Vehicle Brake Control System with Regenerative Torque Filtering
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Solution Overview
Problem
Conventional vehicle brake control systems experience uncomfortable braking operations due to sudden fluid pressure fluctuations caused by motorized power assist control, which cannot adequately mitigate variations in brake pedal effort during transient changes in regenerative braking torque.
Innovation Solution
A vehicle brake control system that includes a regenerative braking control component, a frictional braking control component, and a calculating component to calculate a regenerative braking torque filter processing value based on the fluctuation frequency of the regenerative braking torque, allowing the system to operate the motorized power assist control device based on this filtered value instead of the raw regenerative braking torque, thereby moderating the frictional braking torque and providing a stable target braking torque.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the motorized power assist control device operates based on the raw regenerative braking torque to compensate for braking torque shortfall, then the braking torque compensation is responsive and effective, but the fluid pressure fluctuation causes variations in brake pedal effort that adversely affect the feel of the braking operation
Solution Approach 1:
A spring element is introduced as an intermediary between the primary piston and the motorized booster piston. This spring absorbs and smooths out fluid pressure fluctuations generated by the motorized power assist control, preventing direct transmission of these fluctuations to the brake pedal. The spring acts as a mechanical filter that maintains braking torque compensation effectiveness while stabilizing brake pedal effort for improved driver comfort
2Ease of operation
If the spring configuration is used to mitigate fluid pressure fluctuation, then the brake pedal effort variation is reduced, but the spring cannot sufficiently compensate for sudden fluid pressure fluctuations during transient changes in regenerative braking torque
Solution Approach 1:
The system dynamically adjusts the characteristics of the spring element based on operating conditions. The spring's stiffness or pre-load can be varied to optimize its damping characteristics during transient changes in regenerative braking torque. This dynamic adjustment allows the spring to effectively absorb sudden pressure fluctuations while maintaining stable brake pedal effort during normal operation, resolving the contradiction between general stability and transient response
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 effectively mitigates variations in brake pedal effort, enhancing the feel of the braking operation by smoothing out sudden changes in regenerative braking torque, resulting in a more comfortable driving experience.
Implementation Method 1
the elastic deformation of the spring prevents the force that accompanies fluid pressure fluctuation from being fully transmitted to the brake pedal
Data Source
AI summary
A vehicle brake control system includes a regenerative braking control component, a frictional braking control component, a calculating component and a controlling component. The regenerative braking control component controls a regenerative braking device to provide a regenerative braking torque. The frictional braking control component controls a frictional braking device to provide a frictional braking torque. The calculating component calculates a regenerative braking torque filter processing value based on a fluctuation frequency of the regenerative braking torque. The controlling component, during a first condition, operates a motorized power assist control device based on the regenerative braking torque filter processing value, instead of the regenerative braking torque, to moderate the frictional braking torque, such that the regenerative braking torque and the moderated frictional braking torque provide a target braking torque based on a braking operation.