摘要:
A method and apparatus for operating a compression ignition engine having a cylinder wall, a piston, and a head defining a combustion chamber. The method and apparatus includes delivering fuel substantially uniformly into the combustion chamber, the fuel being dispersed throughout the combustion chamber and spaced from the cylinder wall, delivering an oxidant into the combustion chamber sufficient to support combustion at a first predetermined combustion duration, and delivering a diluent into the combustion chamber sufficient to change the first predetermined combustion duration to a second predetermined combustion duration different from the first predetermined combustion duration.
摘要:
A fuel injection control system and method for delivering multiple fuel injections to a cylinder of an engine during a fuel injection event based upon engine operating conditions, the control system including an electronic controller coupled to an electronically controlled fuel injector, and a plurality of sensors coupled to the controller for inputting certain signals representative of certain engine operating conditions of the engine, the controller being operable to output a fuel injection signal to the fuel injector to deliver a first, a second, and a third fuel shot to the cylinder during a fuel injection event based upon the sensor signals. The controller also delivers each of the multiple fuel injection shots within defined cylinder piston displacement parameters during a particular piston stroke, within defined fuel apportionment limits, and within defined delay limits between each respective fuel shot so as to control exhaust emissions.
摘要:
An internal combustion engine exhaust gas recirculation (EGR) system includes an exhaust gas manifold back pressure valve insert assembly which has an exhaust gas recirculation (EGR) conduit interposed between exhaust manifold structure of the engine and atmospheric exhaust structure, and a valve mechanism disposed within the exhaust gas recirculation (EGR) conduit and movable between a fully closed position at which all exhaust gases from the engine pass to atmospheric exhaust through the atmospheric exhaust structure, and a fully opened position at which the valve mechanism partially occludes the atmospheric exhaust structure such that a sufficiently large back pressure is developed with respect to the atmospheric exhaust structure such that exhaust gases are forced through the exhaust gas recirculation (EGR) conduit.
摘要:
A fuel injection control system and method for delivering multiple fuel injections to a cylinder of an engine during a fuel injection event based upon engine operating conditions, the control system including an electronic controller coupled to an electrically controlled fuel injector, and a plurality of sensors coupled to the controller for inputting certain signals representative of certain engine operating conditions of the engine, the controller being operable to output a fuel injection signal to the fuel injector to deliver a first, a second, and a third fuel shot to the cylinder during a fuel injection event based upon the sensor signals. The controller also delivers each of the multiple fuel injection shots within defined cylinder piston displacement parameters during a particular piston stroke, within defined fuel apportionment limits, and within defined delay limits between each respective fuel shot so as to control exhaust emissions.
摘要:
Engines and methods of controlling an engine may involve one or more cams associated with engine intake and/or exhaust valves. In some examples, shifting the rotational phase of one or more cams advances and/or delays timing of the opening and/or closing of valves. Timing of valve closing/opening and possible use of an air supply system may enable engine operation according to a Miller cycle.
摘要:
A method of simulating performance characteristics of a product to be manufactured includes identifying a plurality of simulation modules each representative of one or more components of the product. The method also includes linking the plurality of simulation modules together to provide a model capable of generating an output associated with one or more performance characteristics of the product and running at least some of the simulation models in parallel to provide performance information related to the one or more performance characteristics of the product. The method can also include outputting the performance information.
摘要:
Engines and methods of controlling an engine may involve one or more fluidically driven actuators associated with engine intake and/or exhaust valves. In some examples, the actuators may be placed in flow communication with high pressure fluid from one source and/or low pressure fluid from another. Timing of valve closing/opening and use of an air supply system may enable engine operation according to a Miller cycle.
摘要:
An apparatus and method for causing a fuel injector to overcome its inherent fuel injection pressure threshold long enough to completely inject a predetermined volume of fuel during each fuel shot associated with a particular fuel injection event. The fuel injector is in electrical communication with an electronic controller for receiving control signals of pre-calculated timing and duration therefrom. Furthermore, the fuel injector is in mechanical communication with a cam follower. A camshaft has a cam profile in mechanical communication with the cam follower, the cam profile including at least one lobe operable to generate pressure within the fuel injector sufficient to overcome the fuel injection pressure threshold in predetermined intervals in conjunction with the control signal of the electronic controller.
摘要:
An exhaust system for receiving exhaust gas of an engine is provided. The exhaust system comprises a cooler configured to cool at least a portion of exhaust gas, a pressure sensor configured to measure an exhaust pressure drop across the cooler, and a controller configured to determine exhaust flowrate as a function the measured pressure drop across the cooler. Also provided is a method for operating an engine. The method comprises the steps of combusting a fuel and air mixture, exhausting at least some of the combusted fuel and air mixture as exhaust gas to an exhaust system of an engine, cooling at least some of the combusted exhaust gas in a cooler, measuring pressure drop of the exhaust gas across the cooler, and determining a flowrate of the exhaust gas across the cooler as a function of pressure drop.
摘要:
A compound turbocharger is provided, including at least one housing. A first turbocharger having an outer shaft is disposed within the housing, and a second turbocharger is provided having an inner shaft co-axial with and extending within the outer shaft. At least one displacement limiter is disposed at a selected position along the length of the outer shaft. A method of reducing vibrational amplitude in an inner shaft of a coaxial shaft assembly is further provided, including the step of operably positioning at least one displacement limiter at a selected position along a length of the outer shaft.