汽车检测常见问题（Common problems in automobile inspection）.docVIP

汽车检测常见问题（Common problems in automobile inspection） 1 automotive technology status: a quantitative measure of the total value of the parameters representing the appearance and performance of a car at a given moment. 2 car inspection: Inspection and measurement of the technical condition or work capacity of a car. 3 car diagnosis: in the absence of disassembly (or only the removal of small pieces) conditions, determine the technical condition of the car or identify the location of the fault, the cause of the detection, analysis and judgment. 4 automotive diagnostic parameters include working process parameters, accompanying process parameters and geometric size parameters. 5, the choice of diagnostic parameters: sensitivity, single value, stability, information, economy, 6 types of diagnostic criteria: national, industry, local, enterprise 7 the standard composition of diagnostic parameters: initial value Pf, allowable value Pd and limit value Pn. 8 classification of measurement error: divided into absolute and relative according to the method of measurement error, divided into system, random and fault according to the law of measurement error, divided into static and dynamic according to the state of measurement error. 9 the absolute error is the difference between the measured value and the measured value. The relative error is the ratio of the absolute error of the measured value to the true value of the measured value, expressed as a percentage. 10, the detection equipment generally use the maximum reference error can not exceed the allowable value, as a classification accuracy scale, the common accuracy levels are 0.1, 0.2, 0.5, 1, 1.5, 2, 2.5, 5 11 system error: multi