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docs: add car_grip use case and grip analysis response format to README

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Jan-Peter von Hunnius 2026-06-24 10:21:38 +02:00
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README.md
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@ -201,8 +201,7 @@ A built-in HTTP API server runs on port 8080 for recording management and live t
| POST | `/api/recordings/{id}/stop` | Stop specific recording | | POST | `/api/recordings/{id}/stop` | Stop specific recording |
| DELETE | `/api/recordings/{id}` | Delete recording | | DELETE | `/api/recordings/{id}` | Delete recording |
| GET | `/api/recordings/{id}/data/{feed_name}` | Download raw feed JSONL | | GET | `/api/recordings/{id}/data/{feed_name}` | Download raw feed JSONL |
| GET | `/api/use-cases` | List valid use cases | | GET | `/api/use-cases` | List valid use cases || GET | `/api/games` | List supported games |
| GET | `/api/games` | List supported games |
| GET | `/api/sessions` | List all sessions | | GET | `/api/sessions` | List all sessions |
| POST | `/api/sessions` | Create analysis session | | POST | `/api/sessions` | Create analysis session |
| GET | `/api/sessions/{id}` | Get session details | | GET | `/api/sessions/{id}` | Get session details |
@ -302,6 +301,7 @@ Returns the updated session on success.
```json ```json
[ [
{ "id": "shift_points", "name": "ShiftPoints", "guidance": "1. Drive to a long straight..." }, { "id": "shift_points", "name": "ShiftPoints", "guidance": "1. Drive to a long straight..." },
{ "id": "car_grip", "name": "CarGrip", "guidance": "Drive 3-5 laps at race pace..." },
{ "id": "track_mapping", "name": "TrackMapping", "guidance": "1. Drive a complete lap..." } { "id": "track_mapping", "name": "TrackMapping", "guidance": "1. Drive a complete lap..." }
] ]
``` ```
@ -346,6 +346,35 @@ The characteristics endpoints aggregate shift-point analysis data across all com
} }
``` ```
### Car Grip Analysis Response
Produced by the `car_grip` use case. The analysis uses **envelope extraction** — for each 10 km/h speed bin, it finds the peak |lateral G|, peak acceleration G, and peak braking G. This builds the grip limit curve from whatever data you provide; the harder you drive, the more complete the profile.
```json
{
"summary": {
"max_lateral_g": 1.42,
"max_accel_g": 0.85,
"max_brake_g": 1.35,
"max_combined_g": 1.58,
"peak_lateral_speed_kmh": 120.0
},
"grip_envelope": [
{ "speed_kmh": 45.0, "max_lateral_g": 1.2, "max_accel_g": 0.8, "max_brake_g": 1.1, "sample_count": 340 }
],
"grip_circle": [
{ "longitudinal_g": 0.5, "lateral_g": -1.2 }
],
"steering_response": [
{ "steer": 0.15, "lateral_g": -1.1, "speed_kmh": 95.0 }
],
"runs_analyzed": 3,
"total_frames_analyzed": 8400
}
```
The `grip_envelope` array has one entry per populated speed bin. The `grip_circle` and `steering_response` arrays are downsampled scatter points (~800 each) for chart rendering.
### Shift Point Analysis Response ### Shift Point Analysis Response
```json ```json