Failure determination device, control device, and failure determination method
AssigneeHonda Motor Co., Ltd.
InventorYasunari Sato
Life of this patent
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Abstract
A failure determination device: acquires a second digital value indicating a difference between an analog electrical output generated by inputting a first digital value incremented at a first time interval to a DA conversion circuit and a target output indicated by the first digital value at a second time interval; and determines whether the DA conversion circuit has a failure based on a signal strength in a predetermined frequency of the second digital value that is a discrete signal.
Claims10
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.
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.
Dependencies are inferred from the claim text.