Reprogramming system and electronic control unit for hybrid vehicle

摘要

A reprogramming system such as an electric control unit (ECU) mounted on a hybrid vehicle so controls that an auxiliary battery is charged from the main battery when a voltage of the auxiliary battery is lower than an executable voltage which is a necessary voltage of adequately performing a reprogramming process. Further, the ECU controls that the main battery is charged when the voltage of the main battery is lower than a chargeable voltage which is a necessary voltage of adequately charge the auxiliary battery with an electric power. A reprogramming system mounted on the hybrid vehicle performs the reprogramming process of replacing a program stored in an internal memory unit of the ECU with a new program transferred from a reprogramming device when the voltage of the auxiliary battery is not less than an executable voltage.