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
76 lines
1.5 KiB
Markdown
76 lines
1.5 KiB
Markdown
---
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active: true
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derived: false
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header: 'EPB ECU'
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level: 1.1
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normative: true
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reviewed: null
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links:
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- SYS-001
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- SYS-002
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- SYS-003
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- SYS-004
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- SYS-005
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- SYS-006
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- SYS-007
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- SYS-008
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- SYS-009
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- SYS-010
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asil: D
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---
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# SA-001: EPB ECU
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## Responsibility
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Central control unit of the electric parking brake. Contains all
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software components and the electronic actuation of the actuators.
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## System context
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```plantuml
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@startuml
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node "EPB ECU" as ECU
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node "Actuator left" as AL
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node "Actuator right" as AR
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node "Wheel-speed sensors (x4)" as WS
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node "Inclinometer" as IN
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node "EPB switch + LED" as SW
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node "CAN bus" as CAN
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node "Instrument cluster" as DI
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node "OBD tester" as OBD
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ECU --> AL : PWM, I-meas
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ECU --> AR : PWM, I-meas
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WS --> ECU : pulses
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IN --> ECU : SPI
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SW --> ECU : GPIO
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ECU --> SW : LED
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ECU <-> CAN
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CAN <-> DI
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CAN <-> OBD
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@enduml
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```
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## Interfaces
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| Interface | Type | Direction |
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|---------------|------------------|-----------|
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| Actuator L/R | PWM + shunt | I/O |
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| Wheel speed | Hall pulses | in |
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| Inclinometer | SPI | in |
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| Switch | GPIO debounced | in |
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| LED | GPIO | out |
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| CAN | ISO 11898 | I/O |
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## Subcomponents (allocated to software)
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Realised in software: all SWA elements SWA-001..SWA-010.
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## Non-functional properties
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- Worst-case reaction time (switch to actuator motion): 250 ms
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- Flash demand: < 256 KB
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- RAM demand: < 32 KB
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- Current: < 200 mA (standby) / < 30 A (actuator peak)
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