Abstract:
The invention relates to a fuel-injection valve (1), in particular to a fuel-injection valve (1) for directly injecting fuel into a combustion chamber of an internal combustion engine. Said valve comprises an actuator (10) for actuating a valve needle (3), the injection end of said valve needle (3) having a valve closing body (4). The valve closing body forms a sealed seat with a valve seat surface (6) that is configured on a valve seat body (5). Fuel channels (35) are arranged in several rows (34, 34a) around the periphery of a valve needle guide (31) that is connected to, or produced as one piece with the valve seat body (5), at least one row (34a) of fuel channels (35) being arranged above a guide line (33) of the valve closing body (4) in the idle state of the fuel-injection valve (1).
Abstract:
An internal combustion engine (10) is operated by a method, according to which petrol is directly injected into a combustion chamber (12). The injection takes place at least temporarily in such a way that in association with a corresponding supply of air into the combustion chamber (12), the petrol-air mixture lies in layers in said combustion chamber (12). The aim of the invention is to reduce the petrol consumption of the internal combustion engine (10) by means of an increased compression ratio, without the risk of knocking. To achieve this, the petrol is injected exclusively during the compression phase of the internal combustion engine (12), even at wide-open throttle, by a multihole fuel injection device (22).
Abstract:
The invention relates to a fuel injection system for internal combustion engines, comprising, amongst other things, at least one fuel injection valve (4), which injects fuel into a combustion chamber (7), with a spark plug (3), extending into the combustion chamber (7). The fuel injection valve (4) comprises a valve body (10) which has several circumferential injection nozzles (11, 11d). The injection nozzles (11, 11d) are arranged such that a conical injection stream (5) is produced in the combustion chamber (7). At least those injection nozzles (11d) which are directly adjacent to the spark plug (3) comprise an oblong cross-section.
Abstract:
The invention relates to a method for operating an internal combustion engine (1), whereby the fuel that is to be injected into a combustion chamber (4) or an intake pipe (7) is located in a pressure accumulator (13) with variable injection pressure (p). In order to enable given operating states, e.g. after a cold start or during a warm-up period, wherein the internal combustion engine (1) can operate at an optimal range in terms of the lowest possible fuel consumption and the lowest possible waste gas emission, the injection pressure (p) in the pressure accumulator (13) is regulated depending on the temperature (T) of the internal combustion engine (1). Preferably, the injection pressure (p) is increased when the temperature (T) of the internal combustion engine (1) falls below the operating temperature of the injection pressure (p). Furthermore, the injection point can be regulated at later intervals when the temperatures (T) are low.
Abstract:
An internal combustion engine (10) operable in a premixed charge compression ignition mode and a method for operating the engine (10), the engine (10) including an engine body (12) with a piston assembly (14), a combustion chamber (16) formed in the engine body (12) by the piston assembly (14), an intake system (18) for delivering intake air to the combustion chamber (16) during an intake stroke, a mixing device that mixes a first fuel (23) with the intake air to provide a premixed charge of air and the first fuel (23), a direct fuel injector (26) adapted to directly inject a second fuel (27) into the combustion chamber (16), and a control system (20) adapted to control the direct fuel injector (26) in a manner to provide at least one early control injection, and preferably, a plurality of early control injections of the second fuel (27) into the combustion chamber (16) before start of combustion of the premixed charge.
Abstract:
A multi-mode internal combustion engine (10) and method of operating the engine (10) is provided which is capable of operating in a variety of modes based on engine operating conditions to enhance fuel efficiency and reduce emissions. The multi-mode engine include a fuel delivery system (60) and control system (54) for permitting the engine (10) to operate in a diesel mode, a homogeneous charge dual fuel transition mode, a spark ignition or liquid spark ignition mode and/or a premixed charge compression ignition mode. The control system (54) and method permits the engine operation to transfer between the various modes in an effective and efficient manner by controlling one or more fuel delivery devices or other engine components so as to move along a continuous transfer path while maintaining engine torque at a substantially constant level.
Abstract:
A cylinder injection type spark ignition engine enabling a stratified combustion with high robustness without relying upon tumbling generated in a combustion chamber, comprising a fuel injection nozzle (9) directly injecting fuel into the combustion chamber (4), wherein the fuel injection nozzle injects fuel into the combustion chamber during compression stroke and the mixture is ignited by a spark plug (10) to provide the stratified combustion, the fuel injection nozzle (9) generates, separately from air flow supplied through an intake port to the combustion chamber, lead spray (13) supplied toward the spark plug prior to the subsequent fuel spray for ignition (14), and the mixture evaporated from the fuel spray for ignition at the time of ignition is fed to the spark plug by the lead of the lead spray (13).
Abstract:
The invention relates to a fuel injection system (1) for internal combustion engines, comprising a fuel injection valve (10), provided with an orifice plate, through which the fuel is injected into the combustion chamber (2). Said combustion chamber (2) is defined by a cylinder wall (3). A piston (6) is guided inside said cylinder wall (3), and a spark plug (7) projects into the combustion chamber (2). The diameters of the injection holes disposed on the orifice plate are distributed in such a manner that at a predetermined injection time the fuel injected is distributed as homogeneously as possible in an injection volume (23) of the combustion chamber (2) that is defined by the piston (6) and the cylinder wall (3).
Abstract:
An internal combustion engine (10) operable in a premixed charge compression ignition mode and a method for operating the engine (10), the engine (10) including an engine body (12) with a piston assembly (14), a combustion chamber (16) formed in the engine body (12) by the piston assembly (14), an intake system (18) for delivering intake air to the combustion chamber (16) during an intake stroke, a mixing device that mixes a first fuel (23) with the intake air to provide a premixed charge of air and the first fuel (23), a direct fuel injector (26) adapted to directly inject a second fuel (27) into the combustion chamber (16), and a control system (20) adapted to control the direct fuel injector (26) in a manner to provide at least one early control injection, and preferably, a plurality of early control injections of the second fuel (27) into the combustion chamber (16) before start of combustion of the premixed charge.
Abstract:
The invention relates to a method for production of a piston for a reciprocating internal combustion engine, in particular, for an Otto-cycle engine with direct injection in a motor vehicle, whereby each piston is produced in a casting process. According to the invention, the volume VIST, formed by the surfaces on the combustion chamber side thereof, is determined for at least the first piston of a casting process batch, said volume VIST is compared with a desired volume VSOLL and, depending upon this comparison, the compression height KH is fixed with a difference from a set value such that VIST = VSOLL, within given tolerance allowances.