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A microprocessor 10 receives data from an engine crank sensor 12 and knock sensors 14 to control and coordinate the ignition and fuel distribution systems of a multi-cylinder gasoline engine.
English (United States)
This text was extracted from a PDF file.
This is the abbreviated version, containing approximately
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Microprocessor Engine Controller
A microprocessor 10 receives data from an engine crank sensor 12 and
knock sensors 14 to control and coordinate the ignition and fuel distribution
systems of a multi-cylinder gasoline engine.
In a six cylinder engine, the crank position sensor 12 includes magnetic
sensors mounted around the harmonic damper at 12, 4 and 8 o'clock to sense a
notch cut on the periphery of the disk-shaped damper. As the damper rotates,
the reluctance of each sensor undergoes an abrupt change each time the notch
passes the sensor to generate the position information.
A knock sensor 14 is used for each cylinder or the knock sensors can be
shared by groups of two or three cylinders. When knock sensors are shared, the
microprocessor 10 is used to compare knock sensor signals with engine position
sensor signals to determine which cylinder of a group is knocking.
Multiple spark coils 16 are used, each one dedicated to firing a pair of
companion cylinders. One coil fires cylinders 1 and 6, another fires cylinders 2
and 5, and a third fires cy linders 3 and 4. Each coil delivers a spark to its
cylinder pair simultaneously. Whichever cylinder of the pair is in its compression
stroke fires. The companion cylinder is on its exh stroke so the spark it receives
is a "waste spark". The microprocessor 10 receives the position and knock data
from the sensors 12 and 14, respectively, and adjusts the spark to each cylinder
individually to obtain maximum performance.