Motor vehicle braking ability monitor station
The utility model belongs to the performances of motor vehicles pick-up unit, particularly relates to the device that detects motor vehicle brake.
Detecting the equipment of motor vehicle safe drive braking ability at present, mainly is anti-force type brake platform and flat brake platform.Drum reaction braking checkout stand is to adopt under action of gravity, the friction that produces between tire and the cylinder is carried out the maximum braking force measurement, because cylinder surface attachment coefficient, wheel angle of setting, cylinder are with problems such as wheel lifts, often can only measure the frictional resistance between wheel and the cylinder, can not survey maximum braking force, the relation that this moment, measured value and axle weighed is big especially.What is more important belongs to Static Detection basically because cylinder surface has only the linear velocity of 2km/h～2.5km/h, because of its drum speed is too low, can not reflect comprehensively that the complexity of damping force in the braking procedure changes.Therefore compare can not be satisfactory for the result of use of anti-force type brake platform and generally acknowledged road method for testing.In recent years the flat brake platform of Chu Xianing is that the friction that the inertial force that utilizes car load to advance produces between tire and test slab is braked force measurement, overcome wheel angle of setting problem, its metering system very tries near the road, but, be difficult to obtain the moving measurement effect of road trial-production because the speed of a motor vehicle generally can only reach about 5km/h.Relevant owing to car load inertial force in addition with the speed before the brake, and this speed is difficult to accurate control in measuring process, data repeatability is had a strong impact on.Structurally, the plate brake stage of same model is difficult to adapt to the wheelspan of various vehicles and the variation of wheelbase, makes its practicality be subjected to bigger restriction.Particularly drag dead braking ability to detect to " ABS " is anti-, these two kinds of brake platforms are all powerless.
The purpose of this utility model provides a kind of motor vehicle braking ability monitor station, it can detect by the detent to motor vehicles under the higher speed of a motor vehicle, can measure the various main braking ability of motor vehicle under the various speed of a motor vehicle comprehensively, exactly, also can carry out braking ability to " ABS " anti-lock braking system and detect.
Above-mentioned purpose of the present utility model realizes by following technical proposals: the dynamic system power that adopts the dynamic calibration mode to carry out under the high speed is measured, select for use the current vortex machine as the braking standard, inertial force according to wheel and cylinder rotation, motor vehicle is carried out braking ability detect, the maximum braking force that can accurately survey in dynamic system power, coordinated time and the braking procedure under the various speed of a motor vehicle is poor.
The utility model is made up of detection stand, cylinder, clutch coupling, braking standard, measurement sensing element, control device, the electricity consumption turbine is as demarcating with the braking standard, the one end is connected with drum shaft by clutch coupling, and the other end links by clutch coupling and motor shaft.The movable road that cylinder constitutes is set on the detection platform underframe, is used to support the driving wheel of tested automobile and rotation thereupon.Monitor station about the tested vehicle can be provided with the cylinder lifting device between the detection platform cylinder for convenience, and load cell is housed in lifting device, can measure wheel load.
When the cylinder on the motor vehicle driving wheel driving detection platform underframe rotates, the electromagnetic clutch that the microcomputer controlled electro turbine is connected with drum shaft directly is coupled, because diameter of cylinder is bigger, therefore the current vortex machine is to be operated in lower-speed state, must strengthen exciting curent, just can make and measure the power bracket maximum, reach specified index, controllable silicon current source exciting curent preferably is controlled at 0-30A.In order to make eddy-current disc in operation process, not be subjected to the influence of resistance, improve measuring accuracy, dynamic calibration preferably adopts the good disc type current vortex machine of low-speed performance as the braking standard.The tachogenerator that is arranged on each drum shaft becomes corresponding pulse with the transformation of speed of axle, can demonstrate the driving wheel speed of automobile after MICROCOMPUTER PROCESSING; Adopt high-precision tachogenerator, can improve the measuring accuracy of retarded velocity; Load back and brake moment for the current vortex machine by the controllable silicon current source, the force cell that is arranged on the current vortex machine is converted into the correspondent voltage signal with pressure signal; Dynamometry, tachogenerator acquired signal during braking automobile, the wheel load signal that load cell is gathered during with lifting calculates, demonstrates the damping force value of motor vehicle driving wheel after MICROCOMPUTER PROCESSING.
Motor can select for use frequency conversion adjustment speed device to carry out speed governing, and purpose is to make the anti-chassis portion of tested vehicle that drags of motor vehicle braking ability monitor station with any speed running in the 0-120km/h scope.Adopt microcomputer to control the break-make and the speed governing of electromagnetic clutch, thyristor supply, variable-frequence governor respectively, carry out the collection and the processing of rotating speed and driving force signal, can pass through dot matrix lamp bank, printer demonstration and output testing result at last.In order to improve the attachment coefficient of wheel, make its attachment coefficient and road surface more approaching, to improve measuring accuracy, can adopt major diameter cylinder (more preferably greater than 350mm), cylinder surface is more coarse.
The utility model braking ability monitor station adopts industrial control microcomputer control, can accurately measure 30 to 50km/h in addition the higher speed of a motor vehicle under damping force and the time dependent curve of damping force, the overall process that can very comprehensive reflection damping force increases.Because of measurement result and gravity almost irrelevant, thereby avoided the angle of setting problem.Can also monitor in real time simultaneously,, particularly can make total system enter constant speed state accurately and fast, reduce when measuring wearing and tearing engine as hydraulic pressure, water temperature, overload, brake pedal force etc. to system-wide each several part operating mode.It has, and the principle of detection is new reasonable, simple in structure, easy to use, automaticity is high, can accurately measure damping force and braking curve, accurately measure " damping force coordinated time " and advantages such as " maximum braking force in the braking are poor ".Also can effectively detect " ABS " anti-lock braking system.
Be that embodiment is described in further detail of the present utility model below with the accompanying drawing;
Fig. 1 is a structural representation of the present utility model;
Fig. 2 is a functional-block diagram of the present utility model;
Among the figure; The 1st, electromagnetic clutch, the 2nd, current vortex machine, the 3rd, electromagnetic clutch, the 4th, preceding left drive roll, the 5th, electromagnetic clutch, the 6th, preceding right drive roll, the 7th detects stand, the 8th, tachogenerator, the 9th, gear wheel, the 10th, right lifting jack, the 11st, back right roller, the 12nd, gear wheel, the 13rd, gear wheel, the 14th, back left wheel, the 15th, left lifting jack, the 16th, gear wheel, the 17th, force cell, the 18th is adjusted anti-motor, the 19th, the load cell of dragging.
In Fig. 1, the utility model is by detecting stand 7, drive roll 4 and 6, auxiliary cylinder 11 and 14 constitutes the movable road (detection platform) of two tested wheels, lifting cylinder 15 is housed between cylinder 4 and 14, lifting jack 10 is housed between cylinder 6 and 11, in the lifting jack 10 and 15 first halves, load cell 19 is housed, the axle of cylinder 4 links by the axle of electromagnetic clutch 3 with current vortex machine 2, force cell 17 is housed on current vortex machine 2, the other end that the current vortex machine is 2 bumps clutch coupling 1 by electricity and is connected with the anti-axle of motor 18 that drags of adjustment, the anti-motor 18 that drags of this speed governing is driven by the frequency conversion adjuster, current vortex machine 2 provides the exciting curent of 0-30A to load by the controllable silicon current source, electromagnetic clutch 1 can link to each other with industrial control microcomputer by the clutch coupling power supply with 3, and a complete set of equipment can be controlled and be measured by industrial control microcomputer.
In order to distinguish motor vehicle left and right wheels damping force, connect with electromagnetic clutch 5 between two drive rolls 4 and 6, two cylinders 4 and 6 connect together during acceleration, guarantee left and right wheels speed unanimity, unclamp electromagnetic clutch 5 during braking.In order to reach the speed of a motor vehicle of regulation,, go back useable electric moter 18 counter dragging except that with the engine driven of motor vehicle.In order to prevent that the driving wheel running from slippage taking place, in detection platform (being cylinder 4 and 14) both sides two gear wheels 9 and 12 can be set, in the both sides of cylinder 6 and 11 two gear wheels 13 and 16 can be set.The type of cooling of current vortex machine 2 selects disc type by the rehydration cooling system.