摘要:
Combinations of split and valved exhaust ports are provided in a ported two cycle engine with divided emission control system to provide better control of the division of exhaust gas flow to the two converters.
摘要:
A two cycle engine wherein the scavenging gas is heated at low loads to improve scavenging. The gas may be heated by passage through finned passages in heat exchange relation with the exhaust ports with valves to direct the flow through unheated passages during higher load operation.
摘要:
The invention comprises an engine system that is selectively operative in an auto-ignition combustion mode. A control module monitors engine operating states and control engine operation. A control subsystem controls engine operation based upon the monitored engine operating states. The control subsystem operates the engine in the auto-ignition combustion mode, and determines an effective temperature of the cylinder structure of the internal combustion engine based upon the engine operating conditions. An engine operating point is determined. A feed-forward control scheme is executed based upon the effective temperature of the cylinder structure and the engine operating point. The effective temperature of the cylinder structure is determined by monitoring engine power for an elapsed period of time.
摘要:
A method to control combustion in an HCCI engine, to mitigate effects of combustion chamber deposits is detailed. The method comprises applying a specific surface coating to a combustion chamber surface. The surface coating has thermal properties substantially similar to the combustion chamber deposits. The thermal properties preferably include a) thermal conductivity, b) heat capacity, and c) thermal diffusivity. Applying a surface coating results in a reduction of combustion variability due to variation in combustion chamber deposits, and an improvement on combustion stability at low loads due to reduced heat loss. A preferred thermally insulating surface coating includes thermal parameters of a heat capacity in a range of 0.03×106 J/m3-K to 2.0×106 J/m3-K; a thermal conductivity in a range of 0.25 W/m-K to 2.5 W/m-K; and, a thermal diffusivity in a range of 1×10−7 m2/s to 8×10−6 m2/s.
摘要翻译:详细描述了一种控制HCCI发动机燃烧的方法,以减轻燃烧室沉积物的影响。 该方法包括将特定的表面涂层施加到燃烧室表面。 表面涂层具有与燃烧室沉积物基本相似的热性质。 热性质优选包括a)热导率,b)热容量,和c)热扩散率。 施加表面涂层导致由于燃烧室沉积物的变化而导致的燃烧变异性的降低,以及由于热损失减少而在低负载下的燃烧稳定性的改善。 优选的绝热表面涂层包括在0.03×10 6 J / m 3 -K至2.0×10 6 J / m 3 -K范围内的热容的热参数; 在0.25W / m-K至2.5W / m-K的范围内的热导率; 并且在1×10 -7 m 2 / s至8×10 -6 m 2 / s的范围内的热扩散率。
摘要:
A fuel injector has a spray nozzle with a plurality of spray discharge orifices, each of which has an elongated cross-section having a major axis orientable to a center electrode of a spark plug in the combustion chamber.
摘要:
A method and apparatus for controlling engine operation to compensate for effects of combustion chamber deposits (CCDs) on combustion in a controlled auto-ignition engine is presented. Control methodologies comprise operation of variable valve actuation, fuel injection, spark timing, and intake air and coolant temperature to dynamically compensate for the effect of CCDs. A sensitivity to core gas temperature and chamber wall thermal conditions is shown, which is correlatable to in-cylinder CCD formation. Intake charge or coolant temperature control can be used to compensate for CCD effects. An engine control scheme relies upon a parametric input that quantifies instantaneous CCD formation in the combustion chamber. The result is further applicable to control pre-ignition in a conventional spark-ignition engine.
摘要:
An engine with a cylinder inlet port controlled by a poppet valve has a flow directing vane on a shaft aligned with the valve stem upstream in the direction of flow. The vane is movable between a position aligned with the valve stem in which free flow is allowed and an angled position of less than 90.degree. to one side of the port whereby maximum charge swirl is obtained in the cylinder.
摘要:
A hybrid powertrain system includes reciprocating free-piston internal combustion engines, each including a linear alternator device configured to generate electric power. A control module determines mechanical and electrical power demands responsive to an operator torque request and a state of charge of an energy storage device. The control module operates the torque machine to generate an output torque responsive to the mechanical power demands and operates the reciprocating free-piston internal combustion engines to generate electric power responsive to the electrical power demands.
摘要:
A hybrid powertrain system includes reciprocating free-piston internal combustion engines, each including a linear alternator device configured to generate electric power. A control module determines mechanical and electrical power demands responsive to an operator torque request and a state of charge of an energy storage device. The control module operates the torque machine to generate an output torque responsive to the mechanical power demands and operates the reciprocating free-piston internal combustion engines to generate electric power responsive to the electrical power demands.
摘要:
A method to dynamically determine a parametric value for combustion chamber deposits (CCD), e.g. in a controlled auto-ignition engine, including in-situ evaluation of thickness of CCD, based on a sensor which monitors combustion in a homogeneous charge compression ignition engine. It includes a temperature sensor operative to monitor the combustion chamber, and a CCD parameter that is based upon a peak combustion temperature measured at a crank angle. A CCD parameter can also be determined utilizing an in-cylinder pressure monitor, wherein a combustion chamber deposit parameter is based upon crank angle location of a peak in-cylinder pressure parameter.