摘要:
A water injection system (WIS) for diesel engines that reduces NOx, PM and CO2 emissions is provided. Water is injected into the combustion air stream before cylinders in a predetermined proportion to fuel. The present invention utilizes a special water purification element, an oscillating pump, an electronic means to control both water flow and the size of water droplets, a means to prevent water from freezing in cold ambient temperatures, a plurality of special sensors to control water flow in response to rapid load variation, and a means for automatically switching between on and off operations.
摘要:
An HCCI engine includes a power piston disposed in a cylinder and structure for increasing compression in the cylinder, independently of the power piston, so as to cause ignition of a fuel/air mixture in the cylinder. In one possible embodiment, compression is increased by firing a spring-loaded ignition piston positioned adjacent to the cylinder at the desired time. In another possible embodiment, compression is increased by generating a sound wave at the desired time.
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:
There are provided a diesel engine that injects fuel into air compressed in cylinders and combusts the fuel by spontaneous ignition, and a control unit that sets the fuel injection timing to an earlier time point than the compression top dead center to premix air and fuel and combusts the air-fuel mixture compressed in the cylinders by spontaneous ignition. The control unit injects the fuel to be injected in an early stage in a plurality of stages according to the operation state of the engine and individually adjusts the injection pressures of their respective stages according to the gas density and the gas temperature in the corresponding cylinder.
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.
摘要:
A water injection system (WIS) for diesel engines that reduces NOx, PM and CO2 emissions is provided. Water is injected into the combustion air stream before cylinders in a predetermined proportion to fuel. The present invention utilizes a special water purification element, an oscillating pump, an electronic means to control both water flow and the size of water droplets, a means to prevent water from freezing in cold ambient temperatures, a plurality of special sensors to control water flow in response to rapid load variation, and a means for automatically switching between on and off operations.
摘要:
In an engine cogeneration system in which power generators 5 to 8 are driven by a plurality of engines 1 to 4 to thereby supply electric power to power load 22 of a general household, at the same time, heat produced by cooling each of the engines 1 to 4 and heat generated from the exhaust gas are recovered by heat exchangers 18 and 19 to be stored as hot water into a hot-water tank 20 to supply heat to heat load 21 of the general household, the amount of power to be supplied and of the amount of heat to be supplied are controlled by a number of the engines 1 to 4 and the combustion modes of these engines 1 to 4. This engine cogeneration system can follow both the head demand and power demand in a high efficiency.
摘要:
The invention provides a method for controlling a compression ignition internal combustion engine, which can easily deal with a wide range of demand loads with a single fuel. The compression ignition internal combustion engine includes a fuel containing an ignition improver, and as the demand load increases, part of the ignition improver contained in the fuel is changed into a material having a reduced ignitability improvement capability, and the fuel having reduced ignitability is supplied to the compression ignition internal combustion engine. A fuel having part of the ignition improver changed into a material having a reduced ignitability improvement capability, and thus having reduced ignitability, and a fuel with the ignitability improvement capability of the ignition improver maintained are mixed together in any ratio, and supplied to the compression ignition internal combustion engine.
摘要:
A combustion chamber for an internal combustion engine includes a closed end cylinder having an axis. A piston is reciprocable in the cylinder and includes a generally flat rim having an inner edge surrounding a recessed bowl into which the fuel is primarily injected, the bowl having a floor and a surrounding side formed by an arcuate surface connecting tangentially with the floor and extending to the rim inner edge.A spark plug has a centerline through the spark gap and is offset to one side of the cylinder axis with the spark gap extending into the combustion chamber toward the axis. A fuel injector is offset to an opposite side of the axis with the spray tip aimed to direct a generally conical fuel spray into the piston bowl with a portion of the fuel spray passing near the spark gap. Various dimensional characteristics are disclosed.
摘要:
An engine is operated in accordance with a plurality of operation modes obtained by combining one of a 4-cycle mode and a 2-cycle mode with one of a combustion ignition control where an ignition is performed with an ignition unit and a self ignition priority control including the ignition performed without the ignition unit. Upon switching of the operation mode, a transition cycle is performed once between a first operation mode before switching of the operation mode and a second operation mode after switching of the operation mode. Timing for operating an intake valve or an exhaust valve in the transition cycle is different from that in the second operation mode. The combustion ignition control is executed in one of the combustion chambers where the single operation of the transition cycle is completed until a single cycle of each transient cycle in the rest of the combustion chambers is terminated.