Supercharge Your Innovation With Domain-Expert AI Agents!

Method and system for determining air-fuel imbalance

An air and fuel technology, applied in fuel injection control, electrical control, machine/engine, etc., can solve problems such as excessive emissions, achieve the effects of reducing exhaust emissions, reducing air and fuel changes between cylinders, and improving fuel efficiency

Active Publication Date: 2017-12-12
FORD GLOBAL TECH LLC
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this intrusive approach can lead to excess emissions

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method and system for determining air-fuel imbalance
  • Method and system for determining air-fuel imbalance
  • Method and system for determining air-fuel imbalance

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] The following description relates to systems and methods for identifying inter-cylinder imbalances in a vehicle engine operating with variable displacement. Thus, a variable displacement engine (VDE), such as Figure 1-2 The engine depicted in , is capable of switching between operation with all or some cylinders firing by selectively deactivating fuel and spark and varying the operation of the intake and exhaust valves of selected cylinders. figure 2 A partial view of a single cylinder in a multi-cylinder engine system is shown. The engine controller can be configured to execute routines such as Figure 3-4 An example routine for timely estimating an inter-cylinder air-fuel imbalance parameter during a VDE mode of variable displacement engine operation. Figure 5 An example routine is shown that may be used by a controller to identify inter-cylinder air-fuel imbalances based on a composite indicator by weighting air-fuel ratio-based imbalances using a first confiden...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

Methods and systems are provided to determine air-fuel imbalance of cylinders in a variable displacement engine. In one example, the method may include during a cylinder deactivation event, sequentially deactivating each cylinder of a cylinder group including two or more cylinders and estimating a lambda deviation for each cylinder following the sequential deactivation of each cylinder of the cylinder group; and learning an air error for each cylinder based on the estimated lambda deviation.

Description

[0001] Cross References to Related Applications [0002] This patent application claims priority to U.S. Provisional Patent Application No. 62 / 344,777, filed June 2, 2016, entitled "Method and System for Determining Air-Fuel Imbalance." The entire contents of the above-referenced applications are hereby incorporated by reference in their entirety for all purposes. technical field [0003] The present invention generally relates to methods and systems for determining a cylinder air-fuel imbalance in an internal combustion engine of a vehicle. Background technique [0004] Engine emissions compliance requires accurate detection of air-fuel imbalances between engine cylinders. An air-fuel imbalance between engine cylinders can occur due to a variety of factors. For example, there may be an imbalance between cylinders due to air leaking from some cylinders, exhaust gas recirculation errors, plugged intake valves, misfiring fuel injectors, and faulty exhaust gas sensors. In ad...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): F02D41/00F02D17/02
CPCF02D17/02F02D41/0085F02D2200/08F02D2200/0814F02D2200/1002F02D41/0087F02D41/1456F02D41/1495F02D41/2454F02D41/123F02D41/1454F02D41/26F02D41/3005
Inventor D·R·马丁A·M·杜达尔R·R·延茨J·E·罗林杰
Owner FORD GLOBAL TECH LLC
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com