Return control system

A technology of recovery control and urea water, which is applied in exhaust gas treatment, mechanical equipment, engine components, etc., can solve the problems of poor action of quantitative valve 104, no recovery control, and uncertain pressure, and achieves the effect of eliminating poor action.

Active Publication Date: 2013-03-20
ISUZU MOTORS LTD
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Problems solved by technology

[0013] Since the quantitative valve 104 is arranged in the engine exhaust pipe where the high-temperature exhaust gas flows, if the quantitative valve 104 becomes high temperature, the urea water in the quantitative valve 104 also becomes high temperature, as Figure 8 As shown in (a), the urea water in the quantitative valve 104 is crystallized, and the valve body 129 is stuck, or like Figure 8 As shown in (b), the crystallized solid 134 of the urea water is sandwiched between the valve body 129 and the valve seat of the hydraulic cylinder 127, and the injection of the u

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[0030] Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

[0031] First, an SCR system mounted in a vehicle will be described.

[0032] like figure 1 As shown, the SCR system 100 mainly includes an SCR device 103 provided in the exhaust pipe 102 of the engine E, and a metering valve (urea injection device, metering unit) that injects urea water on the upstream side of the SCR device 103 (upstream side of the exhaust gas). ) 104 , a urea tank 105 for storing urea water, a supply unit 106 for supplying the urea water stored in the urea tank 105 to the dosing valve 104 , a DCU (Dosing Control Unit) 126 for controlling the dosing valve 104 or the supply unit 106 and the like.

[0033] In the exhaust pipe 102 of the engine E, a DOC (Diesel Oxidation Catalyst) 107 , a DPF (Diesel Particulate Filter) 108 , and an SCR device 103 are arranged in this order from the upstream side to the downstream side of the exh...

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Abstract

Provided is a return control system for implementing return to normal status by resolving malfunctioning of a dosing valve or clogging of a liquid transfer line through which urea water flows. A return control system for returning to normal status when a dosing valve (104) malfunctionsis provided with: anomaly detection means for detecting anomalies in the dosing valve (104); and return control means for controlling a supply module (106) in order to return urea water inside the dosing valve (104) to a urea tank (105) when a dosing valve (104) anomaly has been detected by the anomaly detection means.

Description

technical field [0001] The present invention relates to a recovery control system for eliminating malfunction of a metering valve or blockage of a liquid delivery pipeline for delivering urea water and returning to a normal state. Background technique [0002] Used to purify NO in the exhaust gas of diesel engines X developed an SCR system using an SCR (Selective Catalytic Reduction, Selective Catalytic Reduction) device. [0003] The SCR system provides the urea water stored in the urea tank to the exhaust gas upstream of the SCR, uses the heat of the exhaust gas to generate ammonia, and uses the ammonia to reduce NO on the SCR catalyst X A system that performs purification (see, for example, Patent Document 1). [0004] use here Figure 6 Describe the process of producing ammonia from urea water. [0005] like Figure 6 As shown, if the temperature of urea water becomes higher than the boiling point, its moisture will start to evaporate, and gas will be generated throug...

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Application Information

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IPC IPC(8): F01N3/18B01D53/94F01N3/08
CPCF01N2610/1453Y02T10/24F01N3/208F01N11/00B01D2251/2067F01N2610/02F01N2550/05F01N2610/1493Y02A50/20Y02T10/12
Inventor 小野寺贵夫岩下拓朗岭泽正信
Owner ISUZU MOTORS LTD
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