Fuel metering

Oxygen Sensor and the Closed Loop Fuel Metering System... 

The function of the oxygen sensor and the closed loop fuel metering system is to maintain the air and fuel mixture at the stoichiometric condition as it passes into the engine for combustion ie, there should be no excess air or excess fuel. The main purpose is to permit the TWC catalyst to operate effectively to control HC, CO, and NO emissions. The oxygen sensor is located in the exhaust system ahead of the catalyst so that it is exposed to the exhaust of aU cylinders (see Fig. 4). The sensor analyzes the combustion event after it happens. Therefore, the system is sometimes caUed a closed loop feedback system. There is an inherent time delay in such a system and thus the system is constandy correcting the air/fuel mixture cycles around the stoichiometric control point rather than maintaining a desired air/fuel mixture. 

The performance of the catalytic converter is affected by the conditions of air/fuel control provided by the fuel metering system. A slowly responding fuel metering system can dramatically decrease the conversion efficiency of the converter compared to a fast response multipoint fuel injection system. 

The emission control system for LPG is the same as is used for gasoline fueled engines with the exception of the fuel metering system. No evaporative emission system is required. Both Pt—Rh and Pd—Rh catalysts are good for emission control of LPG fuel exhaust. Pt provides the lowest light off temperature for C Hg. The sulfur content of LPG is also very low so that Pd catalysts perform very well. 

The capital, operating, maintenance and fuel costs come from four separate budgets, possibly accounted for by four different managers, so these budgets need to be adjusted. Separate fuel meters are needed to prove the savings, which might otherwise be held in question. 

Record makeup water meter, fuel meter, and steam chart readings Log all events... 

Computer-assisted molecular modeling package, 10 331-333 Computer-assisted tomography (CAT), sodium iodide in, 22 827 Computer-automated image analysis, as a particle counting method, 18 146-149 Computer-controlled viscometers, 21 732 Computer controller, closed loop fuel metering system, 10 57 Computer control loop, components of, 20 677-678... 

Pet foods Ruminant feeds Feedback control, purpose of, 20 666 Feedback controllers, 20 666-667 tuning and stability of, 20 694 Feedback control systems, 20 691-695 Feedback loops, between science and technology, 21 615 Feed-back system, closed loop fuel metering system, 10 56 Feed characterization, in reverse osmosis, 21 666... 

Fuel injection, diesel, 70 60-61 Fuel injection systems, 70 51 Fuel injector detergents, 72 408 409 Fuel metering system dynamic (lag time), 70 50... 

The amount of fuel metered is adjusted and controlled by the engine governor. All parts of the distributor pump are contained in one housing. Distributor pumps are lubricated by fuel which fills the housing. 

Turbines, Pelton wheels Liquids and gases 140 (See Volume 1, Section 6.3.9) Fuel metering in aircraft High repeatability. Can be used at high temperatures and pressures... 

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