Process for optimizing the mixture formation of a high-speed direct-injection diesel engine and a diesel engine operated according to this process

摘要

The invention relates to a method for optimizing the mixture formation of a high-speed, direct-injection diesel engine and a diesel engine operated according to this method with a plurality of inlet channels and at least one outlet channel per cylinder and with valves for opening and closing the channels, at least one inlet channel as a swirl channel and at least one further inlet channel are designed as a filling channel and the cross-section of the filling channel (s) can be changed by an engine control unit by means of throttle elements, so that when they are throttled, a larger proportion of the charge reaches the cylinder through the swirl channel (s) and thus the charge swirl c¶u¶ / c¶a¶ increased. DOLLAR A According to the method, a higher charge swirl c¶u¶ / c¶a¶ is set at a relatively low fuel temperature T in the area of the injection nozzle and vice versa. DOLLAR A For this purpose, the diesel engine is designed in such a way that the filling channels are increasingly throttled with decreasing fuel temperature T, so that the charge swirl c¶u¶ / c¶a¶ in the cylinder goes back to a predetermined minimum value. DOLLAR A This enables the engine to be operated with uniform combustion, low levels of pollutants in the exhaust gas, increased torque and better efficiency despite the relatively cold fuel in the injection jet.