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Methods and systems for boost control

A charge air cooling and compressor technology, applied in electrical control, charging system, engine control, etc., can solve the problem of not solving the temperature limit of the compressor

Active Publication Date: 2015-02-25
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This approach also does not address the compressor temperature limit issue

Method used

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  • Methods and systems for boost control
  • Methods and systems for boost control
  • Methods and systems for boost control

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Embodiment Construction

[0016] The following description pertains to use in supercharged engine systems (e.g., figure 1 system) A system and method for regulating a proportional charge of compressed air recirculated from downstream of a charge air cooler to a compressor inlet. The controller can be configured to execute control routines such as Figure 5 routine to adjust the amount of cooled compressed air charge recirculated from downstream of the charge air cooler based on surge and condensation factors relative to the amount of EGR. Wherein the controller may adjust these quantities based on the compressor inlet temperature and also based on the EGR so that the temperature and humidity of the air charge entering the compressor remains above thresholds where condensation will occur. The controller can also adjust these quantities based on indications of compressor surge to improve surge limiting margins. as in Figure 5 Specifically, the controller may select between utilizing increased hot EGR...

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Abstract

Methods and systems are provided for managing a compressor temperature using EGR to address surge and condensation. A variable mixture of cooled compressor recirculation flow and hot EGR is provided to a compressor inlet. A composition of the mixture is adjusted to maintain a compressor inlet temperature sufficiently warm so as to reduce ingestion of condensation, and a compressor outlet temperature sufficiently cold to be within component temperature limits with flow above the surge limit.

Description

technical field [0001] The present application relates to methods and systems for adjusting compressor recirculation flow and EGR to improve boost control. Background technique [0002] Engine systems may be configured with a boosting device, such as a turbocharger, to provide a boosted air charge and improve peak power output. Where energy from the exhaust flow is used to spin a turbine which in turn drives a compressor delivering a boosted air charge to the engine intake. In an effort to meet stringent federal government fuel economy standards, engine systems may also be equipped with exhaust gas recirculation (EGR) systems in which at least a portion of exhaust gas is recirculated to the engine intake. For example, the EGR system may be a low-pressure EGR system (LP-EGR) that recirculates exhaust gas from downstream of the exhaust turbine to upstream of the exhaust compressor. Benefits of EGR include increased engine dilution, reduced exhaust emissions, and improved fue...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02B37/12
CPCF02M25/07F02B29/0437F02D41/0007F02D41/0065F02D2041/0067F02D2200/0418F02M26/06F02M26/07F02M26/25F02M26/44F02M26/47Y02T10/12Y02T10/40
Inventor J·N·阿勒瑞J·H·巴克兰
Owner FORD GLOBAL TECH LLC