Control system for diagnosing a malfunctioning of a pressure sensor included in an aftertreatment system of an internal combustion engine
US-2016341142-A1 · Nov 24, 2016 · US
Failure diagnosis device for exhaust brake
US9726086B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-9726086-B2 |
| Application number | US-201414787612-A |
| Country | US |
| Kind code | B2 |
| Filing date | Jul 8, 2014 |
| Priority date | Jul 10, 2013 |
| Publication date | Aug 8, 2017 |
| Grant date | Aug 8, 2017 |
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Abstract
Official abstract text for this publication.
On the basis of absolute values α and β of variations, before and after actuation of an exhaust brake, of fuel-injection and intake-air amounts, respectively, an exhaust brake is determined to normally operate when the absolute values α and β of the variations of the fuel-injection and intake-air amounts are not less than fuel-injection and intake-air variation thresholds, respectively; the exhaust brake is determined to have failure when the absolute values α and β of the variations of the fuel-injection and intake-air amounts are less than the fuel-injection and intake-air variation thresholds, respectively.
First claim
Opening claim text (preview).
The invention claimed is: 1. A device for diagnosing failure of an exhaust brake, comprising: a diagnosis circuit for determining, on the basis of absolute values of variations, before and after actuation of said exhaust brake, of fuel-injection and intake-air amounts, respectively, that the exhaust brake normally operates when the absolute value of the variation, before and after the actuation of said exhaust brake, of the fuel-injection amount is not less than a fuel-injection variation threshold and the absolute value of the variation, before and after the actuation of said exhaust brake, of the intake-air amount is not less than an intake-air variation threshold and determining that said exhaust brake has a failure when the absolute value of the variation, before and after the actuation of said exhaust brake, of said fuel-injection amount is less than the fuel-injection variation threshold and the absolute value of the variation, before and after the actuation of said exhaust brake, of said intake-air amount is less than the intake-air variation threshold, wherein upon determining that said exhaust brake has the failure, an exhaust flow rate is throttled to rise a temperature of an aftertreatment device for exhaust emission control incorporated in an exhaust pipe of an engine to a required temperature during idling. 2. The device for diagnosing failure of the exhaust brake as claimed in claim 1 , wherein said diagnosis circuit sets a first diagnosis-avoidance zone where no diagnosis is made when the absolute value of the variation of said fuel-injection amount is not less than the fuel-injection variation threshold and the absolute value of the variation of said intake-air amount is less than the intake-air variation threshold as well as a second diagnosis-avoidance zone where no diagnosis is made when the absolute value of the variation of said fuel-injection amount is less than the fuel-injection variation threshold and the absolute value of the variation of said intake-air amount is not less than the intake-air variation threshold.
Assignees
Inventors
Classifications
- F02D9/06Primary
Exhaust brakes · CPC title
Control of exhaust back pressure, e.g. for turbocharged engines · CPC title
relating to the failure of actuators or electrically driven elements · CPC title
the fuel injection being cut-off · CPC title
Actual fuel mass or fuel injection amount · CPC title
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- What does patent US9726086B2 cover?
- On the basis of absolute values α and β of variations, before and after actuation of an exhaust brake, of fuel-injection and intake-air amounts, respectively, an exhaust brake is determined to normally operate when the absolute values α and β of the variations of the fuel-injection and intake-air amounts are not less than fuel-injection and intake-air variation thresholds, respectively; the exh…
- Who is the assignee on this patent?
- Hino Motors Ltd
- What technology area does this patent fall under?
- Primary CPC classification F02D9/06. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Aug 08 2017 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 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).