Abstract:
Brennkraftmaschine, mit einer Regeleinrichtung, wenigstens einem Brennraum, und wenigstens einem durch die Regeleinrichtung über ein Aktuatoransteuersignal regelbaren Injektor zur Einspritzung von flüssigem Kraftstoff in den wenigstens einen Brennraum, wobei in der Regeleinrichtung ein Algorithmus abgelegt ist, welcher als Eingangsgröße das Aktuatoransteuersignal (Δt) und eine Messgröße (y) erhält, und über ein injektorspezifisches Injektormodell die über die Ausbringöffnung des Injektors ausgebrachte Masse an flüssigem Kraftstoff berechnet und die mittels dieses Injektormodells berechnete Masse mit einem gewünschten Sollwert (Formel AA) der Masse an flüssigem Kraftstoff vergleicht, und in Abhängigkeit des Ergebnisses des Vergleichs das Aktuatoransteuersignal (Δt) korrigiert, sowie ein Verfahren zum Betreiben einer solchen Brennkraftmaschine und eines Injektors einer solchen Brennkraftmaschine.
Abstract:
A fuel injection method in an internal combustion engine and an internal combustion engine for performing the fuel injection method. The method includes heating fuel to a temperature between 300°F and 840 °F (150 and 450°C); pressurizing the fuel to a pressure exceeding 40 bar; pre-injecting at least 10% of the fuel charge as a pre-injected fuel during the intake stroke; injecting a fuel charge over at least part of the compression stroke into the cylinder; and injecting an ignition-injection of at least 10% of the fuel in a supercritical condition during the compression stroke at a rotational angle between 90° BTDCF and TDCF into the cylinder. The method and related combustion engine create a good mix of premix combustion and diffusion combustion increasing efficiency and consequently reducing emissions to the environment while also keeping noise and vibrations low.
Abstract:
A technique for controlling air-fuel ratio in an internal combustion engine consuming more than one fuel type comprises: (a) determining a target air-fuel ratio as a function of engine operating conditions; (b) determining an actual air-fuel ratio from the engine operating conditions; (c) determining a first fuel quantity of a first fuel to introduce into a combustion chamber as a function of the engine operating conditions; (d) determining a second fuel quantity of a second fuel such that the actual air-fuel ratio equals the target air-fuel ratio to within a predetermined range of tolerance when the first fuel quantity and the second fuel quantity are introduced into the combustion chamber, the second fuel quantity being determined as a function of the engine operating conditions, the target air-fuel ratio, the actual air-fuel ratio and the first fuel quantity; and (e) introducing the first fuel quantity and the second fuel quantity into the combustion chamber.
Abstract:
A method of fueling an internal combustion engine including operating the internal combustion engine in a dual-fuel mode in which the engine is fueled by a pre-mixed charge of fresh air, recirculated exhaust gases, gaseous fuel as primary fuel and early injected liquid fuel as a secondary fuel, ignited by a late injected pilot fuel to provide low temperature combustion. The method further includes adjusting EGR and/or fresh airflow to the engine to maintain peak in-cylinder temperature in a desired range, preferably between 1500 K and 2000 K. EGR preferably is controlled to obtain a desired in-cylinder O 2 mole fraction, and fresh airflow preferably is controlled to obtain a desired fresh air lambda.
Abstract:
In a gaseous-fuelled stoichiometric compression ignition internal combustion engine, a pilot fuel is injected directly into the combustion chamber to help initiate a multi-point ignition. The engine provides performance improvements approaching those of high pressure direct injection engines but with less complexity because the gaseous fuel is introduced into the intake air subsystem at relatively low pressure and as a result of the stoichiometric combustion, the low oxygen content in the combustion products exiting the combustion chamber allows the use of a three-way catalyst instead of other after treatment arrangements normally associated with conventional compression ignition engines that require the addition of a reductant.