CN104534998A - Measuring device for automobile basic parameters and measuring method of measuring device - Google Patents
Measuring device for automobile basic parameters and measuring method of measuring device Download PDFInfo
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- CN104534998A CN104534998A CN201510028297.7A CN201510028297A CN104534998A CN 104534998 A CN104534998 A CN 104534998A CN 201510028297 A CN201510028297 A CN 201510028297A CN 104534998 A CN104534998 A CN 104534998A
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Abstract
The invention provides a measuring device for automobile basic parameters and a measuring method of the measuring device. A laser distance measuring sensor which serves as a direct measuring tool is installed on a bracket provided with a lifting mechanism and a rotary mechanism, and the bracket is driven by a linear driving device to move along the length direction of a base, so that the laser distance measuring sensor is moved to a needed position to be measured. The measuring device provided by the invention further comprises a wheel center positioning device for positioning the center of a found wheel, a wheel track measuring assistant device for measuring the distance between left and right wheels in an assistant manner, and an angle measuring assistant device for measuring the approach angle and departure angle of the automobile in an assistant manner. The measuring device provided by the invention can be used for solving the problems that the conventional manual measuring method is relatively great in measuring error, inconvenient to operate and the like and can be used for precisely measuring length, width, height, distance between front and back wheels, a wheel base, the approach angle and the departure angle.
Description
Technical field
The present invention relates to automobile basic parameter fields of measurement, provide a kind of measured automobiles length, the device extremely measuring method of the basic parameters such as wheel base, wheelbase and approach angle departure angle.
Background technology
The length of automobile, wheel base, wheelbase and approach angle, departure angle are the basic parameters of Automobile Design, are also the basic datas required for other control system simultaneously.And these data are requisite data when developing automobile other system or design car load.Especially in some application of military domain, such as, when transporting vehicle at a distance, just must consider making full use of of space, at this moment just accurately must know that the parameters such as the length and width of vehicle are high are transported to arrange loading pattern; Offroad vehicle by property, just must measure approach angle, departure angle.At present, the testing agency of China's automobile is for the measurement of vehicle overall dimension, still continue to use steel tape, tape measure and mark post and carry out hand dipping, not only labour intensity is large for this kind of method, and efficiency is low, and measuring result error is larger, and it is also very inconvenient to operate, such as measured automobiles height, peak is often at automobile top, and top is to the distance just bad measurement of level ground.But both can facilitate accurate measured automobiles length, wheel base, wheelbase and approach angle, the integral test system of departure angle also do not occur.Therefore, developing one can accurately measured automobiles length, wheel base, wheelbase, and the composite measurement platform of approach angle departure angle is necessary.
Summary of the invention
The present invention is directed to above-mentioned technical matters and devise a kind of automobile basic parameter measurement mechanism, solve manual measurement method measuring error traditional at present comparatively large, the problem that inconvenient operation etc. are not enough, achieve the accurate measurement to automobile parameter.
A kind of automobile basic parameter measurement mechanism, comprising:
Base, it is placed horizontally on ground, as carrying platform;
Linear drive apparatus, it is arranged at the both sides of described base, arranges along described base length direction;
Support, comprise vertical rack and horizontal stand, described vertical rack is connected on described linear drive apparatus, along described base length direction rectilinear motion under the driving of described linear drive apparatus, described horizontal stand is connected with described vertical rack, in horizontally disposed, support is provided with rotating mechanism and elevating mechanism;
Laser range sensor, it is arranged on described horizontal stand, and measurement target is to the distance of described laser range sensor;
Wheel center locating device, it is arranged at the outside of wheel, can locate the center of wheel outermost plane, makes laser range sensor find the upright plane at the place, center of wheel to measure;
Wheelspan measures servicing unit, and it is arranged at two wheel places, left and right, and described wheelspan is measured servicing unit and had two subsidiary faces, measures the distance in described two subsidiary faces thus the distance obtained between left and right wheels by using laser range sensor;
Measurement of angle servicing unit, it is arranged at wheel place, upper flat plate props up wheel and the position the most outstanding with automotive suspension bottom contacts, lower flatbed horizontal is placed, use the distance between two fixed measuring points on laser range sensor measurement upper flat plate, obtain the angle of wheel tangent line by this contact point and lower dull and stereotyped upper surface, just can obtain approach angle and the departure angle of automobile.
Preferably, described base is provided with levelling gear and level meter, makes described base upper surface maintenance level by the adjustment of described levelling gear and the verification of described level meter.
Preferably, described base both sides are provided with two straight-line grooves, and described linear drive apparatus is installed in described straight-line groove, and described groove is provided with dust cover, prevent dust from falling in described linear drive apparatus.
Preferably, described linear drive apparatus is provided with position measurement sensor, the position of described linear drive apparatus motion can be measured.
Preferably, described rotating mechanism is arranged on vertical rack, comprise bottom bearings and be installed on the bearing in described bearing seat, described vertical rack is installed in bearing seat, and the position can rotating and then adjust horizontal stand makes it extend along described base length direction or extend in the width direction.
Preferably, described elevating mechanism comprises vertical bar, quill, pulley and steel wire, described quill and vertical bar are slidably connected, described steel wire one ends wound is on described pulley, another point is fixedly connected with quill, rotary pulley realizes the lifting of quill by the drive of steel wire, thus adjustment arranges the height of laser range sensor thereon.
Preferably, described wheel center locating device comprises four-jaw chuck and location-plate, described four-jaw chuck blocks the excircle of wheel, by measure distance measuring sensor to described side two location-plates between range difference, the distance between the center that just can obtain former and later two lateral wheel faces of vehicle side.
Preferably, described wheelspan is measured servicing unit and is comprised the first baffle plate, second baffle and crossbeam, described first baffle plate is fixedly connected with crossbeam, described second baffle and crossbeam are slidably connected, described first baffle plate and described second baffle are arranged in parallel, fit outside described first baffle plate and left wheel, fit inside second baffle and right side wheels.
Preferably, described measurement of angle servicing unit comprises upper flat plate, lower flat board and support bar, described upper flat plate and lower dull and stereotyped one end are connected through the hinge, and make to form certain angle between described upper flat plate and lower flat board, and described support bar can fix upper flat plate and lower flat board makes it to keep fixed angle.
Present invention also offers a kind of automobile basic parameter measuring method using above-mentioned automobile basic parameter measurement mechanism, comprise the following steps:
Step one, laser range sensor move under linear drive apparatus drives, and measure the distance of the point on car to described laser range sensor, calculate the angle of automobile longitudinal center line and described laser range sensor moving direction, the angle namely between automobile longitudinal center line and base centerline;
Step 2, the laser range sensor of both sides is placed on same level line, measured automobiles is along the length of described base length direction and Width and width, and along the wheel base in described base length direction, according to the angle between automobile longitudinal center line and described base centerline, convert the length, width and the wheel base that obtain automobile, by a laser range sensor as roof end, directly measure the height obtaining automobile;
Step 3, use laser range sensor measure the distance that described wheelspan measures two subsidiary faces of servicing unit, and this distance just can be converted into the wheelspan of automobile;
Step 4, described measurement of angle servicing unit is positioned over respectively the rear of front vehicle wheel front and rear wheel, upper flat plate props up front and back wheel and the position the most outstanding with automotive suspension bottom contacts, laser range sensor is used to measure its distance to upper flat plate between two fixing measuring points, obtain the angle of wheel tangent line by this contact point and lower dull and stereotyped upper surface, this angle is approach angle and the departure angle of automobile.
Beneficial effect of the present invention: adopt laser range sensor to have high, the fireballing feature of precision as measurement mechanism, automobile only need be stopped on base by user, this device can complete the measurement of automobile length, wheelspan, approach angle, departure angle automatically, save manpower, and it is comparatively large to solve manual measurement method measuring error traditional at present, the problems such as inconvenient operation.
Accompanying drawing explanation
Fig. 1 is automobile basic parameter measurement mechanism structural representation of the present invention.
Fig. 2 is linear drive apparatus structural representation of the present invention.
Fig. 3 is linear drive apparatus movable part schematic diagram of the present invention.
Fig. 4 is holder pivots structural scheme of mechanism of the present invention.
Fig. 5 is support lifting mechanism front view of the present invention.
Fig. 6 is support lifting mechanism left view of the present invention.
Fig. 7 is laser range sensor position of the present invention front view.
Fig. 8 is laser range sensor position of the present invention vertical view.
Fig. 9 is wheel center locating device front view of the present invention.
Figure 10 is wheel center locating device left view of the present invention.
Figure 11 is that wheelspan of the present invention measures servicing unit front view.
Figure 12 is that wheelspan of the present invention measures servicing unit vertical view.
Figure 13 is that wheelspan of the present invention measures servicing unit scheme of installation.
Figure 14 is measurement of angle assistant apparatus structure schematic diagram of the present invention.
Figure 15 is wheelbase of the present invention and centerlines measuring principle figure.
Figure 16 is length of the present invention and width measure schematic diagram.
Figure 17 is height measurement principle figure of the present invention.
Figure 18 is approach angle of the present invention, departure angle measuring principle figure.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail, can implement according to this with reference to instructions word to make those skilled in the art.
As shown in Figure 1, the invention provides a kind of automobile basic parameter measurement mechanism, comprise base 1, support 2, linear drive apparatus 3, linear drive apparatus 3 is provided with can the slide block 4 of rectilinear motion, support 2 is fixed on slide block 4, support is provided with laser range sensor 5, and measured automobile 6 is parked on base 1.Be provided with leveling lower margin bottom base 1, four angles are provided with circular bubble to base 1 upper surface, by adjusting leveling lower margin and checking that circular bubble ensures base 13 upper surface level.There are two grooves arranged along its length base 1 both sides, and linear drive apparatus 3 is positioned at groove, be closely fixedly connected with, groove is provided with dust cover by bolt with base 1, prevent dust from falling in linear drive apparatus 3.
The structure of linear drive apparatus 3 as shown in Figure 2, two guide rails 7 of the left and right sides, 8 are supported by multiple guide rail support block 14, and be fixedly connected with by bolt 24, every root guide rail is all provided with two sliding shoes 15, can at guide rail 7, move on 8, the upper plane of four sliding shoes 15 is fastenedly connected by bolt and a movable support plate 16, guide rail 7, 8 be connected with backing plate at bottom 13 below by bolt, backing plate at bottom 13 and the two supports block 9 at guide rail two ends, 10 are connected by bolt 23, the back-up block 9 at two ends, 10 built with bearing, leading screw 11 passes through bearing, by the back-up block 9 at two ends, 10 are fixed on table top, movable block 25 leading screw 11 is equipped with, its top is fixedly connected with by bolt 22 with mobile support plate 16, leading screw 11 is connected with servomotor 12 by shaft coupling 17.Consult Fig. 3 in the lump, movable block 25 is connected with leading screw 11 by screw thread, a laser beam emitting device 27 and a laser receiver 28 are equipped with in movable block bottom, between these two devices, there is a spacing to be the metal gate glazing bar 26 of 1mm, metal gate glazing bar 26 is connected with the reeded contiguous block 29,30 of band by bolt, and contiguous block 29,30 is fixedly connected with 10 with the rest pad 9 at leading screw two ends respectively.Because when there is no barrier between laser beam emitting device 27 and receiving trap 26, the signal that receiving trap 28 is returned to control single chip computer is high level, otherwise the signal passed back is low level, when movable block 25 moves along leading screw 11, laser beam emitting device 27 bottom it and receiving trap 28 also move along metal gate glazing bar 26, at this moment the signal that laser receiver 28 is passed back is the pulse signal that low and high level replaces, write down the number of pulse by monolithic counter function, just can obtain the distance of movable block 25 along leading screw 11 movement.
Holder pivots mechanism is as Fig. 4, support is fixed on mobile support plate 16, firm banking 31 and mobile support plate 16 are closely connected by bolt, and two bearings 33,34 are housed in firm banking 31, and rotating part 32 is assembled together by bearing 33,34 and base 31, square-section bar 35 is vertically welded on rotating bearing component 32, also be welded with lifting catanator in the lower end of square-section bar 35, be used for controlling the lifting of rack beam, primarily of support bar 36, runner 37, turning handle 38 is formed; Handle 39 is arranged on rotating stand 32.
The schematic diagram of support lifting mechanism is as Fig. 5, shown in Fig. 6, quill 41 moving up and down is contained on square-section bar 35, there is rectangular recess slideway each side with square-section bar 35, pulley 47, 48, 49, 50, 51, 52, 53, 54 are arranged on the side of quill 41, rectangular opening is had in the position of the sleeve 41 installing pulley, pulley is against on the slideway of square-section bar 35 by rectangular opening, slideway rolls, and can regulate by the screw outside adjustable pulley the position slided between slideway, guarantee that sleeve moves up and down Shi Nengbao vertical, pulley mounting seat 42 is equipped with at montant 35 top, and pulley 43,44,45 is arranged on base 42, fixed-hinged support 58 and 61 is mounted by means of bolts on moving sleeve 41, horizontal stand 59 one end is connected with fixed-hinged support 61 by switching part 60, the other end is for installing laser range sensor 64, as shown in Figure 6, Figure 7, drag link 56 one end is connected with fixed-hinged support 58 with switching part 57, and the other end is connected with horizontal stand 59 by same mode.Draw ring 46 is bolted on drag link 56, be used for fixing one end of thin steel rope 40, thin steel rope is fixed on roller 37 through pulley 43,44,45 bottom, by turning handle 38 rotation roller, thin steel rope 40 is made to be wrapped on roller 37, the height of horizontal stand 59 changing moving sleeve 41 and be fixedly connected with it.
Wheel center locating device as shown in Figure 9, Figure 10, four claws 69,70,72,73 of four-jaw chuck are stuck on the outer table top of tire 68, claw 69,70,72,73 has a fixed mechanism 71, can ensure that in pawl, the displacement of external extension is consistent, location-plate 74 can turn to core wheel institute planar, be used for locating wheel center, during measurement, use laser range sensor.
Figure 10, wheelspan shown in Figure 11 is measured when servicing unit is used to measuring wheel distance and is got tire tangent plane position, first baffle plate 75 fixedly welds with beam 76 and can ensure vertical, the other end of beam 76 installs a slide block 79, the part of beam 76 being installed slide block 79 is fluted, the face contacted with beam 76 of slide block there is corresponding projection, be combined together gap when ensure that mobile like this, second baffle 82 is fixed by bolt and slide block, and ensure with first when plate 75 is parallel, rest pad 77 is fixed on beam 76 by tommy, rest pad 80 is bolted on one end of beam 76, two rest pads 77 and 80 are provided with a circular pin 81 by bolt, be used for leading and stablize second baffle plate 82, spring 78 is housed between circular pin 81 and rest pad 77, effect is that second baffle 82 and tire medial surface are close together.Second baffle 82 is arranged on slide block 79 by bolt.The concrete in use mounting means of this mechanism is as shown in figure 13, tangent with the lateral surface of wheel 84 inside the first baffle plate 75, the outside of second baffle 82 and the medial surface of wheel 83 tangent.Distance between two baffle plates measured with laser range sensor just can calculate the distance between two tire tread centers.
Measurement of angle servicing unit as shown in figure 14, be formed by connecting by pin 86 primarily of upper flat plate 85 and lower dull and stereotyped 87, upper flat plate 85 is provided with the handle 91 for mentioning upper flat plate 85, support bar 92 is fixed in base plane 87 by bolt 88, the other end is connected with upper plane 85 by lock-screw 93, when two flat boards at an angle time, by lock-screw 93 lock support bar 92, upper flat plate 85 and lower dull and stereotyped 87 can be made to keep fixing; Upper flat plate 87 is provided with two measurement points 89,90, and the distance of two measurement points is 1m, and when taking measurement of an angle, by the vertical distance of laser range sensor survey sensor to these two points, the distance then calculated on vertical direction just can obtain angle.
Present invention also offers a kind of automobile basic parameter measuring method, its step is as follows:
Step one, use laser range sensor measure the distance of the point on car to described laser range sensor, calculate the angle between automobile longitudinal center line and described base centerline, as shown in figure 15, laser range sensor on one side stand is turned to along on the direction of linear drive apparatus, namely now laser range sensor is just to the position A of wheel, traversing carriage makes the luminous point of laser just to the center of a wheel, the numerical value of read sensor, these number of degrees just can be regarded as the distance L of sensor to wheel center
aF, then by the position B of support-moving to another wheel center place, the reading of sensor is exactly the distance L of sensor to wheel center
bG; Profit uses the same method and measures the distance L of opposite side sensor to two wheel centers
cHand L
dE; Laser range sensor is moved to O position, record sensor and be respectively L to the distance of two-wheeled core wheel
gRand L
fQ.According to these parameters recorded, utilize following formula, obtain the angle α between automobile longitudinal center line and test board center line:
Step 2, use laser range sensor measured automobiles along the length of described base length direction and Width and width, and along the wheel base in described base length direction, and to convert the length, width and the wheel base that obtain automobile according to the angle between automobile longitudinal center line and described base centerline, use laser range sensor directly to measure the height obtaining automobile.
As shown in figure 16, two supports are made to lay respectively at the rear and front end place of two linear drive apparatus, distance now between two sensors is D, at this moment the laser range sensor be fixed on support lays respectively at the front and rear of tested vehicle, move left and right the position that laser range sensor makes measurement luminous point the most outstanding in automobile front and rear part, measure several groups of data respectively, get minimum value more afterwards, for not counting X
fand X
r, the length calculating automobile according to these parameters is:
L
0=(D-X
f-X
r)cosα
The measurement of vehicle width as shown in figure 17, two support-movings are to tested vehicle both sides, and swinging mounting crossbeam, makes both sides laser range sensor just to vehicle body, the most outstanding position, range estimation vehicle body both sides, the distance measured between both sides linear drive apparatus to the most outstanding position, vehicle body both sides is respectively Y
1and Y
2, the distance between the linear drive apparatus of both sides is B, and the width calculating automobile is:
W=(B-Y
1-Y
2)cosα
Support is positioned at the both sides of tested vehicle, swinging mounting makes crossbeam be positioned at directly over automobile, laser range sensor is moved in position to column, laser range sensor is made to be positioned at vehicle outer side, regulate horizontal depth of beam, make the lower plane of crossbeam be close to above vehicle, traversing carriage, finding the peak of automobile, is then H by the distance of laser range sensor measuring distance testing stand
1, the distance of the bottom distance measurement lower flat of laser range sensor is H
2.Utilize following formula, the height calculating automobile is:
H=H
1+H
2
Step 3, use laser range sensor are measured described wheelspan and are measured the distance in two subsidiary faces of servicing unit and then obtain wheelspan.Wheelspan being measured servicing unit is arranged between two front-wheels according to aforementioned manner, uses laser range sensor to measure the first baffle plate and the second baffle distance W to laser displacement sensor respectively
1and W
2, then the wheelspan of front-wheel is calculated by the angle α between the automobile longitudinal center line recorded and described base centerline:
B
1=(W
2-W
1)cosα
In like manner, wheelspan is measured servicing unit and be arranged between two trailing wheels according to aforementioned manner, use laser range sensor to measure the first baffle plate and the second baffle distance W to laser displacement sensor respectively
3and W
4, utilize following formula to obtain rear track:
B
2=(W
4-W
3)cosα
Step 4, as shown in figure 18, measurement of angle servicing unit is positioned over the rear of front vehicle wheel front and rear wheel, and prop up front and back wheel, upper flat plate is raised up to and is close to the most outstanding position of wheel table top and automobile fore suspension and rear suspension bottom, and upper flat plate is locked, now, the angle theta between two planes is exactly approach angle or departure angle, and measuring distance on upper flat plate with laser range sensor is the distance P of two point of fixity to laser range sensor of S
1and P
2, utilize following formula to obtain approach angle or departure angle:
Although embodiment of the present invention are open as above, but it is not restricted to listed in instructions and embodiment utilization, it can be applied to various applicable the field of the invention completely, for those skilled in the art, can easily realize other amendment, therefore do not deviating under the universal that claim and equivalency range limit, the present invention is not limited to specific details and illustrates here and the legend described.
Claims (10)
1. an automobile basic parameter measurement mechanism, is characterized in that, comprising:
Base, it is placed horizontally on ground, as carrying platform;
Linear drive apparatus, it is arranged at the both sides of described base, arranges along described base length direction;
Support, comprise vertical rack and horizontal stand, described vertical rack is connected on described linear drive apparatus, along described base length direction rectilinear motion under the driving of described linear drive apparatus, described horizontal stand is connected with described vertical rack, in horizontally disposed, support is provided with rotating mechanism and elevating mechanism;
Laser range sensor, it is arranged on described horizontal stand, and measurement target is to the distance of described laser range sensor;
Wheel center locating device, it is arranged at the outside of wheel, can locate the center of wheel outermost plane, makes laser range sensor find the upright plane at the place, center of wheel to measure;
Wheelspan measures servicing unit, and it is arranged at two wheel places, left and right, and described wheelspan is measured servicing unit and had two subsidiary faces, measures the distance in described two subsidiary faces thus the distance obtained between left and right wheels by using laser range sensor;
Measurement of angle servicing unit, it is arranged at wheel place, upper flat plate props up wheel and the position the most outstanding with automotive suspension bottom contacts, lower flatbed horizontal is placed, laser range sensor is used to measure its distance to upper flat plate between two fixed measuring points, obtain the angle of wheel tangent line by this contact point and base upper surface, obtain approach angle and the departure angle of automobile.
2. automobile basic parameter measurement mechanism according to claim 1, it is characterized in that, described rotating mechanism is arranged on vertical rack, comprise bottom bearings and be installed on the bearing in described bearing seat, described vertical rack is installed in bearing seat, and the position can rotating and then adjust horizontal stand makes it extend along described base length direction or extend in the width direction.
3. automobile basic parameter measurement mechanism according to claim 1 and 2, it is characterized in that, described elevating mechanism comprises vertical bar, quill, pulley and steel wire, described quill and vertical bar are slidably connected, described steel wire one ends wound is on described pulley, another point is fixedly connected with quill, and rotary pulley realizes the lifting of quill by the drive of steel wire, thus adjustment arranges the height of laser range sensor thereon.
4. automobile basic parameter measurement mechanism according to claim 3, it is characterized in that, described wheelspan is measured servicing unit and is comprised the first baffle plate, second baffle and crossbeam, described first baffle plate is fixedly connected with crossbeam, described second baffle and crossbeam are slidably connected, described first baffle plate and described second baffle are arranged in parallel, and fit, fit inside second baffle and right side wheels outside described first baffle plate and left wheel.
5. automobile basic parameter measurement mechanism according to claim 4, it is characterized in that, described base both sides are provided with two straight-line grooves, and described linear drive apparatus is installed in described straight-line groove, described groove is provided with dust cover, prevents dust from falling in described linear drive apparatus.
6. automobile basic parameter measurement mechanism according to claim 1, is characterized in that, described linear drive apparatus is provided with position measurement sensor, can measure the position of described linear drive apparatus motion.
7. automobile basic parameter measurement mechanism according to claim 1, it is characterized in that, described wheel center locating device comprises four-jaw chuck and location-plate, described four-jaw chuck blocks the excircle of wheel, by measure distance measuring sensor to described side two location-plates between range difference, the distance between the center that just can obtain former and later two lateral wheel faces of vehicle side.
8. automobile basic parameter measurement mechanism according to claim 1, it is characterized in that, described measurement of angle servicing unit comprises upper flat plate, lower flat board and support bar, described upper flat plate and lower dull and stereotyped one end are connected through the hinge, make to form certain angle between described upper flat plate and lower flat board, described support bar can fix upper flat plate and lower flat board makes it to keep fixed angle.
9. the automobile basic parameter measurement mechanism according to any one of claim 1-2,4-8, it is characterized in that, described base is provided with levelling gear and level meter, makes described base upper surface maintenance level by the adjustment of described levelling gear and the verification of described level meter.
10. use an automobile basic parameter measuring method for the automobile basic parameter measurement mechanism according to any one of claim 1-8, it is characterized in that, comprise the following steps:
Step one, laser range sensor move under linear drive apparatus drives, and measure the distance of the outermost point of car axle end cap to described laser range sensor, calculate the angle of automobile longitudinal center line and described laser range sensor moving direction, the angle namely between automobile longitudinal center line and base centerline;
Step 2, the laser range sensor of both sides is placed on same level line, measured automobiles is along the length of described base length direction and Width and width, and along the wheel base in described base length direction, according to the angle between automobile longitudinal center line and described base centerline, convert the length, width and the wheel base that obtain automobile, by a laser range sensor as roof end, directly measure the height obtaining automobile;
Step 3, use laser range sensor measure the distance that described wheelspan measures two subsidiary faces of servicing unit, according to the angle between automobile longitudinal center line and described base centerline, convert and obtain the wheelspan of automobile;
Step 4, described measurement of angle servicing unit is positioned over respectively the rear of front vehicle wheel front and rear wheel, upper flat plate props up wheel and the position the most outstanding with automotive suspension bottom contacts, lower flatbed horizontal is placed, laser range sensor is used to measure its distance to upper flat plate between two fixed measuring points, obtain the angle of wheel tangent line by this contact point and lower dull and stereotyped upper surface, just can obtain approach angle and the departure angle of automobile.
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