SCR SYSTEM

PROBLEM TO BE SOLVED: To provide a SCR system capable of using output signals of NOx concentration from NOx sensors even when the NOx concentration suddenly changes.SOLUTION: The SCR system includes a low-pass filter processing part 1 for passing the output signals of the NOx concentration output by...

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Bibliographic Details
Main Authors SAWADA AKIHIRO, MINESAWA MASANOBU, TSUNODA NAOTO
Format Patent
LanguageEnglish
Published 05.01.2012
Subjects
BLASTING
COMBUSTION ENGINES
CONTROLLING COMBUSTION ENGINES
ENGINE PLANTS IN GENERAL
GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNALCOMBUSTION ENGINES
GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES ORENGINES IN GENERAL
HEATING
HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
LIGHTING
MACHINES OR ENGINES IN GENERAL
MECHANICAL ENGINEERING
STEAM ENGINES
WEAPONS
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Summary:PROBLEM TO BE SOLVED: To provide a SCR system capable of using output signals of NOx concentration from NOx sensors even when the NOx concentration suddenly changes.SOLUTION: The SCR system includes a low-pass filter processing part 1 for passing the output signals of the NOx concentration output by the NOx sensors 110, 111 with no processing before receiving an invalid signal, and for applying filter processing using preset step response characteristics G1 to the output signals of the NOx concentration output by the NOx sensors 110, 111 when receiving the invalid signal, and a urea water injection control part 2 for controlling the injection of urea water depending on the NOx concentration output from the low-pass filter processing part 1.
Bibliography:Application Number: JP20100137063