Reliability modeling method for special vehicle lubricating oil supply system

Abstract

The invention discloses a reliability modeling method for a special vehicle lubricating oil supply system and belongs to the technical field of mathematical modeling. The reliability modeling method carries out reliability modeling of the special vehicle lubricating oil supply system under the situation of taking the flowing direction and the multi-mode characteristic of oil into consideration according to the features of the aim of reliability of the special vehicle lubricating oil supply system, and the complex reliability logical relationship between an oil supply branch and an overpressure oil return branch is reasonably described in a model. Particularly, the influence of the oil state on the reliability of the system and the complex reliability logical relationship between units are described through user-defined operational characters, the transfer direction of the oil is represented through directed connecting lines between the operational characters, and therefore the reliability model of the special vehicle lubricating oil supply system is built on the basis of a task success stream of the special vehicle lubricating oil supply system, and the confidence level of the reliability model is increased.

Description

technical field [0001] The invention relates to the technical field of mathematical modeling, in particular to a reliability modeling method of a special vehicle lubricating oil supply system. Background technique [0002] The main function of the lubricating oil supply system for special vehicles is to continuously provide oil to complex devices such as engines and transmission boxes with stable oil pressure. and so on. The principle of a typical special vehicle lubricating oil supply system is as follows: figure 1 shown. [0003] The oil pump P1 transfers the lubricating oil in the oil pan U1 into the pressure oil tank U2, and then supplies oil to the hydraulic and lubrication systems of special vehicles. Generally, two parallel coarse oil filters LF1 and LF2 are installed between the oil pan U1 and the oil pump P1 to filter the oil for the first time; an essential oil filter LF3 is installed between the oil pump P1 and the pressure oil tank U2 to filter the oil for the...

AI Technical Summary

Problems solved by technology

figure 1 In the special lubricating oil supply system shown, whether the overpressure circuit is in the working state is not determined by the state of each unit, but by the oil pressure in the pressure oil tank. The reliability block diagram model cannot consider the impact of the oil pressure state on the system. impact on reliability;

[0009] (2) There are complex correlations between the reliability of certain units in the special vehicle lubricating oil supply system, which is difficult to express through simple logical relationships such as series, parallel, bypass, and voting

figure 2 In the shown reliability block diagram model, the constant pressure valve RV and other units are connected in series, that is, once the constant pressure valve RV is damaged, the system cannot work. In fact, when the pressure in the pressure tank does not exceed the safety upper limit, even the constant pressure The system can still work normally if the valve RV is damaged, and this kind of reliability problem cannot be described by the logical relationship in the block diagram model

[0010] It can be seen that the reliability model established by the block diagram method cannot truly describe the reliability of the special vehicle lubricating oil supply system, and the reliability of the model is low

Images