Abstract: The aim of the invention is to reduce exhaust emission during the staring phase of a direct-injection internal combustion engine. For this purpose, at least one first injection per working cycle takes place when the internal combustion engine is cold, especially during the starting and/or warm-up phase, thereby producing a substantially homogeneous, combustible fuel/air mixture (56) in the combustion chamber (12). In the same working cycle at least one further injection is supposed to take place which produces a substantially rich fuel/air mixture (64) in the zone of the ignition device (34). The lambda value of the fuel/air mixture (64) produced by the second injection in the zone of the ignition device (34) is smaller than the lambda value of the fuel/air mixture (56) present in the remaining combustion chamber.

Abstract: A method for starting an internal combustion engine, in particular of a motor vehicle, is described. The internal combustion engine has a plurality of cylinders and a starter motor. The internal combustion engine is set in motion by the starter motor, and fuel is injected directly into a combustion chamber of the internal combustion engine where it is combusted. Fuel, in the form of at least two partial injections, is injected into the particular cylinder that executes a first compression stroke after a starting onset, starting from which the internal combustion engine is set in motion, the injection taking place during the compression stroke into the combustion chamber.

Abstract: A method for operating an internal combustion engine using an electrically operated air compressor that allows for heating up an exhaust-gas treatment device more rapidly. The electrically operated air compressor is activated during a starting process of the internal combustion engine.

Abstract: During a start, particularly during a cold start, of an internal combustion engine without additional auxiliary drive, a precisely metered fuel mass is introduced into a combustion chamber. In the case of an internal combustion engine having direct fuel injection, a rail pressure prevailing in a high-pressure accumulator is frequently only insufficiently built up during a start, which has an unfavorable effect on the mixture formation. To improve the start performance of the internal combustion engine, the injection pressure available in the high-pressure accumulator is monitored during the start, and fuel from the high-pressure accumulator is first injected into the at least one combustion chamber when the injection pressure has reached or exceeded a specifiable threshold value. This ensures that the rail pressure is high enough, in order to inject a sufficient quantity of fuel into the combustion chamber so that an ignitable air/fuel mixture is formed.

Abstract: A method for heating up a catalytic converter in internal combustion engines having gasoline direct injection is presented and has the steps: shifting the ignition toward retard; checking whether the charge of the cylinders with air exceeds a pregiven threshold; and, dividing the fuel injection into two component quantities which are injected in advance of the ignition when the air charge exceeds the threshold.

Abstract: A method of heating a main catalytic converter positioned downstream from at least one primary catalytic converter by supplying unburned fuel generated by the engine in the exhaust gas upstream from the main catalytic converter while at the same time surplus air is present upstream from the main catalytic converter, where the generation of unburned fuel by the engine takes place at a separate time and/or place from the generation of surplus air in the exhaust gas by the engine.