Slope Brake Pressure Estimation for Low-Speed Hill Hold Control

The patent introduces an intermediary computational process that combines multiple measurement sources (vehicle body acceleration sensor, wheel speed sensor, and observer algorithm) to derive the slope estimated value. This intermediary computation filters out fluctuations from individual sensors by integrating data through a unified algorithmic framework, thereby resolving the contradiction between measurement precision and reliability.

The patent transforms the raw acceleration sensor data into a more reliable form by changing the parameter representation through computational processing. The slope estimated value is derived not directly from the acceleration sensor reading but through a transformed parameter that combines multiple sources, thereby improving reliability while maintaining measurement capability.

The patent addresses low-speed inaccuracy by changing the computational parameters used in the observer algorithm. At low speeds, the system adjusts the calculation methodology to account for reduced signal reliability, using alternative parameter relationships that remain accurate across the full speed range, thereby resolving the contradiction between measurement precision and low-speed reliability.

The patent implements dynamic adaptation of the calculation methodology based on operating conditions. The observer algorithm dynamically adjusts its computation strategy based on vehicle speed and other operational parameters, ensuring reliable slope estimation across varying conditions including low-speed scenarios where traditional wheel speed acceleration calculations fail.

The patent creates a universal slope estimation algorithm that serves multiple functions across different working conditions. The unified observer-based approach replaces multiple condition-specific algorithms with a single multi-functional computational framework that automatically adapts to various operating scenarios, thereby maintaining reliability without proportionally increasing complexity.

The patent merges multiple measurement sources and calculation methods into a single integrated observer algorithm. By combining vehicle body acceleration data, wheel speed data, and slope estimation logic into one unified computational system, the patent achieves accurate brake pressure determination across all conditions while avoiding the complexity of managing separate algorithms for different scenarios.