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Diesel aftertreatment systems

a technology of aftertreatment system and diesel, which is applied in the direction of machines/engines, electrical control, separation processes, etc., can solve the problems of negative impact on fuel economy and emission standards

Inactive Publication Date: 2005-03-31
KETCHER DAVID +1
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Benefits of technology

[0009] The present invention provides a number of advantages. In particular, NOx conversion efficiency of the NOx-reducing catalyst is improved by adjusting the injected reductant amounts to compensate for transient increases or decreases in the engine feedgas NOx amounts. Further, monitoring the rate of change of pedal position provides a quick and accurate indication of an impending engine transient and the associated change in engine feedgas NOx. Thus, reductant injection amount can be timely adjusted to compensate for NOx variations. Another advantage of the present invention is improved fuel economy due to optimized reductant usage. For example, reductant injection amount can be reduced in anticipation of engine deceleration to compensate for a reduction in engine feedgas NOx.

Problems solved by technology

Since the amount of reductant injection is typically calculated based on steady state engine operating conditions, these transient NOx variations result in over or under-injection of reductant and negatively impact fuel economy and emission standards.

Method used

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[0015] Internal combustion engine 10, comprising a plurality of cylinders, one cylinder of which is shown in FIG. 1A, is controlled by electronic engine controller 12. Engine 10 includes combustion chamber 30 and cylinder walls 32 with piston 36 positioned therein and connected to crankshaft 40. Combustion chamber 30 is shown communicating with intake manifold 44 and exhaust manifold 48 via respective intake valve 52 and exhaust valve 54. Intake manifold 44 is also shown having fuel injector 80 coupled thereto for delivering liquid fuel in proportion to the pulse width of signal FPW from controller 12. Both fuel quantity, controlled by signal FPW and injection timing are adjustable. Fuel is delivered to fuel injector 80 by a fuel system including a fuel tank, fuel pump, and fuel rail (not shown).

[0016] Controller 12 is shown in FIG. 1A as a conventional microcomputer including: microprocessor unit 102, input / output ports 104, read-only memory 106, random access memory 108, and a c...

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Abstract

A method for improving NOx conversion efficiency of a Nox-reducing catalyst by determining an accurate amount of reductant required is presented. The method includes calculating an initial reductant injection amount based on a steady state amount of NOx in the engine feedgas and adjusting the initial amount to compensate for transient NOx emissions. The compensation is initiated in response to an engine transient, such as impending acceleration or deceleration. This method further results in improved vehicle fuel economy.

Description

BACKGROUND OF INVENTION [0001] 1. Field of Invention [0002] The present invention relates to a system and a method for improving performance of a NOx-reducing catalyst and, more particularly, to controlling an amount of reductant injection to achieve optimum NOx conversion efficiency while minimizing the fuel economy penalty. [0003] 2. Background of the Invention [0004] Current emission control regulations necessitate the use of catalysts in the exhaust systems of automotive vehicles in order to convert carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx) produced during engine operation into harmless exhaust gasses. Vehicles equipped with diesel or lean gasoline engines offer the benefits of increased fuel economy. Such vehicles have to be equipped with lean exhaust aftertreatment devices, such as, for example, an Active Lean NOx Catalysts (ALNC) or Selective Catalytic Reduction (SCR) catalysts, which continuously reduce NOx emissions, even in an oxygen rich environme...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F02D45/00B01D53/86B01D53/94F01N3/08F01N3/20F01N3/28F01N13/02F02B3/06F02D41/02F02D41/10
CPCB01D53/9431B01D53/9495F01N3/208F01N2250/04F01N2250/12F01N2610/02F01N2610/03F01N2900/0404F02B3/06F02D41/0275F02D41/107F02D2200/1012F01N13/009Y02T10/12Y02A50/20
Inventor KETCHER, DAVIDRUONA, WILLIAM
Owner KETCHER DAVID
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