EBS Logic

SRR

Definitions/Meaning

T 14.10.1 The Emergency Brake System (EBS) is considered to be “activated”, if the power supply path defined in T 15.2.2 is cut after passing the initial checkup sequence (T 15.3.1). Brakes may only be released after performing manual steps.

Technical Requirements

•T 15.1.1 To run in autonomous mode, the vehicle must be equipped with an ASB (the term referring to Autonomous System Brake) that features an EBS as part of it (see T 15.2).

•Acording to A 6.4.6 working EBS is considered one of the minimum for a testing/operating environment to qualify as safe for the competition.

Therefore the technical inspection includes the EBS test which each vehicle must pass before it may partici- pate in any driverless dynamic event.

Electrical Requirements

•T 15.2.1 The EBS must only use passive systems with mechanical energy storage. Electrical power- loss at EBS must lead to a direct emergency brake maneuver with the performance specified in T 15.4.
• T 15.2.2 The EBS must be supplied by LVMS, ASMS, RES and a relay which is supplied by the SDC (parallel to the AIRs, but must not be delayed).

EBS Test

IN 11.2.1 The EBS performance will be tested dynamically and must demonstrate the performance described in T 15.4.

IN 11.2.2 The test will be performed in a straight line marked with cones similar to acceleration.

IN 11.2.3 During the brake test, the vehicle must accelerate in autonomous mode up to at least 40 km/h within 20 m. From the point where the RES is triggered, the vehicle must come to a safe stop within a maximum distance of 10 m.

IN 11.2.4 In case of wet track conditions, the stopping distance will be scaled by the officials dependent on the friction level of the track.

IN 11.2.5 The EBS test is conducted after all other elements of IN 11 have been passed.

PDR

Genral speaking Logic

The EBS must be supplied by LVMS, ASMS (master switch), RES (Remote Emergency System) and a relay which is supplied by the SDC (parallel to the AIRs, but must not be delayed).

The Emergency Brake System (EBS) is considered to be “activated”, if the power supply path defined above is cut after passing the initial checkup sequence (T 15.3.1).

Last year 22:

Logic of the board which was used in 22:

The EBS logic board is meant to control the part of the EBS activation valve, meaning QM1 and QM2 which appears on the flowchart down. First, we will explain that the EBS has two excat alike system for backup, so in case some parts won't work the car will still brake immediately in case of emergency. (you can it in the board above there are two circuits which look alike, get the same inputs and are parallel to one another)

The EBS logic board outputs due to its role will be the output of Qm1 and Qm2. The inputs (also includes inputs along the way like you can see in the board above) will be the SDC, the 12V (meaning the LVMS) and the EBS_valve_ctrl (RES).

efficiency/work approval

The design of last year is efficient and stands all the FG rulles but it only was cheaked on simulations and never on a driving car.

The cost of it was low.

Disadvantges/place to improve:

We need to use 12V instead of the 24V which you can see the last relay uses. So, or we can change the relay itself or we can find so logic for ampplify the 12V so it will supply the 24V needed.

Also, behind cheaking it on a driving car we sould see if it isn't sensitive to noise.

THE EBS IN THE CAR OF 22

CDR

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