摘要:
An apparatus 10 and a method for producing homogeneous charge compression ignition within a cylinder 14 by the controlled introduction of material into the cylinder 14 when the piston 16 reaches a top dead center position. The material may have a relatively high temperature and pressure and may comprise superheated water.
摘要:
A system for an internal combustion engine, the engine having an intake and exhaust manifold, the system comprising a heat exchanger configured to extract energy from at least a heat source that heats a first portion of intake air, a spark plug coupled to the engine, an intake passage configured to deliver said first portion of heated intake air to the engine and to deliver a second portion of intake air which bypasses said heat source, and a controller configured to direct said second portion of intake air to the engine at least when utilizing said spark plug to initiate combustion and flame propagation of an air-fuel mixture, and to at least temporarily cause said first portion of intake air to flow during said spark ignition combustion so that a temperature of said first portion of intake air is maintained above a selected value.
摘要:
A method of operating an internal combustion engine having a combustion chamber with a piston, comprising of adjusting an operating parameter of the engine so that a mixture of air and fuel in the combustion chamber approaches, but does not achieve, an autoignition temperature, and performing a spark from the spark plug so that said second mixture combusts; adjusting a timing of said spark from the spark plug; and adjusting an operating parameter to increase a correlation between said adjusted spark timing and timing of said combustion.
摘要:
A method of operating an internal combustion engine having a combustion chamber with a piston is disclosed. The method comprising during a first mode, adjusting an operating condition of the engine so that a first mixture of air and fuel in the combustion chamber attains an autoignition temperature and therefore combusts without performing a spark from the spark plug; and during a second mode, adjusting said operating condition of the engine so that a second mixture of air and fuel in the combustion chamber approaches, but does not achieve, said autoignition temperature; and performing a spark from the spark plug after top dead center of piston position so that said second mixture combusts.
摘要:
A method of operating an internal combustion engine having a combustion chamber with a piston and a spark plug, when transitioning between spark ignition combustion and autoignition combustion, creating a first mixture of air and fuel, adjusting an operating condition of the engine so that said first mixture of air and fuel in the combustion chamber approaches, but does not achieve, the autoignition temperature, and performing a spark from the spark plug so that at least a portion of said first mixture combusts to raise a remaining portion of said first mixture to said autoignition temperature.
摘要:
A system for an internal combustion engine, the engine having an intake and exhaust manifold, the system comprising of a heat exchanger configured to extract energy from engine exhaust gases; a catalyst coupled between said heat exchanger and the exhaust manifold of the engine; a spark plug in a cylinder of the engine; and a controller to operate the engine to perform spark ignition of a mixture of air and fuel in said cylinder during an engine cold start, where said air is heated with the energy before being inducted into said cylinder.
摘要:
An alumina-based lean NOx trap system for use in a HCCI engine exhaust is provided which includes at least one alumina-based lean NOx trap comprising a catalyst, an alumina NOx absorbent material, and optionally, from 0 to about 4 wt % of an alkaline earth metal oxide; and a conventional three-way catalyst. The lean NOx trap system substantially oxidizes HC and CO and converts at least a portion of NOx contained in the exhaust gas to N2 at a temperature between about 150° C. to about 250° C. in HCCI mode. The system also effectively removes HC, CO and NOx at high temperature when the engine is in SI mode (stoichiometric conditions). The alumina-based lean NOx trap in the system also undergoes efficient desulphurization and maintains its activity with extended use.
摘要翻译:提供了一种用于HCCI发动机排气中的氧化铝基贫NO x>陷阱系统,其包括至少一个氧化铝基稀空气阱,其包含催化剂,氧化铝 NO x吸收材料和任选的0至约4重量%的碱土金属氧化物; 和常规三元催化剂。 贫油收集系统基本上氧化HC和CO,并将废气中包含的NO x x N 2的至少一部分转化为N 2 N 在HCCI模式中温度在约150℃至约250℃之间。 当发动机处于SI模式(化学计量条件)时,该系统还可以在高温下有效地去除HC,CO和NO x x。 系统中的基于氧化铝的贫NO x陷阱也经历有效的脱硫并且在延长使用时保持其活性。
摘要:
A method of operating an internal combustion engine having a combustion chamber with a piston is disclosed. The method comprising during a first mode, adjusting an operating condition of the engine so that a first mixture of air and fuel in the combustion chamber attains an autoignition temperature and therefore combusts without performing a spark from the spark plug; and during a second mode, adjusting said operating condition of the engine so that a second mixture of air and fuel in the combustion chamber approaches, but does not achieve, said autoignition temperature; and performing a spark from the spark plug after top dead center of piston position so that said second mixture combusts.
摘要:
A method of operating an internal combustion engine having a combustion chamber with a piston, comprising of adjusting an operating parameter of the engine so that a mixture of air and fuel in the combustion chamber approaches, but does not achieve, an autoignition temperature, and performing a spark from the spark plug so that said second mixture combusts; adjusting a timing of said spark from the spark plug; and adjusting an operating parameter to increase a correlation between said adjusted spark timing and timing of said combustion.
摘要:
Method and system embody a valve timing strategy to control the autoignition timing of a four stroke internal combustion engine (10) operated in an HCCI mode at different engine operating conditions such as different engine speed and torque. A particular valve timing strategy varies lift timing of the intake valve (20) relative to the exhaust valve (28), or vice versa, and relative to top dead center in response to a change in engine torque, for example, to vary amount of trapped residual burned gas in the combustion chamber (12) flowing to an intake or exhaust port (16,18) and back to the combustion chamber during which the residual gas is cooled. Control of the flow of residual gas between the combustion chamber and intake or exhaust port and thus its temperature by the valve timing strategy, in turn, is used to control the temperature of the fresh air/residual gas/fuel mixture in the combustion chamber (12) and thus autoignition timing in response to a change in engine torque.