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Method and system for air fuel ratio control and detecting cylinder imbalance

A technology of air-fuel ratio and exhaust air-fuel ratio, which is applied in the direction of fuel injection control, electrical control, automatic control, etc., and can solve problems such as cylinder air/fuel imbalance

Active Publication Date: 2016-05-04
FORD GLOBAL TECH LLC
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  • Abstract
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Problems solved by technology

[0005] In one example, the problems described above may be addressed by a method for adjusting engine operation in response to a cylinder air / fuel imbalance

Method used

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  • Method and system for air fuel ratio control and detecting cylinder imbalance
  • Method and system for air fuel ratio control and detecting cylinder imbalance
  • Method and system for air fuel ratio control and detecting cylinder imbalance

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Embodiment Construction

[0015] Hereinafter, a diagnosis method and a diagnosis system of an engine system will be described in more detail with reference to the accompanying drawings. Note that the embodiment described below is an illustrative example, and various alternative embodiments may also be used.

[0016] figure 1 The illustration shows a schematic diagram of an engine system 100 including one cylinder of a multi-cylinder engine 10 that may be included in a propulsion system of an automobile. Engine 10 may be controlled at least partially by a control system including controller 12 and by input from a vehicle operator 132 via an input device 130 . In this example, input device 130 includes an accelerator pedal and a pedal position sensor 134 for generating a proportional pedal position signal PP. Combustion chamber (ie, cylinder 30 ) of engine 10 may include combustion chamber walls 32 with piston 36 positioned therein. Piston 36 may be coupled to crankshaft 40 such that rotational motion...

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Abstract

Air / fuel imbalance monitoring systems and methods for monitoring air / fuel ratio imbalance of an internal combustion engine are disclosed. In one embodiment, adjusting engine operation responsive to cylinder air / fuel imbalance based on a determined total number of instances where sensed peak-to-peak exhaust air-fuel ratios differentials are less than a threshold normalized to a total number of peak-to-peak oscillations. The approach can be used to indicate air / fuel ratio imbalances between engine cylinders.

Description

technical field [0001] The present description generally relates to methods and systems for detecting cylinder combustion imbalances in an engine. Background technique [0002] The engine air-fuel ratio may be maintained at a desired level (eg, stoichiometric) in order to provide desired catalyst performance and reduce emissions. Typical feedback air-fuel ratio control involves monitoring exhaust oxygen concentration via one or more exhaust gas sensors and adjusting fuel and / or charge air parameters to meet a target air-fuel ratio. However, this feedback control may ignore changes in the air-fuel ratio among cylinders, which may degrade engine performance and emissions. While various approaches have been proposed for individual cylinder air / fuel control with the goal of reducing cylinder-to-cylinder air-fuel ratio variation, such variation may still exist, as the inventors have recognized. For example, problems with cylinder air-fuel ratio imbalances may include increased ...

Claims

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Application Information

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IPC IPC(8): F02D41/04F02B77/08F02P5/15
CPCF02D41/0085F02D41/1441F02D41/1454F02D41/1456F02D41/22F02D41/38F02P5/045F02P5/1512F02D41/0007F02D37/02Y02T10/40F01N11/00F02D41/1444
Inventor A·莱门D·J·麦克尤恩A·N·班克
Owner FORD GLOBAL TECH LLC
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