Automatic Braking Controller Jerk Reduction Algorithm
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing driver assistance systems for vehicles often result in jerking or jolting during automatic braking maneuvers, which are uncomfortable for occupants and not desirable, as they involve significant changes in deceleration over short durations.
Innovation Solution
An automatic braking system with a controller that determines a braking maneuver by initially applying greater braking force than necessary and then gradually reducing it to zero as the vehicle approaches the target stopping distance, using a predetermined algorithm to smooth the transition from kinetic to static friction and minimize jerk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the brake controller applies braking force to stop the vehicle at the target stopping distance, then the vehicle stops at the desired location, but significant changes in deceleration cause jerk and discomfort to occupants
Solution Approach 1:
The brake controller initially applies a greater braking force than necessary to stop at the target stopping distance, then ramps the braking force back towards zero as the vehicle approaches the target stopping distance. This preliminary application of excessive braking force followed by gradual reduction eliminates jerk and discomfort while achieving precise stopping.
Solution Approach 2:
The system changes the braking force parameter dynamically during the braking maneuver. By transitioning from a constant or linearly decreasing braking force to a ramped reduction towards zero, the system modifies the deceleration profile to minimize jerk while maintaining stopping precision.
2Reliability
If the brake controller applies constant braking force to stop the vehicle, then the stopping distance is controlled, but the abrupt change in deceleration creates jerk
Solution Approach 1:
The brake controller transitions from a static or simple linear braking profile to a dynamic braking profile that adapts the braking force based on the vehicle's approach to the target stopping distance. The braking force is continuously adjusted, ramping back towards zero near the target, creating a smooth and comfortable deceleration curve.
Solution Approach 2:
The controller preemptively applies excessive braking force and then gradually reduces it, rather than maintaining constant force until the last moment. This preliminary action of applying and then reducing force prevents the abrupt deceleration changes that cause jerk.
Data Source
Figure 1
Figure 2~3
AI summary
An automatic braking system for a vehicle is disclosed that includes an electronic brake system capable of applying wheel brakes to decelerate the vehicle and a controller for actuating the brake system in a manner that reduces jerk at the termination of an automatic braking maneuver.