Patent ID: 8583323
Filing Date: 2013-11-12
Classification: B60L

Abstract:
1. A vehicle-use electronic control device including at least one function circuit and a power supply to generate an operating voltage of the function circuit from a battery voltage of a battery mounted on a vehicle, and supply the operating voltage to the function circuit, comprising: a first microcomputer configured to be in a normal operation mode to operate normally while a predetermined start condition is satisfied, and to be in a sleep mode where a consumption current thereof is smaller than in the normal operation mode while a predetermined standby condition is satisfied; a clock unit configured to clock a current time to provide current time information indicating at least the current time; a use detection unit configured to detect use of the vehicle in a predetermined use state; a prediction unit configured to acquire the current time information from the clock unit when the use detection unit detects use of the vehicle, and performs a predictive calculation to calculate a frequent use time period in which frequency of use of the vehicle is high based on the acquired time information; and a storage memory configured to store the calculated frequent use time period; wherein the first microcomputer outputs a power shut off command to the power supply instructing to shut off supply of the operating voltage to the first microcomputer when the first microcomputer is in the sleep mode and the frequent use time period does not prevail, and informs the clock unit of a start time of a next frequent use time period referring to stored contents of the storage memory, the clock unit outputs a start signal to the power supply when the start time informed from the first microcomputer is reached, the power supply shuts off supply of the operating voltage to the first microcomputer upon reception of the power shut off command from the first microcomputer, and starts supply of the operating voltage to the first microcomputer upon reception of the start signal from the clock unit, and the clock unit is disposed outside and separately from the first microcomputer.