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Methods and systems for an intake oxygen sensor

An oxygen sensor and sensor technology, applied in the direction of charging system, electrical control, exhaust gas recirculation, etc., can solve the problems of sensor measurement confusion, sensor accuracy measurement and/or control loss, etc.

Active Publication Date: 2015-03-25
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, and the accuracy of the sensor and thus the measurement and / or control of EGR may be impaired

Method used

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  • Methods and systems for an intake oxygen sensor
  • Methods and systems for an intake oxygen sensor
  • Methods and systems for an intake oxygen sensor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 200

[0033] 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 (eg, to injector 166 ). Fuel may be pumped into the fuel tank from an external source via a fuel filler 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 transducer 220 for estimating fuel tank pressure.

[0034] Vapors generated in fuel tank 218...

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PUM

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Abstract

Methods and systems are provided for adjusting a reference voltage for an intake manifold oxygen sensor based on ingestion of hydrocarbons from a fuel system canister and / or an engine crankcase. During conditions when purge or crankcase ventilation hydrocarbons are ingested in the intake aircharge, the intake oxygen sensor is transitioned from operating at a lower reference voltage to a higher reference voltage where the effects of the ingested hydrocarbons on the sensor output are nullified. An EGR dilution of the intake aircharge is estimated based on the output of the sensor at the higher reference voltage while an amount of hydrocarbons ingested is estimated based on a difference between sensor outputs at the higher and lower reference voltages.

Description

technical field [0001] The present application generally relates to a gas composition sensor included in an intake system of an internal combustion engine. Background technique [0002] Engine systems can reduce regulated emissions by utilizing the recirculation of exhaust gas from the engine exhaust system to the engine intake system (intake path), a process known as exhaust gas recirculation (EGR). EGR systems may contain 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 operating conditions. During EGR conditions, the sensor may be used to infer EGR based on changes in oxygen concentration resulting from the addition of EGR as a diluent. An example of such an intake oxygen sensor is shown by Matsubara et al. in US 6,742,379. The EGR system may additionally or optionally include an exhaust ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/14
CPCF02D41/0065F02D41/0072F02D41/144F02D41/1456F02D41/1473F02D41/18F02D41/40F02P5/045F02P5/1516F02D37/02F02D41/0007F02D41/0035F02D41/0045F02D41/005F02D2041/001F02M25/089F02M26/08Y02T10/40F02M25/08
Inventor G·苏尼拉D·A·马克德J·A·希尔迪奇R·E·索蒂斯M·H·谢白D·J·斯黛奥兹
Owner FORD GLOBAL TECH LLC