fortuitous event occurs in ABS performance test process when needing brake hard, start emergency braking mechanism (5), main shaft (7) is promptly stopped operating, the required pressure oil of emergency braking mechanism (5) is provided by hydraulic power unit (28).
In Fig. 4, Fig. 5 and Fig. 3, when carrying out automobile conventional brake device performance test, promoting transmission case gear shifting handle (27) by transmission case clutch oil cylinder makes the slide gear of the II axle of transmission case (6) be in the separation point position, make and can not pass to III axle (output shaft) from the power of transmission case I axle (input shaft), the inner shaft of transmission case (6) system, cylinder torque sensor (26), universal joint (23), transmission shaft (24) and cylinder (19) no longer rotate like this; Install tested detent (31) by tested wheel fixed support (12); By detent pitman shaft (30) main shaft (7) and tested detent (31) are linked together, main shaft (7) can drive tested detent (31) and rotates together like this; The size of the normal load of bearing according to the applied wheel of tested detent (31), regulate the flywheel group (10) of rotating by flywheel group hanging mechanisms (9), make that the moment of inertia of the flywheel group (10) of rotating with main shaft (7) and normal load that the applied wheel of tested detent (31) is born are suitable with main shaft (7).
After the preliminary work of above-mentioned automotive brake traditional performance test is finished, start main drive motor (2), the tumbler that main drive motor (2) drives main shaft (7) and is installed in tumbler, flywheel group (10), detent pitman shaft (30) and the tested detent (31) of speed of mainshaft sensor (4) on the main shaft (7), emergency braking mechanism (5) rotates together; Carrying out detent constant force square (permanent output), detent constant pressure (permanent input), during the test of item such as detent statical moment (containing hand braking), after the speed of a motor vehicle of speed of mainshaft sensor (4) indication reaches the test speed of a motor vehicle, close main drive motor (2), simultaneously tested detent (31) is applied correspondingly braking, can carry out the lag performance of detent, the pressure initiation performance, the relief pressure performance, the gradual pressure performance, the residual performance of braking moment, the bright film properties of friction facing, the heat fading performance, the water fade performance, hot restorability, the water restorability, the cold braking sickness performance, the chatter performance, the application factor test of brake oil and detent.
Carrying out the dawdling during performance test of detent, after the speed of a motor vehicle of speed of mainshaft sensor (4) indication reaches the test speed of a motor vehicle, tested detent (31) is applied constant force square or constant pressure, the tumbler that main drive motor (2) drives tested detent (31) rotates under on-position, realizes the performance test of dawdling of detent.
Main control computer is gathered the tach signal of speed of mainshaft sensor (4) and the torque signal of wheel torque sensor (16) in real time.
The required pressure oil of detent traditional performance test is provided by hydraulic power unit (28).
Cooling channel mechanism (15) is used for the ventilation and heat of tested detent (31).
In case the ABS experiment table fortuitous event occurs in detent traditional performance process of the test when needing brake hard, start emergency braking mechanism (5), main shaft (7) is promptly stopped operating, the required pressure oil of emergency braking mechanism (5) is provided by hydraulic power unit (28).
Claims (9)
1. the automotive anti-lock braking device experiment table based on the detent inertia test (being called for short the ABS experiment table), comprise main drive motor and control gear thereof, main shaft, one group of inertial flywheel and hanging mechanisms thereof, slide unit and position-limit mechanism thereof, transmission case, transmission shaft and universal joint, cylinder and moving guide rail thereof, normal pressure charger and pressure servo governor motion between tested wheel and the cylinder, side force charger and pressure servo governor motion between tested wheel and the cylinder, wheel cylinder brake pressure switching mechanism, rate signal and force signal sensing device, hydraulic power unit, pressure adjustment assembly, temperature control equipment, emergency braking apparatus, switch board, data recording/processing/demonstration/printing equipment, frame and protective cover is characterized in that: whole ABS experiment table is laid on the ground; Experiment table has the one-piece steel frame, is made by the high torsional resistance steel; The frame upper surface is that main drive motor is installed, transmission case, and main shaft, the basal plane of flywheel system and bearing seat thereof and slide unit, unification is located by keyway; Main drive motor is a direct current motor, adopts the DC speed regulation mode; Inertial flywheel system is made up of 10 flywheels, is divided into two groups by geometric ratio and equal difference, and one group of the geometric ratio distribution is little mass flywheel, adopt flange and Bolt Connection, support is fixed, and one group of the equal difference distribution is big mass flywheel, employing conical surface location is by flywheel outer bolt.
2. ABS experiment table according to claim 1, it is characterized in that: the I axle of transmission case is a power input shaft, it is the part of ABS experiment table main shaft, the II axle is an intermediate shaft, it is passing to the III axle from the power of I axle, the III axle is a power output shaft, through torque sensor, universal joint and drive shaft connects with cylinder, the ratio of gear of transmission case is 1: 1, gear on the II axle can move axially, the power of realizing III axle and I axle engages and separates, this clutch action pushes away/draws realization by an oil cylinder, when being used for the ABS performance test, the III axle of transmission case engages with the power of I axle, and the III axle separates with the power of I axle when being used for the test of detent traditional performance.
3. ABS experiment table according to claim 1 is characterized in that: when being used for the ABS performance test, main drive motor can drive inertial flywheel simultaneously by main shaft and cylinder rotates, and when being used for the test of detent traditional performance, only driving inertial flywheel and rotates.
4. ABS experiment table according to claim 1 is characterized in that: slide unit can move axially and locking in position in pushing away/leaving behind of a servo-cylinder; Can realize axial loading, axial load can be by set point adjustment, and slide unit rotation axis end is a removable connector, and the axletree when being used for fixing the tumbler of detent or ABS test has caliper/back-plate fixed mechanism on the slide unit.
5. ABS experiment table according to claim 1, it is characterized in that: idler is on two rolling bearings, bearing seat is fixed on the rigid carriers, carriage is installed on the rolling guide, but, produce the FEEDBACK CONTROL normal pressure between cylinder and the wheel but make in the promotion bottom bracket VTOL (vertical take off and landing) of a servo-cylinder.
6. ABS experiment table according to claim 1 is characterized in that: accident brake is installed on the main shaft of ABS experiment table, and except that emergency braking function, its brake pressure is adjustable, can realize the adjusting of cylinder rotational resistance torque.
7. ABS experiment table according to claim 1, it is characterized in that: on the pipeline that pressure of wheel cylinder is supplied with, have an X-over, when carrying out the ABS performance test, pressure oil process abs pressure regulator is again to the wheel cylinder fuel feeding, realization is to the adjusting of wheel-braking cylinder pressure, carry out detent traditional performance when test, pressure oil without the abs pressure regulator directly to the wheel-braking cylinder fuel feeding.
8. ABS experiment table according to claim 1 is characterized in that: be used to test the force transducer of brake braking force square, be installed on the rotation axis in the slide unit; Be used to test the torque sensor of cylinder moment, be installed on the transmission shaft between transmission case and the cylinder; The speed probe that is used for the test carriage wheel speed is installed on the slide unit rotation axis; Be used to test the speed pickup of main shaft and drum rotation speed, be installed on the main shaft; The force transducer that is used for the testing tire side force is installed in the inner end that makes the axially movable servo-cylinder of slide unit; Be used to test the force transducer of normal pressure between cylinder and wheel, be installed in the below of idler pulley carriage; Be used to test the pressure transducer of detent brake-pipe pressure, be installed in the brake piping of detent; Be used to test the pressure transducer of main shaft accident brake brake-pipe pressure, be installed in the brake piping of main shaft accident brake; Be used to test 4 temperature sensors of brake temperature, wherein 2 temperature sensors are installed on the fixture of detent, and other 2 temperature sensors are installed on the tumbler of detent, by being installed in the collector ring output on the main shaft.
9. ABS experiment table according to claim 1, it is characterized in that: computer automatic control system has adopted the PC of VME real-time control computer and Windows NT, has diagnosis, analysis and the Presentation Function from normal moveout correction and demarcation, most common failure of ABS performance test control, detent traditional performance test control, experiment table each several part.
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| Application Number | Priority Date | Filing Date | Title |
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| CNB200410046011XA CN100420931C (en) | 2004-06-01 | 2004-06-01 | Test table of automobile braking ABS based on brake inertia test |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200410046011XA CN100420931C (en) | 2004-06-01 | 2004-06-01 | Test table of automobile braking ABS based on brake inertia test |
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| CN1648631A true CN1648631A (en) | 2005-08-03 |
| CN100420931C CN100420931C (en) | 2008-09-24 |
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