Electronic fuel control system is
employed in automobiles to determine accurately and precisely the mass air flow
rate into the engine. Electronic fuel control system also performs the task of regulation
of fuel delivery with optimum precision. The fuel delivery regulation is in
such a way that the ratio of the mass of air to the mass of fuel in each
cylinder is as close as possible to stoichiometry. The main components of a
electronic fuel control system are throttle position sensor, mass air flow
sensor, ignition systems, fuel injectors, engine coolant sensor, engine
position sensor and exhaust gas oxygen sensor. Fuel injectors regulate fuel
delivery and ignition systems sets optimum ignition timing. Crankshaft angular
speed is measured by engine position sensor. Output signal generated by exhaust gas oxygen
sensor is dependent on the concentration of residual oxygen in the exhaust
after combustion.
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