Patent ID: 9513679
Filing Date: 2016-12-06
CPC Classification: G06F

Claim Text:
1. An electronic control unit comprising: a microcomputer including an acquisition section, a determination section, and a time calculation section; and a monitoring section monitoring an operation of the microcomputer and outputting a reset signal to the microcomputer when the monitoring section determines that an abnormality occurs in the microcomputer, wherein the acquisition section acquires time information from outside the microcomputer, when the microcomputer starts up, the determination section determines whether the microcomputer stopped the operation due to unknown cause; and when the determination section determines that the microcomputer stopped the operation due to unknown cause, the time calculation section calculates stop time information that indicates a time during which the microcomputer stopped the operation based on the time information acquired by the acquisition section before the microcomputer stopped the operation and the time information acquired by the acquisition section after the microcomputer starts up, and stores the stop time information in a time storage portion, wherein when a power supply switch is turned on, the microcomputer is supplied with a power supply voltage and starts up, when the microcomputer detects that the power supply switch is turned off, the microcomputer stops the operation, the microcomputer further includes a history storage section, the history storage section periodically determines, as a determination result, whether the power supply switch is on or off and stores history information that indicates the determination result in a history storage portion, when the microcomputer starts up, the determination section determines whether the history information stored in the history storage portion indicates that the power supply switch is on, and when the history information indicates that the power supply switch is on, the determination section determines that the microcomputer stopped the operation due to unknown cause.