Abstract:
The invention relates to a method for evaluating the march of pressure in the combustion chamber of an internal combustion engine, wherein the output signal of at least one cylinder pressure sensor and a crankshaft angle sensor is evaluated. Pressure march characteristics for specific valve control times are obtained by analysing the march of pressure in the combustion chamber via the crankshaft angle. Said characteristics enable the following valve control times to be deduced in relation to the crankshaft angle: "outlet opens", "outlet closes", "inlet opens", "inlet closes".
Abstract:
An engine oil filler cap for monitoring an internal combustion engine comprises: a processor; and a sensor module comprising a pressure sensor configured to sense crankcase pressure of the internal combustion engine and to output data representative of the sensed crankcase pressure to the processor. The engine oil filler cap is configured to provide a housing for the processor. The processor is configured to determine a value representative of the firing frequency of the internal combustion engine based on the output data.
Abstract:
The present invention relates to a method for determining reliability regarding misfire determination of cylinders of an internal combustion engine. The method comprises the step of detecting the pressure in the exhaust manifold arrangement of the internal combustion engine for a set of operation parameters comprising a certain range of crank angles for a certain engine load and certain engine speed so as to, for the actual cylinder setup of the engine, create a pressure sample value patterns for combustion and misfire conditions. A template course is created for the thus created pressure sample value patterns, said template course comprising a set of sample points. The pressure for the created template courses is normalized at a desired crank angle. The normalized template courses are stored. Then difference values are determined based upon difference between sample points and corresponding detected and normalized pressure values within in a desired range of crank angles. The thus determined difference values are summarized so as to determine whether a predetermined share of the summarized difference values lies above or below a predetermined threshold value so as to determine reliability regarding misfire determination. The present invention also relates to a control device for determining reliability regarding misfire determination of cylinders of an internal combustion engine. The present invention also relates to a vehicle. The present invention also relates to a computer program and a computer readable medium.
Abstract:
L'invention concerne un procédé d'estimation du taux d'éthanol d'un carburant injecté dans un moteur à combustion interne, sur un nombre n de cycles (n étant un entier supérieur ou égal à 1). Ce procédé comprend les étapes suivantes : déterminer un début de combustion d'un carburant injecté pour chacun des cycles; calculer l'angle moyen de début de combustion ≤ θ début moy ≥ à partir des ≤ θ ≥ de début de combustion relevéspour l'ensemble des n cycles; déterminer une fin de combustion d'un carburant injecté pour chacun des cycles; calculer l'angle moyen de fin de combustion ≤ θ fin moy ≥ à partir des ≤ θ ≥ de fin de combustion relevés pour l'ensemble des ncycles; calculer le délai de combustion entre le temps début de combustion trouvé à partir de ≤ θ début moy ≥ et le temps fin de combustion trouvé à partir de ≤ θ fin moy ≥; déduire le taux d'éthanol à partir du délai de combustion, sur la base d'un modèle déterminé ou d'une liste de correspondance entre des délais de combustion et des taux d'éthanol.
Abstract:
An engine oil dipstick for monitoring an internal combustion engine comprises a processor and a sensor module. The sensor module is configured to sense a characteristic of the internal combustion engine and to output data representative of the sensed characteristic to the processor. The engine oil dipstick is configured to provide a housing for the processor. The processor is configured to determine a value representative of the firing frequency of the internal combustion engine based on the output data.
Abstract:
La présente invention concerne un procédé (45) de détermination de la pression totale dans un cylindre (P cyl ) d'un moteur en fonction de la position angulaire (crk) d'un vilebrequin (14) et à partir d'une quantité de carburant à injecter en éventuellement plusieurs injections, comprenant les étapes suivantes : • détermination de la pression dans le cylindre lorsqu'il n'y a pas de combustion, ladite pression étant dite pression sans combustion (P cyl_m ), • détermination pour chaque injection (inj i ) d'une courbe de sous-variation de pression (ΔP comb_i ) provoquée par la combustion de la quantité de carburant injectée lors de l'injection (inj i ) considérée, courbe dont la forme est estimée en fonction de la quantité de carburant à injecter (MF i ) et de la position angulaire de début d'injection (SOI i ) de l'injection correspondante, • détermination de la pression totale dans le cylindre (P cyl ) par addition de la pression sans combustion (P cyl_m ) et des pressions données par les courbes de sous-variation de pression (ΔP comb_i ) de chaque injection (inj i ).
Abstract:
The invention relates to a method for estimating the level of ethanol in a fuel injected into an internal combustion engine over a number (n) of cycles (n being an integer greater than or equal to 1). The method comprises the following steps: determination of the start of combustion of an injected fuel for each of the cycles; calculation of the average combustion start angle "?ave start" from the combustion start angles (?) recorded for all of the n cycles; determination of the end of combustion of an injected fuel for each of the cycles; calculation of the average combustion end angle "?ave end" from the combustion end angles (?) recorded for all of the n cycles; calculation of the combustion time between the combustion start time on the basis of "?ave start" and the combustion end time on the basis of "?ave end"; and deduction of the level of ethanol from the combustion time on the basis of a pre-determined model or a list of combustion times and associated ethanol levels.
Abstract:
A method of accurately determining the top dead centre position of a piston (11) and a cylinder (12) of a reciprocating type of internal combustion engine (10) when inoperative which has a crankshaft (13) driven in use by the piston (11) via a piston rod (14), the method comprising the steps of connecting to a space (28) in the cylinder (12), a pressure sensitive switch (30, 31) of the kind which is adapted to change its operating state in response to sensing a pressure above or below a threshold pressure to open or close an electrical circuit, the method further comprising connecting the pressure sensitive switch (30, 31) in an electrical circuit which includes an indicating means (45, 46; 45a &cir& _) to indicate when the operating state of the pressure sensitive switch (30, 31) changes, turning the crankshaft (13) manually until the indicating means (45, 46; 45a &cir& _) indicates no change of operating state of the pressure sensitive switch (30, 31) for a corresponding movement of the crankshaft (13).