Patent ID: 8384240
Filing Date: 2013-02-26
Classification: F02D,G04R

Abstract:
1. A power supply control device used in an electric control unit of electric equipment for a vehicle and including a voltage generating section that generates voltages used at least for a signal process for clocks required in electric devices included in the electric equipment for vehicles and a data process for backup storage from a battery voltage connected eternally, the power supply control device further comprising: a reference voltage generating section as the voltage generating section that generates a reference voltage from the battery voltage supplied when an ignition switch is turned ON; a primary voltage generating section as the voltage generating section that generates a primary voltage from the battery voltage; a secondary voltage generating section as the voltage generating section that generates a secondary voltage from the primary voltage; an internal clock generating section that generates an internal clock signal; a GPS receiving section that receives a GPS radio wave; a clock extracting section that extracts a GPS clock signal from the GPS radio wave; a clock monitoring section that monitors the GPS clock signal; a clock switching section that selects between the internal clock signal and the GPS clock signal; a hold-over section that self-maintains clock accuracy of the selected signal of the internal clock signal and the GPS clock signal; a time management section that measures and administrates the time; a radio wave receiving section that receives a standard radio wave including a reference present time data; an ignition key off time measuring section that measures ignition key off time; and a voltage application control section that applies the secondary voltage to the electric devices during a setting period of the ignition key off and stops application of the secondary voltage after passage of a stop period set after activation of the electric devices, wherein the time management section has a time correcting function to correct the present time data of the standard radio wave based on the clock accuracy self-maintained with the hold-over section.