NOVELTY - A system for controlling, in real time, the ignition point of biodiesel in the methanol evaporation process, comprises: (i) a chamber containing the vapor pressure; (ii) an evaporator; (iii) a solenoid valve that controls the inlet and outlet of the steam flow in the chamber; (iv) a methanol sensor; (v) a microprocessor which controls both the evaporator temperature and the control system ignition point; and (vi) a bus wire that sends signals from the methanol sensor to the control system.    USE - A system for controlling, in real time, the ignition point of biodiesel in the methanol evaporation process (claimed).    ADVANTAGE - The system prevents the generation of a spark and the consequent combustion of the vapor occurring in other methods for measuring the ignition point, allowing a precise measurement to be obtained in a simpler manner. Once the ignition point has been estimated, the system determines when the biodiesel has reached an ignition point higher than the lower flammability threshold temperature, and feeds the information back for the control of the evaporator, thus obtaining a biodiesel of the desired quality at the end of the process.    DETAILED DESCRIPTION - A system for controlling, in real time, the ignition point of biodiesel in the methanol evaporation process, the ignition point of the biodiesel is estimated from the measurement of the concentration of methanol in the vapor generated over the surface of the fuel, comprises: (i) a chamber where the vapor pressure generated by the evaporator is contained; (ii) an evaporator that allows a temperature control by a resistor; (iii) a solenoid valve that controls the inlet and outlet of the steam flow in the chamber; (iv) a methanol sensor that measures the concentration of this substance in the gas; (v) a microprocessor which controls both the evaporator temperature and the control system ignition point; and (vi) a bus wire that sends signals from the methanol sensor to the control system.