3d:["$","title",null,{"children":"Initial EDA of iccu.observer OBD diagnostics dataset | Michael P. | Observable"}] 43:Tc76,html`

${sub.row["Model year"]} ${sub.row["Vehicle model"]}

Drive mode

${sub.row["Driving mode used"]}

12V battery type

${sub.row["12V battery type"]}

ICCU part number

${sub.row["ICCU part number"]}

Headlight setting

${sub.row["Headlight setting"]}

Interior humidity

${ (() => { const { min, max } = sub.data.rollup({ min: aq.op.min('[HVAC] Humidity sensor for automatic defogger (%)'), max: aq.op.max('[HVAC] Humidity sensor for automatic defogger (%)'), }).object(); return min + '% - ' + max + '%'; })()}

HV SoC

${ (() => { const socArray = sub.data.array('[VCMS] HV Battery SoC (%)').filter(s => s !== null); return socArray[0] + '% → ' + socArray[socArray.length - 1] + '%'; })()}

Operating time (h)

${sub.data.rollup({m: aq.op.mean('[BMS] Operating Time (Hours)')}).object().m.toFixed(2)}

Aux. battery SoC

${ (() => { const socArray = sub.data.array('[ICCU] Aux. Battery State of Charge (%)').filter(s => s !== null); return socArray[0] + '% → ' + socArray[socArray.length - 1] + '%'; })()}

Outdoor temperature

${ (() => { const socArray = sub.data.array('[HVAC] Outdoor Temperature (℃)').filter(s => s !== null); return socArray[0].toFixed(0) + ' ℃ → ' + socArray[socArray.length - 1].toFixed(0) + ' ℃'; })()}

Distance traveled

${ (() => { const socArray = sub.data.array('Distance travelled (km)').filter(s => s !== null); return socArray[socArray.length - 1].toFixed(2) + ' km'; })()}

${sub.row.Annotations}

`44:T6f8,html`

${Plot.plot({ height: 300, title: "LDC Output (black) vs Aux. Battery (gray) current", grid: true, x: {label: "Time (seconds)"}, y: {label: "Current (A)"}, marks: [ Plot.ruleY([0]), Plot.lineY(sub.data, {x: "time", y: "[ICCU] LDC Output Current (A)", tip: "x"}), Plot.lineY(sub.data, {x: "time", y: "[ICCU] Aux. Battery Current (A)", stroke: "gray", tip: "x"}), ] })} ${Plot.plot({ height: 300, title: "LDC Output (black) vs Aux. Battery (gray) voltage", grid: true, x: {label: "Time (seconds)"}, y: {label: "Voltage (V)"}, marks: [ Plot.lineY(sub.data, {x: "time", y: "[ICCU] LDC Output Voltage (V)", tip: "x"}), Plot.lineY(sub.data, {x: "time", y: "[ICCU] Aux. Battery Voltage (V)", stroke: "gray", tip: "x"}), ] })} ${Plot.plot({ height: 200, title: "Vehicle speed", grid: true, x: {label: "Time (seconds)"}, y: {label: "Speed (km/h)"}, marks: [ Plot.ruleY([0]), Plot.lineY(sub.data, {x: "time", y: "[VCS] Vehicle speed (high res.) (km/h)", tip: "x"}) ] })} ${Plot.plot({ height: 200, title: "LDC (black) vs indoor (gray) vs outdoor (blue) temperature", grid: true, x: {label: "Time (seconds)"}, y: {label: "Temperature (℃)"}, marks: [ Plot.lineY(sub.data, {x: "time", y: "[HVAC] Indoor Temperature (℃)", tip: "x", stroke: "gray"}), Plot.lineY(sub.data, {x: "time", y: "[ICCU] LDC Temperature (℃)", tip: "x"}), Plot.lineY(sub.data, {x: "time", y: "[HVAC] Outdoor Temperature (℃)", tip: "x", stroke: "blue"}), ] })}

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See [how.iccu.observer](https://how.iccu.observer) for instructions.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":44,"value":"viewof subSelection = Inputs.select(submissions.map(item => `${item[\"CSV files\"]} ${item[\"SHA1 of VIN\"]}`).sort(), {label: \"Select a submission\"})","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":49,"value":"async function readSubmission() {\n let [csvFilename, sha1] = subSelection.split(\" \");\n let submissionRow = submissions.find(row => row[\"CSV files\"] === csvFilename);\n return { row: submissionRow, data: await aq.loadCSV(`https://broad-well.github.io/iccu.observer/data/${sha1}/cleaned-${csvFilename}`) }\n}","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":59,"value":"sub = readSubmission()","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":139,"value":"$43","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":72,"value":"$44","pinned":false,"hidden":false,"mode":"ojs","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"$undefined","database":"$undefined"},{"id":93,"value":"## How does the LDC Output Current vary during a drive?\n\nOn February 16, I ran some experiments to verify the conditions under which the LDC alternates between charging and discharging the 12V battery. Outcomes from the experiments are attached to this notebook as a PDF (see right sidebar). In essence, given 12V SoC > 90%, it appears that the 2025+ ICCU LDC **does not discharge** the 12V battery during a drive if **any** of the conditions below are true:\n\n1. Low beam lights are on, whether manually or automatically\n2. Drive mode is set to Sport\n\nThe difference is most apparent in `2026-02-16-13-30-25.csv`. You can select that one above to see. Low beams were turned off about 8-10 minutes into the drive, and correspondingly, the LDC began alternating between charging and discharging the 12V battery. The cadence of this alternation is a function of regenerative braking.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":118,"value":"### Steady state\n\nWith the finding above, I set my headlight to Low beams instead of Auto.\nCheck out `2026-02-19-15-40-49.csv`, a long drive lasting over 2.5 hours. The LDC output current achieves steady state shortly after startup.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"},{"id":208,"value":"### Thermals\n\nThe LDC temperature is a function of the output current and the vehicle speed. Increased output current raises the temperature, while increased vehicle speed lowers the temperature (potentially by improving radiator circulation). If thermal loading is a plausible contributor to ICCU LDC degradation, then avoid high output current while parked.\n\nNote that logs from the vehicle starting with `d1de` show higher LDC temperatures compared to outdoor and indoor temperatures. Future work should investigate LDC temperature variations per vehicle as a potential sign of degradation.","pinned":false,"hidden":false,"mode":"md","author":"$undefined","summary":"$undefined","tool":"$undefined","providerMetadata":"$undefined","attachments":"$undefined","output":"","database":"$undefined"}],"files":"$W45","stdlib":"1"}} 42:"$41:body" 3c:E{"digest":"NEXT_REDIRECT;replace;/@broad-well/iccu_observer_initial_eda;307;"}