Medium-Duty Commercial Trucks Operation Fault Regularity and Use Reliability

In order to accurately describe the operation fault statistical regularity and use reliability of commercial truck, based on the large sample firsthand data collected in the practical operation of 129 vehicles for several years, and by way of strict parameter estimating and hypothesis testing, it is affirmed that the operation fault of medium-duty commercial trucks made by two different manufacturers obey two parameter Weibull distribution without exception. At the same time, the mathematical expressions of their fault density function ƒ(l), the fault distributive function F(l), the reliability function R(l) and the fault rate function λ(l) of the medium-duty commercial trucks are established also. In addition, by means of statistical analysis of the firsthand data and corresponding function expressions, some important estimators and observed values, which can represent the reliability characteristic values of these commercial trucks, are got also. The research can provide scientific and reliable basis for grasping the operation fault statistical regularities and reliability levels of medium-duty commercial trucks made in China accurately, organizing transport production, maintenance and repair of vehicle rationally.