Brake Pressure Precontrol for Faster ABS Intervention
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Solution Overview
Problem
Existing brake systems struggle to rapidly adjust brake slip to an optimal range during quick braking, leading to suboptimal deceleration and potential wheel locking, due to the delay in anti-lock system intervention and uneven weight distribution affecting static friction across vehicle axles.
Innovation Solution
A method for operating a brake system that sets a precontrol value for brake pressure based on admission pressure and vehicle dynamics, using a processing specification to adapt brake pressure gradients and limit the precontrol gradient, allowing for controlled braking force buildup and rapid anti-lock function intervention, thereby maintaining optimal deceleration and preventing wheel locking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the anti-lock system intervenes only after wheel locking is detected, then the system structure remains simple, but the braking response time is delayed and wheel locking cannot be prevented in time
Solution Approach 1:
The system performs preliminary action by calculating and setting a precontrol value for brake pressure before actual braking occurs. This precontrol value is determined based on admission pressure and processing specifications representing vehicle braking dynamics, allowing the system to proactively prevent wheel locking rather than reactively responding after locking is detected.
Solution Approach 2:
The system dynamically adapts the precontrol value based on real-time admission pressure and vehicle-specific processing specifications. The precontrol gradient is limited based on the admission pressure gradient to ensure optimal braking performance while preventing wheel locking, making the system responsive to changing braking conditions.
2Speed
If the brake pressure increases rapidly during quick braking, then the deceleration performance is improved, but the wheel locking risk increases and the anti-lock system cannot intervene in time
Solution Approach 1:
The system calculates a precontrol value that limits the precontrol gradient based on the admission pressure gradient before rapid brake pressure increase occurs. This preliminary limitation prevents the brake pressure from increasing too rapidly, thereby maintaining high deceleration performance while proactively preventing wheel locking.
Solution Approach 2:
The system uses feedback from the admission pressure gradient to dynamically adjust the precontrol gradient limit. By monitoring how rapidly admission pressure is increasing and相应地 limiting the precontrol gradient, the system ensures that brake pressure increases at an optimal rate that maintains deceleration performance while preventing wheel locking.
3Force
If the brake pressure is increased to maximize deceleration, then the braking performance is improved, but the static friction is exceeded and wheel locking occurs
Solution Approach 1:
The system performs preliminary calculation of the precontrol value that accounts for vehicle dynamics and admission pressure characteristics. This precontrol value is set to maximize braking force utilization while staying within the static friction limit, thereby maintaining both high deceleration performance and vehicle steerability.
Solution Approach 2:
The system changes the brake pressure parameter dynamically by limiting the precontrol gradient based on admission pressure gradient. This parameter adjustment ensures that braking force increases at an optimal rate that充分利用 static friction without exceeding it, maintaining both deceleration performance and steerability.
4Speed
If the precontrol gradient is set high to respond quickly to braking demands, then the braking response is improved, but the anti-lock function cannot intervene rapidly enough to prevent wheel locking
Solution Approach 1:
The system dynamically limits the precontrol gradient based on the admission pressure gradient. This dynamic limitation ensures that brake pressure increases rapidly enough to meet braking demands while maintaining a controlled rate that allows the anti-lock function to intervene in time, optimizing both response speed and intervention timing.
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 enables the brake system to maintain maximum deceleration while preventing wheel locking by adapting brake pressure to vehicle dynamics, ensuring rapid and controlled intervention of the anti-lock function, thus optimizing braking performance.
Implementation Method 1
A braking force on a wheel of a vehicle may be greater than a static friction of the wheel on its subsurface
Implementation Method 2
The static friction is influenced by a normal force on the wheel
Implementation Method 3
due to its spring-mounted and damped wheel suspensions and the pneumatic tires, the vehicle is an oscillatory system
Data Source
AI summary
A method for operating a brake system of a vehicle. A precontrol value for a brake pressure of the brake system is set by using an admission pressure value representing a admission pressure in the brake system and a processing specification representing a braking dynamics of the vehicle.