Abstract:
Control of airflow in a uniflow-scavenged, two-stroke cycle, opposed-piston engine during transient operation includes monitoring at least one operating parameter of the engine to recognize a transition to a transient state of engine operation. If a transient state of operation is detected, fuel injection and airflow into to the cylinders of the engine are controlled to optimize combustion and limit emissions. Airflow into cylinders of the engine may be controlled by increasing a scavenging ratio of the engine or by increasing a trapping efficiency of the engine.
Abstract:
A control apparatus for an internal combustion engine is provided which can accurately correct a valve timing deviation of an intake valve caused by a variable operating angle mechanism or variable phase mechanism. A variable operating angle mechanism (28a) for making the operating angle of an intake valve (24) variable is provided. Operating angle command values (operating angles 1 and 3) of two points in front and back at which the intake air amount is decreased by a predetermined amount with respect to the value that is judged to be a maximum value of the intake air amount when the operating angle (command value) is kept changing, are acquired. Then, an intermediate value which is at an equal distance from the operating angle command values of the two points is calculated as the maximum operating angle command value. Then, this maximum operating angle command value is compared with a reference characteristic to execute the calculation of the deviation amount of the valve timing and the correction of the deviation.
Abstract:
Die Erfindung betrifft ein Betriebsverfahren für eine Abgasreinigungsanlage mit einem Abgaskatalysator (4) mit den folgenden Schritten: - Ermitteln einer Katalysator-Kenngröße des Abgaskatalysators (4), wobei die Katalysator-Kenngröße die Reinigungswirkung des Abgaskatalysators (4) wiedergibt, und - Durchführen einer motorischen Maßnahme zur Verbesserung der Reinigungswirkung des Abgaskatalysators (4), wenn die Katalysator-Kenngröße eine unzureichende Reinigungswirkung des Abgaskatalysators (4) anzeigt, und - Ermitteln eines Betriebspunkts des Verbrennungsmotors (1) in einem Motorkennfeld. Die Erfindung sieht vor, dass die motorische Maßnahme zur Verbesserung der Reinigungswirkung des Abgaskatalysators (4) in Abhängigkeit von dem Betriebspunkt des Verbrennungsmotors (1) eingeleitet wird. Weiterhin umfasst die Erfindung ein entsprechendes Antriebssystem.
Abstract:
An internal combustion engine 2 is started by being cranked by an electric motor. An internal combustion engine start control device performs a feedback-control of an intake air amount of the internal combustion engine to a target idle intake air amount, learns a feedback correction amount applied in a feedback control, and performs a learning control using a learnt value in parallel with the feedback control. An engine rotation speed is converged to a target idle rotation speed in an early stage by setting an allowable correction range of a feedback correction amount applied before a start of learning of the intake air amount wider than the allowable correction range of the feedback correction amount applied after the start of the learning of the intake air amount.
Abstract:
The invention relates to a method for determining the EGR rate in an engine (M) of an assembly (100) including: said engine, which is a heat engine (M) of a vehicle having an inlet connected to an intake circuit (2a) and an outlet connected to an gas exhaust circuit (2b) and; a return loop (2c) enabling all or a portion of the exhaust gases flowing in the gas exhaust circuit (2b) to be reinjected into the intake circuit (2a), said loop (2c) including at least one valve (9) configured to shift from a closed position opposing the reinjection of the exhaust gases into the intake circuit (2a) to at least one open position enabling said reinjection of the exhaust gases, said method being one in which the EGR rate in the engine (M) is determined from a quantity representative of the position of the valve (9).