automotive-china-l2-adas-compliance

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# Automotive China L2 Adas Compliance

## China L2 Adas Compliance

# China L2 ADAS Compliance — Combined Driving Assistance System Safety Requirements

## Overview

Expert guidance for compliance with China's mandatory national standard (GB) for L2 Combined Driving Assistance Systems (组合驾驶辅助系统). This standard covers safety requirements for vehicles equipped with L2 functions including ACC, LKA, LCC, TJA, ICA, and their combinations. Enforcement begins in 2026.

## Regulatory Context

### Standard Hierarchy

```
中国L2标准体系
├── GB XXXX — 组合驾驶辅助系统安全要求（强制性国标，2026年执行）
│   ├── 系统安全通用要求
│   ├── 功能安全要求（基于ISO 26262）
│   ├── 预期功能安全要求（基于ISO 21448）
│   ├── 人机交互要求
│   ├── 网络安全要求
│   └── 测试方法与评价规程
├── GB/T — 组合驾驶辅助性能要求与试验方法（推荐性国标）
└── 行业标准/团体标准
    ├── C-NCAP 2024 ADAS评分规程
    └── 中国智能网联汽车产品准入规范
```

### Key Regulatory Bodies

- **MIIT (工信部)**: Vehicle type approval and access management
- **SAC/TC114 (全国汽车标准化技术委员会)**: Standard development
- **CATARC (中汽中心)**: Testing and certification
- **C-NCAP**: Safety rating with ADAS scoring

## Covered L2 Functions

### Function Definitions

| Function | Chinese Name | Description |
|----------|-------------|-------------|
| **ACC** | 自适应巡航控制 | Adaptive Cruise Control with stop & go |
| **LKA** | 车道保持辅助 | Lane Keeping Assistance |
| **LCC** | 车道居中控制 | Lane Centering Control |
| **TJA** | 交通拥堵辅助 | Traffic Jam Assist |
| **ICA** | 集成巡航辅助 | Integrated Cruise Assist (ACC + LCC) |
| **AEB** | 自动紧急制动 | Autonomous Emergency Braking |
| **LDW** | 车道偏离预警 | Lane Departure Warning |
| **BSD** | 盲区监测 | Blind Spot Detection |
| **FCTA** | 前方交叉交通预警 | Front Cross Traffic Alert |
| **RCTA** | 后方交叉交通预警 | Rear Cross Traffic Alert |

### Function Combination Matrix

```
组合驾驶辅助系统功能组合
─────────────────────────────────────────
纵向控制        ×    横向控制    =    组合功能
─────────────────────────────────────────
ACC            +    LKA/LCC    =    ICA/TJA
ACC (Stop&Go)  +    LCC        =    HWA (Highway Assist)
ACC + AEB      +    LKA + LDW  =    Full L2 Package
─────────────────────────────────────────
```

## Core Compliance Requirements

### 1. System Safety General Requirements

```
系统安全通用要求
├── 运行设计域（ODD）定义
│   ├── 道路类型：高速公路、城市快速路、城市道路
│   ├── 速度范围：0-130 km/h（ACC）, 0-120 km/h（LCC）
│   ├── 天气条件：晴天、雨天（中雨以下）、雾天（能见度>100m）
│   └── 时间条件：昼夜均可
├── 系统状态管理
│   ├── 正常运行状态
│   ├── 功能降级状态
│   ├── 最小风险状态（MRC）
│   └── 安全停车状态
├── 故障检测与响应
│   ├── 传感器故障检测时间 < 200ms
│   ├── 系统故障响应时间 < 500ms
│   └── 安全状态切换时间 < 1s
└── 系统可用性要求
    ├── 系统可用率 > 99.5%
    └── 虚警率 < 0.1次/100km
```

### 2. Functional Safety Requirements (ISO 26262 Alignment)

```python
# ASIL Classification for L2 Functions
asil_classification = {
    "ACC_acceleration": "ASIL_B",
    "ACC_deceleration": "ASIL_C",
    "AEB": "ASIL_D",
    "LKA_steering_torque": "ASIL_B",
    "LCC_lateral_control": "ASIL_B",
    "driver_monitoring": "ASIL_B",
    "system_override": "ASIL_C",
    "safe_state_transition": "ASIL_C",
}

# Safety Goals Example
safety_goals = [
    {
        "id": "SG-01",
        "description": "防止非预期加速导致碰撞",
        "asil": "ASIL_C",
        "safe_state": "取消ACC，驾驶员接管",
        "ftti": "300ms"
    },
    {
        "id": "SG-02",
        "description": "防止非预期转向导致偏离车道",
        "asil": "ASIL_B",

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