Appeal No. 2002-0584
Application 08/321,028
The quantity of fuel determined by function 58 may
be adjusted by function 60, which performs cylinder
balancing, to enhance qualitative attributes such as
noise and vibration. For example, in the preferred
embodiment, if the engine speed is at or close to idle
speed, the pulse width signal to the integral fuel pump
injectors may be adjusted to more evenly distribute the
power contribution of each cylinder. . . .
. . .
Continuing now, with reference to FIG. 2, function
64 controls fuel delivery to the engine cylinders by
energizing the control solenoid of the appropriate EUI
34, at the appropriate time, for the period of time
determined by function 62 [column 7, line 11, through
column 8, line 11].
The delivery of fuel to a cylinder in two discrete
injections is known as split injection and consists of a first
pilot injection followed by a delay and then a second main
injection (see column 14, lines 50 through 63). In Weisman’s
words,
[a]s also shown in FIG. 6b, the Final Torque 214
is divided into a Pilot Torque (PTQ) 220 and a Main
Torque (MTQ) 222. The value of PTQ 220 is the lesser
of the Final Torque 214 and a pilot torque limiting
value, EPIPTQ, not shown. The value of MTQ 222 is
simply PTQ 220 subtracted from the Final Torque 214.
If split injection is disabled, then Final Torque 214
equals PTQ 220 and MTQ 222 equals zero.
The quantity of fuel to be delivered is
represented by the amount of angular displacement of
the crank, preferably measured in degrees, during which
a control solenoid of an appropriate EUI 34 is
energized. This signal is referred to as the fuel
pulse width. Two Provisional Pulse Width (PROVPW)
values are calculated, subject to further adjustment by
other functions such as Cylinder Balancing 230, and
limited by a maximum pulse width parameter, MAXPW. The
value of PROVPW is found in a look-up table referenced
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Last modified: November 3, 2007