Turbocharged engine control operation with adjustable compressor bypass

A turbocharger and engine technology, applied in engine control, machine/engine, engine components, etc., can solve problems such as turbocharger damage, affecting air-fuel ratio, affecting engine combustion stability, etc.

Inactive Publication Date: 2009-04-01
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The resulting "compressor surge" can cause damage to the turbocharger, and fluctuations in the air flow output from the compressor can affect the air-fuel ratio, which ultimately affects the combustion stability of the engine

Method used

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  • Turbocharged engine control operation with adjustable compressor bypass
  • Turbocharged engine control operation with adjustable compressor bypass
  • Turbocharged engine control operation with adjustable compressor bypass

Examples

Experimental program
Comparison scheme
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Embodiment Construction

[0015] Engine 10 may include a turbocharger 160 having a compressor 162 that may receive intake air from air filter 42 and discharge charge air into intake passage 44 . Compressor 162 may be connected to turbine 164 by a shaft that transmits motion of turbine 164 to compressor 162 . Compressor 162 may be fluidly connected to recirculation loop 168 , which may bypass the compressor delivering flow from air filter 42 to intake passage 44 . The recirculation loop 168 may include a bypass valve 166 . Bypass valve 166 may be controlled by controller 12 to control the recirculated air flow rate between the compressor outlet and the compressor inlet.

[0016] Turbine 164 may include a variable geometry turbine, wherein the geometry of the turbine may be adjusted by controller 12 during engine operation. Alternatively or additionally, an adjustable wastegate 150 may be used to allow controller 12 to adjust the amount of exhaust gas bypassing the turbine based on engine operating con...

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PUM

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Abstract

A method of operating an engine having a turbocharger and a high pressure EGR system is provided. In one example, a compressor of the turbocharger may have a recirculation passage with a recirculation valve coupled therein. The method may include during a first engine airflow condition: delivering at least some high pressure un-cooled EGR to the intake, downstream of the compressor, operating the throttle at a first throttle amount, and operating the compressor bypass valve at a first bypass amount to increase exhaust gas temperature; and during a second engine airflow condition higher than the first engine airflow: delivering at least some high pressure cooled EGR to the intake, downstream of the compressor, operating the throttle at a second throttle amount more open than the first amount, and operating the compressor bypass valve at a second bypass amount more closed than the first amount.

Description

technical field [0001] The present invention relates to methods and systems for operating an engine with a turbocharger and a high pressure EGR system. Background technique [0002] The efficiency of emission control systems in lean burn internal combustion engines may be improved by increasing the temperature of the exhaust flowing into the emission control system. For example, increasing the exhaust temperature can improve the absorption rate of the lean NOx trap (LNT), which in turn can reduce the vehicle's tailpipe emissions. The temperature of the exhaust can be increased by adding an exhaust gas recirculation (EGR) system, which in turn can recirculate a portion of the engine exhaust into the engine intake passage. For example, lower combustion temperatures and higher exhaust temperatures may occur with combustion systems using higher EGR flow rates. [0003] In a turbocharged diesel engine, throttling fresh intake air while introducing heated, pressurized recirculat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M25/07
CPCF02D41/0007F02D41/1446Y02T10/47Y02T10/144F02B37/16F02M25/0744F02M25/0751F02M25/0728F02M25/0707F02D41/024F02D41/005F02M25/074F02M25/0713F02B29/0406F02M26/05F02M26/10F02M26/25F02M26/35F02M26/38F02M26/44Y02T10/12Y02T10/40F02D41/0047
Inventor 孙惠民
Owner FORD GLOBAL TECH LLC
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