Appeal No. 2002-0584
Application 08/321,028
by engine operating parameters, such as engine speed
and desired torque. In the preferred embodiment, the
desired torque used for this look-up function will be
either MTQ 222 or PTQ 220 such that two PROVPW values
are obtained. The Provisional Pilot Pulse Width (PPP)
224 corresponds to the value of PTQ 220 while the
Provisional Main Pulse Width (PMP) 228 corresponds to
the value of MTQ 222. The values of PPP 224 and PMP
228 are the lesser of PROVPW and MAXPW, with PROVPW
corresponding to MTQ 222 or PTQ 220 as noted
immediately above [column 14, line 64, through column
15, line 22].
Takeuchi discloses a fuel injection control apparatus and
method for an internal combustion diesel engine 2 having a fuel
pump 5, a common fuel rail 4, a plurality of injectors 3 and an
ECU (electronic control unit) 6. The ECU 6 controls fuel
injection pressure in the common rail 4, and uses the fuel
injection pressure to determine fuel injection timings and
periods.
With respect to fuel injection pressure control, Takeuchi
teaches that
[t]he ECU 6 is associated with a rotational speed
sensor 7 and an accelerator sensor 8 each serving as a
driving condition detecting means. The rotational
speed sensor 7 detects an engine rotational speed Ne,
and the accelerator sensor 8 detects an accelerator
opening degree Acc representing an engine load.
Although not shown in the drawing, some other sensors
such as a cooling water temperature sensor, an intake
air temperature sensor, and an intake air pressure
sensor are provided as one of a driving condition
detecting means.
6
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