Abnormality determining apparatus for air-fuel ratio sensor
US-8965662-B2 · Feb 24, 2015 · US
System and method for flexible fuel ethanol concentration and hardware malfunction detection
US9470669B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9470669-B2 |
| Application number | US-201314102559-A |
| Country | US |
| Kind code | B2 |
| Filing date | Dec 11, 2013 |
| Priority date | Dec 11, 2013 |
| Publication date | Oct 18, 2016 |
| Grant date | Oct 18, 2016 |
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Abstract
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A system and method for flexible fuel ethanol concentration and hardware malfunction detection compares a current hardware reference value learned based on an air-fuel ratio detected during a pre-fuel mix period with a previous hardware reference value from a previous vehicle driving cycle, and detects a hardware malfunction when a difference between current and previous hardware reference values exceeds a predetermined threshold. The system and method also monitors the air-fuel ratio during a post-fuel mix period, and detects a hardware malfunction when the air-fuel ratio changes by more than a predetermined threshold during the post-fuel mix period. The system and method also compares an observed slope of the air-fuel ratio detected during a fuel mixing period over an amount of fuel consumed with an expected slope when a cold-start is detected, and detects a hardware malfunction when a difference between observed and expected slopes exceeds a predetermined threshold.
First claim
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What is claimed is: 1. A method for determining a flexible fuel ethanol concentration and detecting a hardware malfunction, comprising: detecting whether a refuel event has occurred; and when occurrence of the refuel event is detected, performing a primary ethanol concentration and hardware malfunction determination, said primary ethanol concentration and hardware malfunction determination including: detecting an air-fuel ratio during a pre-fuel mix period and learning the air-…
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Physics · mapped topic
Mechanical Engineering · mapped topic
- G01N33/0004Primary
Physics · mapped topic
Mechanical Engineering · mapped topic
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- What does patent US9470669B2 cover?
- A system and method for flexible fuel ethanol concentration and hardware malfunction detection compares a current hardware reference value learned based on an air-fuel ratio detected during a pre-fuel mix period with a previous hardware reference value from a previous vehicle driving cycle, and detects a hardware malfunction when a difference between current and previous hardware reference valu…
- Who is the assignee on this patent?
- Honda Motor Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification G01N33/0004. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Oct 18 2016 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).