Vehicle Brake Pedal Position Adjustment During Emergency Braking
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Solution Overview
Problem
Existing vehicle brake systems cause uncomfortable feelings for drivers during collision events due to increased reaction forces from the brake pedal during emergency braking operations.
Innovation Solution
A vehicle brake system that includes a brake pedal, a brake fluid pressure generator, a collision determination unit, a braking control unit, and a braking force determination unit, which automatically adjusts the brake pedal position to reduce collision impact while maintaining emergency braking force, by retreating the pedal position in the press-down direction when a collision is detected and the demanded braking force exceeds a predetermined threshold.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If emergency braking control is performed based on collision detection, then collision impact on driver is reduced, but uncomfortable feeling during press-down operation increases
Solution Approach 1:
The brake pedal position is dynamically adjusted based on collision detection. When collision is detected, the brake pedal position is retreated in the press-down direction to reduce reaction force on the driver, while still maintaining emergency braking capability through the braking control unit.
Solution Approach 2:
The system changes the operational parameters of the brake pedal by retreating its position in the press-down direction when collision is detected. This parameter change reduces the reaction force transmitted to the driver's foot while preserving the emergency braking function.
2Object-affected harmful factors
If brake pedal operation position is retreated to reduce reaction force, then collision impact on driver is reduced, but braking force may be insufficient
Solution Approach 1:
The braking control unit acts as an intermediary that decouples the brake pedal position from the actual braking force generation. Even when the pedal position is retreated, the braking control unit can independently generate the required braking force through the brake fluid pressure generator, ensuring both driver comfort and adequate braking performance.
Solution Approach 2:
The system replaces the direct mechanical connection between brake pedal position and braking force with an electronic control system. The braking control unit processes the collision detection signal and independently controls the brake fluid pressure generator, substituting the traditional mechanical force transmission with an electronically controlled hydraulic system.
Data Source
AI summary
A vehicle brake system includes a collision determination unit configured to determine whether collision of the vehicle occurs; a second braking control unit configured to cause at least one of ESB and VSA systems to perform emergency braking control of the vehicle irrespective of a press-down operation of a brake pedal by a driver when collision of the vehicle occurs; and a braking force determination unit configured to determine whether a demanded braking force by emergency braking control exceeds a predetermined braking force threshold. In a case where the collision of the vehicle occurs, and where the demanded braking force exceeds the braking force threshold, the second braking control unit retreats an operation position of the brake pedal in a press-down direction.