Emergency Braking Pressure Modulation for Vehicle Stability
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Solution Overview
Problem
Existing autonomous braking systems face challenges in efficiently managing hydraulic pressure between the front and rear axles during emergency braking, leading to potential instability and wastage of hydraulic energy due to uncontrolled pressure build-up.
Innovation Solution
A control strategy that differentiates the rate of hydraulic pressure build-up between the front and rear axles, prioritizing faster pressure increase at the front axles and modulating pressure to the rear axles only when necessary, with the ability to redirect hydraulic fluid from the front to the rear axles upon achieving targeted deceleration or wheel slip.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If hydraulic pressure is increased at both front and rear wheel brakes at the same rate during emergency braking, then the braking system can achieve maximum deceleration force, but the vehicle becomes unstable and hydraulic energy is wasted due to uncontrolled pressure build-up
Solution Approach 1:
The patent applies local quality by differentiating the pressure build-up rate between front and rear axles. The front axle receives higher pressure more rapidly than the rear axle during emergency braking, creating non-uniform pressure distribution that matches the vehicle's weight transfer characteristics and maintains stability while achieving maximum deceleration force
2Force
If hydraulic pressure is increased at both front and rear wheel brakes at the same rate, then maximum braking force is achieved, but hydraulic energy is wasted due to pressure overshoot and uncontrolled build-up
Solution Approach 1:
The patent applies dynamics by implementing a dynamic pressure modulation strategy where the pressure build-up rate is continuously adjusted based on real-time vehicle conditions. The system dynamically increases pressure at the front axle faster than at the rear axle, then modulates and redirects pressure based on achieved deceleration levels, preventing pressure overshoot and optimizing hydraulic energy utilization
Solution Approach 2:
The patent applies parameter changes by varying the hydraulic pressure parameters differently for front and rear axles. The system changes the pressure build-up rate parameter, redirecting hydraulic fluid from front to rear axles upon achieving targeted deceleration, thereby optimizing energy efficiency while maintaining braking effectiveness
3Productivity
If hydraulic pressure is increased rapidly at the front axles during emergency braking, then deceleration efficiency is improved, but vehicle stability may be compromised without corresponding rear axle pressure modulation
Solution Approach 1:
The patent applies segmentation by dividing the braking system into distinct front and rear axle control zones with independent pressure modulation. This allows the front axles to receive rapid pressure increase for high deceleration efficiency while the rear axles receive modulated pressure to maintain vehicle stability, preventing instability that would result from uniform pressure application
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances vehicle stability and optimizes hydraulic energy use by preventing pressure overshoot and ensuring efficient brake torque generation, reducing energy wastage and improving deceleration efficiency.
Implementation Method 1
increasing the hydraulic pressure at the first and second front wheel brakes at a greater rate than at the first and second rear wheel brakes
Implementation Method 2
directing hydraulic fluid from the first front wheel brake to the second rear wheel brake
Data Source
AI summary
A method for automatically decelerating a vehicle having a first side with a first front wheel brake (FL) and a first rear wheel brake (RL) and second side with a second front wheel brake (FR) and a second rear wheel brake (RR), and in which the vehicle further has a braking system with pumps (144) operable to deliver a flow of pressurized hydraulic fluid to the first and second front wheel brakes and to the first and second rear wheel brakes, includes receiving a signal associated with an emergency braking event. The method further includes increasing the hydraulic pressure at the first and second front wheel brakes at a greater rate than at the first and second rear wheel brakes. The method also includes directing hydraulic fluid from the first front wheel brake to the second rear wheel brake or, alternatively, increasing the hydraulic pressure at the first and second rear wheel brakes while maintaining hydraulic pressure at the first and second front wheel brakes upon achieving a targeted level of deceleration or wheel slip.