With reference to Figure 2B, Nakamoto discloses the following:
Reference character F designates a manually operated
switch which is comprised of an automatic control switch 22
adapted to be manually turned on or off by the operator for
switching the controller C into automatic mode; a manual
brake application switch 23 adapted to be turned on or off by
the operator so as to put the parking brake applying
operation of the controller C into manual mode; and a
manual brake releasing switch 24 adapted to be turned on or
off by the operator so as to put the parking brake releasing
operation of the controller C into manual mode. These
switches 22 to 24, when turned on, produce output signals
which are fed to the controller C [column 5, lines 39-51].
Once the CPU 25 has determined, based on signals from vehicle sensors, that
the foot brake system is operating normally, that brake fluid levels are normal and that
the vehicle speed is such that actuation of the parking brake is permitted, the CPU
determines whether the manual brake application switch 23 is turned on. If the manual
brake application switch 23 is turned on, the CPU acts to produce a brake application
command signal in accordance with a sub-flow of operation, as shown in Figure 4. As
disclosed in column 8, in the first full paragraph,
[s]pecifically, in the sub-flow for controlling the operation of
the parking brake A, as viewed in FIG. 4, the CPU 25 first
measures the angle of inclination of the vehicle with respect
to the horizontal by means of the inclination signal from the
inclination sensor interface 31, and then sets the operation
force of the parking brake A required for the inclination
measured. Thereafter, a brake application command signal
is put out by the CPU 25 to the motor 5 of the
electromagnetic means B whereby the motor 5 is drivento
rotate in the forward direction. The torque of the motor 5 is
compared with the set force for the parking brake A and the
motor 5 is operated until the motor torque increases to
exceed the set force of the parking brake A. At the instant
when the motor torque reaches the set force for the parking
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Last modified: November 3, 2007