Regenerative Braking Force Control for Low-Speed Nod Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle braking systems experience 'nod/jerking' during low-speed braking, which is difficult to avoid even with optimized powertrain and suspension systems, compromising comfort and safety.
Innovation Solution
A braking control method that utilizes energy regeneration in conjunction with the vehicle braking system to dynamically adjust braking forces, increasing and then decreasing the target braking force to alleviate 'nod/jerking' without increasing braking distance, and incorporating energy regeneration to share the workload of the braking system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional braking systems are used, then braking force is provided, but nod/jerking occurs during low-speed braking
Solution Approach 1:
The braking force is segmented into two distinct components: a first execution braking force provided through energy regeneration and a second execution braking force provided by the traditional braking system. This segmentation allows each component to operate in its optimal range, with the energy regeneration system handling the comfort-critical low-speed phase and the traditional system providing reliable stopping power, thereby eliminating nod/jerking while maintaining braking comfort.
2Use of energy by moving object
If energy regeneration is used for braking, then power consumption is reduced, but braking force control complexity increases
Solution Approach 1:
The control method dynamically adjusts the target braking force based on real-time vehicle speed and required braking force. The system transitions from static braking control to dynamic control where the target braking force is continuously updated, allowing optimal energy recovery while maintaining simple and reliable braking force distribution between the two systems.
3Reliability
If target braking force is increased to avoid collision, then safety is improved, but braking distance increases
Solution Approach 1:
The control method implements a feedback mechanism where the target braking force is determined based on the vehicle speed, required braking force, and a preset comfort braking time. This feedback loop allows the system to calculate and adjust the optimal braking force profile that ensures collision avoidance while minimizing braking distance, preventing both under-braking and excessive braking.
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
Effectively reduces 'nod/jerking' during braking, enhances comfort, reduces power consumption, and minimizes braking distance while ensuring safety by intelligently managing braking forces.
Implementation Method 1
a first execution braking force provided through energy regeneration
Data Source
AI summary
An example braking control method is provided, including: obtaining a vehicle speed and a required braking force of a vehicle; determining a target braking force based on the vehicle speed and the required braking force; and determining a first execution braking force and a second execution braking force based on the target braking force, where the first execution braking force is provided through energy regeneration, and the second execution braking force is provided by a braking system. Further, a related apparatus is provided.