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Low-pressure EGR control during compressor bypass valve operation

一种压缩机、旁通阀的技术，应用在发动机操作、发动机控制、电气控制等方向，能够解决发动机性能衰退、不能实现进气空气稀释等问题

Active Publication Date: 2014-07-23
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Thus, if no action is taken to address this issue, the desired dilution of intake air may not be achieved and engine performance may degrade

Method used

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  • Low-pressure EGR control during compressor bypass valve operation
  • Low-pressure EGR control during compressor bypass valve operation
  • Low-pressure EGR control during compressor bypass valve operation

Examples

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Embodiment Construction

[0010] The following description relates to controlling LP EGR during CBV operation in an internal combustion engine. Such as figure 1 As shown in the exemplary embodiment of , an engine system may include two branches, each branch having a turbocharger and an EGR system. An intake oxygen sensor placed downstream of the compressor can measure the dilution of the intake air, which can be used as a basis for adjusting CBV and EGR, as described in the figure 2 and 3 The procedure is described in detail. For example, if figure 2 and 3 As shown, when the CBV is open, the EGR valve may be closed to avoid excessive dilution of the intake charge. Such as Figure 4 As shown in the timing diagram of , once the CBV closes (for example, due to compressor surge risk estimates falling below a threshold), and once the measured intake air dilution reflects that the intake system contains little or no EGR, then EGR may be increased as needed to achieve the desired dilution of intake a...

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PUM

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Abstract

The invention relates to low-pressure EGR control during compressor bypass valve operation. A turbocharged engine system including a low-pressure exhaust gas recirculation (EGR) system and an intake oxygen sensor is described, along with methods for its operation. The system includes a compressor bypass valve arranged in a passage bypassing a turbocharger compressor, and an EGR valve arranged in an EGR system which may be adjusted to adjust an amount of exhaust gas recirculated to the engine intake. In one example method, over-dilution of an engine intake charge may be reduced by reducing EGR upon opening of the compressor bypass valve, and then increasing the EGR only after measurements from an intake oxygen sensor indicate that intake air dilution has decreased below a threshold.

Description

technical field [0001] The present application relates to controlling low pressure exhaust gas recirculation during operation of a compressor bypass valve of an internal combustion engine. Background technique [0002] Engine systems can utilize the recirculation of exhaust gas from the engine exhaust system to the engine intake system, a process called exhaust gas recirculation (EGR), to reduce regulated emissions. For example, a turbocharged engine system may include a low pressure (LP) EGR system that recirculates exhaust gas from the exhaust system to the intake upstream of the turbocharger compressor. Exhaust gas may thus be recirculated to the low pressure air intake system (LP AIS) upstream of the compressor, resulting in a compressed mixture of fresh intake air and EGR downstream of the compressor. The EGR valve may be controlled to achieve a desired dilution of intake air based on engine operating conditions. [0003] But turbocharged engine systems may also inclu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M25/07
CPCF02B37/16F02B47/08F02B2037/125F02D41/0007F02D41/005F02D41/144F02M26/06Y02T10/12Y02T10/40
Inventor J·A·希尔迪奇G·苏尼拉D·J·斯泰尔斯
Owner FORD GLOBAL TECH LLC
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