Vehicle Braking Torque Control for Suspension Rebound Reduction
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Solution Overview
Problem
Vehicle suspension rebound motions upon complete stop cause wear on components and affect passenger ride quality, reducing their longevity.
Innovation Solution
A braking assistance system that monitors vehicle deceleration and wheel slip to reduce braking torque before a complete stop, using control signals to gradually decompress the suspension system and minimize rebound motion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the braking system applies high braking torque to stop the vehicle quickly, then the stopping time is reduced, but the suspension system experiences increased compression and rebound motion
Solution Approach 1:
The control system predicts the complete stop event in advance based on monitored deceleration rate and vehicle state, then proactively reduces braking torque over a time period of two seconds or less prior to the predicted stop. This preliminary action allows the suspension system to gradually decompress before full stop, minimizing rebound motion while maintaining efficient braking performance
2Productivity
If the braking system maintains constant braking torque until complete stop, then the braking efficiency is maximized, but the suspension components experience increased wear and reduced longevity
Solution Approach 1:
The braking torque is dynamically adjusted based on real-time monitoring of vehicle state and deceleration rate. The system maintains high braking torque for efficient stopping, then automatically reduces torque as the vehicle approaches complete stop. This dynamic adjustment optimizes both braking efficiency and component longevity by preventing excessive suspension compression and rebound
3Speed
If the braking system applies maximum braking force to achieve rapid deceleration, then the deceleration rate is increased, but the suspension system experiences excessive compression
Solution Approach 1:
The control system continuously monitors vehicle deceleration rate and compares it against target deceleration criteria. Based on this feedback, the system adjusts braking torque to maintain optimal deceleration while preventing excessive suspension compression. The feedback loop ensures rapid deceleration is achieved without compromising suspension stability
Data Source
AI summary
Systems and methods are provided for braking assistance for a vehicle. The systems include a sensor system, a controller configured to, by one or more processors: receive, from the sensor system, sensor data, detect a braking event of the vehicle, monitor a vehicle state of the vehicle including a deceleration rate of the vehicle, wherein the vehicle state and the deceleration rate is based on the sensor data, process the sensor data to determine whether the vehicle state will trigger activation of an antilock braking system (ABS), and output one or more control signals to command a braking system to reduce a braking torque applied to wheels at a rate sufficient to reduce compression of the front suspension system prior to a complete stop thereof in response to the deceleration rate satisfying a stopping criteria and a determination that the vehicle state will not trigger activation of the ABS.