Vehicle Braking Control Using Pedal Stroke and Simulator Pressure
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Solution Overview
Problem
Existing braking control systems for eco-friendly vehicles limit braking feel tuning and design freedom, as they do not effectively reflect the driver's stepping force in determining the required braking pressure, relying solely on pedal stroke measurements.
Innovation Solution
A braking control apparatus and method that utilize both pedal stroke and pedal simulator pressure sensing units to apply different computation methods across multiple stages, allowing for dynamic adjustment of required braking pressure based on pedal position and pressure, thereby incorporating driver intention into the braking process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the required braking pressure is decided based solely on pedal stroke sensed by the pedal stroke sensor, then the braking control system is simple to implement, but the braking feel tuning and design freedom are limited and the driver's stepping force is not reflected into the formation of the required braking pressure
Solution Approach 1:
The patent combines two sensing approaches (pedal stroke sensing and pedal simulator pressure sensing) into a unified braking control system. The control unit integrates signals from both the pedal stroke sensor and the pedal simulator pressure sensor to determine the required braking pressure, thereby merging the simplicity of stroke-based control with the adaptability of pressure-based feedback to achieve both ease of implementation and braking feel tuning flexibility.
Solution Approach 2:
The braking control system is designed to perform multiple functions: it can operate in a simple stroke-based mode for basic braking control, and simultaneously provide advanced braking feel tuning through pressure feedback. The dual-sensing architecture allows the system to adapt to different braking scenarios and tuning requirements, making it universally applicable across various braking conditions and vehicle types.
2Device complexity
If the required braking pressure is decided based solely on pedal stroke sensed by the pedal stroke sensor, then the control system structure is simple, but the driver's stepping force cannot be reflected into the formation of the required braking pressure
Solution Approach 1:
The patent introduces the pedal simulator pressure sensor as an intermediary element that captures the driver's stepping force information. This sensor acts as a mediator between the driver's input force and the braking pressure generation, translating the physical stepping force into measurable pressure signals that the control unit can use to adjust the required braking pressure accordingly.
3Device complexity
If the required braking pressure is decided based solely on pedal stroke sensed by the pedal stroke sensor, then the system uses fewer sensing units, but the braking feel tuning is limited and design freedom is reduced
Solution Approach 1:
The patent implements a dynamic sensing strategy where the control unit selectively utilizes signals from the pedal stroke sensor and the pedal simulator pressure sensor based on the current braking condition and stage. This dynamic approach allows the system to switch between different sensing modes, optimizing the balance between system complexity and braking feel tuning capability across various operating scenarios.
Data Source
AI summary
A braking control apparatus for a vehicle including: a pedal stroke sensing unit configured to sense a pedal stroke of a brake pedal; a pedal simulator pressure sensing unit configured to sense pressure of a pedal simulator that provides a reaction force in response to a stepping force of the brake pedal; and a control unit configured to apply different computation methods by selectively utilizing a pedal stroke STR sensed by the pedal stroke sensing unit and pedal simulator pressure P_SIM sensed by the pedal simulator pressure sensing unit at a plurality of stages defined while the brake pedal is pressed and released, and decide required braking pressure P which is required for braking the vehicle.