The Affect Of Humidity To The Measure Result Of The Hot-film Air Mass Flow Meter

This thesis based on sufficient discussion of the working principle of electronic fuel engine and the technology of engine diagnostic instrument, mainly discussed the air flux gauge, one of the most important sensor of the engine. The key of the electronic control fuel injection engine is to accurately calculate the intake air quantity, in order to control the fuel injection quantity impersonally and exactly, at the same time get the best performance in dynamics and economics. At present, among the air flux gauges which have been used widely, the mode of hot-film or hot-wire positioned the wide future in applications.Still, there is a problem that the result of the test with the hot-film or hot-wire air mass flow meter is changeable with the air humidity and this problem is obviously can not be ignored. This thesis studied the differences and its regulations, which support the improvement and provide the betterment foundation.This thesis based on a series of experiments which use AJR engine of Santana car as test mode and use engine diagnostic instrument PC98 as tools, under different humidity measured the fuel injection persistence, and after doing math regression with the test data a regulation was found, that is the regression formula.After that, based on the regression formula in different regions which have the different climate, some engine running prognosticate have been done, and some fuel consume contrast between normal condition and various climate conditions ware presented, which provide some data can be use as reference. Besides, to the hot-film or hot-wire air mass flow sensor some useful suggestion have been bring forward, which is include of the humidity sensor should be added and the new control module to the humidity should be build up in order to improve the electronic fuel injection system.