Rasa Beta Operating Manual
7. Safety systems overview
The following safety systems are implemented on Riversimple vehicles, including the Rasa Beta,
which are described in the following sections:
●
Crash detection;
●
Hydrogen leak detection;
●
Powertrain isolation.
7.1 Crash detection
Inertia switches are fitted on the Rasa Betas. If the Rasa Beta is involved in a collision the switch will
cut power to the powertrain contactors and hydrogen solenoid, isolating both the high voltage
electronics and hydrogen supply. The fuel cell will continue to run until residual hydrogen in the
supply lines is depleted.
If the inertia switch has been activated the Rasa Beta should be recommissioned for use by a trained
technician.
7.2Hydrogen leak detection
Hydrogen leak detectors are installed on the Rasa Beta (see Figure 31). One sensor is installed on the
roof of the rear subframe, which is where all hydrogen components are installed. Detectors are set
to enter an alarm state if a concentration of hydrogen greater than 4000 ppm (parts per million) is
detected (10% of the Lower Explosive Limit) or if the detector enters an error state.
Figure 31: NTK EGAS-HL Hydrogen Sensors
If the leak detector enters an alarm state the following will occur:
20