Appeal No. 2002-0584
Application 08/321,028
“instructions, which are executed to perform various control and
information functions, as well as data tables, which contain
calibration values and parameters which characterize normal
engine operation” (column 6, lines 2 through 5).
Weisman’s Figure 2 illustrates a representative processing
sequence involving the determination of a desired engine torque
for a particular engine cycle. As described by Weisman,
[t]his typically involves a combination of retrieving
values from tables stored in ROM 28 and determining an
appropriate torque based on these values. The
retrieved values are a function of engine operating
parameters, such as engine RPM, throttle position, or
coolant temperature, such that a particular parameter
value, or combination of values, corresponds to a
memory location which contains the table entry. The
resulting, desired engine torque, determined by this
function is an initial value which is then communicated
to additional control functions for further processing
as described below.
In function 58, also shown in FIG. 2, the desired
engine torque determined by function 56 is used to
specify the quantity of fuel required to deliver that
desired torque based on a plurality of engine operating
conditions. In the preferred embodiment, the quantity
of fuel is represented as an angular displacement of
the crank required to energize a control solenoid
associated with an EUI 34 for allowing fuel to be
injected into the cylinder. Furthermore, as detailed
below, the desired torque can be attained by allocating
the quantity of fuel to be injected into a particular
cylinder, to more than one discrete fuel injection.
Thus, in any cylinder, during a single firing cycle,
fuel is injected during at least one discrete fuel
injection event. As is known, this method is effective
in reducing combustion noise when near idle speed which
is associated with ignition delay.
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