Secondary air injection

About: Secondary air injection is a research topic. Over the lifetime, 11452 publications have been published within this topic receiving 112147 citations.

Fuel supply device of an engine

Abstract: A fuel supply device comprising a plurality of air assist type fuel injectors each having a nozzle opening, an assist air passage connected to the nozzle opening, and a fuel valve for injecting fuel into the assist air passage. The assist air passages of all of the fuel injectors are connected to a common air manifold via corresponding assist air supply control valves. The air manifold is connected to a fuel pressure regulator for controlling the pressure of fuel fed into the fuel valves. This pressure of fuel is maintained at a pressure higher than the pressure of air in the air manifold, by a fixed pressure, by the fuel pressure regulator.

The Influence of High Pressure Fuel injection on Performance and Exhaust Emissions of a High Speed Direct injection Diesel Engine

Abstract: Conventional direct injection diesel engines for cars or light duty trucks, equipped with injection pumps of conventional types, such as distributor injection pumps and inline injection pumps, and operating at compression ratios of 18-19, are capable of offering a fuel consumption benefit of some 15% compared to chamber diesel engines. In terms of noise and exhaust emissions, and also black smoke characteristics they are significantly inferior to the prechamber engine. They have a specific rated output which is some 20% lower. Only through the use of a compression ratio of 21 and high injection pressures it is possible to measurably diminish the drawbacks in respect of exhaust emissions and, to some extent, in respect of soot emissions. This in no way enhances the noise behaviour. For this reason, it is essential to employ measures such as injection rate shaping or split-injection. Satisfactory engine characteristics are best achieved if a pilot- injection is used. Such a pilo- injection is only feasible with an electronically controlled unit injector.

Liquid cooled fuel injection valve and method of operating a liquid cooled fuel injection valve

Abstract: A liquid cooled fuel injection valve (100) is operable to inject fuel directly into a combustion chamber through a nozzle orifice (112) provided in an injector tip. The fuel injection valve (100) further comprises a cooling system for draining fuel from a fuel cavity (114) disposed within the injector tip and a drain valve (130) that opens when pressure within the fuel cavity (114) is greater than a predetermined set point. Fuel drained through the cooling system is directed to a drain system that may be combined with drain passages typically found in fuel injection valves. In a preferred embodiment, the drain valve (130) is disposed within the fuel injection valve (100).

Hydraulic work machine provided with exhaust emission control device

Abstract: PURPOSE:To provide a hydraulic work machine wherein an engine can be stably operated to attain extending its life without generating blinding of HC and CO gas in an exhaust emission control device. CONSTITUTION:A pressure detector 16 for detecting exhaust resistance of an engine 1 is provided in an inlet side of an exhaust emission control device 2, and when a detection value of the pressure detector is increased to a predetermined prescribed value or more, in a control device 17, an engine output value is increased so s to increase an exhaust gas temperature of the engine 1 to a temperature or more capable of normally displaying an exhaust emission control function provided in the exhaust emission control device 2, so that combustion of HC and CO gas choking the exhaust emission control device is accelerated. In order to improve safety by increasing an engine output only when placed in an opened condition a control valve 7 interposed in a delivery pipe line of a variable displacement oil hydraulic pump 4, a neutral detecting switch is additionally provided in an operating lever of the control valve, to supervise whether the control valve is placed in a neutral position or not.

Idle speed control system for a two-cycle engine

Abstract: A two-cycle engine has a scavenge pump provided in an intake passage, and a fuel/air injector provided for injecting fuel directly in a cylinder of the engine together with air. A control unit has a calculator for calculating quantities of fuel and air injected from the fuel/air injector and for producing a fuel injection pulse width signal and an air injection pulse width signal based on the calculated quantities. Engine speed at idling state is compared with a desired idle speed and an error signal is produced. At least one of the pulse width signals is corrected with a correction value for controlling the injection quantity so as to cause the idle speed to converge to the desired idle speed.