Abstract: In a method of operating an internal combustion engine of a motor vehicle during an engine warm-up phase, the engine having a cylinder including a piston defining in the cylinder a combustion chamber, wherein fuel is injected into the combustion chamber in a pilot injection, a main injection and, selectively, a post-injection, and during the heat-up phase of the engine, the center position of the combustion is retarded relative to a center position of the combustion in the normal engine operating mode in order to more rapidly heat the engine and the coolant in the engine cooling circuit for rapid heating of the passenger compartment of the motor vehicle.

Abstract: In a method of operating an internal combustion engine with a cylinder including a piston defining in the cylinder a combustion chamber, in particular a diesel internal combustion engine, with multiple direct fuel injections, the engine having a coolant circuit and an exhaust gas recirculation device, the fuel is injected into the combustion chamber in a pilot injection, a main injection and selectively a post-injection, while the internal combustion engine is operated in a heat-up phase as a function of the engine coolant temperature. During the heat-up phase, the center position of the combustion is retarded relative to a center position of the combustion in the normal engine operating mode, and in order to increase the heat transfer to the coolant circuit, the pilot injection is carried out in the form of at least two partial quantities, with the injection of the entire fuel quantity taking place in such a way that the center position of the combustion during the heat-up phase is after top dead center.

Abstract: In a method for operating an internal combustion engine, in particular an auto-ignition internal combustion engine, having at least one combustion chamber in which an air/fuel mixture is formed, and recirculated exhaust gas is admixed to the combustion air, a base setting of the exhaust gas recirculation rate is established as a function of a first characteristic operating variable, the exhaust gas recirculation rate is adjusted depending on at least one of the first and a second characteristic operating variable, and, in order to optimize combustion, the exhaust gas recirculation rate is adjusted a second time on the basis of a combustion noise measurement.

Abstract: In a method of heating the interior of a vehicle having an internal combustion engine with fuel injection and a coolant circuit for transferring waste heat from the internal combustion engine via a heat exchanger to the vehicle interior by increasing the amount of heat transferred to the coolant during low load engine operation by intentional reduction of the engine operating efficiency, the engine is operated with high exhaust gas recirculation rates while transferring heat from the exhaust gas to the coolant for heating the vehicle interior and heating with the relatively large amount of recirculated gas the intake air so that, during the following compression of the intake air and recirculated gas in the engine combustion chamber, the air is heated early to an ignition temperature permitting early combustion of injected fuel so that the fuel injection phase can be extended not only toward late injection but also toward early injection providing for a relative long combustion period whereby engine efficienc

Abstract: In a method for operating an internal combustion engine, and a motor vehicle to be heated by the engine coolant, wherein the internal combustion engine has a cooling circuit, a heating mode can be established in which operating parameters of the internal combustion engine, while satisfying required output set values, are set for the maximum possible introduction of heat into the coolant and the exhaust gas in order to reach or hold a desired coolant temperature.

Abstract: In a method for operating an internal combustion engine, and a motor vehicle to be heated by the engine coolant, wherein the internal combustion engine has a cooling circuit, a heating mode can be established in which operating parameters of the internal combustion engine, while satisfying required output set values, are set for the maximum possible introduction of heat into the coolant and the exhaust gas in order to reach or hold a desired coolant temperature.