Appeal No. 2002-0470
Application No. 08/612,211
Hawkins teaches circuitry for controlling the direction of
rotation of a reversible electric motor to eliminate jolting
action caused by a sudden reversal of the motor. More
particularly, Hawkins’ circuitry functions such that
the current to the drive motor cannot be reversed to an
opposite direction while the motor continues operation
in a first direction. Once the motor slows to
predetermined speed, which may approximate near-stop
condition, the circuitry permits the voltage to operate
in the opposite direction thereby reversing the motor.
[abstract].
A detailed discussion of the operation of the control circuit of
Hawkins is found at column 5, line 52, through column 6, line 66.
While the method of operation of Hawkins does involve an
operator ordered change from a first drive mode to a second drive
mode (e.g., change of the motor from forward to reverse), said
method does not take into consideration the output torque ordered
by the operator vis-à-vis the actual output torque of the drive
motor in “locking out” the selected drive mode. Therefore,
operation of the Hawkins circuitry does not respond to step (d)
of claim 1, which requires making the actual output torque of the
motor substantially equal to that ordered in accordance with the
movement of the accelerator after, among other things, the output
torque ordered in accordance with the accelerator is decreased to
not more than the decreased actual output torque of the motor.
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