Fuel injection

About: Fuel injection is a research topic. Over the lifetime, 43871 publications have been published within this topic receiving 341154 citations. The topic is also known as: fuel injection system.

Method and apparatus for controlling overlap of two fuel shots in multi-shot fuel injection events

Abstract: A fuel injection control system and method for controlling a potential overlap of two fuel shots in a particular fuel injection event for an engine. A controller is coupled to a plurality of fuel injection devices associated with the engine and is operable to determine a cylinder first shot duration value based upon a predetermined nominal first shot duration value and a predetermined cylinder first shot duration trim value. The controller is further operable to retrieve a first shot advance value and a minimum second shot delay value associated with the cylinder and thereafter determine whether a first fuel shot in the particular fuel injection event will overlap in some fashion with a second fuel shot in that same fuel injection event based upon the cylinder first shot duration value and the retrieved values. The controller is further operable to either remove a portion of the first fuel shot that overlaps into a predetermined region of the particular fuel injection event or set the first fuel shot duration time to zero if it determines that a potential overlap situation will occur. The controller is further operable to load the cylinder first shot duration time thus determined for each cylinder in a computer readable medium associated with the respective cylinder during each fuel injection event.

Air-fuel ratio controller for water-cooled engine

Abstract: An air-fuel controller for a water-cooled engine provided with a mechanism for detecting a mixing ratio error which is a difference between a target mixing ratio and a real mixing ratio of fuel and air provided for the engine, a mechanism for performing learning related to a fuel injection amount based on the detected mixing ratio error, a memory for storing this learned value, a mechanism for computing a fuel injection correction amount based on this learned value, and a mechanism for outputting a fuel injection amount corrected by this correction amount to the fuel injector. This engine may be provided for example with a mechanism to set the difference between the mixing ratio error in the transient state and after the transient state has terminated as a transient mixing ratio error, and a mechanism to update the learned value stored in the memory such that the transient mixing ratio error is minimized. In this manner, learning precision in air-fuel ratio control is improved.

Piston of direct injection type internal combustion engine and its manufacture

Abstract: PROBLEM TO BE SOLVED: To favorably promote evaporation of ejected fuel even when an engine is operated under cold environment. SOLUTION: A fuel injection valve 13 ejects fuel toward a dished part 21 concavely formed in the top face of a piston 20. A low heat transfer member 22 formed of a titanium alloy sintered material is arranged on the bottom and side surfaces of the dished part 21 to which fuel is sprayed. Pores having an appropriate ratio are formed in the inside of the low heat transfer member 22 by the adjustment of a compressive load when the sintered material is pressurized and molded, and the heat insulation properties of the low heat transfer member 22 are controlled through these pores. COPYRIGHT: (C)2000,JPO

Fuel injection system

Abstract: A fuel injection system is provided for a gas turbine, comprising a mains airblast fuel injector having an annular shape, and inner and outer mains swirlers for swirling air past the mains airblast fuel injector. The inner and outer mains swirlers are concentric with the mains airblast fuel injector and are located radially inwardly and radially outwardly of the mains airblast fuel injector, respectively. The mains airblast fuel injector and the inner and outer mains swirlers are so arranged as to produce a fuel spray stream which expands from the mains airblast fuel injector and has a double flame front. The double flame front comprises flame fronts on both the radially inner and radially outer surfaces of the fuel spray stream.

Internal combustion engine with electronic air-fuel ratio control apparatus

Abstract: An electronic air-fuel ratio control apparatus in an internal combustion engine provided with an oxygen sensor emitting an output voltage in response to an oxygen concentration including the oxygen in nitrogen oxides in an exhaust gas from the engine. The apparatus controls the air-fuel ratio of an air-fuel mixture by a feedback correction-control based on a fuel injection quantity in an on-off manner. By using an oxygen sensor having a nitrogen oxides-reducing catalytic layer, the detection of a theoretical air-fuel ratio is performed on a richer side compared to the output on the detection of a theoretical air-fuel ratio by an oxygen sensor without the nitrogen oxides-reducing function, and is not changed even through the nitrogen oxides concentration changes. Accordingly, the feedback air-fuel ratio control acts to decrease the amount of nitrogen oxides so as to stabilixe the air-fuel ratio control. A first target air-fuel ratio for the air-fuel ratio feedback control is changed to a second target air-fuel ratio, which is richer than the first target air-fuel ratio when a high nitrogen oxide conentration in the exhaust gas is detected, or which is leaner than the first target air-fuel ratio when a high imcompletely burnt component concentration in the exhaust gas is detected.