| Under the ministry of transportation in No. 29《the Management of Comprehensive Inspection Station of Transport Industry》and GB18565-2001《the Method of Inspection and Comprehensive Requirement of Vehicle》.The vehicle inspection and test technology has developed rapidly in recent years.Due to the substantial increase in the level of application technology, in comprehensive function to inspect vehicle, profession and the detection network of automatic data acquisition has basically taken shape.To meet the requirements of GB 18565-2001, the vehicle inspection and test technology are gradually improving.The development and application of automobile wheelbase difference detector is under the national standards and requirements.Automobile wheelbase difference detector is a kind of special metrical instrument, which requires the equipment itself has enough accuracy and high reliability.Automobile wheelbase difference detector is tested by manufacturer already, but in the transportation and installation their accuracy will change.In the meanwhile, it will be affected by the using environment, maintenance level of detection station. So it must be tested regularly and irregularly.Untill now, it is lack of the calibration equipment of automobile wheelbase difference detector.There is no unified method of automobile wheelbase difference detector, and the national hasn't made the verification regulation of automobile wheelbase difference detector as well.In order to ensure automobile wheelbase difference detector has enough accuracy and good technology condition, it must to develop the accurate calibration equipment of automobile wheelbase difference detector and making verification regulation of automobile wheelbase difference detector to meet the urgent needs.Order to solve the automobile wheelbase difference detector can'nt be worse detector test,and can'nt guarantee the accuracy and technical situation of automobile wheelbase difference detector,the paper mainly accomplishment the work below:1,Analysis the exsiting method of automobile wheelbase differenceAt first the paper discussed the cause of automobile wheelbase difference, the detective meaning of automobile wheelbase difference, and automobile using performance affected by automobile wheelbase difference.These detection methods can be summed up as the wheels imprinted detection, the outline of the wheel detection, and the track the wheel of the test detection, that is, the wheels are on target detection and access to information, identify the position of wheel axis,to realize the detection of automobile wheelbase difference.Provides an important basis, for the development of the calibration equipment of automobile wheelbase difference detector.2,Study on the detecting theory of automobile wheelbase differenceStudy on the detecting theory of automobile wheelbase difference, laid a theoretical foundation to diagnose the unqualified automobile wheelbase difference detector.And as a theoretical basis for the development of the diagnose system of automobile wheelbase difference detector.3,The characteristics and main functions of the calibration equipmentThis paper developed a kind of calibration equipment of automobile wheelbase difference detector, which is adapted to all kinds of automobile wheelbase difference detector now.The celibration equipment has the function of variable wheelbase; the function of front corner; and to achieve simulated car in the following three detector methods, that is: calibrate the equipment in straight line, in oblique line (a certain angle with detector) and in curves, provided the equipment support for the verification agencies of verification and inspection departments. Innovative research productions of this calibration equipment of automobile wheelbase difference detector are as follows:This calibration equipment's main body is collapsible, easy to carry and convenient to transportation. The main framework is made up by two independent parts, which joined by connection hinge. The two parts can rotate with the shaft, so as to achieve the function of fold.The calibration equipment's variable-spindle distance mechanism is easy to operate, not only can meet the normal need of wheelbase difference setting in 0～40 mm, but also can meet the special need of wheelbase difference setting in 0～1500 mm.In the calibration equipment of simulation wheelbase difference value,it used the measurement ball-end equipped on the end of wheel axle as the calibration equipment's wheelbase difference setting basis, which has low error and high reliability. On the front wheel rotation mechanism of calibration equipment, it used the middle of the axle pin as the front wheel's rotating shaft, which avoid the changes caused by rotation of the front wheel and the affection of the verification result.On deflection distance measurement mechanism of calibration equipment, the compact line part of reference seat didn't use the routine compact device,but used the self-made compact line pull rod mechanism that more simple. In addition, this calibration equipment can also achieve the three kinds of simulation automobile testing functions as follows:verification of fixed wheelbase difference in line driving, verification of fixed wheelbase difference in leaning line driving,verification of fixed wheelbase difference in curve driving.4,Study on the method of calibration and the verification regulationAccording to this calibration equipment of automobile wheelbase difference detector,the paper put forward method of calibration,and gave the verification regulation.In addition,this paper also used this equipment to test the automobile wheelbase difference detector of unparallel photosensitive.5,The development of the diagnose system of automobile wheelbase difference detectorAccording to the detecting theory of automobile wheelbase difference in Chapter 3, by using the software of VC++6.0, develop the diagnose systems of automobile wheelbase difference.The diagnose systems are use for the quick diagnose of the automobile wheelbase difference detector,to confirm the fault of the automobile wheelbase difference detector,that is,the software failure or the hardware failure.To sum up, this paper developed a kind of calibration equipment successfully, which is adapted to all kinds of automobile wheelbase difference detector now; put forward the method of calibration, and gave the verification regulation, which is ended up the situation that the automobile wheelbase difference detector couldn't be calibrated.
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