Methods and system for exhaust gas recirculation estimation via an exhaust oxygen sensor
US-9920699-B1 · Mar 20, 2018 · US
Methods and systems for open loop and closed loop control of an exhaust gas recirculation system
US10024254B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10024254-B2 |
| Application number | US-201715703032-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 13, 2017 |
| Priority date | Nov 5, 2015 |
| Publication date | Jul 17, 2018 |
| Grant date | Jul 17, 2018 |
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Abstract
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Methods and systems are provided for estimating exhaust gas recirculation (EGR) flow in an engine including an EGR system. In one example, a method may include operating the EGR system in an open loop feed forward mode based on an intake carbon di oxide sensor output above a threshold engine load and/or when a manifold absolute pressure (MAP) is above a threshold pressure, and operating the EGR system in a closed loop feedback mode based on a differential pressure sensor output when the engine load decreases below the threshold load and/or when the MAP decreases below the threshold pressure.
First claim
Opening claim text (preview).
The invention claimed is: 1. A method for an engine, comprising: during a first condition, operating an EGR valve based on an error between a desired DP sensor output and a measured DP sensor output, and adjusting spark timing based on the measured DP sensor output; and during a second condition, operating the EGR valve independent of the DP sensor output, and adjusting spark timing based on an intake carbon dioxide sensor voltage. 2. The method of claim 1 , wherein the first condition includes an engine load below a threshold load, and the second condition includes the engine load above the threshold load, the threshold load based on the EGR valve being in a fully open position. 3. The method of claim 2 , further comprising, during a first transition event from the first condition to the second condition, ramping the EGR valve to the fully open position while adjusting spark timing based on an assumed fully open EGR valve position and the intake carbon dioxide sensor voltage; and wherein operating the EGR valve independent of the DP sensor output includes operating the EGR valve in the fully open position. 4. The method of claim 3 , further comprising, during a second transition event from the second condition to the first condition, ramping the EGR valve from the fully open position to a less open position based on a desired EGR while adjusting spark timing based on the assumed fully open EGR valve position and the intake carbon dioxide sensor voltage; and turning off EGR system diagnostics during the second condition and during the first and second transition events. 5. The method of claim 1 , wherein the first condition includes a manifold absolute pressure (MAP) below a threshold pressure, and the second condition includes the MAP above the threshold pressure.
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Classifications
with means relating to exhaust gas recirculation, e.g. turbo · CPC title
Digital data processing · CPC title
combined with electronic control of other engine functions, e.g. fuel injection (in general F02D37/02) · CPC title
using electric actuators, e.g. solenoids · CPC title
the characteristics being temperatures, pressures or flow rates · CPC title
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- What does patent US10024254B2 cover?
- Methods and systems are provided for estimating exhaust gas recirculation (EGR) flow in an engine including an EGR system. In one example, a method may include operating the EGR system in an open loop feed forward mode based on an intake carbon di oxide sensor output above a threshold engine load and/or when a manifold absolute pressure (MAP) is above a threshold pressure, and operating the EGR…
- Who is the assignee on this patent?
- Ford Global Tech Llc
- What technology area does this patent fall under?
- Primary CPC classification F02D41/0072. Mapped technology areas include Mechanical Engineering.
- When was this patent published?
- Publication date Tue Jul 17 2018 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 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).