1. Why BBW?
Traditional brakes rely on engine-generated vacuum pressure. EVs, lacking engines, face challenges with noisy/space-consuming electric vacuum pumps. BBW replaces mechanical/hydraulic links with motors and electronic signals.
2. Two Key Technologies
① Electro-Hydraulic Brake (EHB)
How it works: Keeps hydraulic system, uses motor to drive hydraulic pump.
Pros:
- Safety redundancy: Falls back to hydraulic braking if fails.
- Mature tech, lower cost, strong braking force (current mainstream).
Cons: Slower response than full-electronic systems.
② Electro-Mechanical Brake (EMB)
How it works: No hydraulics. Motors directly push brake pads.
Pros:
- 30% faster response (vs. hydraulic), lighter weight, precise control.
- Full pedal-decoupling for autonomous driving.
Challenges: Lacks mechanical redundancy; safety standards pending.
3. Core Advantages
- Regenerative Braking: Motors reverse to generate electricity, boosting EV range by 10%-20%.
- Lightweighting: Eliminates hydraulic components.
- Smart Control: Digital pedal signals enable dynamic adjustments (e.g., ABS, stability control).
4. EHB Integration Strategies
| Solution | Features | Status |
| One-Box | ESC & EHB integrated (single ECU) | Lower cost; future trend |
| Two-Box | ESC + EHB as separate systems (dual ECU) | High redundancy; current mainstream |
5. Future Outlook
- Short-term: EHB (especially One-Box) dominates, balancing safety and cost.
- Long-term: EMB is the goal, pending safety redundancy breakthroughs.
- System Synergy: BBW + e-drive enables holistic vehicle energy management.