Engine exhaust gas cleaning apparatus

Gas separation: processes – Filtering – With cleaning of filter

Reexamination Certificate

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Details

C095S008000, C095S283000, C095S285000, C055S282200, C055S282300, C055S283000, C055S385300, C055S523000, C055S524000, C055SDIG010, C055SDIG030, C060S274000, C060S285000, C060S295000, C060S299000, C060S303000, C060S311000

Reexamination Certificate

active

10883656

ABSTRACT:
An engine exhaust gas cleaning apparatus is provided to minimize torque shock as during regeneration of an exhaust gas cleaning device. The engine exhaust gas cleaning apparatus comprises a fuel delivery device that delivers fuel to an engine at a lean excess air ratio during normal operation of the engine; a NOx trapping catalytic converter that adsorbs NOx from the exhaust gas during the lean operation; a regeneration control section that adjusts the excess air ratio to a rich target value to regenerate the NOx trapping catalytic converter; a feedback control section that feedback-controls the fuel delivery quantity to hold the excess air ratio at the target value during regeneration; a feedback control restricting section that restricts the feedback control during regeneration until the difference between the target value and the actual excess air ratio is less than a prescribed value.

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patent: 1 072 763 (2001-01-01), None
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patent: 2000-213396 (2000-08-01), None

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