Integrated Brake-Suspension Control for Braking Traction
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Solution Overview
Problem
Conventional vehicle braking systems and active suspension systems operate independently, failing to account for combined vehicle dynamics, leading to suboptimal traction and handling, especially in low-friction conditions and during braking events.
Innovation Solution
An integrated vehicle control system that combines a braking system and active suspension system, using processors to adjust wheel contact forces based on reference and forward-looking road information, employing active suspension to modify normal forces and dampen oscillations, and applying twist forces to improve traction and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If braking system and active suspension system operate independently, then system complexity is reduced, but traction and handling performance deteriorates
Solution Approach 1:
The patent combines the braking system and active suspension system into an integrated vehicle control system. The processor receives braking force demands from the braking system and uses this information to control the active suspension system, creating a coordinated approach that improves traction and handling while managing complexity through unified control logic.
Solution Approach 2:
The active suspension system is made multi-functional by enabling it to serve both its traditional role in ride comfort and a new role in enhancing braking performance. The same active suspension actuators that manage vehicle body attitude are also used to optimize wheel contact forces during braking events, allowing one system to perform multiple functions.
2Reliability
If active suspension system adjusts normal forces during braking, then average traction is improved, but device complexity increases
Solution Approach 1:
The active suspension system dynamically adjusts the normal forces on the wheels based on real-time braking conditions. The processor continuously monitors braking force demands and modifies suspension actuator commands accordingly, allowing the system to adapt to changing traction conditions and optimize braking performance throughout the braking event.
Solution Approach 2:
The system implements feedback control by using the braking force demand information as input to the active suspension control algorithm. The processor uses this feedback to determine appropriate adjustments to the normal forces, creating a closed-loop system that responds to actual braking conditions and optimizes traction based on measured performance.
3Stability of the object's composition
If active suspension dampens oscillations during braking, then vehicle stability is improved, but use of energy increases
Solution Approach 1:
The active suspension system applies periodic damping forces to counteract oscillations that occur during braking events. By timing the suspension actuator commands to match the oscillation frequency, the system effectively dampens vehicle body movements and improves stability while minimizing energy consumption through resonant damping rather than continuous force 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
Enhances average traction and stability during braking events by optimizing normal forces and reducing oscillations, improving handling and reducing the risk of rollover and yaw-induced deviations.
Implementation Method 1
the active suspension system is configured to apply active forces to the first wheel and the second wheel
Implementation Method 2
Most braking systems act by applying a retarding torque to one or more of wheels of the vehicle and thus creating longitudinal slip in the tire at the contact point with the ground
Data Source
AI summary
A vehicle control system for a vehicle having a braking system and active suspension system is provided. The vehicle control system may be configured to adjust a normal component of a wheel force at one or more wheels of the vehicle to increase an average traction force at the one or more wheels during a braking event. The vehicle control system may adjust a normal component of a wheel force at one or more wheels based on reference road information, forward-looking road information, and/or vehicle sensor data.