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Methods and systems for adjusting egr based on an impact of pcv hydrocarbons on an intake oxygen sensor

An intake oxygen sensor, hydrocarbon technology, applied in charging systems, electrical controls, exhaust gas recirculation, etc., to solve problems such as confusion, EGR measurement and/or control degradation, sensor accuracy reduction, etc.

Active Publication Date: 2015-10-14
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, sensor measurements may be confounded by various sensitivities, sensor accuracy may be reduced, and EGR measurement and / or control may be degraded

Method used

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  • Methods and systems for adjusting egr based on an impact of pcv hydrocarbons on an intake oxygen sensor
  • Methods and systems for adjusting egr based on an impact of pcv hydrocarbons on an intake oxygen sensor
  • Methods and systems for adjusting egr based on an impact of pcv hydrocarbons on an intake oxygen sensor

Examples

Experimental program
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Embodiment 200

[0042] Embodiment 200 shows fuel tank 218 configured to deliver fuel to engine fuel injectors. A fuel pump (not shown) submerged in fuel tank 218 may be configured to pressurize fuel delivered to injectors of engine 10 , such as injector 166 . Fuel may be pumped into the fuel tank from an external source through a fueling door (not shown). Fuel tank 218 may hold a variety of fuel blends, including fuel with a range of alcohol concentrations, such as various gasoline-ethanol blends, including E10, E85, gasoline, etc., and combinations thereof. A fuel level sensor 219 located in fuel tank 218 may provide an indication of the fuel level to controller 12 . As shown, fuel level sensor 219 may include a float connected to a variable resistor. Alternatively, other types of fuel level sensors may be used. One or more other sensors may be coupled to fuel tank 218 , such as fuel tank pressure sensor 220 for estimating fuel tank pressure.

[0043] Vapors generated in fuel tank 218 ma...

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PUM

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Abstract

Methods and systems are provided for estimating an impact of PCV hydrocarbons on an output of an intake oxygen sensor. In one example, a method may include disabling EGR flow when the impact of PCV hydrocarbons on the output of the intake oxygen sensor is above a threshold. The impact of the PCV hydrocarbons on the output of the intake oxygen sensor may be based on a difference between the output of the intake oxygen sensor and a DPOV sensor when EGR is flow and a difference between the output of the intake oxygen sensor and expected blow-by when EGR is not flowing.

Description

technical field [0001] The present invention generally relates to a gas composition sensor included in the intake system of an internal combustion engine. Background technique [0002] Engine systems can take advantage of the recirculation of exhaust gas from the engine's exhaust system to the engine's intake system (intake passage), a process known as exhaust gas recirculation (EGR), to reduce regulated emissions and improve fuel economy. The EGR system may include various sensors to measure and / or control EGR. As one example, an EGR system may include an intake gas composition sensor, such as an oxygen sensor, that may be used to determine the oxygen content of fresh intake air during non-EGR conditions. During EGR conditions, the sensor can be used to infer EGR based on changes in oxygen concentration due to the addition of EGR as a diluent. An example of such an intake oxygen sensor is shown in US6742379 by Matsubara et al. The EGR system may additionally or optionall...

Claims

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Application Information

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IPC IPC(8): F02D41/00
CPCF02D41/144F02D41/0052F02D41/1454F02D41/0047F02D2200/023F02D2250/11F02M25/08F02D21/08F02M26/00Y02T10/40F01M13/00
Inventor G·苏妮拉J·A·希尔迪奇S·B·史密斯M·H·谢尔比T·A·瑞帕森M·哈基姆
Owner FORD GLOBAL TECH LLC