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公开(公告)号：US09181831B2
公开(公告)日：2015-11-10
申请号：US13699498
申请日：2011-05-16
CPC分类号： F01N3/18 , F01N3/208 , F01N11/002 , F01N13/009 , F01N2550/05 , F01N2610/02 , F01N2610/1493 , F01N2900/08 , F01N2900/1811 , Y02T10/24 , Y02T10/47
摘要： A selective catalytic reduction (SCR) system that can suppress thermal damage in operation of a dosing valve resulting from crystallization of urea solution and corrosion of the dosing valve to perform proper urea solution injection control, and includes an SCR device provided in an exhaust pipe of an engine; a dosing valve that injects urea solution at an upstream side of the SCR device; a minimum injection quantity setting unit that if temperature of the dosing valve is equal to or higher than a predetermined temperature, sets a minimum injection quantity according to the temperature of the dosing valve; and an urea solution injection control unit that if injected quantity of urea solution according to quantity of NOx emitted from the engine is smaller than the minimum injection quantity, controls the injected quantity of urea solution to be the minimum injection quantity.
摘要翻译： 一种选择性催化还原（SCR）系统，其可以抑制由尿素溶液结晶引起的计量阀操作中的热损伤和剂量阀的腐蚀以进行适当的尿素溶液注入控制，并且包括设置在排气管中的SCR装置 发动机 在SCR装置的上游侧注入尿素溶液的计量阀; 最小喷射量设定单元，如果所述计量阀的温度等于或高于预定温度，则根据所述计量阀的温度设定最小喷射量; 以及尿素溶液喷射控制单元，如果根据从发动机排出的NOx的量的尿素溶液的喷射量小于最小喷射量，则将尿素溶液的喷射量控制为最小喷射量。
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公开(公告)号：US20130064719A1
公开(公告)日：2013-03-14
申请号：US13699498
申请日：2011-05-16
IPC分类号： F01N3/18
CPC分类号： F01N3/18 , F01N3/208 , F01N11/002 , F01N13/009 , F01N2550/05 , F01N2610/02 , F01N2610/1493 , F01N2900/08 , F01N2900/1811 , Y02T10/24 , Y02T10/47
摘要： A selective catalytic reduction (SCR) system that can suppress thermal damage in operation of a dosing valve resulting from crystallization of urea solution and corrosion of the dosing valve to perform proper urea solution injection control, and includes an SCR device provided in an exhaust pipe of an engine; a dosing valve that injects urea solution at an upstream side of the SCR device; a minimum injection quantity setting unit that if temperature of the dosing valve is equal to or higher than a predetermined temperature, sets a minimum injection quantity according to the temperature of the dosing valve; and an urea solution injection control unit that if injected quantity of urea solution according to quantity of NOx emitted from the engine is smaller than the minimum injection quantity, controls the injected quantity of urea solution to be the minimum injection quantity.
摘要翻译： 一种选择性催化还原（SCR）系统，其可以抑制由尿素溶液结晶引起的计量阀操作中的热损伤和剂量阀的腐蚀以进行适当的尿素溶液注入控制，并且包括设置在排气管中的SCR装置 发动机 在SCR装置的上游侧注入尿素溶液的计量阀; 最小喷射量设定单元，如果所述计量阀的温度等于或高于预定温度，则根据所述计量阀的温度设定最小喷射量; 以及尿素溶液喷射控制单元，如果根据从发动机排出的NOx的量的尿素溶液的喷射量小于最小喷射量，则将尿素溶液的喷射量控制为最小喷射量。
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