Patent ID: 11909412
Assignee: HONDA MOTOR CO., LTD.
Field: Measurement (Instruments)
Classification: CPC F  H  G | IPC F  G  H

Claim 9:
10. A failure determination method for a DA conversion circuit executed by a computer of a failure determination device for the DA conversion circuit, the method comprising:
a step of inputting a first digital value to the DA conversion circuit and causing the DA conversion circuit to generate an analog electrical output;
a step of acquiring a second digital value corresponding to a difference between the analog electrical output of the DA conversion circuit and a target analog electrical output indicated by the first digital value; and
a step of diagnosing a failure of the DA conversion circuit based on the second digital value,
wherein the step of inputting increments the first digital value and inputs the incremented value to the DA conversion circuit at a first time interval,
the step of acquiring acquires the second digital value at a second time interval, the second time interval being shorter than the first time interval, and
the step of diagnosing determines whether the DA conversion circuit has a failure based on signal strength of an AC component with a predetermined frequency included in a discrete signal, the discrete signal being the second digital value acquired at the second time interval.