The principle of auto gasoline octane number tester is according to ASTM D2699/D2700- CFR test engine
, which is internationally recognized. It is measured under strict test conditions by means of a standard engine with a variable compression ratio and by reference fuel. The new determination instrument is used to determine the comprehensive permittivity of fuel components. It is a rigorous mathematical model for the return of the theoretical basis, by means of advanced electronic measurement technology, with CFR test engine results for the standard, targeted to return to the determination of targeted to ensure measurement accuracy. It broke through the quantity cannot dissemination problem, equivalent to CFR test engine for QX series apparatus dissemination, achieving with the relevant national standard.