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Methods of improving blow-by and egr by separating exhaust

An exhaust valve, exhaust turbine technology used to separate exhaust. It can solve problems such as increasing fuel consumption, affecting emissions, increasing pumping losses, etc.

Inactive Publication Date: 2020-06-19
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, an EGR throttle can be placed in the intake, upstream of the compressor, to enhance EGR flow at low back pressure, which can make the turbocharger more sensitive to surge and increase pumping loss
Furthermore, in examples where blowby techniques are used to reduce knock, the additional fuel injected to bring the exhaust to stoichiometry can cause overheating of the catalyst and affect emissions while increasing fuel consumption
Additionally, engine efficiency can degrade at lower engine loads and EGR can contribute to combustion instabilities

Method used

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  • Methods of improving blow-by and egr by separating exhaust
  • Methods of improving blow-by and egr by separating exhaust
  • Methods of improving blow-by and egr by separating exhaust

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Embodiment Construction

[0024] The following description refers to a method for controlling an engine such as Figure 1 to Figure 2 Systems and methods for detonation in an engine system). Specifically, within a combustion cycle, a first or bled portion of the exhaust gas may be directed via a first passage to the turbine of the turbocharger and a second or scavenged portion of the exhaust may be directed via a second passage to the exhaust The control device and a third portion of the exhaust gas towards the end of the exhaust stroke mixed with the leaked air may be directed through the third passage to the inlet of the compressor in the turbocharger. Thus, each cylinder of the engine may include five valves / valves: two intake valves, two exhaust valves, and a compressor inlet valve. The engine controller can be configured to execute control programs such as Figure 4 program), thus based on the Figure 5 Operate the compressor inlet valve for the various engine operating conditions shown in . C...

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Abstract

The invention relates to a method to improve blowthrough and EGR via split exhaust. Methods and systems are provided for a boosted engine having a split exhaust system. In one example, a method comprises directing exhaust from a first cylinder group to one or more of a pre-compressor location, a post-compressor location, and an exhaust turbine, and directing exhaust from a second cylinder group to one or more of the pre-compressor location, and the exhaust turbine. Engine efficiency and knock control may be enhanced by directing exhaust gases to different locations based on engine operating conditions.

Description

[0001] Cross References to Related Applications [0002] This application is a continuation-in-part of U.S. Patent Application No. 14 / 157,167, filed January 16, 2014, entitled "METHODTO IMPROVE BLOWTHROUGH VIA SPLIT EXHAUST", the entire contents of which are Incorporated by reference for all purposes. technical field [0003] The present application relates to split exhaust in the exhaust system of a boosted internal combustion engine. Background technique [0004] Engines may use boosting devices such as turbochargers to increase engine power density. However, engine knock may occur due to increased combustion temperatures. Engine knock can be addressed by retarding spark timing; however, significant spark retard can reduce fuel economy and limit peak torque. Knocking is particularly problematic under boost conditions due to the high charge temperature. [0005] One way to reduce charge temperature, and thus knock, is via blowthrough during the positive valve overlap ph...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02M26/09F02M26/43F02M26/44F02M26/14F02M26/17F02M26/16F02M26/38F01N13/10F02D41/00F02D41/06F02D41/10F02D41/08F02D13/02F02D21/08F02D41/38F02D9/00
CPCF01N13/107F02D9/00F02D13/0249F02D13/0257F02D13/0261F02D13/0276F02D21/08F02D41/0007F02D41/0077F02D41/0082F02D41/062F02D41/064F02D41/08F02D41/10F02D41/3809F02D2041/001F02D2041/0022F01N3/08F02D13/0207F02D13/0246F02M26/05F02M26/07F02M26/44Y02T10/12
Inventor D·P·麦迪逊J·N·尤瑞B·A·博伊尔
Owner FORD GLOBAL TECH LLC