THE BSPD IN FORMULA STUDENT CAR

1. Definition

The Brake System Plausibility Device (BSPD) is a component required for Formula Student competitions. Its function is to monitor the brake pressure and the position of the accelerator pedal to ensure the safety of the vehicle.

2. How it works?

The BSPD (Brake System Plausibility device) is a part of the shutdown system 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(shutdown circuit) 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.

This device is necessary for safety as it prevents situations where the vehicle continues to accelerate despite heavy braking. If such a situation is detected, the BSPD shall immediately turn off the power to the vehicle.

The whole project hardware is open source. The repository is available at https://github.com/PUT-Motorsport/PUTM_EV_BSPD_2024

JLCPCB's commitment to excellence and dedication to innovation perfectly align with our team's goals and aspirations. As a leading PCB fabrication house, JLCPCB's support is invaluable in helping us achieve our objectives in the competitive world of motorsport.

Get to JLCPCB now -> https://jlcpcb.com/HAR

PCB Schematic

Inner layers are just for simpler rooting having GND everywhere. It could be easily changed to a 2-layer PCB.

Now that we’ve got the PCB design, it’s time to order. For that, you just have to go to jlcpcb.com and click on the “Instant Quote” button.

You don’t have to worry about the settings here, because you can adjust everything in the new appeared tab.

JLCPCB is also a sponsor of this whole project (not only this PCB but all the PCBs in the car!). JLCPCB (Shenzhen JLC Electronics Co., Ltd.), is the largest PCB prototype enterprise in China and a high-tech manufacturer specializing in quick PCB prototype and small-batch PCB production. You can order a minimum of 5 PCBs for just $2 (2 layers), just enough to have a few test/spare ones. To get the PCB manufactured, just upload zipped Gerber files.

Then, you have multiple options to adjust the number of layers to your PCB color. Every option here is very clearly marked and described (when you hover over the question mark).

After making sure your PCB looks good – by clicking Gerber Viewer, you can now place the order at a reasonable price. In the case of this project, there is 2$ for 5, 2-layer PCBs and it’s only 3-4 days build time(the time is extended due to the chosen color). To place the order, click on the “SAVE TO CART” button. Fast and cheap, right?

The quality is always really satisfying so I sincerely recommend JLCPCB.