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Methods and system for engine control

An engine and fuel injector technology, applied in the direction of engine control, machine/engine, electrical control, etc., can solve problems such as fuel injector degradation, and achieve the effect of reducing false disables and reducing air-fuel imbalance

Active Publication Date: 2018-03-06
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, if the air-fuel error is at least partially due to common error, the air-fuel error will persist even after the transfer letter of the fuel injector is adjusted
Additionally, common errors can cause fuel injectors to appear degraded

Method used

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  • Methods and system for engine control
  • Methods and system for engine control
  • Methods and system for engine control

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Embodiment Construction

[0019] The following description relates to systems and methods for determining air-fuel error in an internal combustion engine having cylinders fueled by direct fuel injection and port fuel injection. figure 1 Engine cylinders fueled via direct fuel injection and port fuel injection are depicted. Figure 2A An example table of adaptive fuel multiplier values ​​is shown. Adaptive fuel multipliers may be used to indicate air-fuel error in engines with direct and port fuel injectors. Figure 2B Shown are the ratios for determining the direct fuel injector error and the port fuel injector error as the change in the adaptive fuel multiplier value relative to the fraction of fuel injected via direct fuel injection and port fuel injection, respectively. Sample graphical output. Figure 2C An example table of adaptive fuel multipliers used to determine common errors in engines operating at different speeds and loads is shown. If the value of the adaptive fuel multiplier exceeds th...

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Abstract

The invention relates to methods and system for engine control. Systems and methods for determining air-fuel error in an engine fueled via direct and port fuel injection. Errors associated with individual fuel injection systems are distinguished from a common error based on trends in the error correction coefficients of the individual fuel injection systems. Adaptive fuel multipliers for each injection system are updated to account for the common error.

Description

technical field [0001] The present invention relates to systems and methods for determining fuel injector errors in internal combustion engines. Background technique [0002] Dual fueling engine systems having direct and port fuel injectors may be configured to operate over a wide range of engine operating conditions. For example, at higher engine speeds and loads, fuel may be injected directly into engine cylinders to increase engine torque and improve cooling of the cylinder charge while minimizing the possibility of engine knock. At lower engine speeds and loads, fuel may be injected via port fuel injection to reduce particulate matter emissions. Specifically, port injected fuel may vaporize rapidly when fuel is drawn into engine cylinders, thereby reducing particulate matter buildup while improving fuel efficiency. Fuel may be injected into the engine during moderate speeds and loads via both direct fuel injection and port fuel injection in order to improve combustion ...

Claims

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Application Information

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IPC IPC(8): F02D41/30F02D41/14
CPCF02D41/1454F02D41/3094F02D41/2467F02D35/0092F02D41/26F02D41/402F02D2041/389
Inventor A·P·R·龙高G·苏尔尼拉J·L·托马斯E·D·桑伯恩M·T·利嫩伯格K·J·贝洱
Owner FORD GLOBAL TECH LLC