EVERYTHING IN GOOD HANDS

The two sidesticks and their electrical functions are the key link in the HMI (Human Machine Interface) between the pilot and the TWIKE 5. Mechanically, these transmit the steering command via the linked handlebars and thrust links from the hands to the front axle. The levers are mechanically linked to each other and thus allow one-handed steering. In terms of driving dynamics, the steering system will drive straight ahead without an active steering command, as is familiar from the use of conventional passenger cars. During normal operation, the hands rest on the ergonomically adapted grip bodies and at the same time enable the thumb, index and middle fingers to communicate the regularly requested driving commands.

For example, an electrically redundant Hall sensor on the front side of the right sidestick picks up the acceleration request, which leads to an increase in speed when pressure is applied with the index finger. When pressure is applied to the lower part of the encoder, the electric drive recuperates and the speed is reduced. If neither finger gives a command, the vehicle just rolls out and is neither actively accelerated nor decelerated by the drive.

According to previous experience from the TWIKE 3, a driving condition that is often desired will be driving at a constant speed. This cruise control function is activated on the front of the left sidestick by briefly clicking an upper button with the index finger. Longer pressing of this button increases the target speed of the cruise control, which can be read as a numerical value in the display. The lower button deactivates the cruise control, reduces the target speed of the cruise control or sets a so-called downhill cruise control.

These explanations represent only a part of the functionalities of these two sidesticks. The complete description is an essential basis of the EE architecture (electric-electronic architecture), which is currently being worked on intensively in order to be transferred to the driver test vehicle after laboratory construction.