Stefan Lohmaier
a47e0aed3e
Phase 1 of full English translation: - generate_doorstop_items.py: all 55 items (SG/SYS/SWE/SA/SWA) rewritten in English - generate_landing_page.py: full UI labels, KPI cards, section headings in English - traceability.py: docstring, error messages, HTML headers in English - generate_test_report.py: report content + table headers in English - All 55 markdown items in safety/sg/, reqs/, arch/ regenerated in English Still to come: - demo-epb filled Word docs (PID, plans, safety, manuals, audit artefacts) - Code comments + test names + CI workflow step names - README + dev-process repo templates
1.5 KiB
1.5 KiB
active, derived, header, level, normative, reviewed, links, asil
| active | derived | header | level | normative | reviewed | links | asil | ||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| true | false | EPB ECU | 1.1 | true | null |
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D |
SA-001: EPB ECU
Responsibility
Central control unit of the electric parking brake. Contains all software components and the electronic actuation of the actuators.
System context
@startuml
node "EPB ECU" as ECU
node "Actuator left" as AL
node "Actuator right" as AR
node "Wheel-speed sensors (x4)" as WS
node "Inclinometer" as IN
node "EPB switch + LED" as SW
node "CAN bus" as CAN
node "Instrument cluster" as DI
node "OBD tester" as OBD
ECU --> AL : PWM, I-meas
ECU --> AR : PWM, I-meas
WS --> ECU : pulses
IN --> ECU : SPI
SW --> ECU : GPIO
ECU --> SW : LED
ECU <-> CAN
CAN <-> DI
CAN <-> OBD
@enduml
Interfaces
| Interface | Type | Direction |
|---|---|---|
| Actuator L/R | PWM + shunt | I/O |
| Wheel speed | Hall pulses | in |
| Inclinometer | SPI | in |
| Switch | GPIO debounced | in |
| LED | GPIO | out |
| CAN | ISO 11898 | I/O |
Subcomponents (allocated to software)
Realised in software: all SWA elements SWA-001..SWA-010.
Non-functional properties
- Worst-case reaction time (switch to actuator motion): 250 ms
- Flash demand: < 256 KB
- RAM demand: < 32 KB
- Current: < 200 mA (standby) / < 30 A (actuator peak)