Input and output characteristics of vacuum booster. There is an inflection point on each curve corresponding to different vacuum degrees in the figure, called the maximum power assist point, that is, the point at which the pressure difference acting on the servo diaphragm reaches its maximum as the input force increases. From this point on, the increase in output force is equal to the increase in input force.
According to QC/T307-1999 "Technical Conditions for vacuum Booster", the vacuum degree of the vacuum source during the test is 66.7±1.3kPa (500±10mmHg). The input and output characteristics of the vacuum booster are preliminarily determined by the calculation method. According to the working principle of the vacuum booster, two characteristic parameters on the characteristic curve can be approximated: the input force corresponding to the maximum power point and the sum; The ratio of the output force to the input force before the maximum power point, namely the power ratio
