Patent ID: 7188024
Filing Date: 2007-03-06
Classification: F02D,G11C

Abstract:
1. An electronic control device comprising: a microprocessor that operates using electricity supplied from a battery through a switching element that is operated in conjunction with an ignition switch, and a main power supply circuit; a volatile memory for temporarily storing data to be updated, the volatile memory being operated using electricity supplied through the main power supply circuit, the electricity being also supplied from the battery constantly through an auxiliary power supply circuit so that the volatile memory retains the data by electricity supplied from the auxiliary power supply circuit even if electricity is not supplied from the main power supply circuit; initial start signal generation means for generating an initial start signal indicating that the ignition switch is turned on for the first time after electricity is supplied from the battery to the volatile memory through the auxiliary power supply circuit; and volatile memory initialization means for initializing the volatile memory according to the initial start signal when the ignition switch is turned on for the first time after electricity is supplied to the volatile memory.