Abstract: A mixing device for mixing the exhaust gas of an internal combustion engine flowing in an exhaust pipe with a reducing agent as well as an exhaust gas purification system having such a mixing device are described. A mixing body that is positionable in the exhaust pipe and having a gas impact surface and a spray impact surface is provided so that exhaust gas flowing from the internal combustion engine is able to strike the gas impact surface and reducing agent, which is suppliable transversely to the exhaust gas flow, is able strike the spray impact surface, the spray impact surface and the gas impact surface forming disjointed sub-areas of the surface of the mixing body. The mixing device distributes the reducing agent uniformly over the cross section of the exhaust pipe and mixes it uniformly with the exhaust gas.

Abstract: A device and a method for controlling an exhaust-gas aftertreatment system, in particular for an internal combustion engine, are described. The exhaust-gas aftertreatment system includes at least one catalytic converter. A reducing agent is supplied to the exhaust-gas aftertreatment system. An exhaust gas mass flow is preselectable on the basis of the power consumption by a sensor and/or on the basis of a pressure variable.

Abstract: A method of reducing nitrogen oxides of an exhaust gas, of an exhaust gas of a motor vehicle in particular, is described, an aqueous urea solution being fed to a reactor (42) and converted by thermal, catalytic or enzymatic treatment into a decomposition product containing ammonia and carbon dioxide and at least the ammonia is added to the exhaust gas. The aqueous urea solution contains a substance for transferring heat and for lowering the freezing point (FIG. 7).

Abstract: A device and a method for controlling an exhaust-gas aftertreatment system, in particular for an internal combustion engine, is described. The exhaust-gas aftertreatment system includes at least one catalytic converter. A preselectable quantity of reducing agent is supplied to the exhaust-gas aftertreatment system as a function of the state of the internal combustion engine and/or the exhaust-gas aftertreatment system. The quantity of reducing agent supplied is adjusted.

Abstract: Apparatus for storing and metering of reducing agents that may be used within the framework of a catalytic exhaust gas aftertreatment, having a device (10) for storing the reducing agent to be metered and a metering device (20) for applying the reducing agent to the exhaust gas to be treated, the device (10) for storing the reducing agent having an outer container (11) and a cartridge (12), containing the reducing agent, that is able to be exchangeably positioned in it.

Abstract: A device for generating a mixture of reducing agent and air, having a mixing space (16) into which reducing agent via a reducing agent delivery conduit (64) and air via an air delivery conduit (61) can be introduced into the mixing space (16), having means for pressurizing the air, in such a way that the air flows essentially at the speed of sound through the air delivery conduit (61).

Abstract: A fuel injection valve for internal combustion engines, having a valve member that is axially displaceable in a valve body and that with a sealing face cooperates, to control an injection opening, with a valve seat face on the valve body. An end of the valve member remote from the combustion chamber is urged in the closing direction by a valve spring disposed in a spring chamber. The valve member has a pressure shoulder acting in the opening direction, which protrudes into a pressure chamber that is filled with high fuel pressure. Via a throttle gap, the spring chamber communicates with the pressure chamber and is sealed off from a fuel return system, so that during the opening stroke motion of the valve member the spring chamber acts as a hydraulic damper.

Abstract: A control device is proposed for regulating the exhaust gas recycling rate in an internal combustion engine with self-ignition in which combustion pressure signals are adjusted directly or indirectly to nominal values dependent on operating characteristics of the engine. In one particular embodiment the combustion pressure signal is differentiated and the frequency of certain occurring amplitude values is adjusted to a nominal value. Owing to the integration of specific combustion processes into the regulation, the device is capable of operating with relatively high precision. It is particularly well suited to compensate for drift phenomena.

Abstract: A method and an apparatus are proposed for determining and controlling an exhaust gas recirculation rate in internal combustion engines (Diesel engines), wherein an adjusting member in the exhaust gas recirculation line is adjusted by a regulator in order to attain precise regulation of the exhaust gas quantity recirculated to the aspirated air zone. The regulator is supplied with the exhaust gas temperature (T4) measured at a given time as the load signal for the engine. The comparison value of the regulator is then either an actual value of the exhaust gas recirculation rate, ascertained by means of effective temperature measurements in the intake zone of the engine, or a set-point differential temperature which is produced by means of measuring the aspirated air quantity at a given time and the rpm.

Abstract: An apparatus for regulating the exhaust gas recycling rate in an internal combustion engine having self-ignition is proposed, in which a set-point or nominal ignition delay value is ascertained, and the actual ignition delay value is regulated to this nominal value. The nominal ignition delay value is efficaciously derived from a multi-dimensional memory, the coordinate values of which are dependent on at least load and rpm. The ignition delay time is ascertained from a comparison of the signal for the injection onset of an injection nozzle, for instance, and the signal of a pressure sensor communicating with the combustion chamber.

Abstract: A fuel supply system for an internal combustion engine includes an airflow metering device in the induction manifold which directly actuates a fuel metering valve formed by cooperating parts of the airflow meter bushing and the shaft around which it pivots. A differential pressure valve holds the pressure drop across the fuel metering aperture constant. Bimetallic springs are provided to exert temperature dependent forces on the diaphragm in the differential pressure valve to increase the differential pressure when the engine is cold.

Abstract: A fuel metering system for an internal combustion engine has an arbitrarily settable throttle plate which controls the air flow through the induction tube and an air flow responsive valve element, shaped somewhat like a cylindrical sector, which is pivoted inside the induction tube upstream of the throttle plate. The pivoting valve element has a shaft which is surrounded by a bushing. An opening in the bushing is uncovered to varying extent by a control edge on the pivotal shaft so as to meter out fuel in proportion to the angular excursion of the pivoting valve element. The fuel is delivered to the induction tube directly downstream of the pivoting valve element.

Abstract: A fuel injection system for use with internal combustion engines in which is provided an air aspiration line within which is included a fuel valve for the apportionment of a fuel quantity proportional to the air quantity. The fuel valve extends transversely of the air aspiration line and is arranged to include a plurality of communicating passages about which is positioned a perforated carrier body. A sleeve that includes valve members is also arranged to encircle the carrier body and together therewith adapted to control fuel flow and air flow to said engine.