Daimler Ag

Daimler Chrysler Ag

Daimler Truck Ag

Thomas Koch

Alexander Massner

Uwe Gaertner

Herbert Zoeller

Jan Gaertner

Frank Zimmermann

Jan Gärtner

Anke Traebert

Jozsef Marton Mercz

Markus Kemmner

Kevin Sisken

Andreas Zygan

Andreas Franke

Achim Dittler

Herbert Zöller

Christian Schmälzle

Christian Krauser

Bernd Lamparter

Dominik Mall

Josef Martin Mercz

Jan GÄRTNER

A method and a device for operating a waste heat utilization device for an internal combustion engine of a motor vehicle is disclosed. The waste heat utilization device contains a waste heat utilization circuit in which a working medium circulates. A conveyor, an evaporator, an expansion machine, and a condenser are disposed in the waste heat utilization circuit. A basic adjustment of the waste heat utilization circuit is provided, which as a function of a heat input into the working medium adjusts the mass flow rate at the conveyor and/or the ratio between high pressure and low pressure at the expansion machine. In addition, a pilot control is provided which recognizes a change of the operating point of the internal combustion engine and, when the operating point is changed, controls the condensation output of the condenser in accordance with a mass distribution of the working medium in the waste heat utilization circuit optimized to the new operating point.

Method for operating a waste heat utilization device

A method for operating an internal combustion engine involves using an injection valve to post-inject fuel into at least one cylinder of the internal combustion engine in order to help regenerate a particulate filter that is arranged in an exhaust system of the internal combustion engine, downstream of an oxidation catalyst. A closing moment of a discharge valve of a cylinder of the internal combustion engine is advanced when the temperature of the oxidation catalyst is in a first temperature range, and the post-injections are performed when the temperature of the oxidation catalyst is in a second temperature range, an upper limit of the first temperature range having a lower value that an upper limit of the second temperature range.

Method for operating an internal combustion engine, and internal combustion engine

An internal combustion engine (), preferably for a motor vehicle, having at least one cylinder () which encloses a combustion chamber () and in which a piston () is situated in such a way that it may perform a stroke movement, and having at least one injector () per cylinder for injecting fuel into the combustion chamber (). The respective injector () has multiple injection openings () through which the fuel exits from the injector () and enters into the combustion chamber (). To be able to react more fuel, first injection openings () and second injection openings () are situated relative to one another in such a way that first injection jets () from the first injection openings () reach the piston () essentially without contacting second injection jets () from the second injection openings ().

Internal combustion engine

A method for operating an internal combustion engine comprising an emission control system that includes at least one catalytic and/or filter-effective emission control component. In conjunction with a cold start and/or a warm-up of the internal combustion engine, the internal combustion engine is operated using a cold start engine operation process having predefined values for predefined operating parameters of the internal combustion engine. An amount of hydrocarbons (HC) stored in one or more of the at least one emission control component is estimated, and the cold start engine operation process is activated when the estimation indicates that the amount of stored HC exceeds a predefined maximum amount of stored HC.

Method for operating an internal combustion engine with an emission control system

In a waste heat utilization arrangement for an internal combustion engine of a motor vehicle including a waste heat utilization circuit in which a working medium is circulated, a pumping device for pressurizing the working medium, an evaporator for vaporizing the working medium by waste heat of the internal combustion engine, an expansion machine for expanding the working medium while extracting mechanical energy therefrom and a condenser for condensing the working medium in a resting state, the waste heat utilization circuit is in communication with a pressure store capable of maintaining a pressure for setting and ensuring a predetermined adjustable minimum pressure of the working medium in the waste heat utilization circuit.

Waste heat utilization device and operating method

A method for operating a motor vehicle internal combustion engine with an exhaust system branch in which a wall-flow exhaust particle filter is arranged. An amount of ash and an amount of soot accumulated in the exhaust particle filter are continuously determined. An ash increase value characterizing an increase in the amount of ash is determined and if pre-set conditions are present, the operation of the internal combustion engine is changed over to a special operating mode for performing an ash detachment and transportation operation, in which operating variables of the internal combustion engine are set such that, on the exhaust entry side in the exhaust particle filter, a pre-settable minimum exhaust flow speed results at which detachment of ash attached to the channel walls of the exhaust particle filter and transportation of detached ash in the direction of the respective inlet channel end is made possible.

Method for operating a motor vehicle internal combustion engine with an exhaust particle filter

In a method for recovering energy from the heat dissipated by an internal combustion engine and to an internal combustion engine wherein the pressure and temperature of a liquid working medium are increased from a lower process pressure and a first temperature to an upper process pressure at which the working fluid is heated to a second temperature whereby it is converted to a gaseous phase; the working medium is then expanded back to the lower process pressure whereby mechanical power is generated and the working medium is converted back to a liquid phase, the upper process pressure being adjusted in such a way that the working medium is expanded into the wet steam area close to the saturated steam limit.

Method for recovering heat losses of an internal combustion engine

In a motor vehicle with an internal combustion engine providing a hot exhaust gas flow which is used as heat source for a Clausius-Rankine cycle process, wherein a pump is provided in the cycle for pumping, pressurizing and circulating an operating fluid, the pumping operation is controlled by a controller depending on the exhaust gas mass flow through an evaporator and possibly also the exhaust gas temperature to vaporize the operating fluid and expanding the vapor under pressure in an expander while generating energy. The vapor is condensed in a condenser to form a condensate which is again returned to the pump.

Method for recuperating energy from an exhaust gas flow and motor vehicle

A method for operating an internal combustion engine comprising an exhaust gas cleaning system that includes a SCR catalyst. In conjunction with a cold start and/or a warm-up of the internal combustion engine, the internal combustion engine is operated using a cold start engine operation method having predefineable values for predefineable operating parameters of the internal combustion engine. An amount of nitrogen oxides stored in the SCR catalyst is estimated, and the cold start engine operation method is activated when the estimation indicates that the nitrogen oxide storage amount exceeds a predefineable nitrogen oxide storage amount limit value.

Method for the operation of an internal combustion engine comprising an emission control system that includes an SCR catalyst

In a method for operating a spark ignition engine, wherein the inlet valves of the spark ignition engine are closed very early or very late, and a combustion air flow which is supplied to the spark ignition engine is compressed by means of a charger, and, under full load operation, the inlet valves are closed either early or late to avoid knocking of the engine, a partial flow of re-circulated exhaust gas is supplied to the combustion air flow supplied to the engine also during full load engine operation.

Method for operating a spark ignition engine

In an internal combustion engine with an air separation unit and a method of realizing such an internal combustion engine, the air separation unit is able to be fed by intake air compressed by a charging unit and cooled by a charged air cooler. The internal combustion engine can at least periodically be fed with a retentate, provided by the air separation unit, having such a composition that, in comparison to normal, it is oxygen enriched. The air separation unit is connected to the outlet of the charged air cooler, and compressed intake air from the charging unit undergoes purification that includes the separation of fluid and/or solid contents before being fed into the air separation unit.

Internal combustion engine with an air separator and methods for realizing such an internal combustion engine

In a multi-cylinder internal combustion engine and a method for operating a multi-cylinder internal combustion engine, cylinders are assigned an exhaust line and, in each case, a gas inlet valve and a gas outlet valve which are used for the charge cycle. At least one of the cylinders of the internal combustion engine has an additional outlet valve through which, in the opened state, a flow connection can be established between the combustion chamber and the exhaust line. At least one of an exhaust gas composition and an exhaust gas temperature is changed compared to the normal operating mode, and regeneration of the exhaust gas cleaning unit can be set in conjunction with a regeneration operating mode for regenerating an exhaust gas cleaning unit which is arranged in the exhaust line by activating the additional outlet valve of at least one cylinder. For the method, the additional outlet valve of at least one cylinder is opened at least temporarily in conjunction with regeneration of the exhaust gas cleaning unit.

Multi-cylinder internal combustion engine and method for operation thereof

A method of operating an internal-combustion engine () which has at least one cylinder () with a combustion chamber () assigned to it, in the cylinder (), a piston () carries out an oscillating movement between a lower dead center and an upper dead center. In the combustion chamber () a fuel-air mixture is ignited. Exhaust gas forming during the combustion of the fuel-air mixture in the combustion chamber () is fed to an exhaust pipe (), and the exhaust gas is purified in an exhaust treatment device () arranged in the exhaust pipe (). For the regeneration of the exhaust treatment device (), the temperature in the exhaust pipe () is increased in that an outlet valve () opening up the combustion chamber () in the direction of the exhaust pipe () is opened in the range of the upper compression dead center of the piston ().

Growing community of inventors

Boeblingen, Germany

Thomas Koch