摘要:
A resonator is provided with a neck portion and a resonator main body. The resonator main body includes a main volume chamber communicated with an air intake duct of an internal combustion engine for a vehicle via the neck portion, and at least one sub-volume chamber directly connected to the main volume chamber. The resonator main body is configured to have both a Helmholtz-resonator functional part whose resonance frequency is determined based on a total volumetric capacity of the resonator main body, substantially corresponding to a summed value of a volume of the main volume chamber and a volume of the sub-volume chamber, and a side-branch-resonator functional part whose resonance frequency is determined based on a longitudinal length of the sub-volume chamber.
摘要:
The present invention relates to an internal combustion engine for motor vehicles. The engine can be operated in homogeneous charge compression ignition (HCCI) combustion mode and in conventional spark ignited (SI) combustion mode. For increasing volumetric efficiency and charge temperature during homogeneous charge compression ignition combustion operation timing, duration and lift of the intake valve and the exhaust valve respectively, being controlled such that an amount of residual exhaust gases is trapped in the cylinder of the engine. An intake valve is opened at a timed moment after top dead center during an induction stroke of the piston such that a pressure wave is generated from an intake manifold into the cylinder. The intake valve is closed at a timed moment before the pressure wave is reflected within the cylinder such that a charge mass of said pressure wave is retained within the cylinder.
摘要:
In a method for operating an internal combustion engine in which the angular locations where the fuel/air mix combustions takes place can be controlled by an adjustment of the inlet and outlet valve timing, the timing of at least one of the intake and exhaust valve opening phases is shifted depending on the engine speed so as to reduce engine emissions.
摘要:
In a four-stroke multicylinder internal combustion engine the exhaust space of each cylinder is connected to the intake of another cylinder out of phase with respect to the first by a half-cycle period via a communication pipe provided wwth nonreturn means. The underpressure due to the initial puff supercharges the second cylinder. Non-symmetrical nozzles constituting non-return means are provided in the exhaust space of each cylinder downstream of the mouth of the pipe in this exhaust space and in the intake space of each cylinder upstream of the position where the pipe opens into this intake space. Other non-return nozzles are arranged in the communication pipes. Each nozzle located in the exhaust space comprises an axial element having substantial thermal inertia and the pipe directs onto that element a flow of a fuel-air mixture having an adjustable air content, thereby reducing the atmospheric pollution. For increased efficiency, the nozzles may limit an annulus struck by the back flow and in which are provided inclined fins which cause rotation of said gas around the axis of this nozzle and prevent back flow from occuring. The invention is suitable for use in reciprocal piston and rotary piston engines.
摘要:
The invention relates to a device (6) for channeling a stream of feed gas for an internal combustion engine, said device (6) being able to be installed at least facing an exchanger (7) for the thermal conditioning of the stream of gas, the device comprises a first canal (15), referred to as central canal, for the circulation of the stream of gas, delimited by a first part (19) of a wall (17) and intended to channel the stream of gas toward a first zone (20) of a face (40) of the exchanger (7), said device comprising at least one second canal (16), referred to as lateral canal, for the circulation of the stream of gas, delimited by a second part (27) of the wall (17) and intended to channel the stream of gas toward a second zone (28) of said face (40) of the exchanger (7). The invention also relates to an intake airbox of an internal combustion engine and to an air inlet box of said airbox equipped with such a device. It further relates to an air intake module of an internal combustion engine comprising such an airbox.
摘要:
An exhaust device includes a plurality of independent exhaust passages connected to an exhaust port of one cylinder or a plurality of cylinders that are non-sequential in exhaust order, and a mixing pipe into which exhaust that has passed through the respective independent exhaust passages flows. The downstream ends of the respective independent exhaust passages are connected in a bundled form to the upstream end of the mixing pipe. A cavity expansion chamber is disposed in an exhaust passage downstream from the mixing pipe. The cavity expansion chamber is disposed in a position (at a distance L2) such that, in the intermediate speed range, a negative pressure wave generated due to an exhaust pressure wave generated by opening an exhaust valve being reflected by the cavity expansion chamber reaches the exhaust port during an overlap period of the exhaust valve and an intake valve of the cylinder.
摘要:
Pulsed plasma engine and method in which a noncombustible gas is introduced into an explosion chamber, the gas is ionized to form a plasma within the chamber, an electrical pulse is applied to the plasma to heat the plasma, the pulse is turned off to produce an explosive pressure pulse in the plasma, and the plasma is confined in the chamber by a magnetic field that directs the pressure pulse toward an output member which is driven by the pressure pulse.