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

Claim 0:
1. A failure determination device, comprising:
an output unit that inputs a first digital value to a digital-to-analog conversion circuit (DA conversion circuit) and causes the DA conversion circuit to generate an analog electrical output;
an acquisition unit that acquires 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 diagnosis unit that diagnoses a failure of the DA conversion circuit based on the second digital value,
wherein the output unit increments the first digital value and inputs the first digital value to the DA conversion circuit at a first time interval,
the acquisition unit acquires the second digital value at a second time interval that is shorter than the first time interval, and
the diagnosis unit determines whether the DA conversion circuit has a failure based on signal strength of an alternating-current component (AC component) with a predetermined frequency included in a discrete signal that is the second digital value acquired at the second time interval.