摘要:
An exhaust control system for an internal combustion engine comprises: a trapping capability acquisition part that obtains information regarding a PM trapping capability, based on a detection value of an exhaust sensor provided to detect a predetermined parameter relating to an exhaust gas flowing out of an SCRF; and a NOx reduction capability acquisition part obtains information regarding a NOx reduction capability, based on an amount of NOx in the exhaust gas flowing out of the SCRF. The exhaust control system determines and distinguishes between a trapping abnormal state in which a PM trapping function by the SCRF is failed and a sensor abnormal state in which a detection function of the predetermined parameter by the exhaust sensor is failed, based on the NOx reduction capability obtained by the NOx reduction capability acquisition part, when the trapping capability obtained by the trapping capability acquisition part is in a predetermined low trapping capability state. This allows for accurate abnormality determination with regard to the SCRF in the exhaust control system for the internal combustion engine having the SCRF.
摘要:
The present invention relates to a laminar flow module and a flow meter assembly comprising said laminar flow module, and a selective catalytic reduction system comprising said flow meter. The invention further relates to a method for determining the flow of a fluid using said flow meter. The flow meter and flow module are particularly suitable for use in a selective catalytic reduction (SCR) system.
摘要:
Provided are catalyst articles, methods and systems for treating lean burn engine exhaust. Catalyst articles include selective catalytic reduction catalyst on a particulate filter. The SCR catalyst on the particulate filter provides limited NOx conversion so that unconverted NO2 is available to facilitate passive oxidation of soot trapped on the particulate filter by reaction with NO2. Systems and methods utilize such catalytic articles, and further include, e.g., a downstream selective catalytic reduction catalyst on a flow through substrate.
摘要:
An apparatus for supplying Diesel Exhaust Fluid to an engine exhaust gas treatment system includes a reservoir to collect trapped air if the dosing module is clogged with crystalized urea. The reservoir is placed at the dosing valve inlet on a T-connection. The reservoir provides a closed chamber to receive trapped air in the DEF supply line, allowing DEF to flow to the dosing module. When DEF contacts the crystallized urea causing the clog, the urea dissolves, freeing the injector so that normal action of the dosing module is restored.
摘要:
An SCR system that can suppress thermal damage such as a failure in operation of a dosing valve resulting from crystallization of urea solution and/or corrosion of the dosing valve to perform proper urea solution injection control is provided. The SCR system includes: an SCR (selective catalytic reduction) device 103 provided in an exhaust pipe 102 of an engine E; a dosing valve 104 that injects urea solution on an upstream side of the SCR device 103; a minimum injection quantity setting unit 128 that if a temperature of the dosing valve 104 is equal to or higher than a predetermined temperature, sets a minimum injection quantity according to the temperature of the dosing valve 104; and a urea solution injection control unit 127 that if an injected quantity of urea solution according to a quantity of NOx emitted from the engine E is smaller than the minimum injection quantity, controls the injected quantity of urea solution to be the minimum injection quantity.
摘要:
Ein Verfahren dient zum Ansteuern eines Aktuators 5 in einem Kraftfahrzeug mit einem Verbrennungsmotor als Antriebsaggregat zum Zwecke der Einflussnahme auf ein Betriebsmedium, wobei von einem fahrzeugseitigen Steuergerät 7 ein für den anzusteuernden Aktuator 5 bestimmtes Ansteuertelegramm in eine das Steuergerät 7 mit dem Aktuator 5 verbindende Datenleitung 8 eingespeist wird, welches Ansteuertelegramm einen Soll-Wert eines Ansteuerparameters in Abhängigkeit von dem Betriebszustand des Antriebsaggregates des Kraftfahrzeuges beinhaltet, wobei der Soll-Wert aus einem Kennfeld und/oder einem von dem zu beeinflussenden Parameter unterschiedlichen Betriebsparameter abgeleitet worden ist. In die Datenleitung 8 ist zwischen dem Steuergerät 7 und dem Aktuator 5 ein Korrekturglied 9 eingeschaltet, dass die von dem Steuergerät 7 an den Aktuator 5 gesendeten Ansteuertelegramme durchlaufen. Durch das Korrekturglied 9 werden die einen Soll-Wert eines Ansteuerparameters beinhaltenden Ansteuertelegramme abgefangen und der darin enthaltene Soll-Wert wird mit einem Referenz-Wert verglichen. Bei Feststellen einer Abweichung zwischen dem Soll-Wert und dem Referenz-Wert wird in einem abgefangenen Ansteuertelegramm der Soll-Wert durch den Referenz-Wert ersetzt, bevor das Ansteuertelegramm von dem Korrekturglied 9 an den Aktuator weitergesendet wird. Beschrieben ist des Weiteren eine Einrichtung zur Einflussnahme auf die Ansteuerung eines Aktuators eines Fahrzeuges zum Zwecke der Einflussnahme auf ein Betriebsmedium.
摘要:
It is an object to provide an engine device in which the accessory components of an engine 1 can be prevented from being damaged by an operator with tools, and the accessory components on the upper surface side of the engine 1 can be prevented from being damaged with the radiant heat of a first case 28 or a second case 29. Regarding an engine device that includes the first case 28 that removes particulate matter in the exhaust gas of the engine 1 and the second case 29 that removes nitride oxides in the exhaust gas of the engine 1 and that connects the second case 29 to the first case 28 via a urea mixing pipe 39, an upper surface cover body 87 is adhered on the upper portion of the engine 1 via supporting leg bodies 82, 84, and 86, and the upper portion of the engine 1 is covered with the upper surface cover body 87, while any one or both of the first case 28 and the second case 29 are placed on the upper surface side of the upper surface cover body 87.
摘要:
This apparatus includes a control device executing a urea adding valve operation control. The control device calculates a target instantaneous supply amount (QC), which is a urea water supply amount for cooling a urea adding valve, based on an engine operation state. The control device considers a target cooling supply amount (TQc), which is a target urea water supply amount for the cooling of the urea adding valve, as an amount obtained by a part of a difference between a previous target cooling supply amount (TQc[i]) and the target instantaneous supply amount (QC) being added to the previous target cooling supply amount (TQc[i]). When a cooling water temperature (THW) is equal to or higher than a predetermined temperature and the previous target cooling supply amount (TQc[i]) is "0", the control device uses the target instantaneous supply amount (QC) as the previous target cooling supply amount (TQc[i]) as it is.
摘要:
An exhaust gas purification apparatus includes a SCR converter selectively reducing and purifying NOx in exhaust gas upon being supplied with ammonia generated from urea aqueous solution and an injection nozzle injection-supplying the urea aqueous solution on exhaust gas upstream side of the SCR converter. At least a part of an exhaust pipe located between the injection nozzle and the SCR converter has a double-pipe structure including inner and outer pipes, each having a welded portion, and the welded portion of the outer pipe was welded from an inside of the outer pipe. Thus, the outer pipe has fine welded portion on an inner peripheral surface where a welding temperature is high and the coarse welded portion on an outer peripheral surface where the welding temperature is low, resulting in an ordered atomic arrangement and thus improved corrosion resistance of the inner peripheral surface, which may be exposed to ammonia.
摘要:
The present invention is directed to an exhaust gas sampling device intended to heat or cool a temperature of sampled exhaust gas flowing through a sampling line to a desired temperature in accordance with such as various exhaust gas conditions and usage conditions of the sampling line irrespective of a temperature of the exhaust gas flowing through an exhaust pipe, and includes the sampling line 2 for sampling the exhaust gas to be introduced into an analyzing instrument 3; a plurality of heating parts 41 to 43 provided along the sampling line 2 from an upstream side to a downstream side for heating the exhaust gas flowing through the sampling line 2; and a temperature control part 5 for individually setting set temperatures of the plurality of heating parts 41 to 43 using the temperature of the exhaust gas in the exhaust pipe H and a target temperature T A of the exhaust gas in an outlet side of the heating part 43 located in the most downstream as parameters.