PC-Diffuser: Path-Consistent Capsule CBF Safety Filtering for Diffusion-Based Trajectory Planner

Researchers developed PC-Diffuser, a safety framework for autonomous vehicle trajectory planning that integrates certifiable safety measures directly into diffusion-based planning models. The system addresses safety failures in AI-driven autonomous vehicles by embedding barrier functions into the denoising process rather than applying safety fixes after planning.

• →PC-Diffuser embeds safety measures directly into diffusion-based trajectory planning for autonomous vehicles.
• →The framework uses capsule-distance barrier functions to better reflect vehicle geometry and reduce conservativeness.
• →Safety filtering is applied at every denoising step rather than as a post-processing correction.
• →The system maintains path consistency while ensuring dynamically feasible motion under kinematic constraints.
• →This approach enables iterative, context-aware safety improvements during the planning process.