Method for reducing discharge of diesel engine and diesel engine

A diesel engine and engine technology, applied in engine components, engine control, combustion engines, etc., can solve the problems of restricting the flow area of ​​EGR gas, blocking, and reducing heat transfer efficiency.

Active Publication Date: 2013-08-07
MACK TRUCKS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Liquid hydrocarbons and acids applied to the carbonaceous soot layer can render the EGR cooler ineffective

Method used

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  • Method for reducing discharge of diesel engine and diesel engine

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Embodiment Construction

[0015] exist figure 1 A diesel engine 21 according to an aspect of the invention can be seen in it, the diesel engine 21 comprising at least one piston 23 movable within a cylinder 25 between a top dead center (TDC) position and a bottom dead center (BDC) position move. A fuel injector 27 is arranged to inject fuel into the cylinder, typically around TDC, and the combined effects of temperature and pressure cause the fuel to combust and cause the piston to move toward the BDC position. Piston 23 is typically coupled to a crankshaft (not shown) that turns as the piston reciprocates.

[0016] A variable geometry turbine (VGT) 29 is disposed downstream of the exhaust port 31 of the engine 21 , through which exhaust gas from the cylinders 25 is adapted to flow. The VGT 29 is typically part of a turbocharger arrangement comprising a compressor 33 arranged upstream of an air intake 35 for boosting engine intake pressure. The VGT 29 has conventional VGT vanes (not shown) for varyi...

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Abstract

The invention provides a method for reducing discharge of a diesel engine and the diesel engine. The engine comprises at least a piston capable of moving between a TDC (Top Dead Center) position and a BDC (Bottom Dead Center) position within a cylinder, a fuel injector used for injecting fuel in the cylinder, a variable geometric turbine through which exhausted gas from the engine is suitable for flowing, and an exhausted gas recirculation system which comprises an exhausted gas recirculation valve arranged between an air inlet and an air outlet of the engine. The method comprises the following steps: enabling the engine to run at a low load; and when the engine runs at the low load, carrying out closed-loop control on the opening size of the inlet of the variable geometric turbine, the opening degree of the exhausted gas recirculation valve, the correct time of the fuel injector and a pressure at a fuel injection nozzle by utilizing an NOx sensor at the exhaust port of the engine and a controller, thereby controlling discharge of NOx, hydrocarbon and particles.

Description

[0001] divisional application [0002] This application is a divisional application of the Chinese patent application with the application number 200880124353.5. The filing date of the above application is January 8, 2008, and the title of the invention is "Method for Reducing Diesel Engine Emissions and Diesel Engine". technical field [0003] The present invention generally relates to methods and diesel engines for reducing emissions from diesel engines. Background technique [0004] Strict emissions regulations enforced by regulatory agencies in the United States and Europe have gradually reduced the allowable emissions of diesel engine exhaust. Recent proposals from regulators have forced engine manufacturers to maintain a maximum NOx emission of 30 g / hr during extended idling conditions. [0005] Currently known emission control strategies cannot achieve this without damaging engine components. For example, current methods of implementing exhaust gas recirculation (EG...

Claims

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Application Information

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IPC IPC(8): F02B37/00F02B41/10F02M25/07F02B37/24F02D41/00F02D41/30
CPCY02T10/163Y02T10/121Y02T10/144Y02T10/12
Inventor 约翰·C·吉布尔蒂莫西·祖德尔
Owner MACK TRUCKS
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