Its function is to monitor the brake pressure and the position of the accelerator pedal to ensure the safety of the vehicle.

The BSPD (Brake System Plausibility device) is a part of the shutdown circuit (SDC) of the car, and it consists of a non-programmable circuit that prevents the driver from braking and accelerating at the same time, to prevent failures.
BSPD operates based on:
1. It's open by default.
2. It only opens when the brake system pressure is ≥30 bar and the accelerator pedal delivers ≥5 kW power to the motors.
3. The action of opening the SDC must occur if the implausibility is persistent for more than 500 ms.
4. The BSPD must be directly supplied from the LVMS
5. After being triggered, the BSPD may become closed again either by power-cycling the LVMS or if the opening condition is absent for longer than 10s, the BSPD resets itself.


PCB manufacturing supported by JLCPCB:
https://jlcpcb.com/HAR

Schematics and PCB layout available on Gi