摘要:
The invention relates to a device for supplying a reducing agent into an exhaust system of an internal combustion engine. The device includes a delivery pump for delivering the reducing agent from a storage tank into an exhaust tube of the exhaust system. A metering device is provided between the delivery pump and the exhaust tube, which metering device supplies reducing agent, which is delivered continuously by the delivery pump, in an intermittent fashion into the exhaust tube.
摘要:
The invention relates to a dosing system comprising a dosing means for metering a liquid, especially an aqueous urea solution used for the after treatment of exhaust gases generated by combustion engines. The liquid can be conveyed from a reservoir into an exhaust manifold through the dosing means in a normally operating conveying device. According to the invention, at least one area that is located between a dosing point and the reservoir and is impinged upon by the liquid can be emptied counter to a normal transport direction of the liquid.
摘要:
A method of metering a fluid, pollutant-reducing medium, in particular an aqueous urea solution, into a motor vehicle exhaust system is proposed, in which the fluid medium is delivered to a nozzle module, in particular a nozzle or a valve, and introduced into the exhaust system by the nozzle module. A transport system arranged upstream of the nozzle module is activated with pulse-width modulation. The method and the associated metering system ensure that, in particular, a reducing agent is arranged or metered precisely and in a robust manner relative to degrees of coldness, with the use of few components.
摘要:
The invention proposes a method for metering a reagent, in which the reagent is sprayed into a spray tube (12) via an electrically activated metering valve (24), and is mixed in the spray tube (12) with compressed air, and in which the reagent mixed with compressed air is introduced by means of the spray tube (12) into an exhaust gas duct (10) and is atomized, and a device for carrying out the method. The procedure according to the invention is distinguished in that the duration of the metering valve activation signal (34) is corrected depending on the differential pressure between the hydraulic pressure (p_Rea_hyd) of the reagent in the metering valve (24) and the pneumatic pressure (p_D_pneu) in the spray tube (12). The procedure according to the invention permits a high degree of accuracy in the metering of the reagent.
摘要:
A metering device for introducing an operating medium into an exhaust manifold of an internal combustion engine, the device comprising a cooling system for cooling an injector module of the metering device. The cooling system is provided with a cooling circuit encompassing at least one cooling fluid and at least one cooling device which dissipates heat from the cooling circuit. A first portion of the cooling circuit is disposed at least in part below the cooling device and/or a second portion of the cooling circuit is located at least in part above a point that heats the cooling circuit, especially above the injector module.
摘要:
A method and a device for treatment of the exhaust of an internal combustion engine in which a fluid is used as an auxiliary agent for the treatment; a partial chemical conversion of the auxiliary agent is at least occasionally stimulated in order to produce a substance that reduces the freezing point of the fluid when the temperature of the fluid falls below a critical value.
摘要:
A medium supply system of an exhaust gas cleaning device for treating the exhaust gas of an internal combustion engine comprising a storage tank and a supply line which is connected to the storage tank for supplying the medium to a dosing unit connected to an exhaust pipe and to a recycling line for recycling the medium to the storage tank. The supply line and/or the recycling line are provided with at least one conduit area comprising at least one first and second parallel partial channels for the medium circulation, wherein said partial channels exhibit different insulation properties. An exhaust gas cleaning device comprising the inventive supply system and a method for the operation thereof are also disclosed.
摘要:
The invention relates to a dosing system comprising a dosing means for metering a liquid, especially an aqueous urea solution used for the aftertreatment of exhaust gases generated by combustion engines. The liquid can be conveyed from a reservoir into an exhaust manifold through the dosing means in a normally operating conveying device. According to the invention, at least one area that is located between a dosing point and the reservoir and is impinged upon by the liquid can be emptied counter to a normal transport direction of the liquid.
摘要:
The invention relates to a dosing device (100) for introducing an operating means especially into an exhaust manifold (140) of an internal combustion engine (210). Said dosing device (100) comprises a cooling system for cooling particularly an injector module (110) of the dosing device (100). The cooling system is provided with a cooling circuit (115) encompassing at least one cooling fluid and at least one cooling device (120) which dissipates heat from the cooling circuit (115). A first portion (115a) of the cooling circuit (115) is disposed at least in part below the cooling device (120) and/or a second portion (115b) of the cooling circuit (115) is located at least in part above a point that heats the cooling circuit (115), especially above the injector module (110).
摘要:
The invention relates to an ammonia tank of an exhaust gas treatment system of a vehicle, having a tank wall. The invention provides that the tank wall is surrounded by a reagent reacting with regard to ammonia.