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2. System Functionality
The Chair frame will be kept horizontal with the information out of 2 sensors.
One gyro is build on the Sensor control board.
This sensor (also called ‘lift sensor’ or ‘drive sensor’) measures the rotation of the drive unit.
The measured rotation is basically used as data to run the level motor.
The second sensor (called the ‘Chair sensor’) has the function to check and compensate the angle of
the chair frame.
A Tilt sensor is build in, to stop the lift when the chair frame is more than 5 degrees out of level.
No information of this sensor is used, to keep the chair horizontal.
Only when the normal electronics fail this sensor will prevent unwanted behaviour.
In the lift there are 3 PCB’s which are responsible for the basic functionality of the lift.
This PCB’s are called main board, level board and sensor control board.
MAIN MOTOR
DRIVE UNIT
BRAKE
MAIN MOTOR
DRIVE UNIT
MOTOR
LEVEL
Simplified Block diagram
The Sensor control-board uses the sensor information to keep the chair horizontal.
The Sensor control-board controls the speed and direction of the level motor through the level board.
The level board has only electronics for running the level motor.
In the system this board is directly mounted on top of the main board.
Via board to board connectors this board is connected to the main board.
The main board has the electronics to drive the main motor and connects and monitors all safety
related switches like switch armrest on/off, swivel seat switch and the sensitive edges.
Also the circuitry for charging the batteries is on this board.
All these 3 boards are connected via can-interface. Via this interface the sensor control board asks
(get) status of each motor control separate and controls the level motor.
The sensor control board is also able to slow down or stop the main motor through this interface.
A dual safety-line runs through the 3 PCB’s
Each PCB could decide to open these lines when an error occurs.
When this fails the Tilt-sensor will stop the system when the chair will go more then 5 degrees out of
level.
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