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Methods and systems for fuel canister purge flow estimation with an intake oxygen sensor

A technology of intake oxygen sensor and fuel tank, applied in the direction of charging system, fuel injection control, adding non-fuel substances to fuel, etc., can solve the problems of reducing the accuracy of EGR measurement and/or control, and reducing the accuracy of sensors

Active Publication Date: 2015-07-15
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 can be disturbed by different sensitivities, reducing the accuracy of the sensor and thus reducing the accuracy of EGR measurement and / or control

Method used

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  • Methods and systems for fuel canister purge flow estimation with an intake oxygen sensor
  • Methods and systems for fuel canister purge flow estimation with an intake oxygen sensor
  • Methods and systems for fuel canister purge flow estimation with an intake oxygen sensor

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Experimental program
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Embodiment 200

[0033] Embodiment 200 shows fuel tank 218 configured to deliver fuel to engine fuel injectors. A fuel pump (not shown) submerged within fuel tank 218 may be configured to pressurize fuel delivered to injectors of engine 10 , such as injector 166 . Fuel may be pumped from an external source to the fuel tank through a fuel refill door (not shown). Fuel tank 218 may hold a variety of blended fuels, including fuels of 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 within fuel tank 218 may provide an indication of the fuel level to controller 12 . As depicted, 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 transducer 220 , for estimating fuel tank pressure.

[0034] Vapors generated...

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PUM

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Abstract

Methods and systems are provided for estimating a fuel canister purge flow based on outputs of an intake manifold oxygen sensor. For example, during boosted engine operation when exhaust gas recirculation (EGR) is flowing below a threshold and purge is enabled, purge flow may be estimated based on changes in the sensor output while modulating a canister purge valve between an open and closed position. Then, during subsequent operation wherein EGR and purge flow are enabled, the output of the sensor may be adjusted based on the estimated purge flow.

Description

technical field [0001] The present application generally relates to gas composition sensors included within the intake system of an internal combustion engine. Background technique [0002] Engine systems can utilize the recirculation of exhaust gas from the engine exhaust system to the engine intake system (intake passage), known as the exhaust gas recirculation (EGR) process, to reduce regulatory emissions and / or improve fuel economy . EGR systems 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 during non-EGR conditions to determine the oxygen content of fresh intake air. During EGR conditions, sensors may 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 US 6,742,379 (Matsubara et al.). The EGR system may additionally or optionally in...

Claims

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Application Information

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IPC IPC(8): F02D41/00
CPCF02M25/0836F02M26/40
Inventor C·W·维吉尔德J·H·巴克兰
Owner FORD GLOBAL TECH LLC