Abstract:
A method and apparatus for injecting fuel into a diesel engine combustion chamber is provided wherein a pre-pilot injection (225) is injected sufficiently prior to critical mass conditions being achievable to permit vaporization and formation of a substantially homogenous mixture before a critical mass exist. Preferably, a pilot injection (215) is injected after the pre-pilot injection (225) but at or before a point wherein a critical mass based on the pre-pilot (225) quantity is attained. This will result in a reduced heat release rate which in turn will result in a slower, smoother and more controlled build-up of pressure in the combustion chamber and thereby advantageously reduce combustion noise.
Abstract:
A method of controlling fuel delivery in a fuel injection system capable of performing a split injection includes comparing at least one engine operating temperature to a temperature threshold, and disabling split injection when at least one engine operating temperature exceeds the temperature threshold. Disabling split injection in this manner enhances cold temperature engine operation while providing a single injection at higher operating temperatures, as desired. Further, an engine (12) and a computer readable storage medium (28) having information stored thereon representing instructions executable by an engine controller (22) for comparing at least one engine operating temperature to a temperature threshold are also provided. The computer readable storage medium instructions disable split injection when at least one engine operating temperature exceeds the temperature threshold.
Abstract:
A method of controlling an engine system includes controlling a fuel injector to perform a zero-fueling injector operation during operation of the engine, the zero-fueling injector operation including a non-zero injector on-time resulting in zero fueling by the injector, determining an injection system pressure change associated with the zero-fueling injector operation, modifying at least one fuel injection control parameter in response to the injection system pressure change, and using the modified fuel injection control parameter to control injection of fuel by the fuel injector during operation of the engine.
Abstract:
A pressure-based piston top-dead-center ("TDC") position measurement system is disclosed, comprising: a fuel injector configured to inject fuel into a combustion chamber bounded in part by the piston; and a controller configured to control the fuel injector to cause a fuel injection when the piston is at each of a plurality of different positions relative to TDC while ensuring fuel is provided to the fuel injector at a substantially constant pressure. The controller is further configured to estimate a pressure in the combustion chamber in response to each fuel injection, fit a curve to the estimated pressures, and determine a TDC position of the piston as correlating with a maximum pressure on the curve.
Abstract:
Beim Einspritzen von Kraftstoff in einen Brennraum (2) eines Zylinders (13) eines Motors (30) eines Fahrzeugs (10) wird der Kraftstoff in Form mehrerer Strahlen (3) mittels eines Injektors (1) eingespritzt. Dabei ist eine erste Ebene definiert, in welcher sowohl die Mittelachse (11) des Injektors (1) als auch die Mittelachse (12) des Zylinders (13) liegen. Darüber hinaus ist eine zweite Ebene definiert, in welcher sowohl die Mittelachse (11) des Injektors (1) als auch die Flächennormale der ersten Ebene liegen. Die Strahlen (3) werden derart erzeugt, dass für jedes Strahlenpaar, welches aus zweien der Strahlen (3) gebildet wird, ein Winkel zwischen den Projektionen der beiden Mittelachsen der zwei Strahlen des Strahlenpaars in die zweite Ebene kleiner als 50° ist.
Abstract:
La présente invention concerne un procédé de contrôle de l'injection d'un carburant dans un moteur à combustion interne à injection directe, notamment de type Diesel, comportant un cylindre (10) avec une chambre (14) pour la combustion d'un mélange carburé et comprenant des moyens d'injection de carburant (20) dans ladite chambre en au moins un jet (24) comprenant une portion primaire de jet (26) et au moins une portion secondaire de jet (28) succédant à la portion primaire. Selon l'invention, le procédé consiste à injecter dans la chambre de combustion la portion primaire (26) de jet selon au moins une direction (A, B; E) et à injecter la portion secondaire (28) de jet dans au moins une direction (C, D, F, G, H, I, J, L, M) formant un angle (α, Θ) non nul avec la direction de ladite portion primaire de jet.
Abstract:
An internal combustion barrel engine (10, 10' ,10") having rotating cylinders (46) and pistons (54) which together form combustion spaces. The combustion spaces are maintained at a substantially constant volume while a compressed air- fuel mixture is combusted therein.