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    An Improved Selective Catalytic Reduction System
    1.
    发明申请
    An Improved Selective Catalytic Reduction System 审中-公开

    公开(公告)号：US20190316503A1

    公开(公告)日：2019-10-17

    申请号：US16463612

    申请日：2017-12-11

    Applicant: Perkins Engines Company Limited

    Inventor： Leo Shead ,  Alexis Eden ,  Ronald Silver

    IPC: F01N3/035 ,  F01N3/10 ,  F01N3/20 ,  F01N11/00 ,  F01N13/00

    Abstract: A method of treating exhaust gas in an exhaust passage using a selective catalytic reduction system is provided. The system comprises a hydrolysis catalyst in the passage upstream of a SCR catalyst, and a diesel exhaust fluid (DEF) dosing unit for injecting DEF onto the hydrolysis catalyst at a variable DEF dosing rate. The method comprises the steps of predicting an initial DEF dosing rate for converting all nitrogen oxide (NOx) contained in the exhaust gas, and estimating an amount of ammonia stored on the SCR catalyst. The method further comprises the steps of measuring a NOx conversion rate for the system, and adjusting the initial DEF dosing rate based upon the ammonia storage estimate and the measured NOx conversion rate to produce a first adjusted DEF dosing rate. An amount of ammonia-equivalent stored on the hydrolysis catalyst is then estimated, and the first adjusted DEF dosing rate is adjusted based upon the ammonia-equivalent storage estimate to produce a second adjusted DEF dosing rate. DEF is then injected at the second adjusted DEF dosing rate.

    Selective catalytic reduction system
    3.
    发明授权
    Selective catalytic reduction system 有权

    公开(公告)号：US11105236B2

    公开(公告)日：2021-08-31

    申请号：US16463612

    申请日：2017-12-11

    Applicant: Perkins Engines Company Limited

    Inventor： Leo Shead ,  Alexis Eden ,  Ronald Silver

    IPC: F01N3/035 ,  F01N13/00 ,  F01N3/10 ,  F01N3/20 ,  F01N11/00

    Abstract: A method of treating exhaust gas in an exhaust passage using a selective catalytic reduction system is provided. The system comprises a hydrolysis catalyst in the passage upstream of a SCR catalyst, and a diesel exhaust fluid (DEF) dosing unit for injecting DEF onto the hydrolysis catalyst at a variable DEF dosing rate. The method comprises the steps of predicting an initial DEF dosing rate for converting all nitrogen oxide (NOx) contained in the exhaust gas, and estimating an amount of ammonia stored on the SCR catalyst. The method further comprises the steps of measuring a NOx conversion rate for the system, and adjusting the initial DEF dosing rate based upon the ammonia storage estimate and the measured NOx conversion rate to produce a first adjusted DEF dosing rate. An amount of ammonia-equivalent stored on the hydrolysis catalyst is then estimated, and the first adjusted DEF dosing rate is adjusted based upon the ammonia-equivalent storage estimate to produce a second adjusted DEF dosing rate. DEF is then injected at the second adjusted DEF dosing rate.

    HEATING SYSTEM FOR AN EXHAUST GAS TREATMENT SYSTEM
    5.
    发明申请
    HEATING SYSTEM FOR AN EXHAUST GAS TREATMENT SYSTEM 审中-公开
    用于排气处理系统的加热系统

    公开(公告)号：US20170009633A1

    公开(公告)日：2017-01-12

    申请号：US15115822

    申请日：2015-01-20

    Applicant: PERKINS ENGINES COMPANY LIMITED

    Inventor： Ronald Silver ,  Paul Moore ,  Igor Strashny ,  David Heaton

    IPC: F01N5/02 ,  F01N3/20

    CPC classification number: F01N5/02 ,  F01N3/2066 ,  F01N3/208 ,  F01N2610/102 ,  Y02A50/2325 ,  Y02T10/24

    Abstract: The present disclosure relates to a heating system for an exhaust gas treatment system. The heating system comprises a first heating element comprising a receiving surface for receiving a reductant fluid and a second heating element, which may surround the first heating element. The second heating element may be a thermochemincal or thermophysical device. In a first mode of operation the second heating element is arranged to receive thermal energy from engine exhaust gas. In second mode of operation the second heating element transfers thermal energy to heat the first heating element.

    Abstract translation: 本公开涉及一种用于废气处理系统的加热系统。 加热系统包括第一加热元件，第一加热元件包括用于接收还原剂流体的接收表面和可围绕第一加热元件的第二加热元件。 第二加热元件可以是热化学或热物理装置。 在第一操作模式中，第二加热元件布置成从发动机废气接收热能。 在第二操作模式中，第二加热元件传递热能以加热第一加热元件。

    Apparatus and method for detecting urea deposit formation
    6.
    发明授权
    Apparatus and method for detecting urea deposit formation 有权

    公开(公告)号：US10550744B2

    公开(公告)日：2020-02-04

    申请号：US15127988

    申请日：2015-04-01

    Applicant: Caterpillar Inc. ,  Perkins Engines Company Limited

    Inventor： Ronald Silver ,  Benjamin Reid ,  Thomas Steffen

    IPC: F01N3/20 ,  B01D53/94 ,  F01N11/00 ,  F01N13/00 ,  F02D41/02

    Abstract: An apparatus for detecting urea deposits in an exhaust pipe of an internal combustion engine is provided, where the urea is introduced into the exhaust pipe in an aqueous urea solution via a nozzle. The apparatus comprises at least one radiation receiver which, in use, is located within the exhaust pipe downstream of the nozzle. The apparatus further comprises an electronic control unit in communication with the receiver, wherein the receiver communicates radiation data to the control unit which allows the control unit to establish whether deposits have formed within the exhaust pipe. A control valve is also provided which controls flow of the solution to the nozzle in response to signals from the control unit. A method of detecting urea deposits in an exhaust pipe of an internal combustion engine is also provided, as in an automotive vehicle incorporating the aforementioned apparatus.

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