Brake Blending Control for Vehicle Torque Distribution
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Solution Overview
Problem
Existing brake systems for vehicles lack efficient blending of regenerative and foundation braking, leading to suboptimal braking performance and increased wear on friction brake components.
Innovation Solution
A vehicle brake system comprising a friction brake and a secondary brake, controlled by a controller that applies both brakes simultaneously when the brake torque command is below a threshold, utilizing a brake blending control strategy to optimize braking torque distribution between the friction brake and secondary brake.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If only friction brake is used for braking, then braking simplicity is maintained, but braking power is insufficient and friction brake wear increases
Solution Approach 1:
The patent combines friction brake and secondary brake into a unified brake system that operates together. The controller coordinates both brakes to provide their torques simultaneously, merging their braking capabilities to achieve greater total braking power while managing friction brake wear through optimized torque distribution.
2Power
If friction brake torque is increased to improve braking power, then stopping performance improves, but friction brake wear increases
Solution Approach 1:
The controller dynamically adjusts the torque distribution parameters between friction brake and secondary brake based on operating conditions. By changing the parameter allocation of braking torque, the system optimizes the balance between achieving required braking power and minimizing friction brake wear, extending its service life.
3Duration of action of stationary object
If brake torque distribution is optimized to reduce friction brake wear, then component longevity improves, but braking performance may be compromised
Solution Approach 1:
The controller continuously monitors braking conditions and adjusts torque distribution between friction brake and secondary brake in real-time. This feedback mechanism ensures that friction brake wear is minimized while maintaining adequate braking power, as the system can dynamically compensate for reduced friction brake usage by adjusting secondary brake contribution.
4Duration of action of stationary object
If secondary brake is used to reduce friction brake wear, then component longevity improves, but wheel slip control becomes more challenging
Solution Approach 1:
The controller acts as an intermediary that coordinates the interaction between friction brake and secondary brake. It manages the torque distribution to ensure that while friction brake wear is reduced through secondary brake assistance, the combined braking action maintains proper wheel slip control, balancing both requirements through centralized control.
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 enhances braking power, reduces wheel slip, and minimizes friction brake wear by effectively blending friction and secondary brake torques, providing improved stopping performance and linear brake feel.
Implementation Method 1
The friction brake may be disposed proximate a vehicle wheel and may be configured to provide a friction brake torque to slow rotation of the vehicle wheel
Implementation Method 2
The secondary brake may be configured to provide a secondary brake torque that slows rotation of the vehicle wheel by decreasing torque that may be provided to the vehicle wheel to rotate the vehicle wheel
Data Source
AI summary
A vehicle brake system and a method of control. A friction brake torque and a secondary brake torque may be applied with a friction and secondary brakes, respectively, under various operating conditions, such as when a brake torque command is less than a threshold brake torque command.