Patent ID: 9670859
Date: 2017-06-06
CPC Classifications: F02D,Y02T

Claim:
1. An electronic control unit comprising: a control portion including a nonvolatile storage portion and supplied with power when a power switch is in an on-state and stops a processing while the power switch is in an off-state; wherein the power switch is different from an ignition switch; a soak timer supplied with power regardless of an on-off state of the power switch, the soak timer counting a soak timer value while the power switch is in the off-state and turning on the power switch at fixed intervals based on the soak timer value, thereby activating the control portion, and an interface performing a data communication with a clock device which is disposed outside of the electronic control unit, wherein the interface transmits data of the data communication to the nonvolatile storage portion, the nonvolatile storage portion keeps the data even when the power switch is turned off, the control portion has an abnormality diagnostic function of detecting an abnormality in the soak timer value counted by the soak timer, the control portion acquires first time information of the clock device when the power switch is turned off and stores the first time information in the nonvolatile storage portion, and the control portion acquires second time information of the clock device when the soak timer activates the control portion or when the control portion receives an activation request, calculates a first time difference between the second time information and the first time information stored in the nonvolatile storage portion, and determines an abnormality of the soak timer based a difference between the first time difference and the soak timer value counted by the soak timer.