Appeal No. 2002-0584
Application 08/321,028
The ECU 6 receives the information detected by the
driving condition detecting sensors (7, 8,-) and
performs a feedback control of the common rail pressure
to obtain an optimum fuel injection pressure, so that
the combustion condition of the diesel engine 2 can be
optimized in accordance with the detected driving
condition [column 6, lines 52 through 68].
The ECU 6 also controls fuel injection based on a number of
sensed parameters such as engine rotational speed Ne, accelerator
opening degree Acc, cooling water temperature Tw, intake air
temperature Ta, intake air pressure Pa and common rail fuel
pressure Pc (see column 7, line 1 et seq.). Of particular
interest is the role common rail fuel pressure Pc plays in
determining injection timings and periods (see column 8, lines 58
through 68; column 10, lines 33 through 42; and column 14, lines
41 through 50). As explained by Takeuchi (see column 15, lines 1
through 5), a positive correlation exists between the common rail
pressure and the amount of fuel injected per unit time.
II. Claim 1
Weisman teaches, or would have suggested, a method meeting
all of the limitations in independent claim 1 (reproduced above)
except for those relating to injection pressure. The appellant’s
contention that Weisman also lacks response to the limitation in
the claim requiring the step of determining a first quantity of
fuel to be delivered by the fuel injector based on the first
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