Specifications

Page 52 of 106 Basic Rider Optimization Training for the Segway HT
Instructor Guide and Participant Workbook Rev 3.5i - January 2004
© Segway LLC 2002 P/N 1707100001aa
Normal Operation
Reduced Performance (transient conditions)
Speed Limited or reduced to zero:
> Fewer than three Rider Detect Sensors depressed
> Tilt sensors saturated (excessive lateral acceleration or roll angle)
> System too hot
> Battery Packs low or not enough power to perform the requested action (riding too fast up or
down a hill)
> Battery Packs too full to accept more energy from regenerative braking while traveling down a hill
Safety Shutdown (Critical component malfunctions/a failure of any of the following
redundant subsystems)
Deceleration to zero speed, stick shake, red frown display
> Battery Packs completely discharged or malfunction
> Motor
> Controller Board
> Balance Sensor Assembly (BSA)
> Steering Grip or Mode Button
> System in Handlebar
> Control Shaft cord
> Connections between redundant parts
Draw an arrow from “Normal Operations” to “Reduced Performance” and another arrow from
“Reduced Performance” back to “Normal Operations”
Say: When the transient condition ceases to exist, the Segway HT returns to normal operation.
Draw an arrow from “Reduced Performance” to “Safety Shutdown.”
Say: If the transient condition progresses into a critical malfunction, the Segway HT will perform a
Safety Shutdown
Draw an arrow from “Normal Operations” to “Safety Shutdown.”
Say: In case of a critical component malfunction, the Segway HT will perform a Safety Shutdown.
Speed Limiter
Like your body, the Segway HT has a top speed. The Segway HT’s top speed is limited by many
conditions, including:
> The Key used to power on
The Key governs the top speed:
> Steepness of a hill
Reduced capability includes the inability to adequately produce torque and speed depending on
the steepness of the hill.
> Bumpy terrain
If the Balance Sensor Assembly gets dizzy from riding on bumpy terrain or spinning in circles, the
Segway HT slows down until the Balance Sensor Assembly can assess the Segway HT’s position
correctly. Reduced capability includes the inability to measure inertial data.
> Battery Pack charge
If Battery Packs are fully charged: When you go downhill the output shaft of the motor spins,
generating energy, which is then stored in the Battery Packs and reused next time you require
energy. This feature is called regenerative braking. If the Battery Packs are at full charge, and
you go downhill, the energy being generated has no place to go. The speed limiter engages to
slow the Segway HT down so less electricity will be generated.