automotive-expert

Automotive Expert

Expert guidance for automotive systems, connected vehicles, fleet management, telematics, advanced driver assistance systems (ADAS), and automotive software development.

Core Concepts

Automotive Systems

• Telematics and fleet management
• Connected car platforms
• Advanced Driver Assistance Systems (ADAS)
• Electric Vehicle (EV) management
• Vehicle-to-Everything (V2X) communication
• Infotainment systems
• Diagnostic systems (OBD-II)

Technologies

• CAN bus and automotive networks
• AUTOSAR architecture
• Over-the-air (OTA) updates
• Autonomous driving systems
• Battery management systems
• Computer vision for ADAS
• Edge computing in vehicles

Standards and Protocols

• ISO 26262 (functional safety)
• AUTOSAR (automotive software architecture)
• J1939 (heavy-duty vehicle communication)
• UDS (Unified Diagnostic Services)
• SOME/IP (service-oriented middleware)
• MQTT for telematics
• CAN, LIN, FlexRay protocols

Connected Vehicle Platform

@dataclass
class VehicleTelemetry:
    """Real-time vehicle telemetry data"""
    vehicle_id: str
    timestamp: datetime
    location: tuple
    speed_kmh: float
    rpm: int
    engine_temp_c: float
    battery_voltage: float
    fuel_level_percent: float
    odometer_km: int
    dtc_codes: List[str]  # Diagnostic Trouble Codes

class ConnectedVehiclePlatform:
    """Connected car platform with OTA updates"""

    def __init__(self):
        self.vehicles = {}
        self.telemetry_buffer = []
        self.ota_updates = {}

    def process_telemetry(self, telemetry: VehicleTelemetry) -> dict:
        """Process incoming telemetry data"""
        self.telemetry_buffer.append(telemetry)

        # Analyze telemetry for anomalies
        alerts = []

        # Check engine temperature
        if telemetry.engine_temp_c > 110:
            alerts.append({
                'type': 'high_engine_temp',
                'severity': 'warning',
                'value': telemetry.engine_temp_c,
                'message': 'Engine temperature above normal'
            })

        # Check battery voltage
        if telemetry.battery_voltage < 12.0:
            alerts.append({
                'type': 'low_battery',
                'severity': 'warning',
                'value': telemetry.battery_voltage,
                'message': 'Battery voltage low'
            })

        # Check for diagnostic trouble codes
        if telemetry.dtc_codes:
            alerts.append({
                'type': 'dtc_codes',
                'severity': 'critical',
                'codes': telemetry.dtc_codes,
                'message': f'{len(telemetry.dtc_codes)} diagnostic code(s) detected'
            })

        # Check for harsh driving
        if len(self.telemetry_buffer) >= 2:
            prev = self.telemetry_buffer[-2]
            if telemetry.vehicle_id == prev.vehicle_id:
                time_diff = (telemetry.timestamp - prev.timestamp).total_seconds()
                if time_diff > 0:
                    acceleration = (telemetry.speed_kmh - prev.speed_kmh) / time_diff

                    if abs(acceleration) > 5:  # > 5 km/h per second
                        alerts.append({
                            'type': 'harsh_driving',
                            'severity': 'info',
                            'acceleration': acceleration,
                            'message': 'Harsh acceleration/braking detected'
                        })

        return {
            'vehicle_id': telemetry.vehicle_id,
            'timestamp': telemetry.timestamp.isoformat(),
            'alerts': alerts,
            'health_score': self._calculate_vehicle_health(telemetry)
        }

    def deploy_ota_update(self,
                         vehicle_ids: List[str],
                         update_package: dict) -> dict:
        """Deploy over-the-air software update"""
        update_id = self._generate_update_id()

        ota_update = {
            'update_id': update_id,
            'version': update_package['version'],
            'description': update_package['description'],
            'package_size_mb': update_package['size_mb'],
            'target_vehicles': vehicle_ids,
            'deployed_at': datetime.now(),
            'status_by_vehicle': {}
        }

        for vehicle_id in vehicle_ids:
            # Schedule update for vehicle
            ota_update['status_by_vehicle'][vehicle_id] = {
                'status': 'scheduled',
                'download_progress': 0,
                'install_progress': 0
            }

        self.ota_updates[update_id] = ota_update

        return {
            'update_id': update_id,
            'vehicles_targeted': len(vehicle_ids),
            'estimated_completion': 'Within 48 hours'
        }

    def diagnose_vehicle(self, vehicle_id: str, dtc_codes: List[str]) -> dict:
        """Diagnose vehicle issues from DTC codes"""
        diagnoses = []

        for code in dtc_codes:
            diagnosis = self._lookup_dtc_code(code)
            diagnoses.append(diagnosis)

        # Calculate severity
        max_severity = max(d['severity'] for d in diagnoses)

        return {
            'vehicle_id': vehicle_id,
            'dtc_codes': dtc_codes,
            'diagnoses': diagnoses,
            'overall_severity': max_severity,
            'service_recommended': max_severity in ['high', 'critical']
        }

    def _calculate_vehicle_health(self, telemetry: VehicleTelemetry) -> float:
        """Calculate overall vehicle health score"""
        score = 100.0

        # Engine temperature
        if telemetry.engine_temp_c > 110:
            score -= 15
        elif telemetry.engine_temp_c > 100:
            score -= 5

        # Battery voltage
        if telemetry.battery_voltage < 11.5:
            score -= 20
        elif telemetry.battery_voltage < 12.0:
            score -= 10

        # DTC codes
        score -= len(telemetry.dtc_codes) * 15

        return max(0.0, score)

    def _lookup_dtc_code(self, code: str) -> dict:
        """Lookup diagnostic trouble code"""
        # Simplified DTC lookup
        # In production, would use comprehensive OBD-II code database

        dtc_database = {
            'P0171': {
                'description': 'System Too Lean (Bank 1)',
                'severity': 'medium',
                'possible_causes': ['Vacuum leak', 'Faulty MAF sensor', 'Fuel filter clogged']
            },
            'P0300': {
                'description': 'Random/Multiple Cylinder Misfire Detected',
                'severity': 'high',
                'possible_causes': ['Faulty spark plugs', 'Ignition coil failure', 'Fuel injector issue']
            }
        }

        return dtc_database.get(code, {
            'description': f'Unknown code: {code}',
            'severity': 'medium',
            'possible_causes': ['Requires diagnostic scan']
        })

    def _generate_update_id(self) -> str:
        import uuid
        return f"OTA-{uuid.uuid4().hex[:8].upper()}"