摘要:
The invention relates to a method for operating an internal combustion engine equipped with an exhaust emission control system. According to the invention, a rich operation of the internal combustion engine with a rich exhaust gas composition or a lean operation of the internal combustion engine with a lean exhaust gas composition is alternately set. In addition, the quantity of fuel introduced during a combustion cycle of the internal combustion engine is introduced by means of at least one pre-injection, at least one main injection and of at least one afterinjection. According to the invention, a pre-injection of fuel ensues during the rich operation at an early point in time in order to obtain a pre-homogenized mixture inside the combustion chamber. The quantity of fuel injected with the pre-injection is measured and an induction air throttling reduces a combustion chamber pressure such that a initially non-ignitable mixture exists inside the combustion chamber. A main injection is added to the pre-homogenized mixture inside the combustion chamber in order to improve the ignitability of the mixture present inside the combustion chamber. A combustion of the at least one pre-injection and of the at least one main injection ensues under an excess of oxygen, and the rich exhaust gas composition is set by the least one afterinjection.
摘要:
An apparatus for real-time measurement of mass, size and number of solid particles of particulate matter in engine exhaust has a catalytic stripper (14) to remove at least about 90% of a volatile fraction of the particulate matter and pass at least about 95% of a solid fraction of the particulate matter, and a micro-dilution tunnel (50) to cool the test medium after passing through the catalytic stripper (14) and prior to passing through a particle sizer and counter system (58). A method embodying the present invention includes removing a volatile fraction of the particulate matter carried in a sample test stream and comparing the sample after removal of the volatile fraction with a second sample in which the volatile fraction has not been removed. The difference between the two samples represents liquid phase of the volatile fraction of the tested exhaust gas.
摘要:
A combustion engine is provided having a rotating drive shaft. A planetary gear set links a rotating chamber, keyed to the drive shaft, to turbomachinery within the chamber. Fluid is fed to the chamber through an axial passage in the drive shaft and is compressed by a number of mechanisms, including a set of combustion channels initially driven by the drive shaft and its starter motor. Bubbles within the fluid are subjected to high pressures causing combustion to occur within the bubbles. Additional pressure created by the combustion of the bubbles drives the fluid to exert a net torque on the drive shaft, thereby generating power.
摘要:
The invention relates to a method for operating an internal combustion engine operable in compression ignition mode, said engine comprising a fuel supply means, a piston (5) in each cylinder (1) causing ignition during compression ignition mode, at least one inlet and one exhaust valve (6, 7), a control unit (4) that controls the valve timing and fuel quantity, and at least one sensor for measuring an engine operation parameter. The following steps are performed when switching from spark ignition to compression ignition mode:
controlling the exhaust and intake valves to perform a negative valve overlap in order to retain exhaust residual gas, determining a current combustion phasing timing, and correcting the combustion phasing by increasing the retained exhaust residual gas fraction by stepwise control of a combustion related parameter.
The invention further relates to an arrangement and a computer readable device for controlling the combustion process.
摘要:
A method and system for extending the load range of Homogeneous Charge Compression Ignition (HCCI) in an internal combustion engine includes detecting a current state of the engine, detecting a load demand placed on the engine, determining if the load demand is beyond a power generating capacity of a four-stroke engine cycle based on the current state of the engine and the load demand, and switching from the four-stroke engine cycle mode to a two-stroke engine cycle mode when it is determined that the load demand is beyond the capacity of the four-stroke engine cycle.
摘要:
In a double-ended barrel engine, a compression cylinder (3) and a combustion cylinder (2) share a common axis, with a combustion piston (20) and a compression piston (21) being interconnected by a connecting rod (22). The compression end of the engine includes a valve plate assembly with a generally flat valve plate (6) with intake and exhaust passages defined therethrough. An intake flapper valve (8) is disposed on the inner surface of the valve plate and selectively covers the intake passage. An exhaust flapper valve (8) is disposed on the outer surface of the valve plate and selectively covers the exhaust passage. Additional cylinders and pistons may be provided. A compression plenum may be provided in fluid communication with the exhaust passages from one or more compression cylinders, and be in fluid communication with the intake system for the combustion end of the engine. A wastegate (14) may be provided for venting the compression plenum.
摘要:
An internal combustion engine using variable compression ratio and variable fuel supply to one of two combustion chambers is presented. Varying the compression ratio is accomplished by changing the volume of a single combustion chamber (53) with an auxiliary piston (57) that is biased in an open position by spring (58). This, in combination with lean burning, results in a highly efficient prime mover particularly at the low torque outputs needed in passenger car applications. The relationship of compression ratio and fuel feed is varied with engine speed. Burning occurs in two stages, and this results in a clean exhaust. The invention allows very efficient throttling of two-cycle engines to be realized. A concept for supplying air to a two-cycle engine at very good efficiencies is also presented. The combination of these techniques can result in an engine for automotive use that is half the weight of conventional units with a thermal efficiency of 40 % or more at average engine output.
摘要:
Die Erfindung betrifft die Zündung eines Benzin-Luft-Gemisches in einer Brennkraftmaschine mit Hilfe eines Plasmas. Zur Erzeugung dieses Plasmas wird in einer Vorkammer vor dem Brennraum des jeweiligen Zylinders der Brennkraftmaschine ein geringer Teil des Benzin-Luft-Gemisches auf einen sehr hohen Druck (typisch 100 Bar) komprimiert, dabei adiabatisch auf über 800°C, also über die Selbstzündtemperatur des Benzins erhitzt und dabei entflammt. Das entflammte Gas wird über eine s-förmige Kapillare direkt in den Brennraum ins Zentrum einer dort vorher erzeugten Wolke aus einem Benzin-Luft-Gemisch (Schichtladung) injiziert. Hierdurch kommt es bei der Plasmazündung im Gegensatz zur Hochspannungszündung mit Zündkerze zu einer gleichmäßig im Volumen verteilten Entflammung des Benzin-Luft-Gemisches.
摘要:
The present system and method relate to power generation utilizing an exhaust side solid oxide fuel cell (110). Fuel is burned in an engine (125) in the presence of air. The engine exhaust passes through a solid oxide fuel cell (110) where it is consumed in the production of electricity and ionization of oxygen in an air stream (1) also introduced to the solid oxide fuel cell (110). The solid oxide fuel cell effluent fuel stream (21') and/or air stream (23') can be recycled through the engine (125), directed through a turbine (130) to recover additional energy therefrom, and/or passed through a catalytic converter (135). The resulting system exhaust has negligible to zero amounts of nitric oxides, hydrocarbons, carbon monoxide, and particulates.