International Engine Intellectual Property Company, LLC

Guoqing Zhang

Xinqun Gui

Michael James Miller

Justin M O'Connor

Xinlei Wang

Shouxian Ren

Michael J Miller

An exhaust system () of a diesel engine () has a diesel particulate filter () for treating exhaust gas. When trapped soot has accumulated to an extent that may affect performance of the filter, an engine control system () forces combustion of trapped soot by increasing exhaust back-pressure using a control device () such as a back-pressure control valve or vanes of a variable geometry turbocharger.

Strategy employing exhaust back-pressure for burning soot trapped by a diesel particulate filter

A sensor probe () includes a probe tip () having a probe centerline (). A pressure tube () fluidly connects the probe tip () with a pressure sensor (). A pipe () having a centerline () is connected to the sensor probe (). The pipe centerline () and the probe centerline () form an acute angle such that the probe tip () points in a downstream direction of the pipe ().

Acute angle pressure sensor probe and method

A method for enabling initiation of regeneration of a NOx adsorber catalyst. While the engine is operating to propel the vehicle, data indicative of NOx adsorption efficiency of the NOx adsorber catalyst, data indicative of temperature of exhaust gas passing through the NOx adsorber catalyst, data indicative of speed of the motor vehicle, and data indicative of engine fueling are processed according to an algorithm () that will enable regeneration to be initiated upon concurrence of the data indicative of NOx adsorption efficiency indicating an efficiency less than a defined efficiency, of the data indicative of temperature of exhaust gas passing through the NOx adsorber catalyst indicating a temperature suitable for initiating regeneration, of the data indicative of speed of the motor vehicle indicating vehicle speed suitable for initiating regeneration, and of the data indicative of engine torque indicating engine torque suitable for initiating regeneration. Upon such concurrence, regeneration of the NOx adsorber catalyst is enabled to be initiated.

Control strategy for reducing fuel consumption penalty due to NOx adsorber regeneration

Engine systems and methods for accomplishing regeneration of a NOx adsorber () using in-cylinder post-injection in a way that creates a lean-rich transition (FIG.) for regenerating the NOx adsorber while attenuating engine torque output fluctuations during the transition without the necessity of using torque sensing to attenuate the fluctuations.

Attenuation of engine harshness during lean-to-rich transitions

Attenuation of engine harshness during lean-to rich transitions

A control system (FIG.) for controlling regeneration of a DPF comprises a favorable-condition-based control section (), a regular control section (), and a regeneration termination control section (). Section () initiates regeneration when the actual soot loading of the DPF becomes sufficiently large to mandate initiation of regeneration. Section () initiates regeneration when the actual soot loading reaches an amount less than the amount at which section () mandates regeneration, provided that selected engine operating conditions disclose conditions favorable for regeneration. Section () terminates regeneration when soot loading is reduced to some minimum amount or when conditions for continuing regeneration become unfavorable. By burning trapped soot during favorable conditions, the mandatory regeneration is postponed. This can lower the average amount of trapped soot in the CDPF, thereby lowering the average back-pressure on the engine.

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Lisle, IL, United States of America

Guoqing Zhang